NOTE
Blocking entails a risk of freezing.
Functions that can be blocked:
• hot water (hot water production). Any hot water circulation
(HWC) remains in operation.
• heating (blocking of heating demand)
• internally controlled additional heat
• compressor
• tariff blocking (additional heat, compressor, heating and
hot water are disconnected)
Possible selections for AUX output
Indication
• alarm
• holiday
• away mode
Control
• circulation pump for hot water circulation
• external heating medium pump
• external damper for frost protection.
NOTE
The relevant distribution box must be marked with
a warning about external voltage.
Connecting external circulation pump
An external circulation pump is connected to the AUX out-
put, as illustrated below.
1
2
3
NO
C
NC
AA2-X27
L N PE
L
N
PE
27Chapter 5 | Electrical connectionsNIBE S735
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