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92 WSHP-PRC001-EN
Tracer ZN524 Controller (option)
The ZN524 controller shall utilize fac-
tory furnished and mounted DDC con-
trols for operation of up to 120 units on
a Comm 5 (LonMark) link. The Tracer
ZN524 control package shall include a
75 VA (minimum) transformer. The
controller shall provide random start
delay, heating/cooling status, occu-
pied/unoccupied mode, fan status and
filter maintenance options. Optional
wiring from the factory for condensate
overflow shall be available. Three
LEDs (light emitting diodes) shall be
included for diagnostics of the equip-
ment.
The ZN524 shall be capable of a stan-
dalone application, or as applied to a
full building automation installation.
With this controller, the unit shall be
capable of a hot gas reheat (for dehu-
midification), boilerless control for
electric heat, waterside economizing,
and support of variable speed pump
control applications.
Orifice Ring
Removal of the motor and fan wheel
for the 1/2 through 5-ton units shall be
made with the assistance of a factory
provided orifice ring device. This de-
vice shall attach the wheel and motor
to the fan housing in one assembly
providing single side service access.
Water Regulating Valve
Assembly (option)
The water regulating valve assembly
shall consist of a direct acting valve
and a reverse acting valve. The direct
acting valve shall open in response to
an increase in discharge pressure dur-
ing the cooling cycle. The reverse act-
ing valve shall open in response to a
decrease in suction pressure during
the heating cycle. Water regulating
valves shall be used where low flow,
or low or high fluid temperature condi-
tions exist. This accessory shall be
used with open-loop systems.
Economizing Coil (GEH option)
The waterside economizing package
shall be an external unit accessory
pre-piped and pre-wired ready for
turn-key installation to the unit. The
economizing coil shall be designed to
perform with the WSHP at unit mea-
sured flow rate of 80.6 F DB/66.2 F WB
with 45 F EWT.
All hydronic coils shall be of 5/8" cop-
per and aluminum plate fin combina-
tion. All coils shall be proof and leak
tested from the manufacturer. The
proof test shall be performed at 1.5
times the maximum operating pres-
sure and the leak test at the maximum
operating pressure.
A dual sloped non corrosive drain pan
shall be easily accessible and clean-
able for the hydronic economizing
coil.
An electronic two-position, 3-way
valve shall meter water flow to the
economizing coil during the econo-
mizing mode. It shall be factory set to
energize the economizing mode at
55 F, while simultaneously halting me-
chanical operation of the compressor.
Hanging brackets with rubber isola-
tion shall be provided for the horizon-
tal version of the economizing coil
option. The bracket design shall be the
same throughout the equipment.
Electric Heat (option)
Boilerless control electric heat shall be
factory wired and tested. It shall be
composed of a nichrome open wire
coil designed for 2-kW per unit ton.
The design consist of a single stage of
electric heat used as a primary heating
source when compressor lockout has
occurred due to the entering water
temperature falling below 55 F with an
adjustable range between 25 F to 60 F.
All power connections to the electric
heat shall be made in the equipment’s
control box.
Hot Gas Reheat (option)
Dehumidification shall be provided
through a hot gas reheat option. The
coil shall consist of 3/8"/1/2" copper
tubes mechanically expanded into
evenly spaced aluminum fins. All coils
shall be proof and leak tested. The
proof test must be performed at 1.5
time the maximum operating pressure
and the leak test performed at the
maximum operating pressure.
Ball Valves (option)
Ball valves shall be field installed be-
tween the unit and the supply and re-
turn lines of the loop to stop water
flow to the unit in a maintenance or
service situation.
Motorized Water Valve (option)
When extreme fluid temperature con-
ditions do not exist with an open loop
system, a motorized water valve shall
be applied to each water-source heat
pump. The motorized valve shall stop
flow to the unit, causing pressures to
rise. This rise in pressure will halt
pump operation to provide greater en-
ergy savings of the entire system.
Mechanical
Specifications