Table of Contents
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2022
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
LGT/LCT036, 048,
060, 072
3, 4, 5 and 6 Ton
GAS AND COOLING PACKAGED UNITS
508286-01
7/2022
To prevent serious injury or death:
1-
Lock-out/tag-out before performing maintenance.
2-
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.
3-
Always keep hands, hair, clothing, jewelry, tools, etc.,
away from moving part
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Related Manuals for Lennox LGT036
Summary of Contents for Lennox LGT036
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Page 1: Table Of Contents
2022 INSTALLATION INSTRUCTIONS WARNING Improper installation, adjustment, alteration, ser LGT/LCT036, 048, vice or maintenance can cause property damage, personal injury or loss of life. Installation and ser 060, 072 vice must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier 3, 4, 5 and 6 Ton GAS AND COOLING PACKAGED UNITS... -
Page 2: Dimensions
CAUTION 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. LGT/LCT036, 048, 060, 072 DIMENSIONS in. - Gas heat section shown 5−5/8 16−1/4 (143) -
Page 3: Parts Arrangements
LGT036, 048, 060, & 072 PARTS ARRANGEMENT BLOWER REHEAT COIL EVAPORATOR (DIRECT DRIVE) (OPTIONAL) COIL CONDENSER FILTERS (4) 20 X 20 X 2” COIL GUARDS (OPTIONAL) ECONOMIZER (OPTIONAL) 8.8.8.8 CONDENSER COIL CONDENSATE DRAIN COMBUSTION AIR INDUCER BURNERS GAS VALVE UNIT... -
Page 4: Shipping And Packing List
Shipping and Packing List NOTICE Package 1 of 1 contains: Roof Damage! 1- Assembled unit This system contains both refrigerant and oil. Check unit for shipping damage. Receiving party should Some rubber roofing material may absorb oil, contact last carrier immediately if shipping damage is found. causing the rubber to swell. -
Page 5: Unit Support
Use of this unit as a construction heater or air conditioner A-Downflow Discharge Application is not recommended during any phase of construction. Roof Mounting with T1CURB / C1CURB / E1CURB Very low return air temperatures, harmful vapors and 4- The roof mounting frame must be installed, flashed operation of the unit with clogged or misplaced filters will and sealed in accordance with the instructions damage the unit. -
Page 6: Duct Connection
Duct Connection Horizontal Air Discharge Unit is shipped with panels covering the horizontal supply All exterior ducts, joints and openings in roof or building and return air openings. Remove horizontal covers and walls must be insulated and weather-proofed with place over downflow openings for horizontal air discharge. flashing and sealing compounds in accordance with See figure 3. -
Page 7: Condensate Drains
Units are shipped with the drain coupling facing the front Condensate Drains of the unit. Condensate can be drained from the back or bottom of the unit with the following modifications. The Make drain connection to the drain coupling provided on unit can be installed in either downflow or horizontal air unit. -
Page 8: Gas Piping
3- Make sure the cap over the unit bottom drain hole is Connect Gas Piping (Gas Units) secure. Before connecting field-provided piping, check with gas 4- Rotate the drain pan until the downward slope is company or authorities having jurisdiction for local code toward the back of the unit. -
Page 9: Pressure Test Gas Piping
Pressure Test Gas Piping (Gas Units) OUTSIDE OF UNIT GAS PIPE CONNECTION TO GAS When pressure testing gas lines, the gas valve must VALVE be disconnected and isolated. Gas valves can be damaged if subjected to more than 0.5 psig (3.48kPa). See figure 13. -
Page 10: High Altitude Derate
1- Units are factory-wired for 230 / 460 / 575 volt supply. High Altitude Derate For 208V supply, remove the insulated terminal cover Locate the high altitude conversion sticker in the unit from the 208V terminal on the control transformer. literature bag. - Page 11 Wire runs over 150 feet (mm): Use a local, isolated 24VAC transformer such as Use18 AWG wire for all applications using remotely Lennox cat #18M13 (20VA minimum) to supply power installed electro-mechanical electronic to RH sensor as shown in figure 19. Use two shielded thermostats.
- Page 12 FIELD WIRING WITH ELECTRONIC AND ELECTRO-MECHANICAL THERMOSTATS (Thermostat Mode) 24 V POWER P297 J297A TO UNIT CONTROLLER THERMOSTAT INPUTS TO R TO G K55−1 TO Y1 OTHER THERMOSTAT SIGNALS REMAIN CONNECTED AS SHOWN ON THE RIGHT. TO PROVIDE SUPERMARKET REHEAT SCHEME USE S86 DEHUMIDISTAT AND K55.
