SECTION 2
– PRODUCT DESCRIPTION
INTRODUCTION
YORK Air-Cooled Modular Chiller and Heat Pump provide chilled water or (and) hot water for all air
conditioning applications using central station air handling or terminal units. They are completely self-
contained and are designed for outdoor (roof or ground level) installation. Each complete packaged
unit includes hermetic scroll compressors, a liquid cooler, air cooled condensers, a charge of
refrigerant R410A and a weather resistant microprocessor control center, all mounted on a welded
steel base.
The units are completely assembled with all interconnecting refrigerant piping and internal wiring,
ready for field installation.
Prior to delivery, the packaged unit is pressure-tested, evacuated, and fully charged with Refrigerant
R410A and oil. After assembly, a complete operational test is performed with water flowing through
the cooler to assure that the refrigeration circuit operates correctly.
The unit structure is heavy-gauge, galvanized steel. This galvanized steel is coated with baked-on
powder paint, which, when subjected to ISO 9227 500 hour, salt spray testing, yields a minimum ISO
10289 rating of “6”. Corrosion resistant wire mesh grills and lower panels are added to protect the
condenser coil from incidental damage and restrict unauthorized access to internal components.
All exposed power wiring is routed through liquid-tight, UV-stabilized, non-metallic conduit.
GENERAL SYSTEM DESCRIPTION
Compressor
The unit has fixed speed, hermetic, scroll compressors. High efficiency is achieved through a
controlled orbit and the use of advanced scroll geometry. The compressors incorporate a compliant
scroll design in both the axial and radial direction. All rotating parts are statically and dynamically
balanced. A large internal volume and oil reservoir provides greater liquid tolerance. Compressor
crankcase heaters are also included for extra protection against liquid migration.
Refrigerant Circuits
One or two independent refrigerant circuits are provided on each unit. Each circuit uses copper
refrigerant pipe formed on computer controlled bending machines to reduce the number of brazed
joints resulting in a reliable and leak resistant system.
Each circuit shall incorporate all components necessary for the designed operation including: a
suction accumulator, a liquid receiver, a four way reversing valve, service valves, a bi-flow electrical
expansion valve. Suction lines shall be covered with closed-cell insulation.
Evaporator (Heat Exchanger)
The compact, high efficiency Brazed Plate Heat Exchanger (BPHE) is constructed with 316 stainless
steel corrugated channel plates with a filler material between each plate. It offers excellent heat
transfer performance with a compact size and low weight, reducing structural steel requirements on
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
