UEZ Gas Fired Unit Heater

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Specifications:

• Model: UEZ
• Unit Type: Gas-Fired Unit Heater
• Installation, Operation, and Maintenance Manual: UEZ-IOM
  (07-24) 1034347-L

Product Information:

Important Safety Information:

WARNING: To prevent damage to the unit or its
internal components, use two wrenches when loosening or tightening
nuts. Do not over tighten!

Condensate Drain Requirements:

CAUTION: DO NOT use copper or copper-based
alloys for condensate drains. The heater is equipped with a
1/2-inch (12.7-mm) PVC pipe for connecting to a condensate drain.
The water condensed from the products of combustion will be
acidic.

Installation Instructions:

1. Refer to the certification and warranty information provided in
   the literature bag.

2. Ensure the heater is mounted according to specified rules for
   best results.

Heater Location and Throw Patterns:

The throw patterns and distances vary based on the unit size and
the angle of the louvers. Refer to Figure 1 and Table 1 for
specific throw distances with standard horizontal louvers.

Mounting Height Requirements:

Mount the heater at the appropriate height to achieve optimal
heating efficiency.

FAQ:

What should I do if I smell gas?

If you smell gas, immediately turn off the unit and any other
appliances, open windows for ventilation, and contact a qualified
technician to inspect the unit.

What type of material should I use for condensate drains?

Avoid using copper or copper-based alloys for condensate drains.
The heater comes with a 1/2-inch PVC pipe for connecting to a
condensate drain.

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Revision: UEZ-IOM (07-24) 1034347-L Supersedes: UEZ-IOM (04-24) 1034347-K
GAS-FIRED UNIT HEATER INSTALLATION, OPERATION, AND MAINTENANCE
MODEL UEZ
DANGER
FIRE OR EXPLOSION HAZARD · Failure to follow safety warnings exactly could result in serious injury, death, or property
damage. · Improper installation, adjustment, alteration, service, or maintenance can cause serious injury,
death, or property damage. · Installation and service must be performed by a qualified installer, service agency, or the
gas supplier. · Be sure to read and understand the installation, operation, and service instructions in this
manual. · Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance. WHAT TO DO IF YOU SMELL GAS
· Do not try to light any appliance. · Do not touch any electrical switch; do not use any phone in your building. · Leave the building immediately. · Immediately call your gas supplier from a phone remote from the building. Follow the gas
supplier’s instructions. · If you cannot reach your gas supplier, call the fire department. DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Important Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Condensate Drain Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Installation Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Heater Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Heater Throw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Mounting Height Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Halogenated Hydrocarbons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VENTING AND COMBUSTION AIR REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Vent/Combustion Air System Piping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Vent/Combustion Air Piping Requirements (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Vent/Combustion Air Piping Requirements (Unit Sizes 130­310) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Vent/Combustion Air System Piping Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Vent/Combustion Piping Joints (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Vent/Combustion Piping Joints (Unit Sizes 130­310) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Vent/Combustion Air System Piping Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Vent/Combustion Piping Support (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Vent/Combustion Piping Support (Unit Sizes 130­310) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Pre-Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Heater Suspension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Suspension of Heater Using Option CK8 or CK10 Hanger Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Heater Suspension Using Field-Supplied Threaded Rods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Suspension of Heater with Downturn Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Gas Supply Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Gas Supply Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Supply Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Vent Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Concentric Adapter Box Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Vent Terminal Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Vertical Vent Terminal (Option CC2) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Horizontal Vent Terminal (Option CC6) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Condensate Drain Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Vent Condensate Drain Installation (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Vent Condensate Drain Installation (Unit Sizes 130­310) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Heat Exchanger Condensate Drain Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

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UEZ-IOM (07-24) 1034347-L

TABLE OF CONTENTS–CONTINUED
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Thermostat Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Combination Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 High Temperature Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Vent Temperature Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Interlock Door Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Circuit Board (DSI Control Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Venter Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Flame Rollout Switch (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Pre-Startup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Operating Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Vent System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Post-Startup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Pressure Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Measure and Adjust Manifold (Outlet) Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Measure and Adjust Manifold Gas Pressure–Elevation 2,000 Feet (610 Meters) . . . . . . . . . . . . . . . . . . 47 Measure and Adjust Manifold Gas Pressure–Elevation

2,000 Feet (>610 Meters) . . . . . . . . . . . . . . . . . . 48 Converting Unit from Natural Gas to Propane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Service Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Burner Maintenance (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Burner Maintenance (Unit Sizes 130­310) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Burner Orifice Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Heat Exchanger Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Ignition System Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Fan and Motor Assembly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Venter Motor and Wheel Assembly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Combination Gas Valve Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Pressure Switch Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 High Temperature Limit Control Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Interlock Door Switch Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Transformer Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Vent Temperature Limit Switch Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Disconnect Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Flame Rollout Switch Maintenance (Unit Sizes 55­110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Vent or Vent/Combustion Air System Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Condensate Drain System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 General Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Unit Troubleshooting Using DSI Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

UEZ-IOM (07-24) 1034347-L

3

GENERAL INFORMATION
· This unit heater has been tested for capacity and efficiency so as to provide many years of safe and dependable comfort providing it is properly installed and maintained . With regular maintenance, this unit will operate satisfactorily year after year . Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create unsafe hazards .
· To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance be performed on this unit . The ability to properly perform maintenance on this equipment requires certain tools and mechanical skills .
· This manual applies only to UEZ models (high-efficiency, separated- combustion, low-static) .
Important Safety Information
Please read all information in this manual thoroughly and become familiar with the capabilities and use of your appliance before attempting to operate or maintain this unit . Pay attention to all dangers, warnings, cautions, and notes highlighted in this manual . Safety markings should not be ignored and are used frequently throughout to designate a degree or level of seriousness . DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe personal injury or death and/or property damage . WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe personal injury and/or property damage . CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor or moderate personal injury and/or property damage . NOTE: A note provides important information that should not be ignored .
WARNING
· Gas-fired appliances are not designed for use in hazardous atmospheres containing flammable vapors or combustible dust, in atmospheres containing chlorinated or halogenated hydrocarbons, or in applications with airborne silicone substances.
· Should overheating occur, or the gas supply control system fail to shut off the flow of gas, shut off the manual gas valve to the unit before shutting off the electrical supply.
· Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and replace any gas control that has been under water.
· Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency installing this heater is responsible for the installation.
· This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
· Children should be supervised to ensure that they do not play with the appliance.
CAUTION
To prevent damage to the unit or to its internal components, it is recommended that two wrenches be used when loosening or tightening nuts. Do not over tighten!
Condensate Drain Requirements
CAUTION
DO NOT use copper or copper-based alloys for condensate drains.
The combustion process forms condensation, which is collected and directed to a drainage point inside the unit . The heater is equipped with a 1/2-inch (12 .7-mm) PVC pipe for connecting to a condensate drain . The water condensed from the products of combustion will be acidic . The level of concentration is dependent upon the environment where the appliance is installed and may be as high as 6 pH .

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UEZ-IOM (07-24) 1034347-L

Certification
· These unit heaters are listed by Intertek for use in industrial and commercial installations in the United States and Canada . In addition, unit sizes 55, 85, and 110 are listed in the United States and Canada as utility heaters for use in non-living spaces that are attached to, adjacent to, or part of a structure that contains space for family living quarters .
· These unit heaters are available for use with either natural or propane gas . The type of gas, the input rate, and the electrical supply requirement are shown on the heater rating plate . Check the rating plate to determine if the heater is appropriate for the intended installation . All heaters are factory- equipped for use with natural gas and include a conversion kit for field- conversion for use with propane .
· These unit heaters have a titanium stabilized primary heat exchanger with a MacroChannel® secondary heat exchanger .
Warranty
Refer to the limited warranty form in the literature bag provided with the unit . The warranty is void if:
· Wiring is not in accordance with the diagram furnished with the heater .
· The unit is installed without proper clearance to combustible materials .
· A fan model is connected to a duct system or if the air delivery system is modified .
Installation Codes
· These units must be installed in accordance with local building codes . In the absence of local codes, in the United States, the unit must be installed in accordance with the National Fuel Gas Code (ANSI Z223 .1, latest edition) . A Canadian installation must be in accordance with the Natural Gas and Propane Installation Code (CSA B149, latest edition) . This code is available from CSA Information Services, 1-800-463-6727 . Local authorities having jurisdiction should be consulted before installation is made to verify local codes and installation procedure requirements .
· Installations in aircraft hangars should be in accordance with the Standard for Aircraft Hangars (ANSI/NFPA No . 409, latest edition) . Installations in public garages should be in accordance with the Standard for Parking Structures (ANSI/NFPA No . 88A, latest edition) . Installations in repair garages should be in accordance with the Standard for Repair Garages (ANSI/NFPA No . 88B, latest edition) . In Canada, installations in aircraft hangars should be in accordance with the requirements of the enforcing authorities, and in public garages, in accordance with the CSA B149 code .
· If the heater is being installed in the Commonwealth of Massachusetts, installation must be performed by a licensed plumber or licensed gas fitter .
Heater Location
CAUTION
· Unit heaters should not be used in an application where the heated space temperature is below 40°F (4°C). The combination of low space and combustion air temperatures may result in condensate freezing in the secondary heat exchanger and/or condensate drain.
· Do not locate the heater where it may be exposed to water spray, rain, or dripping water.
For best results, the heater should be mounted with certain rules in mind:
· Units should always be arranged to blow toward or along exposed wall surfaces, if possible . Where two or more units are installed in the same room, a general scheme of air circulation should be maintained for best results .
· Suspended heaters are most effective when located as close to the working zone as possible, and this fact should be kept in mind when determining the mounting heights to be used . However, care should be exercised to avoid directing the discharged air directly on the room occupants .
· Partitions, columns, counters, or other obstructions should be taken into consideration when locating the unit heater so that a minimum quantity of airflow will be deflected by such obstacles .
· When units are located in the center of the space to be heated, the air should be discharged toward the exposed walls . In large areas, units should be located to discharge air along exposed walls with extra units provided to discharge air in toward the center of the area .

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5

GENERAL INFORMATION–CONTINUED
Heater Location–Continued
Heater Throw
Figure 1 shows throw patterns for fan model units . Table 1 lists throw distances for standard, adjustable horizontal louvers at the angles listed . The louver angles listed are relative to the top of the heater . The throw pattern changes with the addition of optional vertical louvers and/or downturn nozzles .

Z = Distance at which air velocity drops below 50 feet (15.2 meters) per minute
Figure 1. Heater Throw Patterns (Refer to Table 1)

Table 1. Heater Throw Distances with Standard Horizontal Louvers

H*

(Feet

Distance* or Angle

55

(Meters))

Unit Size (MBTUh)

85

110

130

180

260

Feet (Meters)

X

13 (4)

11 (3)

12 (4)

Y

17 (5)

15 (5)

17 (5)

5 (1 .5)

—

Z

37 (11)

44 (13)

49 (15)

Downward louver angle

15°

X

11 (3)

14 (4)

13 (4)

13 (4)

16 (5)

15 (5)

Y

16 (5)

17 (5)

21 (6)

24 (7)

30 (9)

28 (9)

8 (2 .4)

Z

35 (11)

42 (13)

46 (14)

73 (22)

93 (28)

94 (29)

Downward louver angle

27°

22°

26°

20°

24°

X

13 (4)

13 (4)

14 (4)

14 (4)

17 (5)

16 (5)

Y

17 (5)

24 (7)

31 (9)

28 (9)

10 (3 .0)

Z

33 (10)

38 (12)

43 (13)

69 (21)

91 (28)

89 (27)

Downward louver angle

32°

27°

32°

25°

29°

X

16 (5)

14 (4)

18 (6)

17 (5)

Y 12 (3 .7)
Z

19 (6) 35 (11)

17 (5) 41 (12)

24 (7) 64 (20)

31 (9) 88 (27)

28 (9) 85 (26)

Downward louver angle —
X

32°

39°

30°

34°

14 (4)

19 (6)

17 (5)

Y 14 (4 .3)
Z

17 (5) 30 (9)

18 (6) 41 (12)

22 (7) 59 (18)

30 (9) 84 (26)

27 (8) 80 (24)

Downward louver angle

39°

36°

45°

34°

40°

X

13 (4)

19 (6)

17 (5)

Y 16 (4 .9)
Z

20 (6) 53 (16)

29 (9) 79 (24)

25 (8) 74 (23)

Downward louver angle —
X

51° 11 (3)

39° 19 (6)

45° 16 (5)

Y 18 (5 .5)
Z

17 (5) 44 (13)

28 (9) 74 (23)

24 (7) 66 (20)

Downward louver angle

58°

44°

51°

*See Figure 1 .

310
17 (5) 31 (9) 105 (32)
20° 18 (6) 32 (10) 103 (31)
25° 19 (6) 32 (10) 98 (30)
30° 20 (6) 32 (10) 95 (29)
34° 21 (6) 31 (9) 90 (27)
38° 20 (6) 30 (9) 85 (26)
43°

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UEZ-IOM (07-24) 1034347-L

Mounting Height Requirements
WARNING
If touched, the vent pipe and internal heater surfaces that are accessible from outside the heater will cause burns. Suspend the heater a minimum of 5 feet (1.5 meters) above the floor.
In general, a unit should be located 8­12 feet (2 .4­3 .7 meters) above the floor . At those points where infiltration of cold air is excessive, such as at entrance doors and shipping doors, it is desirable to locate the unit so that it will discharge directly toward the source of cold air from a distance of 15­20 feet (4 .6­ 6 .1 meters) .
Halogenated Hydrocarbons
Halogenated hydrocarbons are a family of chemical compounds characterized by the presence of halogen elements (fluorine, chlorine, bromine, etc .) . These compounds are used in refrigerants, cleaning agents, and solvents and are heavier than air, a fact that should be kept in mind when determining the installation location of heaters and building exhaust systems .
CAUTION
CORROSION HAZARD: Halogenated hydrocarbons, when exposed to flame, precipitate with any condensation present in the heater to form hydrochloric acid, which readily attacks all metals, including 300 grade stainless steel. Care should be taken to separate these vapors from the combustion process. An outside air supply MUST BE provided to the burner whenever the presence of these compounds is suspected.

