LENNOX LHT/LDT180 Heat Pump And Dual-Fuel Packaged Units Instructions

LENNOX LHT/LDT180 Heat Pump And Dual-Fuel Packaged Units I

CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal in­jury. Take care while handling this equipment and wear gloves and protective clothing.

Attention!
Use this QR code to download the mobile service app. Follow the prompts to pair the app with the unit control system and configure the unit. Refer to the “Download Mobile App” section in this manual and the Setup Guide provided with this unit. The QR code is also available in the unit control area.The app can be downloaded from the appropriate iOS or Android store. Look for the following icon.

WARNING
To prevent serious injury or death:

1. Lock-out/tag-out before performing maintenance.
2.  If system power is required (e.g., smoke detector mainte­nance), disable power to blower, remove fan belt where applicable, and ensure all controllers and thermostats are set to the “OFF” position before performing maintenance.
3.  Always keep hands, hair, clothing, jewelry, tools, etc., away from moving parts.

LHT/LDT DIMENSIONS

LHT180, 240 PARTS ARRANGEMENT

LDT180, 240 PARTS ARRANGEMENT

Shipping and Packing List

Package 1 of 1 contains:

1.  Assembled unit

Check unit for shipping damage. Receiving party should contact last carrier immediately if shipping damage is found.

General

These instructions are intended as a general guide and do not supersede local codes in any way. Authorities having jurisdiction should be consulted before installation. LHT packaged heat pump and LDT packaged dual-fuel units have identical refrigerant circuits with respective 15-and 20-ton cooling capacities. Units contain two compressors; compressor 1 is two-speed and compressor 2 is fixed speed. Units are equipped with factory-installed fin/tube outdoor coils. Optional electric heat is factory- or field-installed in LHT units. The LDT unit is available in 169,000, 260,000, 360,000, and 480,000 Btuh heating inputs. Units are available with multi-staged air volume. Units use R410A, an ozone-friendly HFC refrigerant. Refer to the Cooling Start-Up section for precautions when installing unit.

WARNING
Electric shock hazard and danger of explosion. Can cause injury, death or product or property damage. Turn off gas and electrical power to unit before performing any maintenance or servicing operations on the unit. Follow lighting instructions attached to unit when putting unit back into operation and after service or maintenance.

Requirements
See figure 1 for unit clearances.

Clearance to
Combus­tibles| 36
(914)| 1 (25)| 1 (25)| **** 1 (25)| Unob­ structed
Minimum Operation Clearance| 36
(914)| 36
(914)| 36
(914)| 41
(1041)| Unob­ structed

Note: Entire perimeter of unit base requires support when elevated above mounting surface.

Service Clearance – Required for removal of serviceable parts.

Clearance to Combustibles – Required clearance to combustible material (dual-fuel units). On LHT units, see clearance to combustible materials outlined on heater rating plate.

Minimum Operation Clearance – Required clearance for proper unit operation.

NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to swell. Bubbles in the rubber roofing material can cause leaks. Protect the roof surface to avoid exposure to refrigerant and oil during service and installation. Failure to follow this notice could result in damage to roof surface. Use of this unit as a construction heater or air conditioner is not recommended during any phase of construction. Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit. If this unit has been used for heating or cooling of buildings or structures under construction, the following conditions must be met or the warranty will be void:

•  The vent hood must be installed per these installation instructions.
•  A room thermostat must control the unit. The use of  fixed jumpers that will provide continuous heating or cooling is not allowed.
• A pre-filter must be installed at the entry to the return air duct.
•  The return air duct must be provided and sealed to the unit.
• Return air temperature range between 55°F (13°C) and 80°F (27°C) must be maintained.
•  Air filters must be replaced and pre-filters must be removed upon construction completion.
•  The input rate and temperature rise must be set per the unit rating plate.
• The heat exchanger, components, duct system, air filters and indoor coil must be thoroughly cleaned following final construction clean-up.
•  The unit operating conditions (including airflow, cooling operation, ignition, input rate, temperature rise and venting) must be verified according to these installation instructions.

This appliance is not to be used by persons with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction. This appliance should not be used by children. Children should be supervised to ensure they do not play with the appliance.

IMPORTANT
The Clean Air Act of 1990 bans the intentional vent­ing of refrigerant (CFC’s and HCFC’s) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incar­ceration may be levied for non-compliance.

Unit Support
In downflow discharge installations, install the unit on a non-combustible surface only. Unit may be installed on combustible surfaces when used in horizontal discharge applications or in downflow discharge applications when installed on an LARMF18/36 roof mounting frame.
NOTE – Securely fasten roof frame to roof per local codes.

CAUTION
To reduce the likelihood of supply / return air by­pass and promote a proper seal with the RTU, duct work / duct drops / diffuser assemblies must be supported independently to the building structure.

A-Downflow Discharge Application
Roof Mounting with LARMF18/36

• The LARMF roof mounting frame must be installed, flashed and sealed in accordance with the instructions provided with the frame.
• The LARMF roof mounting frame should be square and level to 1/16” per linear foot (5mm per linear meter) in any direction.
• Duct must be attached to the roof mounting frame and not to the unit; supply and return plenums must be installed before setting the unit.

Installer’s Roof Mounting Frame
Many types of roof frames can be used to install the unit depending upon different roof structures. Items to keep in mind when using the building frame or supports are:

1.  The base is fully enclosed and insulated, so an enclosed frame is not required.
2.  The frames or supports must be constructed with non-combustible materials and should be square and level to 1/16” per linear foot (5mm per linear meter) in any direction.
3. Frame or supports must be high enough to prevent any form of moisture from entering unit. Recommended minimum frame height is 14” (356mm).
4. Duct must be attached to the roof mounting frame and not to the unit. Supply and return plenums must be installed before setting the unit.
5. Units require support along all four sides of unit base. Supports must be constructed of steel or suitably treated wood materials.

NOTE: When installing a unit on a combustible surface for downflow discharge applications, an LARMF18/36 roof mounting frame is required.

B-Horizontal Discharge Applications

1.  Units installed in horizontal airflow applications must use an LARMFH18/24 horizontal roof mounting frame. The supply air duct connects to the horizontal supply air opening on the LARMFH18/24. The return air duct connects to the unit horizontal return air opening. Refer to unit dimensions.
2.  Specified installation clearances must be maintained when installing units. Refer to figure 1.
3.  Top of support slab should be approximately 4” (102mm) above the finished grade and located so no run-off water from higher ground can collect around the unit.
4.  Units require support along all four sides of unit base. Supports must be constructed of steel or suitably treated wood materials.

Duct Connection
All exterior ducts, joints and openings in roof or building walls must be insulated and weather-proofed with flashing and sealing compounds in accordance with applicable codes. Any duct passing through an unconditioned space must be insulated.

CAUTION
In downflow applications, do not drill or punch holes in base of unit. Leaking in roof may occur if unit base is punctured.

Rigging Unit For Lifting
Rig unit for lifting by attaching four cables to holes in unit base rail.

1. Detach wooden base protection before rigging.
2. Connect rigging to the unit base using both holes in each corner.
3. All panels must be in place for rigging.
4.  Place field‐provided H‐style pick in place just above top edge of unit. Frame must be of adequate strength and length. (H-style pick prevents damage to unit.)

RIGGING

• Maximum weight with all available factory-installed accessories.

Condensate Drains
Remove cap and make drain connection to the 1” N.P.T. drain coupling provided on unit. A trap must be installed between drain connection and an open vent for proper condensate removal. It is sometimes acceptable to drain condensate onto the roof or grade; however, a tee should be fitted to the trap to direct condensate downward. The condensate line must be vented. Check local codes concerning condensate disposal. Refer to pages 2, 3 and 4 for condensate drain location.
Note: The drain pan is made with a glass reinforced engineered plastic capable of withstanding typical joint torque but can be damaged with excessive force. Tighten pipe nipple hand tight and turn an additional quarter turn.

