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Greenheck HRE-20, Installation, Operation And Maintenance Manual, Page: 1 / 24

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**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.

PART #461248

READ AND SAVE THESE INSTRUCTIONS

®

HEAT RECOVERY UNIT

WITH EVAPORATIVE COOLING

Models:

HRE-20, 45, 55, & 90

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

Indirect Evaporative Cooler

(Exhaust/Scavenger Airstream)

Direct Evaporative Cooler

(Outdoor/Supply Airstream)

Summary of Contents for HRE-20

Page 1: ...Y 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 PART 461248 READ AND SAVE THESE INSTRUCTIONS HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING Models HRE 20 45 55 90 INSTALLATION OPERATION AND MAINTENANCE MANUAL Indirect Evaporative Cooler Exhaust Scavenger Airstream Direct Evaporative Coole...

Page 2: ...n 14 Auto Dry Cycle 14 Start Up Checks 15 Fan wheel 15 Fan RPM 16 Energy Recovery Wheel 16 Coils 17 Routine Maintenance 17 18 Belts 17 Motors 17 Blower Wheel and Fasteners 17 Vibration 18 Filters 18 Coil Maintenance 19 Energy Recovery Wheel Maint 20 Accessing Energy Recovery Wheel 20 Removing Wheel Segments 21 Cleaning Wheel Segments 21 Parts List 22 Unit Trouble Shooting 23 24 STORAGE When a unit...

Page 3: ...E OF ALL LIFTING LUGS IS MANDATORY WHEN LIFTING Lifting should only be done with all access doors closed to avoid damaging the unit To prevent damage to the unit cabinetry use spreader bars Spreader bars must be in position to stop cables from rubbing the frame or panels Before hoisting into position test lift to insure stability and balance Avoid twisting or uneven lifting of the unit Never lift ...

Page 4: ...ly by others Assembly instructions are included with the curb 2 Cut Roof Opening and Locate Curb Layout the unit roof opening such that the supply discharge exhaust inlet of the unit will line up with the corresponding ductwork refer to Recommended Roof Openings on page 3 Be sure to allow for the recommended service clearances Keep the supply inlet of the unit away from any other exhaust fans 3 In...

Page 5: ...t control power Control wire resistance should not exceed 0 75 ohms approximately 285 feet total length for 14 ga wire 455 feet total length for 12 ga wire If wire resistance exceeds 0 75 ohms an industrial style plug in relay should be added to the unit control center and wired in place of the remote switch between terminal blocks 2 and 3 on the control strip See FIGURE 5 Item 7 The relay must be...

Page 6: ...intenance that must be performed Blower and motor assemblies energy recovery wheel cassette coil and filter sections are always provided with a service door or panel for proper component access Clearances for component removal may be greater than the service clearances refer to FIGURES 6 and 7 below for these dimensions FIGURE 6 Wheel Cassette 2 in filters 2 in filters Exhaust Air Intake Electrica...

Page 7: ...e the media in 1 3 minutes If adequate flow rate is not achieved consult with the factory 7 The water bleed off rate will now need to be adjusted This measurement is 3 to 6 percent of the media flow rate The recommended flow rate is 11 2 to 2 GPM per square foot of media pad top area see table at right After the unit has been installed and running for two weeks the unit should be checked for miner...

Page 8: ...d below From the outlet on the drain valve run line to a suitable drain location 3 Run an unobstructed drain line from the sump overflow to the drain as shown below 4 Install Sump Drain Solenoid Valve C in the drain line from the sump as indicated below From the outlet on this drain valve run a line to a suitable drain location Note Water Supply Solenoid Valve A is not the same as the Drain Soleno...

Page 9: ...dia To prevent further trouble flush and clean the system more frequently C If this condition persists chemicals may need to be added Water pH should be maintained between 6 and 8 A Irregular water distribution on face of media see above B Average face velocity exceeds 650 fpm Decrease fan rpm and airflow C Localized face velocities exceeding 650 fpm Air filters or media face area is partially blo...

Page 10: ...as removed from the unit check to make sure that is not installed backwards If the media is installed backwards there will be large amounts of water carry over downstream of the evaporative cooler Continuous operation in this manner may cause serious damage and void the warranty 7 At the end of each cooling season the evaporative cooler should be thoroughly cleaned A dispersant and biocide consult...

Page 11: ...city periodically vent any air in coil 4 Water coils are not normally recommended for use with entering air temperatures below 40o F however the energy recovery wheel maintains a pre coil temperature higher than 40o F No control system can be depended on to be 100 safe against freeze up with water coils Glycol solutions or brines are the only safe media for operation of water coils with low enteri...