Clearances
Units must be located so that the clearances listed in Table 2 are provided for with regards to combustion air space, inspection, and service and for proper spacing from combustible construction . Clearance to combustibles is defined as the minimum distance from the heater to a surface or object for which it is necessary to ensure that a surface temperature of 90°F (32°C) above the surrounding ambient temperature is not exceeded . Refer to the Dimensions section when determining clearances to combustibles .

Table 2. Clearances

HeaterSurface

Minimum Clearance (Inches (mm))

Top

4 (102)

Flue connector

6 (152)

Access panel

18 (457)

Non-access side

2 (51)

Bottom*

1 (25)

Rear**

18 (457)

Front

Refer to values for variable X (distance from heater to start of floor coverage) in Heater Throw section

*Suspend the heater so that the bottom is a minimum of 5 feet (1 .5 meters) above the floor .

**Measure rear clearance from the fan motor .

Weights
55 85 (39)

85 103 (47)

110 123 (56)

Table 3. Weights
Unit Size (MBTUh) 130
Pounds (kg) 230 (104)

180 245 (111)

260 360 (163)

310 395 (179)

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7

Dimensions
F
E H

GENERAL INFORMATION–CONTINUED

G
TOP VIEW B
D

W

S T
THERMOSTAT CONNECTION
VENT CONNECTION
L

LOW VOLTAGE ENTRANCE
X YZ

DISCONNECT SWITCH
GAS CONNECTION

M N P R

COMBUSTION AIR INLET
CONDENSATE DRAIN
REAR VIEW K
J

A C

FRONT VIEW

RIGHT SIDE VIEW

Figure 2. Dimensions–Unit Sizes 55­110 (Refer to Table 4)

Table 4.

Unit Size (MBTUh)

A

B

55

17-5/8 (448) 28-1/4 (718)

85

21 (533)

30-1/4 (768)

110

24-1/2 (622) 32-1/4 (819)

H*

J

55

85

15 (381)

24-1/4 (616)

110

R

S

55

6 (152)

7-1/4 (184)

85

10-11/16 (271)

110

7-7/8 (200)

14-1/8 (359)

*Heater suspension points (3/8-16 FEM) .

Dimensions (Unit Sizes 55­110)

Dimension (See Figure 2)

C

D

E*

Inches (mm)

12-1/2 (318) 15-7/8 (403)

16-7/8 (429) 17-7/8 (454) 2-27/32 (72)

19-1/4 (489) 18-7/8 (479)

K

L*

M

31 (787)

12 (305)

2 (51)

33 (838)

10-7/8 (276)

1-7/8 (48)

T

W

X

3-1/4 (83) 3-11/16 (94)

3-3/16 (81)

6-1/8 (156) 10-11/16 (271)

7-7/8 (200)

5-1/8 (130)

8-1/8 (206)

8

F*
1-9/16 (40)
N 3-3/16 (81) 5-3/16 (132)
Y 2-1/4 (57) 2-3/4 (70) 3-3/8 (86)

G*
18-1/8 (460) 20-1/8 (511)
P 4-7/8 (124) 6-7/8 (175)
Z
3/4 (19)

UEZ-IOM (07-24) 1034347-L

F

G

E
25 (635)

TOP VIEW
B D

R
5-5/8 (143)
1-9/16 (40)
P

DISCONNECT SWITCH LINE VOLTAGE ENTRANCE
GAS CONNECTION

COMBUSTION AIR INLET
THERMOSTAT CONNECTION
8-3/16 (208)

3-3/16 (81)

N M

CONDENSATE DRAIN

S

VENT CONNECTION

K REAR VIEW

H J

A C

FRONT VIEW

RIGHT SIDE VIEW

Figure 3. Dimensions–Unit Sizes 130­310 (Refer to Table 5)

Table 5. Dimensions (Unit Sizes 130­310)

Unit Size

A

Dimension (See Figure 3)

B

C

D

Inches (mm)

130, 180 260, 310

20-1/8 (511) 34-1/8 (867)

39-3/16 (995) 41 (1041)

16 (406) 30 (762)

23 (584)

F*

G*

H

J

130, 180

2-3/8 (60)

25-11/16 (652)

55-13/32 (1407)

46-1/32 (1169)

260, 310

1-13/32 (36)

27-11/16 (703)

58 (1473)

48-21/32 (1236)

M

N

P

R

130, 180

8-5/16 (211)

4-5/16 (110)

5-1/16 (129)

6-9/32 (160)

260, 310

9-3/32 (231)

5-3/32 (129)

18-13/16 (478)

7-1/32 (179)

*Heater suspension points (3/8-16 FEM) .

E*
11-31/32 (304) 13-31/32 (355)
K 15-19/32 (396) 16-15/32 (418)
S 1-3/4 (45) 1-3/8 (35)

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9

VENTING AND COMBUSTION AIR REQUIREMENTS
NOTE: Refer to the Vent Connections section for details on vent system installation. These units are certified as Category IV heaters . These heaters are very thermal efficient and will produce condensate during operation . Refer to Table 6 for suggested Category IV venting system providers .

Table 6.
IPEX USA LLC Centrotherm ECO Systems
The Schebler Co . Cheminee Lining E Inc .
Selkirk Corporation Z-FLEX US Inc . DuraVent Inc .

Suggested Category IV Venting System Providers

ENERVEX Inc . METAL-FAB Inc . Tokyo Gas Renovation Co . Ltd . Lifetime Chimney Supply LLC Van-Packer Co . Inc .

Industrial Chimney Co . SFL Flue & Chimney Industrial Combustion LLC CaptiveAire Systems
Sunair Products

Security Chimneys International Ltd .

ECCO Manufacturing Division of ECCO Heating Products Ltd .

Vent/Combustion Air System Piping Requirements
DANGER
All separated-combustion units MUST BE equipped with both combustion air and exhaust piping to the outdoors.

Vent/Combustion Air Piping Requirements (Unit Sizes 55­110)

NOTE: Unit sizes 55, 85, and 110 are recommended for use with UL-1738-compliant Category IV venting systems in the US, and with any ULC-S636-listed Category IV venting system in Canada. Venting may be terminated horizontally or vertically, provided that instructions for the selected system are followed.
· Where permitted by local codes, PVC/CPVC pipes meeting ASTM D1785 and/or ASTM F441 designated Schedule 40 are permitted to be used .
· Refer to Table 7 for vent and combustion air piping size requirements .
· The venter outlet and combustion air inlet are located at the rear of the heater (see Figure 4) .

Table 7. Vent/Combustion Air Piping Size Requirements (Unit Sizes 55­110)

Vent Piping

Combustion Air Piping

Unit Size

Diameter (Inches (mm))

Maximum Length

Equivalent Straight Length for Elbows
90-Degree 45-Degree Elbow* Elbow

Pipe Section

Diameter (Inches (mm))

Length (Feet (Meters))

Feet (Meters)

Minimum

Maximum

55, 85 110

2 (51) or 3 (76) 50 (15 .2)

2 (51)

25 (7 .6)

3 (76)

50 (15 .2)

8 (2 .4)

4 (1 .2)

Heater to concentric vent

2 (51) 2 (51) 3 (76)

3 (914) 3 (914) 3 (914)

50 (15 .2) 25 (7 .6) 50 (15 .2)

*All 90-degree elbows in the vent system must be sweep type .

10

UEZ-IOM (07-24) 1034347-L

C
A
TERMINAL STRIP VENT PIPE
LINE VOLTAGE ENTRANCE

COMBUSTION AIR PIPE COLLAR

B

DISCONNECT SWITCH

D

CONDENSATE DRAIN

GAS CONNECTION

Figure 4. Connections at Rear of Unit–Unit Sizes 55­110 (Refer to Table 8)

Table 8.
Dimension (See Figure 4) or Connection
A B C D Combustion air pipe collar PVC vent pipe PVC condensate drain pipe

Connection Sizes and Locations (Unit Sizes 55­110)

Unit Size (MBTUh)

55

85

Dimension/Diameter (Inches (mm))

3-1/4 (83)

3-11/16 (94)

7-1/4 (184)

10-11/16 (271)

3-3/16 (81)

6 (152)

2 (51)

3/4 (19)

110
7-1/8 (181) 14-1/8 (359) 5-1/8 (130) 7-7/8 (200)

Vent/Combustion Air Piping Requirements (Unit Sizes 130­310)

NOTE: Concentric horizontal and vertical vent/combustion air systems (option CC6 or CC2) are the only venting/combustion air systems approved for unit sizes 130, 180, 260, and 310. The unique concentric adapter box required with this heater allows for both combustion air and exhaust piping with only one horizontal or vertical penetration hole in the building.
· Vent pipe: schedule 40 PVC or CPVC pipe or listed venting system of any type (polypropylene, metallic, etc .)–in Canada, all vent pipe must be approved to ULC-636 .
· Vent pipe clearance: do not install the vent piping near any high temperature steam lines, radiant heaters, or other sources of heat .
· Vent piping size requirements: from heater to terminal end of vertical or horizontal vent (refer to Table 9) .
· Combustion air inlet pipe: sealed, single-wall galvanized pipe is recommended .
· Combustion air piping size requirements: from heater to concentric adapter box and from concentric adapter box to outdoors (refer to Table 9) .
· Condensate drain connections: during operation, condensate is produced both in the heater and in the venting system . Therefore, the installation requires a condensate drain from the secondary heat exchanger and from the vent pipe . For safe performance of the heater, each condensate drain must include a trap . Install the condensate drains in accordance with the Condensate Drain Installation section .
· Venter outlet and combustion air inlet: located at rear of heater (see Figure 5) .

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11

VENTING AND COMBUSTION AIR REQUIREMENTS–CONTINUED Vent/Combustion Air System Piping Requirements–Continued
Vent/Combustion Air Piping Requirements (Unit Sizes 130­310)–Continued

Table 9. Vent/Combustion Air Piping Size Requirements (Unit Sizes 130­310)

Vent Piping

Combustion Air Piping

Diameter (Inches (mm))

Maximum Length

Equivalent Straight Length for Elbows

90-Degree 45-Degree

Elbow*

Elbow

Pipe Section

Diameter (Inches (mm))

Length (Feet (Meters))

Feet (Meters)

Minimum

Maximum

4 (102)

50 (15 .2)

8 (2 .4)

4 (1 .2)

Heater to concentric adapter box
Concentric adapter box to outdoors

6 (152) 8 (203)

3 (914)

Same as vent pipe

Refer to Vent Connections section

*All 90-degree elbows in the vent system must be sweep type .

NOTE: The minimum/maximum requirements for the length of vent pipe that extends outdoors are different for horizontal and vertical vent terminals (refer to Vent Connections section) .

DISCONNECT SWITCH

LINE VOLTAGE ENTRANCE

GAS CONNECTION

COMBUSTION AIR PIPE COLLAR

A B

CONDENSATE DRAIN

C

TERMINAL STRIP

D

VENT PIPE

Figure 5. Connections at Rear of Unit–Unit Sizes 130­310 (Refer to Table 10)

Table 10.
Dimension (See Figure 5) or Connection
A B C D Combustion air pipe collar PVC vent pipe PVC condensate drain pipe

Connection Sizes and Locations (Unit Sizes 130­310)

Unit Size (MBTUh)

130, 180

260, 310

Dimension/Diameter (Inches (mm))

8-1/4 (210)

3-1/4 (83)

8-5/16 (211)

9-3/32 (231)

4-5/16 (110)

5-1/16 (129)

6 (153)

4 (102)

1/2 (13)

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UEZ-IOM (07-24) 1034347-L

Vent/Combustion Air System Piping Joints
Vent/Combustion Piping Joints (Unit Sizes 55­110)
All vent/combustion piping joints for unit sizes 55, 85, and 110 must comply with the vent system manufacturer’s requirements .
Vent/Combustion Piping Joints (Unit Sizes 130­310)
NOTE: If using a UL-1738-listed Category IV venting system in the US or a ULC-S636-listed Category IV venting system in Canada, follow the instructions provided for that system.
When ready to install the vent system, ensure that piping joints are in accordance with the following: · Combustion air piping: secure slip-fit joints of single-wall combustion air pipe using sheet metal screws or rivets .
Seal joints and seams with aluminium tape or silicone sealant . · Vent piping: the vent system should be installed in a manner consistent with normal industry standards and in
compliance with all local fire and building code requirements . Failure to follow proper installation practices, procedures, or techniques can result in system failure, property damage, or personal injury . The installer is responsible for the installation . Read the following procedure before beginning installation:
NOTE: Install piping joints one at a time. Pipe and fittings should be assembled quickly while cement is fluid.
1 . Cut pipe square–angled cut may result in joint failure: a . Remove all burrs from inside and outside diameter of cut end of pipe burrs using deburring tool, file, or knife edge . b . Chamfer (bevel) end of pipe 10 to 15 degrees . c . Remove surface dirt, grease, and moisture from pipe sections and fittings using clean dry cloth .
2 . Check for proper fit–test fit using light pressure: a . Install dry pipe one-half to one-third of way into fitting hub . b . Ensure that pipe and fittings are not too tight or too loose .
3 . Apply primer to pipe and fitting surfaces using 2- to 3-inch applicator brush: a . Ensure that primer conforms to ASTM F656 . b . Ensure that primer does not puddle inside system .
4 . Apply cement using 2- to 3-inch applicator brush, quickly assembling joint while cement is fluid: a . Ensure that cement conforms to ASTM D2564 . b . Apply full even layer of cement to pipe OD slightly greater than depth of socket on coupler (fitting) . c . Coat coupler (fitting) socket with medium layer of cement, ensuring that cement does not puddle inside system . d . Apply second full even layer of cement to pipe OD .
5 . Join pipe and coupler (fitting): a . Working quickly while cement is fluid, insert pipe into coupler (fitting) until it touches socket bottom . a . Turn pipe quarter turn and hold joint together until pipe will not pull out . b . Clean excessive cement from exterior–properly made joint will have continuous bead of cement around perimeter .

