Lennox LGH Series Unit Information
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Air Conditioner
  5. LGH Series
  6. Unit information

Lennox LGH Series Unit Information

Hide thumbs Also See for LGH Series:

Advertisement

Table of Contents

S e r v i c e L i t e r a t u r e
The LGH156H, 180H, 180U, 210H, 240H, 240U, 300S
and 300U. (LGH156H/300S) units are configure to order
units (CTO) with a wide selection of factory installed op-
tions.
LGH156H is available in 260,000 Btuh or 360,000 Btuh
(76.2 or 105.5 kW) and has the option for single stage
heat in 169,000 Btuh (49.5 kW).
LGH180H, 180U, 210H, 240H, 240U, 300S and 300U
units are available in 260,000, 360,000 or 480,00 Btuh
(76.2, 105.5 or 140.7 kW) heating inputs.
The LGH180H/U and 210H also has an optional single
stage heat in 169,000 Btuh (49.5 kW).
Gas heat sections are designed with aluminized steel tube
heat exchangers with stainless steel as an option.
Cooling capacities range from 13 to 25 tons (45.7 to 88
kW). LGH156H, 180H, and 210H utilize three compres-
sors while LGH180U, 240H, 240U, 300S and 300U utilize
four compressors.
Units are designed for R410A refrigerant. See unit name-
plate. Operating pressures and pressure switch settings
are significantly higher than R22 charged units. Service
equipment must be rated for R410A.
Multi-Stage Air Volume MSAV
The VFD-driven blower will operate at lower speeds when
demand is low and increase to higher speeds when de-
mand is high.
Variable speed VAV system is available as an option which
enables supply duct static measurement to control blow-
er CFM and discharge air temperature to control cooling
stages.
All LGH units are designed to accept any of several differ-
ent energy management thermostat control systems with
minimum field wiring. Factory- or field-provided control op-
tions connect to the unit through Smartwire connectors.
When "plugged in" the controls become an integral part of
the unit wiring.
Information contained in this manual is intended for use
by qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching
four cables to the holes located in the unit base rail (two
holes at each corner). Refer to the installation instructions
for the proper rigging technique.
UNIT INFORMATION
UNIT INFORMATION
Copr 1013-L2
Revised 05/2020
LGH156H through 300U
blower option is available.
®
To prevent serious injury or death:
1- Lock-out/tag-out before performing maintenance.
2- If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove
fan belt where applicable, and ensure all
controllers and thermostats are set to the "OFF"
position before performing maintenance.
3- Always keep hands, hair, clothing, jewelry, tools,
etc., away from moving parts.
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
Improper
installation,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a qualified installer or service
agency.
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
Options / Accessories . . . . . . . . . . . . . . . . . . . . . Page 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
I-Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 23
II-Placement and Installation . . . . . . . . . . . . . . . Page 46
III-Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
IV-Start Up - Operation . . . . . . . . . . . . . . . . . . . . Page 79
V-System Service Checks . . . . . . . . . . . . . . . . . Page 83
VI-Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . Page 86
VII-Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . Page 87
Page 1
LGH SERIES
13 to 25 ton
45.7 to 88 kW
WARNING
CAUTION
WARNING
adjustment,
WARNING

Table of Contents

alteration,

Advertisement

Table of Contents
loading

Related Manuals for Lennox LGH Series

Summary of Contents for Lennox LGH Series

  • Page 1: Table Of Contents

    LGH SERIES UNIT INFORMATION UNIT INFORMATION 13 to 25 ton 45.7 to 88 kW Copr 1013-L2 S e r v i c e L i t e r a t u r e Revised 05/2020 LGH156H through 300U The LGH156H, 180H, 180U, 210H, 240H, 240U, 300S WARNING and 300U.