Connect Gas Piping
Before connecting piping, check with gas company or authorities having jurisdiction for local code requirements. When installing gas supply piping, length of run from gas meter must be considered in determining pipe size for 0.5” w.c. (.12kPa) maximum pressure drop. Do not use supply pipe smaller than unit gas connection. For natural gas units, operating pressure at the unit gas connection must be a minimum of 4.7” w.c. (1.17kPa) and a maximum of 10.5” (2.60kPa) w.c. For LP/propane gas units, operating pressure at the unit gas connection must be a minimum of 11” w.c. (2.74kPa) and a maximum of 13.5” w.c. (3.36kPa). When making piping connections a drip leg should be installed on vertical pipe runs to serve as a trap for sediment or condensate. A 1/8” N.P.T. plugged tap is located on gas valve for test gauge connection. Refer to Heating Start-Up section for tap location. Install a ground joint union between the gas control manifold and the main manual shut-off valve. for gas supply piping entering outside the unit. for gas supply entering through bottom of unit. Compounds used on threaded joints of gas piping shall be resistant to the action of liquified petroleum gases.

Pressure Test Gas Piping
When pressure testing gas lines, the gas valve must be disconnected and isolated. Gas valves can be damaged if subjected to more than 0.5 psig (3.48kPa). NOTE: Codes may require that manual main shut-off valve and union (furnished by installer) be installed in gas line external to unit. Union must be of the ground joint type.
After all connections have been made, check all piping connections for gas leaks. Also check existing unit gas connections up to the gas valve; loosening may occur during installation. Use a leak detection solution or other preferred means. Do not use matches candles or other sources of ignition to check for gas leaks.
NOTE: In case emergency shut down is required, turn off the main manual shut-off valve and disconnect main power to unit. These devices should be properly labeled by the installer.

CAUTION
Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed. Do not use matches, candles, flame or othe sources of ignition to check for gas leaks.

WARNING
Danger of explosion. Can cause injury or product or property damage. Do not use matches, candles, flame or other sources of ignition to check for leaks.

High Altitude Derate
Locate the high altitude conversion sticker in the unit literature bag. Fill out the conversion sticker and affix next to the unit nameplate. High altitude kits are available for field-installation.
Refer to table 1 for high altitude adjustments.

HIGH ALTITUDE DERATE

• Units installed at 0-2000 feet do not need to be modified.

NOTE: This is the only permissible derate for these units.

Download Mobile Service App
A-Mobile Device Requirements

•  Android hardware requires 2GB RAM and a 2Ghz core processor. Tablets are supported.
•  Minimum Android 6.0 (Marshmallow) or higher. Recommend Android 10 and Apple products require iOS version 11 or higher.

B-New Installations
Once the app is downloaded, refer to the Setup Guide provided with this unit to pair the app to the unit control system. Follow the setup wizard prompts to configure the unitfor the app menu overview. If a mobile device is unavailable or not pairing, refer to the Unit Controller Setup Guide for start-up instructions.

Electrical Connections – Power Supply

A-Wiring
Route field wiring in conduit between bottom power entry and disconnect. See figure 8. This does not supersede local codes or authorities having jurisdiction. Do not apply power or close disconnect switch until installation is complete. Refer to start-up directions. Refer closely to unit wiring diagram. Refer to unit nameplate for minimum circuit ampacity and maximum fuse size.

1. Units are factory-wired for 240/460/575 volt supply. For 208V supply, remove the insulated terminal cover from the 208V terminal on the control transformer. Move the wire from the transformer 240V terminal to the 208V terminal. Place the insulated terminal cover on the unused 240V terminal.
2. Route power through the bottom power entry area and connect to line side of unit disconnect, circuit breaker or terminal block. See unit wiring diagram.
3. Units With Optional 120v GFCI Outlet -Route and connect separate 120v wiring to GFCI outlets which do not have factory-installed wiring. Route field wiring in conduit between bottom power entry and GFCI.

B-Unbalanced Three-Phase Voltage
Units equipped with an inverter (VFD) are designed to operate on balanced, three-phase power. Operating units on unbalanced three-phase power will reduce the reliability of all electrical components in the unit. Unbalanced power is a result of the power delivery system supplied by the local utility company. Factory-installed inverters are sized to drive blower motors with an equivalent current rating using balanced three-phase power. When unbalanced three-phase power is supplied; the installer must replace the existing factory-installed inverter with an inverter that has a higher current rating to allow for the imbalance. Use table 2 to determine the appropriate replacement inverter.

INVERTER UP-SIZING

Electrical Connections – Control Wiring

A-Thermostat Location
Room thermostat mounts vertically on a standard 2” X 4” handy box or on any non-conductive flat surface. Locate thermostat approximately 5 feet (1524mm) above the floor in an area with good air circulation at average temperature. Avoid locating the room thermostat where it might be affected by:

•  drafts or dead spots behind doors and in corners
•  hot or cold air from ducts
• radiant heat from sun or appliances
• concealed pipes and chimneys

B-Wire Routing
Route thermostat cable or wires from subbase through knockout provided in unit. Use 18 AWG wire for all applications using remotely installed electro- mechanical and electronic thermostats. On hot gas reheat units, route wires from RH sensor or remote switch through knockout provided in unit. For sensor installations, use 22AWG stranded, two twisted pairs, individually shielded, 100% aluminum shield with drain wire and Teflon jacket.
IMPORTANT : Unless field thermostat wires are rated for maximum unit voltage, they must be routed away from line voltage wiring.

C-Wire Connections
The Unit Controller will operate the unit from a thermostat or zone sensor based on the System Mode. The default System Mode is the thermostat mode. Refer to the Unit Controller Setup Guide to change the System Mode. Use the mobile service app menu and select:
SETTINGS > INSTALL.
Note: Unit Controller is capable of up to four stages of cooling in network control mode.

1.  Default Thermostat Mode –
   The Unit Controller will operate two stages of heating and cooling based on thermostat demands. Install thermostat assembly in accordance with instructions provided with thermostat. for field wiring and and refer to wiring diagrams on unit.
   IMPORTANT: Terminal connections at the wall plate or subbase must be made securely. Loose control wire connections may result in intermittent operation.

2.  Zone Sensor Mode –
   The Unit Controller will operate heating and cooling based on the Unit Controller internal setpoints and the temperature from the A2 zone sensor. An optional Network Control Panel (NCP) can also be used to provide setpoints. A thermostat or return air sensor can be used as a back-up mode. Make zone sensor wiring connections as shown .

Note: Install sensor and make communication wiring connections as shown in literature provided with sensor.

Blower Operation and Adjustments

Supply Air Staged Units – The blower rotation will always be correct on units equipped with an inverter. Checking blower rotation is not a valid method of determining voltage phasing for incoming power.
Supply Air Staged Units and Units Equipped With Optional Voltage or Phase Detection – The Unit Controller checks the incoming power during start-up. If the voltage or phase is incorrect, the Unit Controller will display an alarm and the unit will not start.

A-Blower Operation
Refer to the Unit Controller Setup Guide to energize blower. Use this mobile service app menu:
SERVICE > TEST > BLOWER
Instructions provided with the thermostat may also be used to initiate blower only (G) demand. Unit will cycle on thermostat demand. The following steps apply to applications using a typical electro-mechanical thermostat.

1. Blower operation is manually set at the thermostat subbase fan switch. With fan switch in ON position, blowers will operate continuously.
2. With fan switch in AUTO position, the blowers will cycle with demand. Blowers and entire unit will be off when system switch is in OFF position.

IMPORTANT
Three Phase Scroll Compressor Voltage Phasing Three phase scroll compressors must be phased se­quentially to ensure correct compressor and blower* rotation and operation. Compressor and blower are wired in phase at the factory. Power wires are color-coded as follows: line 1-red, line 2-yellow, line 3-blue.

1. Observe suction and discharge pressures and blow­er* rotation on unit start-up.

2. Suction pressure must drop, discharge pressure must rise and blower rotation must match rotation marking.
   If pressure differential is not observed or blower rota­tion is not correct:

3.  Disconnect all remote electrical power supplies.

4. Reverse any two field-installed wires connected to the line side of S48 disconnect or TB13 terminal strip. Do not reverse wires at blower contactor.

5. Make sure the connections are tight.

Discharge and suction pressures should operate at their normal start‐up ranges.

• Supply air inverter blower motors should rotate in the correct direction; verify scroll compressor rotation separately. Contact technical support if the blower is rotating incorrectly.

WARNING

1.  Make sure that unit is installed in accordance with the installation instructions and applicable codes.
2. Inspect all electrical wiring, both field‐ and factory‐installed, for loose connections. Tighten as required.
3. Check to ensure that refrigerant lines do not rub against the cabinet or against other refrigerant lines.
4. Check voltage at disconnect switch. Voltage must be within range listed on nameplate. If not, consult power company and have voltage condition corrected before starting unit.
5.  Make sure filters are new and in place before start‐up.