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13

VENTING AND COMBUSTION AIR REQUIREMENTS–CONTINUED

Vent/Combustion Air System Piping Support

Vent/Combustion Piping Support (Unit Sizes 55­110)
All vent/combustion piping supports for unit sizes 55, 85, and 110 must comply with the vent system manufacturer’s requirements .
Vent/Combustion Piping Support (Unit Sizes 130­310)
CAUTION
DO NOT use the heater or concentric adapter box to provide vent pipe support.

· Vent pipe support: for continued safe operation, the vent system must be properly supported . A 10-foot (3-meter) length of PVC pipe weighs 20 pounds (9 kg) and has an expansion rate of four times that of metal pipe .
· Horizontal CPVC or PVC vent: must be supported every 6 feet (1 .8 meters) . The hangers should provide as much bearing surface as possible and must be free of sharp edges and burrs . Hangers must allow the pipe to expand laterally . Consider pipe expansion when placing hangers . Changes in pipe direction will allow for expansion . Hangers must be placed to allow for some direction movement . The slip joint at the concentric adapter box is designed to permit some limited expansion .
· Vertical CPVC or PVC vent: it is recommended that an engineer design the vertical support system . An acceptable field-supplied cradle-type support that allows for expansion for a simple vertical vent that is 30 feet (9 .1 meters) or less and rises closely from the heater is shown in Figure 6 .

UNIT

3/8-inch threaded rod attached to building structural member
Vertical single-wall combustion air pipe may be supported by heater and concentric adapter box

Vertical Vent

Cradle Support

Slope horizontal run downward slightly toward vent condensate drain at heater

Sweep-type elbow only

3 to 6 inches (76 to 152 mm)

Maximum length 6 feet (1.8 M) for single support
Figure 6. Vent Pipe Support
· Combustion air pipe support: support a single-wall metal horizontal combustion air run every 6 feet (1 .8 meters) . Support a vertical single-wall metal combustion air pipe in accordance with accepted industry practices . The heater and concentric adapter box may be used to support a vertical combustion air pipe .
· This unit heater is a high-efficiency appliance designed to extract part of the latent heat from the products of combustion .

14

UEZ-IOM (07-24) 1034347-L

INSTALLATION
Unpacking and Inspection
· The unit was test-operated and inspected at the factory prior to crating and was in operating condition . · It is important to note when uncrating the unit that shipping brackets are attached with cabinet screws . When
removing shipping brackets, re-insert ALL screws into the cabinet . · If, upon removing it from its crate, the unit has been found to have incurred any damage in shipment, document
the damage with the transporting agency and contact an authorized Factory Distributor . If you are an authorized Distributor, follow the FOB freight policy procedures . · A conversion kit is included with the heater for converting for use with propane (refer to Converting Unit from Natural Gas to Propane section) .
Pre-Installation Checklist
Check the rating plate for the gas specifications and electrical characteristics of the heater to ensure that they are compatible with the gas and electric supplies at the installation site .
Read this manual and become familiar with the installation requirements of your particular heater . If you do not have knowledge of local requirements, check with the local gas company or any other local agencies
who might have requirements concerning this installation . Before beginning, make preparations for necessary supplies, tools, and manpower . Check to see if there are any field-installed options (refer to Table 11) that need to be assembled/installed
prior to unit installation . Ensure that all options ordered are at the installation site .

Option CC2 CC6 CC18 CC19 CC20 CC22 CC23 CC24 CC25 CD1 CD2 CD3 CD4 CE1 CG1 CG4 CG5 CK8 CK10 CL1
CL31, CL32
CM1

Table 11. Field-Installed Options
Description Vertical vent terminal/combustion air kit Horizontal vent terminal/combustion air kit Universal vent terminal assembly, 2-inch diameter × 40 inches long Horizontal vent terminal assembly, 3-inch diameter × 20 inches long Universal vent terminal assembly, 3-inch diameter × 44 inches long Low profile horizontal vent terminal assembly, 2-inch diameter Low profile horizontal vent terminal assembly, 3-inch diameter Horizontal vent terminal assembly, 2-inch diameter × 16 inches long Universal vent terminal assembly, 2- or 3-inch diameter × 24 inches long Vertical louvers, direct discharge air to provide wider throw pattern Downturn nozzle, 25- to 65-degree variable air deflection range Downturn nozzle, 50- to 90-degree variable air deflection range Downturn nozzle, 25- to 65-degree variable air deflection range with vertical louvers Manual shutoff valve, natural gas or propane 208V­115V stepdown transformer 230V­115V or 460V­115V stepdown transformer 575V­115V stepdown transformer Adapts 3/8-inch hangers for two-point suspension from 1-inch threaded pipe Adapts 3/8-inch hangers for four-point suspension from 1-inch threaded pipe Single-stage thermostat Multiple unit control: option CL31 includes components for one control unit and one additional unit– option CL32 includes components for each additional non-control unit Locking cover for CL1 thermostat

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15

INSTALLATION–CONTINUED Heater Suspension
WARNING
· Before suspending the heater, check the supporting structure to be used to verify that it has sufficient load-carrying capacity to support the weight (refer to Weights section) of the unit.
· The heater must be level for proper operation. DO NOT place or add additional weight to a suspended heater.
CAUTION
· Before lifting the heater, verify that any screws used for holding shipping brackets were reinstalled in the cabinet.
· Before lifting the heater, any unused suspension points MUST be plugged. Seal any unused holes in the top of the heater after installing the hanging hardware using capscrews and washers.
· When the heater is lifted for suspension, support the bottom of the heater with plywood or other appropriately placed material. If the bottom is not supported, damage could occur.
NOTE: Four-point suspension is recommended. Two-point suspension is permitted only on unit sizes 55­110 when installed without a downturn nozzle. A 3/8-16 threaded nut retainer is located at each suspension point . The heater may be suspended using either 3/8inch threaded rods or a hanger kit option package . Suspension of Heater Using Option CK8 or CK10 Hanger Kit Options CK8 (two- point suspension, unit sizes 55­110) and CK10 (four-point suspension) are for suspending the heater using swivel connectors connected to 1-inch pipe . Attach the swivel connectors at the 3/8-16 threaded nut retainers . Ensure that the swivel connectors are locked to the heater as shown in Figure 7 .
Figure 7. Option CK8 or CK10 Hanger Kit

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UEZ-IOM (07-24) 1034347-L

Heater Suspension Using Field-Supplied Threaded Rods
The heater may be suspended from 3/8-inch threaded rods using either two- (unit sizes 55­110) or four-point suspension . The recommended maximum rod length is 6 feet (1 .8 meters) . The length of the threaded rod extending into the heater MUST NOT exceed 1/2 inch (13 mm) . Ensure that the threaded rods are locked to the heater as shown in Figure 8 .

ADD 3/8-INCH NUT AND WASHER TO LOCK ROD TO HEATER

3/8-INCH THREADED ROD

Figure 8. Heater Suspension Using Field-Supplied Threaded Rods
Suspension of Heater with Downturn Nozzle
Ensure that any unit with a downturn nozzle (option CD2, CD3, or CD4) is installed using one of the above FOURPOINT suspension methods . Follow the instructions provided with the downturn nozzle kit .
Piping Connections
Gas Supply Pressure
· The unit is equipped for a maximum gas supply pressure of 1/2 psi, 3 .5 kPa, or 14 IN WC for natural gas or propane . The minimum supply pressure, as measured while the unit is operating at full fire, is 5 IN WC for natural gas or 11 IN WC for propane .
· Supply pressure higher than 1/2 psi requires the installation of an additional service regulator external to the unit . · Pressure testing supply piping: For test pressures above 1/2 psi, disconnect the heater and manual valve from
the gas supply line to be tested and cap or plug the supply line . For test pressures below 1/2 psi, before testing, close the manual valve on the heater .

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17

INSTALLATION–CONTINUED
Piping Connections–Continued
Gas Supply Piping
DANGER
· All components of a gas supply system must be leak tested prior to placing equipment in service. NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal injury, property damage, or death.
· Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical constituents of the gas being supplied.
· All piping must be in accordance with requirements outlined in the National Fuel Gas Code (ANSI/Z223 .1, latest edition) or the Natural Gas and Propane Installation Code (CSA-B149 .1, latest edition) .
· Gas supply piping installation shall conform with good practice and with local codes . · Support gas piping with pipe hangers, metal strapping, or other suitable material . Do not rely on the heater to
support the gas pipe . · The heater is orificed for operation with natural gas having a heating value of 1,000 (±50) BTU per cubic foot or
with propane gas having a heating value of 2,500 (±100) BTU per cubic foot . Sizing of gas supply lines depends on piping capacity and is based on cubic feet per hour based on a 0 .3 IN WC pressure drop, a 0 .6 specific gravity for natural gas at 1,000 BTU per cubic feet, and a 1 .6 specific gravity for propane at 2,550 BTU per cubic feet . If the gas at the installation does not meet this specification, consult the factory for proper orificing . · Variables for sizing gas supply lines are listed in Table 12 . When sizing supply lines, consider the possibility of future expansion and increased requirements (refer to the National Fuel Gas Code for additional information) .

Table 12. Gas Supply Line Sizes

Natural Gas

Pipe

Length

(Feet)

1/2

3/4

Pipe Diameter (Inches)

1

1-1/4 1-1/2

2

1/2

3/4

Cubic Feet per Hour

Propane

1

1-1/4

1-1/2

2

20

92

190

350

730 1100 2100

56

116

214

445

671

1281

30

73

152

285

590

890 1650

45

93

174

360

543

1007

40

63

130

245

500

760 1450

38

79

149

305

464

885

50

56

115

215

440

670 1270

34

70

131

268

409

775

60

50

105

195

400

610 1105

31

64

119

244

372

674

70

46

96

180

370

560 1050

28

59

110

226

342

641

80

43

90

170

350

530

990

26

55

104

214

323

604

90

40

84

160

320

490

930

24

51

98

195

299

567

100

38

79

150

305

460

870

23

48

92

186

281

531

125

34

72

130

275

410

780

21

44

79

168

250

476

150

31

64

120

250

380

710

19

39

73

153

232

433

175

28

59

110

225

350

650

17

36

67

137

214

397

200

26

55

100

210

320

610

16

34

61

128

195

372

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UEZ-IOM (07-24) 1034347-L

Supply Piping Connections
· Install a ground joint union and manual shutoff valve upstream of the unit control system, as shown in Figure 9 .
· The 1/8-inch plugged tapping in the manual shutoff valve in Figure 9 provides connection for a supply line pressure test gauge .
· The National Fuel Gas Code requires the installation of a trap with a minimum 3-inch drip leg (see Figure 9) . Local codes may require a drip leg longer than 3 inches (typically 6 inches) . To permit burner removal, this drip leg must extend beyond the edge of the heater .
· Leak-test all connections by brushing on a leak-detecting solution . Bleed trapped air from gas lines as needed .
· The gas connection is made at the pipe nipple that extends outside the cabinet, as shown in Figure 9 . Gas connection sizes are listed in Table 13 .

Figure 9. Gas Connections

Table 13. Gas Connection Sizes

Unit Size (MBTUh)

Natural Gas

Connection (Inches)*

130, 180

1/2

260, 310

3/4

*Connection size for a standard unit (not gas supply line size) .

Propane
1/2 3/4

Vent Connections
NOTE: IMPORTANT: For unit sizes 55, 85, and 110, install the venting system in accordance with the venting system manufacturer’s instructions. For unit sizes 130, 180, 260, and 310, install the venting system in accordance with the following paragraphs.

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INSTALLATION–CONTINUED Vent Connections–Continued
Concentric Adapter Box Connections · The concentric adapter box is included in the vent/combustion air kit, which is ordered with the heater . · A horizontal terminal vent/combustion air kit is option CC6; a vertical terminal vent/combustion air kit is option CC2 .
The concentric adapter box is included in both the horizontal and vertical vent/combustion air kits . Installation is included in the instructions for options CC6 and CC2 . · The concentric adapter box is shown Figure 10 . Dimensions and connections are shown in Figure 11 .
HEATER SIDE VIEW
There is silicone ring around this opening in box. Loosen screws on pipe support bracket. Adjust bracket to provide good seal with ring and tighten screws. Figure 10. Concentric Adapter Box

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1-7/8″ (48mm)

Top View

6-3/16″ (157mm)

8″ diameter Collar for Combustion Air Pipe

2″ (51mm)

Heater Side View

4-3/32″ (104mm)

14-3/8″ (365mm)

5-9/32″ (134mm)

9-11/32″ (237mm)
5-11/23″ (136mm)

6″ diameter Collar for Combustion Air Pipe
6″ diameter Collar for Combustion Air Pipe

Silicone Ring
Opening for 4″ diameter Vent Pipe 16″ (406mm) 17″ (432mm)

6-1/8″ (156mm)
6-1/8″ (156mm)
1-1/16″ (27mm)

Figure 11. Concentric Adapter Box Dimensions and Connections

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21

INSTALLATION–CONTINUED Vent Connections–Continued
Vent Terminal Options Vent terminal options CC2 (vertical vent configuration) and CC6 (horizontal vent configuration) are shown in Figure 12 .

