Lennox LGM092U Installation Instructions Manual
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Lennox LGM092U Installation Instructions Manual

Lennox LGM092U Installation Instructions Manual

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©2021
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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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
LGM092U, LCM092U
LGM102U, LCM102U
LGM120U, LCM120U
LGM150U, LCM150U
PACKAGED UNITS
508116-01
1/2021
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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.
(7.5 Ton)
(8.5 Ton)
(10 Ton)
(12.5 Ton)
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Summary of Contents for Lennox LGM092U

  • Page 1: Table Of Contents

    ©2021 INSTALLATION INSTRUCTIONS WARNING Improper installation, adjustment, alteration, ser­ LGM092U, LCM092U vice or maintenance can cause property damage, (7.5 Ton) personal injury or loss of life. Installation and ser­ LGM102U, LCM102U vice must be performed by a licensed professional (8.5 Ton)

  • Page 2: Dimensions

    LGM/LCM092, 102, 120, & 150 DIMENSIONS - GAS HEAT SECTION SHOWN 6-1/8 5-5/8 BOTTOM SUPPLY (156) (143) AIR OPENING 6-1/8 10-3/4 (156) (610) (711) (273) (508) (686) CENTER OF 60-1/8 (1527) GRAVITY BASE BOTTOM RETURN BOTTOM AIR OPENING POWER ENTRY 5-1/2 (140) Dia.

  • Page 3: Parts Arrangements

    LGM092, 102, 120, 150 PARTS ARRANGEMENT BLOWER CONDENSER REHEAT COIL EVAPORATOR (DIRECT DRIVE) (OPTIONAL) FANS COIL FILTERS (FOUR - 20 X 25 X 2”) CONDENSER COIL COMPRESSOR INVERTER (BEHIND THE HINGED PANEL) ECONOMIZER (OPTIONAL) WIFI ANTENNA UNIT IGNITION CONTROLLER CONTROL COMBUSTION WIRELESS AIR INDUCER...

  • Page 4: Shipping And Packing List

    Shipping and Packing List UNIT CLEARANCES Package 1 of 1 contains: 1- Assembled unit Optional Outdoor Check unit for shipping damage. Receiving party should Air Hood 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.

  • 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 C1CURB7*B Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will 1- The C1CURB7*B roof mounting frame must be damage the unit.

  • Page 6: Duct Connection

    B-Horizontal Discharge Applications A trap must be installed between drain connection and an open vent for proper condensate removal. See figure 3 or 1- Units installed in horizontal airflow applications must 4. It is sometimes acceptable to drain condensate onto use a horizontal conversion kit K1HECK00.
  • Page 7 2- Remove six screws from filter access door. Refer to CONDENSATE BOTTOM DRAIN CONNECTION figure 6. UNITS WITH HINGED PANELS UNIT FILTER DOOR CONDENSATE DRAIN PAN DRAIN MULLION CAULK AROUND CONDENSATE COUPLING REMOVE OPEN VENT THREE SCREWS (PER HINGE) MOUNTING FIGURE 6 FRAME 3- Open filter access door hinges and carefully remove...

  • Page 8: Gas Piping

    Bottom Drain Connection Connect Gas Piping (Gas Units) 1- Open blower and heat access doors. See figure 5. 2- Remove six screws from filter access door. Refer to Before connecting piping, check with gas company or figure 6. authorities having jurisdiction local code...

  • Page 9: Pressure Test Gas Piping

    Pressure Test Gas Piping (Gas Units) BOTTOM ENTRY GAS PIPING THROUGH THE CURB When pressure testing gas lines, the gas valve must MULLION BETWEEN be disconnected and isolated. Gas valves can be HEAT AND COMPRES­ damaged if subjected to more than 0.5 psig (3.48kPa). SOR SECTIONS See figure 12.

  • Page 10: High Altitude Derate

    3- Connect separate 120v wiring to optional GFCI High Altitude Derate outlet. Route field wiring in conduit between bottom Locate the high altitude conversion sticker in the unit power entry and GFCI. See figure 14. literature bag. Fill out the conversion sticker and affix next MOBILE SERVICE APP MENU OVERVIEW to the unit nameplate.
  • Page 11 3- Connect thermostat wiring to Unit Controller on the Electrical Connections - Control Wiring lower side of the controls hat section. NOTE ‐ Optional wireless sensors are available for use 4- Wire as shown in figure 15 for electro-mechanical with this unit. Refer to the instructions provided with each electronic thermostats.
  • Page 12 Wire runs over 150 feet (mm): FIELD WIRING IN ZONE SENSOR MODE Use a local, isolated 24VAC transformer such as Lennox (Zone Sensor Mode) cat #18M13 (20VA minimum) to supply power to RH sensor as shown in figure 19. Use two shielded cables...

