Recirculating coolers
35
Stand-by input (L)
1
2
3
+
AK
Ø
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 40).
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 33).
Return flow safety device
Control connector for solenoid valves (14.)
(line voltage: 230 V).
