Lennox LGT156H Installation Instructions Manual
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Lennox LGT156H Installation Instructions Manual

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E2022
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
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.

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/LCT156
LGT/LCT180H
LGT/LCT210H
LGT/LCT240H
LGT/LCT300S
ROOFTOP PACKAGED UNITS
508288-01
9/2022
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(13 Ton)
(15 Ton)
(17.5 Ton)
(20 Ton)
(25 Ton)
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  • Page 1: Table Of Contents

    E2022 INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, ser­ vice or maintenance can cause property damage, LGT/LCT156 personal injury or loss of life. Installation and ser­ (13 Ton) vice must be performed by a licensed professional LGT/LCT180H HVAC installer or equivalent, service agency, or the (15 Ton) gas supplier LGT/LCT210H...

  • 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 LGT/LCT180H, 210H Unit Dimensions - Inches (mm) - Gas Heat Section Shown 133−1/8 (3394) 4−1/4 (108) 12−3/8 60−1/2 (1537) (314) 15 (381) BOTTOM RETURN 28−3/8 AIR OPENING (721) 91−1/8 BOTTOM SUPPL Y (2315) AIR OPENINGS 18 (457) ALTERNATE (THRU THE BASE) CONDENSATE DRAIN LOCATION 4−1/2 5−5/8 (143)
  • Page 4 LGT/LCT 240H & 300S Unit Dimensions - Inches (mm)- Gas Heat Section Shown 133−1/8 (3381) 4−1/4 (108) 12−3/8 60−1/2 (1537) (314) 15 (381) BOTTOM RETURN 28−3/8 AIR OPENING (721) BOTTOM SUPPL Y 91−1/8 AIR OPENINGS (2315) 18 (457) ALTERNATE (THRU THE BASE) CONDENSATE DRAIN LOCATION 4−1/2 5−5/8 (143)

  • Page 5: Parts Arrangements

    LGT156, 180, 210, 240, 300 PARTS ARRANGEMENT REHEAT CONDENSER FANS EVAPORATOR COIL FILTERS (3 ON 156, COIL (SIX - 24 X 24 X 2”) 4 ON 180, 210 6 on 240, 300) BLOWERS ECONOMIZER DAMPERS (OPTIONAL) BLOWER MOTOR BLOWER INVERTER 8.8.8.8 UNIT CONTROLLER...

  • Page 6: Shipping And Packing List

    Requirements installation. See figure 1 for unit clearances. The LGT156H gas/electric packaged rooftop unit is UNIT CLEARANCES available in 169, 000, 260,000, & 360,000 Btuh heating input. The LGT180, 210, 240, & 300 gas/electric Optional Outdoor packaged rooftop units are available in 260,000, Air Hood 360,000, or 480,000 Btuh heating inputs.

  • Page 7: 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 8: Duct Connection

    5- Units require support along all four sides of unit base. RIGGING Supports must be constructed of steel or suitably treated wood materials. *Weight LGT/LCT Unit Lbs. NOTE-When installing a unit on a combustible surface for 2499 1135 downflow discharge applications, an LARMF18/36 roof 2613 1186 mounting frame is required.

  • Page 9: Gas Piping

    CONDENSATE DRAIN CONNECTION OUTSIDE OF UNIT GAS PIPING TO GAS VALVE CAULK AROUND NOTE - Allow clearance to CONDENSATE open doors when installing COUPLING condensate piping. GROUND UNIT JOINT UNION Minimum Pitch MANUAL MAIN 1” (25 mm) per OPEN VENT SHUT-OFF VALVE 10' (3 m) of line Á...

  • Page 10: High Altitude Derate

    NOTE-Codes may require that manual main shut-off valve WARNING and union (furnished by installer) be installed in gas line external to unit. Union must be of the ground joint type. Danger of explosion. Can cause injury After all connections have been made, check all piping or product or property damage.

  • Page 11: Electrical Connections - Power Supply

    B-New Installations transformer. Move the wire from the transformer 240V terminal to the 208V terminal. Place the Once the app is downloaded, refer to the Setup Guide insulated terminal cover on the unused 240V provided with this unit to pair the app to the unit control terminal.