B-Blower Access

1.  Disconnect jack/plug connector to blower motor. Also disconnect jack/plug connector heating limit switches on gas units.
2.  Remove screws on either side of blower assembly sliding base.
3. Pull base toward outside of unit.

C-Determining Unit CFM
IMPORTANT: Multi-staged supply air units are factory-set to run the blower at full speed when there is a blower (G) demand without a heating or cooling demand. Refer to the field-provided, design specified CFM for all modes of operation. Use the following procedure to adjust motor pulley to deliver the highest CFM called for in the design spec. See Inverter Start-Up section to set blower CFM for all modes once the motor pulley is set.

1. The following measurements must be made with a dry indoor coil. Run blower (G demand) without a cooling demand. Measure the indoor blower shaft RPM. Air filters must be in place when measurements are taken.
2. With all access panels in place, measure static pressure external to unit (from supply to return). Blower performance data is based on static pressure readings taken in locations shown . Note: Static pressure readings can vary if not taken where shown.
3. Referring to the blower tables, use static pressure and RPM readings to determine unit CFM. Use the accessory air resistance table when installing units with any of the optional accessories listed.
4. The blower RPM can be adjusted at the motor pulley. Loosen Allen screw and turn adjustable pulley clockwise to increase CFM. Turn counterclockwise to decrease CFM. Do not exceed minimum and maximum number of pulley turns as shown in table 3.

MINIMUM AND MAXIMUM PULLEY ADJUSTMENT

• No minimum number of turns open when B belt is used on pulleys 6” O.D. or larger.

D-Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if proper pulley alignment and belt tension are maintained. Tension new belts after a 24-48 hour period of operation. This will allow belt to stretch and seat into pulley grooves. Make sure blower and motor pulley are aligned.

1. Loosen four screws securing blower motor to sliding base. See figure 12.
2.  To increase belt tension – Turn belt tension adjusting screw to the left, or counterclockwise, to tighten the belt. This increases the distance between the blower motor and the blower housing. To loosen belt tension – Turn the adjusting screw to the right, or clockwise to loosen belt tension.
3.  Tighten four screws securing blower motor to sliding base once adjustments have been made.

E-Check Belt Tension
Over tensioning belts shortens belt and bearing life. Check belt tension as follows:

1.  Measure span length X. .

2. Apply perpendicular force to center of span (X) with enough pressure to deflect belt 1/64” for every inch of span length or 1.5mm per 100mm of span length. Example: Deflection distance of a 40” span would be 40/64” or 5/8”.
   Example: Deflection distance of a 400mm span would be 6mm.

3. Measure belt deflection force. For a used belt, the deflection force should be 5 lbs. (35kPa) . A new belt deflection force should be 7 lbs. (48kPa).
   A force below these values indicates and under tensioned belt. A force above these values indicates an over tensioned belt.

F-Field-Furnished Blower Drives
For field-furnished blower drives, use page 15 or 16 to determine BHP and RPM required. Reference table 4 to determine the manufacturer’s model number.

BLOWER DATA
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL & AIR FILTERS IN PLACE FOR ALL UNITS ADD:

1. Wet indoor coil air resistance of selected unit. 2 – Any factory installed options air resistance (electric heat, economizer, etc.) 3 – Any field installed accessories air resistance (electric heat, duct resistance, diffuser, etc.)

Then determine from blower table blower motor output and drive required. See page 16 for wet coil and option/accessory air resistance data. See page 16 for factory installed drive kit specifications.

MINIMUM AIR VOLUME REQUIRED FOR DIFFERENT GAS HEAT SIZES
Low (L), Standard (S) and Medium Heat (M) – 4500 cfm minimum. High Heat (H) – 5125 cfm minimum.

MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT
LHT units require 6000cfm minimum air with electric heat.

– – –
    3750| 425| 0.50| 540| 0.75| 630| 1.05| 710| 1.30| 780| 1.60| 845| 1.85| 905| 2.15| 960| 2.45| 1010| 2.70| 1060| 3.00| 1110| 3.30| – – –| – – –| – – –| – – –
4000| 435| 0.55| 545| 0.85| 635| 1.10| 715| 1.40| 785| 1.70| 850| 2.00| 910| 2.30| 965| 2.60| 1020| 2.90| 1070| 3.25| 1115| 3.55| 1160| 3.85| 1205| 4.15
   4250| 445| 0.60| 555| 0.90| 645| 1.25| 725| 1.55| 795| 1.85| 855| 2.15| 915| 2.45| 970| 2.80| 1025| 3.10| 1075| 3.45| 1120| 3.75| 1165| 4.10| 1210| 4.45
4500| 455| 0.70| 565| 1.00| 655| 1.35| 730| 1.65| 800| 2.00| 865| 2.35| 925| 2.65| 980| 3.00| 1030| 3.30| 1080| 3.65| 1130| 4.05| 1175| 4.35| 1215| 4.70
   4750| 470| 0.75| 575| 1.10| 660| 1.45| 740| 1.80| 810| 2.15| 870| 2.50| 930| 2.85| 985| 3.20| 1040| 3.55| 1085| 3.90| 1135| 4.25| 1180| 4.65| 1225| 5.00
5000| 480| 0.85| 585| 1.25| 670| 1.60| 750| 1.95| 815| 2.30| 880| 2.70| 940| 3.05| 995| 3.40| 1045| 3.80| 1095| 4.15| 1140| 4.50| 1185| 4.90| 1230| 5.30
   5250| 495| 0.95| 595| 1.35| 680| 1.70| 755| 2.10| 825| 2.50| 890| 2.90| 945| 3.25| 1000| 3.65| 1050| 4.00| 1100| 4.40| 1150| 4.80| 1195| 5.20| 1235| 5.60
5500| 505| 1.05| 605| 1.45| 690| 1.85| 765| 2.25| 835| 2.65| 895| 3.05| 955| 3.45| 1010| 3.85| 1060| 4.25| 1110| 4.70| 1155| 5.10| 1200| 5.50| 1240| 5.90
    5750| 520| 1.15| 615| 1.60| 700| 2.00| 775| 2.45| 840| 2.85| 905| 3.25| 960| 3.65| 1015| 4.10| 1065| 4.50| 1115| 4.95| 1160| 5.35| 1205| 5.80| 1250| 6.25
6000| 530| 1.30| 630| 1.75| 710| 2.15| 785| 2.60| 850| 3.05| 910| 3.45| 970| 3.90| 1025| 4.35| 1075| 4.80| 1120| 5.20| 1170| 5.65| 1215| 6.10| 1255| 6.55
    6250| 545| 1.40| 640| 1.90| 720| 2.35| 795| 2.80| 860| 3.25| 920| 3.70| 975| 4.15| 1030| 4.60| 1080| 5.05| 1130| 5.50| 1175| 5.95| 1220| 6.45| 1265| 6.90
6500| 560| 1.55| 650| 2.05| 730| 2.50| 805| 3.00| 870| 3.45| 930| 3.95| 985| 4.40| 1040| 4.85| 1090| 5.35| 1140| 5.85| 1185| 6.30| 1225| 6.75| 1270| 7.25
    6750| 570| 1.70| 665| 2.20| 745| 2.70| 815| 3.20| 880| 3.70| 940| 4.20| 995| 4.65| 1045| 5.10| 1095| 5.60| 1145| 6.10| 1190| 6.60| 1235| 7.10| 1275| 7.60
7000| 585| 1.85| 675| 2.35| 755| 2.90| 825| 3.40| 890| 3.95| 950| 4.45| 1005| 4.95| 1055| 5.40| 1105| 5.95| 1155| 6.45| 1200| 6.95| 1240| 7.45| 1285| 8.00
    7250| 600| 2.00| 690| 2.60| 765| 3.10| 835| 3.65| 900| 4.15| 955| 4.65| 1015| 5.25| 1065| 5.75| 1115| 6.25| 1160| 6.75| 1205| 7.30| 1250| 7.85| 1290| 8.35
7500| 615| 2.20| 700| 2.75| 775| 3.30| 845| 3.85| 910| 4.45| 965| 4.95| 1020| 5.50| 1075| 6.05| 1125| 6.60| 1170| 7.15| 1215| 7.65| 1260| 8.25| 1300| 8.75
    7750| 630| 2.40| 715| 3.00| 790| 3.55| 855| 4.10| 920| 4.70| 975| 5.25| 1030| 5.80| 1080| 6.35| 1130| 6.90| 1180| 7.50| 1225| 8.05| 1265| 8.60| 1305| 9.15
8000| 640| 2.55| 725| 3.20| 800| 3.80| 865| 4.35| 930| 4.95| 985| 5.50| 1040| 6.10| 1090| 6.70| 1140| 7.25| 1185| 7.85| 1230| 8.40| 1275| 9.00| 1315| 9.60
    8250| 655| 2.80| 740| 3.40| 810| 4.00| 880| 4.65| 940| 5.25| 995| 5.85| 1050| 6.45| 1100| 7.05| 1150| 7.65| 1195| 8.25| 1240| 8.85| 1280| 9.40| 1325| 10.05
8500| 670| 3.00| 750| 3.65| 825| 4.30| 890| 4.90| 950| 5.55| 1005| 6.15| 1060| 6.80| 1110| 7.40| 1160| 8.05| 1205| 8.65| 1250| 9.25| 1290| 9.85| 1330| 10.45
    8750| 685| 3.25| 765| 3.90| 835| 4.55| 900| 5.20| 960| 5.85| 1015| 6.45| 1070| 7.15| 1120| 7.75| 1165| 8.35| 1215| 9.05| 1255| 9.65| 1300| 10.30| 1340| 10.90
9000| 700| 3.50| 780| 4.20| 850| 4.85| 910| 5.50| 970| 6.15| 1025| 6.80| 1080| 7.50| 1130| 8.15| 1175| 8.75| 1220| 9.40| 1265| 10.10| 1310| 10.80| 1350| 11.40
    9250| 715| 3.75| 790| 4.45| 860| 5.15| 925| 5.85| 985| 6.55| 1040| 7.20| 1090| 7.85| 1140| 8.55| 1185| 9.20| 1230| 9.85| 1275| 10.55| 1315| 11.20| – – –| – – –
9500| 730| 4.00| 805| 4.75| 875| 5.45| 935| 6.15| 995| 6.90| 1050| 7.60| 1100| 8.25| 1150| 8.95| 1195| 9.60| 1240| 10.30| 1285| 11.05| – – –| – – –| – – –| – – –
    9750| 745| 4.30| 820| 5.05| 885| 5.75| 950| 6.55| 1005| 7.20| 1060| 7.95| 1110| 8.65| 1160| 9.40| 1205| 10.05| 1250| 10.80| 1295| 11.50| – – –| – – –| – – –| – – –
10,000| 760| 4.60| 835| 5.40| 900| 6.15| 960| 6.85| 1015| 7.60| 1070| 8.35| 1120| 9.05| 1170| 9.80| 1215| 10.50| 1260| 11.25| – – –| – – –| – – –| – – –| – – –| – – –
  10,250| 775| 4.90| 845| 5.65| 910| 6.45| 970| 7.20| 1030| 8.00| 1080| 8.75| 1135| 9.55| 1180| 10.25| 1225| 11.00| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
10,500| 790| 5.20| 860| 6.00| 925| 6.85| 985| 7.65| 1040| 8.40| 1095| 9.20| 1145| 10.00| 1190| 10.70| 1235| 11.45| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
  10,750| 805| 5.55| 875| 6.40| 940| 7.25| 1000| 8.05| 1055| 8.85| 1105| 9.65| 1155| 10.45| 1200| 11.20| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
11,000| 820| 5.90| 890| 6.80| 950| 7.60| 1010| 8.45| 1065| 9.30| 1115| 10.05| 1165| 10.90| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –

FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS

Motor Efficiency| Nominal hp| Maximum hp| Drive Kit Number| RPM Range
---|---|---|---|---
Standard| 3| 3.45| 1| 535 – 725
Standard| 3| 3.45| 2| 710 – 965
Standard| 5| 5.75| 3| 685 – 856
Standard| 5| 5.75| 4| 850 – 1045
Standard| 5| 5.75| 5| 945 – 1185
Standard| 7.5| 8.63| 6| 850 – 1045
Standard| 7.5| 8.63| 7| 945 – 1185
Standard| 7.5| 8.63| 8| 1045 – 1285
Standard| 10| 11.50| 7| 945 – 1185
Standard| 10| 11.50| 10| 1045 – 1285
Standard| 10| 11.50| 11| 1135 – 1365

NOTE: Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required. Maximum usable output of motors furnished are shown. In Canada, nominal motor output is also maximum usable motor output. If motors of comparable output are used, be sure to keep within the service factor limitations outlined on the motor nameplate.
NOTE : Units equipped with an inverter are limited to a motor service factor of 1.0.

FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE

Air Volume CFM| WetInddor
Coil| Gas Heat Exchanger| Electric Heat| Economizer| Filters| Horizontal Roof Curb
---|---|---|---|---|---|---
Low/ Standard Heat| Medium Heat| High Heat
in. w.g.| in. w.g.| in. w.g.| in. w.g.| in. w.g.| in. w.g.| MERV 8| MERV 13| in. w.g.
2750| .02| .02| .04| .05| – – –| – – –| .01| .03| .03
3000| .02| .03| .04| .05| – – –| – – –| .01| .03| .04
3250| .03| .03| .05| .06| – – –| – – –| .01| .04| .04
3500| .03| .03| .05| .06| – – –| – – –| .01| .04| .05
3750| .03| .04| .06| .07| – – –| – – –| .01| .04| .05
4000| .04| .04| .06| .07| – – –| – – –| .04| .06| .06
4250| .04| .04| .06| .08| – – –| – – –| .04| .06| .07
4500| .05| .05| .07| .09| – – –| – – –| .04| .07| .07
4750| .05| .05| .08| .10| – – –| – – –| .04| .07| .08
5000| .05| .05| .09| .11| – – –| – – –| .05| .07| .08
5250| .06| .06| .10| .12| – – –| – – –| .05| .07| .09
5500| .07| .06| .10| .13| – – –| – – –| .05| .07| .10
5750| .07| .06| .11| .14| – – –| – – –| .05| .08| .11
6000| .08| .07| .12| .15| .01| – – –| .05| .08| .11
6250| .08| .07| .12| .16| .01| .01| .05| .08| .12
6500| .09| .08| .13| .17| .01| .02| .05| .08| .13
6750| .10| .08| .14| .18| .01| .03| .05| .08| .14
7000| .10| .09| .15| .19| .01| .04| .06| .08| .15
7250| .11| .09| .16| .20| .01| .05| .06| .09| .16
7500| .12| .10| .17| .21| .01| .06| .06| .09| .17
8000| .13| .11| .19| .24| .02| .09| .06| .09| .19
8500| .15| .12| .20| .26| .02| .11| .06| .09| .21
9000| .16| .13| .23| .29| .04| .14| .07| .10| .24
9500| .18| .14| .25| .32| .05| .16| .07| .10| .26
10,000| .20| .16| .27| .35| .06| .19| .07| .11| .29
10,500| .22| .17| .30| .38| .09| .22| .07| .11| .31
11,000| .24| .18| .31| .40| .11| .25| .08| .11| .34

MANUFACTURER’S NUMBERS

Part No.

