Sears GT Series User Manual

Installation Instructions
NOTE: Read the entire instruction manual before starting the installation,
TABLE OF CONTENTS
PAGE NO.
SAFETY CONSIDERATIONS ...................................................................... 2
APPLICATION CONSIDERATIONS ................................................................. 3
Geothermal Systems .......................................................................... 3
Well Water Systems ........................................................................... 4
INSTALLATION RECOMMENDATIONS ............................................................ 6
CONFIGURATIONS ............................................................................... 6
Horizontal Configuration ...................................................................... 6
Counter-Flow Configuration ................................................................... 12
Vertical Configuration ......................................................................... 12
MOUNTING VERTICAL UNITS .................................................................... 20
MOUNTING HORIZONTAL UNITS ................................................................. 20
CONDENSATE DRAIN ............................................................................. 20
DUCT SYSTEM ................................................................................... 20
PIPING .......................................................................................... 21
ELECTRICAL .................................................................................... 21
Safety Devices and UPM Controller .............................................................. 22
ECM Interface Board ......................................................................... 25
FACTORY INSTALLED FEATURES ................................................................. 27
Constant Airflow Motor ....................................................................... 27
Smart Start Assist ............................................................................ 27
Pump Relay ................................................................................ 27
Comfort Alert Diagnostics Module (CADM) ....................................................... 27
Heat Recovery Package (HRP) .................................................................. 28
FIELD INSTALLED ACCESSORIES ................................................................. 29
SEQUENCE OF OPERATION ....................................................................... 30
Cooling Mode ............................................................................... 30
Heating Mode ............................................................................... 30
ELECTRONIC THERMOSTAT INSTALLATION ...................................................... 30
SYSTEM CHECKOUT ............................................................................. 31
UNIT START-UP .................................................................................. 31
MAINTENANCE .................................................................................. 31
TROUBLESHOOTING ............................................................................. 32
OPERATING TEMPERATURES AND PRESSURES TABLES ............................................ 36
AIRFLOW TABLES ............................................................................... 40
WATER SIDE PRESSURE DROP TABLE ............................................................. 42
SMART START LED INDICATORS .................................................................. 43

Sears GT Series Specifications

General

Heating Capacity	Varies by model, typically between 18, 000 BTU/h and 60, 000 BTU/h
Cooling Capacity	Varies by model, typically between 18, 000 BTU/h and 60, 000 BTU/h
SEER Rating	Varies by model, typically between 13 and 16
HSPF Rating	Varies by model, typically between 7.0 and 8.5
Stages	Single-stage or Two-stage (depending on the specific model)
Refrigerant	R-22 or R-410A (depending on the specific model and year of manufacture)
Warranty	Varies, typically 1-year parts and labor, 5-year compressor (check specific model details)

Summary

SAFETY CONSIDERATIONS

Cut Hazard Warning

Warning about sharp edges on sheet metal parts.

Explosion Hazard Warning

Warning against using oxygen for leak testing or operation.

Puron® Refrigerant System Safety

Warning about Puron® refrigerant systems and R-22 service equipment.

Electrical Shock Hazard Warning

Warning to disconnect power before servicing the unit.

APPLICATION CONSIDERATIONS

UNIT CONFIGURATION TYPES

Horizontal Unit Configuration

Vertical Unit Configuration

BLOWER RE-CONFIGURATION PROCEDURES

PIPING AND ELECTRICAL INSTALLATION

Electrical Wiring and Connections

UPM CONTROLLER AND SAFETY DEVICES

UPM Controller Features and Safety

Details on UPM board, safety controls, and LED indicators.

UPM DIP Switch Configuration

UPM Sequence of Operation Logic

Flow chart detailing UPM board fault detection and lockout logic.

ECM INTERFACE AND DEHUMIDIFICATION

OPERATIONAL MODES AND THERMOSTAT SETUP

Cooling Mode Sequence of Operation

Unit operation sequence when cooling is called for by the thermostat.

Heating Mode Sequence of Operation

SYSTEM CHECKS, START-UP, AND MAINTENANCE

Pre-Start System Checkout

Pre-energization checks for voltage, wiring, and piping.

Unit Initial Start-Up Procedure

Sequence for initial unit start-up and verification.

TROUBLESHOOTING GUIDES AND ERROR CODES

UPM Board LED Error Code Interpretation

Interpretation of LED indications for unit errors and faults.

HRP System Troubleshooting

General Unit Troubleshooting

Common unit faults and their causes and correction steps.

COMFORT ALERT MODULE DIAGNOSTICS

Flash Code Interpretation and Solutions

Explains LED flash codes for diagnosing system faults.

PERFORMANCE DATA TABLES

SMART START ASSIST LED INDICATORS