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Greenheck DGX Installation, Operation And Maintenance Manual
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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 these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
As used in Greenheck models
• DGX
• MSX

General Safety Information

WARNING
For A2L appliance only. LEAK DETECTION SYSTEM
installed. Unit must be powered except for service.
WARNING
This unit is equipped with electrically powered safety
measures. To be effective, the unit must be electrically
powered at all times after installation, other than when
servicing.
WARNING
Do not use means to accelerate the defrosting
process or to clean, other than those recommended
by the manufacturer.
The appliance shall be stored in a room without
continuously operating ignition sources (for example:
open flames, an operating gas appliance or an
operating electric heater.
Do not pierce or burn.
Be aware that refrigerants may not contain an odor.
®
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
Document 486959
Packaged DX Module
Refrigerant
Safety Group
A2L
1

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Summary of Contents for Greenheck DGX

  • Page 1: General Safety Information

    Protect yourself and others by observing all safety information. Failure to comply with these instructions will result in voiding of the product warranty and may result in personal injury and/or property damage. As used in Greenheck models Refrigerant • DGX Safety Group •...

  • Page 2: Table Of Contents

    General Safety Information Table of Contents General Safety Information ....1 Only qualified personnel should install and maintain this Receiving, Unpacking, Handling, Storage ..3 system.

  • Page 3: Receiving, Unpacking, Handling, Storage

    Receiving This module is installed as a component of a make-up air unit and does not require any special handling. Refer to the Receiving portion of the unit Installation, Operation and Maintenance (IOM) Manual for complete instructions on receiving, unpacking and handling. Unpacking The unit is shipped as a complete installed unit.

  • Page 4: Product Overview

    Model Number A metal plate is located on the fixed panel access to the control center. The plate is marked with the Platform type and tonnage. DGX - 115 - H22 - 5 Model Cooling Tonnage Parent 3 - 10...

  • Page 5: Installation

    Installation Installation Requirements WARNING If appliances connected via an air duct system to one Where minimum room areas, minimum airflows and conditioned space areas are defined, the following or more rooms with A2L REFRIGERANTS are installed in a room with an area less than the minimum room tables can be utilized to verify the installation in accordance with the releasable charge within a unit.

  • Page 6: Service Clearances

    Installation Lifting Service Clearances All units equipped with this module are provided with All make-up air units require minimum clearances on all either four or six lifting lugs. When the unit is being sides for routine maintenance. Filter replacement, drain hoisted, all of the provided lugs must be used for pan inspection and cleaning, fan bearing lubrication and support.

  • Page 7: Component Operation

    Typical Unit Control Center 3. Compressor 1. Power Distribution Block - Contactor NOTE: DRAWN BY field-supplied power from main disconnect switch is GREENHECK ECKA 4. Low Voltage THIS IS A GENERAL REPRESENTATION PDX COOLING DATE OF A COMPONENT LAYOUT. SDRs WILL 11/06 NOT ALWAYS FOLLOW THIS LAYOUT.
  • Page 8 Factory-Installed Refrigeration System Components Circuit A Condenser Coil Pressure Port for Optional Troubleshooting Reheat Valves High Side Pressure Drop Service Port for Superheat and Low Side Pressure Service Port for Subcooling Gauge/ High Side Pressure Drop 1. Thermostatic Expansion Valve (TXV) 8.

  • Page 9: Refrigeration System Service Requirements

    Refrigeration System Service Requirements • The ventilation machinery and outlets are operating Personnel working on appliances must be trained by a adequately and are not obstructed; national training organization or manufacturer that are • If an indirect refrigerating circuit is being used, the accredited to teach the relevant national competency secondary circuit shall be checked for the presence standards that may be set in legislation.
  • Page 10 Refrigeration System Service Requirements • Cylinders shall be kept in an appropriate position avoided as the chlorine may react with the refrigerant according to the instructions. and corrode the copper pipe-work. • Ensure that the refrigerating system is earthed prior If a leak is suspected, all naked flames shall be to charging the system with refrigerant.
  • Page 11 Refrigeration System Service Requirements K. Recovered refrigerant shall not be charged into REFRIGERANT: R-454B another refrigerating system unless it has been cleaned and checked. Equipment shall be labelled stating that it has been FACTORY FIELD TOTAL CIRCUIT CHARGE CHARGE CHARGE de-commissioned and emptied of refrigerant.

  • Page 12: Sequence Of Operation With Optional

    Sequence of Operation with Start-Up Unit Optional Microprocessor Controller DANGER The microprocessor controller will be located in the Electric shock hazard. Can cause injury or death. units main control center. Before attempting to perform any service or With a microprocessor maintenance, turn the electrical power to unit to OFF controller, the compressor at disconnect switch(es).

  • Page 13: Pre-Start-Up Checklist

    Start-Up Unit Every installation requires a comprehensive start-up SPECIAL TOOLS REQUIRED to ensure proper operation of the unit. As part of that • Voltage Meter (with wire probes) process, the following checklist must be completed and • Amperage Meter information recorded. Starting up the unit in accordance •...

  • Page 14: Start-Up Checklist

    Start-Up Checklist Line Voltage. Check at unit disconnect. L1-L2 Volts L2-L3 Volts L1-L3 Volts Condensing Fans Condensing Fan 1 Amps Amps Amps Compressors Outdoor Air Temperature Deg F Outdoor Air Relative Humidity % RH Return Air Temperature Deg F Return Air Relative Humidity % RH o Compressor 1: ________ L1 amps...

  • Page 15: Refrigeration Circuit

    Troubleshooting – Refrigeration Circuit TROUBLESHOOTING NOTE IMPORTANT Do not release refrigerant to the atmosphere! If Before any components are changed on the required service procedures include the adding or refrigeration system, the cause of the failure must be removing of refrigerant, the service technician must determined.
  • Page 16 Troubleshooting – Refrigeration Circuit (continued) Symptom Possible Cause Corrective Action Refrigerant overcharge. Check pressures, charge by subcooling. Compressor Condenser fan motor defective. Check fan motor. starts but Condenser coil inlet obstructed or dirty. Check coil and clearances. Clean coil if necessary. cuts out on high Check high side equalized pressures, check thermal...
  • Page 17 Troubleshooting – Refrigeration Circuit (continued) Symptom Possible Cause Corrective Action Check for high entering wet bulb temperature, check for Excessive load on evaporator coil. excessive airflow. Compressor is unloaded. Check digital scroll controller signal and solenoid valve. (digital scroll) Check the thermal expansion valve, ensure bulb is insulated.
  • Page 18 Troubleshooting – Refrigeration Circuit (continued) Symptom Possible Cause Corrective Action Check subcooling, check for leak. Repair leak and add Insufficient refrigerant charge. refrigerant. discharge Defective or improperly adjusted Check superheating and adjust thermal expansion valve. pressure expansion valve. Low suction pressure. See “low suction pressure”.

  • Page 19: Routine Maintenance

    Unit Control Center Compressor 1. Condensate Drain Inspect and clean. Refill with water or glycol. Model DGX Make-Up Air Unit Annually Condensing Fan It is recommended that the annual inspection and maintenance occur at the start of the cooling season.

  • Page 20: Maintenance Log

    As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice. Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature section of the website at Greenheck.com/Resources/Library/Literature.

This manual is also suitable for:

Msx