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Page 13: Blower Operation And Adjustments
FIELD WIRING REHEAT UNITS WARNING (Using A Humidity Sensor With More than 150 Ft. Wire Runs) 1-Make sure that unit is installed in accordance with the installation instructions and applicable codes. CONNECTED ISOLATED 24V 2-Inspect all electrical wiring, both field‐ and factory‐ TRANSFORMER installed, for loose connections. - Page 14 LOCATION OF STATIC PRESSURE READINGS INSTALLATIONS WITH DUCTWORK INSTALLATIONS WITH CEILING DIFFUSERS ROOFTOP UNIT ROOFTOP UNIT RETURN AIR READING LOCATION RETURN AIR READING RE RE LOCATION SUPPLY SUPPLY TURN TURN FIRST BRANCH OFF OF MAIN RUN MAIN DUCT RUN SUPPLY AIR SUPPLY AIR READING READING...
- Page 15 TABLE 4 BLOWER PARAMETER SETTINGS - 581102-01 Field Parameter Description Setting Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OP TIONS > EDIT PARAMETERS = 12 for EBM, 6 for ECM BLOWER SMOKE CFM % Percentage of torque for blower smoke speed.
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- Page 20 B LO WER D ATA FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g. Wet Indoor Coil Gas Heating Filters Reheat Electric Volume Economizer Standard Medium High MERV Coil Heat 036, 048 060, 072 MERV 8 MERV 13 Heat Heat Heat 0.01...
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Page 21: Cooling Start-Up
2- Compare the normal operating pressures to the Cooling Start-Up pressures obtained from the gauges. Check unit A-Operation components if there are significant differences. 1- Initiate full load cooling operation using the following 3- Measure the outdoor ambient temperature and the mobile service app menu path: suction pressure. - Page 22 TABLE 5 036 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581061-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc...
- Page 23 TABLE 6 048 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581062-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc...
- Page 24 TABLE 7 060 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581063-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc...
- Page 25 TABLE 8 072 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581064-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc...
- Page 26 TABLE 9 036 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581108-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig)
- Page 27 TABLE 10 048 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581109-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig)
- Page 28 TABLE 11 060 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581110-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig)
- Page 29 TABLE 12 072 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581111-01 Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig)
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Page 30: Prognostic & Diagnostic Sensors
Each thermistor must be specifically placed for proper Diagnostic Sensors unit operation and to initiate valid alarms. See table 13 for Units are equipped with two factory-installed thermistors proper locations. (RT46 and RT48) located on different points on the TABLE 13 refrigerant circuit. - Page 31 LGT/LCT 036, 048, 060, 072 EVAPORATOR COIL RT46 22J06 YELLOW RT46 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 21 Page 31 LGT/LCT036, 048, 060, 072...
- Page 32 LGT/LCT036, 048, 060, 072 CONDENSER COIL RT48 23V50 YELLOW RT48 DETAILS NOT TO SCALE FIGURE 22 Page 32 LGT/LCT036, 048, 060, 072...
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Page 33: Cooling Operation
Y2 Demand - Cooling Operation Compressor Low A-Two-Stage Thermostat Blower High 1-Economizer With Outdoor Air Suitable Dampers Full Open Y1 Demand - Note - Compressor is energized after damper has been Compressor Off at full open for three minutes. Blower Low Y3 Demand - Dampers Modulate Compressor High... -
Page 34: Warning
This unit is equipped with an automatic spark ignition Gas Heat Start-Up (Gas Units) system. There is no pilot. In case of a safety shutdown, move thermostat switch to OFF and return the thermostat FOR YOUR SAFETY READ BEFORE LIGHTING switch to HEAT to reset ignition control. -
Page 35: Heating Operation And Adjustments
12- If the furnace does not light the first time (gas line not C-Limit Controls fully purged), it will attempt up to two more ignitions Limit controls are factory-set and are not adjustable. The before locking out. primary limit is located to the right of the combustion air 13- If lockout occurs, repeat steps 1 through 10. -
Page 36: Hot Gas Reheat Startup
Check-Out Hot Gas Reheat Start-Up And Operation Test reheat operation using the following procedure. General 1- Make sure reheat is wired as shown in wiring section. Hot gas reheat units provide a dehumidifying mode of 2- Make sure unit is in local thermostat mode. operation. - Page 37 REHEAT MODE REFRIGERANT ROUTING RETURN OUTDOOR EVAPORATOR EXPANSION COIL VALVE REHEAT COIL SUPPLY COMPRESSOR CONDENSER COIL CHECK VALVE REHEAT VALVE FIGURE 24 COOLING MODE REFRIGERANT ROUTING RETURN OUTDOOR EVAPORATOR EXPANSION COIL VALVE REHEAT COIL SUPPLY COMPRESSOR CONDENSER COIL CHECK VALVE REHEAT VALVE FIGURE 25...
