Dayton 7D851A Tube Heaters Instruction Manual

Dayton 7D851A Tube Heaters

Product Information

Specifications

• Model Numbers: 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88
• Product Type: Gas-fired infrared heater
• Main Components: Burner control box, radiant tube, reflector assembly
• Installation: Suspended from the ceiling by chains
• Control: Thermostat-controlled
• Venting: Can be installed vented or unvented
• Combustion Air: May use outside air if necessary

Description

Dayton tube heaters are gas-fired infrared heaters designed to provide comfort heat. They consist of three (3) main components: a burner control box, radiant tube, and reflector assembly. The heaters are typically suspended from the ceiling by chains and controlled by a thermostat. They can be installed either vented or unvented and may use outside air for combustion if necessary. The radiant tube may be installed in different configurations depending on the heating requirements.

Installation

Important Note: This heater must be installed and serviced by trained gas installation and service personnel only!

1. Read the installation, operating, and maintenance instructions thoroughly before attempting any installation.
2. Ensure that the installation location complies with all safety requirements and clearances specified in the manual.
3. If installing in a location used for the storage of combustible materials, post signs specifying the maximum permissible stacking height to maintain required clearances from the heater to the combustibles.
4. Follow the provided instructions for suspending the heater from the ceiling using chains.
5. Connect the gas supply line to the burner control box according to local gas codes and regulations.
6. If necessary, provide outside air for combustion by following the instructions in the manual.
7. Test the installation for gas leaks using a gas leak detector or soapy water solution.

Operation

Important Note: This section provides a brief overview of the operation. For detailed instructions, refer to the operation section in the manual.

1. Ensure that the gas supply is turned on and the thermostat is set to the desired temperature.
2. The burner control box will ignite the gas and produce infrared heat.
3. The radiant tube will distribute the heat throughout the desired area.
4. The reflector assembly helps direct the heat towards the desired direction.
5. The thermostat will control the operation of the heater based on the temperature settings.

Maintenance

Important Note: Regular maintenance is essential for safe and efficient operation. Refer to the maintenance section in the manual for detailed instructions.

1. Regularly inspect the heater for any signs of damage or wear.
2. Clean the reflector assembly and radiant tube to remove any dust or debris accumulation.
3. Check and clean the burner control box, ensuring proper functioning of all components.
4. Inspect and replace any worn-out or damaged parts as necessary.
5. Perform routine checks on the gas supply line and connections for leaks.

Troubleshooting Guide

Refer to the troubleshooting guide in the manual for assistance with common issues and their solutions.

Limited Warranty

Details about the limited warranty for the product can be found in the warranty section of the manual.

FAQs

• Q: Who should install and service this heater?
  • A: This heater must be installed and serviced by trained gas installation and service personnel only.
• Q: Can this heater be installed vented or unvented?
  • A: Yes, this heater can be installed either vented or unvented.
• Q: Does this heater require outside air for combustion?
  • A: The heater may use outside air for combustion if necessary. Refer to the installation section in the manual for instructions.
• Q: How should I clean the reflector assembly and radiant tube?
  • A: To clean the reflector assembly and radiant tube, use a soft cloth or brush to remove any dust or debris accumulation.

Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Please read and save these instructions. This heater must be installed and serviced by trained gas installation and service personnel only! Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or property damage! Retain these instructions for future reference.

Dayton® Tube Heaters

Description Dayton tube heaters are gas-fired infrared heaters designed to provide comfort heat. They consist of three (3) main components: a burner control box, radiant tube, and reflector assembly. The heaters are typically suspended from the ceiling by chains and controlled by a thermostat. They can be installed either vented or unvented, and may use outside air for combustion if necessary. The radiant tube may be installed in different configurations depending on the heating requirements.
These heaters use infrared energy to heat spaces. When heat is required, the burner control box ignites a gas/air mixture and pushes the hot gases into the radiant tube. As the gases pass through the assembly, the tubing is heated and emits infrared, which is then directed toward the floor by reflectors. This is known as primary infrared and is absorbed by the floor, objects and people in the space, raising their temperatures. They in turn re-radiate this heat, known as secondary infrared, to create a comfort zone at the floor level. This is how Dayton tube heaters can heat large spaces without having to provide primary infrared for every square foot of area. However, if the goal is to spot heat a small area within a large space, only the primary infrared makes this possible. Dayton tube heaters are design certified for use in industrial and commercial buildings, such as warehouses, manufacturing plants, aircraft hangars and vehicle maintenance shops. They are not certified for residential use or where flammable gases or vapors are generally present, such as spray booths.

! WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read and understand the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.
This heater must be installed and serviced by trained gas installation and service personnel only. Failure to comply could result in personal injury, asphyxiation, death, fire and/ or property damage.

! WARNING
In locations used for the storage of combustible materials, signs must be posted to specify the maximum permissible stacking height to maintain the required clearances from the heater to the combustibles. Signs must either be posted adjacent to the heater thermostats or in the absence of such thermostats, in a conspicuous location.

For Your Safety – If you smell gas:
· Do not try to light any appliance. · Immediately call your gas supplier
from a neighbor’s phone. · Do not touch any electrical switch. · Follow the gas supplier’s
instructions. · Do not use any phone in your
building. · If you cannot reach your gas
supplier, call the fire department.

Form 5S6496

Printed in U.S.A. 03460 1109/224/VCPVP

Keep these instructions for future reference.

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Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Kit Contents Prior to installation, verify that you have received all heater components included with your tube heater. Refer to the chart below for a list of the kit contents for your model heater. Materials not included in the kit (e.g. sheet metal screws, vent material, terminals, etc.) are the responsibility of the installer.

Filled By: Part #

Description

5VD67A-
5VD70A 20 ft.

5VD71A-
5VD72A 30 ft.

5VD73A- 5EAJ0-J2, 5VD79A-80A,

5VD78A 5EAH3-H5 5EAH6-H8

40ft.

50ft.

60ft.

TP-19B

4″ Tube Hanger with Tension Spring

3

4

5

6

7

TP-21B

4″ Tube Clamp

2

3

4

5

6

TP-33B

1/2″ Shut-off Ball Valve/Inlet Tap

1

1

1

1

1

TP-82

4″ Reflector Center Support

2

3

4

5

6

TP-83

24″ Stainless Steel Flexible Gas Connector

1

1

1

1

1

TP-105

Reflector End Cap

2

2

2

2

2

TP-106

Reflector End Cap Clips

8

8

8

8

8

THCS

Tube Heater Chain Sets

5

6

7

8

9

IOM

Installation, Operation & Maintenance Manual

1

1

1

1

1

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Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

INTRODUCTION

Overview The intent of this manual is to provide information regarding general safety, installation, operation and maintenance of this tube heater. You must read and understand all instructions and safety warnings before installing or servicing the tube heater.

Available Models – Tube Heater Burner Box and Tube Reflector Combinations

Combo # 7D837A

Burner Box #
5VD67A

Tube & Reflector Pkg #
5VD88

Tube Type 20-4″-ALUM

Length 20

7D838A

5VD68A

5VD88

20-4″-ALUM

20

7D839A

5VD69A

5VD88

20-4″-ALUM

20

7D840A

5VD70A

5VD88

20-4″-ALUM

20

7D841A

5VD71A

5VD89

30-4″-ALUM

30

7D842A

5VD72A

5VD89

30-4″-ALUM

30

7D843A

5VD73A

5VD91

40-4″-ALUM

40

7D844A

5VD74A

5VD91

40-4″-ALUM

40

7D845A

5VD75A

5VD91

40-4″-ALUM

40

7D846A

5VD76A

5VD91

40-4″-ALUM

40

7D847A

5VD77A

5VD90

40-4″-TITAN

40

7D848A

5VD78A

5VD90

40-4″-TITAN

40

7AR80

5EAJ0

5VD90 & 5EAH2 40-4″-TITAN & 10-4″-ALUM

50

7AR79

5EAJ1

5VD90 & 5EAH2 40-4″-TITAN & 10-4″-ALUM

50

7AR83

5EAJ2

5VD90 & 5EAH2 40-4″-TITAN & 10-4″-ALUM

50

7AR81

5EAH3

5VD90 & 5EAH2 40-4″-TITAN & 10-4″-ALUM

50

7AR87

5EAH4

5VD90 & 5EAH2 40-4″-TITAN & 10-4″-ALUM

50

7AR85

5EAH5

5VD90 & 5EAH2 40-4″-TITAN & 10-4″-ALUM

50

7D849A

5VD79A

5VD90 & 5VD88 40-4″-TITAN & 20-4″-ALUM

60

7D851A

5VD80A

5VD90 & 5VD88 40-4″-TITAN & 20-4″-ALUM

60

7AR84

5EAH6

5VD90 & 5VD88 40-4″-TITAN & 20-4″-ALUM

60

7AR82

5EAH7

5VD90 & 5VD88 40-4″-TITAN & 20-4″-ALUM

60

7AR88

5EAH8

5VD90 & 5VD88 40-4″-TITAN & 20-4″-ALUM

60

7AR86

5EAH9

5VD90 & 5VD88 40-4″-TITAN & 20-4″-ALUM

60

BTU/H 50,000 50,000 75,000 75,000 100,000 100,000 100,000 100,000 125,000 125,000 150,000 150,000 150,000 150,000 175,000 175,000 200,000 200,000 150,000 150,000 175,000 175,000 200,000 200,000

Gas Type NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP NAT LP

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Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

SAFETY

! WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, serious injury or death. Read and understand, the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment. Only trained, qualified gas installation and service personnel may install or service this equipment.

