Lennox LGH180H Installation Instructions Manual
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Lennox LGH180H Installation Instructions Manual

13 ton, 15 ton, 17.5 ton, 20 ton, 25 ton rooftop packaged units
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E2017
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

Dimensions
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Parts Arrangements
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Gas Piping
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RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
LGH/LCH156H
LGH/LCH180H
LGH/LCH180U
LGH/LCH210H
LGH/LCH240H
LGH/LCH240U
LGH/LCH300S
ROOFTOP PACKAGED UNITS
507124-05
Page 2
12/2017
Supersedes 11/2017
Page 5
Page 6
Page 6
Page 7
Gas Heat Start-Up
Page 8
Page 8
Electric Heat Start-Up
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Page 10
Hot Gas Reheat Operation and Start-Up
Page 10
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(13 Ton)
(15 Ton)
(15 Ton)
(17.5 Ton)
(20 Ton)
(20 Ton)
(25 Ton)
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LCH180U SHOWN
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Page 20
Page 40
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Page 46
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Page 52
Page 54

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Summary of Contents for Lennox LGH180H

  • Page 1 E2017 INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, ser­ vice or maintenance can cause property damage, LGH/LCH156H (13 Ton) personal injury or loss of life. Installation and ser­ vice must be performed by a licensed professional LGH/LCH180H (15 Ton) HVAC installer or equivalent, service agency, or the gas supplier LGH/LCH180U (15 Ton)

  • Page 2: Dimensions

    LGH/LCH156 Unit Dimensions - Inches (mm) - Gas Heat Section Shown 107−3/4(2737) BASE 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 AIR OPENINGS 18 (457) 91−1/8 (2315) ALTERNATE (THRU THE BASE) BASE CONDENSATE DRAIN LOCATION 4−1/2...
  • Page 3 LGH/LCH180H 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) CONDENSA TE DRAIN LOCATION 4−1/2 5−5/8 (143)
  • Page 4 LGH/LCH180U, 210, 240H/U & 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) CONDENSA TE DRAIN LOCATION 4−1/2...

  • Page 5: Parts Arrangements

    LGH156, 180H/U, 210, 240H/U, 300S PARTS ARRANGEMENT CONDENSER FANS 180H Shown (3 FANS ON 156 UNITS; 6 EVAPORATOR FANS ON 180U, 210, 240H/U, FILTERS ECONOMIZER COIL & 300S UNITS (SIX - 24 X 24 X 2”) DAMPERS (OPTIONAL) BLOWERS UNIT CONTROLLER INVERTER (OPTIONAL)

  • Page 6: Shipping And Packing List

    The LGH156H gas/electric packaged rooftop unit is Requirements available in 260,000 & 360,000 Btuh heating input. The LGH180H/U, 210H, 240H/U, & 300S gas/electric See figure 1 for unit clearances. packaged rooftop units are available in 260,000, 360,000, or 480,000 Btuh heating inputs.

  • Page 7: 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 8: Duct Connection

    B-Horizontal Discharge Applications RIGGING 1- Units installed in horizontal airflow applications must use an LARMFH18/24 horizontal roof mounting *Weight Unit Lbs. frame. The supply air duct connects to the horizontal LG 156, LC 156, LC 180H 2350 1066 supply air opening on the LARMFH18/24. The return LG 180H, LC180U, LG 210 air duct connects to the unit horizontal return air 2855 1295...

  • 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: Pressure Test Gas Piping

    Pressure Test Gas Piping High Altitude Derate Locate the high altitude conversion sticker in the unit When pressure testing gas lines, the gas valve must literature bag. Fill out the conversion sticker and affix next be disconnected and isolated. Gas valves can be to the unit nameplate.
  • Page 11 C-Wire Connections FIELD WIRE ROUTING The Unit Controller will operate the unit from a thermostat or zone sensor based on the System Mode. The default System Mode is the thermostat mode. Refer OPTIONAL to the Unit Controller Installation and Setup Guide to SIDE ENTRY 120V GFI KNOCKOUTS...
  • Page 12 DI−4 Wire runs over 150 feet (mm): SWITCH Use a local, isolated 24VAC transformer such as Lennox cat #18M13 (20VA minimum) to supply power to RH sensor as shown in figure 11. Use two shielded cables Use 24 VAC (R) from any terminal containing 20AWG minimum, twisted pair conductors available on J299−2, −5, or −7.

