Design And Function - Johnson Controls SABROE WHC 2.1 Installation And Operating Manual

3. Design and function

The Sabroe WHC circulation system is designed to maintain optimum cooling water tempera-
ture on heat pumps and refrigeration compressors with water-cooled top and side covers. The
system ensures a constant cooling water temperature thus giving the compressor optimum op-
erating conditions. The system circulates water (or glycol) during both operation and standstill.
The Sabroe WHC circulation system is a complete system with built-in control. The system has
two functions:
• At standstill the water is circulated and heated in the circuit to prevent condensing of re-
frigerant in the compressor while at the same time keeping the oil in the compressor
crankcase warm for operation. The system ensures that the compressor is always
ready for start-up.
• During operation water is circulated and cooled in the circuit so that oil and discharge
temperatures do not exceed the fixed limits.
The system ensures optimum cooling water temperature and minimum water consumption.
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Fig. 1
Water circuit
The pump (Fig. 1, pos. 2) is running constantly, and it circulates the cooling water on the side
and top covers of the compressor both during standstill and operation. During standstill, the
heating element (Fig. 1, pos. 1) heats the cooling water in order to keep the compressor warm
and ready for operation. During operation the solenoid valve (Fig. 1, pos. 4) opens when the
cooling water temperature gets too high in order to let in new cooling water.
The check valve (Fig. 1, pos. 7) prevents the cooling water from bypassing the top cover cir-
cuit. The strainer (Fig. 1, pos. 8) prevents dirt from entering the system and the strainer (Fig. 1,
pos. 9) prevents scale from the top covers to block the solenoid valve (Fig. 1, pos. 4). If air en-
ters the system it can be purged from the purge valve (Fig. 1, pos. 10).
In the connection end, the system has two ball valves (Fig. 1, pos. 6) and two unions (Fig. 2,
pos. 7) so that the system can be drained and detached when the compressor is being
serviced.
Controls
The Sabroe WHC circulation system is equipped with a small controller. The controller regu-
lates the water temperature in the system during both standstill and operation.
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Design and function