Lennox LG Series Installation Instructions Manual
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Lennox LG Series Installation Instructions Manual

Lennox LG Series Installation Instructions Manual

13/15/17.5/20/25 ton
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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.

Table of Contents

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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/U
ROOFTOP PACKAGED UNITS
507124-09
1/2021
Page 2
Supersedes 5/2020
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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 1: Table Of Contents

    E2021 INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, ser­ LGH/LCH156H vice or maintenance can cause property damage, (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: Top View

    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) 15 (381) BOTTOM RETURN 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 5−5/8 (143)

  • Page 5: Parts Arrangements

    LGH156, 180H/U, 210, 240H/U, 300S/U 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

    Units use R410A, an ozone-friendly HFC refrigerant. Shipping and Packing List Refer to the Cooling Start-Up section for precautions Package 1 of 1 contains: when installing unit. 1- Assembled unit Check unit for shipping damage. Receiving party should WARNING contact last carrier immediately if shipping damage is found. IMPORTANT - Hot gas reheat units require a specific Electric shock hazard and danger of explosion.

  • 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: Condensate Drain Connection

    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 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: Field Wire Routing

    CONTROL WIRING FIELD WIRE ROUTING A-Thermostat Location Room thermostat mounts vertically on a standard 2” X 4” handy box or on any non-conductive flat surface. Locate thermostat approximately 5 feet (1524mm) OPTIONAL SIDE ENTRY 120V GFI above the floor in an area with good air circulation at KNOCKOUTS average temperature.
  • Page 12 Wire runs over 150 feet (mm): based on the Unit Controller internal setpoints and the Use a local, isolated 24VAC transformer such as Lennox temperature from the A2 zone sensor. An optional cat #18M13 (20VA minimum) to supply power to RH Network Control Panel (NCP) can also be used to provide sensor as shown in figure 11.

  • Page 13: Blower Operation And Adjustments

    2- With fan switch in AUTO position, the blowers will FIELD WIRING REHEAT UNITS (Using A Humid­ cycle with demand. Blowers and entire unit will be off ity Sensor With More than 150 Ft. Wire Runs) when system switch is in OFF position. CONNECTED ISOLATED 24V IMPORTANT...
  • Page 14 C-Determining Unit CFM Note - Static pressure readings can vary if not taken where shown. IMPORTANT - Multi-staged supply air units are factory-set to run the blower at full speed when there is a 3- Referring to page 17, use static pressure and RPM blower (G) demand without a heating or cooling demand.
  • Page 15 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 LOCATION SUPPLY SUPPLY TURN TURN FIRST BRANCH OFF OF MAIN RUN MAIN DUCT RUN SUPPLY AIR SUPPLY AIR READING READING...
  • Page 16 PULLEY ALIGNMENT - WITH TENSIONER FIXED PULLEY ADJUSTABLE PULLEY TENSIONER BOLT AND TENSIONER ADJUSTMENT NUT BOLT ALIGN TENSIONER MARKS FIGURE 17 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 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 4 MANUFACTURER'S NUMBERS DRIVE COMPONENTS BELTS Drive ADJUSTABLE SHEAVE FIXED SHEAVE BELTS (STD.) SPLIT BUSHING (WITH TENSIONER) 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 1-3/16...