  • Page 13: Blower Operation And Adjustments

    B-Blower Access Blower Operation and Adjustments 1- Disconnect jack/plug connector to blower motor. Also Supply Air Inverter Units - The blower rotation will disconnect jack/plug connector heating limit switches always be correct on units equipped with an inverter. on gas units. Checking blower rotation is not a valid method of determining voltage phasing for incoming power.
  • 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 - NO TENSIONER PULLEY ALIGNMENT - WITH TENSIONER ALIGNED ALIGNED TENSIONER MOTOR BLOWER BELT PULLEY PULLEY BELT MOTOR BLOWER NOT ALIGNED PULLEY PULLEY NOT ALIGNED FIGURE 15 FIGURE 16 PULLEY ALIGNMENT - WITH TENSIONER FIXED PULLEY ADJUSTABLE PULLEY TENSIONER BOLT AND TENSIONER ADJUSTMENT NUT...
  • Page 16 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. See deflection force should be 7 lbs. (48kPa). figure 17.
  • Page 17 Page 17...

  • Page 18: Blower Data

    BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Efficiency Nominal hp Maximum hp 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...
  • Page 19 TABLE 3 MANUFACTURER'S NUMBERS DRIVE COMPONENTS BELTS (WITH TENSION­ Drive ADJUSTABLE SHEAVE FIXED SHEAVE BELTS (STD.) SPLIT BUSHING H.P. 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 1-7/16...

  • Page 20: Cooling Start-Up

    180U & 240U - Cooling Start-Up First-stage thermostat demand will energize one of IMPORTANT-The crankcase heater must be energized the following compressor combinations: for 24 hours before attempting to start compressor. Set Compressor 1 (circuit 1) and Compressor 3 (circuit 2) thermostat so there is no demand to prevent Compressor 1 (circuit 1) and Compressor 4 (circuit 2) compressors from cycling.
  • Page 21 156, 180H, & 210 REFRIGERANT CIRCUITS STAGE 1 CONDENSER COILS EVAPORATOR COIL STAGE 2 EVAPORATOR COIL STAGE 1 EVAPORATOR COIL STAGE 2 CONDENSER COILS FIGURE 19 240H & 300S REFRIGERANT CIRCUITS EVAPORATOR COIL STAGE 2 EVAPORATOR COIL STAGE 1 EVAPORATOR STAGE 1 COIL CONDENSER COIL...
  • Page 22 180U & 240U REFRIGERANT CIRCUITS CIRCUIT 2 CONDENSER COIL CIRCUIT 1 CONDENSER COIL CIRCUIT 1 AND 2 CIRCUIT 1 AND 2 ALTERNATE THROUGH ALTERNATE THROUGH THE EVAPORATOR COIL THE EVAPORATOR COIL (not to scale) Y1=Compressor 1 or 2 AND Compressor 3 or 4 Y2=Compressor 1, 2, 3, 4 CIRCUIT 2 - COMPRESSOR 3 AND 4...
  • Page 23 D-Refrigerant Charge and Check - All-Aluminum Coils charging curve on Page 26 through Page 35 to determine a target liquid temperature. WARNING-Do not exceed nameplate charge under any condition. Note - Pressures are listed for sea level applications. This unit is factory charged and should require no further 4- Use the same thermometer to accurately measure the adjustment.
  • Page 24 TABLE 5 LGH/LCH180H NORMAL OPERATING PRESSURES - ALUMINUM COIL Normal Operating Pressures 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)
  • Page 25 TABLE 7 LGH/LCH240H NORMAL OPERATING PRESSURES - ALUMINUM COIL Normal Operating Pressures 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)
  • Page 26 LGH/LCH156 CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH156 CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 26 LGH/LCH156, 180, 210, 240, 300S...
  • Page 27 LGH/LCH156 CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 27 507124-04 3/2016...
  • Page 28 LGH/LCH180 CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 28 LGH/LCH156, 180, 210, 240, 300S...
  • Page 29 LGH/LCH180 CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 29 507124-04 3/2016...
  • Page 30 LGH/LCH210 CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH210 CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 30 LGH/LCH156, 180, 210, 240, 300S...
  • Page 31 LGH/LCH210 CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 31 507124-04 3/2016...
  • Page 32 LGH/LCH240 CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 32 LGH/LCH156, 180, 210, 240, 300S...
  • Page 33 LGH/LCH240 CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CHARGING CURVE CIRCUIT 4 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 33 507124-04 3/2016...
  • Page 34 LGH/LCH300S CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 34 LGH/LCH156, 180, 210, 240, 300S...
  • Page 35 LGH/LCH300S CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S CHARGING CURVE CIRCUIT 4 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 35 507124-04 3/2016...
  • Page 36 E-Refrigerant Charge and Check - Fin/Tube Coil TABLE 10 LG/LC Series 156H Reheat WARNING-Do not exceed nameplate charge under any condition. Circuit 1 Circuit 2 Circuit 3 This unit is factory charged and should require no further Outdoor Dis. Suc. Dis.
  • Page 37 TABLE 14 TABLE 18 LG/LC Series 240U LG/LC Series 210H Std. Circuit 1 Circuit 2 Circuit 3 Outdoor Circuit 1 Circuit 2 Outdoor Coil En­ Dis. Suc. Dis. Suc. Dis. Suc. Coil En­ Dis. +10 Suc. +5 Dis. +10 Suc. +5 tering tering psig...
  • Page 38 F-Charge Verification - Approach Method - AHRI Testing G-Compressor Controls (Fin/Tube Coil) See unit wiring diagram to determine which controls are used on each unit. 1- Using the same thermometer, compare liquid 1- High Pressure Switch (S4, S7, S28, S96) temperature to outdoor ambient temperature.
  • Page 39 180H 240H & 300S All four condenser fans are energized on a Y1 cooling Condenser fans 1, 2 and 3 are energized on a Y1 demand and continue to operate when Y2 demand is cooling demand; condenser fans 4, 5 and 6 are initiated.