VERTICAL (OPTION CC2)

HORIZONTAL (OPTION CC6)

Figure 12. Vent Terminal Options
Vertical Vent Terminal (Option CC2) Installation
· Field-supplied components required for installation of the vertical vent kit are as follows: a . Vent and combustion air piping: 6- and 8-inch single-wall galvanized pipe b . Tapered vent pipe diameter reducers and/or increasers, as required c . Thimble (not required if wall is of non-combustible construction) d . Flashing e . Sheet metal screws, tape, and sealant, as required
· Factory-supplied components for installation of the vertical vent kit are listed in Table 14 and shown in Figure 13 .

Table 14.
PN 221248 221069 221185 221250 221091 221215 37661

Vertical Vent Terminal/Combustion Air Package (Option CC2) Components

Description

Quantity

Kit package

1

Concentric adapter box with silicone sealing ring (see Figure 10 and Figure 11)

1

Rain collar (see Figure 13)

1

Combustion air inlet (see Figure 13)

1

Cap, condensate drain connection, 4-inch PVC

1

Bird guard (see Figure 13)

1

Screw, self-drilling, #10-16 × 1/2, bird guard

2

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UEZ-IOM (07-24) 1034347-L

RAIN COLLAR

COMBUSTION AIR INLET

BIRD GUARD

Figure 13. Option CC2 Components
· Install the vertical vent kit as follows:
DANGER
To prevent combustion products from entering the occupied space, all vent terminals must be positioned or located away from fresh air intakes, doors, and windows. Failure to comply could result in severe personal injury or death and/or property damage.
1 . Determine vent terminal location on outside wall: a . If more than one vertical vent terminal is being installed, minimum spacing between vent center lines is determined by minimum outdoor design temperature (coldest outdoor condition at installation site) . Refer to Table 15 to ensure that location complies with minimum outdoor design temperature requirements .

Table 15. Minimum Spacing Between Center Lines of Vertical Vent Pipes

Minimum Outdoor Design Temperature

Minimum Spacing Between Center Lines of Vertical Vent Pipes (Inches (mm))

31°F (0°C)

36 (914)

-10 to 30°F (-23 to -1°C)

60 (1524)

< -10°F (< -23°C)

84 (2134)

b . Select location away from fresh air intakes, allowing space for concentric adapter box inside . Vent terminal must be located away from adjacent buildings as shown in Figure 14 .
2 . Install vent pipe and combustion air pipe runs:
a . Connect piping to heater in accordance with specifications listed in Vent/Combustion Air System Piping Requirements section .
b . Seal all joints in accordance with specifications listed in Vent/Combustion Air System Piping Joints section. Due to high temperature considerations, do not enclose exhaust pipe or place pipe closer than 6 inches (152 mm) to combustible material .
c . Extend piping runs close to roof at location selected in step 1 and support piping in accordance with specifications listed in Vent/Combustion Air System Piping Support section .
NOTE: The vent pipe will extend through the roof after the concentric adapter box is installed. The indoor combustion air pipe will end at the box.
3 . Cut hole through outside wall for combustion air pipe .
a . Ensure that location and orientation of concentric adapter box are correct and mark and cut hole .
b . Ensure that hole accommodates 8-inch (203-mm) combustion air pipe .

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23

INSTALLATION–CONTINUED Vent Connections–Continued
Vertical Vent Terminal (Option CC2) Installation–Continued

Rear View

Side View

Figure 14. Option CC2 Installation
4 . Connect combustion air pipe to concentric adapter box (see Figure 15):
a . Determine length of combustion air pipe so that dimension X in Figure 15 is equal to roof thickness plus anticipated snow depth . Ensure that length of combustion air pipe does not exceed 48 inches (1,219 mm) or does not extend less than 18 inches (457 mm) above roof .
b . Secure inlet air pipe to collar of concentric adapter box using sheet metal screws . Seal joint and seam using tape or sealant .
5 . Secure concentric adapter box to underside of roof (see Figure 14):
a . Insert combustion air pipe through roof as shown in Figure 15, DETAIL A .
b . Position concentric adapter box to match pipe runs and secure box to underside of roof using field-supplied hardware .

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UEZ-IOM (07-24) 1034347-L

DETAIL A

Figure 15. Combustion Air Pipe Installation
6 . Install terminal-end vent pipe:
NOTE: The length of the terminal-end vent pipe is determined by the installation within maximum and minimum requirements. The vent pipe extending through the box, through the combustion air inlet pipe, and above the combustion air inlet air pipe must be one piece without joints.
a . Refer to Figure 15 to determine required length of continuous section of vent pipe . Determine length as follows: 1) start with at least 6 inches (152 mm) below concentric adapter box for connecting to coupler, 2) plus 6 inches (152 mm) through box, 3) plus length of combustion air pipe, 4) plus minimum of 23 inches (584 mm) beyond top of combustion air pipe–total is minimum length of vent pipe section .
NOTE: A longer vent pipe may be required.
b . Ensure that vent pipe is in proper flow direction and slide end of pipe into box and out through combustion air pipe . Position vent pipe to lengths determined above .
c . Ensure that silicone ring is seated properly and connect terminal vent pipe to vent pipe run . d . Recheck silicone ring to ensure that it is still properly seated . 7 . Install indoor combustion air pipe: a . Secure single- wall combustion air pipe run to collar on concentric adapter box using field- supplied sheet metal
screws . b . Seal pipe joint using tape or sealant .

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INSTALLATION–CONTINUED Vent Connections–Continued
Vertical Vent Terminal (Option CC2) Installation–Continued 8 . Install outdoor combustion air inlet, rain collar, bird screen, and field-supplied flashing (see Figure 16):
a . Slide combustion air inlet over vent pipe and secure collar to combustion air pipe using sheet metal screws . b . Seal pipe joint using tape or sealant . c . To prevent rainwater leakage, slide rain collar over end of 4-inch vent pipe and seat it flush on top of combustion
air inlet . Do not paint or use petroleum-based products on rain collar (silicone sealant is allowed) . d . Install bird guard and secure using two sheet metal screws provided . e . Flash combustion air pipe on outside using field-supplied flashing .
BIRD GUARD
RAIN COLLAR
COMBUSTION AIR INLET
Figure 16. Combustion Air Inlet, Rain Collar, and Bird Guard 9 . Verify compliance with Figure 14 and with all specifications listed in VENTING AND COMBUSTION AIR
REQUIREMENTS and Halogenated Hydrocarbons sections . Horizontal Vent Terminal (Option CC6) Installation · Field-supplied components required for installation of the horizontal vent kit are as follows:
a . Vent and combustion air piping: 6- and 8-inch single-wall galvanized pipe b . 22 .5-degree elbow (if available) c . Flashing d . Sheet metal screws, tape, and sealant, as required · Factory-supplied components for installation of the horizontal vent kit are listed in Table 16 and shown in Figure 17 .

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UEZ-IOM (07-24) 1034347-L

Table 16.
PN 221247 221069 221089 124940 221186 37661 221091

Horizontal Vent Terminal/Combustion Air Package (Option CC6) Components

Description

Quantity

Kit package

1

Concentric adapter box with silicone sealing ring (see Figure 10 and Figure 11)

1

Bird screen, exhaust outlet (see Figure 17)

1

Ring guard, air inlet (see Figure 17)

1

Spacer, inlet air guard

4

Screw, self-drilling, #10-16 × 1/2, inlet air guard

4

Cap, condensate drain connection, 4-inch PVC

1

BIRD SCREEN

RING GUARD

Figure 17. Option CC6 Components
· Install the horizontal vent kit as follows:
DANGER
· To prevent combustion products from entering the occupied space, all vent terminals must be positioned or located away from fresh air intakes, doors, and windows. Failure to comply could result in severe personal injury or death and/or property damage.
· In climates with below freezing temperatures, condensate may form icicles on the vent terminal. Locate the terminal where falling icicles do not present a hazard.
· Consider local snow depth conditions. The vent must be at least 6 inches (152 mm) above the anticipated snow depth.
1 . Determine vent/combustion air terminal location on outside wall: a . Refer to Table 7 and Table 8 or Table 9 and Table 10 to ensure that location complies with vent length requirements . b . For most applications, ensure that vent terminal is level with heater mounting height . c . Allow downward pitch of 1/4-inch per foot (6 mm per 305 mm) for condensate drain .
NOTE: Local codes supersede all provisions in these instructions and in the National Fuel Gas Code (ANSI Z223.1).
WARNING
Avoid positioning the vent terminal above a walkway as there may be a small amount of condensate that drips from the end of the vent/combustion air terminal. In cold climates, the condensate may form icicles.
d . Ensure that distance of vent terminal from adjacent public walkways and buildings and window and building openings complies with local codes . Absent any local codes, distance must comply with National Fuel Gas Code (ANSI Z223 .1) .

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27

INSTALLATION–CONTINUED
Vent Connections–Continued
Horizontal Vent Terminal (Option CC6) Installation–Continued
CAUTION
Products of combustion can cause discoloration of some building finishes and deterioration of masonry materials. A clear silicone sealant normally used to protect concrete driveways may be used to protect masonry materials from discoloration and deterioration. If discoloration is an esthetic problem relocate the vent or install a vertical vent.

e . Refer to Table 17 to ensure that location complies with minimum clearance requirements .

Table 17. Minimum Clearance Requirements for Horizontal Vent Termination Location

Component/Structure

Minimum Clearance, All Directions Unless Specified (Feet (Meters))

Forced air inlet within 10 feet (3 .1 meters)*

3 (0 .9) above

Combustion air inlet of another appliance

6 (1 .8)

Mechanical air supply inlet to any building

Canada: 6 (1 .8)

Any building opening (door, window, or gravity air inlet)

4 (1 .2) horizontal and below 1 (0 .3) above

Gas meter,** electric meter, and relief equipment

US: 4 (1 .2) horizontal Canada: 6 (1 .8) horizontal

Gas regulator**

US: 3 (0 .9) horizontal Canada: 6 (1 .8) horizontal

Adjoining building or parapet

6 (1 .8)

Adjacent public walkway

7 (2 .1) above

Grade (ground level)

3 (0 .9) above

*Does not apply to the inlet of a direct vent appliance .

**Do not terminate the vent directly above a gas meter or service regulator .

2 . Install vent pipe and combustion air pipe runs: a . Connect piping to heater in accordance with specifications listed in Vent/Combustion Air System Piping Requirements section . b . Seal all joints in accordance with specifications listed in Vent/Combustion Air System Piping Joints section. Due to high temperature considerations, do not enclose exhaust pipe or place pipe closer than 6 inches (152 mm) to combustible material . c . Extend piping runs close to wall at location selected in step 1 and support piping in accordance with specifications listed in Vent/Combustion Air System Piping Support section .
NOTE: The vent pipe will extend through the wall after the concentric adapter box is installed. The indoor combustion air pipe will end at the concentric adapter box.
3 . Cut hole through outside wall for combustion air pipe . a . Ensure that outside wall construction thickness is between 1 inch (25 mm) minimum and 48 inches (1,219 mm) maximum . b . Ensure that hole accommodates 8-inch (203-mm) combustion air pipe .
4 . Connect concentric adapter box (see Figure 18): a . Determine length of combustion air pipe by measuring wall thickness plus 4­16 inches (102­406 mm) beyond minus width of pipe crimp that will be cut off . b . Cut crimp off end of combustion air pipe so that 8-inch inlet air guard will fit properly . c . Turn combustion air pipe so that is toward top side of concentric adapter box and slide it on collar . d . Secure combustion air pipe to collar using sheet metal screws and seal joint and seam using sealant or tape .

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UEZ-IOM (07-24) 1034347-L

Unit

X

Y

Size feet meters inches mm

130, 180 8 2.4

36 914

260, 310 10 3.0

48 1219

**Minimum: check for and comply with local codes.

Figure 18. Option CC6 Installation
5 . Drill drain hole: a . Mark location on bottom side of pipe that will be outside between end of pipe and building–about 2/3 of distance from end of pipe to edge of building–when concentric adapter box is installed . b . Drill 1/2-inch diameter drain hole at location marked in step 5a .
6 . Install air inlet ring guard: a . Position inlet air ring guard over end of combustion air pipe in accordance with Figure 18 . b . Secure inlet air ring guard to inlet air pipe using four 1/2-inch-long screws provided .