  • Page 2: Options / Accessories

    VIII-Hot Gas Re-Heat ..... Page 91 OPT IONS / A C C ESSORIES IX-Staged Blower ......Page 95 Unit Model No Catalog Item Description...
  • Page 3 OPT IONS / A C C ESSORIES Unit Model No Catalog Item Description Number 156 180 210 240 300 CONTROLS Blower Proving Switch 21Z10 Commercial Prodigy Control System - BACnet Module 59W51 ® ® Controls Prodigy Control System - LonTalk Module 54W27 ®...
  • Page 4 OPT IONS / A C C ESSORIES Unit Model No Catalog Item Description Number 156 180 210 240 300 ECONOMIZER High Performance Economizer (Approved for California Title 24 Building Standards AMCA Class 1A Certified) High Performance Economizer 22J18 Downflow or Horizontal Applications - Includes Outdoor Air Hood. Order Downflow or Horizontal Barometric Relief Dampers separately.
  • Page 5 OPT IONS / A C C ESSORIES Unit Model No Catalog Item Description Number 156 180 210 240 300 ROOF CURBS Hybrid Roof Curbs, Downflow 8 in. height 11F58 14 in. height 11F59 18 in. height 11F60 24 in. height 11F61 Adjustable Pitch Curb 14 in.
  • Page 6 OPTIONS / ACCESSORIES Unit Model No. Model Catalog Item Description Number Number 180U 240U 300U COOLING SYSTEM Condensate Drain Trap PVC - C1TRAP20AD2 76W26 Copper - C1TRAP10AD2 76W27 Corrosion Protection Factory E1SNSR71AD1 68W88 Refrigerant Type R-410A HEATING SYSTEM Bottom Gas Piping Kit C1GPKT01C-1 85M31 Combustion Air Intake Extensions (order two)
  • Page 7 OPTIONS / ACCESSORIES Unit Model No. Model Catalog Item Description Number Number 180U 240U 300U INDOOR AIR QUALITY Air Filters Healthy Climate MERV 8 - C1FLTR15C-1- 54W67 ® 24 x 24 x 2 (Order 6 per unit) MERV 13 - C1FLTR40C-1- 52W40 Replacement Media Filter With Metal Mesh C1FLTR30C-1-...
  • Page 8 OPTIONS / ACCESSORIES Unit Model No. Model Catalog Item Description Number Number 180U 240U 300U OUTDOOR AIR Outdoor Air Dampers With Outdoor Air Hood Motorized C1DAMP20C-1 13U04 Manual C1DAMP10C-2 13U05 POWER EXHAUST Standard Static 208/230V - C1PWRE11C-1Y 75W90 460V - C1PWRE11C-1G 75W91 575V - C1PWRE11C-1J 75W92...

  • Page 9: Specifications

    S P EC IFIC ATIONS General Data Nominal Tonnage 13 Ton 13 Ton 13 Ton Model Number LGH156H4B LGH156H4V LGH156H4M Efficiency Type High High High Blower Type MSAV ® (Constant Air Volume) (Variable Air Volume) (Multi-Stage Air Volume) Cooling Gross Cooling Capacity - Btuh 154,000 152,000 154,000...
  • Page 10 S PECIF ICATION S General Data Nominal Tonnage 15 Ton 15 Ton 15 Ton 17.5 Ton 17.5 Ton Model Number LGH180H4B LGH180H4V LGH180H4M LGH210H4B LGH210H4M Efficiency Type High High High High High MSAV Blower Type MSAV ® ® (Constant Air (Variable Air (Multi-Stage Air (Constant Air...
  • Page 11 SP ECIF ICATIONS General Data Nominal Tonnage 20 Ton 20 Ton 20 Ton Model Number LGH240H4B LGH240H4V LGH240H4M Efficiency Type High High High Blower Type MSAV ® (Constant Air Volume) (Variable Air Volume) (Multi-Stage Air Volume) Cooling Gross Cooling Capacity - Btuh 238,000 238,000 238,000...
  • Page 12 SP ECIF ICATIONS General Data Nominal Tonnage 25 Ton 25 Ton Model Number LGH300S4B LGH300S4M Efficiency Type Standard Standard Blower Type MSAV® (Constant Air Volume) (Multi-Stage Air Volume) Cooling Gross Cooling Capacity - Btuh 281,000 281,000 Net Cooling Capacity - Btuh 270,000 270,000 Performance...
  • Page 13 SPECIFICATIONS General Data Nominal Tonnage 15 Ton Model Number LGH180U4M Ultra MSAV (Multi-Stage Air Volume) (Multi-Stage Air Volume) Cooling Performance Refrigerant Type R-410A Circuit 1 Circuit 2 Gas Heating Options Available Compressor Type (number) Tandem Scroll (4) Tandem Scroll (4) Tandem Scroll (4) Outdoor Coils Outdoor Coil...
  • Page 14 SP ECIF ICATIONS - GAS H EAT Usage Data Model Number LGH156 LGH156 LGH180 LGH180 LGH180 LGH210 LGH210 LGH210 LGH240 LGH240 LGH300 LGH300 Heat Input Type Low (L) Standard (S) Medium (M) High (H) Number of Gas Heat Stages Gas Heating Input - Btuh First Stage 169,000...
  • Page 15 Page 15...