  • Page 40: Gas Heat Start-Up

    6- Thermal Protector (S5, S8, S31, S180) Gas Heat Start-Up (Gas Units) 180H, 240H - FOR YOUR SAFETY READ BEFORE LIGHTING Each compressor is protected by an external BEFORE LIGHTING smell all around the appliance area temperature switch. The N.C. switch opens at 248°F for gas.
  • Page 41 A-Placing Unit In Operation 4- Open or remove the heat section access panel. 5- Turn gas valve switch to OFF. See figure 26. On WARNING Honeywell VR8305Q gas valves, turn the knob on the gas valve clockwise to “OFF”. Do not force. See Danger of explosion and fire.

  • Page 42: Heating Operation And Adjustments

    Heating Operation and Adjustments Electric Heat Start-Up (LCH Units) (Gas Units) Factory- or Field-Installed Option A-Heating Sequence of Operation Electric heat will stage on and cycle with thermostat 1- On a heating demand the combustion air inducer demand. Number of stages of electric heat will vary starts immediately.
  • Page 43 TABLE 22 Blower / Heat CFM Blower CFM Design Specifications Cooling High CFM T'Stat or Design Cooling Low CFM Unit Blower Speed Zone Con­ Specified Vent CFM trol Stages Htg. 3- Adjust the blower RPM to deliver the target CFM based on the measured static pressure using the 156, Clg.
  • Page 44 Set Minimum Position 2 TABLE 23 MINIMUM AND MAXIMUM CFM - Use the same menu in the Unit Controller to set “Min OCP 156, 180H, 210, 240H, 300S Blwr High” for the blower CFM above the “midpoint” CFM. Gas Heat Minimum CFM When navigating into this menu, the Unit Controller will bring on the corresponding blower speed and allow Unit...
  • Page 45 TABLE 24 MINIMUM AND MAXIMUM CFM - 180U, 240U Gas Heat Minimum CFM Unit Gas Heat Size Airflow CFM LGH180U/240U Low, Std., Med. 4500 LGH180U//240U High 5125 Electric Heat Minimum CFM Unit Heat Size (kW) Airflow CFM LCH180U/240U 6000 Cooling 1 Minimum CFM - 130 CFM/ton Unit Blower Speed Airflow CFM...

