Functional Description ESIE11-02
2–18 Part 2 – Functional Description
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1.14 Defrost Management for EUWY*5-24KBZW1
Functional
description
The characteristics of the defrost management are the following:
■ The defrost function is only active in heating mode.
■ The defrost cycle can only be performed if the compressor is on.
■ When a defrost cycle is active in a circuit, the reversing valve of that circuit is switched.
■ When a defrost cycle is active, all the fans in circuit 1 and circuit 2 are switched off or run on
medium speed.
■ The defrost function is executed in the I/O PCB and there will be no defrost indication on the
controller.
■ If the defrost function for circuit 1 is active, circuit 2 is stopped by opening DO10.
■ If the defrost function for circuit 2 is active, circuit 1 is stopped by opening DO9.
■ Priority: when the defrost function is activated for the 2 circuits, only one of the circuits will
alternately be defrosted.
Illustration
dipswitches S2A
The illustration below shows the defrost dipswitches on the PCB.
Function
dipswitches S2A
The table below describes the function of the dipswitches on the PCB.
S2A Dipswitch
1 Defrost setting
0 = Start condition 1 & fan defrost 1 (5HP, 8HP, 16HP)
1 = Start condition 2A/B & fan defrost 2 (10HP, 12HP, 20HP, 24HP)
2 Fan setting
0 = Fan setting 1 (5HP, 8HP, 16HP)
1 = Fan setting 2 (10HP, 12HP, 20HP, 24HP)
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