| Supplier No.| OEM
Part No.| Supplier No.| OEM
Part No.
1| 2, 3| 535| 725| 1VP40x7/8| 79J0301| BK95 x 1-3/16| 105617-02| BX59| 59A5001| BX60| 100245-10| N/A| N/A
2| 2, 3| 710| 965| 1VP40x7/8| 79J0301| BK72 x 1‐3/16| 105617-01| BX55| 63K0501| BX57| 78L5301| N/A| N/A
3| 5| 685| 865| 1VP50x1-1/8| P-8-1977| BK100 x 1‐3/16| 105617-03| BX61| 93J9801| 5VX660| 100245-20| N/A| N/A
4| 5| 850| 1045| 1VP65x1-1/8| 100239-03| BK110H| 100788-06| BX65| 100245-08| BX66| 97J5901| H-1-3/16| 105616-02
5| 5| 945| 1185| 1VP60x1-1/8| 41C1301| BK90H x 1-7/16| 100788-04| BX61| 93J9801| BX62| 57A7701| H-1-3/16| 105616-02
6| 7.5| 850| 1045| 1VP65x1-3/8| 78M7101| BK110H| 100788-06| BX66| 97J5901| BX67| 100245-09| H-1-3/16| 105616-02
7| 7.5 & 10| 945| 1185| 1VP60x1-3/8| 78L5501| BK90H x 1-7/16| 100788-04| BX62| 57A7701| BX64| 97J5801| H-1-3/16| 105616-02
8| 7.5| 1045| 1285| 1VP65x1-3/8| 78M7101| BK90H x 1-7/16| 100788-04| BX64| 97J5801| 5VX670| 100245-21| H-1-3/16| 105616-02
10| 10| 1045| 1285| 1VP65x1-3/8| 78M7101| 1B5V86| 78M8301| 5VX660| 100245-20| 5VX670| 100245-21| B-1-3/16| 105616-01
11| 10| 1135| 1365| 1VP65x1-3/8| 78M7101| 1B5V80| 100240-05| 5VX660| 100245-20| 5VX660| 100245-20| B-1-3/16| 105616-01

Cooling Start-Up
IMPORTANT- The crankcase heater must be energized for 24 hours before attempting to start compressor. Set thermostat so there is no demand to prevent compressors from cycling. Apply power to unit.
NOTE: These units must not be used as a “construction heater” at any time during any phase of construction. Very low return air temperatures, harmful vapors and misplacement of the filters will damage the unit and its efficiency. Additionally, a unit which will be subject to cold temperatures when not in operation must have a vapor barrier installed to seal the duct connections. Failure to protect the unit from moisture laden air or harmful vapors (generated from the construction process and temporary combustion heating equipment) will cause corrosive condensation within the unit. Failure to properly protect the unit in this situation will cause electrical and electronic component failure and could affect the unit warranty status.

A-Preliminary Checks

1. Make sure that unit is installed in accordance with the installation instructions and applicable codes.
2. Inspect all electrical wiring, both field‐ and factory‐installed, for loose connections. Tighten as required.
3.  Check to ensure that refrigerant lines do not rub against the cabinet or against other refrigerant lines.
4. Check voltage at disconnect switch. Voltage must be within range listed on nameplate. If not, consult power company and have voltage condition corrected before starting unit.
5.  Make sure filters are in place before start‐up.

B-Start-Up
Supply Air Staged Blower – Refer to the Multi-Staged Air Volume Start-Up section.

1. Initiate first and second stage cooling demands using this mobile service app menu path:
   SERVICE > TEST > COOLING > COOL3 Instructions provided with the thermostat may also be used to initiate cooling.

2. First-stage thermostat demand will energize indoor blower in Low Cooling CFM. Second-stage thermostat demand will energize indoor blower in High Cooling CFM. Both demands energize compressor 1. The remaining compressors will be energized to modulate the discharge air temperature.

3. Units contain two refrigerant circuits or systems.

4. Each refrigerant circuit is separately charged with R410A refrigerant. See unit rating plate for correct amount of charge.

5.  Refer to the Refrigerant Check and Charge section to check refrigerant charge..

C-R410A Refrigerant
Units charged with R410A refrigerant operate at much higher pressures than R22. The expansion valve and liquid line drier provided with the unit are approved for use with R410A. Do not replace them with components designed for use with R22. R410A refrigerant is stored in a pink cylinder.

IMPORTANT
Mineral oils are not compatible with R410A. If oil must be added, it must be a polyol ester oil.
Manifold gauge sets used with systems charged with R410A refrigerant must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0-800 on the high side and a low side of 30” vacuum to 250 psi with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating.

D-Refrigerant Charge and Check – Fin/Tube Coil
WARNING- Do not exceed nameplate charge under any condition.
This unit is factory charged and should require no further adjustment. If the system requires additional refrigerant, reclaim the charge, evacuate the system and add required nameplate charge.
NOTE: System charging is not recommended below 60°F (15°C). In temperatures below 60°F (15°C), the charge must be weighed into the system.
If weighing facilities are not available, or to check the charge, use the following procedure:
IMPORTANT: Charge unit in normal cooling mode.

1. Attach gauge manifolds to discharge and suction lines. With the economizer disabled, operate the unit in cooling mode at high speed using the following mobile service app menu path:
   SERVICE>TEST>COOL>COOL 3

2.  Use a thermometer to accurately measure the outdoor ambient temperature.

3. Apply the outdoor temperature to tables 5 or 6 to determine normal operating pressures. Pressures are listed for sea level applications at 80°F dry bulb and 67°F wet bulb return air.

4.  Compare the normal operating pressures to the pressures obtained from the gauges. Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Correct any system problems before proceeding.

5. If discharge pressure is high, remove refrigerant from the system. If discharge pressure is low, add refrigerant to the system.

   • Add or remove charge in increments.
   • Allow the system to stabilize each time refrigerant is added or removed.

6. Use the following approach method along with the normal operating pressures to confirm readings.

180 Compressor 1 Frequency 56Hz – 581168-01

Outdoor Coil
En­tering Air Temp| Circuit 1| Circuit 2
---|---|---
Dis. + 10 **psig| Suc. + 5 psig| Dis. + 10 **psig| Suc. + 5 psig
65°F| 243| 133| 248| 132
75°F| 280| 137| 286| 135
85°F| 321| 141| 328| 138
95°F| 366| 144| 374| 140
105°F| 415| 146| 424| 143
115°F| 469| 149| 477| 146

240 Compressor 1 Frequency 68Hz – 581169-01

Outdoor Coil
En tering Air Temp

| Circuit 1| Circuit 2
---|---|---
Dis + 10 psig| Suc + 5 psig| Dis. + 10 **psig| Suc + 5 psig**
65 °F| 260| 135| 264| 135
75 °F| 297| 136| 304| 136
85 °F| 338| 138| 346| 138
95 °F| 384| 140| 394| 140
105 °F| 434| 142| 443| 142
115 °F| 485| 144| 494| 144

E-Charge Verification – Approach Method – AHRI Testing (Fin/Tube Coil)

1. Using the same thermometer, compare liquid temperature to outdoor ambient temperature. Approach Temperature = Liquid temperature (at outdoor coil outlet) minus ambient temperature.
2. Approach temperature should match values in table 7. An approach temperature greater than value shown indicates an undercharge. An approach temperature less than value shown indicates an overcharge.
3. The approach method is not valid for grossly over or undercharged systems. Use tables 5 through 6 as a guide for typical operating pressures.

APPROACH TEMPERATURES – FIN/TUBE COIL

5.0°F + 1
(2.8°C + 0.5)

240| 6°F + 1
(3.3°C + 0.5)|

6°F + 1
(3.3°C + 0.5)

F-Compressor Controls
See unit wiring diagram to determine which controls are used on each unit.

1. High Pressure Switch (S4, S7)
   The compressor circuit is protected by a high pressure switch which opens at 640 psig + 10 psig (4413 kPa + 70 kPa) and automatically resets at 475 psig + 20 psig (3275kPa + 138 kPa).

2.  Low Pressure Switch (S87, S88)
   The compressor circuit is protected by a low pressure switch. Switch opens at 40 psig + 5 psig (276 + 34 kPa) and automatically resets at 90 psig
   + 5 psig (621 kPa + 34 kPa).

3. Crankcase Heater (HR1, HR2)
   Units have compressors which contain a belly band compressor oil heater which must be on 24 hours before running compressors. Energize by setting thermostat so that there is no cooling demand, to prevent compressor from cycling, and apply power to unit.

4. Outdoor Fan Operation
   Outdoor fans 1, 2, and 3 are energized when compressor 1 is energized. As cooling demand increases, all six outdoor fans are energized.

Outdoor fans 2, 3, 5, and 6 are de-energized when outdoor temperature drops below 62°F (17°C).

Heating Start-Up (LDT)

FOR YOUR SAFETY READ BEFORE LIGHTING
BEFORE LIGHTING 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. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or 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. This unit is equipped with an automatic spark ignition system. There is no pilot. In case of a safety shutdown, move thermostat switch to OFF and return the thermostat switch to HEAT to reset ignition control.

WARNING
Electric shock hazard. Can cause injury or death. Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water.

• Danger of explosion. Can cause injury or product or property damage. If overheating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electrical supply.

• Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

• SMOKE POTENTIAL
  The heat exchanger in this unit could be a source of smoke on initial firing. Take precautions with re­spect to building occupants and property. Vent ini­tial supply air outside when possible.

• Danger of explosion. Can cause injury or death. Do not attempt to light manually. Unit has a direct spark ignition system.
  A-Placing Unit In Operation

• Danger of explosion and fire. Can cause injury or product or property damage. You must follow these instructions exactly.

Gas Valve Operation for Honeywell VR8205Q /VR8305Q and White Rodgers 36H54

1.  Set thermostat to lowest setting.
2. Turn off all electrical power to appliance.
3.  This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.
4. Open or remove the heat section access panel.
5. Turn gas valve switch to OFF. See figure 17.
6.  Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you do not smell gas, go to the next step.
7. Turn gas valve switch to ON. See figure 17.
8. Close or replace the heat section access panel.
9. Turn on all electrical power to appliance.
10.  Set thermostat to desired setting.
11.  The ignition sequence will start.
12. If the appliance does not light the first time (gas line not fully purged), it will attempt up to two more ignitions before locking out.
13. If lockout occurs, repeat steps 1 through 10.
14. If the appliance will not operate, follow the instructions “Turning Off Gas to Appliance” and call your service technician or gas supplier.

Turning Off Gas to Unit

1.  If using an electromechanical thermostat, set to the lowest setting.
2. Before performing any service, turn off all electrical power to the appliance.
3.  Open or remove the heat section access panel.
4.  Turn gas valve switch to OFF.
5. Close or replace the heat section access panel.

WARNING
Danger of explosion. Can cause injury or death. Do not attempt to light manually. Unit has a direct spark ignition system.

Heating Operation and Adjustments

(Gas Units)
A-Heating Sequence of Operation

1. On a heating demand the combustion air inducer starts immediately.
2. Combustion air pressure switch proves inducer operation. After a 30-second pre-purge, power is allowed to ignition control. Switch is factory set and requires no adjustment.
3.  Spark ignitor energizes and gas valve solenoid opens.
4.  Spark ignites gas, ignition sensor proves the flame and combustion continues.
5. If flame is not detected after first ignition trial, ignition control will repeat steps 3 and 4 two more times before locking out the gas valve.
6. For troubleshooting purposes, an ignition attempt after lock out may be re-established manually. Move thermostat to “OFF” and return thermostat switch to “HEAT” position.

B-Limit Controls
Limit controls are factory-set and are not adjustable. Two limits are located on the drip shield in the blower compartment.

C-Heating Adjustment
Main burners are factory-set and do not require adjustment.
The following manifold pressures are listed on the gas valve.
Natural Gas Units – Low Fire – 1.6” w.c. (not adjustable
) Natural Gas Units – High Fire – 3.7” w.c.
LP Gas Units – Low Fire – 5.5” w.c. (not adjustable)
LP Gas Units – High Fire – 10.5” w.c.

Heating Start-Up (LHT)
Note: L1 & L2 reversing valves are de-energized with a heating demand. The heat pump will heat only, not cool.

1.  Set thermostat or temperature control device to initiate a first-stage heating demand.

2. A first-stage heating demand (W1) will energize compressors 1 and 2, the outdoor fans, and blower.
   Note: W1 will also energize optional factory- or field-installed electric heat during defrost to maintain discharge air temperature.

3.  A second-stage heating demand (W2) will energize optional electric heat.

Defrost Control
The defrost control ensures that the heat pump outdoor coil does not ice excessively during the heating mode. Defrost is enabled below 35°F. The Unit Controller will cycle in and out of defrost depending on the temperature difference between the outdoor coil and outdoor air temperature. If the system fails to calibrate or obtain readings for demand defrost, defrost will run- time at the field setting. Defrost is also initiated when the accumulated run time with the outdoor coil temperature below 35°F reaches six hours. Low gas heat (LDT) or electric heat (optional on LHT) is energized during defrost.
Note: Only one refrigerant circuit will go into defrost at a time.
Defrost Test or Forced Defrost Option−
A TEST option is provided for troubleshooting. The TEST mode may be started at any time using the mobile service app. Defrost mode may be started by entering the Defrost Mode in the Component Test Menu. When defrost is started, unit will run in Defrost Mode for a maximum of five minutes or when the outdoor coil reaches 100°F, whichever occurs first.

Multi-Staged Air Volume Start-Up
A- Design Specifications
Use table 8 to fill in field-provided, design specified blower CFM for appropriate unit. If only high and low cooling design specifications are provided, set the medium cooling CFM at the high or low cooling design spec or any CFM between.

B- Set Maximum CFM
Use table 8 to determine highest blower CFM for appropriate unit. Adjust the blower pulley to deliver that amount of CFM with only the blower operating. See Determining Unit CFM in the Blower Operation and Adjustment section.

C-Set Blower Speeds

1.  Use the following mobile service app menu to enter the blower design specified CFM into the Unit Controller. Make sure blower CFM is within limitations shown in table 9 or 10. Refer to the Unit Controller manual provided with unit.
   RTU MENU > RTU OPTIONS > BLOWER > SPEED

2. Enter the following design specifications as shown in table 8.
   Blower / Heat CFM Cooling High CFM Cooling Low CFM Vent CFM

3.  Adjust the blower RPM to deliver the target CFM based on the measured static pressure using the blower table.

4.  Measure the static pressure again and apply the static pressure and RPM to the blower tables to determine adjusted CFM.

5. Repeat adjustments until design CFM is reached.

D-Set Damper Minimum Position
To maintain required minimum ventilation air volumes when the unit is in the occupied mode, two minimum damper positions must be set. The Unit Controller will open the damper to “Min OCP Blwr High” when blower CFM is at or ABOVE the “midpoint” CFM. The Unit Controller will open the dampers to “Min OCP Blwr Low” when blower CFM is BELOW a “midpoint” CFM. The Unit Controller will calculate the “midpoint” CFM.

Blower CFM Design Specifications

**** Unit

| T ‘Stat or Zone
Con­trol Stages| Blower Speed| Design Specified CFM
---|---|---|---

180

| 2| Htg.|
Clg. High|
Clg. Low|
Ventilation|

240

| 2| Htg.|
Clg. High|
Clg. Low|
Ventilation|

• Available blower speeds vary by unit and thermostat stages.

Set Minimum Position 1
Use the following mobile service app menu to set “Min OCP Blwr High” for the blower CFM above the “midpoint” CFM. When navigating into this menu, the Unit Controller will run damper calibration and allow damper position adjustment.
RTU MENU > SETTINGS > RTU OPTIONS > DAMPER
Tap “Next” to skip tabs and complete damper position calibration until “Damper Calibration Blower Speed High” tab appears. Measure the intake air CFM. If the CFM is lower than the design specified CFM for ventilation air, use the Unit Controller to increase the damper percent open. If the CFM is higher than specified, decrease the damper percent open.
Note: Intake air CFM can also be determined using the outdoor air temperature, return air temperature and mixed air temperature. Refer to the economizer or outdoor air damper installation instructions.

HEATING, VENTILATION & SMOKE MINIMUM AND MAXIMUM CFM

Max
LDT180H| Low| L| 6000| 2725| 7200| 6000| 2250| 7200| 6000| 2250| 7200
Std| S| 4325
Med| M| 4500
High| H| 5125
LHT180H| HP W/O EH| N| 4500
15, 30, 45, 60, 90 KW| E, J, K, L, P| 6000
LDT240H| Low, Std, Med| L, S, M| 8000| 4500| 9600| 8000| 3000| 9600| 8000| 3000| 9600
High| H| 5125
LHT240H| HP W/O EH| N| 6000
15, 30, 45, 60, 90 KW| E, J, K, L, P| 6000

• Use highest value between Heating and Cooling High CFM Max.

COOLING MINIMUM AND MAXIMUM CFM

LHT/ LDT
Unit

| Cooling Low CFM| Cooling High CFM
---|---|---
Default| Min| Max| Default| Min| Max
180H| 3900| 2000| 7200| 5400| 5000| 7200
240H| 5200| 3000| 9600| 7200| 6250| 9600

• Use Cooling High CFM Max.