  • Page 46: Supply Air Inverter Operation

    B-Three-Stage T'Stat, 3 and 4 Compressor Units AND Supply Air Inverter Operation Zone Sensor (4 Clg. Stages), 3-Compressor Units This is a summary of cooling operation. Refer to the 1-Economizer With Outdoor Air Suitable sequence of operation provided in the Engineering Three-Compressor Units: Handbook or Service Manual for more detail.
  • Page 47 Four-Compressor Units: Y3 Demand - Compressors 1 and 2 On Y1 Demand - 180U, 240U - Two Compressors On Compressors 1 and 2 On (one from each circuit) 180U, 240U - Two Compressors On Blower Cooling High (one from each circuit) Dampers Maximum Open Blower Cooling Low Y4 Demand -...
  • Page 48 TABLE 25 Hot Gas Reheat Start-Up And Operation 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 5.00 solenoid valves, L14 and L30, route hot discharge gas from the compressor to the reheat coil.
  • Page 49 REHEAT MODE REFRIGERANT ROUTING 156, 180H, & 210 UNITS STAGE 2 EVAPORATOR Note: Two refrigerant circuits are shown; COIL both circuits operate during reheat. EXPANSION STAGE 1 VALVES EVAPORATOR COIL CIRCUIT 1 CONDENSER COIL REHEAT COIL CIRCUIT 2 CONDENSER COIL CHECK VALVE REHEAT...
  • Page 50 REHEAT MODE REFRIGERANT ROUTING 240 AND 300S UNITS STAGE 2 Note: Two refrigerant circuits are shown; EVAPORATOR both circuits operate during reheat. COIL EXPANSION VALVES STAGE 1 EVAPORATOR CIRCUIT 2 COIL CONDENSER COIL REHEAT COIL CHECK VALVE CIRCUIT 1 CONDENSER COIL REHEAT VALVE...
  • Page 51 TABLE 26 REHEAT OPERATION Two-Stage Thermostat - Default Operation T'stat and Humidity Demands 156, 180H, 210 (3-Compressors) 240H, 300S (4-Compressors) Reheat Only Compressor 1 & 2 Reheat Compressor 1 & 2 Reheat Compressor 1 & 2 Reheat and Compressor 1 & 2 Reheat and Reheat &...

  • Page 52: 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 53 ideal cleaning schedule. With power supply IGNITOR disconnected, the condition of the inducer wheel can be SPARK GAP determined by looking through the vent opening. SHOULD BE 1/8” (3mm) Clean combustion air inducer as follows: 1- Shut off power supply and gas to unit. 2- Disconnect pressure switch...
  • Page 54 H-Condenser Coil HEAT EXCHANGER ASSEMBLY All-Aluminum Coil - HEAT Clean condenser coil annually with water and inspect EXCHANGER TUBE monthly during the cooling season. Clean the coil by spraying the coil steadily and uniformly COMBUSTION AIR INDUCER from top to bottom. Do not exceed 900 psi or a 45_ angle; nozzle must be at least 12 inches from the coil face.
  • Page 55 TABLE 31 TABLE 29 580734 580731 Units With Hot Gas Reheat Units With Automated Logic DDC (Target) Settings Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS Para­ Factory Field Para­ Factory Field Description meter Setting Setting meter Setting Setting Description Use SETTINGS >...
  • Page 56 TABLE 34 580746 LGH/LCH 240H/300S (4-Compressor) MSAV Factory Setting Para- Field Setting Description meter 240S 300S Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 8000 10000 CFM Blower CFM during smoke detection.
  • Page 57 TABLE 35 580749 LGH/LCH 180U/240U (4-Compressor) MSAV Factory Setting Para Field Setting Description meter 180U 240U Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 6000 8000 CFM Blower CFM during smoke detection.
  • Page 58 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 38 Page 58 LGH/LCH156, 180, 210, 240, 300S...
  • Page 59 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...

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