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WSHP-PRC001-EN 91
Water-to-Refrigerant
Heat Exchanger
The water-to-refrigerant heat ex-
changer shall be of a high quality
co-axial coil for maximum heat trans-
fer. The copper or optional cupro-nick-
el coil shall be deeply fluted to
enhance heat transfer and minimize
fouling and scaling. The coil shall have
a working pressure of 400 psig on both
the refrigerant and water sides. The
factory shall provide rubber isolation
to the heat exchanging device to en-
hance sound attenuation.
Indoor Fan
The blower shall be a forward-curved
style wheel with four speed combina-
tions, or nine blower motor/sheave
combinations available.
All direct drive motors shall have
sealed bearings that do not require
field lubrication.
Options of the blower motor/fan pack-
ages shall be selected and wired from
the factory to match performance cri-
teria suggested in the performance
section. The motor shall contain a
quick disconnect plug for service, con-
vertibility and safety precautions.
The fan(s) shall be placed in a
draw-through configuration. They
shall be constructed of corrosion resis-
tant galvanized material.
Electrical
The unit control box shall contain all
necessary devices to allow heating
and cooling operation to occur from a
remote wall thermostat. These devices
shall be as follows:
• 24 VAC energy limiting class II
50 VA (minimum) transformer
• 24 VAC blower motor relay
• 24 VAC compressor contactor for
compressor control
• Field thermostat connections shall
be provided for ease of hook-up to
a terminal strip located in the
unit’s control box
• Lockout relay which controls cy-
cling of the compressor shall be
provided to protect the compres-
sor during adverse operating con-
ditions. The device may be reset
by interrupting power to the 24
VAC control circuit. Reset may be
done either at a remote thermo-
stat or through a momentary main
power interruption
• A high pressure switch shall pro-
tect the compressor against oper-
ation at refrigerant system
pressures exceeding 395 psig.
• The low-water temperature switch
or sensor shall prevent the com-
pressor operation with leaving
water temperatures below 20 F.
• Factory installed wire harness shall
be available for the Basic, Deluxe,
ZN510 and ZN524 control packag-
es.
Nameplate information shall be pro-
vided for the application of either
time-delay fuses or HACR circuit
breakers for branch circuit protection
from the primary source of power.
Basic Controls (option)
The basic control package shall con-
tain a low and high pressure switch
along with a compressor lockout relay
for control assistance. High voltage
power connections shall be made at
the equipments contactor. An optional
condensate overflow detection device
shall be made available with this con-
trol package. Each device shall be fac-
tory mounted, wired, and tested in the
equipment.
Deluxe Controls (option)
The deluxe control package shall pro-
vide a 75 VA transformer with circuit
breaker. The controller shall include a
lockout relay, anti-short cycle com-
pressor protection, random start de-
lay, brown-out protection, low
pressure time delay, compressor de-
lay on start and an open relay for night
setback or pump request. Optional
wiring from the factory for night set-
back, condensate overflow, hot gas re-
heat, electric heat, and compressor
enable shall also be provided. Three
LEDs (light emitting diodes) shall also
be included for diagnostics of the
equipment.
Tracer ZN510 or ZN524 Controller
(option)
This system shall utilize factory fur-
nished and mounted DDC controls for
operation of up to 120 units on a
Comm 5 (LonMark) link. The Tracer
ZN510 control package shall include a
75 VA transformer. The controller shall
provide random start delay, heating/
cooling status, occupied/unoccupied
mode, fan status and filter mainte-
nance options. Optional wiring from
the factory for condensate overflow
shall be available. Three LEDs (light
emitting diodes) shall be included for
diagnostics of the equipment.
The ZN510 shall be capable of a stan-
dalone application, or as applied to a
full building automation installation.
Mechanical
Specifications