Lennox LCH036 Installation Instructions Manual
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Air Conditioner
  5. LCH 036
  6. Installation instructions manual

Lennox LCH036 Installation Instructions Manual

Hide thumbs Also See for LCH036:
Table of Contents

Advertisement

Quick Links

Litho U.S.A.
2014
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
Dimensions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangements
. . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
. . . . . . . . . . . . . . . . . . . .
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Support
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct Connection
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rigging Unit For Lifting
. . . . . . . . . . . . . . . . . . . . . . .
Horizontal Air Discharge
. . . . . . . . . . . . . . . . . . . . . .
Condensate Drains
. . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Test Gas Piping
. . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
LGH/LCH036, 048,
060 & 072
3, 4, 5 and 6 Ton
GAS AND COOLING PACKAGED UNITS
507410-02
12/2014
Supersedes 8/2014
High Altitude Derate
Electrical Connections
Blower Operation and Adjustments
Cooling Start-Up
Cooling Operation
Page 2
Gas Heat Start-Up
Page 3
Heating Operation and Adjustments
Page 4
Electric Heat Start-Up
Page 4
Advanced Air Flow Control Start-Up
Page 4
Hot Gas Reheat Startup
Page 5
Service
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 5
Factory Unit Controller Settings
Page 5
Page 6
Page 6
Page 8
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
Page 9
contact with sharp edges.
LG SHOWN
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
CAUTION
Page 9
Page 9
Page 12
Page 28
Page 38
Page 39
Page 40
Page 40
Page 41
Page 43
Page 44
Page 48

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LCH036 and is the answer not in the manual?

