Operating instructions

 Prevent kinking or squeezing of the tubes.
 We recommend using a leak detector with water shut-off to
prevent damage due to cooling water system leaks.
 Ensure that the cooling water meets the required criteria.
 In the case of leaks in the condenser, there is the danger that
refrigerator oil and refrigerant from the refrigerant circuit of the
device can get into the cooling water. Comply with all appli-
cable legal provisions and the requirements of the water supply
companies at the operating site.
4.5 Interfaces
4.5.1 Alarm output 12N
Function Description
Alarm output --
Alarm and standby for on-site return flow protection
 Max. 30 V DC; 1 A
Fig. 7: Flange connector (front) in idle state
1 Normally open contact
2 Centre
3 Normally closed contact
Front view of the flange connector or of the coupling socket on the
solder side
Idle state
 The device is in idle state when it is switched off and in the
case of failure.
 Pins 1 and 2 are open.
 Pins 3 and 2 are closed.
GO state
 The device is in GO state immediately after switching on and
during normal operation without faults.
 Pins 1 and 2 are closed.
 Pins 3 and 2 are open.
Available functions
Before commissioning
Variocool 29