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General Installation Information cont.
Duct System
Duct flanges are provided on side air discharge units
to facilitate a duct connection. A flexible connector
is recommended for discharge and return air duct
connections on metal duct systems. Seal, insulate, and
weatherproof all external ductwork. Seal, insulate and
cover with a vapor barrier all ductwork passing through
unconditioned spaces.
If the unit is to be connected to existing ductwork, check
the duct system to ensure that it has the capacity to
accommodate the air required for the unit application. If
the duct is too small, as in the replacement of heating only
systems, larger ductwork should be installed. All existing
ductwork should be checked for leaks and repaired if
necessary.
The duct system should be sized to handle the design
airflow quietly and efficiently. To maximize sound
attenuation of the unit blower, the supply and return
plenums should include an internal duct liner of fiberglass
or constructed of ductboard for the first few feet. On
systems employing a sheet metal duct system, canvas
connectors should be used between the unit and the
ductwork. If air noise or excessive airflow is a problem, the
blower speed can be changed.
Air Filter
Air filters are to be field installed either in the return air
openings in the structure or in a filter rack before the unit.
Unit should not be run without filters installed. The heat
pump is not supplied with a filter rack.
NOTE: DO NOT OPERATE THE UNIT WITHOUT AN AIR
FILTER.
Water Piping
The proper water flow must be provided to each unit
whenever the unit operates. To assure proper flow, use
pressure/temperature ports to determine the flow rate.
Units with the flow center option have two P/T ports
installed. Units with water valves do not come equipped
with P/T ports and will have to be field installed. The
ports should be located at the supply and return water
connections on the unit. The proper flow rate cannot
be accurately set without measuring the water pressure
drop through the refrigerant-to-water heat exchanger.
SCH80PVC, copper, flexible hose, or PE pipe are
recommended for unit connections.
Never use flexible hoses smaller than 1-inch inside diameter
on the unit. Limit hose length to 10 feet per connection.
Check carefully for water leaks.
AFFINITY SERIES OUTDOOR PACKAGED HEAT PUMP INSTALLATION MANUAL
Water Quality
It is the responsibility of the system designer and installing
contractor to ensure that acceptable water quality is
present and that all applicable codes have been met in
these installations. Failure to adhere to the guidelines in
the water quality table could result in loss of warranty.
In ground water situations where scaling could be heavy
or where biological growth such as iron bacteria will be
present, a closed loop system is recommended. The heat
exchanger coils in ground water systems may, over a period
of time, lose heat exchange capabilities due to a buildup
of mineral deposits inside. These can be cleaned, but only
by a qualified service mechanic, as special solutions and
pumping equipment are required.
Heat pumps with cupronickel heat exchangers are
recommended for open loop applications due to the
increased resistance to build-up and corrosion, along with
reduced wear caused by acid cleaning.
Water Treatment
Do not use untreated or improperly treated water.
Equipment damage may occur. The use of improperly
treated or untreated water in this equipment may result
in scaling, erosion, corrosion, algae or slime. Purchase of
a pre-mix antifreeze could significantly improve system
reliability if the water quality is controlled and there are
additives in the mixture to inhibit corrosion. There are
many examples of such fluids on the market today such
as Environol™ 1000 (pre-mix ethanol), and others. The
services of a qualified water treatment specialist should be
engaged to determine what treatment, if any, is required.
The product warranty specifically excludes liability for
corrosion, erosion or deterioration of equipment.
The heat exchangers and water lines in the units are copper
or cupronickel tube. There may be other materials in the
buildings piping system that the designer may need to take
into consideration when deciding the parameters of the
water quality. If antifreeze or water treatment solution is
to be used, the designer should confirm it does not have a
detrimental effect on the materials in the system.
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