Questions and answers

Related Manuals for Lennox LCH036

Summary of Contents for Lennox LCH036

  • Page 1 INSTALLATION Litho U.S.A. INSTRUCTIONS 2014 LGH/LCH036, 048, WARNING 060 & 072 Improper installation, adjustment, alteration, ser­ 3, 4, 5 and 6 Ton vice or maintenance can cause property damage, personal injury or loss of life. Installation and ser­ vice must be performed by a licensed professional...
  • Page 2 LGH/LCH036, 048, 060, & 072 DIMENSIONS in. - Gas heat section shown 5−5/8 16−1/4 (143) (279) (413) (457) 5 (127) 7 (178) BOTTOM 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...
  • Page 3 CONDENSATE DRAIN COMBUSTION AIR INDUCER BURNERS GAS VALVE UNIT CONTROLLER COMPRESSOR LCH036, 048, 060, & 072 PARTS ARRANGEMENT REHEAT COIL EVAPORATOR (OPTIONAL) COIL CONDENSER FILTERS (4) 036, 048:16 X 20 X 2” 060, 072: 20 X 20 X 2” BLOWER...
  • Page 4 1992. Approved methods of recovery, recycling or S Return air temperature range between 55°F (13°C) reclaiming must be followed. Fines and/or incar­ ceration may be levied for non-compliance. and 80°F (27°C) must be maintained. Page 4 LGH/LCH036, 048, 060, 072...
  • Page 5 Frame must be of adequate and not to the unit. Supply and return plenums must strength and length. (H-style pick prevents damage be installed before setting the unit. to unit.) Page 5 LGH/LCH036, 048, 060, 072...
  • Page 6 1” (25 mm) per 10' (3 m) of line Á Á Á MOUNTING Á Á Á Á DOWNFLOW FRAME DOWNFLOW SUPPLY AIR RETURN AIR Á Á Á Á Á Á OPENING OPENING FIGURE 3 FIGURE 5 Page 6 LGH/LCH036, 048, 060, 072...
  • Page 7 See figure 8. HOLE IN CENTER OF COUPLING UNITS WITH HINGED PANELS CONDENSATE DRAIN MULLION REMOVE SCREWS After drilling the pilot hole, drill a 7/8” hole from the inside of the pan. FIGURE 8 FIGURE 10 Page 7 LGH/LCH036, 048, 060, 072...
  • Page 8 FIGURE 11 Do not use Teflon® tape to seal gas piping. Use a moderate amount of pipe compound on the gas pipe only. Make sure the two end threads are bare. Page 8 LGH/LCH036, 048, 060, 072...
  • Page 9 L1, L2, and L3 on the top of K1 in NOTE-In case emergency shut down is required, turn off control area above compressor. Secure power the main manual shut-off valve and disconnect main wiring with factory-installed wire ties provided in Page 9 LGH/LCH036, 048, 060, 072...
  • Page 10 The default System Mode is the thermostat mode. Refer to the Unit Controller Installation and Setup Guide to change the System Mode. Use the menu navigation arrows and select button; see Settings - Install. Page 10 LGH/LCH036, 048, 060, 072...
  • Page 11 Controller as shown in figure 16. Wire runs over 150 feet (mm): A2 SENSOR Use a local, isolated 24VAC transformer such as Lennox cat #18M13 (20VA minimum) to supply power to RH FIGURE 15 sensor as shown in figure 17. Use two shielded cables...
  • Page 12 J299−2, −5, or −7. Use Page 27 when installing units with any of the options or accessories listed. Refer to table 4 for FIGURE 18 minimum airflow when electric heat is installed. Page 12 LGH/LCH036, 048, 060, 072...
  • Page 13 Record any CFM Belt Min. Turns Open Maxi. Turns Open changes on the parameter settings label located on the A Section No minimum inside of the compressor access panel. Page 13 LGH/LCH036, 048, 060, 072...
  • Page 14 2- Apply perpendicular force to center of span (X) with 4- Tighten four bolts securing motor base to the enough pressure to deflect belt 1/64” for every inch mounting frame. of span length or 1.5mm per 100mm of span length. Page 14 LGH/LCH036, 048, 060, 072...
  • Page 15 MAXIMUM TENSION LINES MINIMUM TENSION TIGHTEN MOUNTING BOLT TO 22 LB./FT. ROTATE DRIVEN USING 9/16” WRENCH PULLEY TO SEAT BELT BRACKET TENSIONER FIGURE 24 TIGHTEST BELT POSITION TIGHTER FACTORY-SET BELT POSITION POSITION FIGURE 23 Page 15 LGH/LCH036, 048, 060, 072...
  • Page 16 Page 16...
  • Page 17 Page 17...
  • Page 18 Page 18...
  • Page 19 BLOWER DATA - BELT DRIVE - 3 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 20 BLOWER DATA - BELT DRIVE - 3 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 21 BLOWER DATA - BELT DRIVE - 4 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 22 BLOWER DATA - BELT DRIVE - 4 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 23 BLOWER DATA - BELT DRIVE - 5 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 24 BLOWER DATA - BELT DRIVE - 5 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 25 BLOWER DATA - BELT DRIVE - 6 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 26 BLOWER DATA - BELT DRIVE - 6 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
  • Page 27 BLOWER DATA BELT DRIVE KIT SPECIFICATIONS - 036-060 Model Motor HP No. of Drive Kits and RPM Range Speeds Nominal Maximum 0.75 0.86 low 449-673 - - - - - - - - - - - - - - - high 673-1010 1.15 - - -...
  • Page 28 3- Units contain one refrigerant circuit or stage. Discharge and suction pressures should operate at 4- Unit is charged with R-410A refrigerant. See unit rating plate for correct amount of charge. their normal start‐up ranges. Page 28 LGH/LCH036, 048, 060, 072...
  • Page 29 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) (psig) (psig) (psig) (psig) (psig) (psig) (psig) (psig) (psig) Page 29 LGH/LCH036, 048, 060, 072...
  • Page 30 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) (psig) (psig) (psig) (psig) (psig) (psig) (psig) (psig) (psig) Page 30 LGH/LCH036, 048, 060, 072...
  • Page 31 LGH/LCH036S CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH036H CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 31 LGH/LCH036, 048, 060, 072...
  • Page 32 LGH/LCH048S CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH048H CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 32 LGH/LCH036, 048, 060, 072...
  • Page 33 LGH/LCH060S CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH060H CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 33 LGH/LCH036, 048, 060, 072...
  • Page 34 LGH/LCH072H CHARGING CURVE - ALL-ALUMINUM COIL Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 34 LGH/LCH036, 048, 060, 072...
  • Page 35 Entering Air Temp +10 psig psig Entering Air Temp +10 psig psig 655 F 655 F 755 F 755 F 855 F 855 F 955 F 955 F 1055 F 1055 F 1155 F 1155 F Page 35 LGH/LCH036, 048, 060, 072...
  • Page 36 3- The approach method is not valid for grossly over or 655 F undercharged systems. Use tables 14 through 27 as 755 F a guide for typical operating pressures. 855 F 955 F 1055 F 1155 F Page 36 LGH/LCH036, 048, 060, 072...
  • Page 37 TXV assist circuit. Switch closes at + 34 kPa) and automatically resets at 90 psig + 5 550psig + 10 (3792kPa + 70kPa) and automatically psig (621 kPa + 34 kPa). resets at 400 PSIG (2758kPa + 70kPa). Page 37 LGH/LCH036, 048, 060, 072...
  • Page 38 Note - If dampers are at maximum open for three minutes, compressor 1 is energized and blower stays on cooling high. Y3 Demand - Compressors 1 and 2 On Blower Cooling High Dampers Maximum Open Page 38 LGH/LCH036, 048, 060, 072...
  • Page 39 LOW FIRE PRESSURE ADJUSTMENT Danger of explosion. Can cause injury or death. Do not attempt to light manually. Gas valve switch is shown in OFF position. Unit has a direct spark ignition system. FIGURE 26 Page 39 LGH/LCH036, 048, 060, 072...
  • Page 40 Danger of explosion. Can cause injury or death. Do not attempt to light manually. thermostat demand. See electric heat wiring diagram on Unit has a direct spark ignition system. unit for sequence of operation. Page 40 LGH/LCH036, 048, 060, 072...
  • Page 41 MAIN MENU button to go to the main menu and press the After the speed CFM are saved, the Unit Controller will cycle to BLOWER CALIBRATION. BACK button to go to the status screen. Page 41 LGH/LCH036, 048, 060, 072...
  • Page 42 Press the MAIN MENU button to go to the main menu and Unit Controller must have an occupied (OCP) press the BACK button to go to the status screen. thermostat demand. TABLE 31 MINIMUM / MAXIMUM CFM LGH/LCH036-060 Unit Parameter Settings LCH/LGH Default Factory Settings Parameter Name 036H4E 048H4E 060H4E SETUP >...
  • Page 43 3% (57% default) or the digital output de-energizes. The reheat deadband can be adjusted at Settings - Control menu. REHEAT MODE REFRIGERANT ROUTING RETURN OUTDOOR EVAPORATOR EXPANSION COIL VALVE REHEAT COIL SUPPLY COMPRESSOR CONDENSER COIL CHECK VALVE REHEAT VALVE FIGURE 28 Page 43 LGH/LCH036, 048, 060, 072...
  • Page 44 Compressor is operating, blower is on, and the reheat replaced prior to building occupation. See table 32 for valve is energized. correct filter size. Refer to local codes or appropriate Y2 demand: jurisdiction for approved filters. Page 44 LGH/LCH036, 048, 060, 072...
  • Page 45 Before each heating season examine the burners for any deposits or 6- Replace burners and screws securing burner. See blockage which may have occurred. figure 33. Page 45 LGH/LCH036, 048, 060, 072...
  • Page 46 Clean using mild detergent or commercial coil cleaner. Flush coil and condensate drain with water taking care not 3- Disconnect pressure switch tubing from combustion air inducer port. to get insulation, filters and return air ducts wet. Page 46 LGH/LCH036, 048, 060, 072...
  • Page 47 Remove wire ties connecting coils slabs and separate SUPPLY slabs 3-4” (76-102mm). Clean coils with detergent or commercial coil cleaner. BLOWER Rinse thoroughly with water and reassemble CONDENSER field-provided wire ties to connect coil slabs. COILS CONDENSER ACCESS PANEL FIGURE 35 Page 47 LGH/LCH036, 048, 060, 072...
  • Page 48 DCV max. open damper. 0=controlled 580732 by network. Units With Room Sensor, CPC/LSE Gateway Settings Time delay between heating and cool­ Use menu SETUP > NETWORK INTEGRATION. Set “L CONNEC­ ing mode. TION” and network address. LCONN ADDRESS: Page 48 LGH/LCH036, 048, 060, 072...
  • Page 49 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 36 Page 49 LGH/LCH036, 048, 060, 072...
  • Page 50 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 51: Table Of Contents

    INSTALLATION Litho U.S.A. INSTRUCTIONS 2015 WARNING LGH092H, LCH092H (7.5 Ton) Improper installation, adjustment, alteration, ser­ LGH094U, LCH094U vice or maintenance can cause property damage, (7.5 Ton) personal injury or loss of life. Installation and ser­ LGH102H, LCH102H vice must be performed by a licensed professional (8.5 Ton) HVAC installer or equivalent, service agency, or the LGH120H, LCH120H...