  • Page 12: Electrical Connections - Control Wiring

    TABLE 2 provided with thermostat. See figure 9 for field wiring INVERTER UP-SIZING and and refer to wiring diagrams on unit. Factory-Installed Inverter HP Replacement Inverter HP IMPORTANT-Terminal connections at the wall plate or subbase must be made securely. Loose control wire connections may result in intermittent operation.

  • Page 13: Blower Operation And Adjustments

    FIELD WIRING REHEAT UNITS (Using A Dehumidification Switch) Wire runs over 150 feet (mm): P299 Use a local, isolated 24VAC transformer such as Lennox cat #18M13 (20VA minimum) to supply power to RH DEHUMIDIFICATION DI−4 sensor as shown in figure 12. Use two shielded cables...
  • Page 14 Instructions provided with the thermostat may also be 1- Disconnect jack/plug connector to blower motor. Also used to initiate blower only (G) demand. Unit will cycle on disconnect jack/plug connector heating limit switches on gas units. thermostat demand. The following steps apply to applications using typical...
  • Page 15 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 16 D-Blower Belt Adjustment 2- Apply perpendicular force to center of span (X) with enough pressure to deflect belt 1/64” for every inch Maximum life and wear can be obtained from belts only if of span length or 1.5mm per 100mm of span length. proper pulley alignment and belt tension are maintained.
  • Page 17 BLOWER TABLES Page 17 508288-01 9/2022...
  • Page 18 Accessory Air Resistance Page 18 LGT/LCT156, 180, 210, 240, 300...
  • Page 19 MANUFACTURER'S NUMBERS Same as 508336. Not as of 12/5 markup. Page 19 508288-01 9/2022...

