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PART #461248
HEAT RECOVERY UNIT
WITH EVAPORATIVE COOLING
®
Models:
HRE-20, 45, 55, & 90
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
**WARNING**
DISCONNECT AND SECURE TO THE "OFF" POSITION ALL ELECTRICAL POWER TO THE UNITS
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 THE UNITS. FAILURE TO
COMPLY WITH THIS SAFETY PRECAUTION COULD RESULT IN PROPERTY DAMAGE, SERIOUS
INJURY OR DEATH.
Indirect Evaporative Cooler
(Exhaust/Scavenger Airstream)
Direct Evaporative Cooler
(Outdoor/Supply Airstream)
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Table of Contents
Related Manuals for Greenheck HRE-20
Summary of Contents for Greenheck HRE-20
- Page 1 HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING ® Models: HRE-20, 45, 55, & 90 INSTALLATION, OPERATION AND MAINTENANCE MANUAL **WARNING** DISCONNECT AND SECURE TO THE "OFF" POSITION ALL ELECTRICAL POWER TO THE UNITS PRIOR TO INSPECTION OR SERVICING. FAILURE TO COMPLY WITH THIS SAFETY PRECAUTION COULD RESULT IN SERIOUS INJURY OR DEATH.
-
Page 2: Table Of Contents
Storage ......2 General ......2 Installation . -
Page 3: Installation
Before hoisting into position, test lift to insure stability and balance. Avoid twisting or uneven lifting of the unit. Never lift units by weatherhoods. UNIT WEIGHTS (dry weights) Unit Size Approx. Weight (lbs) HRE-20 HRE-45 HRE-55 HRE-90 RECOMMENDED ROOF OPENING Model... -
Page 4: Roof Curb Mounting
LIFTING instructions on page 3 of this manual. Note, roof curbs fit inside Curb Outside Dimensions the unit base. Model 4. Install Duct Work HRE-20 Installation of all HRE-45 ducts should be HRE-55 done in accordance HRE-90 with SMACNA and AMCA guidelines. -
Page 5: Electrical
5. Control Power Transformer (24 VAC Secondary) 6. Energy Wheel Motor Transformer (230 VAC Secondary) (for HRE-20 & HRE-45 units with primary voltage greater than 230 Vac) 7. 24 VAC Terminal strip 8. Fuses for the control circuit, wheel drive transformer, and blower motors. -
Page 6: Service Clearances
SERVICE CLEARANCES / ACCESS PANEL LOCATIONS for Model HRE HRE-20, 45, 55, and 90 units require minimum clearances for access on all sides for routine maintenance. Filter replacement, drain pan inspection and cleaning, energy wheel cassette inspection, fan bearing lubrication and belt adjustment, are examples of routine maintenance that must be performed. -
Page 7: Evaporative Cooling Modules
Roof Curb Manual Shutoff Valve Indirect Evaporative Cooler (Exhaust/Scavenger Airstream) Direct Evaporative Cooler (Outdoor/Supply Airstream) Unit Size Media Pad Top Area HRE-20 HRE-45 HRE-55 HRE-90 holes or tears and the water standoff tube for blockage. 9. After all final adjustments are made,... -
Page 8: Water Control Options
WATER CONTROL OPTIONS FOR EVAPORATIVE COOLING Auto Drain and Fill with Freeze Protection This system will automatically drain the sump tank and fill it with fresh water at the field adjustable intervals, typically once every 24 hours. This flushes mineral build-up and debris from the tank to promote low maintenance and increase media pad life. -
Page 9: Trouble Shooting
TROUBLE SHOOTING FOR EVAPORATIVE MODULE Symptom Insufficient water volume or recirculation pump not operating Irregular water distribution on cooling media Scale and mineral deposit formation on face of media Water Carry-Over Inadequate cooling Excessive water discharge into drain Poor performance after cooling pad replacement Solution... -
Page 10: Maintenance
EVAPORATIVE COOLING MAINTENANCE Regularly scheduled maintenance is the key to peak performance, minimized cost, and extended life of the evaporative cooler. The following is a checklist of items that need to be looked at on a regular basis. The media should be checked for mineral and foreign material deposits that have built up. -
Page 11: Water Coil Recommendations
WATER COIL APPLICATION RECOMMENDATIONS Factory installed heating components are mounted down stream of the energy wheel (and direct evaporative cooler if supplied) on the supply air side of the unit. See FIGURE 10 for coil connection location. Coil connections are located external to the unit as shown. -
Page 12: Electric Heater Application/Operation