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29

INSTALLATION–CONTINUED
Vent Connections–Continued
Horizontal Vent Terminal (Option CC6) Installation–Continued 7 . Secure concentric adapter box to the wall:
a . Insert combustion air pipe with inlet guard attached out through wall . b . Position concentric adapter box so that pipe is centered in opening and secure box brackets to wall using
field-supplied hardware . 8 . Install terminal-end vent pipe:
NOTE: The length of the continuous piece of terminal-end vent pipe is determined by the installation within maximum and minimum requirements. The vent pipe extending through the box and through the combustion air inlet pipe must be one piece without joints.
a . Refer to Figure 18 to determine lengths of each pipe segment and to calculate total length required . b . Ensure that terminal-end vent pipe is in proper flow direction and temporarily fit elbow pointing down on exhaust
end of vent pipe .
NOTE: For easier future service, the elbow is secured to the vent pipe using one field-provided 3/4-inch-long sheet metal screw.
c . Drill hole through top center of elbow socket and vent pipe using drill bit one size smaller than 3/4-inch-long sheet metal screw . Remove elbow and enlarge drilled hole in elbow to 7/32 inch .
d . Turn vent pipe so that drilled hole is at top and slide end of pipe out through concentric adapter box and combustion air pipe .
e . Position vent pipe so that it extends 3­6 inches (76­152 mm) past end of combustion air pipe . Turn pipe so that screw hole is in top center .
f . Ensure that silicone sealing ring on concentric adapter box is properly seated . Do not add sealant to ring . g . Connect terminal-end vent pipe to vent pipe run and recheck sealing ring to ensure that it is still properly seated . 9 . Install indoor section of combustion air pipe: a . Secure single- wall combustion air pipe run to collar on concentric adapter box using sheet metal screws . b . Seal pipe joint using tape or sealant . 10 . Install inlet air guard spacers, elbow, and bird screen on outdoor section of combustion air pipe: a . Remove inlet air ring guard screws installed in step 6b . Slide spacers onto ends of four spokes that support
vent pipe . Re-install guard and secure using screws . b . Slide elbow pointing down on end of pipe, align hole drilled in step 8c, and secure elbow using field-supplied
3/4-inch-long sheet metal screw . c . Insert bird screen into socket on open end of elbow . 11 . Seal or flash around combustion air pipe: a . Seal around combustion air pipe using an outdoor caulking material, masonry cement, or combination of
flashing and caulking . b . Adjust sealant and pipe so that pipe has slight downward slope to outside . Downward slope and drain hole
drilled in step 5b prevents rain water from running through pipe into concentric adapter box . 12 . Verify compliance with Figure 18 and with all specifications listed in VENTING AND COMBUSTION AIR
REQUIREMENTS and Halogenated Hydrocarbons sections .

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Condensate Drain Installation
CAUTION
Apply general plumbing practices if pipe insulation or heat tapes are required to prevent freezing of the condensate drain system.
· Because condensate is produced both in the heater and in the venting system, the installation requires a condensate drain from the vent pipe and from the secondary heat exchanger .
· Condensate from the heater has a pH of 6 and is not harmful to a sanitary drain . Actual pH may vary ±1 depending on fuel and combustion air .
· Unit sizes 55, 85, and 110 produce approximately 1/2 gallon (2 liters) of condensate per hour . Unit sizes 130 and 180 produce approximately 1 gallon (4 liters) of condensate per hour . Unit sizes 260 and 310 produce approximately 2 gallons (8 liters) of condensate per hour .
· A condensate disposal system that relies on gravity should be satisfactory for most installations as unit heaters are normally installed several feet above the floor . If a gravity system is not possible, a condensate pump may be installed . There are a number of commercially-available pumps made for this purpose . If using a condensate pump, follow the pump manufacturer’s installation recommendations .
· The orientation of the piping is not critical and may be arranged to suit the installation . Unions are recommended to permit maintenance of the drains and to facilitate service of the heater . A union is shown in both of the traps and a third union is recommended in the drain pipe . If pipe insulation or heat tapes are required to prevent freezing, use should be in accordance with general accepted plumbing practices .
· Each condensate drain must include a drain trap . Downstream from the traps, the condensate drains may be joined and both must be connected to a common pipe that is connected to a sanitary drain within the building . Check codes to ensure that this is permitted .
· The most important part of fabricating and assembling the drain traps is the length of the individual legs of the traps . If the difference in the lengths of the legs of the traps are not as shown (see Figure 19 for vent drain trap or Figure 20 for heat exchanger drain trap), it could prevent proper drainage of the condensate and possibly permit vent gas to enter the building . Note that the length difference is also what provides a water seal to prevent the leakage of vent gas into the sanitary drain .

Minimum Dimensions for Vent Pipe Condensate Drain Trap C = to suit installation D = C + at least 1-1/2 inches (38 mm) Use 1/2-inch PVC pipe or larger for drain trap

UNIT

4-inch PVC cleanout cap shown is in vent/combustion air kit (option CC6 or CC2)

Cap is drilled and tapped

for 1/2-inch NPT fitting

OR Vent drain connection fittings may be field-supplied as shown

C

Drain must be 1/2-inch or larger

Trap requirements are same for either type of connection

Drain Trap

Figure 19. Vent Condensate Drain Trap

Continue into sanitary drain
D

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31

INSTALLATION–CONTINUED Condensate Drain Installation–Continued

UNIT

Minimum Dimensions for Secondary Heat Exchanger Condensate Drain Trap A = 3 inches (76 mm) minimum B = A + at least 5 inches (127 mm)
Use 1/2-inch PVC pipe or larger for condensate drain

NOTE: Bottom of fan guard is removed for better view.

Continue into sanitary drain

B

A

Drain Trap Figure 20. Heat Exchanger Condensate Drain Trap
Vent Condensate Drain Installation (Unit Sizes 55­110)

NOTE: In Canada, all PVC vent pipe must be approved to ULC S636.
Install the vent condensate drain on unit sizes 55­110 using the PVC cleanout cap provided with the heater as follows (see Figure 21): 1 . Connect field- supplied PVC tee to 4-inch vent outlet on back of heater . 2 . Connect 4-inch PVC cleanout cap to tee . Cap is drilled and tapped for 1/2-inch NPT drain connection . 3 . Connect field-supplied condensate drain to cap .

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TO VENT OUTLET ON
BACK OF HEATER
CLEANOUT CAP

FIELD-SUPPLIED TEE
FIELD-SUPPLIED DRAIN

TO VENT OUTLET ON
BACK OF HEATER
FIELD-SUPPLIED TEE
CLEANOUT CAP

FIELD-SUPPLIED
FIELD-SUPPLIED DRAIN

Figure 21. Installing Condensate Drain (Unit Sizes 55­110)
Vent Condensate Drain Installation (Unit Sizes 130­310)
NOTE: In Canada, all PVC vent pipe must be approved to ULC S636.
Install the vent condensate drain on unit sizes 130­310 as follows . Ensure that the drain trap is in accordance with Figure 19 . 1 . For vertical vent (see Figure 22):
a . Connect field-supplied 4-inch coupling to 4-inch vent outlet on back of heater . Ensure that coupling slopes downward away from heater .
b . Connect 4-inch diameter vent pipe–12-inch (305-mm) minimum length, 24-inch (610-mm) maximum length–to coupling .
c . For US installations only (see Figure 22, DETAIL A): (1) Connect field- supplied 4 × 4 × 4 PVC tee to vent pipe . (2) Connect PVC cap included in option CC2 to tee . Cap is drilled and tapped for 1/2-inch NPT drain connection . (3) Connect field-supplied condensate drain to cap .
d . For US or Canadian installations (see Figure 22, DETAIL B): (1) Connect field-supplied PVC tee to vent pipe . (2) Connect field-supplied fitting(s) to tee as needed for 1/2-inch or larger condensate drain line .

TEE COUPLING

TEE COUPLING

VENT PIPE
12­24 (305­610)

CAP

DETAIL A (US ONLY)

VENT PIPE

12­24 (305­610)

DRAIN FITTING(S)

DETAIL B (US AND CANADA)

Figure 22. Installing Condensate Drain in Vertical Vent (Unit Sizes 130­310)

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33

INSTALLATION–CONTINUED
Condensate Drain Installation–Continued
Vent Condensate Drain Installation (Unit Sizes 130­310)–Continued 2 . For horizontal or vertical vent (see Figure 23):
a . For US installations only (see Figure 23, DETAIL A): (1) Connect field- supplied 4 × 4 × 4 PVC tee to 4-inch vent outlet on back of heater . (2) Connect PVC cap included in option CC2 or CC6 to tee . Cap is drilled and tapped for 1/2-inch NPT drain connection . (3) Connect field-supplied condensate drain to cap . Balance of vent may be either horizontal or vertical . Ensure that horizontal vent slopes downward toward drain .
b . For US or Canadian installations (see Figure 23, DETAIL B): (1) Connect field-supplied PVC tee to 4-inch vent outlet on back of heater . (2) Connect field-supplied fitting(s) to tee as needed for 1/2-inch or larger condensate drain line . Balance of vent may be either horizontal or vertical . Ensure that horizontal vent slopes downward toward drain .

TEE

TEE

CAP
DETAIL A (US ONLY)

DRAIN FITTING(S)
DETAIL B (US AND CANADA)

Figure 23. Installing Condensate Drain in Vertical or Horizontal Vent (Unit Sizes 130­310)

Heat Exchanger Condensate Drain Installation
Install the heat exchanger condensate drain in accordance with all piping requirements listed in this manual and with Figure 20 . For drain kit components and installation instructions for replacement heat exchangers, refer to the replacement parts manual found at www.reznorhvac.com .
Electrical Connections
CAUTION
· All electrical wiring and connections, including electrical grounding MUST be made in accordance with the National Electric Code (ANSI/NFPA No. 70, latest edition) or, in Canada, the Canadian Electric Code (Part 1, CSA C.22.1). In addition, the installer should be aware of any local ordinances or gas company requirements that might apply.
· Route wires so that they do not contact the flue wrapper or venter housing.
· If any of the original wire supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 220°F (105°C), except for limit control, flame rollout, and sensor lead wires which must be rated at 302°F (150°C).

NOTES: · Ensure that all wiring is in accordance with the wiring diagram provided with the unit. · A two-stage valve circuit is NOT available on all models.

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UEZ-IOM (07-24) 1034347-L

· Check the rating plate on the heater for the supply voltage and current requirements . A dedicated line voltage supply with a disconnect switch should be run directly from the main electrical panel to the heater .
· All external wiring must be within approved conduit and have a minimum temperature rise rating of 140°F (60°C) . Conduit must be run so as not to interfere with the heater access panel .
· If the installation requires a stepdown transformer (option CG), follow the instructions shipped with the option package for installing the transformer .
· The unit includes a built-in disconnect switch (20A@115V or 10A@230V rating) . · The supply wiring enters at the rear of the heater, as shown in Figure 24 . Supply wiring connects to leads located
inside a sealed electrical box . To maintain the sealing feature of the electrical box, always replace the cover plate . · The terminal strip for the 24V thermostat connections is located on the outside of the cabinet at the back of the
heater, as shown in Figure 24 . Wires from the terminal strip are factory- wired to the circuit board . · The circuit board (see Figure 25) is located inside on the bottom of the control compartment . The circuit board is
polarity sensitive . It is advisable to check the electrical supply to ensure that the black wire is the hot wire and that the white wire is the neutral wire . The hot wire must be connected to terminal L1 on the circuit board .
TERMINAL STRIP FOR THERMOSTAT CONNECTION
LINE VOLTAGE ENTRANCE

TERMINAL STRIP FOR THERMOSTAT
CONNECTION

UNIT SIZES 055­110

UNIT SIZES 130­310

C R G W1 W2
Figure 24. Supply Wiring Entrance and Control Connection Terminal Strip

Figure 25. Circuit Board (DSI Control Module)

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35

CONTROLS

NOTE: Refer to the TROUBLESHOOTING section for probable causes and reset instructions for the following controls.
Locations for the following controls are shown in Figure 26 .

DSI CONTROL MODULE
IGNITOR HIGH TEMPERATURE
LIMIT CONTROL

PRESSURE SWITCH TRANSFORMER INTERLOCK DOOR SWITCH FAN MOTOR

FLAME ROLLOUT SWITCH FLAME SENSOR
COMBINATION GAS VALVE

VENT TEMPERATURE LIMIT SWITCH
DISCONNECT SWITCH

PRESSURE SWITCH

VENTER MOTOR

UNIT SIZES 055­110
HIGH TEMPERATURE LIMIT CONTROL

DISCONNECT SWITCH

FLAME SENSOR
IGNITOR

INTERLOCK DOOR
SWITCH

VENTER MOTOR

FAN MOTOR

DSI CONTROL MODULE

TRANSFORMER

COMBINATION GAS VALVE

UNIT SIZES 130­310

Figure 26. Component Locations

VENT TEMPERATURE LIMIT SWITCH

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Thermostat Options
NOTES:
· IMPORTANT: all units MUST be operated by a 24V thermostat. Never use a line voltage disconnect switch as a means of operating the heater.
· For all availaible thermostat and thermostat accessory options, contact contact an authorized Factory Distributor.
· Install an optional thermostat (available with the heater) or a field- supplied 24V thermostat in accordance with the thermostat manufacturer’s instructions . Pay particular attention to the requirements regarding the location of the thermostat .
· Ensure that if there is a heat anticipator setting on the thermostat, it is set at 0 .6 amps or in accordance with the amperage value noted on the heater wiring diagram .
· Make thermostat connections at the terminal strip on the back of the heater (see Figure 24) . The strip has five terminals: C, R, G, W1, and W2 . Refer to the wiring diagram provided with the heater .
· If the heater was ordered with a multiple heater control option, one thermostat can be used to control up to five heaters . This option includes a 40VA transformer that replaces the standard transformer in the control unit and a relay assembly that attaches to the additional unit . Option CL31 provides for control of two heaters . If control of additional heaters is desired (up to five total), option CL32, which is the relay assembly only, must be added to each additional heater . The option packages are shipped separately and include complete instructions on installation and wiring .
Combination Gas Valve
WARNING
The combination gas valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting the unit to ensure positive closure.
The combination gas valve (see Figure 26 for location) is powered by the 24V control circuit through the thermostat and safety controls . The diaphragm- type valve is pre-set at the factory and provides regulated gas flow .
Pressure Switch
DANGER
Safe operation of this unit requires proper venting flow. NEVER bypass the pressure switch or attempt to operate the unit without the venter running and the proper flow in the vent system. Hazardous conditions could result.
· The pressure (combustion air proving) switch (see Figure 26 for location) is a pressure-sensitive switch that monitors air pressure to ensure that proper combustion airflow is available .
· The pressure switch senses the differential pressure between the negative pressure in the venter housing and the pressure in the cabinet .
· At startup when the heater is cold, the sensing pressure is at the most negative level, and as the heater and vent system warm up, the sensing pressure becomes less negative . After the system has reached equilibrium (about 20 minutes), the sensing pressure levels off .
· If a restriction or excessive vent length/turns cause the sensing pressure to be outside the pressure switch setpoint, the switch will function to shut off the main burner . The main burner will remain off until the system has cooled and/or the flue system resistance is reduced .
· Pressure switch settings are listed in Table 18 .

