Sinclair SCV-EB Series Service Manual page 12

Legend
1 Compressor
2 Discharge temperature sensor(Tp)
3 High pressure switch
4 4-way valve
5 Ambient temperature sensor(T4)
6 Air side heat exchanger
7 Fan
8 Air side heat exchanger temperature sensor(T3)
9 Strainer
10 Capillary
11 Electronic expansion valve
12 Refrigerant liquid pipe temperature sensor(T2)
13 Accumulator cylinder
14 Plate heat exchanger
Key components:
1. Accumulator cylinder:
Stores liquid refrigerant and oil to protect compressor from liquid hammering.
2. Electronic expansion valve (EXV):
Controls refrigerant flow and reduces refrigerant pressure.
3. Four-way valve:
Controls refrigerant flow direction. Closed in cooling mode and open in heating mode. When closed, the air side heat
exchanger functions as a condenser and water side heat exchanger functions as an evaporator; when open, the air
side heat exchanger functions as an evaporator and water side heat exchanger function as a condenser.
4. High and low pressure switches:
Regulate refrigerant system pressure. When refrigerant system pressure rises above the upper limit or falls below the
lower limit, the high or low pressure switches turn off, stopping the compressor.
5. Air purge valve:
Automatically removes air from the water circuit.
6. Pressure relief valve:
Prevents excessive water pressure by opening at 43.5 psi (3 bar) and discharging water from the water circuit.
7. Expansion vessel:
Balances water system pressure. (Expansion vessel volume: 5L)
8. Water flow switch:
Detects water flow rate to protect compressor and water pump in the event of insufficient water flow.
9. Water pump:
Circulates water in the water circuit.
10
15 Refrigerant gas pipe temperature sensor(T2B)
16 Pressure sensor
17 Suction temperature sensor(Th)
18 Low pressure switch
19 Water outlet temperature sensor(Tw_out)
20 Water inlet temperature sensor(Tw_in)
21 Expansion vessel
22 Pump
23 Pressure relief valve
24 Air purge valve
25 Water flow switch
26 Water outlet
27 Water inlet