Greenheck ERCH-20 Installation, Operation And Maintenance Manual Download Page 1

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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 instructions could result in personal injury and/or property damage!

Energy Recovery Ventilator with Heating and Cooling

1

®

Only qualified personnel should install this system. 
Personnel should have a clear understanding of these 
instructions and should be aware of general safety 
precautions. Improper installation can result in electric 
shock, possible injury due to coming in contact with 
moving parts, as well as other potential hazards, 
including environmental. Other considerations may be 
required if high winds or seismic activity are present. 
If more information is needed, contact a licensed 
professional engineer before moving forward.

1

.  Follow all local electrical and safety codes, as well as 

the National Electrical Code (NEC), the National Fire 
Protection Agency (NFPA), where applicable. Follow 
the Canadian Electrical Code (CE) in Canada.

2.  All moving parts must be free to rotate without 

striking or rubbing any stationary objects.

3.  Unit must be securely and adequately grounded.
4.  Do not spin fan wheel faster than maximum 

cataloged fan RPM. Adjustments to fan speed 
significantly affect motor load. If the fan RPM is 
changed, the motor current should be checked to 
make sure it is not exceeding the motor nameplate 
amps.

5.  Verify that the power source is compatible with the 

equipment.

6.  Never open access doors to the unit while it is 

running.

General Safety Information

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 may be 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.

WARNING

The roof lining contains high voltage wiring. To 
prevent electrocution, do not puncture the interior or 
exterior panels of the roof.

Document 476054

Model ERCH

Energy Recovery Ventilator

with Heating and Cooling 

Summary of Contents for ERCH-20

Page 1: ...thout striking or rubbing any stationary objects 3 Unit must be securely and adequately grounded 4 Do not spin fan wheel faster than maximum cataloged fan RPM Adjustments to fan speed significantly af...

Page 2: ...rage 3 Product Overview 4 Optional Subassemblies 4 Unit Installation 6 Electrical Installation 15 Piping Installation 18 Unit Overview 22 Optional Component Overview 22 Cooling System Overview 26 Unit...

Page 3: ...prevent condensation Remove any accumulations of dirt water ice or snow and wipe dry before moving to indoor storage To avoid condensation allow cold parts to reach room temperature Leave coverings l...

Page 4: ...many combinations of supplemental heating and cooling Heating sources include indirect gas electric hot water and water source heat pump Cooling sources include split direct expansion chilled water an...

Page 5: ...hat will be connected to a separate condensing unit provided by others Depending on controlling options the condensing unit will be controlled by others or an integral unit microprocessor controller P...

Page 6: ...7 21 7 2325 Cooling Coil 104 3 2725 WSHP 3775 Evap Cooling 2900 ERCH 55 Heating Only 97 5 75 2 71 23 6 21 7 3000 Cooling Coil 116 5 3475 WSHP 4725 Evap Cooling 3325 ERCH 90 Heating Only 109 5 94 5 89...

Page 7: ...eating Only 93 1 70 8 38 3 63 5 41 8 12 3 184 207 9 3 10 7 Cooling Coil 112 1 70 8 32 8 196 228 10 1 11 9 WSHP NA NA NA Evap Cooling 38 3 ERCH 90 Heating Only 105 1 90 1 39 1 79 4 51 1 12 3 231 254 11...

Page 8: ...odel A in B in ERCH 20 48 36 ERCH 45 64 42 ERCH 55 42 42 ERCH 90 42 48 Service Clearances Access Panel Heating Only Units require minimum clearances for access on all sides for routine maintenance Fil...

Page 9: ...provided with a service door or panel for proper component access EXHAUST FILTERS OUTDOOR AIR FILTERS WHEEL CASSETTE OUTDOOR WEATHERHOOD COOLING COIL INDIRECT GAS FURNACE ELECTRICAL BOX HEATING COIL A...

Page 10: ...nd motor assemblies energy recovery wheel cassette coil and filter sections are always provided with a service door or panel for proper component access EXHAUST FILTERS OUTDOOR AIR FILTERS EXHAUST AIR...

Page 11: ...and filter sections are always provided with a service door or panel for proper component access EXHAUST FILTERS OUTDOOR AIR FILTERS EXHAUST AIR WEATHERHOOD WHEEL CASSETTE OUTDOOR WEATHERHOOD INDIRECT...

Page 12: ...ok Adequate space should be left around the unit for piping coils and drains filter replacement and maintenance Sufficient space should be provided on the side of the unit for routine service and comp...

