Functional Control ESIE98–06A
2–10 Part 2 – Functional Description
3
1
2
4
5
Defrost circuit
combination
EUWY15-30HC
When one of the circuits of chillers with more than one refrigeration circuit (EUWY15-30HC) performs
a defrost:
■ Circuits 2 and 3 will influence each other in such a way that one circuit is switched off when the
other circuit performs a defrost.
■ Circuit 1 will be independent of the other two.
Circuit layout The following table gives information concerning the horsepower per circuit:
Defrost
possibilities
The first column in the following table shows the circuits that are in defrost. The other columns describe
the status of the circuits:
D = the circuit performs a defrost
O = the circuit is switched off
C = the circuit continues its normal operation
Chiller type Circuit 1 Circuit 2 Circuit 3
15H 10 HP 5 HP —
20H 10 HP 10 HP —
25H 10 HP 10 HP 5 HP
30H 10 HP 10 HP 10 HP
Circuit(s) in defrost Circuit 1 Circuit 2 Circuit 3
circuit 1DCC
circuit 2CDO
circuit 3 C O D
circuit 1+3 D O D
circuit 1+2 D D O
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