! WARNING
Not for residential use!
Do not use this heater in the home, sleeping quarters, attached garages, etc.

Safety Symbols
Safety is the most important consideration during installation, operation and maintenance of the tube heater. You will see the following symbols and signal words when there is a hazard related to safety or property damage.

! WARNING
Warning indicates a potentially hazardous situation which, if not avoided, could result in death or injury.

Applications
This is not an explosion-proof heater. No heater may be used in a Class 1 or Class 2 Explosive Environment. Consult the local Fire Marshall, fire insurance carrier and other authorities for approval if the proposed installation is in question.

Commercial and Industrial
This tube heater is designed and certified for use in industrial and commercial buildings such as, warehouses, manufacturing plants, aircraft hangars and vehicle maintenance shops.

! CAUTION
Caution indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.

NOTICE
Notice indicates a potentially hazardous situation which, if not avoided, could result in property damage.

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Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Standards, Certifications and Governmental Regulations

The installation of this tube heater must comply with all applicable local, state and national specifications, regulations and building codes (contact the local building inspector and/or fire marshall for guidance) before installing the heater system.

In the absence of local codes, the installation must conform to the latest edition of the National Fuel Code ANSI Z223.1 (NFPA 54).

Refer to the following Standards and codes for application specific guidelines:

Public Garages: The installation of this heater in public garages must conform with the Standard for Parking Structures, ANSI/ NFPA 88A (latest edition), or the Code for Motor Fuel Dispensing Facilities and Repair Garages NFPA 30A (latest edition) and must be at least 8 ft. above the floor.
Aircraft Hangars: The installation of this heater in aircraft hangars must conform with the Standard for Aircraft Hangars, ANSI/ NFPA 409 (latest edition). The heater must be installed at least 10 ft. above the upper wing surfaces and engine enclosures of the highest aircraft which might be stored in the hangar. In areas adjoining the aircraft storage area, the heaters must be installed at least 8 ft. above the floor. The heaters must be located in areas where they will not be subject to damage by aircraft, cranes, moveable scaffolding or other objects.

High Altitude: The installation of this tube heater is approved, without modifications, for elevations up to 6,000 ft. MSL (sea level). Contact Dayton for installations above these elevations.
Electrical: The heater, when installed, must be electrically grounded in accordance with the National Electrical Code ANSI/NFPA 70 (latest edition). Under no circumstances is either the electrical supply line or gas supply line to provide any assistance in the suspension of the heater.

Venting: Venting must be installed in accordance with the requirements set forth in this manual and with the NFPA 54/ANSI Z223.1 National Fuel Gas Code (latest edition).
This unit complies with or is Certified by one or more of the following organizations or Standards:
· CSA International (CSA). · American National Standards (ANSI
Z83.20b). · National Fuel Gas Code (NFPA 54/
ANSI Z223.1). · Occupational Safety and Health Act
(OSHA).

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Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Clearance to Combustibles

! WARNING
This is not an explosion-proof heater. Do not store or use flammable objects, liquids or vapor in the vicinity of the heater. Where there is the possibility of exposure to flammable vapors or highly combustible materials, consult the local fire marshall, fire insurance carrier and other authorities for approval of the proposed installation.

! WARNING
This heater should be installed so that the minimum clearances to combustibles, as marked on the heater, will be maintained from vehicles parked below. If vehicle lifts are present, ensure that these clearances will be maintained from vehicles parked below. If vehicle lifts are present, ensure that these clearances will be maintained from the highest raised vehicle.

! WARNING
Fire Hazard. Always maintain published clearance to combustibles. Failure to comply with the stated clearances to combustibles could result in personal injury, death and/or property damage.

Hazards
For maximum safety, the building must be evaluated for hazards before installing this heating system. A critical safety factor before installation is the clearance to combustibles.
Clearances to combustibles is defined as the minimum distance that must be maintained between the tube surface or reflector and combustible materials. It also pertains to the distance that must be maintained from moving objects (e.g. overhead doors, cranes, vehicle lifts, etc.) around the tube heater.

The following is a partial list of items to maintain clearances from:
· Gas and electrical lines · Combustible and explosive materials · Chemical storage areas · Areas of high chemical fume
concentrations · Vehicle parking areas · Vehicle lifts · Hoists or cranes · Storage areas with stacked materials · Lighting · Sprinkler heads · Overhead doors and tracks · Dirty, contaminated areas

If you are unsure about the proposed installation, consult your local fire Marshall, fire insurance carrier or other qualified authorities for the approval of the proposed installation.
Safety Signs and Labels It is important to provide warnings to alert individuals to potential hazards and safety actions. ANSI Z83.20b and CSA 2.34, require you to post a sign “specifying the maximum permissible stacking height to maintain the required published clearances from the heater to combustibles” near the heater’s thermostat or, in the absence of such thermostats, in a conspicuous location.

All safety labels must be maintained on this appliance. Contact Grainger if replacement labels are needed.

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Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Clearance to Combustibles
For the safe installation of this unit, the clearance to combustibles data below (Figure 1.1) contains clearances that must be maintained. Check the heater’s rating plate to verify the minimum clearance to combustibles and gas type for your model heater.

Figure 1.1 · Clearances to Combustibles Data

0° Mounting

Angle

Top

Side

Side

Below

45° Mounting

Top

Angle

Front

Behind

Below

0° w/ 1

Top

Side Shield

Front

Behind

Below

0° W/ 2 Side Top Shields

Side

Side

Below

Mounting

Side

Model No.

Angle * Front Behind Top Below

Dayton – 5VD67A, 5VD68A (20′ min. to 40′ max.)

50,000 BTU/H [N, P]

0°

9

9

6

47

7D – 837A,838A

45°

39

8

10

47

0° w/ 1 side shield

0°

29

8

6

47

0° w/ 2 side shields

0°

9

9

6

47

20 ft. from burner

0°

7

7

6

30

Dayton – 5VD69A, 5VD70A (20′ min. to 40′ max.)

75,000 BTU/H [N, P]

0°

9

9

6

60

7D – 839A,840A

45°

39

8

10

60

0° w/ 1 side shield

0°

29

8

6

60

0° w/ 2 side shields 20 ft. from burner

0°

9

9

6

60

0°

7

7

6

30

Dayton – 5VD71A, 5VD72A, 5VD73A, 5VD74A (30′ min. to 40′ max.)

100,000 BTU/H [N, P]

0°

14

14

6

66

7D – 841A,842A,843A,844A

45°

39

8

10

66

0° w/ 1 side shield

0°

29

8

6

66

0° w/ 2 side shields

0°

16

16

6

66

20 ft. from burner

0°

7

7

6

30

Dayton – 5VD75A, 5VD76A (40′ min. to 60′ max.)

125,000 BTU/H [N, P]

0°

20

20

6

76

7D – 845A,846A

45°

58

8

10

76

0° w/ 1 side shield

0°

42

8

6

76

0° w/ 2 side shields

0°

20

20

6

76

20 ft. from burner

0°

7

11

6

30

Dayton – 5VD77A, 5VD78A, 5VD79A, 5VD80A, 5EAJ0, 5EAJ1 (40′ min. to 60′ max.)

150,000 BTU/H [N, P]

0°

24

24

6

81

7D-847A,848A,849A,851A, 7AR-79,80

45°

58

8

10

81

0° w/ 1 side shield 0° w/ 2 side shields

0°

42

8

6

81

0°

23

23

6

81

20 ft. from burner

0°

11

11

6

44

Dayton – 5EAJ2, 5EAH3, 5EAH6, 5EAH7 (50′ min. to 60′ max.)

175,000 BTU/H [N, P]

0°

34

34

6

92

7AR – 81, 82, 83, 84

45°

63

8

10

92

0° w/ 1 side shield

0°

50

8

6

92

0° w/ 2 side shields

0°

30

30

6

92

20 ft. from burner

0°

11

11

6

44

Dayton – 5EAH4, 5EAH5, 5EAH8, 5EAH9 (50′ min. to 60′ max.)

