York SUNLINE DCG Series - User Manual

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INSTALLATION

MANUAL

CAUTION: READ ALL SAFETY GUIDES BEFORE YOU

BEGIN TO INSTALL YOUR UNIT.

SAVE THIS MANUAL

SUNLINE™

GAS/ELECTRIC SINGLE PACKAGE

AIR CONDITIONERS

D(CE, CG) 036, 048, 060 & 072

D(HE, HG) 036, 048 & 060

290699-YIM-B-0607

CONTENTS

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . 5

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

REFERENCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . 6

APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . 6

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . 45

START-UP (GAS HEAT). . . . . . . . . . . . . . . . . . . . 45

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . 48

SEE THE FOLLOWING PAGES FOR A COMPLETE TABLE OF CONTENTS.

NOTES, CAUTIONS AND WARNINGS

The installer should pay particular attention to the words:

NOTE, CAUTION, and WARNING. Notes

are intended to

clarify or make the installation easier. Cautions

are given to

prevent equipment damage. Warnings

are given to alert

installer that personal injury and/or equipment damage may

result if installation procedure is not handled properly.

Main Page

Questions and Answers

H
Haley SmithNov 2, 2025
What to do if the York SUNLINE DCG Air Conditioner compressor won't turn on?
- A
  Alexander LevyNov 2, 2025
  If the compressor on your York Air Conditioner isn't starting when the blower motor is running and cooling is requested, several issues could be the cause. First, if installed, check the position of the economizer blades, as the economizer might be providing free cooling. Also, examine the compressor contactor (M1) for line voltage and ensure it's engaged. Check for any loose wiring between the contactor and the compressor. If the compressor housing is hot, it may be off due to inherent protection; allow it to cool down before testing again. Check for 24 volts at the M1 coil; if present but M1 isn't engaged, the contactor may need replacement. Also verify that 24 volts are present at the UCB terminal C1 and check for loose wiring between C1 and the compressor contactor. Check the UCB Y1 te...
M
maxwellrhodesNov 17, 2025
How to fix a York SUNLINE DCG blower motor that won't start?
- D
  Dawn LewisNov 17, 2025
  If the supply air blower motor in your York Air Conditioner isn't starting after a short delay when cooling is activated and the compressors are running, here's what you can check: First, make sure the thermostat fan switch is set to the 'ON' position. If the blower motor works in the 'ON' position but not in 'AUTO' after the compressor starts, check the room thermostat for contact between R and G in the 'AUTO' position during cooling calls. Verify that line voltage is reaching the contacts of the M2 contactor and that the contactor is engaged; also, inspect for loose wiring between the contactor and the blower motor. If the motor housing is hot, it might be off due to internal protection; allow it to cool down before retesting. Check for 24 volts at the M2 coil; if present but M2 isn't en...

Summary

GENERAL

SAFETY CONSIDERATIONS

FIRE OR EXPLOSION HAZARD

Critical warning on gas and flammable materials.

INSPECTION

REFERENCE AND APPROVALS

PRODUCT NOMENCLATURE

INSTALLATION

INSTALLATION SAFETY INFORMATION

Critical safety steps before starting installation.

LIMITATIONS

Codes and standards for installation compliance.

LOCATION AND HANDLING

CLEARANCES

Required distances for operation and service access.

DUCTWORK AND DRAINAGE

CONDENSATE DRAIN

Requirements for plumbing the condensate drain line.

COMPRESSORS

FILTERS AND SERVICE ACCESS

ELECTRICAL WIRING

ELECTRIC HEAT WIRING

Specifics on installing field-installed electric heaters.

GAS HEAT OVERVIEW

GAS PIPING AND CONNECTION

L.P. GAS SYSTEMS

VENT AND COMBUSTION AIR HOODS

ECONOMIZER AND EXHAUST OPTIONS

References for economizer and power exhaust installation.

ECONOMIZER AND EXHAUST DAMPER ADJUSTMENTS

MINIMUM POSITION ADJUSTMENT

Procedure to set the minimum damper position.

ENTHALPY SET POINT ADJUSTMENT

How to set the enthalpy set point for economizer control.

POWER EXHAUST DAMPER SETPOINT (WITH OR WITHOUT POWER EXHAUST)

Procedure for setting the power exhaust damper.

PHASING AND BELT TENSION

PROCEDURE FOR ADJUSTING BELT TENSION

Detailed steps for adjusting belt tension.

SUPPLY AIR BLOWERS

CHECKING SUPPLY AIR CFM

OPERATION

SEQUENCE OF OPERATIONS OVERVIEW

General overview of unit operation logic.

COOLING SEQUENCE OF OPERATION

Detailed steps for unit operation in cooling mode.

COOLING OPERATION ERRORS

How the system handles cooling malfunctions.

COMPRESSOR SAFETY CONTROLS

LOW AMBIENT COOLING

Operation during low ambient temperature conditions.

SAFETY CONTROLS

ELECTRIC HEATING SEQUENCE

Single and Two-Stage Heating

Operation for single and two-stage electric heat.

FLASH CODES AND RESETS

HEAT ANTICIPATOR SETPOINTS

GAS HEATING SEQUENCE OF OPERATION

GAS HEAT OPERATION ERRORS

TEMPERATURE LIMITS

GAS VALVE AND SAFETY COMPONENTS

START-UP PROCEDURES

COOLING START-UP CHECKS

Pre-startup, operating, and post-startup checks for cooling.

GAS HEAT START-UP CHECKS

Pre-startup checks for gas heat operation.

GAS HEAT OPERATING INSTRUCTIONS

POST-START CHECK LIST (GAS)

Post-startup checks for gas heat operation.

GAS MANIFOLD AND BURNER ADJUSTMENTS

CHECKING GAS INPUT

ADJUSTMENT OF TEMPERATURE RISE

TROUBLESHOOTING OVERVIEW

COOLING TROUBLESHOOTING GUIDE

Guide for diagnosing and resolving cooling system issues.

COOLING TROUBLESHOOTING GUIDE

GAS HEAT TROUBLESHOOTING GUIDE

FLASH CODE TROUBLESHOOTING

How to troubleshoot using flash codes.

IGNITION CONTROL BOARD

Troubleshooting the ignition control board.

CENTRIFUGAL SWITCH AND LIMITS

ROLLOUT SWITCH

Troubleshooting the rollout switch.

GAS SYSTEM TROUBLESHOOTING

SYMPTOMATIC TROUBLESHOOTING

York SUNLINE DCG Series Specifications

General

Refrigerant	R410A
Series	SUNLINE DCG Series
Energy Efficiency Ratio (EER)	Varies by model
Coefficient of Performance (COP)	Varies by model
Indoor Unit Dimensions (HxWxD)	Varies by model
Outdoor Unit Dimensions (HxWxD)	Varies by model
Indoor Unit Weight	Varies by model
Outdoor Unit Weight	Varies by model