29
E
n
g
li
sh
7
General Description
7.1 Introduction
The new range of water cooled chillers, includes 14 different
capacities, fit for medium-sized residential, commercial and industrial
applications.
All these 14 sizes are available in three versions:
Q
WQL: cooling only unit
, requires a cooling tower or a dry cooler
for heat dissipation purposes
Q
WQRC:
needs a remote condenser for heat dissipation purposes
Q
WQH: heat pump
, the hot water’s outlet temperature can reach
55°C (in heating mode), useful for sanitary water.
7.2 General Specifications
These units are provided with cabinets made of ovenpainted
galvanised sheet panels. These panels are soundproof, thanks to
deadening sleeve (optional), to ensure absolutely noiseless operation.
All units are factory-assembled and receive the necessary charge
of refrigerant and oil (except for WQRC, which are shipped with a
nitrogen charge) for compressors, so that they can be promptly
installed. Every single unit is tested by making the water circulate
through the heat exchangers, in order to check the performance of
the refrigeration circuit.
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. 20 to 45
models have a compressor, while the 50 to 190 models are equipped
with two compressors in tandem.
All compressors are mounted on rubber shock absorbers, so as to
minimise the sound level and the vibration transmission.
7.4 Refrigeration circuits
The refrigeration circuit is provided with a thermostatic expansion
valve, dehydrating cartridge filter, sight glass with a colour-change
humidity indicator, HP and LP pressure switches.
WQH units feature also a 4-ways valve and check valves in order to
always run expansion valve and filter in the same way.
WQRC units feature also a solenoid valve and a liquid receiver.
7.5 Evaporator
The direct-expansion evaporator consists of a welded stainless steel
plate-type heat exchanger.
The evaporator’s standard accessories include a closed-cell
polyurethane sleeve, and a water pressure differential switch.
7.6 Condenser (except for WQRC)
The water-cooled condenser consists of a welded stainless steel
plate-type heat exchanger.
The condenser’s standard accessories include a closed-cell
polyurethane sleeve, and a water pressure differential switch.
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, includes the master
disconnector with external handle locked in the opening position,
contactors and thermal protections, fuses for the control circuit,
sequence phase controller, water sensor, electronic controller, HP
and LP pressure switch, timer (to prevent frequent starts), ON/OFF
switch and terminal board.
7 - General Description
