User Manuals: lennox G21 Series Gas Furnace

Manuals and User Guides for lennox G21 Series Gas Furnace. We have 2 lennox G21 Series Gas Furnace manuals available for free PDF download: Unit Information, Installation Instructions

lennox G21 Series Unit Information

lennox G21 Series Unit Information (100 pages)

Brand: lennox | Category: Industrial Equipment | Size: 2.02 MB

Table of Contents

Pulse Combustion Process
1
Electrostatic Discharge (Esd)
2
Table of Contents
2
Parts Arrangement (G21 Upflow Unit)
3
Parts Arrangement (Gsr21 Downflow Horizontal Unit)
3
Specifications
4
Blower Data
6
Blower Performance
6
Gsr21V5−80/100 Blower Motor Performance
9
Gsr21V3−80 Blower Motor Performance
9
G21V5−80/100 Blower Motor Performance
9
Factory Blower Speed Settings
10
Units Equipped with an Electronically Controlled Blower Motor ICM1
10
Unit Components Horizontal/Reverse Flow V" Units
11
Unit Components Upflow Q" Units
11
1 I Application

12
- Low Voltage Terminal Strip TB1
  13
- Imc1 Motor
  13
- Imc2 Motor
  13
- Terminal Block TB2
  14
- K3 Indoor Blower Relay
  14
- Fan Timing Control A28
  14
- K9 Isolation (Heat) Relay
  15
- VSP1 Blower Control
  15
  - Diagnostic LED Lights
    16
  - Vsp1 Blower Control Board (A24)
    16
  - Voltages into Vsp1
    16
  - VSP2 Blower Control Board (A24)
    17
  - Vsp2−1 Blower Control Board (A24)
    17
  - Jumper Settings
    18
  - Ds3 On/Off
    18
  - Ds2 Heat
    18
  - Ds4 Cfm
    18
  - Heating Blower
    19
  - Heat
    19
  - High
    19
  - Low
    19
  - V" Modulation/Limit Control
    20
  - Modulation Control S78
    20
  - Limit Control S10
    20
  - Secondary Limit S21
    21
  - Auxiliary Fan Control
    21
  - GSR21Q" Applications
    21
  - GSR21 V" Applications
    21
  - Watchguard
    22
  - Lennox GC 1 Ignition Control
    22
  - Lennox GC 3 Ignition Control
    22
  - Gc 3 Ignition Control
    23
  - G891 Ignition Control
    23
  - Ignition Control Functions
    23
  - Gc 1, Gc 3, and G891 Ignition Attempt Sequence for Retrials
    24
  - Gas Valve and Expansion Tank
    24
  - Expansion Tank
    24
  - Gas Valve Conversion
    24
  - Lp Changeover Procedure
    25
  - Differential Pressure Switch
    26
  - Gas Intake Flapper Valve & Assembly
    26
  - Air Intake Chamber
    26
  - Purge Blower
    26
  - Spark Plug & Sensor
    27
  - Combustion Chamber
    27
  - Tailpipe
    27
  - Exhaust Decoupler
    27
  - G21 Combustion Components
    28
  - Gsr21 Combustion Components
    28
  - Blower Motors and Capacitors
    29
  - Blower Speed Selection Leadless Motors
    29
  - Blower Speed Tap Selection
    29
  - G21V/Gsr21V Motor Blower Housing
    30
  - G21V/Gsr21V Blower Motor B3
    30
  - Internal Operation
    30
  - G21V/Gsr21V Blower Motor Components
    30
  - Initial Power up
    31
  - Motor Start up
    31
  - Motor Speed Control
    32
  - Low Speed Heat/Cool
    32
  - High Speed Heat
    32
  - High Speed Cool
    32
  - External Operation ICM1
    33
  - Blower Speed Taps "V" Units
    33
  - Blower B3 Harness Connectors
    33
  - Blower Motor Connector Locations
    33
- Blower Motor Q Units
  33
  - Blower B3 Speed Taps
    34
  - Heating Mode
    34
  - Single Stage Heating
    34
  - Two−Stage Heating
    34
  - External Operation ICM2
    35
  - Precautions ICM1 and ICM2
    35
  - Coil Choke L13
    35
  - Ecm Switching Frequency
    35
  - Vsp2−1 Operation
    36
  - Proper Installation
    36
  - Proper Grounding
    36
  - Transporting the Unit
    36
  - Typical Gsr21 Horizontal Installation*
    37
  - Typical G21 Installation
    38
  - Typical Gsr21 Downflow Installation*
    39
  - Condensate Line
    40
  - Gas Connector A.g.a. Units Only
    40
  - Muffler
    40
  - Exhaust Insulation
    40
  - Drip Leg Assembly
    41
  - Proper Horizontal Installation
    41
  - Raised Platform
    41
  - Drain Pan
    41
  - Service Procedures for Ball Float Condensate Trap
    42
  - Ball Float Condensate Trap
    42
  - Concentric Termination
    43
  - Concentric Wall Termination
    43
  - Minimum Diameter for G21/Gsr21 Venting
    43
  - Standard Intake/Exhaust Termination
    43
  - Wall Termination Kit
    44
  - Top View Wall Termination
    44
  - Side View Wall Termination
    44
  - Roof Termination
    44
  - Seasonal Maintenance
    45
  - Supply Air Blower
    45
  - Filters
    45
  - Fan Controls & Limit Controls
    45
  - Cleaning Heat Exchanger Assembly
    46
2 Unit Components

12
- Control Box
  12
- Control Transformer T1
  12
5 Unit Checkout

46
- Temperature Rise
  46
- To Measure Temperature Rise
  46
- External Static Pressure
  47
- Manifold Pressure
  47
- Line Pressure
  47
- Flame Signal
  47
- Gc 3 Flame Signal Test
  48
- Transducer Usage
  48
- Gc 1 Flame Signal Test
  48
- Exhaust CO (Carbon Monoxide) Content
  49
- Heat Exchanger Temperatures
  49
- Exhaust Temperature Range
  49
- Maximum Exhaust Temperatures
  49
- Condensate Ph Range
  50
- Acceptable Operating Input
  50
- Meter Flow Rate
  51
- Gas Rate Cubic Feet Per Hour
  51
- Air Flapper Valve Assembly
  52
- Checking Gas Orifice
  53
- Checking the Gas Flapper Valve
  53
6 Troubleshooting

54

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lennox G21 Series Installation Instructions

lennox G21 Series Installation Instructions (3 pages)

COMPLETEHEAT SERIES

Brand: lennox | Category: Heat Pump | Size: 0.27 MB

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