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E2023
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier
Table of Contents
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RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
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.
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Attention!
Look for the following icon.
INSTALLATION
INSTRUCTIONS
LHT/LDT156
LHT/LDT180
LHT/LDT240
HEAT PUMP AND DUAL-FUEL PACKAGED UNITS
508336-01
4/2023
Supersedes 1/2003
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As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
(13 Ton)
(15 Ton)
(20 Ton)
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Related Manuals for Lennox LHT156
Summary of Contents for Lennox LHT156
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Page 1: Table Of Contents
E2023 INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, ser vice or maintenance can cause property damage, LHT/LDT156 (13 Ton) personal injury or loss of life. Installation and ser vice must be performed by a licensed professional LHT/LDT180 HVAC installer or equivalent, service agency, or the (15 Ton) gas supplier LHT/LDT240... -
Page 2: Dimensions
WARNING To prevent serious injury or death: Lock-out/tag-out before performing maintenance. If system power is required (e.g., smoke detector mainte nance), disable power to blower, remove fan belt where applicable, and ensure all controllers and thermostats are set to the “OFF” position before performing maintenance. -
Page 3: Parts Arrangements
LHT156, 180, 240 PARTS ARRANGEMENT INDOOR FILTERS COIL (SIX - 24 X 24 X 2”) OUTDOOR BLOWERS FANS ECONOMIZER DAMPERS (OPTIONAL) BLOWER MOTOR BLOWER INVERTER 8.8.8.8 UNIT CONTROLLER CONDENSATE DRAIN OUTDOOR COILS COMPRESSORS DISCONNECT (FACTORY-INSTALLED ELECTRIC OPTION) HEAT LDT156, 180, 240 PARTS ARRANGEMENT... -
Page 4: Shipping And Packing List
Shipping and Packing List Requirements Package 1 of 1 contains: 1- Assembled unit See figure 1 for unit clearances. Check unit for shipping damage. Receiving party should contact last carrier immediately if shipping damage is found. General UNIT CLEARANCES These instructions are intended as a general guide and Optional do not supersede local codes in any way. -
Page 5: Unit Support
NOTICE IMPORTANT Roof Damage! The Clean Air Act of 1990 bans the intentional vent ing of refrigerant (CFC's and HCFC's) as of July 1, This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, 1992. Approved methods of recovery, recycling or causing the rubber to swell. -
Page 6: Duct Connection
5- Units require support along all four sides of unit base. Rigging Unit For Lifting Supports must be constructed of steel or suitably Rig unit for lifting by attaching four cables to holes in unit treated wood materials. base rail. See figure 2. NOTE-When installing a unit on a combustible surface for downflow discharge applications, an LARMF18/36 roof 1- Detach wooden base protection before rigging. -
Page 7: Condensate Drains
Condensate Drains CONDENSATE DRAIN CONNECTION Remove cap and make drain connection to the 1” CAULK AROUND NOTE - Allow clearance to N.P.T. drain coupling provided on unit. A trap must be CONDENSATE open doors when installing installed between drain connection and an open vent COUPLING condensate piping. -
Page 8: Gas Piping
Connect Gas Piping BOTTOM ENTRY GAS PIPING TO GAS Before connecting piping, check with gas company or VALVE authorities having jurisdiction local code requirements. When installing gas supply piping, length of run from gas meter must be considered in determining pipe size for 0.5”... -
Page 9: High Altitude Derate
Download Mobile Service App PRESSURE TEST GAS LINE A-Mobile Device Requirements S Android hardware requires 2GB RAM and a 2Ghz MANUAL MAIN core processor. Tablets are supported. SHUT-OFF VALVE S Minimum Android 6.0 (Marshmallow) or higher. Recommend Android 10 and Apple products require iOS version 11 or higher. -
Page 10: Electrical Connections - Power Supply
B-Unbalanced Three-Phase Voltage Electrical Connections - Power Supply Units equipped with an inverter (VFD) are designed to operate on balanced, three-phase power. Operating units A-Wiring on unbalanced three-phase power will reduce the Route field wiring in conduit between bottom power entry reliability of all electrical components in the unit. - Page 11 C-Wire Connections 2- Zone Sensor Mode - The Unit Controller will operate the unit from a The Unit Controller will operate heating and cooling thermostat or zone sensor based on the System Mode. based on the Unit Controller internal setpoints and the temperature from the A2 zone sensor.