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Pressure Switch–Continued

CONTROLS–CONTINUED

Table 18. Pressure Switch Settings

Unit Size

Startup Cold

Negative Pressure (IN WC)

Equilibrium Hot

Setpoint OFF

Setpoint ON

Label Color

55

1 .90

1 .60

0 .60

0 .75

85

1 .80

1 .30

0 .60

0 .75

Purple

110

1 .15

1 .15

0 .60

0 .75

130

3 .50

3 .00

2 .40

2 .65

White

180

3 .20

2 .50

2 .30

2 .45

Blue

260

3 .50

3 .10

2 .40

2 .65

White

310

3 .30

2 .80

2 .40

2 .65

High Temperature Limit Control

WARNING
The automatic-reset high temperature limit control will continue to shut down the heater until the cause is corrected. Never bypass this control as hazardous conditions could result.

All units are equipped with a temperature-activated, automatic-reset high temperature limit control (see Figure 26 for location) . The control is factory-set and is non-adjustable . If the setpoint is reached, the control interrupts the electric supply to the combination gas valve . This safety device provides protection in the case of motor failure or lack of airflow due to a restriction at the inlet or outlet .
Vent Temperature Limit Switch
WARNING
If the manual vent temperature limit switch activates, identify and correct the cause before resetting the switch. Never bypass the vent temperature switch as hazardous conditions could result.

All units are equipped with a temperature-activated, manual-reset switch to limit the temperature of vent gases to below 145°F . The switch is attached to the side of the combustion air venter housing (see Figure 26 for location) . If the setpoint is reached, the switch interrupts the electric supply to the combination gas valve . If the switch is activated, identify and correct the cause before resetting the switch .
Interlock Door Switch
All units are equipped with an interlock door switch (see Figure 26 for location) that prevents the heater from operating when the service door panel is open . The service panel is equipped with a pliable gasket that fully seals the door to provide added protection to prevent building air from entering the combustion zone of the heater .
Fan Motor
The fan motor is equipped with automatic-reset thermal overload protection . If the motor does not run, the cause may be due to improper current . Ensure that the correct voltage is available at the motor .
Circuit Board (DSI Control Module)
The heater’s ignition system is controlled by a circuit board (Direct-Spark Integrated (DSI) control module, see Figure 25) that monitors the safety devices and controls the operation of the fan and venter motors and the combination gas valve between heat cycles . To view the Seven-Segment Display (SSD), the door panel requires removal . In addition, there is a status LED on the bottom of the heater . Its status indications are off (heater is not powered or control board fault), steady on (heater is on with no faults), or flashing (heater is on with fault(s)) . Additional status indications appear on the display at the bottom of the control module (labeled as DSP1, see Figure 25) . The display’s codes are listed and described in the Unit Troubleshooting Using DSI Control Module section .

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Venter Motor
The venter motor (see Figure 26 for location) is assembled to the venter wheel and operates to provide combustion airflow . Operation is controlled by the circuit board (see Figure 25) . Refer to the Circuit Board (DSI Control Module) section for details .
Flame Rollout Switch (Unit Sizes 55­110)
DANGER
If the manual-reset flame rollout switch activates, identify and correct the cause before resetting the switch. Never bypass the flame rollout switch; hazardous conditions could result.
Unit sizes 55, 85, and 110 are equipped with a temperature-activated, manually-reset flame rollout switch (see Figure 26 for location) . The switch is factory-set and is non-adjustable . If the setpoint is reached, the switch interrupts the electric supply to the combination gas valve . If the flame rollout switch activates, identify and correct the cause before resetting the switch .
OPERATION
DANGER
· For your safety, read before operating. If you do not follow these instructions exactly, a fire or explosion may result, causing property damage, personal injury, or loss of life.
· This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.
· Before operating, smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
· WHAT TO DO IF YOU SMELL GAS: a. Do not try to light any appliance. b. Do not touch any electrical switch; do not use any phone in your building. c. Leave the building immediately. d. Immediately call your gas supplier from a phone remote from the building. Follow the gas supplier’s instructions. e. If you cannot reach your gas supplier, call your fire department.
· Use only your hand to turn the gas control ON/OFF knob on the combination gas valve. Never use tools. If the valve ON/OFF knob will not turn by hand, do not try to repair it. Call a qualified service technician. Force or attempted repair may result in a fire or explosion.
· Should overheating occur, or the gas supply control system fail to shut off the flow of gas, turn off the manual gas valve to the appliance before shutting off the electrical supply.
· Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.
· All components of a gas supply system must be leak tested prior to placing equipment in service. NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal injury, property damage, or death.

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39

OPERATION–CONTINUED
Pre-Startup Checklist
Check the following before startup: Check to ensure that all screws used to secure shipping brackets have been re-installed in heater cabinet . Check suspension–unit must be secure and level . Check to ensure that clearances from combustibles are in accordance with Table 2 . Check vent system to ensure that it is installed in accordance with Vent Connections section . Check condensate drain system to ensure that it is installed in accordance with Condensate Drain Installation
section . Check piping for leaks and proper gas line pressure and bleed trapped air from gas lines (refer to Supply Piping
Connections section) . Check electrical wiring–ensure that all wire gauges are as recommended–service disconnect switch should be
used–verify that fusing or circuit breakers are adequate for load use . Check polarity–verify that line voltage exists between black L1 wire and earth ground . If installation elevation is >6,000 feet (>1,830 meters), replace pressure switch in accordance with Pressure
Switch Replacement section .
Startup
Start up the heater as follows: 1 . Set thermostat at lowest setting . 2 . Turn OFF all electric power to appliance .
NOTE: This appliance is equipped with an ignition device that automatically lights the burner. Do not try to light the burner by hand.
3 . Open access door and locate gas control (ON/OFF) knob or switch on combination gas valve (see Figure 27) .

Top View ON/OFF Switch

Figure 27. Combination Gas Valve ON/OFF Control

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4 . Turn gas control switch to OFF or turn knob clockwise to OFF . 5 . Wait 5 minutes to clear out any gas and then smell for gas (including near floor) .
a . If you smell gas, STOP! and follow steps in DANGER message listed above or on heater operating label . b . If you do not smell gas, proceed to step 6 . 6 . Turn gas control switch to ON or turn knob counterclockwise to ON . 7 . Close access door . 8 . Turn ON electric power to heater . 9 . Set thermostat to desired setting . a . If heater does not operate, follow instructions in step 13 or on heater operating label and call your service
technician . b . If heater operates, thermostat calls for heat, which energizes venter motor . 10 . Pressure switch closes, which fires unit . 11 . Burner flame is sensed and in 30 seconds after combination gas valve is energized, fan motor is energized . 12 . If flame is extinguished during main burner operation, integrated control system closes main valve and must be reset by interrupting power to control circuit (refer to lighting instructions provided with heater) . 13 . TO TURN OFF GAS TO APPLIANCE: a . Set thermostat to lowest setting . b . If service is to be performed, turn off all electric power to appliance . c . Open the access door . d . Turn gas control switch to OFF or turn knob clockwise to OFF (do not force) . e . Close access door .
Operating Sequences
Table 20 describes the heater’s normal operating sequence . Table 20 describes the heater’s abnormal heat cycle functions . Table 21 describes the heater’s fault modes . Refer to Table 27 for LED indications .

Step
1 . Call for heat

Table 19. Operating Sequence (Normal Heat Cycle)

Condition

Action

Terminal W is energized

Thermostat calls for heat by energizing terminal W

Control determines whether limit switch is open or closed and if pressure switch is open

Limit switch is open

Control deenergizes gas valve, turns fan/blower motor onto heat speed, and runs venter motor

SSD displays “5”

Control is in soft lockout “L” before returning to normal operation

Pressure switch is closed SSD displays “4”

Control waits indefinitely for pressure switch to open

Pressure switch is open

Control proceeds to step 2

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OPERATION–CONTINUED Operating Sequences–Continued

Table 19. Operating Sequence (Normal Heat Cycle)–Continued

Step

Condition

Action

2 . Prepurge Venter motor is energized Control waits for pressure switch to close

Pressure switch not closed within 30 seconds of venter motor energizing

SSD displays “3”
Control maintains venter motor energized indefinitely as long as call for heat remains and pressure switch is open

Pressure switch is proven closed

Control begins prepurge

Flame is present at any time Prepurge is restarted during prepurge

Flame is present long enough to cause lockout

Control runs venter motor and runs fan/blower motor on heat speed
When flame is no longer sensed, venter motor runs through post-purge and fan/blower motor runs through selected delay OFF time

Control proceeds to soft lockout but still responds to open limit and flame

SSD displays “6” when lockout is due to undesired flame

Venter motor runs for 20-second prepurge time

Control proceeds to step 3

3 . Ignition trial period

Spark and main gas valve are energized

Venter remains energized

Flame is sensed during first Control deenergizes spark and proceeds to heat fan/blower on delay 16 seconds

Flame is not sensed during Control deenergizes spark and maintains gas valve energized for additional 1-second flame-

first 16 seconds

proving period

Flame is not present after flame-proving period

Control deenergizes gas valve and proceeds with ignition retries as specified in Table 20: abnormal function Ignition Retry

Flame is present after flame- Control proceeds to step 4 proving period

4 . Fan/blower 30 seconds after gas valve Control energizes fan/blower motor

ON delay

has opened

Gas valve and venter motor Control proceeds to step 5 remain energized

5 . Steady heat

Limit switch is closed Pressure switch is closed

Control continuously monitors inputs

Flame is established

Thermostat call for heat remains

Thermostat call for heat is Control deenergizes gas valve and proceeds to steps 6 and 7 removed

6 . Post-purge Thermostat is satisfied

Venter motor remains on for 45-second post-purge period

7 . Fan/blower OFF delay

Fan/blower motor is deenergized after selected fan/blower OFF delay

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UEZ-IOM (07-24) 1034347-L

Table 20. Operating Sequence (Abnormal Heat Cycle)

Abnormal Function

Condition

Action

Interrupted thermostat call for heat

Thermostat demand for heat is removed before flame is recognized
Thermostat demand for heat is removed after successful ignition

Control runs venter motor for post-purge period All outputs are deenergized Control deenergizes gas valve Control runs venter motor through post-purge period

Control runs fan/blower motor on heat speed for selected delay OFF time

Ignition retry Flame is not established on first trial for ignition period

Control deenergizes gas valve Venter motor remains energized for 10-second inter-purge period

Spark and gas valve are re-energized

Control initiates another trial for ignition

Flame is not established on second trial for ignition

Control deenergizes gas valve Control runs fan/blower motor on heat speed

Venter motor remains energized

Fan/blower motor deenergizes after selected delay OFF period and spark and gas valve are re-energized

Control initiates another trial for ignition (this fan delay is self-healing feature for open auxiliary limit switch)

Flame is not established on third trial Control deenergizes gas valve

for ignition

Venter motor remains energized for 10-second inter-purge period

Spark and gas valve are re-energized

Control initiates another trial for ignition

Flame is not established on fourth trial Control deenergizes gas valve and proceeds to lockout for ignition (initial try plus three re-tries) SSD displays “L” to indicate ignition failure lockout

Limit switch* Limit switch is open and call for heat is Control deenergizes gas valve

present

Control runs venter motor and runs fan/blower motor on heat speed

Control is in soft lockout (SSD displays “L”) before returning to normal operation

Limit switch re-closes or call for heat is Control runs venter motor through post-purge period

not present

Control runs fan/blower motor on heat speed through selected delay OFF period

Pressure switch operation

Pressure switch opens before trial for ignition period

Venter motor runs through 2-second pressure switch recognition delay Control deenergizes gas valve Control runs venter motor through post-purge period

Control restarts heat cycle at pressure switch proving state if call for heat still exists

Pressure switch opens for less than 2 Control deenergizes gas valve while pressure switch is open seconds during trial for ignition period (shall not interrupt heat cycle)

Pressure switch opens after successful Control deenergizes gas valve ignition

Flame is lost before end of 2-second Control responds to loss of flame pressure switch recognition delay

Pressure switch remains open for 2 seconds and flame remains

Control deenergizes gas valve Control runs venter motor through post-purge period

Control runs fan/blower motor on heat speed through selected delay OFF period

When fan OFF delay ends, fan/blower motor is deenergized, and heat cycle begins if call for heat still exists

Continuous Thermostat calls for continuous fan (G) Fan motor is energized after 0 .25-second delay (this brief ON delay allows terminal

fan operation without call for heat

G to energize slightly before terminal Y and allows external changeover relay to

switch from terminal G to terminal W without causing momentary glitches in fan/

blower output

Fan remains energized as long as call for fan remains without call for heat

Thermostat calls for heat (W) during continuous fan operation

Fan/blower is deenergized Call for fan is ignored during lockout

*The limit switch is ignored unless a call for heat is present (terminal W energized) .

