ClimaCool UCR Remote Air Cooled - Manual (Page 28)

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26
General
Factory-assembled and wired remote air cooled chiller.
Chiller consists of two compressors, one evaporator,
safety and operational controls. The modular remote
air cooled chiller shall incorporate one or more modules
with two independent refrigerant circuits. Modules shall
be capable of independent operation powered by a fi eld
installed fused disconnect switch (or equivalent module
circuit breaker) supplied by others, so that any one
module can be shut down for repair without interrupting
the remaining remote air cooled chiller modules in
operation.
Basic Construction
The frame design shall consist of heavy gauge galvanized
steel with 3 mil powder coat paint fi nish baked at 350°
for resilience in transport and installation. The module
must have a low center of gravity, detachable schedule
40 carbon steel pipe water headers, designed to connect
to adjacent modules through the use of 300PSI rated
grooved couplings, base with cutouts for forklifts
or pallet jacks and the frame must be designed to fi t
through a standard 36” doorway.
Refrigeration Circuit
All refrigeration circuits shall contain R-410A non-ozone
depleting HFC. Each independent circuit shall consist of
a scroll compressor, thermostatic expansion valve for
refrigerant metering, liquid line solenoid valve, liquid
receiver, refrigerant isolation valves, sight glass, fi lter
drier, and high and low pressure controls and safety
controls. The modular remote air cooled chiller bank
must be able to produce chilled water even in the event
of a failure of one or more refrigerant circuits.
Evaporator
Each evaporator shall be highly effi cient, refrigerant
to water, dual circuited, brazed plate heat exchangers
constructed of 316 stainless steel; designed, tested,
and UL stamped in accordance with ASME Section VIII
pressure vessel code for 650 psig working refrigerant
pressure. The evaporator heat exchanger shall be
mounted to eliminate the eff ect of migration of
refrigerant to the cold evaporation with consequent
liquid slugging on start-up. The evaporator shall be
mounted on two layers of noise attenuating rubber
isolation pads which also acts as a thermal barrier. The
evaporator shall be wrapped with ¾ inch closed cell
insulated blanket and closed cell insulation shall be
provided on suction side refrigerant tubing including
refrigerant to chiller heat exchanger to prevent
condensation.
Compressors
Each module shall contain two scroll compressors
independently circuited for redundancy. Each
compressor shall be mounted with rubber isolated
compressor mounts to the module base and each shall
include compressor overload protection, high discharge
pressure and low suction pressure cutouts.
Starter/Control Panel
Master Controllers shall be provided for individual
control as well as system integration. The control shall
consist of a simple two-conductor shielded daisy chain
connection to allow communication between modules
with minimal fi eld wiring. The remote air cooled
chiller control panel shall be a NEMA Type 1 enclosure
including: power distribution block, compressor fusing,
contactors, fi nger safe control fusing, transformer,
isolation relays, status and alarm relay, 16-bit
microprocessor master controller with built in native
Building Automation System (BAS) communication
protocols, (BACnet, LonWorks, Modbus and N2), status
indicating lights showing: 1) compressor operation
(on/off ), 2) unit alarm status, 3) power on, two toggle
switches to disable each individual compressor during
start-up or troubleshooting.
Condenser – Remote Air Cooled
Remote air cooled condensers shall be constructed
with galvanized steel casing, independent refrigeration
circuits, 1140 RPM direct drive propeller and copper
tube/aluminum fi n condenser coils. The condenser coils
shall have aluminum fi ns bonded to seamless copper
tubes in a fl oating tube arrangement to eliminate tube
sheet leaks with an aluminum fi n selection spacing of
8, 10, 12 or 14 fi ns per inch. The condenser shall have a
minimum of two refrigerant circuits, with single or dual
ball bearing direct drive fan motors and equipped with
PVC coated steel wire safety guards. Optional 540 or
830 rpm fan motors must be available for effi
ciency and/
or low noise criteria applications. The remote air cooled
condenser is to have a refrigerant design side working
pressure of 650PSIG, pressure fan cycling control
required for winter operation and fl ooded head pressure
control valve used in conjunction with fan cycling
for operation in areas with lower than 45°F ambient
operation. Custom built control panel to interface with
CoolLogic Control System.
Engineering Guide Specifi cations