Lennox LGH122U4M Manuals

Manuals and User Guides for Lennox LGH122U4M. We have 2 Lennox LGH122U4M manuals available for free PDF download: Unit Information

Lennox LGH122U4M Unit Information

Lennox LGH122U4M Unit Information (87 pages)

Brand: Lennox | Category: Air Handlers | Size: 7.81 MB

Table of Contents

Table of Contents
1
Options / Accessories
2
Specifications
8
Blower Tables
14
Electrical Data
19
- Parts Arrangement Diagrams
  25
- Outdoor Fan Capacitors
  28
- Compressor Contactor
  28
- Control Box Components
  28
I-Unit Components
28
- Burner Controls
  29
- Power Exhaust Relay
  29
- Blower Motor Overload Relay
  29
- Unit Controller
  29
- Compressor Overload Relays
  30
- Variable Frequency Drive
  30
- VFD Power to Motor Contactor
  30
- Inverter Start Forward Rotation Relay/Vfd Controller (GP Board)
  30
- Plumbing, Compressor and Refrigerant Circuit Detail
  31
- Cooling Components
  34
- Compressors
  34
- Crankcase Heaters
  34
- High Pressure Switches
  34
- Filter Drier
  35
- Condenser Fans
  35
- Low Pressure Switches
  35
- Low Ambient Switches
  35
- Freezestats
  36
- Temperature Sensors
  36
- Pressure Transducer
  36
- Standard Blower Assembly Diagram
  37
- Tensioner Blower Assembly Diagram
  37
- Operation/Adjustment
  38
- Blower Compartment
  38
- Blower Wheels
  38
- Indoor Blower Motor
  38
- Blower Operation
  39
- Determining Unit Air Volume
  39
- Minimum and Maximum Pulley Adjustment
  39
- Location of Static Pressure Readings
  40
- Blower Belt Adjustment
  40
- Check Belt Tension
  41
- Manufacturer's Numbers
  41
- Gas Heat Components
  42
- Burner Ignition Control
  42
- Heat Exchanger
  43
- Gas Heat Exchanger Inserts
  43
- Burner Assembly
  43
- Primary High Temperature Limits
  44
- Flame Roll-Out Limit
  45
- Combustion Air Prove Switch
  45
- Combustion Air Inducer
  45
- Gas Valves
  45
- Flame Sensors
  46
- Spark Electrodes
  46
- All-Aluminum Coil Normal Operating Pressures - TXV
  47
- Charging
  47
- Refrigerant Charge and Check
  47
- Placement and Installation
  47
- All-Aluminum Coil Charging Curves
  49
- Refrigerant Charge and Check - Fin/Tube Coil - TXV
  51
- Refrigerant Charge and Check - Fin/Tube Coil & RFC
  52
- Charge Verification - Approach Method - AHRI Testing
  52
- Normal Operating Pressures - Fin/Tube - RFC
  53
- Charging Curves - Fin/Tube - RFC
  53
- Refrigerant Charge and Check - Fin/Tube Coil & TXV
  54
- Preliminary and Seasonal Checks
  55
- Cooling Start-Up
  55
IV-Start up - Operation
55
- Turning off Gas to Appliance
  56
- Safety or Emergency Shutdown
  56
- Heating Start-Up
  56
- Placing Furnace in Operation
  56
- Heating System Service Checks
  57
- Testing Gas Piping
  57
- Testing Gas Supply Pressure
  57
- Check and Adjust Manifold Pressure
  57
- Proper Gas Flow
  58
- Inshot Burner
  58
- Spark Electrode Gap
  58
- Heat Exchanger/Flame Sensing
  58
- Maintenance
  59
- Evaporator Coil
  59
- Filters
  59
High Altitude
59
- Transitions
  60
- Blower Proving Switch
  60
- Mounting Frames
  60
- Accessories
  60
- LAOAD (M) Motorized Outdoor Air Damper View
  61
- Manual Outdoor Air Damper View
  61
- Economizer
  62
- Gravity Exhaust Dampers
  63
- LAPEF Power Exhaust Fans
  63
- Optional Cold Weather Kit
  64
- Control Systems
  64
- Indoor Air Quality (CO2) Sensor
  64
- Drain Pan Overflow Switch S149
  64
- Factory Installed-Hot Gas Reheat
  65
- Reheat Mode Refrigerant Routing
  65
- Cooling Mode Refrigerant Routing
  65
- Check-Out
  66
- Reheat Setpoint
  66
- Reheat Coil Solenoid Valve
  66
- Belt Drive Supply Air Inverter
  67
- Inputs Required to Stage Supply Air Blower
  67
- Adjust CFM
  68
- Set Damper Minimum Position
  68
- VFD Bypass Option
  68
- Blower CFM Design Specifications
  68
- Minimum and Maximum CFM Table
  69
- Direct Drive Supply Air Inverter
  70
- Set Blower Speed
  70
- Staged Supply Air Operation
  71
- Wiring Diagrams and Sequence of Operation
  72
XI-Wiring and Operation Sequence
72

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Lennox LGH122U4M Unit Information

Lennox LGH122U4M Unit Information (92 pages)

Brand: Lennox | Category: Air Handlers | Size: 10.31 MB

Table of Contents

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