Lennox LGM036 Installation Instructions Manual
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Lennox LGM036 Installation Instructions Manual

Lennox LGM036 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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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/LCM036,
048, 060, 074
3, 4, 5 and 6 Ton
GAS AND COOLING PACKAGED UNITS
508108-01
1/2021
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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Summary of Contents for Lennox LGM036

  • Page 1: Table Of Contents

    ©2021 INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, ser­ vice or maintenance can cause property damage, LGM/LCM036, personal injury or loss of life. Installation and ser­ vice must be performed by a licensed professional 048, 060, 074 HVAC installer or equivalent, service agency, or the gas supplier 3, 4, 5 and 6 Ton Table Of Contents...

  • Page 2: Dimensions

    LGM/LCM036, 048, 060, 074 DIMENSIONS in. - Gas heat section shown 5−5/8 16−1/4 (143) (279) (413) (457) 5 (127) BOTTOM 7 (178) RETURN OPENING BOTTOM (508) SUPPLY (737) 47 (1194) OPENING BASE CENTER 25−3/4 (654) GRAVITY 9−1/2 6−5/8 (241) (168) 26−1/2 (673) BOTTOM...

  • Page 3: Parts Arrangements

    LGM036, 048, 060, & 074 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: 1- Assembled unit Roof Damage! 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 3- Duct must be attached to the roof mounting frame is not recommended during any phase of construction. and not to the unit; supply and return plenums must Very low return air temperatures, harmful vapors and be installed before setting the unit.

  • Page 6: Rigging Unit For Lifting

    Rigging Unit For Lifting UNIT SUPPLY AND RETURN AIR OPENINGS HORIZONTAL Rig unit for lifting by attaching four cables to holes in unit SUPPLY AIR HORIZONTAL base rail. See figure 2. OPENING RETURN AIR OPENING 1- Detach wooden base protection before rigging. 2- Remove all six base protection brackets before setting unit.
  • Page 7 Two hinge screws must be removed in addition to the CONDENSATE SIDE DRAIN CONNECTION mullion screws. See figure 8. CAULK AROUND CONDENSATE COUPLING UNITS WITH HINGED PANELS NOTE - Allow clearance to open doors when installing CONDENSATE UNIT DRAIN MULLION condensate piping.

  • Page 8: Gas Piping

    When making piping connections a drip leg should be BOTTOM CONDENSATE DRAIN installed on vertical pipe runs to serve as a trap for CAUTION: Be careful not to sediment or condensate. A 1/8” N.P.T. plugged tap is damage the coupling threads located on gas valve for test gauge connection.

  • Page 9: Pressure Test Gas Piping

    NOTE-In case emergency shut down is required, turn off BOTTOM ENTRY GAS PIPING COMPLETED the main manual shut-off valve and disconnect main power to unit. These devices should be properly labeled TO GAS GROUND VALVE by the installer. JOINT UNION PRESSURE TEST GAS LINE STREET ELBOW...

  • Page 10: Download Mobile Service App

    Download Mobile Service App Electrical Connections - Power Supply A-Mobile Device Requirements Do not apply power or close disconnect switch until S Android hardware requires 2GB RAM and a 2Ghz installation is complete. Refer to start-up directions. core processor. Tablets are supported. Refer closely to unit wiring diagram.
  • Page 11 B-Control Wiring IMPORTANT-Terminal connections at the wall plate or subbase must be made securely. Loose control wire The Unit Controller will operate the unit from a connections may allow unit to operate but not with proper thermostat or zone sensor based on the System Mode. response to room demand.
  • Page 12 Lennox cat #18M13 (20VA minimum) to supply power instructions provided with sensor. A DDC input may to RH sensor as shown in figure 18. Use two shielded be used to initiate dehumidification instead of a cables containing 20AWG minimum, twisted pair sensor.

  • Page 13: Blower Operation And Adjustments

    B-Determining Unit CFM Blower Operation and Adjustments 1- The following measurements must be made with air Units are equipped with variable speed, direct drive filters in place. blowers. installer able enter 2- With all access panels in place, measure static design-specified supply air CFM into the Unit Controller pressure external to unit (from supply to return).
  • Page 14 C-Adjusting Unit CFM Blower calibration is required only on units that are newly installed or if there is a change in the duct work or air filters The supply CFM can be adjusted by changing Unit after installation. Use the mobile service app to navigate Controller settings.
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  • Page 19 B LO WER DATA FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g. Wet Indoor Coil Filters Condenser Electric Volume Economizer Reheat Coil Heat 036, 048 060, 074 MERV 8 MERV 13 MERV 16 0.01 - - - - - - 0.01 0.04 0.04...

  • Page 20: Cooling Start-Up

    5- If discharge pressure is high, remove refrigerant from Cooling Start-Up the system. If discharge pressure is low, add A-Operation refrigerant to the system. 1- Initiate full load cooling operation using the following S Add or remove charge in increments. mobile service app menu path: S Allow the system to stabilize each time SERVICE >...
  • Page 21 TABLE 6 581010-01 C-Compressor Controls LG/LC 048U NORMAL OPERATING PRESSURES Outdoor Coil Discharge Suction + 5 See unit wiring diagram to determine which controls are Entering Air Temp +10 psig psig used on each unit. Optional controls are identified on 655 F wiring diagrams by arrows at junction points.