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Page 12: Blower Operation And Adjustments
Blower Operation and Adjustments WARNING Supply Air Staged Units - The blower rotation will 1-Make sure that unit is installed in accordance with the always be correct on units equipped with an inverter. installation instructions and applicable codes. Checking blower rotation is not a valid method of 2-Inspect all electrical wiring, both field‐... - Page 13 4- The blower RPM can be adjusted at the motor pulley. TABLE 3 MINIMUM AND MAXIMUM PULLEY ADJUSTMENT Loosen Allen screw and turn adjustable pulley Belt Minimum Turns Open Maximum Turns Open clockwise to increase CFM. Turn counterclockwise to decrease CFM. See figure 12. Do not exceed A Section No minimum minimum and maximum number of pulley turns as...
- Page 14 D-Blower Belt Adjustment E-Check Belt Tension Overtensioning belts shortens belt and bearing life. Maximum life and wear can be obtained from belts only if Check belt tension as follows: proper pulley alignment and belt tension are maintained. Tension new belts after a 24-48 hour period of operation. 1- Measure span length X.
- Page 15 Page 15...
- Page 16 BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Efficiency Nominal hp Maximum hp Drive Kit Number RPM Range Standard 3.45 535 - 725 Standard 3.45 710 - 965 Standard 5.75 685 - 856 Standard 5.75 850 - 1045 Standard 5.75 945 - 1185 Standard...
- Page 17 TABLE 4 MANUFACTURER'S NUMBERS DRIVE COMPONENTS BELTS Drive ADJUSTABLE SHEAVE FIXED SHEAVE BELTS (STD.) SPLIT BUSHING H.P. (WITH TENSIONER) Supplier Supplier Supplier Supplier No. Supplier No. OEM Part No. Part No. Part No. Part No. Part No. 2, 3 1VP40x7/8 79J0301 BK95 x 1-3/16 105617-02...
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Page 18: Cooling Start-Up
1- Initiate first and second stage cooling demands using Cooling Start-Up this mobile service app menu path: IMPORTANT-The crankcase heater must be energized SERVICE > TEST > COOLING > COOL3 for 24 hours before attempting to start compressor. Set Instructions provided with the thermostat may also be thermostat so there is no demand to prevent used to initiate cooling. - Page 19 REFRIGERANT CIRCUITS INDOOR COIL CIRCUIT 1 & 2 ARE INTERLACED CIRCUIT 1 OUTDOOR COIL CIRUIT 2 OUTDOOR COIL FIGURE 15 D-Refrigerant Charge and Check - Fin/Tube Coil variations in these pressures may be expected due to differences in installations. Significant differences WARNING-Do not exceed nameplate charge under any condition.
- Page 20 TABLE 6 F-Compressor Controls 180 Compressor 1 Frequency 56Hz - 581168-01 See unit wiring diagram to determine which controls are Outdoor Circuit 1 Circuit 2 used on each unit. Coil En Dis. +10 Suc. +5 Dis. +10 Suc. +5 tering psig psig psig...
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Page 21: Gas Heat Start-Up (Ldt)
Heating Start-Up (LDT) WARNING FOR YOUR SAFETY READ BEFORE LIGHTING Danger of explosion. Can cause injury or death. Do not attempt to light manually. BEFORE LIGHTING smell all around the appliance area Unit has a direct spark ignition system. for gas. Be sure to smell next to the floor because some A-Placing Unit In Operation gas is heavier than air and will settle on the floor. -
Page 22: Heating Operation And Adjustments
11- The ignition sequence will start. C-Heating Adjustment 12- If the appliance does not light the first time (gas line Main burners are factory-set and do not require adjustment. not fully purged), it will attempt up to two more The following manifold pressures are listed on the gas valve. ignitions before locking out. -
Page 23: Defrost Control
hours. Low gas heat (LDT) or electric heat (optional on Defrost Control LHT) is energized during defrost. Note - Only one refrigerant circuit will go into defrost at a The defrost control ensures that the heat pump outdoor time. coil does not ice excessively during the heating mode. Defrost is enabled below 35°F. -
Page 24: Multi-Staged Air Volume Start-Up
TABLE 9 Multi-Staged Air Volume Start-Up Blower CFM Design Specifications A-Design Specifications T'Stat or Design Use table 9 to fill in field-provided, design specified blower Unit Blower Speed Zone Con Specified trol Stages CFM for appropriate unit. If only high and low cooling design specifications are Htg. - Page 25 TABLE 10 HEATING, VENTILATION & SMOKE MINIMUM AND MAXIMUM CFM Unit Heating CFM Vent CFM Smoke CFM Default Default Model Speed Heat Code Default 2725 4325 LDT156H 4500 6000 6250 5200 1950 62500 5200 1950 6250 HP W/O EH 3900 LHT156H 15, 30, 45, 60, 90 KW E, J, K, L,...