  • Page 20: Cooling Start-Up

    2- First-stage thermostat demand will energize indoor Cooling Start-Up blower in Low Cooling CFM and associated IMPORTANT-The crankcase heater must be energized first-stage compressors. Second-stage thermostat for 24 hours before attempting to start compressor. Set demand will energize indoor blower in High Cooling thermostat so there is no demand to prevent CFM and all remaining compressors.
  • Page 21 156 REFRIGERANT CIRCUITS EVAPORATOR COIL (not to scale) CIRCUIT 1 CIRCUIT 1 CONDENSER COIL CIRCUIT 2 CIRCUIT 2 CONDENSER COIL FIGURE 18 180 REFRIGERANT CIRCUITS ALL THREE EVAPORATOR COIL CIRCUITS ARE INTERTWINED EVAPORATOR COIL (not to scale) CIRCUIT 1 & 2 INTERTWINED CIRCUIT 2 &...
  • Page 22 210, 240, 300 REFRIGERANT CIRCUITS ALL FOUR EVAPORATOR COIL CIRCUITS ARE INTERTWINED EVAPORATOR COIL (not to scale) CIRCUITS 1 & 2 CONDENSER COIL INTERTWINED CIRCUITS 3 & 4 CIRCUIT 1 & 2 CONDENSER COIL INTERTWINED CIRCUIT 3 & 4 FIGURE 20 D-Refrigerant Charge and Check - All-Aluminum Coil variations in these pressures may be expected due to differences in installations.
  • Page 23 2- Add or remove charge in increments. Allow the 4- Example: At 95°F outdoor ambient and a measured system to stabilize each time refrigerant is added or suction pressure of 130psig, the target liquid removed. temperature is 98°F. For a measured liquid temperature of 106°F, add charge in increments until 3- Continue process...
  • Page 24 TABLE 4 156 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581081-01 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 25 156 CHARGING CURVE CIRCUIT 2 - NO REHEAT - ALL-ALUMINUM COIL - 581082-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 25 508288-01 9/2022...
  • Page 26 TABLE 5 156 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581083-01 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 27 156 CHARGING CURVE CIRCUIT 2 - REHEAT - ALL-ALUMINUM COIL - 581084-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 27 508288-01 9/2022...
  • Page 28 TABLE 6 180 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581085-01 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 29 180 CHARGING CURVE CIRCUIT 2 - NO REHEAT - ALL-ALUMINUM COIL - 581086-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 180 CHARGING CURVE CIRCUIT 3 - NO REHEAT - ALL-ALUMINUM COIL - 581086-01 Outdoor Temperature (°F) 115°...
  • Page 30 TABLE 7 180 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581087-01 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 31 180 CHARGING CURVE CIRCUIT 2 - REHEAT - ALL-ALUMINUM COIL - 581088-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 180 CHARGING CURVE CIRCUIT 3 - REHEAT - ALL-ALUMINUM COIL - 581088-01 Outdoor Temperature (°F) 115° 105°...
  • Page 32 TABLE 8 210 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581089-01 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 33 210 CHARGING CURVE CIRCUIT 2 - NO REHEAT - ALL-ALUMINUM COIL - 581090-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 210 CHARGING CURVE CIRCUIT 3 - NO REHEAT - ALL-ALUMINUM COIL - 581090-01 Outdoor Temperature (°F) 115°...
  • Page 34 210 CHARGING CURVE CIRCUIT 4 - NO REHEAT - ALL-ALUMINUM COIL - 581090-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 34 LGT/LCT156, 180, 210, 240, 300...
  • Page 35 TABLE 9 210 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581091-01 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 36 210 CHARGING CURVE CIRCUIT 2 - REHEAT - ALL-ALUMINUM COIL - 581092-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 210 CHARGING CURVE CIRCUIT 3 - REHEAT - ALL-ALUMINUM COIL - 581092-01 Outdoor Temperature (°F) 115° 105°...
  • Page 37 210 CHARGING CURVE CIRCUIT 4 - REHEAT - ALL-ALUMINUM COIL - 581092-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 37 508288-01 9/2022...
  • Page 38 TABLE 10 240 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581093-01 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 39 240 CHARGING CURVE CIRCUIT 2 - NO REHEAT - ALL-ALUMINUM COIL - 581094-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 240 CHARGING CURVE CIRCUIT 3 - NO REHEAT - ALL-ALUMINUM COIL - 581094-01 Outdoor Temperature (°F) 115°...
  • Page 40 240 CHARGING CURVE CIRCUIT 4 - NO REHEAT - ALL-ALUMINUM COIL - 581094-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 40 LGT/LCT156, 180, 210, 240, 300...
  • Page 41 TABLE 11 240 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581095-01 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 42 240 CHARGING CURVE CIRCUIT 2 - REHEAT - ALL-ALUMINUM COIL - 581096-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 240 CHARGING CURVE CIRCUIT 3 - REHEAT - ALL-ALUMINUM COIL - 581096-01 Outdoor Temperature (°F) 115° 105°...
  • Page 43 240 CHARGING CURVE CIRCUIT 4 - REHEAT - ALL-ALUMINUM COIL - 581096-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 43 508288-01 9/2022...
  • Page 44 TABLE 12 300 NORMAL OPERATING PRESSURES - NO REHEAT - ALL-ALUMINUM COIL - 581097-01 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 45 300 CHARGING CURVE CIRCUIT 2 - NO REHEAT - ALL-ALUMINUM COIL - 581098-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 300 CHARGING CURVE CIRCUIT 3 - NO REHEAT - ALL-ALUMINUM COIL - 581098-01 Outdoor Temperature (°F) 115°...
  • Page 46 300 CHARGING CURVE CIRCUIT 4 - NO REHEAT - ALL-ALUMINUM COIL - 581098-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 46 LGT/LCT156, 180, 210, 240, 300...
  • Page 47 TABLE 13 300 NORMAL OPERATING PRESSURES - REHEAT - ALL-ALUMINUM COIL - 581099-01 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 48 300 CHARGING CURVE CIRCUIT 2 - REHEAT - ALL-ALUMINUM COIL - 581100-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) 300 CHARGING CURVE CIRCUIT 3 - REHEAT - ALL-ALUMINUM COIL - 581100-01 Outdoor Temperature (°F) 115° 105°...
  • Page 49 300 CHARGING CURVE CIRCUIT 4 - REHEAT - ALL-ALUMINUM COIL - 581100-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 49 508288-01 9/2022...
  • Page 50 F-Compressor Controls Condenser fan 3 and 4 are energized when See unit wiring diagram to determine which controls are compressor 1 is the ONLY compressor energized. As used on each unit. cooling demand increases, all four condenser fans 1- High Pressure Switch (S4, S7, S28, S96) are energized.