200,000 BTU/H [N, P]

0°

41

41

6

94

7AR – 85, 86, 87, 88

45°

63

8

10

94

0° w/ 1 side shield

0°

54

8

6

94

0° w/ 2 side shields

0°

30

30

6

94

20 ft. from burner

0°

11

11

6

44

Minimum end clearance for all models is 12 inches. *Heaters mounted on an angle between 0°

to 45° must maintain clearances posted for both 0° and 45° mounting angles; whichever is greater.

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Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Installation

Design Considerations and Prechecks

Placement of infrared tube heaters is influenced by many factors. Aside from safety factors, considerations such as the number of elbows that are allowed, maximum vent lengths, ducting of combustion air and combining vents are a few examples. This manual, along with national, state

and local codes, addresses these issues. It is critical that all guidelines and instructions are followed.
To ensure a properly designed heating system, a heating layout should be developed for the correct placement of the burner control box, radiant

tubing, venting and combustion air intake ducts. Inspect and evaluate the mounting conditions, vent locations, gas supply and electrical wiring. Refer to the chart below for the recommended distances for the model being installed.

Heater Installation Chart

Model # 7D837A-7D838A 7D839A-7D840A 7D841A-7D844A 7D845A-7D846A 7D847A-7D851A, 7AR79-7AR80 7AR81-7AR84 7AR85-7AR88

BTU/H 50,000 75,000 100,000 125,000
150,000
175,000 200,000

Recommended Mounting Heights
9′ to 14′ 11′ to 18′ 13′ to 23′ 14′ to 25′

Distance Between Heaters 10′ to 20′
20′ to 30′
20′ to 30′
20′ to 30′

15′ to 35′

30′ to 40′

17′ to 35′ 18′ to 40′

30′ to 40′ 30′ to 40′

Distance Between Heater Rows 20′ to 40′
30′ to 50′
30′ to 50′
30′ to 50′

Maximum Distance Between Heater and Wall
16′
20′
20′
25′

40′ to 60′

25′

40′ to 60′

30′

40′ to 60′

30′

When designing an infrared radiant heating system, consider the following:

• Has the building’s heat loss been evaluated?
  · Does the design meet the needs of the space?
  · Have all clearance to combustible situations been observed?
  · Have recommended mounting heights been observed?
  · Is the supply (burner) end of the heater located where more heat is required?
  · Is it best to offset the heaters and/ or rotate the reflectors towards the heat zone?

• Are protective guards, side shields, U’ orL’ reflector covers needed?
  · Does the heater require outside fresh air for combustion?
  · Is the environment harsh or contaminated (requiring outside air for combustion)?
  · Are chemicals or vapor a concern (requiring outside air for combustion)?
  NOTE: The effective infrared surface temperature of a person or object may be diminished with wind above 5 mph. The use of adequate wind barrier(s) may be required.

NOTE: When heated, materials high in hydrocarbons (solvents, paint thinner, mineral spirits, formaldehydes, etc.) can evaporate. This may result in odors or fumes being emitted into the environment. To correct this problem, clean the area and/or introduce additional ventilation.
Heaters installed and serviced in accordance with the installation manual do not emit odors into the environment. See notice on page 28 additional information.

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Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Design Scenario
A tube heater system is being installed in 70′ (L) x 40′ (W) space with 12′ ceilings. Two overhead doors are located at one end and an equipment storage area exists on one side. The calculated heat load is 300,000 BTU/H.

Figure 2.1 · Poor Design
· Two burners (150,000 BTU/H each) are placed at one end, opposite the area of highest demand (overhead doors).
· Recommended mounting heights are not observed.
· Produces an uneven heat distribution.

Doors and tracks
Too Cold
Doors and tracks

70′ Gas Supply

60′ – 150,000 BTU (2 total)

Equipment storage

Too Hot

40′

Poor Design

Figure 2.2 · Good Design
· Four burners (75,000 BTU/H each) are placed in each corner. Burner (hotter) ends direct heat to areas of highest head demand.
· Recommended mounting heights observed.
· Distributes heat more evenly.

Doors and tracks
Doors and tracks

70′ Gas Supply

Equipment storage

20′ – 75,000 BTU (4 total)

Better Heat Distribution

40′

Good Design

Sidewall Vent (2 total)

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Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Recommended Mounting Heights

Model BTU Range Recommended Mounting Heights Coverage Straight Config. (LxW) Coverage U-Tube Config. (LxW) Distance Between Heater Rows (Ft.) Dim. A Distance Between Heater Rows (Ft.) Dim. B Max. Distance Between Heaters and Wall (Ft.) Dim C

20 ft.

50 MBH

10′ – 16′

20′ x 12′

12′ x 12′

10′ – 20′

20′ – 40′

16′

75 MBH

12′ – 20′

22′ x 15′

12′ x 12′

20′ – 30′

30′ – 50′

18′

30 ft. 100 MBH

13′ – 20′

33′ x 18′

N/A

20′ – 30′

30′ – 50′

20′

40 ft. 100-125 MBH 13′ – 25′

44′ x 21′

23′ x 17′

20′ – 30′

30′ – 50′

20′

150 MBH

16′ – 30′

45′ x 26′

24′ x 20′

30′ – 40′

40′ – 60′

25′

50 ft. 150-200 MBH 16′ – 30′

56′ x 30′

N/A

30′ – 40′

40′ – 60′

25′

60 ft. 150-200 MBH 17′ – 40′

67′ x 34′

34′ x 26′

30′ – 40′

40′ – 60′

25′

NOTE: Factory recommended mounting heights are listed as a guideline. If infrared heaters are mounted to low or to high, they may result in heat discomfort or lack of heat. It is generally recommended to

observe the recommended mounting heights to optimize comfort conditions. However, certain applications such as spot heating, freeze protection, outdoor patio heating or very high ceilings may result in the heaters

being mounted outside of the factory recommended mounting heights. Clearances to combustibles must always be maintained.

Figure 2.3 · Recommended Mounting Heights and Distances – see chart above for dimensions.

Dimension B Distance between heater rows

Dimension A Dimension A

Dimension C Maximum distance between heater and wall

Dimension C Maximum distance between heater and wall

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Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Hanger Placement and Suspension

Suspension of the heater must conform to applicable codes referenced in the Safety section and these instructions.
1. Lay radiant tubing out in the following order. Position tubes in their approximate locations. Figure 2.4.
· 10 ft. primary combustion chamber.
· Radiant emitter tubes.

2. Mark locations for hanging points. Figure 2.4 Chart.
   NOTE: If the available hanging points do not allow for the recommended spacing (or if an alternative hanging method is utilized) then additional hangers may be necessary.
   · The spacing between the burner control box mounting brackets and the first hanger should be approximately 2′-4″.

IMPORTANT! 150 MBH models must use the 10 ft. titanium alloy treated combustion chamber as the first tube connected to the burner control box. The combustion chamber has an orange identification sticker located on the swaged end of the tube.

• The space between the first two hangers placed on the first tube should be approximately 8′-10″.
  · The space between hangers thereafter, one per tube, should be approximately 9′-8″.

! WARNING
Failure to maintain the published clearance to combustibles may result in fire and/or explosion, property damage, serious injury or death. Always maintain clearances and post signs where needed.
! WARNING
Improper suspension of the heater may result in collapse and being crushed. Always suspend the appliance from a permanent part of the building structure that can support the total weight and force of the heater.

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Dayton® Tube Heaters

Hanger Placement and Suspension Figure 2.4 · Heater Suspension Layout
NOTE: A sticker identifying the combustion chamber(s) is located on the swaged end of the tube(s).

Burner Control Box Hanging Points

Hanging Point

8′-10″

Hanging Point

Hanging Point
9′-8″
9′-8″ Radiant Emitter Tube(s)
Radiant Emitter Tube

2′-4″ 16″ Burner
Tube

10 ft. Primary Combustion Chamber

Igniter/Sensor Box Burner Control Box
Heater Mounting Requirements and Weights

Model Dimension Straight Config. Hanging Points Control Box Hanging Points Shipping Weight Chain Set Qty. Straight Config. Chain Set Qty. U-Tube Config. Optional Brass Knuckles (P/N: 5VD54) Optional Single Mount Bracket (P/N: 5VD85) U Config. Only.

20 ft.

21′-8″

3

30 ft.

31′-4″

4

40 ft.

41′-0″

5

50 ft.

50′-8″

6

60 ft.

60′-4″

7

2

120 lbs.

5

6

3

2

2

160 lbs.

6

N/A

4

N/A

2

190 lbs.

