Greenheck DGX Installation, Operation And Maintenance Manual
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Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety
information. Failure to comply with instructions could result in personal injury and/or property damage!
As used in Greenheck models
•DGX
•IGX
•MSX
General Safety Information
Only qualified personnel should install and maintain
this system. Personnel should have a clear
understanding of these instructions and should
be aware of general safety precautions. Improper
installation can result in electric shock, possible injury
due to coming in contact with moving parts, as well as
other potential hazards. Other considerations may be
required if high winds or seismic activity are present.
If more information is needed, contact a licensed
professional engineer before moving forward.
1. Follow all local electrical and safety codes, as
well as the National Electrical Code (NEC), the
National Fire Protection Agency (NFPA), where
applicable. Follow the Canadian Electric Code
(CEC) in Canada.
2. Unit must be securely and adequately grounded.
3. Verify that the power source is compatible with
the equipment.
4. Never open access doors to the unit while it is
running.
®
Packaged DX Module
DANGER
• Always disconnect power before working on or
near this equipment. Lock and tag the disconnect
switch or breaker to prevent accidental power up.
• If this unit is equipped with optional gas
accessories, turn off gas supply whenever power
is disconnected.
CAUTION
This unit is equipped with a compressed refrigerant
system. If a leak in the system should occur,
immediately evacuate and ventilate the area. An
EPA Certified Technician must be engaged to make
repairs or corrections. Refrigerant leaks may also
cause bodily harm.
CAUTION
When servicing the unit, the internal components
may be hot enough to cause pain or injury. Allow
time for cooling before servicing.
Packaged DX Module for Make-Up Air
Part #474681
Recognized Component
1
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Summary of Contents for Greenheck DGX
- Page 1 Please read and save these instructions for future reference. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or property damage! As used in Greenheck models •DGX •IGX •MSX...
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Page 2: Table Of Contents
Table of Contents Receiving This Packaged DX Module is installed as a component Receiving ........2 of a make-up air unit and does not require any special Unpacking . -
Page 3: Storage
Installation Issues Storage Units are protected against damage during shipment. Provide and Install Switch S4 If the unit cannot be installed and operated Each Packaged DX unit requires an On/Off switch to immediately, precautions need to be taken to prevent enable the unit to run. -
Page 4: Product Overview
Packaged DX be found when the module is installed in either a END VIEW OF MAKE-UP AIR UNIT WITH PACKAGED DX Greenheck model IGX or MSX that was not ordered Product Overview with an inlet damper module. DX System... -
Page 5: Factory Installed Refrigeration System
Factory Installed Refrigeration System Components Circuit A Condenser Coil Pressure Port for Troubleshooting Reheat Valves High Side Pressure Drop Service Valve for Superheat and Low Side Pressure Service Valve for Subcooling Gauge/ High Side Pressure Drop 1. Thermostatic Expansion Valve (TXV) reset, which will close the circuit and allow the Each unit is equipped with a Thermal system to run when the pressure increases back to... - Page 6 Factory Installed Components (continued) 7. Condenser Fans The unit is equipped with one, two or three direct-drive condensing fans. The fans provide the necessary airflow to cool the refrigerant in the condensing coil. The motors are equipped with sling protection to guard against water penetration, and are thermally protected.
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Page 7: Components
Compressor Compartment Additional Control Components Components In addition to the control components located in the PDX module, various high- and low-voltage circuits Each Packaged DX module has a complete set of are found in the Make-Up Air Unit control center. See compressor contactors, condenser fan contactors, the unit-specific wiring diagram (found in the unit relays and certain integral safety controls located in... -
Page 8: Typical Wiring Diagram
Typical Wiring Diagrams MAIN POWER TO UNIT - 460V SUPPLY FAN DG FURNACE CONTR HLC1 LOCATED IN COOLING MODULE CONTROL CENTER HLC1 COMPRESSOR #1 COMPRESSOR #2 CONDENSER FAN #1 75 VA Y-OUT CONDENSER FAN #2 24 VAC UNIT CONTROL PDX CONTROL COMPONENTS ST1OL COMPON... - Page 9 DG FURNACE CONTROL 40 VA 24 VAC HLC1 LOCATED ® IN COOLING MODULE CONTROL CENTER HLC1 Wiring Diagram Code: GD11N601A013C10NM08 SENSOR SPARK CAUTION UNIT SHALL BE GROUNDED IN ACCORDANCE WITH N.E.C. POWER MUST BE OFF WHILE SERVICING. NOTES USE COPPER CONDUTORS ONLY 60°...