Page 13: ...rk Installation of all ducts should be done in accordance with SMACNA and AMCA guidelines Duct adapter provided to support ducts prior to setting the unit 4 Set the Unit Lift unit to a point directly...

Page 14: ...8 x 30 38 x 30 RIB 30 x 36 SDB 16 x 18 18 x 20 RIT 30 x 40 EDE 20 x 20 28 x 28 EDT 20 x 20 28 x 28 EDS 20 x 20 28 x 28 ERCH 90 Recommended Duct Size Intake Duct Size Discharge 15 15 Blower 18 18 Blowe...

Page 15: ...ne the Size of Electric Heater Wiring An optional electric heater may require a separate power supply The power connection should be made to the factory provided electric heater disconnect and must be...

Page 16: ...ch and system access panels When providing or replacing fuses in a fusible disconnect use dual element time delay fuses and size according to the rating plate Discharge Air Temperature Sensor Without...

Page 17: ...C NO SUPPLY DIRTY FILTER SWITCH EXHAUST DIRTY FILTER SWITCH DIRTY FILTER HOT COMMON 24V SEC Dirty Filter Indicator powered by others UNIT ON OFF COOL STAGE 1 ECONOMIZER COOL STAGE 2 HEAT UNOCCUPIED R...

Page 18: ...Failure to replace grommets will result in water leakage into the unit and altered performance 3 Water coils are not normally recommended for use with entering air temperatures below 40 F No control s...

Page 19: ...Practices and all codes In some climates it will be necessary to provide freeze protection for the P trap and drain line The P trap should be kept filled with water or glycol solution at all times an...

Page 20: ...the lines from freezing IMPORTANT The supply line should be of adequate size and pressure to resupply the amount of water lost due to bleed off and evaporation The drain line should be the same size...

Page 21: ...y Connection Locations for Evaporative Cooler SUPPLY FILTERS WHEEL CASSETTE ELECTRICAL BOX INDIRECT EVAP DIRECT EVAP C D A B RETURN AIR INTAKE OUTDOOR AIR INTAKE EXHAUST FILTERS Run 1 4 in line throug...

Page 22: ...5 grains lb Return Air 75 F 50 RH Exhaust Air Outdoor Air 10 F 5 grains lb Supply Air 60 F 39 grains lb Return Air 72 F 40 RH Optional Component Overview Economizer The energy wheel operation can be a...

Page 23: ...the outdoor air temperature is less than 5 F AND the pressure differential is greater than the set point the wheel will run at reduced speed until the pressure differential falls below the set point...

Page 24: ...Vapor Tight Lights Vapor tight lights provide light to each of the compartments in the energy recovery unit The lights are wired to a junction box mounted on the outside of the unit The switch to turn...

Page 25: ...for high temperature exhaust applications Airflow Monitor A factory wired mounted and powered airflow monitoring system is provided in the outdoor and or exhaust air streams The airflow control syste...

Page 26: ...by first removing the cap on the bottom of the valve and then turning the adjusting stem clockwise to increase the setting pressure counterclockwise to decrease Allow several minutes between adjustme...

Page 27: ...ssor Allow 5 minutes between on cycles to prevent compressor damage Prior to starting up the unit power must be energized for 24 hours without a call for cooling to allow the compressor crankcase heat...

Page 28: ...t Up Checklist o Disconnect and lock out all power switches o Remove any foreign objects that are located in the energy recovery unit o Check all fasteners set screws and locking collars on the fans b...

Page 29: ...be between 8 and 12 F Water In Water Out Hot Gas Bypass Operational Yes No Yes No Yes No Yes No Yes No Suction Pressure Set Point Compressor Sight Glass Oil Level Oil Foaming Yes No Yes No Yes No Yes...

Page 30: ...rty Filter Sensor Yes No N A Yes No CO2 Sensor Yes No N A Yes No Service Outlet Yes No N A Yes No Vapor Tight Lights Yes No N A Yes No Remote Control Panel Yes No N A Variable Frequency Drives Section...

Page 31: ...g the wheel access door slightly Remove filters if necessary to observe the wheel Fans The unit contains a forward curved supply fan and a forward curved exhaust fan These forward curved fans should b...

Page 32: ...rs must be installed except the control center door WARNING Do not operate units with access doors open or without proper ductwork in place as the fan motors will overload Model Blower Diameter x Widt...

