Lennox LGH150H Installation Instructions Manual
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Lennox LGH150H Installation Instructions Manual

Lennox LGH150H Installation Instructions Manual

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©2020
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
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Page 14
INSTALLATION
INSTRUCTIONS
LGH092H, LCH092H
LGH094U, LCH094U
LGH102H, LCH102H
LGH120H, LCH120H
LGH122U, LCH122U
LGH150H, LCH150H
LGH152U, LCH152U
PACKAGED UNITS
507245-08
5/2020
Supersedes 4/2020
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(7.5 Ton)
(7.5 Ton)
(8.5 Ton)
(10 Ton)
(10 Ton)
(12.5 Ton
(12.5 Ton
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Page 32
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Page 42
LGH SHOWN

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Summary of Contents for Lennox LGH150H

  • Page 1: Table Of Contents

    CAUTION LGH122U, LCH122U (10 Ton) As with any mechanical equipment, contact with sharp sheet metal edges can result in personal in­ LGH150H, LCH150H (12.5 Ton jury. Take care while handling this equipment and wear gloves and protective clothing. LGH152U, LCH152U (12.5 Ton...

  • Page 2: Dimensions

    LGH/LCH092, 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 LGH/LCH094, 122, & 152 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 BOTTOM RETURN AIR OPENING POWER ENTRY 5-1/2 (140) Diameter 6-5/8 7 (178)

  • Page 4: Parts Arrangements

    LGH092, 094, 102, 120, 122, 150 & 152 PARTS ARRANGEMENT CONDENSER FANS BLOWER MOTOR DISCONNECT / EVAPORATOR (2 FANS ON 092, 102, 120, (BELT DRIVE CIRCUIT BREAKER COIL 150 UNITS; 3 FANS ON SHOWN) (FACTORY OR FIELD 094, 122, 152 UNITS) INSTALLED OPTION) UNIT CONDENSER...

  • Page 5: Shipping And Packing List

    Shipping and Packing List Safety Package 1 of 1 contains: See table 1 for unit clearances. 1- Assembled unit IMPORTANT - Hot gas reheat units require a specific WARNING field-provided and installed humidity sensor. Electric shock hazard and danger of Check unit for shipping damage.

  • 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 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 8 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 9: 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 10: 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 11: High Altitude Derate

    Do not apply power or close disconnect switch until High Altitude Derate installation is complete. Refer to start-up directions. Locate the high altitude conversion sticker in the unit Refer closely to unit wiring diagram. literature bag. Fill out the conversion sticker and affix next Refer to unit nameplate for minimum circuit ampacity to the unit nameplate.
  • Page 12 CONTROL WIRING 3- Connect thermostat wiring to the bottom of the Unit Controller. CAUTION 4- Wire as shown in figure 15 for electro-mechanical electronic thermostats. using other Electrostatic discharge can affect electronic com­ ponents. Take precautions during unit installation temperature control devices or energy management and service to protect the electronic controls.
  • Page 13 USE S86 DEHUMIDISTAT AND K55. FIGURE 15 Wire runs over 150 feet (mm): FIELD WIRING HOT GAS REHEAT UNITS Use a local, isolated 24VAC transformer such as Lennox (Using A Dehumidification Switch) cat #18M13 (20VA minimum) to supply power to RH J299 sensor as shown in figure 18.

  • Page 14: Blower Operation And Adjustments

    Units Equipped With Belt Drive Blowers Controlled FIELD WIRING HOT GAS REHEAT UNITS (Using by an Inverter OR Direct Drive Blowers Equipped A Humidity Sensor With More than 150Ft. Wire Runs) With Optional Voltage or Phase Detection - The Unit Controller checks the incoming power during start-up.
  • Page 15 BELT DRIVE BLOWER ASSEMBLY TO INCREASE BELT TENSION SIDE VIEW 1- Loosen four bolts securing motor mounting base to frame. 2- Turn adjusting bolt to the right, or clockwise, to move the motor away from the blower housing. MOTOR ALLEN SCREW IMPORTANT - Gap between end of frame and motor mounting base should be equal at both ends, i.e.
  • Page 16 DIRECT DRIVE BLOWER ASSEMBLY BLOWER HOUSING BLOWER MOTOR SECURED TO THIS SIDE OF HOUSING REMOVE TWO SCREWS ON EACH SIDE TO SLIDE BLOWER OUT OF UNIT INLET GRID FIGURE 21 C-Determining Unit CFM 3- Referring to pages 19 through 22, use static pressure and RPM readings to determine unit CFM.
  • Page 17 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 18 BLOWER DATA 092, 094 AND 102 BELT DRIVE BLOWER − BASE UNIT 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 −...
  • Page 19 BLOWER DATA 120, 122, 150 AND 152 BELT DRIVE BLOWER − BASE UNIT 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 −...
  • Page 20 BLOWER DATA 094, 122 AND 152 DIRECT DRIVE BLOWER ALL MODELS − BASE UNIT 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 −...
  • Page 21 BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Efficiency Nominal hp Maximum hp Drive Kit Number RPM Range Standard & High 590 - 890 Standard & High 800 - 1105 Standard & High 795 - 1195 Standard 3.45 730 - 970 Standard 3.45 940 - 1200...