  • Page 16: Blower Data

    BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Efficiency Nominal Maximum 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 3.45 685 - 856...
  • Page 17 BLOWER D ATA POWER EXHAUST FAN PERFORMANCE Return Air System Static Pressure Air Volume Exhausted in. w.g. 0.00 8630 0.05 8210 0.10 7725 0.15 7110 0.20 6470 0.25 5790 0.30 5060 0.35 4300 0.40 3510 0.45 2690 0.50 1840 CEILING DIFFUSER AIR RESISTANCE - in. w.g. Step-Down Diffuser Flush Diffuser RTD11-185S...

  • Page 18: Electrical Data

    ELECT RICA L DATA 1 3 TO N 13 TON HIGH EFFICIENCY LGH156H4 Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 14.5 Locked Rotor Amps Compressor 2 Rated Load Amps 14.5 Locked Rotor Amps Compressor 3...
  • Page 19 ELECTRIC AL DATA 17 .5 TO N 17.5 TON HIGH EFFICIENCY LGH210H4 Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 15.6 Locked Rotor Amps 38.9 Compressor 2 Rated Load Amps 15.6 Locked Rotor Amps 38.9...
  • Page 20 ELECT RICAL DATA 25 TO N 25 TON STANDARD EFFICIENCY LGH300S4 Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 19.6 Locked Rotor Amps 66.1 55.3 Compressor 2 Rated Load Amps 19.6 Locked Rotor Amps 66.1...
  • Page 21 ELECTRICAL DATA 15 TON ULTRA HIGH EFFICIENCY (R-410A) Voltage - 60hz Compressor 1 Rated Load Amps Locked Rotor Amps Compressor 2 Rated Load Amps Locked Rotor Amps Compressor 3 Rated Load Amps Locked Rotor Amps Compressor 4 Rated Load Amps Locked Rotor Amps Outdoor Fan Full Load Amps...
  • Page 22 ELECTRICAL DATA 25 TON 25 TON ULTRA HIGH EFFICIENCY (R-410A) LGH300U4M Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 19.6 Locked Rotor Amps 66.1 55.3 Compressor 2 Rated Load Amps 19.6 Locked Rotor Amps 66.1...