  • Page 52: 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 53 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 54 LGH092, 094, 102, 120, 122, 150 & 152 PARTS ARRANGEMENT BLOWER MOTOR CONDENSER FANS 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 55: 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. Check unit for shipping damage. Receiving party should Electric shock hazard and danger of contact last carrier immediately if shipping damage is found.

  • Page 56: 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 57: 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 58 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 59: 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 60: 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 61: High Altitude Derate

    CONTROL WIRING High Altitude Derate Locate the high altitude conversion sticker in the unit CAUTION literature bag. Fill out the conversion sticker and affix next Electrostatic discharge can affect electronic com­ to the unit nameplate. ponents. Take precautions during unit installation Refer to table 2 for high altitude adjustments.
  • Page 62 2- Install thermostat assembly in accordance with be used to initiate dehumidification instead of a instructions provided with thermostat. sensor. 2- Make wiring connections as shown in figure 14 for 3- Connect thermostat wiring to the bottom of the Unit thermostat mode or figure 13 for room sensor Controller.
  • Page 63 Connect both cable shield drain wires to the Unit Controller as shown in figure 15. Wire runs over 150 feet (mm): Use a local, isolated 24VAC transformer such as Lennox DO-1 cat #18M13 (20VA minimum) to supply power to RH sensor as shown in figure 16.

  • Page 64: Blower Operation And Adjustments

    A-Blower Operation Blower Operation and Adjustments Note - On units with staged blowers, use the Unit Controller to start the blower. Refer to the appropriate Belt Drive With Supply Air Inverter or Direct Drive start-up section. Units - The blower rotation will always be correct on units Initiate blower only (G) demand at thermostat according to instructions provided with thermostat.
  • Page 65 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 66 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 20 C-Determining Unit CFM 3- Referring to pages 19 through 22, use static pressure and RPM readings to determine unit CFM.
  • Page 67 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 68 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 69 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 70 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 71 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 72: Cooling Start-Up

    TABLE 4 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 73 will energize the economizer; a second-stage IMPORTANT demand will energize compressor 1. 3- Ultra high efficiency units have a tandem refrigerant Mineral oils are not compatible with R410A. If oil must be added, it must be a polyol ester oil. ciruit.
  • Page 74 D-Refrigerant Charge and Check - All-Aluminum Coil charging curve to determine a target liquid temperature. 092H, 102H, 120H, 150S Units WARNING-Do not exceed nameplate charge under Note - Pressures are listed for sea level applications. any condition. 4- Use the same thermometer to accurately measure the This unit is factory charged and should require no further liquid temperature (in the outdoor section).
  • Page 75 TABLE 6 LGH/LCH090H 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) (psig)
  • Page 76 − LGH/LCH092H4 Charging Curves - All-Aluminum - TXV Circuit 1 Outdoor Temperature (°F) Circuit 2 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH102H Charging Curves - All-Aluminum - TXV Circuit 1 Outdoor Temperature (°F) Circuit 2 115° 105° 95°...
  • Page 77 LGH/LCH120H Charging Curves - All-Aluminum - TXV Outdoor Temperature (°F) Circuit 1 Circuit 2 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH150S Charging Curves - All-Aluminum - RFC Outdoor Temperature (°F) Circuit 1 Circuit 2 115° 105° 95° 85°...
  • Page 78 E-Refrigerant Charge and Check - Fin/Tube Coil & TXV TABLE 10 LGH/LCH092H Fin/Tube - TXV LGH/LCH092H, 102H, 120H, 150S CIRCUIT 1 CIRCUIT 2 WARNING-Do not exceed nameplate charge under Outdoor Dis­ Dis­ Coil any condition. Suction Suction charge charge Entering This unit is factory charged and should require no further +5 psig +5 psig...
  • Page 79 TABLE 14 Charge Verification - Approach Method - AHRI Testing LGH/LCH120H Fin/Tube - TXV (Fin/Tube Coil Continued) CIRCUIT 1 CIRCUIT 2 1- Using the same thermometer, compare liquid Outdoor Dis­ Dis­ Coil temperature to outdoor ambient temperature. Suction Suction charge charge Entering +10 psig...
  • Page 80 F-Refrigerant Charge and Check - Fin/Tube Coil & RFC charging curve to determine a target liquid temperature. LGH/LCH092H, 102H, 120H, 150S WARNING-Do not exceed nameplate charge under Note - Pressures are listed for sea level applications. any condition. 4- Use the same thermometer to accurately measure the This unit is factory charged and should require no further liquid temperature (in the outdoor section).
  • Page 81 LGH/LCH150S Charging Curves - Fin/Tube - RFC Outdoor Temperature (°F) Circuit 1 Circuit 2 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 31...
  • Page 82 G-Refrigerant Charge and Check - Fin/Tube Coil & TXV TABLE 19 LGH/LCH094U LGH/LCH094U, 122U, 152U Outdoor Coil Discharge +10 Entering Air Suction +5 psig psig WARNING-Do not exceed nameplate charge under Temp any condition. 655 F This unit is factory charged and should require no further 755 F adjustment.
  • Page 83 H-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 84: 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 85: Heating Operation And Adjustments

    5- Turn gas valve switch to OFF. See figure 27. 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 28.

  • Page 86: 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 23 to fill in field-provided, design specified design specified CFM for ventilation air, use the Unit blower CFM.
  • Page 87 TABLE 24 TABLE 25 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 Unit Gas Heat Size Size...

  • Page 88: 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 26 to fill in field-provided, design specified Handbook or Service Manual for more detail.
  • Page 89 The Unit Controller will calculate the “midpoint” CFM. TABLE 27 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 90 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 91: 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 92 C-Burners (Gas Units) 5- Check the alignment of the ignitor and the sensor as shown in figure 34 and table 29. 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 93 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 34 E-Flue Passageway and Flue Box (Gas Units) HEAT EXCHANGER ASSEMBLY 1- Remove combustion air inducer assembly as HEAT described in section D.
  • Page 94 Clean the all-aluminum coil by spraying the coil steadily If Interlink compressor replacement is necessary, call and uniformly from top to bottom. Do not exceed 900 psi 1-800-4-LENNOX (1-800-453-6669). or a 45_ angle; nozzle must be at least 12 inches from the IMPORTANT coil face.
  • Page 95 TABLE 33 Factory Unit Controller Settings 580733 Units With BACnet Module (Kohl's) Settings Use the Unit Controller to adjust parameters; menu paths Use menu SETUP > NETWORK INTEGRATION. Set “BACNET” and network address. are shown in each table. Refer to the Unit Controller manual provided with each unit.
  • Page 96 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 97 TABLE 37 TABLE 38 580683 580731 LGH/LCH 094U4E (2-Compressor) Staged Direct Drive Units With Automated Logic DDC (Target) Settings Para­ Para­ Factory Field Description met­ Field meter Setting Setting Factory Setting Description Setting Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS Note: Any changes to Smoke CFM setting must be adjusted be­...
  • Page 98 TABLE 41 580684 LGH/LCH 122U4E (2-Compressor) Staged Direct Drive Para­ met­ Field Factory Setting Description Setting Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS > EDIT PARAMETERS 4000 Blower CFM during smoke detection.
  • Page 99 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 37 Page 49...
  • Page 100 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 101 INSTALLATION INSTRUCTIONS Litho U.S.A. RETAIN THESE INSTRUCTIONS 2012 FOR FUTURE REFERENCE LGH/LCH242H (20 TON) WARNING LGH/LCH300H (25 TON) Improper installation, adjustment, alteration, ser­ LGH/LCH360H vice or maintenance can cause property damage, (30 TON) personal injury or loss of life. Installation and ser­ vice must be performed by a qualified installer, ser­...