Page 33: ...OAT SP The set point for low temperature economizer lockout This is the low temperature set point when AUX1 O is set to ERV Set point menu default 32 F 7 STG3 DLY Time delay after second cooling stage...

Page 34: ...el pressure switch in the preheat control center 3 Jumper the temperature indicating thermodisc in the preheat control center Thermodisc has a pre set temperature of 5 F 4 Apply power to unit Preheate...

Page 35: ...of the power resets the manual override values that were set during the calibration Outdoor Airflow Monitor For additional information on how to navigate through the airflow controller menus refer to...

Page 36: ...e Float Turn on the water supply and allow the sump tank to fill Adjust the float valve to shut off the water supply when the sump is filled to within one inch of the bottom of the overflow 4 Break In...

Page 37: ...to 2 Then go to A1 03 and change it to 1110 and press enter The drive is now reset back to the settings programmed at Greenheck This option is not available on the J1000 MA MB MC RP H1 SC HC S7 S6 S5...

Page 38: ...Function 5 5 H3 10 A2 Not Used F NA L4 01 H2 01 Frequency Detection 15 15 L5 01 Auto Restart Attempt 5 5 A1 01 Access Level 0 0 Variable Frequency Drives for Energy Recovery Wheel Parameter Setting J1...

Page 39: ...ons and then establish a maintenance schedule that is appropriate for the installation The following is provided as a guideline Maintenance Frequency Monthly 1 External Filter Clean metal mesh filters...

Page 40: ...s the belt deflection should be one inch using moderate thumb pressure at mid point of the drive Check belt tension two times during the first 24 hours of operation and periodically thereafter Fan Mot...

Page 41: ...th a high strength acrylic adhesive is installed on the door frame of the unit This creates and air tight seal between the rubber seal and the door Inspect at least annually to ensure that the seal is...

Page 42: ...be closed as soon as possible If the wheel should rotate when a clip is open the clip will jam against the bearing support bar and could cause damage Cleaning Maintenance or cleaning of the wheel seg...

Page 43: ...f 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 di...

Page 44: ...damper linkage or replace damper motor System static pressure too high Improve ductwork to eliminate losses using good duct practices Blower speed too low Check maximum motor RPM and compare with cata...

Page 45: ...air Replace fuse after correcting problem Low line voltage Check line voltage If more than 10 from compressor marking correcting is necessary Compressor motor protector open Motor thermal protector au...

Page 46: ...cool for two hours Recheck for open circuit Improper refrigerant charge Check subcooling Improperly wired Review wiring schematics Loose wiring Check all connections Defective start relay Replace rel...

Page 47: ...ble in system Remove non condensable from system High load conditions Add more equipment or reduce load Low suction pressure Refrigerant undercharge loss of refrigerant charge Check pressures and subc...

Page 48: ...utdoor temperature Restriction in suction and liquid line Check for restrictions in refrigerant circuit Control contacts stuck Check wiring Excessive load Add more equipment or reduce room load Liquid...

Page 49: ...a To prevent further trouble flush and clean the system more frequently Header partially clogged Check water flow across the face of the media Irregular water distribution must be corrected see above...

Page 50: ...stallation Pad installed backwards To get the performance from the cooling pads they must be installed properly The pads are manufactured with 15 45 degree flute angles The pads must always be install...

Page 51: ...faults and will go into alarm shutting down the unit or a single function within the unit Microprocessor Controller Check the screen on the microprocessor for an alarm condition If it is in alarm cond...

Page 52: ...out Compressor 2 4 Low pressure lockout Compressor 2 5 Freeze sensor lockout optional item 6 Condensate overflow in coil drain pan optional item 7 Brownout AC voltage to R and C terminal below 18 VAC...

Page 53: ...15 6 0 6 0 6 0 6 0 8 0 Dimensions are in inches Dimensions B and D are not needed for standard venting A B C D COMBUSTION AIR INLET EXHAUST OUTLET Bottom Venting Location Top Venting Location Housing...

Page 54: ...______________________________________ _________________________________________________ _________________________________________________ Date____________________Time______________ AM PM Notes ______...

Page 55: ...______________________________________ _________________________________________________ _________________________________________________ Date____________________Time______________ AM PM Notes ______...

Page 56: ...ment fan performance available accessories and specification data As a result of our commitment to continuous improvement Greenheck reserves the right to change specifications without notice Specific...

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