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Lennox LGM156U Installation Instructions Manual

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E2021
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.

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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
LGM/LCM156U
LGM/LCM180U
LGM/LCM210U
LGM/LCM240U
LGM/LCM300U
ROOFTOP PACKAGED UNITS
508117-01
2/2021
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(13 Ton)
(15 Ton)
(17.5 Ton)
(20 Ton)
(25 Ton)
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Summary of Contents for Lennox LGM156U

  • Page 1: Table Of Contents

    E2021 INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, ser­ vice or maintenance can cause property damage, LGM/LCM156U (13 Ton) personal injury or loss of life. Installation and ser­ vice must be performed by a licensed professional LGM/LCM180U HVAC installer or equivalent, service agency, or the (15 Ton) gas supplier LGM/LCM210U...

  • Page 2: Dimensions

    LGM/LCM156U, 180U Unit Dimensions - Inches (mm) - Gas Heat Section Shown 133−1/8 (3394) 4−1/4 (108) 12−3/8 60−1/2 (1537) (314) BOTTOM RETURN 15 (381) 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 3 LGM/LCM 210U, 240U & 300U 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 4: Parts Arrangements

    LGM156U, 180U, 210U, 240U, 300U PARTS ARRANGEMENT 210U, 240U, 300U Shown REHEAT EVAPORATOR COIL FILTERS COIL (SIX - 24 X 24 X 2”) CONDENSER FANS (4 ON 156 & 180) BLOWERS ECONOMIZER DAMPERS (OPTIONAL) BLOWER MOTOR BLOWER INVERTER UNIT CONTROLLER...

  • Page 5: Shipping And Packing List

    See figure 1 for unit clearances. The LGM156U gas/electric packaged rooftop unit is UNIT CLEARANCES - 156, 180U UNIT SHOWN available in 260,000 & 360,000 Btuh heating input. The LGM180U, 210U, 240U, & 300U gas/electric Optional...

  • Page 6: Unit Support

    Unit Support NOTICE In downflow discharge installations, install the unit on a Roof Damage! non-combustible surface only. Unit may be installed on This system contains both refrigerant and oil. combustible surfaces when used in horizontal discharge Some rubber roofing material may absorb oil, applications or in downflow discharge applications when causing the rubber to swell.

  • Page 7: Duct Connection

    B-Horizontal Discharge Applications RIGGING 1- Units installed in horizontal airflow applications must *Weight Unit use an LARMFH18/24 horizontal roof mounting Lbs. frame. The supply air duct connects to the horizontal LC 156, 180 2400 1089 supply air opening on the LARMFH18/24. The return LC 210 2550 1157 air duct connects to the unit horizontal return air...

  • Page 8: Gas Piping

    CONDENSATE DRAIN CONNECTION OUTSIDE OF UNIT GAS PIPING 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 9: High Altitude Derate

    NOTE-Codes may require that manual main shut-off TABLE 1 HIGH ALTITUDE DERATE valve and union (furnished by installer) be installed in gas line external to unit. Union must be of the ground joint Altitude Ft.* Gas Manifold Pressure type. 2000-4500 See Unit Nameplate After all connections have been made, check all piping 4500 And Above...

  • 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 Wire runs over 150 feet (mm): The Unit Controller will operate heating and cooling Use a local, isolated 24VAC transformer such as Lennox based on the Unit Controller internal setpoints and the cat #18M13 (20VA minimum) to supply power to RH temperature from the A2 zone sensor.

