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LGH102H4M
Lennox LGH102H4M User Manual
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Page 84
LGH/LCH092-152U
ST
AGED SUPPL
Y AIR, DIRECT DRIVE BLOWER
Direct Drive EBM Blower Motor: The blower speed is deter
mined by thermostat demand and settings programmed into
the A55. When A55 receives a Y1 demand, a low speed volt
age
output from A55 terminal 4 will energize B3 in low speed.
Wh
e
n
A55 receives a Y2 demand, a high speed voltage output
from
A55 terminal 4 will energize B3 in high speed. A55 output
voltage can be checked between A55 terminals 4 and 6.
83
85
Table of Contents
Table of Contents
1
Options / Accessories
2
Specifications
8
High Altitude Derate
10
Specifications - Direct Drive Models
11
Specifications - Belt Drive Models
12
Specifications - Gas Heat
13
Blower Data
14
Maximum Static Pressure with Gas Heat - 2.0 In. W.g.
14
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
Direct Drive Blower Sequence of Operation/Troubleshooting
85
Blower Fault Sequence Direct Drive Motor
85
Failure Handling/Troubleshooting
85
4
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Lennox LGH102H4M Specifications
General
Brand
Lennox
Model
LGH102H4M
Category
Air Handlers
Language
English
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