  • Page 20: Cooling Start-Up

    180U, 240U, & 300U - 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 1 156 VAV & 180 VAV ONLY EVAPORATOR CONDENSER STAGE 2 EVAPORATOR COIL COIL COILS EVAPORATOR (not to scale) COIL STAGE 1 STAGE 1 EVAPORATOR CIRCUIT 1 COIL STAGE 2 CIRCUIT 1 & 2 INTERTWINED STAGE 2 CONDENSER...
  • Page 22 180U, 240U, & 300U REFRIGERANT CIRCUITS CIRCUIT 2 CONDENSER COIL CIRCUIT 1 CONDENSER COIL CIRCUIT 1 AND 2 ALTERNATE THROUGH 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 CIRCUIT 1 -...
  • Page 23 6- Continue process until measured liquid 7- Example LGH/LCH156 CAV/staged non-reheat temperature agrees with target liquid Circuit 1: At 95°F outdoor ambient and a measured temperature. Do not go below the target liquid suction pressure of 130psig, the target liquid temperature when adjusting charge.
  • Page 24 TABLE 7 LGH/LCH156H VAV NORMAL OPERATING PRESSURES - ALUMINUM COIL - 580949-01 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...
  • Page 25 TABLE 8 LGH/LCH180H CAV/STAGED NORMAL OPERATING PRESSURES - ALUMINUM COIL - 580499-01 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...
  • Page 26 TABLE 10 LGH/LCH180H VAV NORMAL OPERATING PRESSURES - ALUMINUM COIL - 580951-01 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...
  • Page 27 TABLE 12 LGH/LCH210H REHEAT NORMAL OPERATING PRESSURES - ALUMINUM COIL - 580912-01 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...
  • Page 28 TABLE 14 LGH/LCH240H CAV/STAGED REHEAT NORMAL OPERATING PRESSURES - ALUMINUM COIL - 580914-01 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...
  • Page 29 TABLE 16 LGH/LCH300S NORMAL OPERATING PRESSURES - ALUMINUM COIL - 580556-02 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...
  • Page 30 LGH/LCH156 CAV/STAGED CHARGING CURVE CIRCUIT 1 - 580551-03 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH156 CAV/STAGED CHARGING CURVE CIRCUIT 2 - 580551-03 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 30 LGH/LCH156, 180, 210, 240, 300...
  • Page 31 LGH/LCH156 CAV/STAGED CHARGING CURVE CIRCUIT 3 - 580551-03 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH156 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 1 - 580907-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 31 507124-09 5/2020...
  • Page 32 LGH/LCH156 CAV/STAGED REHEAT CHARGING CURVE CIRCUIT 2 - 580907-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH156 CAV/STAGED REHEAT CHARGING CURVE CIRCUIT 3 - 580907-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 32 LGH/LCH156, 180, 210, 240, 300...
  • Page 33 LGH/LCH156 VAV CHARGING CURVE CIRCUIT 1 - 580950-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH156 VAV CHARGING CURVE CIRCUIT 2 - 580950-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 33 507124-09 5/2020...
  • Page 34 LGH/LCH156 VAV CHARGING CURVE CIRCUIT 3 - 580950-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 34 LGH/LCH156, 180, 210, 240, 300...
  • Page 35 LGH/LCH180 CAV/STAGED CHARGING CURVES CIRCUIT 1 - 580496-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 CAV/STAGED CHARGING CURVES CIRCUIT 2 - 580496-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 35 507124-09 5/2020...
  • Page 36 LGH/LCH180 CAV/STAGED CHARGING CURVES CIRCUIT 3 - 580496-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 36 LGH/LCH156, 180, 210, 240, 300...
  • Page 37 LGH/LCH180 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 1 - 580909-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 2 - 580909-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 37 507124-09 5/2020...
  • Page 38 LGH/LCH180 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 3 - 580909-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 VAV CHARGING CURVES CIRCUIT 1 - 580952-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 38 LGH/LCH156, 180, 210, 240, 300...
  • Page 39 LGH/LCH180 VAV CHARGING CURVES CIRCUIT 2 - 580952-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 VAV CHARGING CURVES CIRCUIT 3 - 580952-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 39 507124-09 5/2020...
  • Page 40 LGH/LCH210 CHARGING CURVE CIRCUIT 1 - 580553-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH210 CHARGING CURVE CIRCUIT 2 - 580553-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 40 LGH/LCH156, 180, 210, 240, 300...
  • Page 41 LGH/LCH210 CHARGING CURVE CIRCUIT 3 - 580553-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH210 REHEAT CHARGING CURVES CIRCUIT 1 - 580911-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 41 507124-09 5/2020...
  • Page 42 LGH/LCH210 REHEAT CHARGING CURVES CIRCUIT 2 - 580911-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH210 REHEAT CHARGING CURVES CIRCUIT 3 - 580911-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 42 LGH/LCH156, 180, 210, 240, 300...
  • Page 43 LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 1 - 580497-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 2 - 580497-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 43 507124-09 5/2020...
  • Page 44 LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 3 - 580497-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 4 - 580497-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 44 LGH/LCH156, 180, 210, 240, 300...
  • Page 45 LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 1 - 580913-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 2 - 580913-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 45 507124-09 5/2020...
  • Page 46 LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 3 - 580913-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 4 - 580913-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 46 LGH/LCH156, 180, 210, 240, 300...
  • Page 47 LGH/LCH240 VAV CHARGING CURVES CIRCUIT 1 - 580954-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 VAV CHARGING CURVES CIRCUIT 2 - 580954-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 47 507124-09 5/2020...
  • Page 48 LGH/LCH240 VAV CHARGING CURVES CIRCUIT 3 - 580954-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 VAV CHARGING CURVES CIRCUIT 4 - 580954-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 48 LGH/LCH156, 180, 210, 240, 300...
  • Page 49 LGH/LCH300S CHARGING CURVE CIRCUIT 1 - 580555-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S CHARGING CURVE CIRCUIT 2 - 580555-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 49 507124-09 5/2020...
  • Page 50 LGH/LCH300S CHARGING CURVE CIRCUIT 3 - 580555-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S CHARGING CURVE CIRCUIT 4 - 580555-02 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 50 LGH/LCH156, 180, 210, 240, 300...
  • Page 51 LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 1 - 580915-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 2 - 580915-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 51 507124-09 5/2020...
  • Page 52 LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 3 - 580915-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 4 - 580915-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 52 LGH/LCH156, 180, 210, 240, 300...
  • Page 53 E-Refrigerant Charge and Check - Fin/Tube Coil TABLE 19 LG/LC Series 156H Reheat - 580225-03 WARNING-Do not exceed nameplate charge under any condition. Outdoor Circuit 1 Circuit 2 Circuit 3 This unit is factory charged and should require no further Coil En­...
  • Page 54 TABLE 23 TABLE 27 LG/LC Series 240U - 580756-01 LG/LC Series 210H Std. - 580226-01 Outdoor Outdoor Circuit 1 Circuit 2 Circuit 3 Circuit 1 Circuit 2 Coil En­ Coil En­ tering Dis. Suc. Dis. Suc. Dis. Suc. tering Dis. +10 Suc.