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Page 10: Component Locations
10°F and the second stage differential is set at 5°F. at 10°F and the second stage differential is set at 5°F. Model DGX Make-Up Air Unit See the chart below for a graphical representation of See the chart below for a graphical representation of the control operation. -
Page 11: Control Sequence/Variable Air Volume (Optional)
Pre Start-Up Control Sequence - Variable Air Volume (optional) Pre Start-Up Checklist 1. Heating/Cooling switch (S4) is closed between (Complete prior to application of power) terminal R and Y1. Verify proper drain trap installation. Refer to 2. N.O. contact on fan relay (RF) is energized and Condensate Drain in Installation Concerns section. -
Page 12: Start-Up Checklist
Start-Up Checklist Compressors (continued) Each DX unit is equipped with either one or two compressors. Each compressor is part of a separate refrigeration circuit. All motor(s) / compressor(s) have been checked for rotation. If blower rotation is incorrect, wiring must CIRCUIT A be changed at the disconnect to ensure all motor(s) / Compressor:... - Page 13 Troubleshooting – Refrigeration Circuit (optional) TROUBLESHOOTING NOTE IMPORTANT Do not release refrigerant to the atmosphere! If required service procedures include the adding or Before any components are changed on the refrigeration system, the cause of the failure must be removing of refrigerant, the service technician must determined.
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Page 14: Troubleshooting - Refrigeration Circuit
Troubleshooting – Refrigeration Circuit (continued) Symptom Possible Cause Corrective Action Refrigerant overcharge. Check pressures, charge by subcooling. Condenser fan motor defective. Check fan motor. Condenser coil inlet obstructed or dirty. Check coil and inlet clearances. Check high side equalized pressures, Compressor starts Air or non-condensables in system. - Page 15 Troubleshooting – Refrigeration Circuit (continued) Symptom Possible Cause Corrective Action Check for high entering wet bulb Excessive load on evaporator coil. temperature, check for excessive air. Check Digital Scroll controller signal and Compressor is unloaded (Digital Scroll). solenoid valve. Check the thermal expansion valve, ensure bulb is insulated.
- Page 16 Symptom Possible Cause Corrective Action Check subcooling, check for leak. Repair Insufficient refrigerant charge. leak and add refrigerant. Defective or improperly adjusted Check superheating and adjust thermal Low discharge expansion valve. expansion valve. pressure Low suction pressure. See “low suction pressure”. Faulty condenser temperature controls.
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Page 17: Routine Maintenance
Routine Maintenance Maintenance Procedures: Lubrication DANGER Check all moving components for proper lubrication. Apply lubricant where required. Any components Electric shock hazard. Can cause injury or death. showing excessive wear should be replaced to Before attempting to perform any service or maintain the integrity of the unit and ensure proper maintenance, turn the electrical power to the unit operation. -
Page 18: Maintenance Log
Maintenance Log Date __________________ Time _____________ AM/PM Date __________________ Time _____________ AM/PM Notes:___________________________________________ Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ Date __________________ Time _____________ AM/PM Date __________________ Time _____________ AM/PM Notes:___________________________________________ Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ Date __________________ Time _____________ AM/PM... - Page 19 Maintenance Log Date __________________ Time _____________ AM/PM Date __________________ Time _____________ AM/PM Notes:___________________________________________ Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ Date __________________ Time _____________ AM/PM Date __________________ Time _____________ AM/PM Notes:___________________________________________ Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ Date __________________ Time _____________ AM/PM...
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Page 20: Warranty
Warranty Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the shipment date. Any units or parts which prove to be defective during the warranty period will be replaced at our option when returned to our factory, transportation prepaid.
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