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Owner's Information
The following summary highlights some important
notes to help avoid premature failure and possible
voidance of warranty.
Product Overview
FHP Manufacturing RT Models integrated with a heat
pump system are designed with the purpose of being
a self-contained source for heating and cooling in
both commercial and institutional applications. This
is done in a highly efficient manner through the use
of a rotary air-to-air total enthalpy wheel called an
"energy wheel". The wheel allows the compressors
and cooling equipment to be downsized in the unit,
therefore being more cost effective to operate. The
heat pump system comes from the factory fully
charged with refrigerant and is ready for connection
to a water source upon arrival. The smaller tonnage
units (4-6 tons) contain a single compressor, allowing
for one stage of cooling. Larger units (8-30 tons)
come standard with two compressors and a split
airside coil. This allows for staging of compressors
to meet a wider range of outdoor air loads while
reducing the amount of cycles per compressor.
Subassemblies
The following subassemblies are used or are
optionally available in all models of the RT.
RT Coils
In the RT, there is only one coil that will be present
in every unit and that is the airside coil. The airside
coil is connected to the heat pump compressor(s)
and is the primary vehicle for heating and cooling
of the building. A reheat coil is optionally available
and is installed in the supply air stream adjacent to
the airside coil. The reheat coil is also connected
to the heat pump but is used only when the unit
is in cooling mode and its function is to control
humidity in the conditioned air stream. It does this by
reheating the chilled air coming from the airside coil
and then delivering the dehumidified air at a neutral
temperature to the space.
A hot water coil is available as an option and is used
for supplementary heat for the building. If present,
this coil will be installed in the supply airstream,
mounted vertically on the interior wall that separates
the supply air blower and motor from the airside coil
compartment.
Heat Pump
Airside Coil
Optional Hot Water
Coil Location
Optional Heat Pump
Reheat Coil
RT Dampers
There are four locations where dampers are optionally
installed. If an exhaust weatherhood is installed, a
gravity type damper is included with that fixture.
Optional dampers may be located in the air stream
and are always motorized. The exhaust damper and
outside damper are either "low leakage" or "insulated
low leakage". There is one additional optional damper
that permits 100% recirculation of exhaust air when
the Outdoor Air damper is closed and the Exhaust
Air Blower is off and is intended for use during
unoccupied conditions. It is located in a vertical
position on the interior wall separating the intake
airstream from the exhaust airstream.
Gravity Type
Exhaust Damper
Exhaust
Hood
Motorized Outdoor
Air Intake Damper
RT Energy Wheel
Every RT unit contains a rotary air-to-air total enthalpy
wheel known as an "energy wheel". The energy wheel
rotates through both the incoming air and the exhaust
air streams, removing both sensible (heat) energy and
moisture from one airstream and transferring it to the
other air stream. The energy wheel is incorporated
into a subassembly known as an "energy wheel
cassette". The energy wheel itself is comprised of
segments which can be removed for servicing or,
in many cases, the entire cassette can be removed.
The cassette consists of a rigid frame with bearings,
a motor and the energy wheel. It is constructed and
installed
to prevent
air leakage
Adjustable
Air Seals
around the
energy wheel,
forcing
the entire
airstream to
pass through
the wheel.
Drive Belt
Drive Pulley
Model RT Energy Recovery Unit
Motorized Exhaust
Air Damper
Electrical Box
Exhaust Air
Intake
Motorized Recirculating
Air Damper
Bearing Support
Label showing
cassette serial #
and date code
5
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