  • Page 23: I-Unit Components

    PARTS ARRANGEMENT CONDENSER FANS (LGH180H SHOWN) (3 FANS ON 156 UNITS; 6 EVAPORATOR FANS ON 180U, 210, 240H/U, FILTERS ECONOMIZER COIL & 300S/U UNITS (SIX - 24 X 24 X 2”) DAMPERS (OPTIONAL) BLOWERS UNIT CONTROLLER INVERTER (OPTIONAL) CONDENSER COILS CONDENSATE DRAIN OUTDOOR FAN CAPACITORS...
  • Page 24 FIGURE 3 Page 24...
  • Page 25 FIGURE 4 Page 25...
  • Page 26 4-C. A. I. Transformers T3, T13 (575V units) In 180H units, K10 energizes fan 1 B4, K68 energizes fan 2 B5, K149 energizes fan 3 B21 and K150 energizes fan 4 All 575 (J) voltage units use transformer T3 and T13. The B22.
  • Page 27 14-Burner Controls A3 & A12 The amount of airflow for each stage is preset from the factory. Airflow can be adjusted by changing ECTO pa- Units have two burner controls. A3 controls gas heat sec- rameters in the A55 Unit Controller. The VFD is located tion one and A12 controls gas heat section two.
  • Page 28 Room Sensors Room sensor (A2) is a two-wire thermistor with 1k series resistor. TABLE 2 Two-Wire Thermistor Temp. °F (°C) Resistance +/-2% Temperature °F (°C) Resistance +/-2% Temp. °F (°C) Resistance +/-2% 40 (4.4) 27,102 60 (15.6) 16,313 80 (26.7) 10,299 45 (7.2) 23,764...
  • Page 29 22-VFD Controller (GP board) A133 (Staged- Blower 24-Outdoor Fan Transformers T5, T59 (460V & 575V units) units) The GP board A133 controls and monitors the status of All 460 (G) and 575 (J) voltage 180U, 240U and 300U the VFD A96. The board sends the signal to start the VFD units use transformer T5 and T59.
  • Page 30 SIEMENS OVERLOAD RELAY BLUE RESET BUTTON IN FACTORY SET AUTO MODE (Turn clockwise to H for manual reset) GREEN TRIP INDICATOR (Flush with surface -- not tripped; Above surface -- tripped) RED TEST BUTTON AMP ADJUSTMENT DIAL Adjust relay amp setting according to value given on the blower motor nameplate. Proper relay amp setting equals motor nameplate FLA X service factor of 1.15 X .95.
  • Page 31 156H, 180H, 210H PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL 156 VAV, 180 VAV ONLY EVAPORATOR COIL (not to scale) (B1) STG 1 (B2) STG 1 (B13) STG 2 DRIERS (3) STAGE 1 CIRCUIT 1 STAGE 2 (S87) CIRCUIT 1 & 2 INTERTWINED (S88) (S7)
  • Page 32 240H, 300S, 300U PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL 240 VAV ONLY EVAPORATOR COIL (not to scale) (B1) STG 1 (B2) STG 1 (B13) STG 2 (B20) STG 2 DRIERS (4) STAGE 4 CIRCUITS 1, 2, 3, & 4 INTERTWINED STAGE 1 (S87) CIRCUIT 1...
  • Page 33 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 - COMPRESSOR 1 AND 2...
  • Page 34 If Interlink compressor replacement is necessary, call at low outdoor temperatures. All units are equipped with 1-800-4-LENNOX (1-800-453-6669). this switch. In all models a switch is located in each liquid line prior to the indoor coil section.
  • Page 35 In LGH180H/210 units, S11 (compressor one) is wired to 6-Service Valve (optional) the Unit Controller (A55) and S84 (compressor two) and Units may be equipped with service valves located in the S85 (compressor three) are wired in parallel to the Unit discharge and liquid lines.
  • Page 36 11-High Temperature Limit Switch S5, S8, S31 &S180 2 - With all access panels in place, measure static pressure external to unit (from supply to return). (180U, 240U & 300U) Blower performance data is based on static pressure These high temperature limit switches are N.C and wired readings taken in locations shown in figure 11.
  • Page 37 Blower Operation Determining Unit Air Volume NOTE-The following is a generalized procedure and does IMPORTANT - Staged-Blower units are factory-set to run not apply to all thermostat control systems. the blower at full speed when there is a blower (G) de- mand without a heating or cooling demand.
  • Page 38 LOCATION OF STATIC PRESSURE READINGS INSTALLATIONS WITH DUCTWORK INSTALLATIONS WITH CEILING DIFFUSERS ROOFTOP UNIT ROOFTOP UNIT RETURN AIR READING LOCATION RETURN AIR READING LOCATION SUPPLY SUPPLY TURN TURN FIRST BRANCH OFF OF MAIN RUN MAIN DUCT RUN SUPPLY AIR SUPPLY AIR READING READING DIFFUSER...
  • Page 39 PULLEY ALIGNMENT - WITH TENSIONER FIXED PULLEY ADJUSTABLE PULLEY TENSIONER BOLT AND TENSIONER ADJUSTMENT NUT BOLT ALIGN TENSIONER MARKS FIGURE 14 Check Belt Tension MEASURE BELT TENSION Overtensioning belts shortens belt and bearing life. Check belt tension as follows: 1 - Measure span length X. See figure 15. 2 - Apply perpendicular force to center of span (X) with enough pressure to deflect belt 1/64”...
  • Page 40 TABLE 6 DRIVE COMPONENTS ADJUSTABLE SHEAVE FIXED SHEAVE Drive H.P. Supplier No. Supplier No. OEM Part No. Part No. 2 & 3 Std. 1VP40x7/8 79J0301 BK95 x 1-7/16 80K1601 2 & 3 Std. 1VP40x7/8 79J0301 BK72 x 1 7/16 100244-13 3 High &...
  • Page 41 D-GAS HEAT COMPONENTS The ignition control provides three main functions: gas valve control, ignition and flame sensing. The unit will See SPECIFICATIONS tables or unit nameplate for Btuh usually ignite on the first attempt; however, the ignition capacities. Units are equipped with two identical gas heat attempt sequence provides three trials for ignition before sections (gas heat section one and gas heat section two).
  • Page 42 NORMAL IGNITION SEQUENCE - TIMINGS NOMINAL ON / CLOSED OFF / OPEN END OF DEMAND THERMOSTAT DEMAND COMBUSTION AIR BLOWER COMBUSTION AIR PROVE SWITCH GAS VALVE IGNITION SPARK BLOWER IGNITION TRIAL FIGURE 16 RETRIALS - IGNITION ATTEMPT SEQUENCE - TIMINGS NOMINAL SECONDS 0 30 35 100 105...
  • Page 43 2-Heat Exchanger (Figure 19) the combustion air blower, exhaust gases are drawn out the top and fresh air/gas mixture is drawn in at the bottom. Units use aluminized steel inshot burners with matching Heat is transferred to the air stream from all surfaces of tubular aluminized (stainless steel is an option) steel heat the heat exchanger tubes.
  • Page 44 Each orifice and burner are sized specifically to the unit. All units use inshot burners (see figures 20 and 21). Burn- Refer to Lennox Repair Parts Listing for correct sizing ers are factory set and do not require adjustment. A peep information.4-Primary High Temperature Limits S10 &...
  • Page 45 5-Flame Rollout Limits S47, S69 8-Combustion Air Motor Capacitors C3 & C11 Flame rollout limits S47 on first heat section and S69 on The combustion air blower motors in all LGH units require second heat section are SPST N.C. high temperature run capacitors.

