Operation, cooling and hydraulic diagram. Heat pump unit YCSA-H 120/150
SAFETY/CONTROL DEVICES
A High pressure switch
B Low pressure switch
C Pressure transducer port (fan speed control,
defrost management, readout of condensing
pressure [cooling cycle], or of evaporating
pressure [heating cycle])
D Leaving water temperature sensor (anti-
freeze, 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 Four-way valve
10 Liquid receiver
11 Water pump
12 Automatic air bleed
13 Water tank antifreeze heater
14 Expansion vessel
15 Water tank
16 Charge valve
17 Drain valve
18 Water filter (not inside the unit)
19 Relief valve
20 Water pressure gauge
21 Pressure differential switch
22 Relief valve
Pipe connection with Schrader valve
For units with hydro kit only
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