  • Page 102: Dimensions

    LGH/LCH242, 300 & 360 Dimensions - LGH Heat Section Shown 4-1/4 (108) 5-3/4 78-1/2 (1994) (146) 15 (381) BOTTOM RETURN AIR OPENING 18 (457) 17-1/2 (711) (711) (445) 20 (508) 4-1/2 20 (508) (114) BOTTOM SUPPL Y AIR OPENINGS 4 (102) BOTTOM POWER/GAS ENTRY X 8 inches (127 X 203 mm) 9 (229) TOP VIEW...

  • Page 103: Shipping And Packing List

    S A room thermostat must control the unit. The use of Shipping and Packing List fixed jumpers that will provide continuous heating or Package 1 of 1 contains: cooling is not allowed. 1- Assembled unit S A pre-filter must be installed at the entry to the return Check unit for shipping damage.

  • Page 104: Unit Support

    3- Duct must be attached to the roof mounting frame WARNING and not to the unit; supply and return plenums must be installed before setting the unit. Electric shock hazard and danger of Installer's Roof Mounting Frame explosion. Can cause injury, death or product or property damage.

  • Page 105: Rigging Unit For Lifting

    Condensate Drains CAUTION Remove cap and make drain connection to the 1” N.P.T. In downflow applications, do not drill or punch drain coupling provided on unit. A trap must be installed holes in base of unit. Leaking in roof may occur if between drain connection and an open vent for proper unit base is punctured.

  • Page 106: Gas Piping

    joint union between the gas control manifold and the main Pressure Test Gas Piping (Gas Units) manual shut-off valve. See figure 4 for gas supply piping When pressure testing gas lines, the gas valve must entering outside the unit. Figure 5 shows complete be disconnected and isolated.

  • Page 107: High Altitude Derate

    6- Install back filter bracket on unit division panel as High Altitude Derate shown in figure 9. Locate the high altitude conversion sticker in the unit OUTDOOR AIR HOOD literature bag. Fill out the conversion sticker and affix next to the unit nameplate. See Detail A Refer to table 2 for high altitude adjustments.

  • Page 108: Electrical Connections

    RIGHT FILTER FILTERS SEAL LEFT FILTER SEAL FIGURE 10 -drafts or dead spots behind doors and in corners Electrical Connections -hot or cold air from ducts POWER SUPPLY WARNING -radiant heat from sun or appliances -concealed pipes and chimneys Do not apply power or close disconnect switch until installation is complete.

  • Page 109: Blower Operation And Adjustments

    3- Third-Party Zoning - FIELD WIRING WITH ELECTRONIC AND The Unit Controller will operate up to four stages of ELECTRO-MECHANICAL THERMOSTATS heating and cooling based on a third-party zoning (Thermostat Mode) system. Only 4 inputs are required to control the rooftop unit: G (blower enable), OCP (occupied), Y1 24 V POWER J297A...
  • Page 110 Units Equipped With Optional VFD or Voltage or IMPORTANT Phase Detection - The Unit Controller checks the incoming power during start-up. If the voltage or phase is Three Phase Scroll Compressor Voltage Phasing incorrect, the Unit Controller will display an alarm and the Three phase scroll compressors must be phased se­...
  • Page 111 C-Determining Unit CFM D-Blower Belt Adjustment Maximum life and wear can be obtained from belts only if VFD Units - Refer to the Optional Supply Air VFD proper pulley alignment and belt tension are maintained. section to initiate a blower only (G) demand. Tension new belts after a 24-48 hour period of operation.
  • Page 112 PULLEY ALIGNMENT - WITH TENSIONER PULLEY ALIGNMENT - NO TENSIONER ALIGNED ALIGNED TENSIONER MOTOR BLOWER BELT PULLEY PULLEY BELT MOTOR BLOWER PULLEY PULLEY NOT ALIGNED NOT ALIGNED FIGURE 16 FIGURE 17 BLOWER ASSEMBLY - WITH TENSIONER TENSIONER BODY NUT MOUNTING BOLT TENSIONER ALIGN...
  • Page 113 Page 13...
  • Page 114 BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Efficiency Nominal Maximum Drive Kit Number RPM Range Standard 5.75 660 - 810 Standard 5.75 770 - 965 Standard 5.75 570 - 720 Standard 5.75 480 - 630 Standard 5.75 410 - 535 Standard 8.63 715 - 880...

