External blocking of functions
An external switch function can be connected to S1155
for blocking various functions. The switch must be po-
tential-free and a closed switch results in blocking.
NOTE
Blocking entails a risk of freezing.
Functions that can be blocked:
• heating (blocking of heating demand)
• hot water (hot water production). Any hot water circu-
lation (HWC) remains in operation.
• compressor
• internally controlled additional heat
• tariff blocking (additional heat, compressor, heating,
cooling and hot water are disconnected)
Possible selection for AUX output (potential
free variable relay)
It is possible to have an external connection by means
of a relay function via a potential-free switching relay
(max 2 A) on the PCB (AA2), terminal block
X27:NO,C,NC. The function must be activated in menu
7.4.
The picture shows the relay in the alarm position.
If S1155 is switched off or in emergency mode, the relay
is in alarm position.
Caution
The relay outputs may be subjected to a max
load of 2 A at resistive load (230V AC).
TIP
The AXC accessory is required if more than
one function is to be connected to the AUX
output.
Optional functions for external connection:
Indications
• alarm indication
• indication of common alarm
• cooling mode indication (only applies if there are
cooling accessories)
• holiday indication
• away mode
Control
• control of circulation pump for hot water circulation
• control of external circulation pump (for heating medi-
um)
• control of external reversing valve for hot water
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
output, as illustrated below.
1
2
3
NO
C
NC
AA2-X27
L N PE
L
N
PE
Settings
ELECTRICAL ADDITION - MAXIMUM OUTPUT
Number of steps, maximum electrical output and supply
on connection for the immersion heater varies depend-
ing on model. See tables.
The electric additional heat may be restricted depending
on the selected country.
The immersion heater's power is split into steps (four
steps, if the immersion heater for 3x400 V is switched
to maximum 9 kW), according to table.
Setting maximum output in the electric additional heat
is done in menu 7.1.5.1.
Power steps of the immersion heater
The tables display the total phase current for the immer-
sion heater at start up. If an immersion heater has
already been started, and is not being used to its full
capacity, the values in the table can be changed because
the control initially uses this immersion heater.
Switching to maximum electrical output
If more than the maximum power (7 kW) for the immer-
sion heater connected on delivery is needed, the heat
pump can be switched to maximum 9 kW.
Move white cable from terminal block X7-2:N to terminal
block X9:L(2) on the PCB (AA2).
NIBE S1155Chapter 5 | Electrical connections26
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