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Page 38: Service
Service REMOVE FILTERS The unit should be inspected once a year by a qualified service technician. WARNING Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, PULL TO turn the electrical power to unit OFF at REMOVE disconnect switch(es). - Page 39 BURNER ORIENTATION BURNER BOX ASSEMBLY One- and Two-Stage Heat Single- and Two-Stage 150,000 BTUH - 7 BURNERS REMOVE INDIVIDUAL BURNERS ON OLDER UNITS; REMOVE THE ENTIRE BURNER ASSEMBLY ON NEWER UNITS. SENSOR IGNITOR FLAME 108,000 BTUH - 5 BURNERS SENSOR SENSOR IGNITOR 65,000 BTUH - 3 BURNERS...
- Page 40 D-Combustion Air Inducer (Gas Units) E-Flue Box (Gas Units) A combustion air proving switch checks combustion air Remove flue box cover only when necessary for inducer operation before allowing power to the gas equipment repair. Clean inside of flue box cover and heat controller.
- Page 41 J-Needlepoint Bipolar Ionizer (Optional) REMOVE IONIZER RETAIN THE SCREW TO SECURE THE The optional, brush-type ionizer produces positive and BACK SIDE OF THE IONIZER BRACKET negative ions to clean air and reduce airborne contaminants. The ionizer was designed to be low REMOVE THE TOP RIGHT SCREW maintenance.
- Page 42 K-UVC Light (Optional) 5- Remove the (2) mounting screws of the UVC assembly. Carefully slide the complete UVC When field-installed, use only UVC Light Kit assembly assembly out through the blower access door. 106881-01 (21A92) with this appliance. 6- Allow 10 minutes before touching the lamps. Then, Factory-Installed UVC Light carefully remove the old lamp from the lamp holder When the UVC light is factory installed, the lamp is...
- Page 43 HS = High Static Blower Option Do not use a vacuum cleaner. Do not incinerate. TABLE 15 REPLACEMENT FUSES LGT036 Unit Voltage 208/230V - 1 Ph 208/230V - 3 Ph 460V - 3Ph 575V - 3Ph Power Exhaust Option W / P.E.
- Page 44 LGT048 Unit Voltage 208/230V - 1 Ph 208/230V - 3 Ph 460V - 3Ph 575V - 3Ph Power Exhaust Option W / P.E. W / O P.E. W / P.E. W / O P.E. W / P.E. W / O P.E. W / P.E.
- Page 45 LGT072 Unit Voltage 208/230V - 3 Ph 460V - 3Ph 575V - 3Ph Power Exhaust Option W / P.E. W / O P.E. W / P.E. W / O P.E. W / P.E. W / O P.E. Diagram Class Blower Type Amps 7.5A 7.5A...
- Page 46 LCT048 Electric Heat Size 7.5 KW 15 KW 208/230V 208/230V 460V - 575V - 208/230V - 208/230V 460V - 575V - Unit Voltage - 1 Ph - 3 Ph 1 Ph - 3 Ph Power Exhaust W / O W / O W / O W / O W / O...
- Page 47 LCT060 Electric Heat Size 7.5 KW 15 KW 208/230V 208/230V 460V - 575V - 208/230V - 208/230V 460V - 575V - Unit Voltage - 1 Ph - 3 Ph 1 Ph - 3 Ph W / O W / O W / O W / O W / O...
- Page 48 LCT072 Electric Heat Size 7.5 KW 15 KW 208/230V - 3 208/230V - 3 Unit Voltage 460V - 3Ph 575V - 3Ph 460V - 3Ph 575V - 3Ph Power Exhaust W / O W / O W / O W / O W / O W / O P.E.
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Page 49: Factory Unit Controller Settings
TABLE 16 Factory Unit Controller Settings 581038 Use the mobile service app to adjust parameters; menu Units With BACnet Settings paths are shown in each table. Refer to the Unit Controller RTU Menu > Network Integration > Network Setup Wizard > BACnet MS/TP >... - Page 50 M = Manual Bypass Power Exhaust Control [4] U = Unconfigured Not Installed = N Damper Position = A [5] Network Module A34 Pressure Sensor = C N = Not Installed L = LonTalk (Lennox) FIGURE 36 Page 50 LGT/LCT036, 048, 060, 072...
- Page 51 Phase / Voltage Detection * [5] [6] IAQ Options Not Installed = N N = Not Installed Enabled Internal (Lennox) = 1 1 = UV Lamp Installed External (A42) Phase Detection = 2 2 = Bipolar Ionizer Installed on DI-2...
- Page 52 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...