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Page 26: Multi-Staged Air Volume Operation
B-Three-Stage Thermostat Multi-Staged Air Volume Operation 1-Economizer With Outdoor Air Suitable This is a summary of cooling operation. Refer to the Y1 Demand - sequence of operation provided in the Engineering Compressors Off Handbook or Service Manual for more detail. Blower Cooling Medium A-Two-Stage Thermostat Dampers Modulate... -
Page 27: Temperature Thermistor Sensors
feedback in certain modes of unit operation. In addition, Temperature Thermistor Sensors the Unit Controller uses these temperatures to initiate Units are equipped with four factory-installed thermistors alarms such as loss of outdoor or indoor coil airflow and (RT46 - RT49) located on different points on the loss of charge. - Page 28 THERMISTOR LOCATION OUTDOOR COIL (RT48, RT49) YELLOW BLUE RT48 RT49 FIGURE 20 Page 28 LHT/LDT156, 180, 240...
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Page 29: Service
C-Burners (Gas Units) Service Periodically examine burner flames proper The unit should be inspected once a year by a qualified appearance during the heating season. Before each service technician. heating season examine the burners for any deposits or A-Filters blockage which may have occurred. Units are equipped with six 24 X 24 X 2”... - Page 30 Under normal operating conditions, the combustion air IGNITOR inducer wheel should be checked and cleaned prior to the SPARK GAP heating season. However, it should be examined SHOULD BE periodically during the heating season to establish an 1/8” (3mm) ideal cleaning schedule.
- Page 31 INDOOR AIR QUALITY (CO ) SENSOR HEAT EXCHANGER ASSEMBLY HEAT EXCHANGER TUBE COMBUSTION AIR INDUCER SUPPLY AND VENT RETURN AIR CONNECTOR IAQ SENSORS GAS VALVE BURNER FIGURE 25 E-Flue Passageway and Flue Box (Gas Units) 1- Remove combustion air inducer assembly as described in section D.
- Page 32 INSTALL IONIZER 20 TON SHOWN (5 IONIZERS) REMOVE THE SCREW SECURING THE TOP OF THE UPPER FILTER RACK BRACKET ONE EDGE PROTECTOR ON IONIZER BRACKET INDOOR COIL REMOVE THE SCREW SECURING THE BOTTOM OF TWO EDGE THE UPPER FILTER PROTECTORS ON RACK BRACKET FILTER RACK IONIZER...
- Page 33 L-UVC Light (Optional) 6- Allow 10 minutes before touching the lamps. Then, carefully remove the lamp splash guards (and lamp When field-installed, use only UVC Light Kit assembly for annual replacement) from each of the lamp 106883-01 (21A94) with this appliance. holders.
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Page 34: Unit Controller Parameter Settings
8- Carefully place the UVC assembly on the blower Factory Unit Controller Settings deck. Line up the mounting holes on the UVC Use the mobile service app to adjust parameters; menu assembly with the mounting holes on the blower paths are shown in each table. Refer to the Unit Controller deck. - Page 35 TABLE 15 - 581182-01 Staged Blower Parameters Factory Setting Para Field Description meter Setting 156H 180H 240H Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 5200 6000 8000...
- Page 36 Unconfigured = U U = Unconfigured Power Exhaust Control [4] [5] Network Module Not Installed = N N = Not Installed Damper Position = A L = LonTalk (Lennox) A34 Pressure Sensor = C FIGURE 30 Page 36 LHT/LDT156, 180, 240...
- Page 37 Phase / Voltage Detection * [5] [6] IAQ Options N = Not Installed N = Not Installed 1 = Enabled Internal (Lennox) 1 = UV Lamp Installed 2 = External (A42) Phase Detection 2 = Bipolar Ionizer Installed on DI-2...
- Page 38 START-UP REPORT Job Name:___________________________________ Inspections and Checks Store No.___________Start-Up Date:______________ R22 j R410A j Damage? If yes, reported to:____________________________ Address:_____________________________________ City:______________________________State:______ Verify factory and field-installed accessories. Start-Up Contractor:____________________________ Check electrical connections. Tighten if necessary. Technician:___________________________________ Supply voltage: L1-L2______L1-L3_____L2-L3_____ Model No.:___________________________________ If unit contains a 208-230/240 volt transformer: Serial No.:____________________________________ Check primary transformer tap j...