  • Page 12: Blower Operation And Adjustments

    Blower Operation and Adjustments FIELD WIRING REHEAT UNITS (Using A Humidity Sensor With Less Than 150 Ft. Wire Runs) Supply Air Staged Units - The blower rotation will A55 UNIT always be correct on units equipped with an inverter. CONTROLLER CONNECTED Checking blower rotation is not a valid method of P298...
  • Page 13 Variable Air Volume Units - Refer to the Variable Air WARNING Volume Start-Up section. 1-Make sure that unit is installed in accordance with the 1- The following measurements must be made with a installation instructions and applicable codes. dry indoor coil. Run blower (G demand) without a 2-Inspect all electrical wiring, both field‐...
  • Page 14 BLOWER ASSEMBLY - NO TENSIONER TO INCREASE CFM LOOSEN ALLEN SCREW & TO INCREASE BELT TENSION TURN PULLEY CLOCKWISE 1-Loosen four screws securing blower motor to TO DECREASE CFM sliding base. TURN PULLEY 2-Turn adjusting screw to the left, or counter­ COUNTERCLOCKWISE clockwise, to move the motor downward and tighten the belt.
  • Page 15 PULLEY ALIGNMENT - WITH TENSIONER FIXED PULLEY ADJUSTABLE PULLEY TENSIONER BOLT AND TENSIONER ADJUSTMENT NUT BOLT ALIGN TENSIONER MARKS FIGURE 18 Blowers Equipped With Belt Tensioner 3- Measure belt deflection force. For a used belt, the deflection force should be 5 lbs. (35kPa) . A new belt 1- Loosen the bolt in the center of the tensioner.
  • Page 16 Page 16...
  • Page 17 BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Efficiency Nominal Maximum Drive Kit Number RPM Range Standard or High 2.30 535 - 725 Standard or High 2.30 710 - 965 Standard 3.45 535 - 725 Standard 3.45 710 - 965 High 3.45 685 - 856...
  • Page 18 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 Std. 1VP40x7/8 79J0301 BK95 x 1-3/16...

  • Page 19: Cooling Start-Up

    2- First-stage thermostat demand will energize indoor Cooling Start-Up blower in Low Cooling CFM. Second-stage IMPORTANT-The crankcase heater must be energized thermostat demand will energize indoor blower in for 24 hours before attempting to start compressor. Set High Cooling CFM. Both demands energize thermostat so there is no demand to prevent compressor 1 (variable speed compressor).
  • Page 20 156, 180 REFRIGERANT CIRCUITS ALL THREE EVAPORATOR COIL CIRCUITS ARE INTERTWINED EVAPORATOR COIL (not to scale) CIRCUIT 1 & 2 CIRCUIT 2 & 3 INTERTWINED CONDENSER COILS CIRUIT 1 INTERTWINED CIRCUIT 3 CONDENSER COIL FIGURE 20 210, 240, 300 REFRIGERANT CIRCUITS ALL FOUR EVAPORATOR COIL CIRCUITS ARE INTERTWINED...
  • Page 21 D-Refrigerant Charge and Check - Fin/Tube Coil TABLE 6 156 Reheat Compressor 1 Frequency 56Hz - 581015-01 WARNING-Do not exceed nameplate charge under any condition. Circuit 1 Circuit 2 Circuit 3 Outdoor This unit is factory charged and should require no further Coil Suct.
  • Page 22 TABLE 10 TABLE 14 210 Reheat Compressor 1 Frequency 48Hz - 581019-01 300 Reheat Compressor 1 Frequency 68Hz - 581023-01 Outdoor Circuit 1 Circuit 2 Circuit 3 Circuit 4 Outdoor Circuit 1 Circuit 2 Circuit 3 Circuit 4 Coil En­ Coil En­...
  • Page 23 F-Compressor Controls 210, 240 & 300 Condenser fans 1, 2, and 3 are energized when See unit wiring diagram to determine which controls are compressor 1 or 3 are energized. As cooling demand used on each unit. increases, all six condenser fans are energized. Condenser fans 1, 2, 5, and 6 are energized after a 1- High Pressure Switch (S4, S7, S28, S96) 2-second delay.

  • Page 24: Temperature Thermistor Sensors

    TABLE 16 Temperature Thermistor Sensors THERMISTOR LOCATION Unit Sensor Figure Each thermistor must be specifically placed for proper unit operation and to initiate valid alarms. See table 16 156, 180 RT42, 43, 46, 47, 50, 54 Figure 24 for proper locations. 210, 240, 300 RT42, 43, 46, 47, 50, 51, 54, 55 Figure 25...
  • Page 25 THERMISTOR LOCATION - 156, 180 CONDENSOR COIL (RT44, RT45, RT48, RT49, RT52, RT56) RT52 BLUE RT49 DETAIL H BLUE RT56 YELLOW RT45 DETAIL G RT44 YELLOW RT48 DETAIL H DETAIL G FIGURE 26 Page 25 508117-01 2/2021...
  • Page 26 THERMISTOR LOCATION - 210 CONDENSOR COIL (RT44, RT45, RT48, RT49, RT52, RT53, RT56, RT57) GREEN RT52 RT53 YELLOW RT48 GREEN YELLOW RT57 RT44 DETAIL K RT56 BLUE RT45 DETAIL L BLUE RT49 DETAIL K DETAIL L FIGURE 27 Page 26 LGM/LCM156, 180, 210, 240, 300...
  • Page 27 THERMISTOR LOCATION - 240, 300 CONDENSOR COIL (RT44, RT45, RT48, RT49, RT52, RT53, RT56, RT57) RT52 GREEN RT53 YELLOW RT48 BLUE RT49 YELLOW RT44 GREEN BLUE RT57 RT45 RT56 DETAIL M DETAIL N DETAIL M DETAIL N FIGURE 28 Page 27 508117-01 2/2021...