  • Page 115: Cooling Start-Up

    TABLE 4 MANUFACTURER'S NUMBERS (60 HZ) DRIVE COMPONENTS ADJUSTABLE SHEAVE FIXED SHEAVE BELTS BELTS W/ TENSIONER SPLIT BUSHING Drive OEM Part Supplier OEM Part Supplier OEM Part Supplier OEM Part OEM Part Supplier No. Supplier No. 1VP71x1-3/8 100239-06 BK140H 100788-13 BX78 100245-44 BX77...
  • Page 116 4- Each refrigerant circuit is separately charged with 5- Refer to Cooling Operation and Adjustment section for R410A refrigerant. See unit rating plate for correct proper method to check refrigerant charge. amount of charge. CAV REFRIGERANT CIRCUITS EVAPORATOR COIL STAGE 2 EVAPORATOR COIL STAGE 1...
  • Page 117 C-R410A Refrigerant mode with economizer disabled until system stabilizes (approximately five minutes). Make sure all Units charged with R410A refrigerant operate at much outdoor air dampers are closed. higher pressures than R22. The expansion valve and 2- Check each system separately with all stages liquid line drier provided with the unit are approved for use operating.
  • Page 118 TABLE 5 LGH/LCH242 VAV 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) (psig) (psig) (psig) (psig) (psig)
  • Page 119 TABLE 7 LGH/LCH300H VAV 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) (psig) (psig) (psig) (psig) (psig)
  • Page 120 TABLE 9 LGH/LCH360 VAV 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) (psig) (psig) (psig) (psig) (psig)
  • Page 121 LGH/LCH242 VAV Circuit 1 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH242 VAV Circuit 2 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 21...
  • Page 122 LGH/LCH242 VAV Circuit 3 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH242 VAV Circuit 4 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 22...
  • Page 123 LGH/LCH300H CAV Circuit 1 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300H CAV Circuit 2 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 23...
  • Page 124 LGH/LCH300H CAV Circuit 3 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300H CAV Circuit 4 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 24...
  • Page 125 LGH/LCH300H VAV Circuit 1 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300H VAV Circuit 2 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 25...
  • Page 126 LGH/LCH300H VAV Circuit 3 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300H VAV Circuit 4 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 26...
  • Page 127 LGH/LCH360 CAV Circuit 1 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH360 CAV Circuit 2 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 27...
  • Page 128 LGH/LCH360 CAV Circuit 3 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH360 CAV Circuit 4 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 28...
  • Page 129 LGH/LCH360 VAV Circuit 1 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH360 VAV Circuit 2 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 29...
  • Page 130 LGH/LCH360 VAV Circuit 3 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH360 VAV Circuit 4 Charging Curve Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 30...

  • Page 131: Gas Heat Start-Up

    F-Compressor Controls Condenser fan 3 is de-energized when both S11 and S84 pressure switches (via K149) open due to low See unit wiring diagram to determine which controls are pressure. S11 and S84 are located in refrigerant used on each unit. circuits 1 and 2 respectively.

  • Page 132: Heating Operation And Adjustments

    HONEYWELL VR8305Q SERIES GAS VALVE WARNING HIGH FIRE Danger of explosion. Can cause injury LOW FIRE ADJUSTMENT or product or property damage. If ADJUSTMENT overheating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electrical supply.

  • Page 133: Electric Heat Start-Up

    2- Combustion air pressure switch proves inducer Electric Heat Start-Up (LCH Units) operation. After a 30-second pre-purge, power is Factory- or Field-Installed Option allowed to ignition control. Switch is factory set and requires no adjustment. Electric heat will stage on and cycle with thermostat demand.
  • Page 134 TABLE 11 PRESSURE TRANSDUCER WIRING VFD SUPPLY AIR STATIC PRESSURE SETPOINTS UNIT TWISTED ECTO Changes Static Pressure Setpoint TB18 PAIR Unit de-energized during smoke detection. See ECTO 0.02 5.01 to operate blower during smoke detection. 0.03 During ventilation 0.04 During heating DRAIN 0.05 During cooling...
  • Page 135 C-Supply Air VFD By-Pass (Optional) SUPPLY AIR VFD BY-PASS COMPONENTS IMPORTANT - All dampers must be open to prevent damage to duct work and dampers. 1- Turn off all power to unit. 2- Locate J/P246, J/P247, J/P248 and J/P249 connectors near the VFD. See figure 30. 3- Disconnect P246 from J246 and connect P249 to J246.

  • Page 136: Optional Economizer Settings

    When using ODE or DIF mode, change additional Optional Economizer Settings settings as follows: A-Control Settings ODE MODE The economizer is controlled by the Unit Controller which Set enthalpy setpoint to “A.” If the economizer is is located at the left corner of the unit control panel. The allowing air which is too warm or too humid to enter the economizer DIP switch and mode setting devices are at system, adjust the setting lower (B, C, or D).
  • Page 137 3- Measure outdoor air temperature. Mark the point on See table 15 for economizer operation with a standard the bottom line of chart 1 and label the point “A” (40_F, two-stage thermostat 4_C shown). Table 16 shows economizer operation with an energy 4- Measure return air temperature.
  • Page 138 BRWN DESCRIPTION A130 COMPONENT TB37 SENSOR, SOLID STATE ENTHALPY CONTROL, ERS A130 CONTROL, MAIN PANEL LENNOX SENSOR, ENTHALPY INDOOR CONTROL, REMOTE MIN POS (OPT) MOTOR, DAMPER ECONOMIZER MOTOR, EXHAUST DAMPER JACK, UNIT ECONOMIZER JACK, SENSOR OUTDOOR ENTHALPY J104 JACK, SENSOR RETURN AIR ENTHALPY...
  • Page 139 TABLE 15 ECONOMIZER OPERATION - Standard Two-Stage Thermostat (Default Option) Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á THERMOSTAT DEMAND DAMPER POSITION UNOCC.

  • Page 140: Optional Outdoor Air Cfm Control

    NOTE - Refer to local codes or authorities having Optional Outdoor Air CFM Control jurisdiction when determining design minimum outdoor Outdoor air CFM Control is a factory-installed option air requirements. available on units equipped with a supply air variable 5- Return the economizer DIP switch to original frequency drive (VFD) and economizer.

  • Page 141: Service

    Service MANUAL DAMPER SET DIP SWITCH The unit should be inspected once a year by a qualified OPEN DSET service technician. (Damper Set) CAUTION MIN POS Label all wires prior to disconnection when servic­ ing controls. Wiring errors can cause improper and NOTE - “Damper set”...
  • Page 142 Blower shaft bearings are prelubricated. For extended IGNITOR bearing life, relubricate at least once every two years with a lithium base grease, such as Alvania 3 (Shell Oil), SPARK GAP SHOULD BE Chevron BRB2 (Standard Oil) or Regal AFB2 (Texas Oil). 1/8”...
  • Page 143 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) 13/16” 3/8” (21mm) (10mm) BURNER BOX FIGURE 41 5- Return combustion air inducer motor and vent HEAT EXCHANGER ASSEMBLY connector to original location and secure with retained screws.
  • Page 144 F-Evaporator Coil WARNING Inspect and clean coil at beginning of each cooling season. Clean using mild detergent or commercial coil Product contains fiberglass wool. cleaner. Flush coil and condensate drain with water Disturbing the insulation in this product during taking care not to get insulation, filters and return air installation, maintenance, or repair will expose you ducts wet.
  • Page 145 INSTALLATION Litho U.S.A. INSTRUCTIONS E2015 WARNING LGH420, 480, 540, 600 Improper installation, adjustment, alteration, service LCH420, 480, 540, 600 or maintenance can cause property damage, personal injury or loss of life. Installation and service must be (35, 40, 45, & 50 Ton) performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier GAS AND COOLING PACKAGED UNITS...
  • Page 146 LGH/LCH 420, 480, 540, 600 Unit Dimensions Vertical Airflow - Inches (mm) - Gas Heat Shown Optional Barometric Relief Hoods (one or two, each side). NOTE - If only one hood is used it is located on this side of unit. 36-3/4 104-3/4 See Electrical...
  • Page 147 LGH/LCH420, 480, 540, 600 Unit Dimensions Horizontal Airflow - In. (mm) - Gas Heat Shown Optional Outdoor Air See End View for gas Hoods (2) supply inlet detail Return Opening (2286) Return Opening 1-1/2 (38) (all 4 sides of supply air opening) Optional Barometric Relief Hoods...
  • Page 148 Page 4 LGH/LCH420, 480, 540, 600...

