Greenheck ERCH - Energy Recovery Unit with Packaged DX (468151) - Manual (Page 2)

2
Energy Recovery Unit with Packaged DX
TABLE OF CONTENTS
Storage and Owners Information . . . . . . . . . .2
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . .3
Installation
Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Unit Weights & Recommended Roof
Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation Concerns . . . . . . . . . . . . . . . . . . . . .5
Roof Curb Mounting . . . . . . . . . . . . . . . . . . . 5-6
Rail Mounting and Ductwork Connections . . . .6
Electrical Information . . . . . . . . . . . . . . . . . . 7-8
Control Center Components . . . . . . . . . . . . . . .8
Service Clearances . . . . . . . . . . . . . . . . . . . . . .9
Dimensional Data/Access Door Description .10
Coil Applications & Drain Trap Info . . . . . . 11-12
Optional Accessories
Electric Heater Application/Operation . . . . . .13
Frost Control Application/Operation . . . . . . . .14
Economizer Application/Operation . . . . . . . . .15
Variable Frequency Drives . . . . . . . . . . . . . . .16
Typical Wiring Diagram . . . . . . . . . . . . . . . . . .17
Sensors and Lights . . . . . . . . . . . . . . . . . . 18-19
Remote Control Panel & Wiring . . . . . . . . 20-22
Sensors Mounted by Factory . . . . . . . . . . . . .23 Start-Up Checklist
Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-26
Optional Accessories . . . . . . . . . . . . . . . . . . . .27
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Energy Recovery Wheel . . . . . . . . . . . . . . . . .29
Routine Maintenance Checklist . . . . . . . . . . .33
Belts and Motors . . . . . . . . . . . . . . . . . . . . . . .34
Blower Wheel and Fasteners . . . . . . . . . . . . .34
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Coil Maintenance . . . . . . . . . . . . . . . . . . . . . .36
Energy Recovery Wheel Maintenance
Accessing Energy Recovery Wheel . . . . . . . .37
Removing Wheel Segments . . . . . . . . . . . . . .37
Cleaning Wheel Segments . . . . . . . . . . . . . . .38
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Sequence of Operation . . . . . . . . . . . . . . . 40-41
Troubleshooting -Airflow . . . . . . . . . . . . . . . . .42
Troubleshooting -General Unit . . . . . . . . . 43-44
Troubleshooting -Refrigeration Circuit . . 45-50
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
STORAGE
When a unit is not going to be in service for an extended amount of time, certain procedures should be followed
to keep the fans in proper operating condition .
• Rotate fan wheel monthly and purge grease from bearings once every three months
• Cover unit with tarp to protect from dirt and moisture
(Note: do not use a black tarp as this will promote condensation)
• Energize fan motor once every three months
• Store belts flat to keep them from warping and stretching
• Store unit in location which does not have vibration
• After storage period, purge grease from fan bearings before putting fan into service
If storage of unit is in a humid, dusty or corrosive atmosphere, rotate the fan and purge the bearings once a
month . Improper storage which results in damage to the unit or components will void the warranty .
OWNER’S INFORMATION
The following summary highlights some important notes to help avoid premature failure and possible voidance
of warranty .
Product Overview
Greenheck ERCH Models integrated with a complete refrigerant system are designed with the purpose of being
a self-contained source for heating and cooling in both commercial and institutional applications . This is done in
a highly efficient manner through the use of a total enthalpy recovery wheel . The wheel allows the compressors
and cooling equipment to be downsized in the unit, therefore being more cost effective to operate . The DX
system comes fully charged from the factory with refrigerant and is ready for installation upon arrival .
The smaller tonnage units (4-9 tons) contain a single compressor, allowing for one stage of cooling . Larger units
(10-30 tons) come standard with two compressors . This allows for staging of compressors to meet a wider
range of outdoor air loads while reducing the amount of cycles per compressor .
Integral Components
All units are provided with an expansion valve, hermetic scroll compressor(s), liquid line filter drier, high
pressure manual reset cutout, low pressure auto-reset cutout, time delays for compressor protection, service/
charging valves, moisture indicating sight glass, and hot gas bypass . The compressors also come standard with
a crankcase heater for additional protection .