7

8

5

3

2

235 lbs.

8

N/A

6

N/A

2

265 lbs.

9

10

7

4

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Dayton Installation, Operation, Maintenance and Parts Manual
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Heater Placement and Suspension

Suspension of the heater must conform to applicable codes referenced in the Safety section and these instructions.
3. Prepare the mounting surface. If necessary, weld blocks, drill holes, etc. Figure 2.5. NOTE: The burner control box and radiant tubes should be in straight alignment and level.

4. Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.
   5. Attach and close S-hook and #1 double-loop chain to anchor. Check that it is securely attached. NOTE: Threaded rod and turnbuckles may be used.

5. Attach hangers to chains. Adjust chain lengths until radiant tubing is level and equal weight distribution is achieved.
   NOTE: Chains must be straight up and down. Do not install chains at an angle as this can result in tube warpage or separation.

Figure 2.5 · Mounting the Hangers
3. I-Beam 4. Beam Clamp 6. Threaded Rod
5. Threaded Rod and Turnbuckle

3. I-Beam 4. Beam Clamp
   5. S-hook and #1 double-loop chain
   6. Chain

4. Concrete Beam
   4. Screw Hook

5. Chain

6. Screw hook
   with locknut
   and washer

7. Wood Beam
   6. Chain

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Dayton® Tube Heaters

Optional U-Bend or Elbow Accessory Configuration Figure 2.6 · U-Tube Hanger Mounting Options

Single Mounting Bracket

Brass Knuckle

Exhaust End

U-Tubes can be mounted from a single suspension point using a Single Mounting Bracket (P/N: 5VD85) with five S-hooks and #1 double-loop chains.
Figure 2.7 · Angled Hanger Mounting Options

U-Tubes can be mounted at a 15°, 30° or 45° angle with two suspension points, using two Brass Knuckle (P/N: 5VD54) fittings, #1 double-loop chains and S-hooks.

45° 30° 15°

For 45° hanging angle use two S-hooks and two #1 double-loop chains.

For variety of hanging angles, use the Brass Knuckle (P/N: 5VD54) fitting with a #1 double-loop chain and S-hook.

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Radiant Tube Assembly To install the radiant tubes:
1. Place tubes in hangers with the welded seam facing downward and the swaged end of the tube towards the exhaust end of the heater system. Figure 2.8.
Refer to Figure 2.20 on page 22 for tube installation sequence. Figure 2.8 · Attach Hangers

Swaged end

Hanger

Radiant tube

Welded seam faces down

2. Slide tube clamps onto radiant tubes. Figure 2.9. Figure 2.9 · Attach Tube Clamps
   Concave surface

Tube clamp

NOTE: If the tube clamp comes apart, the spacer must be reassembled with the spacer’s concave surface facing against the radiant tube surface.
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Dayton® Tube Heaters

Radiant Tube Assembly

3. Slip-fit the radiant tube sections together until tightly connected (install swaged end of each tube towards exhaust end). NOTE: If it is difficult to mate the tubes, they may be installed incorrectly.
4. Center tube clamps over the seams where two radiant tube sections connect. If necessary, rotate tube clamps so they will not interfere with the reflector end caps during expansion and contraction of the heater while operating.
5. Tighten tube clamp bolts to secure. When proper compression is obtained (40-60 ft-lbs. torque), the tube seam will create a visible mark on the tube clamp. NOTE: Excessive torque may damage the tube clamp.
6. Determine the location of the burner control box and note the placement of the mounting chains.

The tube clamp is tight when proper torque is achieved (normally when seam becomes visible).

• A maximum of one 180° U-bend or two 90° elbows can be installed on a heater.
  · Omit one 36″ section of turbulator baffle. Refer to Baffle Assembly section.
  Optional U-Bend or Elbow Accessory Configurations
  Figure 2.11 · Optional Tube Connections

Tubes are not fit snuggly together and the tube clamp is not centered over the seam.

90 Degree Elbow Bend (P/N: 3TZ71)

Incorrect Tube Connection

Figure 2.10 · Tube Connections Tubes fit snuggly together and the tube clamp is centered over the seam.
Correct Tube Connection

A 180 degree U-bend or 90 degree accessory fitting may be installed in the radiant tube heater system. Refer to chart on page 17 for minimum distance requirements from the burner control box.
When installing a U-bend or Elbow Accessory Fitting:
· The top clearance of an uncovered (no reflector) U-bend or elbow accessory fitting to combustibles is 18″.
· If operating the heater un-vented, separate the intake air to the heater from its exhaust products a minimum of 4′; further separation may be necessary. Combustion air may also be supplied.

180 Degree U-Bend
(P/N: 3F835)

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Dayton Installation, Operation, Maintenance and Parts Manual
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Radiant Tube Assembly Figure 2.12 · Elbow and U-Bend Clearances
Dimension A

Elbow can be set in both directions

Tube Clamp

Tube Clamp

Dimension A

U-Bend can be set in both directions

Tube Clamp 8″

12″ Dimension B

Figure 2.13 · U-Bend and Elbow Dimensions
16″ 6″

Tube Clamp
12.5″

16″

20″

12.5″

P/N: 3TZ71

10″ 20″

P/N: 3F835

Minimum Distance from Burner Control Box to U-Bend or Elbow Accessory

Models 50-100 MBH

Dimension A 10 ft.

125 MBH 150-175 MBH
200 MBH

15 ft. 20 ft. 25 ft.

Overall Dimensions for Heaters Configured with U-Bend (P/N: 3F835)

Model 20 ft. 30 ft. 40 ft. 50 ft. 60 ft.

Dimesion B 13′-0″ N/A 22′-8″ N/A 32′-4″

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Dayton® Tube Heaters

Burner Control Box Suspension

Suspending the burner control box must be done in accordance with applicable codes listed in the Safety section and these instructions.
The burner control box must be in straight alignment with the radiant tubes and level.
1. Determine the mounting chain locations for hanging the burner control box.
2. Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.
3. Attach and close S-hook and #1 double-loop chain to anchor. Check that is securely connected.
4. Attach chain assemblies and S-hooks to mounting brackets on the burner control box. Adjust chain lengths until level and in straight alignment with the radiant tubes. The burner sight glass will be visible from the floor.

Figure 2.14 · Burner Control Box Assembly · Side View
1 2 3

Burner Control Box tube is in

straight alignment with 10′

4

Primary Combustion Chamber

8.1″

Burner Sight Glass

12″

(bottom side of the tube)
16″

Figure 2.15 · Burner Control Box with U-Bend · End View
29.6″ 16″

8.1″

3.5″

3″

5.5″

5″

18″

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Dayton Installation, Operation, Maintenance and Parts Manual
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Reflector Assembly

To install the reflectors:
1. Attach reflector center supports onto radiant tubes.
2. Slide each reflector section through the hangers and adjust the reflector tension spring into the V-groove on the top of the reflector. The reflectors should overlap approximately 4″.

3. To prevent the reflectors from shifting, secure the reflector sections together using sheet metal screws except at the expansion joint. Figure 2.18. NOTE: Installer to provide sheet metal screws.
   4. Attach reflector end caps, with polished side inward, to each end of the reflector run.

Reflectors, and reflector accessories, direct infrared energy to the floor level. The reflector assembly depends on the heater configuration, proximity to combustibles and the space surrounding the heater.
Before you begin assembly, determine if the use of reflector accessories are necessary. Figure 2.17.

Figure 2.16 · Reflector Assembly
Reflector Center Support
Hanger Radiant and Chain Tube

Reflector

Place at the mid-point of the tube

Reflector Tension Spring

4″ Overlap

Reflector End Cap

Clips

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Dayton Installation, Operation, Maintenance and Parts Manual

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Dayton® Tube Heaters

Reflector Assembly

Common Optional Accessories

Reflector Accessories

Description

Part #

Elbow Reflector*

90° bend, highly polished aluminum reflector elbow. Designed to fit atop one 5VD83 elbow accessory fitting.

U-Reflector*

180° bend, highly polished aluminum reflector U-bend. Designed to fit atop one U-bend accessory fitting.

5VD84

Side Shield Reflector *^

Highly polished side shield extension used to direct infrared rays downward, away from side walls and combustibles.

5VD86

Protective Guard

Used to prevent debris or objects from becoming lodged between the radiant 5VD81 tube and reflector. Required when mounting heaters below 8 ft.

• Reflectors cannot be rotated when used with this accessory. ^ Refer to the Clearance to Combustibles chart on page 7 for minimum distances to combustibles when side shield
  extension(s) are used.

Additional accessory options are available in the W.W. Grainger catalog.

Figure 2.17 · Reflector Shield Accessories
Elbow reflector (P/N: 5VD83) Used over a 90-degree elbow radiant tube.