  • Page 149: Shipping And Packing List

    Shipping and Packing List Requirements See figure 1 for unit clearances. Package 1 of 1 contains: 1- Assembled unit WARNING Check unit for shipping damage. Receiving party should contact last carrier immediately if shipping damage is found. Electric shock hazard and danger of IMPORTANT - Hot gas reheat units require a specific explosion.

  • Page 150: Duct Connection

    A-Downflow Discharge Application 5- Units require support along all four sides of unit base. Supports must be constructed of steel or suitably Roof Mounting with S1CURB10E-1 treated wood materials. 1- The S1CURB10E-1 roof mounting frame must be installed, flashed and sealed in accordance with the Duct Connection instructions provided with the frame.

  • Page 151: Rigging Unit For Lifting

    HORIZONTAL SUPPLY AIR RIGGING UNIT BACK OF UNIT LIFTING POINT SHOULD BE DIRECTLY ABOVE CENTER OF UNIT CAUTION - Do not HORIZONTAL SUPPLY AIR walk on unit. SECURE FLANGES SHIPPING COVER WITH SCREWS FROM INSIDE OF UNIT INSTALL NARROW SIDE OF FLANGE ON THE INSIDE OF PANEL ALL 8 POINTS MUST BE...
  • Page 152 Power Exhaust Shipping Blocks 2- Remove four shipping blocks and screws beneath the power exhaust assembly frame as shown in figure 7. 1- Open access panels on return end end of unit. See figure 4. ACCESS TO COMPRESSOR HAT SECTION AND INDOOR BLOWER SHIPPING BLOCKS FRONT SIDE OF UNIT SHOWN COMPRESSOR HAT SECTION INDOOR BLOWER...
  • Page 153 POWER EXHAUST SHIPPING BLOCKS Note - Shipping blocks are only present when optional spring mounts are installed. REMOVE SHIPPING BLOCKS AND SCREWS OPTIONAL SPRING MOUNT (TYPICAL) FIGURE 7 Page 9 507232-02 9/2015...

  • Page 154: Reverse Condensate Drains

    Reverse Condensate Drain Pan REMOVE SCREWS SECURING DRIP SHIELD AND DRAIN PAN Unit is shipped from the factory with the condensate drain LONG DRIP facing the front of the unit. Reverse drain pan when needed SHIELD as follows: 1- Remove blower door on front of unit. See figure 8 and FRONT MULLION REMOVE BLOWER DOOR...

  • Page 155: Condensate Drains

    When making piping connections a drip leg should be Condensate Drain installed on vertical pipe runs to serve as a trap for sediment or condensate. A 1/8” N.P.T. plugged tap is Make drain connection to the 1” N.P.T. drain coupling located on gas valve for test gauge connection.

  • Page 156: Flue And Intake Hoods

    PRESSURE TEST GAS LINE INSTALL EXHAUST AND INTAKE HOODS REMOVE AND DISCARD SHIPPING COVERS OVER MANUAL MAIN EXHAUST OPENINGS SHUT-OFF VALVE GAS VALVE FIGURE 14 EXHAUST HOODS CAUTION Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed.

  • Page 157: Electrical Connections

    Electrical Connections 2nd Disconnect Mounting Location Control Box (Dual Power Supply) POWER SUPPLY Do not apply power or close disconnect switch until installation is complete. Refer to start-up directions in Cooling Start-Up section. Refer closely to unit wiring diagram. Refer to unit nameplate for minimum circuit ampacity and maximum fuse size.
  • Page 158 24 VOLT FIELD WIRING IN THERMOSTAT MODE (Unit Controller in default T'Stat System Mode 6.01 Option 0) UNIT CONTROLLER UNIT CONTROLLER HUMIDISTAT SMOKE INPUTS THERMOSTAT 24VAC G W1 W2 Y1 Y2 O 2A2 (2HT/2C) THERMOSTAT NOTE - ON ELECTRO-ME­ CHANICAL THERMOSTATS SET ANTICIPATOR AT 0.1 AMPS.
  • Page 159 Connect both cable shield drain wires to TB1-7 as shown in figure 20. Wire runs over 150 feet (mm): Use a local, isolated 24VAC transformer such as Lennox cat #18M13 (20VA minimum) to supply power to RH sensor as Optional Building Static Pressure Supply Static Pr.

  • Page 160: Vfd Supply Air Blower Start-Up

    manual. In addition, reference tables 2 and 3. Record FIELD WIRING HOT GAS REHEAT UNITS new setpoints in table 4. (Using A Humidity Sensor With More Than 150 Ft. Wire Runs) 6- The Unit Controller is factory-set to shut the unit off if CONNECTED ISOLATED 24V duct pressure exceeds 2.0”w.c.