  • Page 51: Temperature Thermistor Sensors

    240 & 300 Prognostic Sensors Condenser fans 1, 2, and 3 are energized when Temperature thermistor sensors (RT46-53) are located compressor 1 or 2 are energized. As cooling demand on specific points for each refrigeration circuit. increases, all six condenser fans are energized. See Temperature thermistors provide...
  • Page 52 LGT/LCT56 EVAPORATOR / INDOOR COIL (RT46, 47) 22J06 22J06 BLUE YELLOW RT47 RT46 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 25 Page 52 LGT/LCT156, 180, 210, 240, 300...
  • Page 53 LGT/LCT156 CONDENSER / OUTDOOR COIL (RT48, 49) 23V50 BLUE RT49 23V50 YELLOW RT48 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 26 Page 53 508288-01 9/2022...
  • Page 54 LGT/LCT180 EVAPORATOR / INDOOR COIL RT46, 47, 50 22J06 RT50 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE 22J06 YELLOW RT46 22J06 BLUE RT47 FIGURE 27 Page 54 LGT/LCT156, 180, 210, 240, 300...
  • Page 55 LGT/LCT180 CONDENSER / OUTDOOR COIL RT48, 49, 52 23V50 YELLOW RT48 23V50 23V50 RT52 BLUE RT49 DETAILS NOT TO SCALE FIGURE 28 Page 55 508288-01 9/2022...
  • Page 56 LGT/LCT210, 240, 300 EVAPORATOR / INDOOR COIL RT46, 47, 50, 51 22J06 GREEN RT51 22J06 RT50 22J06 BLUE CLAMP THERMISTOR RT47 TO BARE COPPER. DETAILS NOT TO SCALE 22J06 YELLOW RT46 FIGURE 29 Page 56 LGT/LCT156, 180, 210, 240, 300...
  • Page 57 LGT/LCT/LHT/LDT210, 240, 300 CONDENSER / OUTDOOR COIL RT48, 49, 52, 53 23V50 23V50 GREEN BLUE RT53 RT49 23V50 23V50 YELLOW RT52 RT48 DETAILS NOT TO SCALE FIGURE 30 Page 57 508288-01 9/2022...

  • Page 58: Gas Heat Start-Up

    Gas Heat Start-Up (Gas Units) 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.

  • Page 59: Heating Operation And Adjustments

    11- The ignition sequence will start. 5- If flame is not detected after first ignition trial, ignition control will repeat steps 3 and 4 two more times 12- If the appliance does not light the first time (gas line before locking out the gas valve. not fully purged), it will attempt up to two more 6- For troubleshooting purposes, an ignition attempt ignitions before locking out.

  • Page 60: Multi-Staged Air Volume Start-Up

    TABLE 17 Multi-Staged Air Volume Start-Up Blower CFM Design Specifications A-Design Specifications T'Stat or Design Unit Blower Speed Zone Con­ Specified Use table 17 to fill in field-provided, design specified trol Stages blower CFM for appropriate unit. Htg. If only high and low cooling design specifications are Clg.
  • Page 61 Unit Heating CFM Vent CFM Smoke CFM De­ De­ De­ Tons Model Speed Heat Code fault fault fault LGT156H Low 5200 2725 6250 5200 1950 5200 1950 6250 4325 4500 LGT156H All N, E, J, K, L 5200 LGT180H Low...