Page 12: ... will turn on If the first stage does not satisfy the set point the second stage will also turn on Post heaters Post heaters are standard as 4 stage step control Post heaters are not single point wired see ELECTRICAL CONNECTIONS page 5 The functionality of a 4 stage heater is the same as the 2 stage preheater above except it has an additional two stages of heat control Post heaters supplied with G...

Page 13: ...aches the thermostat setting the electric preheater will turn on and warm the air entering the energy wheel Testing Turn the thermostat as high as it will go The heater should turn on If it doesn t either put the supply side doors on or temporarily jumper the air pressure switch to avoid nuisance tripping of the pressure switch Remember to remove the jumper 13 A1 B1 15 16 18 A2 0 2 0 0 4 1 0 0 6 0...

Page 14: ...ture for economizer operation to begin Set the Override sensor to the desired temperature for economizer operation to end factory default is 65 F and 50 F respectively Enthalpy sensor with Override A factory installed 620 ohm resistor is connected across terminals SR and The Override sensor should be turned down below current temperature in unit Turn the unit on LED on the sensor should be off Che...

Page 15: ...hree phase units interchange any two power leads this can be done at the motor starter START UP CHECKS WARNING 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 ACCESS PANELS AND UNIT COMPONEN...

Page 16: ...osen all eight seal retaining screws These screws are located on the bearing support that spans the length of the cassette through the wheel center Tighten the screws so the air seals tug slightly on the sheet of paper COILS Leak test thermal system to insure tight connections Check pulleys and belts for proper alignment to avoid unnecessary belt wear noise vibration and power loss Motor and drive...

Page 17: ... MOTORS Motor maintenance is generally limited to cleaning and lubrication where applicable Cleaning should be limited to exterior surfaces only Removing dust and grease build up on the motor housing assures proper motor cooling Use caution and do not allow water or solvents to enter the motor or bearings Under no circumstances should motors or bearings be sprayed with steam water or solvents Grea...

Page 18: ...t FIGURE 19 Internal Model Filter Size Quantity HRE 20 20 x 20 2 HRE 45 20 x 25 3 HRE 55 16 x 25 6 HRE 90 20 x 20 8 VIBRATION Excessive vibration maybe experienced during initial start up Left unchecked excessive vibration can cause a multitude of problems including structural and or component failure The most common sources of vibration are listed below Many of these conditions can be discovered ...

Page 19: ...y from the fan and create an environment for odor and bacteria to grow and spread through the conditioned zone High pressure water 700 Psi or less may be used to clean coils with fin thickness over 0 0095 inches thick TEST THE SPRAY PRESSURE over a small corner of the coil to determine if the fins will withstand the spray pressure For coils with fragile fins or high fin density foaming chemical sp...

Page 20: ... by entering the unit through the Exhaust Blower access door WARNING Disconnect power to the unit before performing any type of service ACCESSING ENERGY RECOVERY WHEEL FIGURE 21 ROUTINE ENERGY RECOVERY WHEEL MAINTENANCE CAUTION See WARNING on Page 1 and 15 MAINTENANCE OF THE ENERGY RECOVERY WHEEL Annual inspection of the energy recovery wheel is recommended Units ventilating smoking lounges and ot...

Page 21: ...leaning is complete shake the excess water from the wheel or segments Dry wheel or segments before placing them back into the cassette Place wheel or segments back into cassette by reversing removal procedures DO NOT CLEAN ENERGY RECOVERY WHEEL SEGMENTS WITH WATER IN EXCESS OF 140 F DO NOT DRY ENERGY RECOVERY WHEEL SEGMENTS IN AIR IN EXCESS OF 140 F IMPORTANT PLACE RETAINERS BACK IN THE ORIGINAL P...

Page 22: ...luminum mesh filter 6 Optional exhaust weatherhood with birdscreen 7 Optional supply and exhaust air filter racks for 2 in pleated 30 efficient filters 8 Electrical control box standard features Single point power Disconnect interlocked with access door Motor starters for the supply blower exhaust blower and energy wheel motors 24 Vac control circuit with terminal strip 9 Supply air tempering opti...

Page 23: ... higher or lower than design If higher ductwork should be improved If lower fan rpm should be lower Blower rotation is incorrect Check rotation and reverse if necessary Motor voltage incorrect Check motor nameplate versus supplied voltage Motor horsepower too low See specifications and catalog for fan curves to determine if horsepower is sufficient Motor Over Amps Shorted windings in motor Replace...

Page 24: ...eded Air seals are too tight See Energy Recovery Wheel on page 16 Economizer sensors are operating Adjust temperature or enthalpy set points as needed No power to wheel motor Make sure wheel drive is plugged in Verify power is available Wheel drive belt Check for loose or broken belts Replace belts consult factory One or Both Blowers Turn Off Intermittently and Back on After About 2 Minutes Wheel ...

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