U-shaped reflector (P/N: 5VD84) Used over a `U-shaped radiant tube.

Side shield extension (P/N: 5VD86) Directs infrared rays downward, away from sidewalls and combustibles.
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Dayton Installation, Operation, Maintenance and Parts Manual
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Baffle Assembly and Placement

To assemble the baffles: NOTE: Baffles may be inserted into the tube while being assembled.

2. Install the baffle tabs at a 90° angle to the baffle keyhole. Figure 2.18.
3. Adjust the tabs to the center of the keyhole and rotate the baffle 90° to lock the baffle sections together.
4. Determine the number of baffles needed for your model number. Remove one 36″ baffle section if heater is installed with an elbow or U-bend accessory.
5. Insert one baffle tab into keyhole and slide completely to one side until both baffle tabs appear in the keyhole.
6. Repeat this process with remaining baffle sections to complete assembly.

Figure 2.18 · Assembling the Baffles

Baffle keyhole Baffle tabs

2

3

4

To insert the baffles:

Completed connection

1. Insert baffles with the keyhole end first.
   2. Rotate baffle assembly so that it is in the vertical position.

2. Slide baffle assembly into the last radiant tube section, furthest from burner control box.

NOTE: Baffle assemblies longer than 10′ will continue to be fed into next tube section.

Figure 2.19 · Inserting the Baffles

1

2

3

IMPORTANT: Baffle assembly must be flush with the end of the last tube

section and in the vertical position.

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Dayton® Tube Heaters

Final Heater Assembly
NOTICE
Different inputs and models utilize different baffle lengths. Remove all enclosed baffle sections from box and retain with applicable heater. Reference shipping label for proper baffle size.
Each 36″ baffle section must be assembled with other baffles and placed in the radiant tube section furthest from the burner. Important: Omit one section of baffle if heater is configured with a U-bend or Elbow accessory fitting.

Figure 2.20 · Secured Reflector Joints and Baffle Location 20 Foot 30 Foot 40 Foot

Key
Burner Control Box with 16″ Burner Tube
Expansion Joint on Reflectors
Secured Joint on Reflectors
Primary Combustion Chamber Tube with Clamp Radiant Tube with Clamp
Baffle Location

50 Foot

60 Foot

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Dayton Installation, Operation, Maintenance and Parts Manual
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Venting

! WARNING
Insufficient ventilation and/or improperly sealed vents may release gas into the building which could result in health problems, carbon monoxide poisoning or death.
Improper venting may result in fire, explosion, injury or death.
Seal vent pipes with high temperature sealant and three (3) #8 sheet metal screws. Vent enclosed spaces and buildings according to the guidelines in this manual and applicable national, state, provincial and local codes.

The heating system may operate either vented or un-vented (see page 27). Venting can terminate through the sidewall (horizontal) or the roof (vertical) and be individually or commonly vented.
Follow these guidelines and all applicable codes for all models, prior to installing vent material. Local codes may vary. In the absence of local codes, refer to the National Fuel Code ANSI Z223.1 (NFPA 54) latest edition or the National Standards of Canada.

Venting Requirements
· 4″ single wall galvanized steel vent pipe or Dura/Connect single wall flexible exhaust vent must be used.
· Seal single wall vent with high temperature sealant and three (3) #8 sheet metal screws.
· Single wall galvanized vent pipe must be insulated in cold environments.
· Do not use more than two 90° elbows in the exhaust vent.

• To maintain clearances to combustibles, the use of an approved wall or roof thimble and double-wall Type B-vent is required for the portion of vent pipe that runs through combustible material in the building wall or roof (see figures 2.21 & 2.22).
• The maximum vent length is 20′.

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Dayton® Tube Heaters

Vent Assembly Figure 2.21 · General Vent Requirements:
Vent Cap

Storm Collar Adjustable Roof Flashing 1 in. minimum clearance 1 in. minimum clearance
B to C Adapter

24 in. Min.*

Roof*
Double-wall B Vent Firestop Spacer
Heater

Single-wall Elbow or Alternate Tee Fitting

Single-wall Vent (field supplied)
*Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12

Figure 2.22 · Sidewall Venting Requirements

Building Overhang
Sidewall Vent Cap
Wall Thimble

36 in. min. 6 in.
min.

Sidewall B to C Adapter

Double-wall Single

B-Vent

Wall Vent

1/4 in. downward pitch per foot

Heater

Sidewall Venting Guidelines:
· To prevent moisture from entering the heater system, slope the vent pipe down toward the outlet 1/4″ per foot of length. Do not pitch the heater.
· Vent must extend beyond any combustible overhang.

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Dayton Installation, Operation, Maintenance and Parts Manual
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Vent Assembly
Vent Termination
· Vent must terminate a minimum of 4′ (1.2m) below, 4′ (1.2m) horizontally from or 12″ (30 cm) above any window or door that may be opened and gravity air inlet into the building.
· Vent must terminate a minimum of 3′ (.9m) above any forced air inlet that is located within 10′ (3.1m).

• The bottom of the vent terminal must be located a minimum of 12″ (30 cm.) above grade level and must extend beyond any combustible overhang. Vents adjacent to public walkways must terminate a minimum a 7′ (2.1 m) above grade level.
  · The vent cap must be a minimum of 6′ (15.2 cm) from the sidewall of the building.

• The vent terminal must be installed to prevent blockage by snow and protect building materials from degradation by flue gases.
  · Vents must extend beyond any combustible or be a minimum of 36″ below a combustible overhang.

Roof Venting
Guidelines: · Separate air intake duct from vent
pipe a minimum of 4′ (1.2 m) by placing vent pipes higher than adjacent air intake duct.

• Venting may utilize a standard B-vent cap.
• The vent terminal must extend a minimum of 2′ (.6 m) above the roof.

Figure 2.23 · Rooftop Venting – Side View

Vent Cap Roof
B to C Adapter Single-wall Elbow or Alternate Tee Fitting

24 in. Min. Roof
Double-wall B Vent Pipe Firestop Spacer
Heater
Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.

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Dayton® Tube Heaters

Vent Requirements
Common Venting

Figure 2.24 · Common Rooftop Venting – Side View

• A dual exhaust assembly (P/N: 3F817) must be used when joining two heaters to a common vent so that byproducts of one heater do not flow into the adjoining vent of the other heater.
  · 6″ diameter double-wall B-vent and 6″ vent cap must be used.
  · Common vented heaters must be controlled with the same thermostat. Do not operate individually.

Rooftop Vent Cap Double-wall B Vent

24 in. Min.*
Roof

Firestop Spacer Heater

Heater

Dual Exhaust Assembly

*Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.

Figure 2.25 · Common Sidewall Venting – Top View

Sidewall 6 in. min.

B To C Adapter

Heater

Sidewall Vent Cap Wall Thimble Double-wall B-Vent Single Wall Vent

Dual Exhaust Assembly Heater

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Dayton Installation, Operation, Maintenance and Parts Manual
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Optional Unvented Operation
When installing in an un-vented configuration:

• A factory supplied vent cap/diffuser (P/N: 3F839) must be used.
  · Ventilation of the space is required to dilute the by-products of combustion. Sufficient displacement of fresh air intake and exhaust byproduct must be provided.
  · The minimum clearance between the air intake and the exhaust terminal is 4′. NOTE: When installing in a U-bend configuration, use caution to separate vent gases from heater intake.

• A minimum positive air displacement (movement) of 4 ft3/1000 Btu/hr input of installed heaters is required.
  NOTE: Gravity or mechanical means may be used to accomplish the air displacement. Local codes may require that the mechanical exhaust system be interlocked with the electrical supply line to the heaters, enabling both to function simultaneously.
  · The use of combustion air intake is recommended.

! WARNING
Not for residential use. The use of unvented tube heaters in residential indoor spaces may result in property damage, serious injury or death. Use unvented operation in commercial and industrial installations with proper ventilation rates only.

Figure 2.26 · Minimum end clearance for unvented heater

1231″0mm

12″

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Dayton Installation, Operation, Maintenance and Parts Manual

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Dayton® Tube Heaters

Combustion Air Requirements

NOTICE
This heater has a factory preset air orifice for proper combustion air supply. If using combustion air intake from indoors, the required volume of the space must be a minimum of 50 ft3/1000 Btu/hr of installed heater input unless the building is of unusually tight construction. If the building has air infiltration rates of less than 0.40 air changes per hour, outside combustion air is typically needed unless the sheer size of the building allows otherwise.
Non-contaminated air for combustion must be ducted to the heater if chlorinated or fluorinated contaminants, high humidity and other contaminants such as sawdust or welding smoke are present in the area where the heater is installed, or if the building has a negative pressure.