  • Page 22: Prognostic & Diagnostic Sensors

    alarms such as loss of condenser or evaporator airflow Prognostic & Diagnostic Sensors and loss of charge. Units are equipped with four factory-installed thermistors Each thermistor must be specifically placed for proper (RT42, RT44, RT46, and RT48) located on different unit operation and to initiate valid alarms.
  • Page 23 THERMISTOR LOCATION RT42 & 46 060U & 074 FOUR-ROW EVAPORATOR COIL (VIEW FROM FRONT SIDE OF UNIT) RT46 CLAMP THERMISTOR TO BARE COPPER; NOT THE DISTRIBUTOR SLEEVE DISTRIBUTOR TUBE DETAILS NOT TO SCALE TXV BULB RT42 SUCTION LINE FIGURE 22 Page 23 LGM/LCM036, 048, 060, 074...
  • Page 24 THERMISTOR LOCATION RT44 & RT48 036-048 CONDENSER COIL (VIEW FROM FRONT SIDE OF UNIT) RT48 RT44 LIQUID LINE EXIT FIGURE 23 Page 24 LGM/LCM036, 048, 060, 074...

  • Page 25: Cooling Operation

    C-Zone Sensor Cooling Operation 1-Economizer With Outdoor Air Suitable A-Two-Stage Thermostat Low Cooling Demand - 1-Economizer With Outdoor Air Suitable Compressor Off Y1 Demand - Blower Variable Compressor Off Dampers Modulate Blower Low High Cooling Demand - Dampers Modulate Compressor Variable Blower Variable Y2 Demand - Dampers Full Open...

  • Page 26: 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, FOR YOUR SAFETY READ BEFORE LIGHTING move thermostat switch to OFF and return the thermostat switch to HEAT to reset ignition control.

  • Page 27: Heating Operation And Adjustments

    12- If the furnace does not light the first time (gas line not B-Ignition Control Diagnostic LEDs fully purged), it will attempt up to two more ignitions TABLE 11 IGNITION CONTROL HEARTBEAT LED STATUS before locking out. 13- If lockout occurs, repeat steps 1 through 10. Indicates Flashes 14- If the appliance will not operate, follow the...

  • Page 28: Hot Gas Reheat Startup

    Default Reheat Operation Hot Gas Reheat Start-Up And Operation During reheat mode free cooling is locked out. General A-Thermostat Mode With 24V Humidistat Hot gas reheat units provide a dehumidifying mode of No Y1 demand but a call for dehumidification: operation.
  • Page 29 REHEAT MODE REFRIGERANT ROUTING RETURN OUTDOOR EVAPORATOR EXPANSION COIL VALVE REHEAT COIL SUPPLY COMPRESSOR CONDENSER COIL CHECK VALVE REHEAT VALVE FIGURE 25 COOLING MODE REFRIGERANT ROUTING RETURN OUTDOOR EVAPORATOR EXPANSION COIL VALVE REHEAT COIL SUPPLY COMPRESSOR CONDENSER COIL CHECK VALVE REHEAT VALVE FIGURE 26...

  • Page 30: 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, turn the PULL TO electrical power unit REMOVE disconnect switch(es).
  • Page 31 IGNITOR BURNER BOX ASSEMBLY Single- and Two-Stage SPARK GAP SHOULD BE 1/8” (3mm) REMOVE INDIVIDUAL BURNERS ON OLDER UNITS; REMOVE THE ENTIRE BURNER ASSEMBLY ON NEWER UNITS. FLAME SENSOR FIGURE 30 BURNER ORIENTATION One- and Two-Stage Heat 150,000 BTUH - 7 BURNERS BURNERS SENSOR IGNITOR...
  • Page 32 4- Remove and retain screws securing combustion E-Flue Box (Gas Units) air inducer to flue box. Remove vent connector. Remove flue box cover only when necessary for See figure 32. equipment repair. Clean inside of flue box cover and heat 5- Clean inducer wheel blades with a small brush and exchanger tubes with a wire brush when flue box cover wipe off any dust from housing.
  • Page 33 J-Needlepoint Bipolar Ionizer (Optional) REMOVE IONIZER The optional, brush-type ionizer produces positive and RETAIN THE SCREW TO SECURE THE 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 34 K-UVC Light (Optional) 5- Remove the (2) mounting screws of the UVC assembly. Carefully slide the complete UVC Factory-Installed UVC Light assembly out through the blower access door. When the UVC light is factory installed, the lamp is 6- Allow 10 minutes before touching the lamps. Then, shipped attached to the filter rack.
  • Page 35 Lamp Disposal Hg-LAMP Contains Mercury.—Manage in accordance with local, state and federal disposal laws. Refer to www.lamprecycle.org or call 800-953-6669. Proper Clean-up Technique in Case of Lamp Breakage ATTACH LIGHT ASSEMBLY Wear protective gloves, eye wear and mask. Sweep the broken glass and debris into a plastic bag, seal UVC LIGHT the bag, and dispose of properly.

  • Page 36: Factory Unit Controller Settings

    TABLE 13 Factory Unit Controller Settings 581024 Units With Hot Gas Reheat Use the mobile service app to adjust parameters; menu RTU Menu > Settings “RTU Options” > Dehumidifier paths are shown in each table. Refer to the Unit Controller Para­...
  • Page 37 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 39 Page 37 LGM/LCM036, 048, 060, 074...
  • Page 38 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 39 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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