Greenheck DGX User Manual

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Part # 464043

®

**WARNING**

Disconnect and secure all electrical power to the

“OFF” position prior to inspection or servicing.

Failure to comply with this safety precaution

could result in serious injury or death.

**IMPORTANT**

All factory provided lifting lugs must be used when lifting any unit. Failure to comply with this safety

precaution could result in property damage, serious injury or death.

FOR YOUR SAFETY

If you smell gas

1. Open windows

2. Don’t touch electrical switches

3. Extinguish any open flames

4. Immediately call your gas supplier

Report any damaged equipment to the shipper immediately!

All units are shipped on a skid or packaged to minimize damage during shipment. The transporting carrier has

the responsibility of delivering all items in their original condition as received from Greenheck. The individual

receiving the equipment is responsible for inspecting the unit for obvious or hidden damage, recording any

damage on the bill of lading before acceptance and filing a claim (if required) with the final carrier. Some

accessory items are stored inside the unit during shipping. Care must be taken during installation to prevent

damage to units.

FOR YOUR SAFETY

The use and storage of gasoline or other

flammable vapors and liquids in open

containers in the vicinity of this appliance

is hazardous.

**WARNING**

Improper installation, adjustment, alteration,

service or maintenance can cause property

damage, injury or death. Read the installation,

operating, and maintenance instructions

thoroughly before installing or servicing this

equipment.

MaintenanceTroubleshootingOperationStart-UpInstallation Reference

MODEL DG / DGX (Direct Spark)

Make-Up Air Unit

Installation, Operation and Maintenance Manual

Questions and Answers:

J
jesse99Aug 17, 2025
How to troubleshoot a Greenheck Burner compressor that won't start?
- C
  Christopher GonzalezAug 17, 2025
  If your Greenheck Burner compressor isn't starting, several factors could be at play. First, ensure the disconnect switch or circuit breaker is closed. Check the voltage to the contactor coil, transformer, slave relay, and system, replacing parts if needed. Look for blown fuses or tripped breakers, addressing the cause before replacing them. Verify that the line voltage is within 10% of the compressor's rating, and correct it if necessary. Give the motor thermal protector time to reset (about 2 hours) after it cools down. Also, inspect the wiring for looseness and tighten terminals as needed. If these steps don't resolve the issue, the compressor motor or pressure switch may be defective, or the room thermostat may be open.
G
Grace OdomAug 23, 2025
Why does my Greenheck Burner compressor start but cut out on low pressure?
- A
  Angie GreerAug 23, 2025
  If your Greenheck Burner compressor starts but cuts out due to low pressure (activating at 50 psig), it could be due to low or loss of refrigerant charge, restricted airflow, or a restriction in the refrigerant line. Check refrigerant pressures, look for a dirty evaporator coil or filters, closed dampers, an iced evaporator coil, or an improper belt. Also, check motor amps and duct design. Examine refrigerant pressure, and check and adjust the thermal expansion valve. If it's not working correctly, check for a pressure drop across the filter-drier.
J
Jonathan JohnsonAug 28, 2025
Why does my Greenheck Burner compressor hum but not start?
- K
  kelliewolfAug 28, 2025
  If your Greenheck Burner compressor hums but doesn't start, possible causes include incorrect wiring, low line voltage, loose wiring, a defective start relay, damaged motor windings, or internal compressor mechanical damage. To troubleshoot, review the wiring schematics, check the voltage, check all connections, and replace the relay. Also, verify amp draws and replace the compressor if necessary.
B
Becky HoltAug 31, 2025
What causes high suction pressure in a Greenheck Burner compressor?
- S
  stephanieespinozaAug 31, 2025
  High suction pressure in your Greenheck Burner compressor can stem from several issues: an excessive load on the evaporator coil, the compressor being unloaded (if it's a Digital Scroll), an expansion valve sensing bulb not properly secured to the suction line, a thermostatic expansion valve pressure limit feature that's incorrect or inoperative (overfeeding), a room load that's too large, or the system being overcharged. Solutions involve checking for high entering wet bulb temperature and excessive air, checking the Digital Scroll controller signal and solenoid valve, ensuring the thermal expansion valve bulb is insulated and secured, adjusting superheat, reducing the load or adding more equipment, and checking pressures and subcooling.
H
htorresSep 2, 2025
Why is my Greenheck Burner compressor so noisy or vibrating?
- A
  Anne PetersSep 2, 2025
  If your Greenheck Burner compressor is excessively noisy or vibrating, the cause might be refrigerant overcharge, liquid floodback, tubing rattle, a scroll compressor rotating in reverse (for 3-phase systems), a worn or damaged compressor, or improper mounting on the unit base. Check pressures and subcooling, and the thermal expansion valve setting. Dampen tubing vibration by taping or clamping, and rewire for opposite rotation if the compressor is rotating in reverse. If the compressor is worn or damaged, replace it. Also, verify that the compressor is properly isolated on the unit base.
S
Stephanie MaciasSep 5, 2025
How do I troubleshoot high discharge pressure in my Greenheck Burner?
- B
  Brenda GilbertSep 5, 2025
  To troubleshoot high discharge pressure in your Greenheck Burner, you should check several potential causes. These include the thermal expansion valve setting, a dirty or obstructed air inlet to the condenser, a defective condenser fan motor, too much refrigerant in the system, non-condensables in the system, a dirty condenser coil, a condenser fan not running or running backwards, and high load conditions. Suggested solutions include checking the thermal expansion setting and calibrating superheat/subcooling, checking for proper clearances and possible air recirculating, checking the condenser fan motor, removing excess refrigerant or non-condensables, cleaning the condenser coil, checking the electrical circuit and fuse, and adding more equipment or reducing the load.
S
sherylgonzalezSep 12, 2025
What causes my Greenheck Burner compressor to short cycle?
- A
  Abigail HernandezSep 12, 2025
  A Greenheck Burner compressor that short cycles could be due to several issues: the thermostat location or controls malfunctioning, an improper refrigerant charge, a defective high or low-pressure control, liquid floodback, a defective expansion valve, poor air distribution, high discharge pressure, leaking discharge valves in the compressor, low airflow at the evaporator(s), or an incorrect unit selection (oversized). Solutions involve checking the thermostat and heat anticipator setting, verifying subcooling and superheat, checking the high or low-pressure switch, checking the thermal expansion valve and superheat, checking ductwork for recirculating, checking blower operation and airstream restrictions. For an oversized unit, contact the factory.
R
Robert FisherSep 14, 2025
What could cause low discharge pressure in my Greenheck Burner?
- V
  vmurraySep 14, 2025
  Low discharge pressure in your Greenheck Burner could be due to an insufficient refrigerant charge, a defective or improperly adjusted expansion valve, low suction pressure, or faulty condenser temperature controls. To resolve this, check subcooling and look for leaks, repairing any leaks and adding refrigerant as needed. Also, check superheating and adjust the thermal expansion valve, and check the condenser controls and reset them to obtain the desired condensing temperature.

Greenheck DGX Specifications

General

Drive Type	Direct Drive
Horsepower Range	15 hp
Voltage Options	115/230/460V, 3-phase
Wheel Material	Steel
Motor Type	TEFC (Totally Enclosed Fan Cooled)
Mounting	Horizontal or Vertical
Housing Material	Steel
Options	Variable Frequency Drives

Summary

Installation Procedures

Indoor Unit Installation

Roof Mounted Unit Installation

Guidelines for DB/HZ and DBC roof-mounted arrangements.

Electrical Wiring Installation

Steps for determining power needs and making electrical connections.

Direct Gas Piping Installation

Procedures for connecting the unit to the gas supply.

Start-Up Procedures

Blower Start-Up

Pre-start checks, voltage, and blower rotation verification.

Direct Gas Start-Up

Procedures for starting the direct gas burner system.

Evaporative Cooling Start-Up

Procedures for starting the optional evaporative cooling system.

Water Wizard™™ Start-Up

Operation

Recirculating / VAV Unit Operation

Electrical Operation Sequences

Water Wizard™™ Operation

Troubleshooting Guides

Blower and Heater Faults

Diagnosing and resolving blower and heater operational issues.

Evaporative Cooler and Water Wizard Issues

Mechanical and System Issues

Maintenance

Routine Maintenance

Seasonal Maintenance (Fall)

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