  • Page 13: Blower Operation And Adjustments

    Initiate blower only (G) demand at thermostat according Blower Operation to instructions provided with thermostat. Unit will cycle on Units are equipped with variable speed, direct drive thermostat demand. The following steps apply to blowers. installer able enter applications using typical electro-mechanical design-specified supply air CFM into the Unit Controller...
  • 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 SUPPLY SUPPLY LOCATION TURN TURN FIRST BRANCH OFF OF MAIN RUN MAIN DUCT RUN SUPPLY AIR SUPPLY AIR READING READING...

  • Page 15: Direct Drive Start-Up

    Blower calibration is required only on units that are newly Direct Drive Blower Start-Up installed or if there is a change in the duct work or air filters after installation. Use the mobile service app to navigate The supply CFM can be adjusted by changing Unit to the SETUP>TEST &...
  • Page 16 BLOWER DATA BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY (NO HEAT SECTION) WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 − Wet indoor coil air resistance of selected unit. 2 − Any factory installed options air resistance (heat section, Economizer, etc.) 3 −...
  • Page 17 BLO WER DATA POWER EXHAUST FAN PERFORMANCE Return Air System Static Pressure Air Volume Exhausted in. w.g. 3175 0.05 2955 0.10 2685 0.15 2410 0.20 2165 0.25 1920 0.30 1420 0.35 1200 FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g. Gas Heat Exchanger Filters Return...

  • Page 18: Cooling Start-Up

    Cooling Start-Up REFRIGERANT STAGES TRADITIONAL FIN/TUBE COIL IMPORTANT-The crankcase heater must be energized for 24 hours before attempting to start compressor. Set thermostat so there is no demand to prevent CONDENSER COIL (BOTH FANS ARE ENERGIZED STAGES 1 & 2 compressors from cycling.
  • Page 19 TABLE 4 581027-01 TABLE 8 581031-01 LGM/LCM092U No Reheat LGM/LCM120U No Reheat CIRCUIT 1 CIRCUIT 2 Circuit 1 Circuit 2 Outdoor Outdoor Dis­ Dis­ Dis­ Dis­ Coil Coil Suction Suction Suction Suction charge charge Entering Entering charge charge +5 psig +5 psig +10 psig +5 psig...

  • Page 20: Prognostic & Diagnostic Sensors

    Charge Verification - Subcooling Method - AHRI 2- Low Pressure Switch (S87, S88) Testing The compressor circuit is protected by a loss of charge switch. Switch opens at 40 psig + 5 psig (276 Attach gauge manifolds to discharge and suction lines. + 34 kPa) and automatically resets at 90 psig + 5 With the economizer disabled, operate the unit in psig (621 kPa + 34 kPa).
  • Page 21 THERMISTOR LOCATION RT42, 43, 46, 47 (EVAPORATOR COIL VIEW FROM FRONT SIDE OF UNIT) RT42 RT47 RT46 BULB RT42/43 SUCTION LINE RT43 FIGURE 23 Page 21...
  • Page 22 THERMISTOR LOCATION RT44 & 45 (VIEW FROM FRONT SIDE OF UNIT) 092, 102 CONDENSER COIL 120, 150 CONDENSER COIL RT44 & 45 RT44 RT45 RT45 RT44 FIGURE 24 Page 22...
  • Page 23 THERMISTOR LOCATION RT48 & 49 (VIEW FROM FRONT SIDE OF UNIT) 092, 102 CONDENSER COIL 120, 150 CONDENSER COIL RT48 RT49 FIGURE 25 Page 23...

  • Page 24: Gas Heat Start-Up

    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 25: Heating Operation And Adjustments

    5- Turn gas valve switch to OFF. See figure 26. On 3- Spark ignitor energizes and gas valve solenoid Honeywell VR8305Q gas valves, turn the knob on the opens. gas valve clockwise to “OFF”. Do not force. See 4- Spark ignites gas, ignition sensor proves the flame figure 27.

