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RT Filters
There are three locations in the RT where filters will be
found. In the Outdoor Air Intake, there are permanent
metal filters that are accessed by removing the filter
access panel on the side of the louver assembly. The
metal filters require regular cleaning, see Routine
Maintenance section of this manual.
In the outdoor air intake portion of the RT, a set of
2-inch thick MERV 8 or MERV 13 pleated filters are
used. These filters are located directly in front of the
energy wheel cassette and require frequent inspection
and periodic replacement. See Routine Maintenance
section of this manual.
In the exhaust air intake stream there is an additional
set of 2-inch thick MERV 8 or MERV 13 pleated filters.
These filters are located between the exhaust air
intake and the energy wheel cassette. See Routine
Maintenance section of this manual.
Exhaust
Hood
Permanent Metal Filters
6
Model RT Energy Recovery Unit
Two-inch thick MERV 8 or
MERV 13 pleated filters
Electrical Box
Exhaust Air
Intake
RT Heat Pump Module
Every RT has an integral heat pump module that
contains hermetic scroll-type compressor(s), a coaxial
refrigerant-to-water heat exchanger(s), refrigerant flow
reversing valve(s), expansion valve(s), liquid line filter
drier, high pressure manual reset cutout, crankcase
heater(s) and various sensors, service ports and
safety devices which allows the unit to run at less
than full capacity and results in fewer compressor
cycles. The heat pump is intended to be connected
to an external water source such as a water cooling
tower or boiler, a geothermal source or even a
ground loop. The module is piped to the airside coil
located in the intake airstream and optionally to a
reheat coil that will control humidity. The location
of components in the module will vary. Control
circuitry and the Unit Protection Module (UPM) for the
heat pump module are
located in the heat pump
module. The UPM is a
printed circuit board and
has LED fault indicator
lights to indicate various
alarm conditions and
also power status. A
unit-specific schematic
for electrical circuits is
located in the Control
Center and another unit-specific schematic for heat
pump circuitry is located in the heat pump module.
See also the Typical Refrigerant Flow Schematic in
this IOM.
In normal use, the heat pump module requires only
periodic inspection and cleaning. Any servicing
or repairs must be performed by an EPA Certified
Technician.
High
Efficiency
Scroll Type
Compressors
Coaxial
Refrigerant-
to-Water
Heat
Exchangers
RT Heat Pump Module
Unit Protection Module
(UPM)
Refrigerant
Reversing
Valves
Water
Intake and
Discharge
Connections
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