ELECTRIC HEATER APPLICATION/OPERATION Factory installed electric heaters can be provided for preheat and/or post-heat (see FIGURE 11). An electric preheater warms the outdoor air prior to the energy recovery wheel to prevent frosting on the wheel. An electric post-heater warms the air leaving the energy recovery wheel to a user specified discharge temperature. Electric heaters are available in 208, 230, or 460 Vac (refer to heater nameplate for voltage). -
Page 13: Frost Control Application/Operation
FROST CONTROL APPLICATION/OPERATION When outdoor air temperatures are extremely cold, moisture condensation and frosting on the energy recovery wheel is possible. Frost control is an optional feature that will prevent wheel frosting. Two options are available: 1) Timed Exhaust frost control and 2) Preheat frost control Timed exhaust frost control includes a thermostat (with probe) mounted in the supply air inlet compartment (see... -
Page 14: Economizer Application/Operation
ECONOMIZER APPLICATION/OPERATION The energy recovery wheel may be de-energized for the purpose of providing economizer (free cooling) operation. This can be achieved with a signal from a Temperature or Enthalpy sensor mounted in the supply air inlet compartment (see FIGURE 13). This Primary sensor will de-energize the energy wheel when the outdoor air temperature (factory default is 65°F) or enthalpy (factory default is the ‘D’... -
Page 15: Start Up Checks
START UP CHECKS DO NOT OPERATE ENERGY RECOVERY VENTILATOR WITHOUT THE FILTERS AND BIRDSCREENS INSTALLED. THEY PREVENT THE ENTRY OF FOREIGN OBJECTS SUCH AS LEAVES, BIRDS, ETC. DO NOT REMOVE ACCESS PANELS OR OTHER UNIT COMPONENTS WHILE STANDING ON A LADDER OR OTHER UNSTEADY BASE. -
Page 16: Fan Rpm
ENERGY RECOVERY WHEEL CAUTION: See **WARNING** on page 1 and 15 For the HRE-20 and HRE-45, open the access door marked "Energy Wheel Cassette Access". UNPLUG the wheel drive motor and remove the metal spacer. Then pull the cassette out halfway as seen in FIGURE 17. -
Page 17: Routine Maintenance
ROUTINE MAINTENANCE CAUTION: See **WARNING** on Page 1 and 15 Once the unit has been put into operation, a periodic maintenance program should be set up to preserve the reliability and performance. Items to be included in this program are: •... -
Page 18: Vibration
5. Mechanical Looseness 6. Faulty Belts 7. Drive Component Unbalance 8. Poor Inlet/Outlet Conditions 9. Foundation Stiffness FIGURE 19 TABLE 2 Internal Model Filter Size HRE-20 20 x 20 HRE-45 20 x 25 HRE-55 16 x 25 HRE-90 20 x 20 Quantity... -
Page 19: Coil Maintenance
WATER COIL MAINTENANCE CAUTION: See **WARNING** on Page 1 and 15 FILTERS Filters upstream of the coil should be checked regularly. If the filters are dirty, they should be cleaned or replaced. It is important that the coils stay clean to maintain desired airflow. See page 18 for more information on filter maintenance. -
Page 20: Energy Recovery Wheel Maint
ACCESSING ENERGY RECOVERY WHEEL For the HRE-20 and HRE-45, open the access door marked "Energy Wheel Cassette Access" (FIGURE 20). UNPLUG the wheel drive motor and remove the metal spacer. Then pull the cassette out halfway (FIGURE 21). The energy recovery wheel cassettes for model HRE-55 and HRE-90 do not slide out due to their size and weight. -
Page 21: Removing Wheel Segments
REMOVING THE ENERGY RECOVERY WHEEL SEGMENTS Model HRE-20, 45, 55, & 90 Steel retainers are located on the inside of the wheel rim (FIGURE 22). Push the retainer toward center of wheel, then lift up and away to release segments (FIGURE 23). -
Page 22: Parts List
PARTS LIST 1. Supply blower - Forward curved fan - Adjustable motor mount for belt tensioning - Adjustable sheaves for speed control 2. Vibrations isolators (quantity 4 per blower) - Neoprene 3. Energy recovery wheel cassette 4. Removable energy recovery wheel segments 5. -
Page 23: Unit Trouble Shooting
Symptom Possible Cause Blown fuse or open circuit breaker. Defective motor or capacitor. Blower Fails to Motor starter overloaded. Operate Electrical. Drive. Control power (24 Vac) wiring run is too long (resistance should not exceed 0.75 ohms). Motor Starters Incoming supply power is “Chatter”... - Page 24 Greenheck will not be responsible for any removal or installation costs. Due to continuing product development Greenheck has the right to change specifications without notice Copyright © 2002 Greenheck Fan Corp. Trouble Shooting Corrective Action Decrease fan speed.