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LGH300S
Lennox LGH300S Installation Instructions
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Page 35
507124-04 3/2016
70
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160
170
LGH/LCH300S CHARGING CURVE CIRCUIT 3
Suction Pressure (psig)
Outdoor Temperature (°F)
115°
105°
95°
85°
75°
65°
130
100
70
80
90
100
110
120
110
120
130
140
150
160
170
LGH/LCH300S CHARGING CURVE CIRCUIT 4
Suction Pressure (psig)
Outdoor Temperature (°F)
115°
105°
95°
85°
75°
65°
100
130
34
36
Table of Contents
Table of Contents
1
Unit Dimensions
2
Parts Arrangement Diagram
5
Requirements
6
Shipping and Packing List
6
General
6
Downflow Discharge Application
7
Unit Support
7
Horizontal Discharge Applications
8
Duct Connection
8
Rigging Unit for Lifting
8
Condensate Drains
8
Connect Gas Piping
9
Pressure Test Gas Piping
10
High Altitude Derate
10
Electrical Connections
10
Wire Routing
11
Zone Sensor Mode
11
Thermostat Location
11
Control Wiring
11
Hot Gas Reheat Units Only
12
Humidity Sensor Cable Applications
12
Minimum and Maximum Pulley Adjustment
13
Blower Access
13
Blower Operation and Adjustments
13
Blower Belt Adjustment
14
Blower Assembly - no Tensioner
14
Location of Static Pressure Readings
14
Pulley Alignment - no Tensioner
15
Pulley Alignment - with Tensioner
15
Check Belt Tension
16
Field-Furnished Blower Drives
16
Blower Data
17
Blower Data
18
Preliminary Checks
20
Cooling Start-Up
20
Refrigerant Circuits View
21
Refrigerant
22
Refrigerant Charge and Check - All-Aluminum Coils
23
Normal Operating Pressures
23
Charging Curve Circuits
26
Refrigerant Charge and Check - Fin/Tube Coil
36
Charge Verification - Approach Method - AHRI Testing (Fin/Tube Coil)
38
Compressor Controls
38
Freezestats
39
Gas Heat Start-Up (Gas Units)
40
Placing Unit in Operation
41
Turning off Gas to Unit
41
Set Maximum CFM
42
Electric Heat Start-Up (LCH Units)
42
Heating Operation and Adjustments
42
Supply Air Inverter Start-Up
42
Set Blower Speeds
43
Set Damper Minimum Position
43
Blower CFM Design Specifications
43
Inverter Bypass Option
44
Minimum and Maximum CFM
44
Supply Air Inverter Operation
46
Hot Gas Reheat Start-Up and Operation
48
Humidity Sensor
48
Default Reheat Operation
48
Reheat Setpoint
48
Refrigerant Routing Diagrams
49
Reheat Operation
51
Lubrication
52
Burners (Gas Units) Maintenance
52
Filters
52
Service
52
Combustion Air Inducer (Gas Units) Maintenance
53
Factory Unit Controller Settings
54
Flue Passageway and Flue Box (Gas Units)
54
Supply Air Blower Wheel Maintenance
54
Condenser Coil Maintenance
54
Unit Controller Parameter Settings
54
Configuration ID 1
58
Configuration ID 2
59
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Lennox LGH300S Specifications
General
Brand
Lennox
Model
LGH300S
Category
Air Conditioner
Language
English
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