  • Page 28: 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 BEFORE LIGHTING smell all around the appliance area manually. Unit has a direct spark for gas. Be sure to smell next to the floor because some ignition system.

  • Page 29: Heating Operation And Adjustments

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

  • Page 30: Variable Air Volume Start-Up

    TABLE 17 Variable Air Volume Start-Up RECORD ADJUSTED SETPOINTS Units contain a supply air blower equipped with a Setpoint Setpoint Display Parameter Description “w.c. Setting variable frequency drive A96 (VFD) which varies supply air CFM. Smoke The supply air VFD (A96) is located in the control area. Ventilation See figure 32.
  • Page 31 B-Unit Operation 12- Restore power to unit. Blower will operate in constant air volume (CAV) mode. Use the mobile app to check unit mechanical operation. See the Service - Test section of the Unit Controller Note - The indoor blower motor will start as soon as the main manual.

  • Page 32: Multi-Staged Air Volume Start-Up

    TABLE 18 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 18 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 33 Set Minimum Position 2 TABLE 19 MINIMUM AND MAXIMUM CFM Use the following mobile service app menu in the Unit Controller to set “Min OCP Blwr Low” for the blower CFM Gas Heat Minimum CFM below the “midpoint” CFM. When navigating into this Unit Gas Heat Size Airflow CFM...

  • Page 34: Multi-Staged Air Volume Operation

    Note - If dampers are at maximum open for three minutes, Multi-Staged Air Volume Operation compressor 1 is energized and blower stays on cooling This is a summary of cooling operation. Refer to the high. sequence of operation provided in the Engineering Y3 Demand - Handbook or Service Manual for more detail.

  • Page 35: Hot Gas Reheat Start-Up And Operation

    TABLE 20 Hot Gas Reheat Start-Up And Operation Relative Humidity (%RH + 3%) Sensor Output (VDC) General 2.00 3.00 Hot gas reheat units provide a dehumidifying mode of 4.00 operation. These units contain a reheat coil adjacent to 5.00 and downstream of the evaporator coil. Reheat coil 6.00 solenoid valves, L14 and L30, route hot discharge gas from the compressor to the reheat coil.
  • Page 36 REHEAT MODE REFRIGERANT ROUTING 156, 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 INTERTWINED REHEAT COIL CIRCUIT 1 CONDENSER COIL CHECK VALVE REHEAT...
  • Page 37 REHEAT MODE REFRIGERANT ROUTING 210, 240 AND 300 UNITS Note: Two refrigerant circuits are shown; both circuits operate during reheat. ALL FOUR CONDENSER COIL CONDENSER COIL EVAPORATOR CIRCUIT 2 & 4 ARE EXPANSION CIRCUIT 1 & 3 ARE COILS ARE INTERTWINED VALVES INTERTWINED...
  • Page 38 TABLE 21 REHEAT OPERATION Thermostat Mode With 24V Humidistat Humidity Demands Operation Compressor 1 reheat on Compressor 1 operates at 100% Reheat valve is energized 24V Demand for Dehumidification only Remaining compressors are off Blower and outdoor fans modulate to maintain indoor coil and discharge air temperatures Compressor 1 &...

  • Page 39: 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 40 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 41 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 42 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 43 K-UVC Light (Optional) 6- Allow 10 minutes before touching the lamps. Then, carefully remove the lamp splash guards (and lamp Factory-Installed UVC Light for annual replacement) from each of the lamp When the UVC light is factory installed, the lamp is holders.

  • Page 44: 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 45 TABLE 26 - 581025-01 LGM/LCM 156U, 180U, 210U, 240U, 300U Staged Factory Setting Para Field Description meter Setting 156U 180U 210U 240U 300U 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 46 Unconfigured = U Power Exhaust Control [4] [5] Network Module Not Installed = N N = Not Installed Damper Position = A L = LonTalk (Lennox) A34 Pressure Sensor = C FIGURE 48 Page 46 LGM/LCM156, 180, 210, 240, 300...
  • Page 47 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 48 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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