Greenheck ERCH - Energy Recovery Unit with Packaged DX (468151) - Manual (Page 3)

3
Energy Recovery Unit with Packaged DX
BASIC OPERATION
The ERCH with Packaged DX units bring in
fresh, outdoor air and remove stale, exhaust
air . Prior to discharging the exhaust air, the
energy recovery wheel transfers energy
from the exhaust air to the outdoor air at an
efficiency of 70-80% . Simply put, this unit
preconditions the outdoor air to save money
on heating and cooling costs . These particular
units also have packaged DX cooling and
heating options available after the recovery
wheel to further condition the fresh air .
Energy Recovery Wheel
Optional
Heater
Conditioned Air
sent to space
DX Cooling
Coil
Outdoor
Air
Shutdown Operation
The scroll compressors in this unit are designed to compress gas refrigerant only . To prevent liquid refrigerant
from migrating into and damaging the compressors, each compressor is supplied with a crankcase heater . Prior
to starting the compressors, the heaters must have power to them for 24 hours . Power should never be cut to
these units unless the complete shutdown procedure is followed .
Proper shutdown procedure:
1) Turn off main power supply to the unit
2) Turn thermostat controls to “off” position
3) Restore main power supply to the unit
4) Wait 24 hours prior to turning the thermostat control to the “on” position
Low Ambient Operation
Low ambient operation can cause damage to the refrigerant system . A factory-installed temperature sensor
in the outdoor air intake prevents refrigerant system operation at ambient conditions below 55ºF . Crankcase
heaters will still be engaged provided the main power has not been disconnected . If cooling is desired at
ambient temperatures below 55ºF, economizer operation (wheel start/stop or wheel modulation) should be
employed .
Reduced Airflow – Pumping oil and liquid refrigerant
Lack of maintenance will lead to filters, condensing coils, and evaporator coils building up with dirt and
debris . As this occurs, the airflow through the unit will decrease . Cooling coils are sized to handle a particular
airflow volume . A reduction in airflow can cause the cooling coils to get too cold and may result in excessive
liquid refrigerant return to the compressors . The liquid refrigerant buildup in the compressors will displace the
necessary oil required for proper lubrication . The combination of these two events will significantly reduce the
life of the compressors .
To maintain the proper airflow and system efficiency, follow all procedures in the Maintenance section .
Safety Listing
The ERCH units are listed per ANSI/UL 1995, Heating and Cooling Equipment, and bear the ETL logo .
Environmental Concerns
This equipment contains R22 or R-410a refrigerant . Refer to label on
access door identifying the type of refrigerant in the unit .
R22 is a class II refrigerant that contains HCFC’s . If released, HCFC’s
may reduce the amount of ozone in the atmosphere . This ozone
depletion will result in less protection from the sun and therefore it
is critical to use every precaution necessary to minimize the amount
admitted to our environment .
When working with Greenheck’s fully charged refrigerant system, it is
strongly recommended that caution is undertaken during installation,
operation, and routine maintenance . This caution will help ensure
that minimal amounts of refrigerant are leaked into the atmosphere .
To comply to the U .S . Clean Air Act, anytime there is residual
refrigerant, the proper equipment shall be used and methods should be followed to reclaim the refrigerant so
that it can be recycled, reprocessed, or destroyed .
IMPORTANT!
Do not release refrigerant to the
atmosphere! If required service
procedures include the adding or
removing of refrigerant, the service
technician must comply with all
federal, state and local laws . The
procedures discussed in this manual
should only be performed by a
qualified EPA Certified Technician .
Exhaust Air
from building