  • Page 46: Ii-Placement And Installation

    10-Spark Electrodes III-CHARGING An electrode assembly is used for ignition spark. Two WARNING identical electrodes are used (one for each gas heat sec- tion). The electrode is mounted through holes on the left Refrigerant can be harmful if it is inhaled. Refrigerant -most end of the burner support.
  • Page 47 TABLE 11 LGH/LCH156H 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 48 TABLE 13 LGH/LCH156H VAV 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)
  • Page 49 TABLE 14 LGH/LCH180H CAV/STAGED 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)
  • Page 50 TABLE 16 LGH/LCH180H VAV 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)
  • Page 51 TABLE 18 LGH/LCH210H REHEAT 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)
  • Page 52 TABLE 20 LGH/LCH240H CAV/STAGED REHEAT 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...
  • Page 53 TABLE 22 LGH/LCH300S 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 54 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 54...
  • Page 55 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 55...
  • Page 56 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 56...
  • Page 57 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 57...
  • Page 58 LGH/LCH156 VAV CHARGING CURVE CIRCUIT 3 - 580950-01 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 58 Page 58...
  • Page 59 LGH/LCH180 CAV/STAGED CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 CAV/STAGED CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 59...
  • Page 60 LGH/LCH180 CAV/STAGED CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 60 Page 60...
  • Page 61 LGH/LCH180 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 61...
  • Page 62 LGH/LCH180 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 VAV CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 62...
  • Page 63 LGH/LCH180 VAV CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH180 VAV CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 63...
  • Page 64 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 64...
  • Page 65 LGH/LCH210 CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH210 REHEAT CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 65...
  • Page 66 LGH/LCH210 REHEAT CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH210 REHEAT CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 66...
  • Page 67 LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 67...
  • Page 68 LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psi LGH/LCH240 CAV/STAGED CHARGING CURVES CIRCUIT 4 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 68...
  • Page 69 LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 69...
  • Page 70 LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 CAV/STAGED REHEAT CHARGING CURVES CIRCUIT 4 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 70...
  • Page 71 LGH/LCH240 VAV CHARGING CURVES CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 VAV CHARGING CURVES CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 71...
  • Page 72 LGH/LCH240 VAV CHARGING CURVES CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH240 VAV CHARGING CURVES CIRCUIT 4 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 72...
  • Page 73 LGH/LCH300S CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° LGH/LCH300S CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 73...
  • Page 74 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 74...
  • Page 75 LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 1 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 2 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 75...
  • Page 76 LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 3 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) LGH/LCH300S REHEAT CHARGING CURVE CIRCUIT 4 Outdoor Temperature (°F) 115° 105° 95° 85° 75° 65° Suction Pressure (psig) Page 76...
  • Page 77 B-Fin/Tube Coil TABLE 25 WARNING-Do not exceed nameplate charge under LG/LC Series 156H Reheat any condition. Outdoor Circuit 1 Circuit 2 Circuit 3 This unit is factory charged and should require no fur- Coil En- Dis. Suc. Dis. Suc. Dis. Suc.
  • Page 78 TABLE 29 - LG/LCSeries 210H Std. TABLE 33 Outdoor Circuit 1 Circuit 2 Circuit 3 LG/LC Series 240U Coil En- Dis. Suc. +5 Dis. Suc. Dis. Suc. Outdoor Circuit 1 Circuit 2 tering Air psig Coil En- Dis. +10 Suc. +5 Dis.

