Greenheck Fan HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 - Manual (Page 2)

2
TABLE OF CONTENTS
Storage and Basic Operation . . . . . . . . . . . . . .2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Unit Weights & Recommended Roof
Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Roof Curb Mounting . . . . . . . . . . . . . . . . . . . . .4
Rail Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Ductwork Connections . . . . . . . . . . . . . . . . . . .5
Electrical Information . . . . . . . . . . . . . . . . . . . 6-7
Service Clearances . . . . . . . . . . . . . . . . . . . . . .8
Dimensional Data/Access Door Description . .9
Evaporative Cooling Modules
Evap Module Installation and Start-Up . . 10-11
Water Supply Connection Location . . . . . . . .11
Water Control Options . . . . . . . . . . . . . . . . 12-13
Drain & Overflow Connection Locations . . . .14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . .15
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Optional Accessories . . . . . . . . . . . . . . . . . 17-28
Electric Heater Application/Operation . . . . . .17
Frost Control Application/Operation . . . . . . . .18
Economizer Application/Operation . . . . . . . . .19
Variable Frequency Drives . . . . . . . . . . . . 20-21 Typical Wiring Diagram . . . . . . . . . . . . . . . . . .22
Sensors and Lights . . . . . . . . . . . . . . . . . . 23-24
Remote Control Panel & Wiring . . . . . . . . 25-27
Sensors Mounted by Factory . . . . . . . . . . . . .28
Start-Up Checklist
Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-30
Evaporative Cooler . . . . . . . . . . . . . . . . . . . . .30
Optional Accessories . . . . . . . . . . . . . . . . . . . .31
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-33
Energy Recovery Wheel . . . . . . . . . . . . . . . . .34
Routine Maintenance Checklist . . . . . . . . . . .35
Belts and Motors . . . . . . . . . . . . . . . . . . . . . . .36
Blower Wheel and Fasteners . . . . . . . . . . . . .36
Bearings, Filters and Door Seal . . . . . . . . . . .37
Energy Recovery Wheel Maintenance . . . . .38
Accessing Energy Recovery Wheel . . . . . . . .38
Removing Wheel Segments . . . . . . . . . . . . . .38
Cleaning Wheel Segments . . . . . . . . . . . . . . .39
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Sequence of Operation . . . . . . . . . . . . . . . . . .41
Troubleshooting Airflow . . . . . . . . . . . . . . . . .42
Unit Troubleshooting . . . . . . .43 and Backcover
Warranty . . . . . . . . . . . . . . . . . . . . . . . . Backcover
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 .
BASIC OPERATION
The HRE brings in fresh, outdoor air and
removes stale, exhaust air . For summer
operation, the exhaust air flows through an
evaporative cooler (indirect) to lower the
air temperature . A sensible recovery wheel
transfers energy from the exhaust air to
the outdoor air at an efficiency of 70-80%
to reduce the temperature of the outdoor
air . The outdoor air can then flow thru an
optional evaporative cooler (direct) to further
reduce the temperature of the outdoor air .
The sensible wheel also recovers heat from
the exhaust in the winter to precondition the
outdoor air . Optional heaters are available
after the wheel for final tempering .
Outdoor Air
Exhaust Air
discharged outside
Exhaust Air
from building
Conditioned Air
sent to space
Optional
Heater
Sensible
Recovery
Wheel Indirect
Evaporative
Cooler
Direct
Evaporative
Cooler