Section One

 

About The Manual

2

Literature Change History

2

Overview of Manual

2

Section Two

 

General Information

4

Model Number Description

4

Hazard Identification

6

Commonly Used Acronyms

6

Unit Description

6

Input Devices & System Functions

8

Constant Volume & Variable Air Volume Units

8

Constant Volume (CV) Units

10

Variable Air Volume (VAV) Units

11

Space Temperature Averaging

12

Unit Control Modules (UCM)

12

Section Three

 

Installation

14

Unit Inspection

14

Storage

14

Unit Clearances

14

Unit Dimensions & Weight Information

14

Roof Curb and Ductwork

22

Pitch Pocket Location

23

Unit Rigging & Placement

23

General Unit Requirements

25

Main Electrical Power Requirements

25

Field Installed Control Wiring

25

Requirements for Electric Heat Units

25

Requirements for Gas Heat

25

Requirements for Hot Water Heat (SLH_)

25

Requirements for Steam Heat (SSH_)

26

O/A Pressure Sensor and Tubing Installation

26

Condensate Drain Connection

27

Shipping Fasteners

27

O/A Sensor & Tubing Installation

31

Units with Statitrac™;

31

Gas Heat Units (SFH_)

32

Connecting the Gas Supply Line to the Furnace

 

Gas Train

32

Flue Assembly Installation

34

Hot Water Heat Units (SLH_)

34

Steam Heat Units (SSH_)

35

Disconnect Switch External Handle

38

Electric Heat Units (SEH_)

38

Main Unit Power Wiring

38

Disconnect Switch Sizing (DSS)

44

Field Installed Control Wiring

45

Controls using 24 VAC

45

Controls using DC Analog Input/Outputs

45

Constant Volume System Controls

45

Variable Air Volume System Controls

46

Constant Volume or Variable Air Volume System

 

Controls

46

Table of Contents

 

Section Four

 

Unit Start-Up

55

Cooling Sequence of Operation

55

Gas Heating Sequence of Operation

56

Fenwal Ignition System

56

Honeywell Ignition System

56

Modulating Gas Sequence of Operation

57

Flame Failure

57

Electric Heat Sequence of Operation

58

Wet Heat Sequence of Operation

58

Electrical Phasing

59

Voltage Supply and Voltage Imbalance

60

Service Test Guide for Component Operation

61

Verifying Proper Fan Rotation

63

If all of the fans are rotating backwards;

63

System Airflow Measurements

63

Constant Volume Systems

63

Variable Air Volume Systems

65

Exhaust Airflow Measurement

66

TraqTM Sensor Airflow Measurement

66

Economizer Damper Adjustment

80

Compressor Start-Up

82

Compressor Operational Sounds

83

Thermostatic Expansion Valves

93

Charging by Subcooling

93

Low Ambient Dampers

93

Electric, Steam and Hot Water Start-Up

94

Gas Furnace Start-Up

94

Two Stage Gas Furnace

95

Full Modulating Gas Furnace

97

Limited Modulating Gas Furnace

98

Final Unit Checkout

99

Section Five

 

Service & Maintenance

100

Fan Belt Adjustment

104

Scroll Compressor Replacement

105

VFD Programming Parameters

106

Monthly Maintenance

107

Filters

107

Cooling Season

107

Heating Season

108

Coil Cleaning

108

Final Process

109

Index

111

Warranty

114

3

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