  • Page 161: Blower Operation And Adjustments

    BLOWER ASSEMBLY UPPER ADJUSTMENT LOCKWASHER LOWER ADJUSTMENT TO LOOSEN BELT TO TIGHTEN BELT Turn upper nut on both ad­ Turn lower nuts on both justment bolts counter­ adjustment bolts clock­ clockwise. Secure support wise. Secure support plate with lower nuts. plate with upper nuts.
  • Page 162 B-Check Belt Tension 12 lbs. for 10 & 15 HP applications 11 lbs. for 20, 25, & 30 HP applications Overtensioning belts shortens belt and bearing life. Check force below these values indicates belt tension as follows: undertensioned belt. A force above these values 1-Measure span length X.
  • Page 163 discharge applications. Use Page 27 when installing 7-Variable Air Volume Supply Air Blowers - units with any of the optional accessories listed. In addition to adjusting the motor pulley, the supply CFM can be adjusted at the Unit Controller or by using 6- The blower RPM can be adjusted at the motor pulley.
  • Page 164 BLOWER DATA BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE Add factory installed options air resistance, then determine from blower table blower motor output and drive kit required. See page 26 for horizontal configured unit air resistance. See page 27 for factory installed options air resistance data.
  • Page 165 BLOWER DATA BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE Add factory installed options air resistance, then determine from blower table blower motor output and drive kit required. See page 26 for horizontal configured unit air resistance. See page 27 for factory installed options air resistance data.
  • Page 166 BLOWER DATA POWER EXHAUST FANS 50% HIGH STATIC OPERATION, NO ERW Return Duct Negative Static Pressure - Inches Water Gauge (Pa) Volume RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 4000 410 0.75 465 1.00 520 1.25 575 1.50...
  • Page 167 BLOWER DATA POWER EXHAUST FANS 50% HIGH STATIC OPERATION WITH ERW (BY-PASS DAMPERS CLOSED) Return Duct Negative Static Pressure - Inches Water Gauge (Pa) Volume RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 2500 390 0.35 460 0.50 530 0.70 600 0.90...
  • Page 168 BLOWER DATA POWER EXHAUST FANS 50% HIGH STATIC OPERATION WITH ERW IN ECONOMIZER MODE (BY-PASS DAMPERS OPEN) Return Duct Negative Static Pressure - Inches Water Gauge (Pa) Volume RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 3500 380 0.55 435 0.70 495 0.90 555 1.10...
  • Page 169 BLOWER DATA POWER EXHAUST FANS STANDARD STATIC ( TWO FAN OPERATION) Return Duct Return Duct Air Volume Air Volume Negative Static Pressure Negative Static Pressure Inches Water Gauge Inches Water Gauge 12,100 0.50 5700 0.05 11,600 0.55 5000 0.10 11,150 0.60 4300 0.15...
  • Page 170 BLOWER DATA AIR RESISTANCE HORIZONTAL AIRFLOW APPLICATIONS Standard Static Power Exhaust fans 50% High Static 100% High Static Air Volume Power Exhaust Fans Power Exhaust Fans No Power Exhaust Fans in. w.g. in. w.g. in. w.g. 10,000 10,500 11,000 11,500 12,000 12,500 13,000...
  • Page 171 BLOWER DATA FACTORY INSTALLED OPTIONS AIR RESISTANCE ECONOMIZER RETURN AIR DAMPER WITH ERW Outdoor Air Volume Return Duct Negative Static Pressure 0 in. w.g. With ERW 3250 0.32 0.12 - - - - - - - - - 3500 0.36 0.16 - - - - - -...
  • Page 172 BLOWER DRIVE KITS CONSTANT AIR VOLUME AND VARIABLE FREQUENCY DRIVE KIT SPECIFICATIONS Nominal Maximum Drive Kit RPM Range Number (Adjustable Pulley) 510 - 640 5.75 630 - 760 635 - 770 8.63 750 - 905 670 - 825 11.5 750 - 905 880 - 1050 745 - 900 17.25...
  • Page 173 TABLE 5 CAV AND VAV DRIVE COMPONENT MANUFACTURER'S NUMBERS DRIVE COMPONENTS MOTOR PULLEY BLOWER PULLEY BLOWER BUSHING BELTS OEM Part Drive OEM Part No. Browning No. OEM Part No. Browning No. OEM Part No. Browning No. Browning No. P-8-2237 1VP62 X 1-1/8 78M9001 1B5V160 79M0601...

  • Page 174: Cooling Start-Up

    4- Check voltage at disconnect switch. Voltage must be Cooling Start-Up within range listed on nameplate. If not, consult power IMPORTANT-The crankcase heater must be energized for company and have voltage condition corrected before 24 hours before attempting to start compressor. Set control starting unit.
  • Page 175 REFRIGERANT CIRCUITS - UNITS EQUIPPED WITH CAV SUPPLY AIR BLOWERS EVAPORATOR COILS (FACE SPLIT) CONDENSER COILS COMPRESSORS 1 Refrigerant circuit 1 2 Refrigerant circuit 2 3 Refrigerant circuit 3 4 Refrigerant circuit 4 FIGURE 28 REFRIGERANT CIRCUITS - UNITS EQUIPPED WITH VFD SUPPLY AIR BLOWERS EVAPORATOR COILS (ROW SPLIT)
  • Page 176 D-Refrigerant Charge and Check TABLE 8 LGH/LCH420S - R410A - VFD WARNING-Do not exceed nameplate charge under any condition. Circuit 1 Circuit 2 Circuit 3 Circuit 4 Outdoor Coil En­ Dis. Suc. Dis. Suc. Dis. Suc. Dis. Suc. This unit is factory charged and should require no further tering Air adjustment.
  • Page 177 TABLE 13 TABLE 18 LGH/LCH480H - R410A - CAV LGH/LCH600S - R410A - VFD Circuit 1 Circuit 2 Circuit 3 Circuit 4 Circuit 1 Circuit 2 Circuit 3 Circuit 4 Outdoor Outdoor Coil En­ Coil En­ tering Air tering Air Temp psig psig...
  • Page 178 F-Compressor Controls CONDENSER FANS 1- High Pressure Switch (S4, S7, S28, S96) CONDENSER COMPRESSORS The compressor circuit is protected by a high pressure FANS switch which opens at 640 psig + 10 psig (4413 kPa + 70 kPa) and automatically resets at 475 psig + 20 psig (3275kPa + 138 kPa).

  • Page 179: Gas Heatstart-Up

    This unit is equipped with an automatic spark ignition system. Gas Heat Start-Up There is no pilot. In case of a safety shutdown, move FOR YOUR SAFETY READ BEFORE LIGHTING thermostat switch to OFF and return the thermostat switch to HEAT to reset ignition control.

  • Page 180: Gas Heat Operation And Adjustment

    5- Turn gas valve switch to OFF. See figure 31. On 3- Spark ignitor energizes and gas solenoid valve opens. Honeywell VR8305Q gas valves, turn the knob on the 4- Spark ignites gas, ignition sensor proves the flame and gas valve clockwise to “OFF”.

  • Page 181: Supply Air Variable Frequency Drive

    SUPPLY AIR VARIABLE FREQUENCY DRIVE PRESSURE TRANSDUCER WIRING UNIT CONTROLLER TWISTED TB18 PAIR SUPPLY AIR VFD (A96) OUTDOOR DRAIN SECTION CONNECTED TWISTED PAIR CONNECTED OPTIONAL TB24 UNUSED WIRE VIEW SHOWN FROM FRONT FIGURE 34 SIDE OF UNIT Excessive Duct Static FIGURE 33 The Unit Controller will lock-out the unit for 5 minutes if supply duct static pressure exceeds 2.0”w.c.