Figure 2.27 · Vertical Outside Air Supply for Single Heater Side View
Roof Intake Cap
Roof 18″ Min.

4″ pipe

Flexible Air Inlet Boot

Burner Control Box

Figure 2.28 · Horizontal Outside Air Supply for Single Heater Side View
Flexible Air Inlet Boot

Air Intake Cap

4″ pipe Wall

Burner Control Box

Combustion air intake may be located on either the sidewall or the roof. Figures 2.27 – 2.29.

Figure 2.29 Vertical Outside Air Supply for Common Heater · Side View

Note: Common intake heaters

Roof Intake Cap

must share the same thermostat.

18″ Min.

6″ pipe

Flexible Air Inlet Boot

Roof
Burner Control Box

4″ pipe

4″ pipe

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Dayton Installation, Operation, Maintenance and Parts Manual
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Combustion Air Requirements

Guidelines:

General Requirements · No more than two 90° elbows are
allowed.
· Allow for expansion. Use a 4″ flexible hose to connect the duct to the burner control box.
· Do not draw air from attic space.

• In humid environments, use insulated duct, PVC pipe or DWV (drain waste vent) to prevent condensation on the outer surface.
  · Separate air intake duct from vent pipe a minimum of 4′. Also, place pipe higher than adjacent air intake duct.

• A factory approved wall intake cap (P/N: 3F837) must be used with horizontal outside intake ducts. The wall intake cap (P/N: 3F837) must be installed to prevent blockage. Locate the intake where dirt, steam, snow, etc. will not contaminate or clog the intake screen.

Limitations for length and size of combustion air intake duct

Single Heater Intake

Air Intake Duct Size

Max. Intake Length

Dual Heater Intake

Duct Size

Max. Intake Length

4 in.

20 ft.

4 in.(single)/6 in.(dual)

20 ft.

5 in.

30 ft.

4 in.(single)/8 in.(dual)

30 ft

6 in.

40 ft.

Consult factory for longer intake lengths.

Figure 2.30 · Combustion Air Intake

Air Intake Cap

Burner Control Box

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Dayton® Tube Heaters

Gas Supply

! WARNING
Improperly connected gas lines may result in fire, explosion, poisonous fumes, toxic gases, asphyxiation or death. Connect gas lines in accordance to national, state, provincial and local codes.

IMPORTANT! Before connecting the gas supply to the burner control box:
· Verify that the heater’s gas type (as listed on the rating plate) match that of your application.
· Check that the gas piping and service has the capacity to handle the total gas consumption of all heaters being installed, as well as any other gas appliances being connected to the supply line.
· Check that the main gas supply line is of proper diameter to supply the required fuel pressures.

• If utilizing used pipe, verify that its condition is clean and comparable to a new pipe. Test all gas supply lines in accordance with local codes.
  · Test and confirm that inlet pressures are correct. Refer to the rating plate on the burner control box for required minimum and maximum pressures (see chart below). The gas supply pipe must be of sufficient size to provide the required capacity and inlet pressure to the heater (if necessary, consult the local gas company). Do not exceed the maximum allowed pressure for the heater, the space or the gas piping system.

Manifold Pressure
Type of Gas Natural
Liquefied Petroleum

Required Manifold Pressure
3.5 Inches W.C.
10.0 Inches W.C.

Minimum Inlet Pressure
5.0 Inches W.C.
11.0 Inches W.C.

Maximum Inlet Pressure
14.0 Inches W.C.
14.0 Inches W.C.

Note: Check manifold pressure at the tap on the gas valve. Readings will be above atmospheric pressure.

Pressure Equivalents: 1 Inch W.C. = .058 oz/sq. in. = 2.49 Mbar

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Dayton Installation, Operation, Maintenance and Parts Manual
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Gas Connection To connect the gas:

! WARNING
Failure to install, operate or service this appliance in the approved manner may result in property damage, injury or death. Only trained, qualified gas installation and service personnel may install or service this equipment.
This heater must be installed and service by trained gas installation and service personnel only.
The installation must conform with local building codes or, in the absence of such codes, the National Fuel Code (NFPA 54) and in conjunction with ANSI Z21.24/CSA 6.10 “Connectors for Gas Appliances”.
IMPORTANT! The heating system will expand and contract during operation. Allowances for expansion must be made between the connection to the heater and the gas supply. Excessive bending, kinks, twists or vibration must be avoided. A flexible gas connection of approved type is required. Flexible stainless steel gas connectors installed in one plane, and without sharp bends, kinks or twists is recommended.

The gas pipe and connection must be supported independently. Do not install gas supply line in a manner that bears the weight of the heater. Connect the main gas supply line with an approved flexible connector (Figures 2.31 & 2.32) or, if national or local codes require rigid piping, a swing joint. See the safety messages at the beginning of this section.
The gas outlet must be in the same room as the appliance and accessible. It may not be concealed within or run through any wall, floor or partition. When installing the heater in a corrosive environment (or near corrosive substances), use a gas connector suitable for the environment. Do not use the gas piping system to electrically ground the heater.

1. Install a sediment trap / drip leg if condensation may occur at any point of the gas supply line. This will decrease the possibly of loose scale or dirt in the supply line entering the heater’s control system and causing a malfunction.
   NOTE: High pressure gas above 14 Inches W.C. (water column pressure) requires a high pressure regulator and ball valve.
   2. Form the stainless steel flexible connector into a smooth C-shape allowing 12 in. between the flexible connector’s end nuts. Figure 2.31.
   3. Attach the ball valve to the gas supply pipe. Apply pipe compound to NPT adapter threads to seal the joint. Use only a pipe compound resistant to LP.
   NOTE: Provide a 1/8 in. NPT plugged tapping accessible for test gauge connection immediately upstream of gas connection to the heater (provided on ball valve).

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Gas Supply

4. Attach the flexible connector to the adapter and burner control box inlet. Seal the joints.

Figure 2.31 · Flexible Gas Connection Side View Ball Valve / Inlet Tap

NOTE: Excessive torque on the manifold may misalign the orifice. Always use two wrenches to tighten mating pipe connections.
5. Final assembly must be tested for gas leaks according to NFPA or local codes.

Adapter
Drip Leg/ Sediment Trap 2″ max displacement 12″

! CAUTION
When using a stainless steel flexible connector, do not attach the connector nuts directly to the gas pipe supply. Connector nuts must be installed to an approved adapter.

Heater Movement

Burner Control Box

Adapter
Stainless Steel Gas Connector, formed into smooth C-Shape

! WARNING
Testing for gas leaks with an open flame or other sources of ignition may lead to a fire or explosion and cause serious injury or death. Test in accordance with NFPA or local codes.

Figure 2.32 · Flexible Gas Connection End View Ball Valve/Inlet Tap

Stainless Steel Gas Connector

45° 45°

Horizontal
Burner Control Box Remove cap to clean sediment trap

32
t

Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Electrical Requirements

• Verify that the heater’s voltage (as listed on the rating plate) matches that of your application.
  · Heaters operate on 120 volts, 60Hz., single phase. The maximum amperage requirement is 4.8 amps starting current; 1.1 amps running current per heater.
  · Observe proper electrical polarity.

• The heater must be grounded in accordance with the National Electrical Code ANSI/NFPA70 (latest edition).

• Clearance to combustibles must be maintained between electrical apparatus and wiring. See clearance data on page 7.

• It is recommended that the thermostat be installed on the hot side of a fused supply line and have sufficient amp rating for the heater(s) that it controls.

• Wiring must not be run above or below the heater or exposed to the radiant output.
  · Installations utilizing a 24 volt thermostat require a relay transformer. Figure 2.34.

Figure 2.33 – Field Wiring 120V Connection(s)

L1 Neutral

Heaters on the same vent must share the same thermostat.
T

NOTE: Up to 4 line voltage tube heaters can be wired to most thermostats.
Additional heaters

Ground
120V-60 Hz. Supply

Burner Box

Multiple Burner Box (if applicable)

Figure 2.34 – Field Wiring 24V Thermostat Connection

Common required for thermostats that require constant power.

1/4″ spade terminals required (field supplied)

Common

COM 24V

Burner Control Box w/ 24VAO

W

COM 24V

Burner Control Box

w/ 24VAO

R

–

24V

24V Digital Thermostat

120 V

COM 24V

Burner Control Box w/ 24VAO

External

L1

Transformer (field suppied)

120 Volt Power (Observe polarity) N

33
t

Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Internal Wiring Diagrams
If any of the original wire as supplied with this appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C.