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OPERATION–CONTINUED Operating Sequences–Continued

Fault Mode Undesired flame
Gas valve relay fault
Soft lockout
Hard lockout Power interruption

Table 21. Fault Modes

Condition

Action

Flame is sensed longer than 20 seconds while gas valve is deenergized

Control runs venter motor and runs fan/blower motor on heat speed
When flame is no longer sensed, venter motor runs through post-purge and fan/ blower motor runs through selected delay OFF time

Control proceeds to soft lockout but still responds to open limit and flame

SSD displays “6” when lockout is due to undesired flame

Control senses that gas valve is energized for more than 1 second when control is not attempting to energize gas valve or control senses that gas valve is not energized when it is supposed to be energized

Control proceeds to lockout (SSD is blank)
Control assumes either that contacts of relay driving gas valve have welded shut or that sensing circuit has failed
Venter motor is forced OFF to open pressure switch to stop gas flow unless flame is present

Control senses that gas valve is

Venter motor is re-energized to vent unburned gas

closed when it should be open (has

not deenergized after venter motor has

been shut off for 15 seconds

Control does not initiate call for heat or call for continuous fan operation while in lockout

Control still responds to open limit and undesired flame
Lockout is automatically reset after 1 hour
Lockout may be manually reset by removing power from control for more than 1 second or by removing thermostat call for heat for more than 1 but less than 20 seconds

Control detects fault on control board SSD is blank or displays “L” (fault dependent)

Control remains in lockout as long as fault remains

Hard lockout automatically resets when hardware fault clears

Momentary interruption or voltage level System self-recovers without lockout when voltage returns to operating range is below minimum operating voltage (line voltage or low voltage)

Interruption <80 milliseconds

Control does not change operating state

Interruption >80 milliseconds

Control may interrupt current operating cycle to restart

Vent System Testing
For each heater or utility heater connected to the venting system and placed in operation while any other appliance(s) connected to the venting system(s) is not in operation, test the vent system as follows:
1 . Seal unused openings(s) in vent system .
2 . Inspect vent system for proper size and horizontal pitch as required in National Flue Gas Code (ANSI Z223 .1/ NFPA 54) or Natural Gas and Propane Installation Code (CSA B149 .1) and in venting instructions .
3 . Verify that there is no blockage or restriction, leakage, corrosion, and/or other deficiencies that could cause any unsafe condition .
4 . In so far as is practical, close all doors, windows, and other open spaces within building and all doors between space in which appliance(s) is connected and space where vent system is located .
5 . Close any fireplace dampers .
6 . Turn on clothes dryers and any exhaust fans (such as range hoods and bathroom exhausts) so that they operate at maximum speed . Do not operate a summer exhaust fan .
7 . Following lighting instructions provided with heater, place utility heater being inspected in operation . Adjust thermostat so that utility heater will operate continuously .

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UEZ-IOM (07-24) 1034347-L

8 . After it has been determined that each utility heater connected to vent system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous condition of use .
9 . If improper venting is observed during above tests, vent system must be corrected .
Post-Startup Checklist
Check the following after startup: Ensure that vent system has been tested in accordance with Vent System Testing section . With unit in operation, measure manifold (outlet) gas pressure in accordance with Measure and Adjust Manifold
(Outlet) Gas Pressure section . Turn unit OFF and ON, pausing 2 minutes between each cycle; observe for smooth ignition . Place literature bag that contains Limited Warranty, this manual, and any control or optional information in
accessible location near heater .
DANGER
· The gas burner in this gas-fired equipment is designed and equipped to provide safe controlled complete combustion. However, if the installation does not permit the burner to receive the proper supply of combustion air, complete combustion may not occur. The result is incomplete combustion, which produces carbon monoxide, a poisonous gas that can cause death. Safe operation of indirect-fired gas burning equipment requires a properly operating vent system that vents all flue products to the outside atmosphere. FAILURE TO PROVIDE PROPER VENTING WILL RESULT IN A HEALTH HAZARD THAT COULD CAUSE SERIOUS PERSONAL INJURY OR DEATH.
· Always comply with the combustion air requirements listed in the installation codes and in this manual. Combustion air at the burner should be regulated only by manufacturer-provided equipment. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER. MAINTAIN THE VENT OR VENT/COMBUSTION AIR SYSTEM IN STRUCTURALLY SOUND AND PROPER OPERATING CONDITION.
ADJUSTMENTS
After startup, the combination gas valve outlet pressure must be measured and adjusted if necessary in accordance with the Measure and Adjust Manifold (Outlet) Gas Pressure section . If the heater is being installed at an elevation of >6,000 feet (>1,830 meters), the pressure switch must be replaced in accordance with the Pressure Switch Replacement section before the gas pressure is adjusted .
Pressure Switch Replacement
For installations at elevations >6,000 feet (>1,830 meters), the pressure switch (see Figure 28) must always be replaced before the heater is operated . If ordered with the unit as part of a high-elevation kit (refer to Table 11), the switch is shipped separately for field-installation . Replace the pressure switch as follows:
1 . Locate pressure switch in control compartment (see Figure 26) and mark and disconnect two switch wires .
2 . Mark and disconnect sensing tube(s) from pressure switch .
3 . Remove two screws that secure mounting bracket and remove bracket and pressure switch . Save bracket and screws for reuse .
4 . Install replacement pressure switch (refer to replacement parts manual found at www.reznorhvac.com for PN) using mounting bracket and two screws . Reconnect sensing tube(s) and wires .

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ADJUSTMENTS–CONTINUED Pressure Switch Replacement–Continued
Figure 28. Pressure Switch
Measure and Adjust Manifold (Outlet) Gas Pressure If the heater is being installed at an elevation 2,000 feet (610 meters), adjust the manifold (outlet) gas pressure in accordance with the Measure and Adjust Manifold Gas Pressure–Elevation 2,000 Feet (610 Meters) section . If the heater is being installed at an elevation >2,000 feet (>610 meters), adjust the manifold (outlet) gas pressure in accordance with the Measure and Adjust Manifold Gas Pressure–Elevation >2,000 Feet (>610 Meters) section .
WARNING
Valve outlet gas pressure must never exceed 3.5 IN WC for natural gas or 10 IN WC for propane. The maximum inlet supply pressure for natural gas or propane is 14 IN WC.
CAUTION
Before attempting to measure or adjust valve outlet gas pressure, the inlet supply pressure must be within the specified range, both when the heater is in operation and when it is on standby. Incorrect inlet pressure could cause excessive valve outlet gas pressure immediately or at some future time. If natural gas supply pressure is too high, install a regulator in the supply line before it reaches the heater. If natural gas supply pressure is too low, contact your gas supplier.
NOTES: · Measuring outlet pressure cannot be done until the heater is in operation. · During normal operation with natural gas at sea level, adjustment to factory-setting should not
be necessary. · For natural gas: when the heater leaves the factory, the combination gas valve is set so that the
valve outlet gas pressure for a single-stage valve is regulated to 3.5 IN WC. Inlet supply pressure to the valve for natural gas must be a minimum of 5 IN WC or as noted on the rating plate and a maximum of 14 IN WC. · For propane: the heater is shipped factory-equipped for use with natural gas. A propane conversion kit is included. Follow the instructions in the Converting Unit from Natural Gas to Propane section to convert for use with propane. Inlet supply pressure to the valve for propane must be a minimum of 11 IN WC and a maximum of 14 IN WC.

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Measure and Adjust Manifold Gas Pressure–Elevation 2,000 Feet (610 Meters) For installations at normal elevations, measure and adjust the manifold (outlet) gas pressure as follows: 1 . Turn knob or switch on top of valve to OFF to prevent flow to combination gas valve . NOTE: Use a water column manometer that is readable to the nearest tenth of an inch. 2 . Connect manometer to 1/8-inch output pressure tap on valve (see Figure 29) .

REGULATOR SCREW

1/8-INCH OUTLET PRESSURE TAP

REGULATOR SCREW

1/8-INCH OUTPUT PRESSURE TAP

INLET PRESSURE TAP
UNIT SIZES 055, 085, 110, 130, AND 180

INLET PRESSURE TAP
UNIT SIZES 260 AND 310

Figure 29. Combination Gas Valves
3 . Open manual valve and operate heater . Depress and hold door safety switch . 4 . Cycle burner once or twice to properly seat adjustment spring in valve and observe manometer gauge to measure
outlet pressure of combination gas valve .
CAUTION
DO NOT bottom out the combination gas valve regulator screw. This can result in excessive overfire and heat exchanger failure due to unregulated manifold pressure.

5 . If manometer reading does not indicate that valve outlet pressure is in accordance with Table 22, remove cap from regulator screw(s) (see Figure 29) and adjust pressure by turning regulator screw IN (clockwise) to increase pressure or OUT (counterclockwise) to decrease pressure .
6 . When manometer reading indicates that outlet pressure is in accordance with Table 22, disconnect manometer and install cap(s) on regulator screw(s) .

Feet
0­2000 2001­3000 3001­4000 4001- 5000 5001­6000 6001­7000 7001­8000 8001­9000 9001­10,000
0­2000 2001­4500

Elevation

Table 22.
Meters
0­610 611­915 916­1220 1221­1525 1526­1830 1831­2135 2136­2440 2441­2745 2746­3045
0­610 611­1373

Required Manifold (Outlet) Gas Pressure

Unit Size (MBTUh)

Natural Gas

55, 85, 110, 130, 260

180, 310

Propane

Manifold Pressure (IN WC)

US

3 .5

10 .0

9 .5

3 .1

8 .8

8 .4

3 .0

8 .5

8 .0

2 .8

8 .1

7 .7

2 .7

7 .7

7 .3

2 .6

7 .4

7 .0

2 .5

7 .1

6 .7

2 .4

6 .7

6 .3

2 .2

6 .4

6 .0)

Canada

3 .5

10 .0

9 .5

2 .8

8 .1

7 .7

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ADJUSTMENTS–CONTINUED
Measure and Adjust Manifold (Outlet) Gas Pressure–Continued
Measure and Adjust Manifold Gas Pressure–Elevation >2,000 Feet (>610 Meters)
For installations at high elevations, measure and adjust the manifold (outlet) gas pressure as follows: 1 . If installation is at elevation >6,000 feet (1,830 meters), replace pressure switch in accordance with Pressure
Switch Replacement section .
WARNING
Manifold gas pressure must never exceed 3.5 IN WC for natural gas or 10 IN WC for propane.
2 . Determine correct outlet pressure (refer to Table 22) for elevation of installation . If unsure of elevation, contact local gas supplier .
3 . Turn knob or switch on top of valve to OFF to prevent flow to combination gas valve .
NOTE: Use a water column manometer that is readable to the nearest tenth of an inch.
4 . Connect manometer to 1/8-inch output pressure tap on valve (see Figure 29) .
CAUTION
DO NOT bottom out the gas valve regulator screw. This can result in excessive overfire and heat exchanger failure due to unregulated manifold pressure.
5 . Turn knob or switch on top of valve to ON . 6 . Remove cap from regulator screw (see Figure 29) and adjust pressure in accordance with Table 22 by turning
regulator screw IN (clockwise) to increase pressure or OUT (counterclockwise) to decrease pressure . 7 . Turn up thermostat . Depress and hold door safety switch . 8 . Cycle burner once or twice to properly seat adjustment spring in valve and recheck outlet pressure . When pressure
corresponds to Table 22, disconnect manometer and install cap on regulator screw . 9 . Check for leakage at 1/8-inch outlet pressure tap fitting . Correct as necessary . 10 . Connect manometer to inlet pressure tap (see Figure 29) . While heater is operating, measure inlet pressure,
which should be between 5 and 13 .5 IN WC for natural gas or between 10 and 13 .5 IN WC for propane . 11 . If inlet pressure is not between 5 and 13 .5 IN WC for natural gas or between 10 and 13 .5 IN WC for propane,
inlet pressure must be corrected by adjusting manifold (outlet) pressure in accordance with steps 3 through 6 .
NOTE: The inputs and capacity of the heater varies depending on elevation.
12 . Refer to Table 23 for input and capacity values for elevation of installation . a . Use permanent marker to fill in appropriate input and capacity values on high-elevation adjustment label from literature bag provided with unit . b . Select location for label on outside of heater access panel that will be conspicuous to anyone operating or servicing unit . c . Ensure that surface is clean and dry and affix label .
13 . Observe heater operation for at least one complete cycle to check for safe and proper operation . Depress and hold safety door switch .