  • Page 182: Economizer Start-Up

    Requirements for Space Conditioning Systems of the Economizer Start-Up 2013 Building Energy Efficiency Standards. The economizer is controlled by the Unit Controller which is Note - Values in the referenced standard will supersede located in the control box; see Parts Arrangement in the values listed in table 21.
  • Page 183 RT6 SENSOR DISCHARGE AIR SENSOR FIGURE 38 TABLE 20 ECONOMIZER MODES AND SETPOINT Free Free Field- ° Permitted Dampers will modulate to 55 F discharge air (RT6) when outdoor Cooling Cooling Provided Inputs air is suitable: Mode Setpoint Sensors Outdoor air temperature (RT17) is less than return air temperature (RT16) by at °...

  • Page 184: Power Exhaust

    open at approximately 73°F. If the space temperature is too 4- Adjust the minimum % open damper position (see previous section). warm, change the ODE STPT to “13.6” and the Unit Controller will allow dampers to modulate open at 5- Read the static pressure drop across the ERW and approximately 70°F.
  • Page 185 Optional Power Exhaust POWER EXHAUST VARIABLE FREQUENCY DRIVE General VIEW SHOWN FROM BACK Unit may contain one or two power exhaust fans or SIDE OF UNIT blowers. Exhaust blowers are shown in figure 40. Exhaust fans are located in the same place and discharge air in the same direction.
  • Page 186 1- Connect field-provided 1/4” tubing to the (+) port on the Optional Outdoor Air Dampers transducer. Route tubing through unit return air opening to a return air grille in the ductwork. Unit may contain optional outdoor air dampers which provide fresh outdoor air. Dampers are either motorized or 2- Locate the outdoor air kit shipped in a box in the unit manually set.

  • Page 187: Outdoor Air Hoods

    SECURE HOODS TO UNIT SECURE BOTH SIDES OF EACH BAROMETRIC HORIZONTAL HOOD RELIEF DAMPER DISCHARGE UNIT HOODS (1 OR 2 INTAKE HOODS REQUIRED) VERTICAL DISCHARGE UNIT INTAKE HOODS BAROMETRIC RELIEF DAMPER HOODS (1 OR 2 REQUIRED) SIDE VIEW UNIT UNIT FLANGE HOOD SECURE...

  • Page 188: Hot Gas Reheat

    A91 Humidity Sensor Optional Hot Gas Reheat Relative humidity should correspond to the sensor (A91) General output voltage listed in table 25. For example: if indoor air Hot gas reheat units provide a dehumidifying mode of relative humidity is 80% + 3%, the humidity sensor output operation.
  • Page 189 Check-Out IMPORTANT - Free cooling does not operate during reheat. Free cooling will operate as shown in the Unit Test hot gas reheat operation using the following Controller manual. procedure. Reheat will operate as shown in table 26. 1- Make sure reheat is wired as shown in wiring section. Units are shipped from the factory to provide two stages of 2-Make sure unit is in local thermostat mode.
  • Page 190 TABLE 26 REHEAT OPERATION Two-Stage Thermostat - Default Operation T'stat and Humidity Demands Compressors Reheat Only Compressor 1 & 2 Reheat Compressor 1 & 2 Reheat and Reheat & Y1 Compressor 3 & 4 Cooling Reheat &Y1 & Y2 Compressor 1, 2, 3 & 4 Cooling Three-Stage Thermostat (Transfer relay required) Operation T'stat and Humidity Demands...
  • Page 191 MODULATING GAS VALVE (MGV) TO RIGHT HEAT SECTION RIGHT HEAT SECTION MODULATING TO LEFT HEAT GAS VALVE SECTION MANIFOLD PRESSURE PORT LEFT HEAT SECTION MODULATING RIGHT HEAT GAS VALVE SECTION GAS VALVE LEFT HEAT SECTION GAS VALVE MANIFOLD PRESSURE INLET PORT FIGURE 48 4- Use the options in the Unit Controller Service Test...
  • Page 192 when the suction pressure drops below 105 psig (R410A). Optional Hot Gas Bypass (HGB) The de-superheating TXV routes cooler gas from the liquid Hot gas bypass is a factory-installed option only. The HGB line to the suction line. This prevents high refrigerant valve routes refrigerant from the discharge line to the temperatures in the compressor.

  • Page 193: Outdoor Air Cfm Control

    3- Adjust the minimum % open damper position until the Optional Outdoor Air CFM Control air flow hood reads the design minimum outdoor air CFM. See figure 36. Outdoor air CFM Control is a factory-installed option available on units equipped with a supply air variable NOTE - Refer to local codes or authorities having frequency drive (VFD) and economizer.
  • Page 194 Set Velocity Setpoint VELOCITY SENSOR (A24) RANGE 1- Measure DC voltage between TB22-6 and TB22-10. 0-5m/s 0-7.5m/s 0-10m/s (0-984ft/min.) (0-1476ft/min.) (0-1968ft/min.) 2- Multiply DC voltage by 25.4 to obtain the sensor voltage. Factory 3- Round the result to the nearest whole number. Enter Setting the result in Unit Controller ECTO 9.02.

  • Page 195: Energy Recovery Wheels

    Note - When the outdoor air temperature is between 65°F Optional Energy Recovery Wheel and 40°F, DL43 will energize the ERW for one minute every Unit may contain an optional energy recovery wheel. The ten minutes to clean the wheel. ERW is located in the outdoor air entering and exhaust air By-pass dampers will close as outdoor air dampers close or streams.

  • Page 196: Service

    Service ORIENT REPLACEMENT FILTERS IMPORTANT Mineral oils are not compatible with R410A. If oil must be added, it must be a polyol ester oil. CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dan­ gerous operation.
  • Page 197 D-Combustion Air Inducer (Gas Units) WARNING A combustion air proving switch checks combustion air inducer operation before allowing power to the gas The State of California has determined that this prod­ controller. Gas controller will not operate if inducer is uct may contain or produce a chemical or chemcials, in very low doses, which may cause serious illness or obstructed.
  • Page 198 2- Disconnect pressure switch air tubing from combustion 2- Remove flue box cover. Clean with a wire brush as air inducer port. required. 3- Reassemble the unit. The flue box cover gasket and 3- Remove and retain screws securing combustion air combustion air inducer gasket should also be replaced inducer to flue box.

This manual is also suitable for:

Lgh036Lgh048Lgh060Lgh072Lch048Lch060 ... Show all

Table of Contents