  • Page 79: Iv-Startup - Operation

    C-Charge Verification - Approach Method AHRI Test- A-Preliminary and Seasonal Checks ing (Fin/Tube Coil) 1 - Make sure the unit is installed in accordance with the installation instructions and applicable codes. 1 - Using the same thermometer, compare liquid 2 - Inspect all electrical wiring, both field and factory temperature to outdoor ambient temperature.
  • Page 80 156, 180H, & 210 REFRIGERANT CIRCUITS 156, 180 VAV ONLY STAGE 1 EVAPORATOR COIL EVAPORATOR CONDENSER STAGE 2 COIL (not to scale) COILS EVAPORATOR COIL STAGE 1 STAGE 1 EVAPORATOR CIRCUIT 1 COIL STAGE 2 CIRCUIT 1 & 2 INTERTWINED STAGE 2 STAGE 3 CONDENSER...
  • Page 81 REFRIGERANT CIRCUITS - 180U, 240U, 300U 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 82 C-Heating Startup GAS VALVE FOR YOUR SAFETY READ BEFORE LIGHTING HIGH FIRE LOW FIRE WARNING ADJUSTMENT ADJUSTMENT MANIFOLD PRESSURE Danger of explosion. Can cause injury or product or property damage. If 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 83: V-System Service Checks

    The use of specialty Gas Leak Detector is strongly recom- or power failure. The manual shut-off knob can be used to mended. It is available through Lennox under part number immediately shut off gas supply. 31B2001. See CORP 8411-L10, for further details.
  • Page 84 IMPORTANT TYPICAL GAS BURNER ASSEMBLY BURNER Disconnect heating demand as soon as an accurate SUPPORT CAP reading has been obtained. BURNERS Combustion gases Flue products must be analyzed and compared to the unit specifications. Problems detected during the inspection may make it necessary to temporarily shut down the fur- nace until the items can be repaired or replaced.
  • Page 85 4-17 to add oil to the tandem compressor Nominal Signal system( POE 32-3MAF oil recommended). The A/C Manufacturer Drop Out Microamps Re-New Injector kit, part number 4057-99, Lennox catalogue number Y6630 is recommended for use UTEC 0.5 - 1.0 0.09 when adding oil to a system.

  • Page 86: Vi-Maintenance

    Circuit 1 Oil Equalization Port Circuit 2 Oil Equalization Port (not shown, behind compressor 4) Circuit 1 Oil Discharge Port Circuit 2 Oil Discharge Port FIGURE 31 14 - Allow the unit to continue to run in full load for a B-Lubrication minimum of 5 minutes to allow the new oil level All motors and blower wheels used in LGH units are lubri-...

