4.2.3 after the function has been activated). Activate the
function by connecting potential-free switch functions
to two inputs selected in menu 7.4 - "Selectable in/out-
puts" (SG Ready A and SG Ready B).
Closed or open switch means one of the following:
– Blocking (A: Closed, B: Open)
“SG Ready” is active. The compressor in the air/water
heat pump and additional heat are blocked in the same
way as current tariff blocking.
– Normal mode (A: Open, B: Open)
"SG Ready" is not active. No effect on the system.
– Low price mode (A: Open, B: Closed)
"SG Ready" is active. The system focuses on costs sav-
ings and can for example exploit a low tariff from the
electricity supplier or over-capacity from any own power
source (effect on the system can be adjusted in the
menu 4.2.3).
– Overcapacity mode (A: Closed, B: Closed)
"SG Ready" is active. The system is permitted to run at
full capacity at over capacity (very low price) with the
electricity supplier (effect on the system is settable in
menu 4.2.3).
(A = SG Ready A and B = SG Ready B )
External blocking of functions
An external switch function can be connected to VVM S320
for blocking various functions. The switch must be potential-
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 circulation
(HWC) remains in operation.
• compressor in heat pump EB101
• internally controlled additional heat
• tariff blocking (additional heat, compressor, heating,
cooling and hot water are disconnected)
Possible selections for AUX output
Caution
The relay output 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.
Indications
• alarm
• common alarm
• cooling mode indication
• holiday
• away mode
Control
• circulation pump for hot water circulation
• external heating medium pump
Connecting external circulation pump
NOTE
The relevant distribution box must be marked with
a warning about external voltage.
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
NIBE VVM S320Chapter 5 | Electrical connections26
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