Product data

57
4. The compressor will be mounted on computer-
selected vibration isolation springs to a large heavy
gage compressor mounting tray plate, which
is then isolated from the cabinet base with rubber
grommets for maximized vibration attenuation.
5. Compressor shall be located in an insulated
compartment away from airstream to minimize
sound transmission.
6. Compressor shall have thermal overload
protection.
7. The heat pumps shall be fabricated from heavy
gage galvanized steel with powder coat paint
finish. Both sides of the steel shall be painted
for added protection.
8. All units must have an insulated panel separat-
ing the fan compartment from the compressor
compartment.
9. Units with the compressor in the airstream are
not acceptable.
D. Fan and Motor Assembly:
1. Blower shall have inlet rings to allow removal of
wheel and motor from one side without remov-
ing housing.
2. The fan motor shall be 3-speed, permanently
lubricated, PSC (permanent split capacitor) type
with internal thermal overload protection.
3. The fan motor shall be isolated from the hous-
ing by rubber grommets.
4. The motor shall be permanently lubricated and
have thermal overload protection.
5. A special dehumidification mode shall be pro-
vided to allow lower airflows in cooling for bet-
ter dehumidification. The dehumidification
mode shall be selectable via a jumper on the
control board or may be controlled externally
from a humidistat.
6. Airflow/static pressure rating of the unit shall
be based on a wet coil and a clean filter in
place. Ratings based on a dry coil and/or no fil-
ter, or on an ESP (external static pressure) less
than 0.50 in. wg shall NOT be acceptable.
E. Refrigerant Circuit:
1. All units shall contain a Puron
®
refrigerant
(R-410A) sealed circuit including a high-effi-
ciency Copeland UltraTech™ single-stage com-
pressor designed for heat pump operation, a
thermostatic expansion valve for refrigerant
metering, an enhanced corrugated aluminum
lanced fin and rifled copper tube refrigerant to
air heat exchanger, reversing valve, coaxial
(tube-in-tube) refrigerant to water heat
exchanger, and safety controls, including a
high-pressure switch, low-pressure switch (loss
of charge), water coil low temperature sensor,
and air coil low temperature sensor.
2. Access fittings shall be factory-installed on high
and low pressure refrigerant lines to facilitate
field service.
3. Refrigerant metering shall be accomplished by
thermostatic expansion valve only.
F. Drain Pan:
1. The drain pan shall be constructed of epoxy
powder, painted, galvanized steel to inhibit cor-
rosion. This corrosion protection system shall
meet the stringent 1000-hour salt spray test per
ASTM B117. If plastic type material is used, it
must be HDPE (high-density polyethylene) to
avoid thermal cycling shock stress failure over
the lifetime of the unit.
2. Drain pan shall be fully insulated.
3. Drain outlet shall be located at pan as to allow
complete and unobstructed drainage of conden-
sate. Drain outlet for horizontal units shall be
connected from pan directly to FPT fitting. No
hidden internal tubing extensions from pan out-
let extending to unit casing (that can create
drainage problems) will be accepted.
4. The unit as standard will be supplied with solid-
state electronic condensate overflow protection.
A mechanical float switch will be used with the
WSHP Open multiple protocol controller
option.
5. Vertical units shall be furnished with a PVC slip
condensate drain connection and an internal
factory-installed condensate trap. If units with-
out an internal trap are used, the contractor is
responsible for any extra costs to field install
these provisions, and/or the extra costs for the
subcontractor to install these provisions.
G. Filter:
1. Units shall have a factory-installed 1 in. wide fil-
ter bracket for filter removal from either side.
Units shall have a 1 in. thick throwaway type
fiberglass filter.
2. The contractor shall purchase one spare set of
filters and replace factory shipped filters on
completion of start-up.
3. Filters shall be standard sizes. If units utilize
non-standard filter sizes, then the contractor
shall provide 12 spare filters for each unit.
H. Thermostatic Expansion Valve:
1. Expansion valves shall be dual port balanced
types with external equalizer for optimum
refrigerant metering.
2. Units shall be designed and tested for operating
ranges of entering water temperatures from
20 to 120 F.
3. Reversing valve shall be four-way solenoid acti-
vated refrigerant valve, which shall default to
heating mode should the solenoid fail to func-
tion. If the reversing valve solenoid defaults to
cooling mode, an additional low temperature