  • Page 87: Vii-Accessories

    It should be sprayed with Filter Handicoater when dry prior to reinstallation. Filter Handicoater is R.P. Products coat- ing no. 418 and is available as Lennox Part No. P-8-5069. FIGURE 32 Page 87...
  • Page 88 NOTE - Gravity exhaust dampers are required with power C1DAMP10 MANUAL OUTDOOR AIR DAMPER exhaust. The economizer is controlled by the A55 Unit Controller. The economizer will operate in one of four modes. Each mode requires a different A55 Unit Controller DIP switch setting.
  • Page 89 The kit includes the following parts: LGH series units. An exhaust hood is furnished with the 1 - The strip heater (HR6) is located as close as gravity exhaust damper.
  • Page 90 I-Control Systems N-Indoor Air Quality (CO2) Sensor A63 The A55 Unit Controller provides all control function for The indoor air quality sensor monitors CO2 levels and the rooftop unit. Default operation requires a standard reports the levels to the A55 Unit Controller. The board room thermostat or direct digital controller (DDC).
  • Page 91 VIII-FACTORY-INSTALLED Hot Gas Re-Heat Reheat will terminate when the indoor relative humidity falls 3% (57% default) or the digital output de-energizes. General The reheat deadband can be adjusted at Settings - Con- Hot Gas Re-Heat units provide a dehumidifying mode of trol menu.
  • Page 92 COOLING MODE REFRIGERANT ROUTING 156, 180H, & 210 UNITS STAGE 2 EVAPORATOR Note: Two refrigerant circuits are shown; both COIL circuits operate when there is a first-stage thermostat demand (default). EXPANSION STAGE 1 VALVES EVAPORATOR COIL CIRCUIT 1 CONDENSER COIL REHEAT COIL CIRCUIT 2...
  • Page 93 COOLING MODE REFRIGERANT ROUTING 240H AND 300S UNITS STAGE 2 Note: Two refrigerant circuits are shown; both EVAPORATOR circuits operate when there is a first-stage COIL thermostat demand (default). EXPANSION VALVES STAGE 1 EVAPORATOR CIRCUIT 2 COIL CONDENSER COIL REHEAT COIL CHECK VALVE...
  • Page 94 TABLE 40 REHEAT OPERATION Two-Stage Thermostat - Default Operation T'stat and Humidity Demands 156, 180, 210 (3-Compressors) 240, 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 95 IX--Staged-Blower C-Enter Design Specifications Into M3 Controller Start-Up Use the following menu to enter the blower design speci- A-Design Specifications fied CFM into the Unit Controller. Make sure blower CFM is within limitations shown in tables 42 and 43. Refer to the Use table 41 to fill in field-provided, design specified blow- Unit Controller manual provided with unit.
  • Page 96 Set Minimum Position 2 Settings / Install / New M2 / Staged-Blower VFD Bypass Caution - Units not equipped with a VFD will be set to Set- Use the same menu in the Unit Controller to set “Min OCP tings / Control / Staged-Blower VFD Bypass / None. The Blwr High”...
  • Page 97 TABLE 42 TABLE 43 MINIMUM AND MAXIMUM CFM MINIMUM AND MAXIMUM CFM - 180U, 240U, 300U Gas Heat Minimum CFM Gas Heat Minimum CFM Unit Gas Heat Size Unit Gas Heat Size Airflow CFM Airflow CFM LGH180U/240U/300U Low, Std., Med. 4500 LGH156-300S Low, Std.
  • Page 98 Operation Y4 Demand - All Compressors On This is a summary of cooling operation. Blower Cooling High Note - During a dehumidification demand the blower op- Dampers Maximum Open erates at the highest speed. Free cooling is locked-out during reheat operation. Refer to reheat start-up and op- Four-Compressor Units: eration section for details.
  • Page 99 C-Zone Sensor (4 Clg. Stages), 4-Compressor Units NOTE - Units equipped a Variable Frequency Drive (VFD) are designed to operate on balanced, three-phase power. 1-Economizer With Outdoor Air Suitable Y1 Demand - Operating units on unbalanced three-phase power will re- Compressors Off duce the reliability of all electrical components in the unit.
  • Page 100 SUPPLY AIR VARIABLE FREQUENCY DRIVE A55 UNIT CONTROLLER P267 DETAIL A P300 SUPPLY AIR J300 FIGURE 41 1 - Turn off all power to unit. Note - The Unit Controller will lock-out the unit for 5 minutes if static pressure exceeds 2.0”w.c. for 20 2 - Locate J/P247 and J/P248 connectors near the seconds.