  • Page 55: Condenser Fans

    F-Charge Verification - Approach Method - AHRI G-Compressor Controls Testing (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 56 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 57: Gas Heat Start-Up

    6- Thermal Protector (S5, S8, S31, S180) Gas Heat Start-Up (Gas Units) 156H, 180H, 210H, 240H, 300S - FOR YOUR SAFETY READ BEFORE LIGHTING Each compressor is protected by an internal thermal BEFORE LIGHTING smell all around the appliance area protector switch.
  • Page 58 3- This appliance is equipped with an ignition device WARNING which automatically lights the burner. Do not try to light the burner by hand. Danger of explosion. Can cause injury 4- Open or remove the heat section access panel. or death. Do not attempt to light manually.

  • Page 59: Heating Operation And Adjustments

    C-Heating Adjustment Heating Operation and Adjustments Main burners are factory-set and do not require adjustment. (Gas Units) The following manifold pressures are listed on the gas valve. A-Heating Sequence of Operation Natural Gas Units - Low Fire - 1.6” w.c. (not adjustable) Natural Gas Units - High Fire - 3.7”...

  • Page 60: Variable Air Volume Start-Up

    6- Press SAVE to display the current static pressure. Variable Air Volume Start-Up static pressure meets design specification, press SAVE again to set the setpoint. Units may contain an optional supply air blower If the static pressure does not meet the design equipped with a variable frequency drive A96 (VFD) specification, adjust the pressure and press SAVE which varies supply air CFM.
  • Page 61 7- Record new setpoints in table 32. SUPPLY AIR VFD BYPASS COMPONENTS Note - The Unit Controller will lock-out the unit for 5 minutes if static pressure exceeds 2.0”w.c. for 20 seconds. The Unit Controller will permanently shut down the unit after three occurrences.

  • Page 62: Multi-Staged Air Volume Start-Up

    TABLE 33 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 33 to fill in field-provided, design specified trol Stages blower CFM for appropriate unit. Htg. If only high and low cooling design specifications are 156, Clg.
  • Page 63 Blower / Heat CFM Set Minimum Position 2 Cooling High CFM Use the same menu in the Unit Controller to set “Min OCP Cooling Low CFM Blwr High” for the blower CFM above the “midpoint” CFM. Vent CFM When navigating into this menu, the Unit Controller will bring on the corresponding blower speed and allow 3- Adjust the blower RPM to deliver the target CFM damper position adjustment.
  • Page 64 TABLE 34 TABLE 35 MINIMUM AND MAXIMUM CFM - MINIMUM AND MAXIMUM CFM - 180U, 240U, 300U 156, 180H, 210, 240H, 300S Gas Heat Minimum CFM Gas Heat Minimum CFM Unit Gas Heat Size Airflow CFM Unit Gas Heat Size Airflow CFM LGH180U/240U/300U Low, Std., Med.

  • Page 65: Multi-Staged Air Volume Operation

    B-Three-Stage T'Stat, 3 and 4 Compressor Units AND Multi-Staged Air Volume 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 66 Four-Compressor Units: Y3 Demand - Compressors 1 and 2 On Y1 Demand - 180U, 240U, 300U - Two Compressors On Compressors 1 and 2 On (one from each circuit) 180U, 240U, 300U - Two Compressors On Blower Cooling High (one from each circuit) Dampers Maximum Open Blower Cooling Low Y2 Demand -...

  • Page 67: Hot Gas Reheat Operation And Start-Up

    TABLE 36 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 68 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 69 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 70 TABLE 37 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 71: 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 72 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 73: Vent Connector

    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 74 TABLE 42 - 580734 TABLE 40 - 580731 Units With Hot Gas Reheat Units With Automated Logic DDC (Target) Settings Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS Fact­ Para­ Field Facto­ Description meter Setting ry Set­ Para­ Field Setting meter ting Setting...
  • Page 75 TABLE 45 - 580746 LGH/LCH 240H/300S (4-Compressor) Staged 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 76 TABLE 47 - 580749-02 LGH/LCH 180U/300U (4-Compressor) Staged Factory Setting Para Field Setting Description meter 180U 240U 300U Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 6000 8000...
  • Page 77 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 43 Page 77 507124-09 5/2020...
  • Page 78 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 79: Start-Up Report

    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: Check primary transformer tap j Serial No.:____________________________________...

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