  • Page 26: Cooling Operation

    B-Three-Stage Thermostat Cooling Operation 1-Economizer With Outdoor Air Suitable This is a summary of cooling operation. Refer to the sequence of operation provided in the Engineering Y1 Demand - Handbook or Service Manual for more detail. Compressors Off Blower Cooling Low Note - Free cooling is locked-out during reheat operation.

  • Page 27: Modulating Hot Gas Reheat

    The reheat setpoint can be adjusted by changing mobile Modulating Hot Gas Reheat Start-Up And service app Settings - Control menu. A setting of 100% Operation will operate reheat from an energy management system General digital output. Hot gas reheat units provide a dehumidifying mode of The reheat setpoint can also be adjusted using an operation.
  • Page 28 COOLING MODE REFRIGERANT ROUTING FIGURE 29 Default Reheat Operation TABLE 14 Reheat Operation - Two Cooling Stages - Default T'stat and Humid­ Operation ity Demands Reheat Only Compressor 1 Reheat Compressor 1 & 2 Enhanced De­ Reheat & Y1 humidification at Low CFM Compressor 1 &...

  • Page 29: Service

    3- Remove screws securing burner assembly to burner Service support and remove assembly. See figure 31. Clean The unit should be inspected once a year by a qualified as necessary. service technician. 4- Locate the ignitor under the left burners. Check ignitor spark gap with appropriately sized twist drills CAUTION or feeler gauges.
  • Page 30 IGNITOR AND SENSOR POSITION IGNITOR SENSOR TOP VIEW SIDE VIEW IGNITOR SIDE VIEW SENSOR Gas Flow Gas Flow 1-3/4” 1-3/8” (45mm) (35mm) 3/8” 13/16” BURNER BOX (10mm) (21mm) FIGURE 33 TABLE 15 3- Remove and retain screws securing combustion air inducer to flue box.
  • Page 31 E-Flue Passageway and Flue Box (Gas Units) J-Condenser Coil Clean condenser coil annually with detergent or 1- Remove combustion air inducer assembly as commercial coil cleaner and inspect monthly during the described in section D. cooling season. Access panels are provided on front and back of condenser section.
  • Page 32 L-UVC Light 2- Check Lamp: Carefully remove the UVC assembly out of the rooftop unit. Use multimeter to test for Factory-Installed UVC Light continuity across each pair of pins at each end of the When the UVC light is factory installed, the lamp is lamp.
  • Page 33 UVC ASSEMBLY UVC LAMP UVC ASSEMBLY ASSEMBLY SECURED DOOR WITH 3 SCREWS SWITCH FIGURE 38 Page 33...
  • Page 34 TURN POWER ON; LAMP LEDS NOT LIT CONNECTORS FOR ALL THE CHECK LAMP LEDS LAMPS ARE PROPERLY ENGAGED LAMP LEDS LIT? CALL LENNOX TWO PAIR, PIN TO PIN TECH SUPPORT ON EACH PAIR 1-800-453-6669 (SEE DETAIL A) LAMPS BANDS CONTINUITY...

  • Page 35: Field-Installed Accessories

    TABLE 18 Field-Installed Accessories 580683 When field-installing the following accessories, refer to LGM/LCM 092U4E (2-Compressor) Staged Direct Drive the latest online installation instruction. Field Para­ Factory Setting mete Setting Description TABLE 16 Note: Any changes to Smoke CFM setting must be adjusted be­ Accessory Instruction # fore the other CFM settings.
  • Page 36 TABLE 19 TABLE 20 581053-01 580684 LGM/LCM102U4E (2-Compressor) Staged Direct Drive LGM/LCM 120U4E (2-Compressor) Staged Direct Drive Field Para­ Field Para­ Factory Factory Setting meter Setting mete Setting Description Setting Description Note: Any changes to Smoke CFM setting must be adjusted be­ Note: Any changes to Smoke CFM setting must be adjusted fore the other CFM settings.
  • Page 37 TABLE 21 TABLE 22 580685 581024-01 Units With Hot Gas Reheat LGM/LCM 150U4E (2-Compressor) Staged Direct Drive RTU Menu > Settings “RTU Options” > Dehumidifier Field Para­ Factory meter Setting Description Setting Para­ Factory Field meter Setting Setting Note: Any changes to Smoke CFM setting must be adjusted Description before the other CFM settings.
  • Page 38 Dual-Stage = D U = Unconfigured 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 41 Page 38...
  • Page 39 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 40 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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