Figure 2.35 · Ladder Diagram: Mark 17DU-117 with Lights

L1 120VAC

N

BK

Blower

BK

BK

Indicator Lights

BK

BK

BK

BK

Gas Valve

Pressure Switch

BK
Ignitor

BK W
BR

Flame Rod

PROBE SIC1 LINE1 TH NEUT VALVE NEUT GND

O

BK

R

W

G
Ignition Module

Figure 2.36 · Block Diagram: Mark 17DU-117 with Lights

Terminal

Block

BK

O

BK BK BK
L1 120VAC
N

Pressure Switch

BK

BK
Indicator Lights
BK

BK

BK

W
W R W
G

W

Burner

Ignitor

Flame Rod

BK BR

Probe SIC1 Line1 TH Neutral Valve Neutral
Ground

Ignition Module

W
Blower

Gas Valve

34
t

Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Operation

! WARNING
This heater is not equipped with a pilot ignition system.
Do not attempt to light the system manually.
LIGHTING PROCEDURES:
1. Verify that service lid is secured.
2. Open (turn on) gas supply to the heater.
3. Close (turn on) electrical circuit (typically thermostat).
4. If the heater fails to light, turn off gas, open electrical circuit (set thermostat to lowest setting or to off). Wait five (5) minutes before repeating above steps.
SHUTDOWN PROCEDURES:
1. Open (turn off) electrical circuit.
2. Close (turn off) gas supply to the heater.
3. Wait five (5) minutes before relighting heater.

Sequence of Operation

Starting Circuit
Upon a call for heat, the fan is energized. Once operational static pressure is achieved, the differential switch will close initiating the ignition sequence. After a 5-second delay, the hot surface igniter is energized for 45 seconds and the control allows the gas valve to open.
The trial for ignition is 8 seconds. If flame sense is not established within 8.5 seconds, the heater will attempt two (2) additional ignition sequences before proceeding to soft lockout. Soft lockout automatically retries after one (1) hour or the control can be reset by briefly interrupting the power source.

Running Circuit
After ignition, the flame rod monitors the burner flame. If sense of flame is lost, the control immediately acts to reignite the gas-air mixture (identical to the starting sequence). If flame sense is not established within 8.5 seconds, the heater will attempt two (2) additional ignition sequences before proceeding to soft lockout. The control can be reset by briefly interrupting the power source.

35
t

Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Routine Inspection
! WARNING
Personal injury or death may result if maintenance is not performed by properly trained gas installer or service personnel. Contact the installing distributor or place of purchase for service. Do not operate heating system if repairs are necessary.
! WARNING
Allow heater to cool prior to servicing.
! WARNING
Disconnect power to heater before servicing.
! WARNING
Use protective glasses when cleaning the heater.

At least once per year, the heating system should be inspected and serviced by trained gas installation and service personnel only. This inspection should be performed at the beginning of the heating season to insure that all heater components are in proper working order and that the heating system operates at peak performance. Particular attention should be paid to the following items.
· Blower Motor: Annual oiling of the blower motor with SAE 20 oil will extend bearing life significantly. Ensure that the squirrel cage in the blower is kept clean. If dirt becomes a problem, installation of outside air intake ducts for combustion is recommended.
· Vent pipe system: Check the outside termination and the connections at the heater. Inspect the vent exhausts for leakage, damage, fatigue, corrosion and obstructions. If dirt becomes a problem, installation of outside air intake ducts for combustion is recommended.
· Combustion air intake system (when applicable): Check for blockage and/or leakage. Check the outside termination and the connection at the heater.

• Heat exchangers: Check the integrity of the heat exchangers. Replace if there are signs of structural failure. Check for corrosion and/or buildup within the tube exchanger passageways.
  · Burner: Check for proper ignition, burner flame and flame sense. Flame should extend directly outward from burner without floating or lifting.
  · Wiring: Check electrical connections for tightness and/or corrosion. Check wires for damage.
  · Gas Connection: Inspect the integrity of the gas connection to the heater. Check for leaks, damage, fatigue or corrosion. Do not operate if repairs are necessary and turn off gas supply to the heater. Contact service personnel.
  · Reflectors: To maintain effective infra-red heating, always keep both sides of the reflector clean. Maintenance can vary significantly depending on the environment. Dirt and dust can be vacuumed or wiped with a soap and water solution. Use metal polish if the reflectors are severely dirty.
  Contact service personnel if repairs are necessary. Do not operate unit.

36
t

Dayton Installation, Operation, Maintenance and Parts Manual
Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Troubleshooting

Symptom

Possible Cause

Thermostat closed, fan doesn’t operate.

• Blown fuse. · Faulty thermostat. · Loose or disconnected wire. · Faulty fan.

Thermostat closed. Fan operates. Switch · Loose or disconnected wire.

does not close.

• Box lid or gasket not in place.
• Plugged pressure switch lines.

Note: If hot surface igniter is

• Plugged or restricted exhaust vent.

energized, the indicator light is faulty. · Baffle location incorrect.

• Faulty pressure switches.

Thermostat closed. Fan operates. Pressure · Faulty hot surface igniter.

switch closes. No hot surface igniter.

• Faulty circuit board.

Thermostat closed. Fan operates. Pressure switch closes. Hot surface igniter energizes. Valve does not open.

• Disconnect gas valve wires. · Faulty circuit board. · Faulty gas valve.

Thermostat closed. Fan and hot surface igniter operate. Ignition occurs, burner cycles off in less than 60 seconds.

• Low gas pressure. · Baffle improperly positioned. · Faulty exhaust pressure switch. · Restricted flue vent. · No electrical ground. · Reversed polarity.

Thermostat closed. Fan and hot surface igniter operate. After 45 seconds hot surface igniter shuts off. No ignition.

• Closed gas supply. · Dirty or restricted orifice. · Faulty valve. Disconnected wire. · Inlet pressure exceeds 14 Inches W.C.

Loss of heater efficiency.

• Low gas pressure. · Dirty or restricted orifice. · Foreign matter inside burner. · Unit cycles on and off. · Reflector is dirty or not in place. · Clogged fan blower.

Radiant tube leaking burnt gases.

• Loose tube connections.

Condensation.
Tube bowing.
Tube corroding. Visual inspection of burner operation not possible. Stack sooting.
Odor or fumes in space (normal during first firing and will subside after initial burn off, approximately 20 minutes).

• Holes or cracks in radiant tubes.
  · Stack length is too long. · Light gauge flue stack used. · Contaminated combustion air.
  · Insufficient combustion air. · Over fired. · Contaminated combustion air. · Heater unable to expand properly. · Contaminated combustion air. · Dirty or sooted sight glass. · Unit mounted upside-down.
  · Insufficient combustion air. · Improper gas. · Dirty fan or blockage.
  · Vaporized solvents decomposing when contacting radiant tubes.
  · Evaporation of oils, solvents at floor level. · Fork lifts. · Loose tube / vent connections.

Corrective Action
· Replace. · Replace. · Repair as required. · Lubricate, repair or replace. · Repair as required. · Put in place. · Clean as necessary. · Remove foreign matter. · Re-position baffles at vent end. · Replace only. Do not adjust.
· Replace. · Replace. · Repair as required. · Replace. · Replace. · Provide required gas pressure. · Re-position baffle at vent end. · Replace. · Remove foreign matter. · Connect electrical ground to junction box. · Repair. · Open all gas connections. · Remove. Clean with a soft object. · Replace or repair. · Lower inlet pressure. · Provide required gas pressure. · Remove. Clean with a soft object. · Clean as necessary. · Check previous symptom. · Clean with aluminum cleaner and soft cloth. · Clean. · Ensure that tubes are fully connected
and clamped properly. · Replace.
· Shorten stack length. · Minimum of 26 ga. vent pipe required. · Provide fresh air inlet duct.
· Provide 1 sq. in. of free air for every 5,000 BTU/H of input. · Check gas pressure and orifice size. · Provide fresh air inlet duct. · Remount with flexible inlet or vent pipe. · Provide fresh air inlet duct. · Remove, clean or replace. · Mount correctly. · Provide 1 sq. in. of free air for every
5,000 BTU/H of input. · Correct with proper gas input (or clean). · Provide proper ventilation.
· Provide proper ventilation. · Tighten tube clamps to 50-100 ft-lb. · Seal vent pipes.

37
t

Dayton Installation, Operation, Maintenance and Parts Manual
For Repair Parts, call 1-800-323-0620
24 hours a day – 365 days a year
Please provide following information: -Model number -Serial number (if any) -Part description and number as shown in parts list

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88
26 13

38
t

30

15

24

47

64

59

34

54, 55

1

12

41

58

8

38

11 9

14 21
15, 16 14

20 65
66

63 62

22 17

10 46
68

61

48

2

45 67

40

19

49 50 44
5

3

23

17

4

35

7

51

6

43

18

39

28 27
25

52, 53 42

36, 37 60

Repair Parts Illustration for Dayton Tube Heater

Dayton Installation, Operation, Maintenance and Parts Manual
Repair Parts List for Dayton Tube Heater

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

39
t

Ref. Description No.