  • Page 22: Cooling Start-Up

    TABLE 5 MANUFACTURER'S NUMBERS - NO TENSIONER DRIVE COMPONENTS ADJUSTABLE SHEAVE FIXED SHEAVE BELT DRIVE NO. BROWNING NO. OEM PART NO. BROWNING NO. OEM PART NO. BROWNING NO. OEM PART NO. 1VP34x7/8 31K6901 AK61x1 100244-20 AX54 100245-25 1VP40x7/8 79J0301 AK59x1 31K6801 AX55 100245-26...
  • Page 23 B-R410A Refrigerant REFRIGERANT STAGES - 092H, 102H, 120H Units charged with R410A refrigerant operate at much TRADITIONAL FIN/TUBE COIL higher pressures than R22. The expansion valve and (BOTH FANS ARE ENERGIZED WITH A Y1 DEMAND) liquid line drier provided with the unit are approved for use CONDENSER with R410A.
  • Page 24 This unit is factory charged and should require no further REFRIGERANT STAGES - 150H adjustment. If the system requires additional refrigerant, TRADITIONAL FIN/TUBE COIL reclaim the charge, evacuate the system, and add required nameplate charge. CONDENSER COIL (BOTH FANS ARE ENERGIZED NOTE - System charging is not recommended below STAGES 1 &...
  • Page 25 TABLE 7 580445-03 LGH/LCH092H Normal Operating Pressures - All-Aluminum - TXV 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) (psig) (psig)
  • Page 26 − 580445-03 LGH/LCH092H4 Charging Curves - All-Aluminum - TXV Outdoor Temperature (°F) Circuit 1 115° Circuit 2 105° 95° 85° 75° 65° Suction Pressure (psig) 580446-03 LGH/LCH102H Charging Curves - All-Aluminum - TXV Circuit 1 Outdoor Temperature (°F) Circuit 2 115°...
  • Page 27 580447-02 LGH/LCH120H Charging Curves - All-Aluminum - TXV Outdoor Temperature (°F) Circuit 1 Circuit 2 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 27...
  • Page 28 D-Refrigerant Charge and Check - Fin/Tube Coil & TABLE 10 580235-03 LGH/LCH092H Fin/Tube - TXV CIRCUIT 1 CIRCUIT 2 Outdoor LGH/LCH092H, 102H, 120H, 150H Dis­ Dis­ Coil Suction Suction WARNING-Do not exceed nameplate charge under charge charge Entering +10 psig +5 psig +10 psig +5 psig...
  • Page 29 TABLE 14 580239-02 Charge Verification - Approach Method - AHRI LGH/LCH120H Fin/Tube - TXV Testing CIRCUIT 1 CIRCUIT 2 (Fin/Tube Coil Continued) Outdoor Dis­ Dis­ Coil Suction Suction charge charge Entering 1- Using the same thermometer, compare liquid +10 psig +5 psig +10 psig +5 psig...
  • Page 30 E-Refrigerant Charge and Check - Fin/Tube Coil & TABLE 18 580679-01 LGH/LCH094U Outdoor Coil Discharge +10 LGH/LCH094U, 122U, 152U Entering Air Suction +5 psig psig Temp WARNING-Do not exceed nameplate charge under 655 F any condition. 755 F This unit is factory charged and should require no further 855 F adjustment.
  • Page 31 F-Compressor Controls Units Equipped With Two Fans - The Unit Controller de−energizes condenser fan 2 See unit wiring diagram to determine which controls are when outdoor temperature drops below 55°F (13°C). used on each unit. Fan 1 will continue to cycle with liquid pressure. 1- Units Equipped With All-Aluminum Coils - High Pressure Switch (S4, S7) Units Equipped With Three Fans -...

  • Page 32: 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 33: Heating Operation And Adjustments

    5- Turn gas valve switch to OFF. See figure 29. 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 30.