  • Page 101 SUPPLY AIR VFD BYPASS CONNECTOR SUPPLY AIR VFD BYPASS COMPONENTS Connect Disconnect P247 P247 J249 J247 K203A & B LOCATED IN FIGURE 43 THIS AREA SUPPLY AIR VFD BYPASS CONNECTOR Disconnect P248 Connect P248 Jumper Plug J248 J248 FIGURE 44 FIGURE 42 Page 101...
  • Page 102 XI-Wiring Diagrams and Sequence of Operation LGH156 UNIT DIAGRAM Page 102...
  • Page 103 LGH156 DIAGRAM KEY DESCRIPTION COMPONENT JACK/PLUG DESCRIPTION PANEL, MAIN BOARD LENNOX PANEL, COMP 3 & 4 AND 2ND STAGE HEAT A178 COMPRESSOR 1 COMPRESSOR 2 MOTOR, BLOWER MOTOR, OUTDOOR FAN 1 MOTOR, OUTDOOR FAN 2 MOTOR, EXHAUST FAN 1 MOTOR, EXHAUST FAN 2...
  • Page 104 LGH180 UNIT DIAGRAM Page 104...
  • Page 105 LGH180 KEY DESCRIPTION Page 105...
  • Page 106 LGH210 UNIT DIAGRAM Page 106...
  • Page 107 LGH210 KEY DESCRIPTION Page 107...
  • Page 108 LGH240/300 UNIT DIAGRAM Page 108...
  • Page 109 LGH240/300 KEY DESCRIPTION Page 109...
  • Page 110 Sequence of Operation LGH156/300 10. A55 Unit Controller and A178 Compressor 3 and 4 Controller energize fan contactor K10 (all units), K68 POWER: (all units), K149 (180H-300S only), K150 (180/210H only), K152 (210H only), K153 (210H only) based on 1. Line voltage from TB2, unit disconnect S48, or other low ambient switch S11 and S84 inputs and predefined factory or field installed optional power disconnects, control logic.
  • Page 111 LGH180U/240U/300U UNIT DIAGRAM Page 111...
  • Page 112 LGH180U, 240U, 300U KEY DESCRIPTION Page 112...
  • Page 113 Sequence of Operation LGH180U, 240U, 300U 7. 24VAC is routed to the A55 Unit Controller. After A55 proves N.C. low pressure switch S87, N.C. freezestat POWER: S49, and N.C. high pressure switch S4, high tempera- ture limits S5 and S8, compressor contactors K1 and 1.
  • Page 114 Staged-Blower UNITS - NO BYPASS 24V POWER 0-10 VDC IN P265 J265E J265B K203 J248 J248 P248 P248 SETRA COMPONENT RELAY SENSOR, DUCT STATIC PRESSURE (IDB)PWM 1/VO PANEL, MAIN CONTROL CONTROL, INVERTER (ODF)PWM 3 CONTROL, GENERAL PURPOSE A133 MOTOR, BLOWER (ODF)PWM 2 MOTOR, EXHAUST FAN 1 MOTOR, EXHAUST FAN 2...
  • Page 115 Staged-Blower UNITS - WITH BYPASS KEY COMPONENT PANEL, MAIN CONTROL CONTROL, INVERTER A133 CONTROL, GENERAL PURPOSE K202 MOTOR, BLOWER MOTOR, EXHAUST FAN 1 MOTOR, EXHAUST FAN 2 CAPACITOR, EXHAUST FAN 1 K203 J248 CAPACITOR, EXHAUST FAN 2 FUSE, EXHAUST FAN CONTACTOR, BLOWER RELAY, EXHAUST FAN K202 CONTACTOR, VFD POWER TO MOTOR...
  • Page 116 J265D P265 24V COMMON FROM F10 DESCRIPTION DESCRIPTION CONTROL, BURNER 1 CONTROL, BURNER 2 PANEL, MAIN CONTROL LENNOX P228 P228 J228 1 PANEL, COMP 3 & 4 , 2nd STAGE HEAT− C3 A178 J228 MOTOR COMBUSTION AIR BLOWER 1 J19 1...
  • Page 117 SEQUENCE OPERATION HEAT OPTIONAL LOW AMBIENT KIT LGH156/300 UNITS (C.G.A. -50°C LOW AMBIENT KIT): FIRST STAGE HEAT: 11. When heat section temperature drops below -20°F, 1. Heating demand initiates at W1 in thermostat. S59 opens and de-energized A3 and A12 ignition con- trols.
  • Page 118 OF THE M2 BOARD (A55). REV. 3.0 M2 SETTINGS MUST BE MODIFIED WHEN A42, S42, S52, S135 OR S149 ARE INSTALLED Lennox Commercial POWER: Terminal block P297 on the A55 Unit Controller energizes the thermostat components with 24VAC. OPERATION: al N.O. air flow switch S52 (indicates no air [i.e. broken belt] system shuts down).
  • Page 119 ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT KEY DESCRIPTION PLUG, BLOWER DECK DESCRIPTION P264 PLUG, THERMOSTAT - DDC INTERFACE COMPONENT P297 SENSOR, ELECTRONIC THERMOSTAT PLUG, IAQ INTERFACE P298 MONITOR, PHASE PROTECTOR PLUG, SAFETY INTERFACE P299 PANEL, MAIN PLUG, SYS BUS P304 SENSOR, CO2 (IAQ) OPTIONAL SENSOR, SUPPLY AIR TEMP SENSOR, HUMIDITY SENSOR, RETURN AIR TEMP...
  • Page 120 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...

This manual is also suitable for:

Lgh156hLgh180hLgh210hLgh240hLgh249uLgh300s ... Show all

Table of Contents