11
Operation, cooling and hydraulic diagram. Cool only unit YCSA 120/150
Heat exchange takes place between the heat transfer liquid
(water or glycol water) and the refrigerant in the plate heat
exchanger. Water is cooled, and refrigerant is evaporated
and reheated.
Then the Scroll compressor condenses the refrigerant (gas)
until the condensing pressure is reached, and the refriger-
ant goes to the air cooled condensing unit. In the air cooled
condensing unit, heat is exchanged between the air and
the refrigerant. The air is heated and evacuated from the
chiller (heat rejection). The refrigerant is condensed and sub-
cooled. Then the refrigerant (liquid) goes on to the expansion
valve, where it is expanded until the evaporating pressure is
reached, at which time it goes to the evaporating unit to end
the cooling cycle.
SAFETY/CONTROL DEVICES
A High pressure switch
B Low pressure switch
C Pressure transducer port (fan speed
control - readout of condensing pres-
sure)
D Leaving water temperature sensor (an-
tifreeze, control and display)
E Entering water temperature sensor
(control and display)
COMPONENTS
1 Compressor (tandem)
2 Air cooled condenser
3 Filter-dryer
4 Sight glass
5 Expansion valve
6 Plate heat exchanger
7 Exchanger antifreeze heater
8 Globe valve
9 Water pump
10 Manual air bleed
11 Water tank antifreeze heater
12 Expansion vessel
13 Water tank
14 Charge valve
15 Drain valve
16 Water filter (not inside the unit)
17 Pressure differential switch
18 Relief valve
19 Pressure gauge
Pipe connection with Schrader
valve
For units with hydro kit only
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