  • Page 62: Multi-Staged Air Volume & Vav Operation

    Multi-Staged Air Volume Operation Page 62 LGT/LCT156, 180, 210, 240, 300...
  • Page 63 Multi-Staged Air Volume Operation Page 63 508288-01 9/2022...
  • Page 64 Multi-Staged Air Volume Operation Page 64 LGT/LCT156, 180, 210, 240, 300...
  • Page 65 Multi-Staged Air Volume Operation Page 65 508288-01 9/2022...
  • Page 66 Multi-Staged Air Volume Operation Page 66 LGT/LCT156, 180, 210, 240, 300...
  • Page 67 Multi-Staged Air Volume Operation Page 67 508288-01 9/2022...
  • Page 68 Multi-Staged Air Volume Operation Page 68 LGT/LCT156, 180, 210, 240, 300...
  • Page 69 Multi-Staged Air Volume Operation Page 69 508288-01 9/2022...
  • Page 70 Multi-Staged Air Volume Operation Page 70 LGT/LCT156, 180, 210, 240, 300...
  • Page 71 Multi-Staged Air Volume Operation Page 71 508288-01 9/2022...
  • Page 72 Multi-Staged Air Volume Operation Page 72 LGT/LCT156, 180, 210, 240, 300...

  • Page 73: Hot Gas Reheat Start-Up

    TABLE 20 Hot Gas Reheat Start-Up Relative Humidity (%RH + 3%) Sensor Output (VDC) General 2.00 Hot gas reheat units provide a dehumidifying mode of 3.00 operation. These units contain a reheat coil adjacent to 4.00 and downstream of the evaporator coil. Reheat coil solenoid valves, L14 and L30, route hot discharge gas 5.00 from the compressor to the reheat coil.
  • Page 74 REHEAT MODE REFRIGERANT ROUTING 156 UNITS Note: Two refrigerant circuits are shown; both circuits operate during reheat. EVAPORATOR CIRCUITS 1 & 2 EXPANSION VALVES CIRCUIT 1 CONDENSER COILS REHEAT COIL CIRCUIT 2 CONDENSER COIL CHECK VALVE REHEAT VALVE REHEAT CHECK VALVE VALVE FIGURE 33...
  • Page 75 REHEAT MODE REFRIGERANT ROUTING 180 UNITS Note: Two refrigerant circuits are shown; both circuits operate during reheat. EVAPORATOR CIRCUITS 1 & 2 EXPANSION ARE INTERTWINED VALVES CIRCUIT 2 & 3 CONDENSER COILS REHEAT COIL CIRCUIT 1 CONDENSER COIL CHECK VALVE REHEAT VALVE REHEAT...
  • Page 76 REHEAT MODE REFRIGERANT ROUTING 210, 240 AND 300 UNITS Note: Two refrigerant circuits are shown; both circuits operate during reheat. ALL FOUR CONDENSER COIL EVAPORATOR EXPANSION CIRCUIT 3 & 4 CONDENSER COIL COILS ARE VALVES CIRCUIT 1 & 2 INTERTWINED REHEAT COIL CHECK...

  • Page 77: 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 78 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 79 F-Evaporator Coil HEAT EXCHANGER ASSEMBLY Inspect and clean coil at beginning of each cooling season. HEAT Clean using mild detergent or commercial coil cleaner. EXCHANGER Flush coil and condensate drain with water taking care not TUBE to get insulation, filters and return air ducts wet. COMBUSTION G-Supply Air Blower Wheel AIR INDUCER...
  • Page 80 INSTALL IONIZER - 156-300 20 TON SHOWN (5 IONIZERS) REMOVE THE SCREW SECURING THE TOP OF THE UPPER FILTER RACK BRACKET ONE EDGE PROTECTOR ON IONIZER BRACKET EVAPORATOR REMOVE THE COIL SCREW SECURING THE BOTTOM OF TWO EDGE THE UPPER FILTER PROTECTORS ON RACK BRACKET FILTER RACK...
  • Page 81 K-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.

  • Page 82: 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 assembly with the mounting holes on the blower Use the mobile service app to adjust parameters; menu deck. Use the retained #10 screws to attach the UVC paths are shown in each table.
  • Page 83 TABLE 25 - 581025-01 LGT/LCT 156, 180, 210, 240, 300 Staged Factory Setting Para Field Description meter Setting Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 5200 6000 7000...
  • Page 84 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 47 Page 84 LGT/LCT156, 180, 210, 240, 300...
  • Page 85 Phase / Voltage Detection * [5] 3 = UV Lamp and Bipolar N = Not Installed Ionizer Installed 1 = Enabled Internal (Lennox) 4 = Wireless IAQ Filter Sensors 2 = External (A42) Phase Detection 5 = UV Lamp and Wireless...
  • Page 86 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...

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