Set Minimum Position 2
Use the following mobile service app menu in the Unit Controller to set “Min OCP Blwr Low” for the blower CFM below the “midpoint” CFM. When navigating into this menu, the Unit Controller will run damper calibration and allow damper position adjustment.
RTU MENU > SETTINGS > RTU OPTIONS > DAMPER
Tap “Next” to skip tabs and complete damper position calibration until “Damper Calibration Blower Speed High” tab appears. Measure the intake air CFM. If the CFM is lower than the design specified CFM for ventilation air, use the Unit Controller to increase the damper percent open. If the CFM is higher than specified, decrease the damper percent open.
Note: Intake air CFM can also be determined using the outdoor air temperature, return air temperature and mixed air temperature. Refer to the economizer or outdoor air damper installation instructions.

E-Inverter Bypass Option
The supply air inverter is factory-set to by-pass the inverter manually. To by-pass the inverter and operate the blower in the constant air volume mode, use the following Unit Controller menu and set to “engaged”:
SETTINGS > RTU OPTIONS > BLOWER > VFD BYPASS
To configure the unit to by-pass the inverter automatically, use the following Unit Controller menu.
SETUP > INSTALL
Press SAVE until the menu reads:
CONFIGURATION ID 1
Change the 6th character position to A for automatic bypass option.
Press SAVE
Caution: Units not equipped with an inverter will have the 6th character set to N, indicating the inverter is not bypassed. The blower motor could be damaged and/or result in product or property damage if the setting is changed to automatic or manual.

Multi-Staged Air Volume Operation

This is a summary of cooling operation. Refer to the sequence of operation provided in the Engineering Handbook or Service Manual for more detail.

A-Two-Stage Thermostat

1. Economizer With Outdoor Air Suitable
   Y1 Demand –
   Compressors Off
   Blower Cooling Low
   Dampers modulate
   Y2 Demand –
   Compressors Off
   Blower Cooling High
   Dampers Modulate
   Note: If dampers are at maximum open for three minutes, compressor 1 is energized low and blower stays on cooling high.

2. No Economizer or Outdoor Air Not Suitable
   Y1 Demand –
   Compressor 1 High
   lower Cooling Low
   Dampers Minimum Position
   Y2 Demand –
   Compressor 1 High, Compressor 2 On
   Blower Cooling High
   Dampers Minimum Position

B-Three-Stage Thermostat

1. Economizer With Outdoor Air Suitable
   Y1 Demand –
   Compressors Off
   Blower Cooling Medium
   Dampers Modulate
   Y2 Demand –
   Compressors Off
   Blower Cooling High
   Dampers Modulate
   Note : If dampers are at maximum open for three minutes, compressor 1 is energized low and blower stays on cooling high.
   Y3 Demand –
   Compressor 1 High
   Blower Cooling High
   Dampers Maximum Open

2. No Economizer or Outdoor Air Not Suitable
   Y1 Demand –
   Compressor 1 Low
   Blower Cooling Low
   Y2 Demand –
   Compressors 1 Low, Compressor 2 On
   Blower Cooling Medium
   Y3 Demand –
   Compressors 1 High, Compressor 2 On
   Blower Cooling High

Temperature Thermistor Sensors

Units are equipped with four factory-installed thermistors (RT46 – RT49) located on different points on the refrigerant circuit. The thermistors provide the Unit Controller with constant temperature readings of four specific locations on the refrigeration circuit. These temperatures are used as feedback in certain modes of unit operation. In addition, the Unit Controller uses these temperatures to initiate alarms such as loss of outdoor or indoor coil airflow and loss of charge. Each thermistor must be specifically placed for proper unit operation and to initiate valid alarms. for indoor coil location andfor outdoor coil location.

Service

The unit should be inspected once a year by a qualified service technician.

A-Filters
Units are equipped with six 24 X 24 X 2” filters. Filters should be checked monthly and replaced when necessary with filters of like kind and size. Take note of air flow direction marking on filter frame when reinstalling filters. NOTE: Filters must be U.L.C. certified or equivalent for use in Canada.

CAUTION
Label all wires prior to disconnection when servic­ing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

B-Lubrication
All motors are lubricated at the factory. No further lubrication is required. Blower shaft bearings are prelubricated. For extended bearing life, relubricate at least once every two years with a lithium base grease, such as Alvania 3 (Shell Oil), Chevron BRB2 (Standard Oil) or Regal AFB2 (Texas Oil). Use a hand grease gun for relubrication. Add only enough grease to purge through the bearings so that a bead of grease appears at the seal lip contacts.

C-Burners (Gas Units)
Periodically examine burner flames for proper appearance during the heating season. Before each heating season examine the burners for any deposits or blockage which may have occurred.
Clean burners as follows:

1. Turn off both electrical power and gas supply to unit.
2.  Open burner compartment access panel.
3.  Remove screws securing burner assembly to burner support and remove assembly.Clean as necessary.
4. Locate the ignitor under the left burners. Check ignitor spark gap with appropriately sized twist drills or feeler gauges.
5. Check the alignment of the ignitor and the sensor as shown and table 11.
6.  Replace burners and screws securing burner.
7.  Replace access panel.
8. Restore electrical power and gas supply. Follow lighting instructions attached to unit and use inspection port in access panel to check flame.

WARNING
Danger of explosion. Can cause injury or death. Do not overtighten main burner mounting screws. Snug tighten only.

Dimension

| Unit Btuh Input| Length – in. (mm)
---|---|---
Ignitor| Sensor
A| 260K| 7-3/4 (197)| 11 (279)
B| 360K| 5 (127)| 5-1/2 (140)
C| 480K| 2-1/4 (57)| 2-3/4 (70)

D-Combustion Air Inducer (Gas Units)
A combustion air proving switch checks combustion air inducer operation before allowing power to the gas controller. Gas controller will not operate if inducer is obstructed. Under normal operating conditions, the combustion air inducer wheel should be checked and cleaned prior to the heating season. However, it should be examined periodically during the heating season to establish an ideal cleaning schedule. With power supply disconnected, the condition of the inducer wheel can be determined by looking through the vent opening.
Clean combustion air inducer as follows:

1.  Shut off power supply and gas to unit.
2. Disconnect pressure switch air tubing from combustion air inducer port.
3. Remove and retain screws securing combustion air inducer to flue box. Remove and retain two screws from bracket supporting vent connector.
4. Clean inducer wheel blades with a small brush and wipe off any dust from housing. Clean accumulated dust from front of flue box cover.
5. Return combustion air inducer motor and vent connector to original location and secure with retained screws. It is recommended that the combustion air inducer gasket be replaced during reassembly.
6.  Clean combustion air inlet louvers on heat access panel using a small brush.

E-Flue Passageway and Flue Box (Gas Units)

1- Remove combustion air inducer assembly as described in section D.
2- Remove flue box cover. Clean with a wire brush as required.
3- Clean tubes with a wire brush.
4- Reassemble the unit. The flue box cover gasket and combustion air inducer gasket should also be replaced during reassembly.

F-Indoor Coil
Inspect and clean coil at beginning of each cooling season. Clean using mild detergent or commercial coil cleaner. Flush coil and condensate drain with water taking care not to get insulation, filters and return air ducts wet.

G-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated dirt or dust. Turn off power before attempting to remove access panel or to clean blower wheel.

H-Outdoor Coil
Clean outdoor coil annually with detergent or commercial coil cleaner and inspect monthly during the cooling season. Access panels are provided on front and back of outdoor section.

J-Indoor Air Quality (CO2)Sensor
The Unit Controller uses input (CO2 levels) from the optional sensor to adjust dampers and maintain specified amounts of fresh outdoor air. K-Needlepoint Bipolar Ionizer
The optional, brush-type ionizer produces positive and negative ions to clean air and reduce airborne contaminants. The ionizer was designed to be low maintenance. The device should be checked semi-annually to confirm the brushes are clean for maximum output. The ionizer is located behind the filters.

1.  Remove filters, screws securing the top and bottom of the upper filter bracket, and the wire ties the screws hold in place. See figure 27.
2.  Disconnect the ionizer plug near the top of the filter rack.
3.  Pull ionizer out of unit and clean brushes.
4. Replace ionizer, reconnect ionizer plug, and replace filters, screws, and wire ties.