  • Page 34: Supply Air Inverter Start-Up

    SETTINGS > RTU Options > EDIT PARAMETER > Belt Drive Supply Air Inverter Start-Up ENTER DATA ID - 9 > MIN DAMPER LOW BLOWER = X.X % A-Design Specifications Measure the intake air CFM. If the CFM is lower than the Use table 22 to fill in field-provided, design specified design specified CFM for ventilation air, use the Unit blower CFM.
  • Page 35 TABLE 23 TABLE 24 MINIMUM AND MAXIMUM CFM MINIMUM AND MAXIMUM CFM BELT DRIVE STD. & HIGH EFFICIENCY UNITS BELT DRIVE ULTRA HIGH EFFICIENCY BLOWERS 094U4M, 122U4M, 152U4M Gas Heat Minimum CFM Gas Heat Minimum CFM Gas Heat Airflow Unit Size Unit Gas Heat Size...

  • Page 36: Supply Air Inverter And Direct Drive Operation

    Supply Air Inverter and Direct Drive Direct Drive Blower Start-Up Operation A-Set Blower Speed This is a summary of cooling operation. Refer to the sequence of operation provided in the Engineering 1- Use table 25 to fill in field-provided, design specified Handbook or Service Manual for more detail.
  • Page 37 The Unit Controller will calculate the “midpoint” CFM. TABLE 26 MINIMUM AND MAXIMUM CFM DIRECT DRIVE BLOWERS 094U4E, 122U4E, 152U4E Set Minimum Position 1 Gas Heat Minimum CFM Use the following menu in the Unit Controller to set “Min Unit Gas Heat Size Airflow CFM* OCP Blwr Low”...

  • Page 38: Hot Gas Reheat Operation And Start-Up

    solenoid valve, L14, routes hot discharge gas from the Hot Gas Reheat Start-Up And Operation compressor to the reheat coil. Return air pulled across General the evaporator coil is cooled and dehumidified; the Hot gas reheat units provide a dehumidifying mode of reheat coil adds heat to supply air.

  • Page 39: Service

    L14 Reheat Coil Solenoid Valve Service When Unit Controller input (Unit Controller J298-5 or The unit should be inspected once a year by a qualified J299-8) indicates room conditions require service technician. dehumidification, L14 reheat valve is energized (Unit Controller P269-3) and refrigerant is routed to the CAUTION reheat coil.
  • Page 40 C-Burners (Gas Units) 5- Check the alignment of the ignitor and the sensor as shown in figure 36 and table 28. Periodically examine burner flames proper appearance during the heating season. Before each 6- Replace burners and screws securing burner. heating season examine the burners for any deposits or 7- Replace access panel.
  • Page 41 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 36 F-Gas Heat Exchanger Inserts HEAT EXCHANGER ASSEMBLY 1- Inserts are installed on standard (130,000Btuh) and HEAT high (240,000Btuh) heat exchangers.

  • Page 42: Unit Controller Parameter Settings

    INSERT LOCATION STANDARD HEAT (130,000BTUH) HIGH HEAT (180,000BTUH) Note - No inserts on medium heat. INSERTS (4) INSERTS (2) FIGURE 38 TABLE 31 Factory Unit Controller Settings 580735 Use the Unit Controller to adjust parameters; menu paths Units with BACnet Module (Target) Settings are shown in each table.
  • Page 43 TABLE 32 TABLE 34 580733 580684 Units With BACnet Module (Kohl's) Settings LGH/LCH 122U4E (2-Compressor) Staged Direct Drive Use menu SETUP > NETWORK INTEGRATION. Set “BACNET” Para­ Field Factory and network address. meter Setting Setting Description BACNET MAC ADDRESS: Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings.
  • Page 44 TABLE 35 580682 LGH/LCH092H4M, 102H4M, 120H4M, 150H4M (2-Compressor) Staged Belt Drive Factory Setting Para­ Field meter Setting Description Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 3000 3400...
  • Page 45 TABLE 37 TABLE 38 580683 580731 LGH/LCH 094U4E (2-Compressor) Staged Direct Drive Units With Automated Logic DDC (Target) Settings Field Para­ Para­ Factory Field Factory Description Setting mete Setting Description meter Setting Setting Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS Note: Any changes to Smoke CFM setting must be adjusted be­...
  • Page 46 U = Unconfigured Single-Stage = S Dual-Stage = D [5] Network Module Unconfigured = U N = Not Installed Power Exhaust Control 4] B = BACnet Not Installed = N L = LonTalk (Lennox) Damper Position = A FIGURE 39 Page 46...
  • Page 47 Installed on DI-3 = 3 [5] Phase / Voltage Detection * N = Not Installed 1 = Enabled Internal (Lennox) 2 = External (A42) Phase Detection * When Phase / Voltage detection monitoring is enabled on a three-phase on DI-2 system and configured incorrectly will result in the system going into de­...
  • 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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