General Description; Introduction; General Specifications; Compressors - Johnson Controls CWP Manual De Instalación Y Mantenimiento

General Description

7 GENERAL DESCRIPTION

7.1 Introduction

The new range of chillers with water condenser, of
the series CWP, includes 13 different capacities, fit
for medium-sized residential, commercial and indus-
trial applications.
All these 13 options are available in three models:
CWP: "cold only", requires a cooling tower or a
h
dry cooler for heat dissipation purposes
CWP-RC: motoevaporanting unit, needs a remote
h
condenser for heat dissipation purposes
CWP-HP: heat pump, the hot water's outlet temper-
h
ature can reach 51°C (in heating mode), useful for
sanitary water.

7.2 General Specifications

These units are provided with cabinets made of
oven-painted galvanised sheet panels. These panels
are soundproof, thanks to deadening sleeve (option-
al), to ensure absolutely noiseless operation.
All units are factory-assembled and receive the nec-
essary charge of refrigerant and oil (except for
CWP-RCs, which are shipped with a nitrogen
charge) for compressors, so that they can be prompt-
ly installed. Every single unit is tested by making the
water circulate through the heat exchangers, in or-
der to check the performance of the refrigeration cir-
cuit.

7.3 Compressors

All compressors are of Scroll hermetic type, and the
motor is cooled by the sucked gas; they are provided
with an oil heater (except from 02 to 09 models).
The 02 to 21 models have a compressor, while the
25 to 30 models are equipped with two compres-
sors.
All compressors are mounted on rubber shock ab-
sorbers, so as to minimise the sound level and the vi-
bration transmission.

7.4 Refrigeration circuits

The refrigeration circuit is provided with a thermosta-
tic expansion valve, dehydrating cartridge filter,
sight glass with a colour-change humidity indicator,
HP and LP pressure switches, solenoid valve (CWP-
RC only).
The CWP-HP and CWP-RC feature also a 4-way
valve, a non-return valve and a liquid receiver.

7.5 Evaporator

The direct-expansion evaporator consists of a weld-
ed stainless steel plate-type heat exchanger.
The evaporator's standard accessories include a
closed-cell polyurethane sleeve, around which a re-
sistor is wrapped, to protect it against frost.

7.6 Condenser (except for CWP-RC)

The water-cooled condenser consists of a welded
stainless steel plate-type heat exchanger.
The CWP-HP models feature a wired, insulated resis-
tor which provides protection against frost.

7.7 Switchboard

All the electrical devices required to operate the unit
are housed inside a separate compartment, which
can be accessed from the front side of the appliance,
via a panel secured by lock screws.
The switchboard, manufactured to CE standards, in-
cludes the master disconnector with external handle
locked in the opening position, contactors and ther-
mal protections, fuses for the control circuit, chilled
water thermostat, electronic controller, HP and LP
pressure switch, antifreezing thermostat, timer (to
prevent frequent starts), ON/OFF switch and termi-
nal board.
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