Part No. Quantity

1

Control Box Cover

TP-1

1

2

Flange Gasket

TP-5

1

3

Conduit Coupling

TP-9

1

4

Conduit 4″ x 1/2″

TP-10

1

5

Hot Surface Igniter Box

TP-11

1

6

Hot Surface Igniter Box Cover

TP-12

1

7

8 x 1/2″ Self-drilling Screw

TP-13

4

8

Sight Glass Gasket

TP-14

1

9

Sight Glass

TP-15

1

10

Sight Glass Washer

TP-16

1

11

Sight Glass Kit

TP-17

1

12

4″ Wire Hanger with Tension Spring

TP-19B

3-7

13

120″ Aluminum Reflector

TP-20C

2-6

14

4″ Standard Tube Clamp

TP-21B

2-6

15

120″ ALUM Combustion/Radiant Tube TP-26A

1-5

16

120″ AL-TI Combustion Tube

TP-26B

1

17

Control Box Mounting Bracket

TP-31B

2

18

1/2″ Shut-off Ball Valve/ Inlet Tap

TP-33B

1

19

Silcone Carbide Hot Surface Igniter

TP-50

1

20

Fan Blower

TP-55A

1

21

36″ Interlocking Heat Baffle

TP-65I

2-5

22

2″ x 4″ Outlet Box

TP-66

1

23

2″ x 4″ Outlet Box Cover

TP-67

1

24

Control Box Gasket (per foot)

TP-70

6

25

Rubber Grommet

TP-76

1

26

Reflector Center Support

TP-82

2-6

27

Stainless Steel Flexible Gas Connector TP-83

1

28

1/2″ Female/Male Flare Fitting

TP-84

1

29

1/4″ x 1/4″ Brass Atmos. Barb Fitting TP-97

1

30

Aluminum Reflector End Cap

TP-105

2

31

Reflector End Cap Clip (pkg. of 8)

TP-106

1

32

60″ ALUM Radiant Tube w/ Tube Clamp TP-111

1

33

60″ Aluminum Reflector

TP-112

1

34

Reflector Tension Spring

TP-113

1

Ref. Description

No.

35

Plastic Air Orifice w/ Screen – Consult Factory

36

Burner (50-100 MBH models)

37

Burner (125-200 MBH models)

38

16″ Burner Tube w/ Flange (fittings included)

39

Gas Orifice – Consult Factory

40

Hot Surface Igniter Holder

41

Pressure Switch Mounting Bracket

42

Gas Valve Mounting Bracket

43

1/2″ x 3″ Pipe Nipple

44

Hot Surface igniter Wiring Harness

45

Pressure Switch Barb

46

Vinyl Pressure Sensing Tube (exhaust)

47

Vinyl Pressure Sensing Tube (burner)

48

Hot Surface Igniter Holder Gasket

49

Flame Rod

50

Flame Rod Wire

51

Gas Manifold

52

Gas Valve Assembly – Natural Gas

53

Gas Valve Assembly – Propane Gas

54

Differential Pressure Switch (50-100 MBH)

55

Differential Pressure Switch (125-150 MBH)

56

Differential Pressure Switch (175 MBH)

57

Differential Pressure Switch (200 MBH)

58

Divider Panel w/ Pressure Switch Mtg. Tabs

59

Left End Panel with Light Holes

60

Right End Panel

61

Ignition Plate Gasket

62

120V Amber Operational Indicator Light

63

1/4″ Neutral Terminal Block

64

Green Self-tap Screw

65

Potted Circuit Board

66

Circuit Board Wiring Harness

67

Hot Surface Igniter Plate

68

Burner Control Box Outer Shell

• Conversions from natural gas to LP gas require the use of one TP-241 and one TP-204-Size and TP-114-Size. · Conversions from LP gas to Natural gas require the use of one TP-240 and one TP-204-Size and TP-114-Size. · Conversions between different BTU’s sizes are not allowed.

Part No.
TP-114 TP-200A TP-201B TP-380 TP-204 TP-205 TP-207 TP-208B TP-212 TP-214 TP-217 TP-218 TP-219 TP-221 TP-222 TP-222A TP-223 TP-240 TP-241 TP-264B TP- 264E TP-264D TP-264F TP-301 TP-302 TP-303 TP-321 TP-328 TP-329 TP-331 TP-351A TP-352A TP-383 TP-804

Quantity
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1

Dayton Installation, Operation, Maintenance and Parts Manual

7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88

Dayton® Tube Heaters

Limited Warranty

Dayton One-Year Limited Warranty. Dayton Radiant Tube Heaters, Models 7D837A thru 7D849A, 7D851A, 7AR79 thru 7AR88 covered in this manual, are warranted by Dayton Electric Mfg. Co. (Dayton) to the original user against defects in workmanship or materials under normal use for one year after date of purchase. Any part which is determined to be defective in material or workmanship and returned to an authorized service location, as Dayton designates, shipping costs prepaid, will be, as the exclusive remedy, repaired or replaced at Dayton’s option. For limited warranty claim procedures, see PROMPT DISPOSITION below. This limited warranty gives purchasers specific legal rights which vary from jurisdiction to jurisdiction.
Additional Limited Warranty. In addition to the above mentioned one-year warranty, Dayton warrants the original purchaser an additional 4-year extension on the combustion chamber, radiant tubes and stainless steel burner. This 4-year extension excludes electrical/purchased components.
General Conditions. Dayton will not be responsible for labor charges for the analysis of a defective condition of the heater or for the installation of replacement parts. The warranties provided herein will not apply if the input of the heater exceeds the rated input at time of manufacturing or if the heater in the judgement of the Company has been subjected to misuse, excessive dust, improper conversion, negligence, accident, corrosive atmospheres, excessive thermal shock, excessive vibration, physical damage to the heater, alterations by unauthorized service personnel, operation contrary to Dayton’s instructions or if the serial number has been altered, defaced or removed. Dayton shall not be liable for any default or delay in the performance of these warranties caused by contingency beyond its control, including war, government restriction or restraints, strikes, fire, flood, short or reduced supply of raw materials, or parts. The warranties herein shall be null and void if the heater is not installed by a competent heating contractor and/ or if the heater is not installed according to Dayton’s instructions, normal industry practices and/or if the heater is not maintained and repaired according to Dayton’s instructions. Normal product degradation and wear (rust, oxidation, etc.) does not constitute a material defect and applicable warranty claim.
Limitation of Liability. To the extent allowable under applicable law, Dayton’s liability for consequential and incidental damages is expressly disclaimed. Dayton’s liability in all events is limited to and shall not exceed the purchase price paid.
Warranty Disclaimer. Dayton has made a diligent effort to provide product information and illustrate the products in this literature accurately; however, such information and illustrations are for the sole purpose of identification, and do not express or imply a warranty that the products are merchantable, or fit for a particular purpose, or that the products will necessarily conform to the illustrations or descriptions. Except as provided below, no warranty or affirmation of fact, expressed or implied, other than as stated in the “LIMITED WARRANTY” above is made or authorized by Dayton.
Product Suitability. Many jurisdictions have codes and regulations governing sales, construction, installation, and/or use of products for certain purposes, which may vary from those in neighboring areas. While Dayton attempts to assure that its products comply with as many codes, it cannot guarantee compliance, and cannot be responsible for how the product is installed or used. Before purchase and use of a product, review the product applications, and all applicable national and local codes and regulations, and be sure that the product, installation, and use will comply with them.
Certain aspects of disclaimers are not applicable to consumer products: e.g., (a) some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you: (b) also, some jurisdictions do not allow a limitation on how long an implied warranty lasts, consequently the above limitation may not apply to you: and (c) by law, during the period of this limited warranty, any implied warranties of implied merchantability or fitness for a particular purpose applicable to consumer products purchased by consumers, may not be excluded or otherwise disclaimed.
Prompt Disposition. Dayton will make a good faith effort for prompt correction or other adjustment with respect to any product which proves to be defective within limited warranty. For any product believed to be defective within limited warranty, first write or call dealer from whom the product was purchased. Dealer will give additional directions. If unable to resolve satisfactorily, write to Dayton at address below, giving dealer’s name, address, date and number of dealer’s invoice, and describe the nature of the defect. Title and risk of loss pass to buyer on delivery to common carrier. If product was damaged in transit to you, file claim with carrier.
Manufactured for Dayton Electric Mfg. Co., 5959 W. Howard St., Niles, Illinois 60714 U.S.A.
Manufactured for Dayton Electric Mfg. Co. Niles, Illinois 60714 U.S.A.

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