L-UVC Light (Optional)
When field-installed, use only UVC Light Kit assembly 106883-01 (21A94) with this appliance. Factory-Installed UVC Light When the UVC light is factory installed, the lamp is shipped in a foam sleeve. The lamp is attached to the UVC light assembly on the blower deck. Remove the lamp and install into the UVC light assembly as shown in steps 2 through 11 as follows.
Annual Lamp Replacement

WARNING
Personal Burn Hazard. Personal injury may result from hot lamps. During replacement, allow lamp to cool for 10 minutes be­fore removing lamp from fixture.
The lamp should be replaced every 12 months, as UVC energy production diminishes over time.

1. Obtain the correct model germicidal light replacement lamp 101087-02.
2.  Disconnect power to the rooftop unit before servicing the UVC kit.
3.  Open the blower access door.
4. Disconnect the UVC cable quick connects (black/white).
5. Remove and retain the (3) mounting screws securing the UVC assembly. Carefully remove the complete UVC assembly out through the blower access door.
6. Allow 10 minutes before touching the lamps. Then, carefully remove the lamp splash guards (and lamp for annual replacement) from each of the lamp holders.
7. Wear cotton gloves or use a cotton cloth when handling the new lamp. Gently but firmly push in the splash guards on each end of the lamp. Align and insert the lamp with splash guard into the lamp holders of the UVC assembly until each end clicks into place.
8. Carefully place the UVC assembly on the blower deck. Line up the mounting holes on the UVC assembly with the mounting holes on the blower deck. Use the retained #10 screws to attach the UVC assembly in place.
9.  Close the blower access door.
10. Reconnect power to the rooftop unit.
11.  Open the filter access door and look through the view port in the triangular sheet-metal panel to verify that the UVC light is on.

For all maintenance, contact a licensed HVAC technician. If UVC lamp does not come on:

1. Check Power Wiring: Disconnect 1/4” QC (quick connects) of the UVC cable near the UVC assembly. With Power ON, use multimeter to test 110-230V at the 1/4”QC quick connects from the control panel.
2. Check Lamp: Carefully remove the UVC assembly out of the rooftop unit. Use multimeter to test for continuity across each pair of pins at each end of the lamp.
3. Check Lamp Installation: Make sure that lamp’s pins snap properly into the lamp holder.

Lamp Disposal
Hg-Lamp Contains Mercury – Manage in accordance with local, state and federal disposal laws. Refer to www.lamprecycle.org.
Proper Clean-up Technique in Case of Lamp Breakage Wear protective gloves, eye wear and mask. Sweep the broken glass and debris into a plastic bag, seal the bag, and dispose of properly. Contact your local waste management office for proper disposal. Do not use a vacuum cleaner. Do not incinerate.

Maintenance

• For all maintenance, contact a qualified HVAC technician.
• Read the maintenance instructions before opening unit panels.
• Unintended use of the unit or damage to the unit housing may result in the escape of dangerous UVC radiation. UVC radiation may, even in small doses, cause harm to the eyes and skin.
• Do not operate units that are obviously damaged.
• Do not discard the triangular UVC light shield or any barriers with an ultraviolet radiation symbol.
• Do not override the door interlock switch that interrupts power to the UVC light.
• Do not operate the UVC light outside of the unit.

Factory Unit Controller Settings
Use the mobile service app to adjust parameters; menu paths are shown in each table. Refer to the Unit Controller manual provided with each unit. Tables 12 through 14 show factory settings (in degrees, %of fan CFM, etc.). Record adjusted settings on the label located inside the compressor access panel. When field installing optional kits and accessories, the Unit Controller must be configured to identify the option before it will function.
to determine whether the Unit Controller configuration I.D. must change. To configure the option, use MAIN MENU > SETUP > INSTALL menu path. Press SAVE until CONFIGURATION ID 1 or 2 appears depending on the option installed. Change the appropriate character in the configuration I.D. For example, when an economizer is installed using a single enthalpy sensor, change configuration I.D. 1, the second character, to “S”.

Units With BACnet Module Settings

RTU Menu > Network Integration > Network Setup Wizard > BACnet MS/TP > See BACnet MAC Address
BACNET MAC ADDRESS:
Units With Room Sensor, CPC/LSE Gateway Settings
RTU Menu > Network Integration > Network Setup Wizard > SBUS > Set SBUS Address
LCONN ADDRESS:
Units With LonTalk Settings

Use menu RTU Menu > Network Integration > Network Setup Wizard

Set “LONTALK”
Staged Blower Parameters

Para meter| Factory Setting| Field Setting| Description
180H| 240H
Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings.
Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS
 12| 6000
CFM| 8000
CFM| CFM| Blower CFM during smoke detection.
SETUP > TEST & BALANCE (can also use SETTINGS > RTU OPTIONS > BLOWER > SPEEDS)
17| 3900
CFM| 5200
CFM| CFM|  Blower CFM during COOLING LOW operation.
 14| 5400
CFM| 7200
CFM|  CFM|  Blower CFM during COOLING HIGH operation.
13| 6000
CFM| 8000
CFM|  CFM|  Blower CFM during Heating operation.
18| 6000
CFM| 8000
CFM| CFM| Blower CFM during ventilation.
SETUP > TEST & BALANCE (can also use SETTINGS > RTU OPTIONS > DAMPER)
9| 0%| 0%| %| Damper min. position during LOW blower operation.
132| 0%| 0%| %| Damper min. position during HIGH blower operation.
215| 50%| 50%| %| Min. damper % for stg 1 power exhaust operation.
SETTINGS > RTU OPTIONS > EDIT PARAMETERS
 29|  101%|  101%|  %Open| Damper minimum position during G blower operation. (Setting parameter 29 to “101” disables param­ eter 29 and passes control to parameter 9 or 132)
219| 75%| 75%| %| Min. damper % for stg 2 power exhaust operation.
216| 10%| 10%| %| Deadband % for stage 1 power exhaust operation.
220| 10%| 10%| %| Dead band % for stage 2 power exhaust operation.
224| 100| 100| Sec| Stage 1 power exhaust off-delay in seconds.
30| 70%| 70%| %Speed| Minimum blower speed % for stage 2 power exhaust operation.

START-UP REPORT
Job Name:____
Store No.Start-Up Date:__
Address:_
City: ____ State:__
Start-Up Contractor:____
Technician:_
Model No.:___
Serial No.:____
TU No.:____ Catalog No.:__

Inspections and Checks

Damage?          Yes      No            R22 □ R410A □
If yes, reported to: _
Verify factory and field-installed accessories. Check electrical connections. Tighten if necessary.
Supply voltage: L1-L2 L1-L3 L2-L3
_If unit contains a 208-230/240 volt transformer: Check primary transformer tap □
Transformer secondary voltage: __
Cooling Checks

Compressor Rotation □    Ambient Temp. Return Air Temp. Supply Air Temp. __
| Compressor Amps| Compressor Volts| Pressures| Outdoor Fan Amps| CC Heater Amps
L1| L2| L3| L1-L2| L1-L3| L2-L3| Disch.| Suct.| L1| L2| L3| L1
1| | | | | | | | | | | |
2| | | | | | | | | | | |
3| | | | | | | | | | | |
4| | | | | | | | | | | |
| | | | | | | | | | | |
| | | | | | | | | | | |
Blower Checks

Pulley/Belt Alignment    □ Blower Rotation           □
Set Screws Tight          □ Belt Tension                □
Nameplate Amps: Volts: _
_Motor            Amps                              Volts
L1          L1-L2 _
_L2          L1-L3 _
_L3          L2-L3 __
Heating Checks – Gas

Fuel type: Nat. □ LP □ Inlet Pressure: in. w.c.
Return Air Temp.: Supply Air Temp.:  Altitude: Primary Limits Operate: □
CO2 %:
Gas Valve| Manifold Pressure
Low Fire| High Fire
GV1| |
GV2| |
Control Type

Heating Checks – Electric

Return Air Temp.: _ Supply Air Temp.:
_Limits Operate: □
| Amps
L1| L2| L3| | L1| L2| L3
1| | | | 10| | |
2| | | | 11| | |
3| | | | 12| | |
4| | | | 13| | |
5| | | | 14| | |
6| | | | 15| | |
7| | | | 16| | |
8| | | | 17| | |
9| | | | 18| | |
Accessory Checks

Power Exhaust Amps
1 2        None □
Economizer Operation
Min. Pos. □             Motor travel full open/close     □

References

• Lamp Recycle – Environmental Responsiblility Starts Here

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