Manual

Electrical connections
36
Stand-by input (L)
1
2
3

AK

Pin assignment: Pin Signal
1 not used
2 5 V / DC
3 0 V
Activate the stand-by input:
Under menu item E
_
Sb, set the parameter to 1
(see page 41).
Connect an external contact 'AK' (e.g. for emergency switch-off)
or an alarm contact of the superordinated application system.
In case the connection between Pin 2 and Pin 3 is interrupted by
opening the contact 'AK', a complete shutdown of the circulating
pump, heater and cooling compressor is effected, and the unit
enters the condition "stand-by". The message "E
_
Sb" appears on
the MULTI-Display (LED2) (see page 34).
Return flow safety device
Control connector for solenoid valves (14.)
(line voltage: 230 V).