the job site.
The heat exchanger is manufactured in a precisely controlled vacuum-brazing process that allows the
filler material to form a brazed joint at every contact point between the plates, creating complex
channels.
The units with two refrigerant systems use dual circuit BPHEs. Asymmetric channels provide optimal
efficiency in the most compact design. This results in low refrigerant charge or lower pressure drop
on the water or brine side. The asymmetry guarantees the best performance in both full and partial-
load conditions. The integrated distribution system ensures an even distribution of the refrigerant
throughout the plate package.
The refrigerant side design working pressure of the heat exchanger is 45 bar and the waterside (piping)
design working pressure is 10 bar.
The cooler is covered with 7/8” (19mm) flexible, closed-cell, foam insulation.
Installing contractor must include accommodations in the chilled water piping to allow proper drainage
and venting of the heat exchanger. Water inlet and outlet connections are grooved for compatibility
with factory supplied victaulic connections (except 65 kW unit with thread connections).
A strainer with a mesh size 0.3 mm (50 mesh) is recommended upstream of the heat exchanger to
prevent clogging.
A factory-wired flow switch is standard, installed in a pipe section at the outlet of the evaporator.
Condenser
Coils – Fin and tube condenser coils of seamless, internally-enhanced, high-condensing-coefficient,
corrosion resistant copper tubes are arranged in staggered rows, mechanically expanded into
hydrophilic aluminum fins. The design working pressure of the coil is 45 bar (650 PSIG).
Fans – The condenser fans are designed for maximum efficiency with two-staged fan motor. The fans
are positioned for vertical air discharge. All blades are statically and dynamically balanced for
vibration-free operation. The fan grilles are constructed of heavy-gauge, rust-resistant, coated steel.
AC Motors – The fans are directly driven by two-staged motors. Thermal loading protection is
integrated. They feature ball bearings that are double-sealed and permanently lubricated.
POWER PANEL
The control elements are fitted in a factory installed and wired IP55 rain/dust tight, powder painted
steel cabinets with tool lockable, hinged, latched, and gasket sealed outer doors. Main power
connection(s), compressor starters, fan motor contactors, current overloads are provided and factory
wired.
A unit-mounted Circuit Breaker with external lockable handle shall be provided at the point of incoming
single point connection for field connection, interconnecting wiring to the compressors, and isolating
the power voltage for servicing. Incoming power wiring must comply with local codes. Circuit breaker
shall be sized to provide the motor branch circuit protection, short circuit protection and ground fault
protection for the motor branch-circuit conductors, the motor control apparatus and the motors.
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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