Operating Concerns; Low Ambient Operation; Reduced Airflow; Environmental Concerns - Bosch FHP RT-20 Installation, Operation And Maintenance Manual

Operating Concerns

Low Ambient Operation

Care has been taken to ensure low ambient operation
does not 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 and airside
coils building-up with dirt and debris. As this occurs,
the airflow through the unit will decrease. Airside coils
are sized to handle a particular airflow volume and a
reduction in airflow can cause the airside coils to get
too cold. As this happens, ice buildup on the face
of the coil is possible, further reducing airflow. The
result of the airside coil operating at temperatures
below design limits, is that excessive liquid refrigerant
will be returned to the compressor(s). The liquid
refrigerant buildup in the compressor(s) will displace
the necessary oil needed for proper lubrication. The
combination of these two events will significantly
reduce the life of the compressor(s) and could result
in compressor failure.
To maintain the proper airflow and system efficiency,
follow all procedures in the Maintenance section.

Environmental Concerns

This equipment contains R-410A refrigerant. It
provides performance similar to that of R-22
refrigerant, but it offers a great advantage. It is an
HFC refrigerant and does not contain any ozone
depleting HCFC's or CFC's. When working with
FHP fully charged refrigerant systems, it is strongly
recommended that caution is undertaken during
installation, operation, and routine maintenance.
Systems using R-410A refrigerant operate at
significantly higher pressures and R-22 service
equipment or components should not be used on
R-410A refrigerant systems. To comply with 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.
8 Model RT Energy Recovery Unit
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.
CAUTION
Unit is designed for outdoor or indoor installation.
Follow all guidelines in this manual for proper
installation.