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UEZ-IOM (07-24) 1034347-L

Table 23. Inputs and Capacities by Elevation

Unit Size (MBTUh)

Elevation (Feet (Meters))

55 NI TOC

85 NI TOC

110 NI TOC

130 NI TOC

180 NI TOC

260 NI TOC

310 NI TOC

BTUh

US

0­2000 (0­610)

55,000 51,150 85,000 79,050 110,000 102,300 131,000 121,830 175,000 159,250 260,000 239,200 305,000 277,550

2001­3000 (611­915)

52,800 49,104 81,600 75,888 105,600 98,208 123,140 114,520 164,500 149,695 244,400 224,848 286,700 260,897

3001­4000 (916­1220)

50,688 47,140 78,336 72,852 101,376 94,280 120,520 112,084 161,000 146,510 239,200 220,064 280,600 255,346

4001­5000 (1221­1525)

48,660 45,254 75,203 69,938 97,321 90,508 117,900 109,647 157,500 143,325 234,000 215,280 274,500 249,795

5001­6000 (1526­1830)

46,714 43,444 72,194 67,141 93,428 86,888 115,280 107,210 154,000 140,140 228,800 210,496 268,400 244,244

6001­7000 (1831­2135)

44,845 41,706 69,307 64,455 89,691 83,413 112,660 104,774 150,500 136,955 223,600 205,712 262,300 238,693

7001­8000 (2136­2440)

43,052 40,038 66,534 61,877 86,103 80,076 110,040 102,337 147,000 133,770 218,400 200,928 256,200 233,142

8001­9000 (2441­2745)

41,330 38,437 63,873 59,402 82,659 76,873 107,420 99,901 143,500 130,585 213,200 196,144 250,100 227,591

9001­10,000 (2746­3045)

39,676 36,899 61,318 57,026 79,353 73,798 104,800 97,464 140,000 127,400 208,000 191,360 244,000 222,040

Canada

0­2000 (0­610)

55,000 51,150 85,000 79,050 110,000 102,300 131,000 121,830 175,000 159,250 260,000 239,200 305,000 277,550

2001­4500 (611­1373)

48,660 45,254 75,203 69,938 97,321 90,508 117,900 109,647 157,500 143,325 234,000 215,280 274,500 249,795

*NI = normal input . TOC = thermal output capacity .

Converting Unit from Natural Gas to Propane
The heater is shipped factory-equipped for use with natural gas . A propane conversion kit is provided with each heater . Ensure that components in the kit are available (refer to Table 24) and install the kit as follows: 1 . Install propane regulator spring kit in combination gas valve in accordance with valve manufacturer’s instructions
included with kit . 2 . Attach propane disk near combination gas valve . 3 . Carefully remove natural gas orifice(s) (see Figure 26) from heater and install propane orifice(s) . 4 . Install labels:
a . Use permanent marker to fill in appropriate information on conversion label from kit . b . Select location for label near rating plate . c . Ensure that surface is clean and dry and affix conversion label and regulated propane label from kit . 5 . During heater startup, check valve outlet pressure in accordance with Measure and Adjust Manifold (Outlet) Gas Pressure section .

Component
Conversion kit Regulator spring kit
Burner orifice
Label Gas disk

Table 24. Propane Conversion Kit Components

Unit Size (MBTUh)

Description

55

85

110

130

180

260

310

PN

Package PN

1041262

261647 1036196R 1036197R 221445

Honeywell #396221

260605

260605

—

Honeywell #393691

—

—

98720

PN 661057 661079 661082 120145 196899 1034352 196903

Drill size #57

1 .2 mm 1 .25 mm 3 .3 mm

24

4 .6 mm

8

Quantity

4

5

6

1

Conversion

64391

64391

Regulated propane

79718

79718

Propane

37752

37752

UEZ-IOM (07-24) 1034347-L

49

MAINTENANCE
WARNING
· If you turn OFF the electrical power supply, turn OFF the gas.
· Eye protection is recommended when cleaning unit.
CAUTION
· When any service is completed, ensure that the unit is reassembled correctly so that no unsafe conditions are created.
· When re-lighting, always follow the lighting instructions on the heater. · If any of the original wire supplied with the appliance must be replaced, it must be replaced
with wiring material having a temperature rating of at least 105°C, except for limit control, flame rollout, and sensor lead wires which must be rated at 150°C.
· If replacement parts are required, use only factory-authorized parts.
NOTE: To ensure long life and satisfactory performance, a heater that is operated under normal conditions should be inspected and cleaned at the start of each heating season. If the heater is operating in an area where an unusual amount of dust or soot or other impurities are present in the air, more frequent maintenance is recommended.
The unit is designed to operate with a minimum of maintenance . However, to ensure long life and satisfactory performance, routine service is recommended . When servicing, follow standard safety procedures and those specific instructions and warnings in this manual .The following is designed to aid a qualified service person in maintaining and servicing this equipment .
Service Checklist
At a minimum, perform the following annually (see Figure 26 for component locations): Inspect burner/control compartment annually to determine if cleaning is necessary . Clean all dirt, lint, and grease from combustion air opening and venter assembly . Clean all dirt, lint, and grease from fan blade, fan guard, and motor . Clean condensate drain traps . Check heat exchanger both internally and externally . Check burner for scale, dust, or lint accumulation and clean if needed . Check gas valve to ensure that gas flow is being shut off completely . Check vent or vent/combustion air system for soundness and clean openings . Replace any parts that do not appear sound . Check for any damaged wiring and replace as necessary .
Maintenance Procedures
Burner Maintenance (Unit Sizes 55­110)
NOTE: Burner cleaning is not normally necessary for unit sizes 55, 85, and 110, but may be required if the unit is in a dirty location.
Visually inspect the burner compartment (see Figure 30) . If there is an accumulation of dirt, dust, and/or lint, clean the compartment and remove and clean the burners as follows:

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UEZ-IOM (07-24) 1034347-L

IGNITOR FLAME ROLLOUT SWITCH
INSHOT BURNER BURNER RACK
FLAME SENSOR GAS MANIFOLD COMBINATION GAS VALVE

Figure 30. Burner Compartment (Unit Sizes 55­110)
1 . Remove gas and electric supply: a . Shut OFF gas supply ahead of union at manual valve outside cabinet . b . Turn OFF electric supply . c . Disconnect gas supply at union outside of cabinet .
2 . Remove burner assembly (see Figure 30): a . Remove access panel . b . Disconnect gas train . c . Mark and disconnect wires at combination gas valve, ignitor, flame sensor, and flame rollout switch .
CAUTION
Take care not to damage the ignitor while removing or cleaning the burner assembly.
3 . Remove screws that secure gas manifold to burner box and carefully remove burner assembly .
NOTE: If, upon inspection, any burner components are damaged or deteriorated, replace the burner assembly.
4 . Shine flashlight on burners and use compressed air or vacuum cleaner to loosen and remove any accumulated dust or debris .
5 . Re-install burner assembly (see Figure 30): a . Install burner assembly and gas manifold and secure gas manifold to burner box using screws removed in step 3 . b . Reconnect wires to combination gas valve, ignitor, flame sensor, and flame rollout switch . c . Reconnect gas train . d . Install access panel . e . Reconnect gas supply at union outside of cabinet . f . Leak test connection using leak detecting solution . If leak is detected, tighten connection . If leak cannot be stopped by tightening connection, replace part(s) .
6 . Turn ON electric and gas . 7 . Check for proper operation .

UEZ-IOM (07-24) 1034347-L

51

MAINTENANCE–CONTINUED
Maintenance Procedures–Continued
Burner Maintenance (Unit Sizes 130­310)
NOTE: The unit is equipped with a TCORE2® burner.
Visually inspect the burner compartment (see Figure 31) . If there is an accumulation of dirt, dust, and/or lint, clean the compartment and remove and clean the burner as follows: 1 . Remove gas and electric supply:
a . Shut OFF gas supply ahead of union at manual valve outside cabinet . b . Turn OFF electric supply . c . Disconnect gas supply at union outside of cabinet . 2 . Remove burner assembly (see Figure 31): a . Remove access panel . b . Disconnect gas train:
(1) Mark and disconnect wires at combination gas valve . (2) Carefully remove burner orifice and orifice adapter locking nut . (3) Slide orifice adapter out through bracket on burner while pushing gas train to right . This will move gas
train out of way .
BURNER BODY SUPPORT
SECONDARY AIR SHIELD

BURNER ASSEMBLY

ORIFICE ADAPTER LOCKING NUT
VENTURI TUBE

SECONDARY AIR BAFFLE

GAS VALVE

Figure 31. Burner Compartment (Unit Sizes 130­310)

c . Detach control assembly: (1) Remove two screws that secure control assembly bracket . (2) Being careful not to disconnect any wires, slide control assembly to right .
d . Remove secondary air baffle(s): (1) Locate flat plate(s) identified as secondary air baffle(s)–vertical along right side of burner . Quantity of baffles could be one to four depending on heater size . Each baffle is held in place by one screw . (2) For correct re-assembly on secondary air shield, mark location (top and bottom) of each baffle . (3) Remove screw(s) and remove baffle(s) (all) .

52

UEZ-IOM (07-24) 1034347-L

e . Locate burner body supports–depending on size, burner will have two or more supports . At each support, remove one screw that secures support to secondary air shield .
f . While holding venturi tube, slide entire burner assembly slightly to right to disengage burner from supports on left . g . Rotate open end of venturi tube inward toward heater and carefully pull burner assembly out of cabinet . 3 . Inspect and clean burner:
NOTE: If, upon inspection, any of the burner components are damaged or deteriorated, replace the burner assembly.
a . With burner assembly removed, shine flashlight on burner ribbons . Look for carbon buildup, scale, dust, lint, and/or anything that might restrict flow through spaces between burner ribbons .
b . While holding burner assembly so that any foreign material will fall away from burner, use stiff bristle brush to loosen and remove any foreign material(s) .
c . If burner is excessively dirty, remove one burner end cap: (1) Remove four screws that secure end cap to burner housing . (2) Lightly tap end cap to remove it .
d . Clean all foreign material from burner and venturi . e . When burner is thoroughly clean, replace end cap, ensuring that it is tight against burner housing . 4 . Inspect lower part of heat exchanger: a . With burner assembly removed, shine bright light into each heat exchanger section at burner flame entrance
of each tube . b . With light shining into heat exchanger, observe outside for visible light . Repeat for each heat exchanger section . c . If any light is observed, replace heat exchanger . 5 . Re-install burner assembly (see Figure 31): a . Attach burner assembly:
(1) While holding venturi tube, slide entire burner assembly into position . (2) Align supports on left side with slots in burner shield and slide supports into slots . (3) On right, install screw that secures each burner body support to secondary air shield . b . Re-install secondary air baffles–install screw that secures each baffle(s)–baffles may be different sizes and each must be installed in correct location as marked . c . Attach control assembly: (1) Carefully slide control assembly into position and secure using same screws . (2) Check to ensure that all wire connections are secure . d . Reconnect gas train: (1) Slide gas train into position so that orifice adapter is slid through bracket on burner . (2) Secure gas train to bracket using locking nut . (3) Install gas orifice and reconnect wires to combination gas valve . e . Install access panel . f . Reconnect gas supply at union outside of cabinet . g . Leak test connection using leak detecting solution . If leak is detected, tighten connection . If leak cannot be stopped by tightening connection, replace part(s) . 6 . Turn ON electric and gas . 7 . Check for proper operation .

UEZ-IOM (07-24) 1034347-L

53

MAINTENANCE–CONTINUED
Maintenance Procedures–Continued
Burner Orifice Maintenance
The burner orifice usually needs to be replaced only when installing a gas conversion kit . When ordering a replacement orifice only, provide BTUh content and specific gravity of gas as well as the model and serial number of the unit . When removing or replacing the burner orifice, take care not to damage the venturi tube and/or the bracket .
Heat Exchanger Maintenance
NOTE: Inspection of the lower portion of the heat exchanger is done with the burner removed. Refer to the Burner Maintenance (Unit Sizes 130­310) section for information on inspecting the lower portion of the heat exchanger.
1 . Remove burner in accordance with Burner Maintenance (Unit Sizes 55­110) or Burner Maintenance (Unit Sizes 130­310) section .
2 . Remove any external dirt or dust accumulation . 3 . Visually inspect heat exchanger for cracks and holes . 4 . If crack or hole is found, replace heat exchanger . 5 . Install burner in accordance with Burner Maintenance (Unit Sizes 55­110) or Burner Maintenance (Unit Sizes
130­310) section .
Ignition System Maintenance
· The DSI control module (circuit board, see Figure 25) monitors the operation of the heater including ignition . The only replaceable component is the 3-amp Type ATC or ATO fuse (color code: violet, PN 201685) . If the fuse is blown, the problem is most likely an external overload . Correct the problem and replace the fuse .
· Do not attempt to disassemble the control module . However, check the lead wires each heating season for insulation deterioration and good connections .
· For the flame sensor (see Figure 26 for location), disconnect the wire and remove the screw and the flame sensor . Clean flame sensor with an emery cloth before reinstalling .
· Proper operation of the direct spark ignition system requires a minimum flame signal of 1 .0 microamps as measured by a microampmeter .
CAUTION
When reassembling, the brown ground wire must remain attached to the ignitor for unit sizes 55, 85, and 110.
· For the ignitor (see Figure 26 for location), disconnect the wire and remove the screw and ignitor . Clean the ignitor assembly with an emery cloth before reinstalling .
WARNING
Due to high voltage on the spark wire and electrode, do not touch when energized.
· The spark gap (see Figure 32) must be maintained to 1/8 inch .

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UEZ-IOM (07-24) 1034347-L

Figure 32. Ignitor Spark Gap
Fan and Motor Assembly Maintenance
Inspect and clean the motor, fan guard, and blades . Remove any dirt and grease . Take care when cleaning the fan blades so as prevent causing misalignment or imbalance . Check to ensure that the hub of the fan blades is secure to the shaft . If necessary, replace the assembly as follows: 1 . If heater has been installed, turn OFF gas and disconnect electric power . 2 . Remove access panel and disconnect fan motor wi

References

• Reznor HVAC

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