BA 90M-P140M-P160M(D) 0802/dfe
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2.8 Switching off
2.8.1 Switching off with the RT32 control system (Gefran 1200). Model 90M only
1
Cool unit/temperature control circuit to max. 80 °C.
2
Switch off the pump (
→
Table 1).
2.8.2 Switching off with the RT50 control system
The switching-off process is initiated by pressing the “ON/OFF” key or via the timer. Depending on the temperature of
the heat transfer fluid, the process is as follows:
– Pump and control are switched off. The RT50 is still under power (stand-by mode). The display indicates
OFF
.
– The pump continues to run. The unit cools until the temperature of the heat transfer fluid has reached the pro-
grammed run-out temperature (factory setting 80 °C; see RT50 Programming Instructions, Section 7.2, P 4.3). The
pump and control system are now switched off. The RT50 enters stand-by mode. The display indicates
OFF
.
2.8.3 By previous evacuation of the consumer
See Optional features, Section 7.
2.9 Changing the consumer. Shutting the unit down for longer than one month. Restarting the unit.
Before removing connection hoses, ensure that the unit is switched off and that all circuits are free of pressure (
→
2.8).
The unit must be evacuated completely and stored in a dry location between 10 and 40 °C when not in use. Restarting
the unit (
→
2.1–2.7).
3 Malfunctions
3.1 Malfunction displays on the RT50 control system
The alarm display blinks every second, and an acoustic signal will sound. Malfunctions must always be corrected by
qualified personnel.
The following boxed texts may appear on the display:
For control Outlet sensor, Inlet or External.
If a sensor becomes defective, the unit will switch to cooling automatically.
During Cascade control , a defective external sensor (S2, consumer) will cause the unit to control to the internal sen-
sor S1. The actual value of the internal sensor temperature at the time of sensor malfunction will be used as the new
set-point value. The alarm must be acknowledged.
Level too low
Wrong phase sequence
The pump switches off a few seconds after it is switched on. Pump and control system remain off.
Motor current exceeded
Mal. Motor contactor One or more phases is missing or no response was received from the motor contactor via the
auxiliary contact.
Safety therm. triggered The unit cools automatically.
Heater thermostat triggered (inactive).
Max. set-point exceeded The unit cools automatically.
Flow monitor triggered Heater switches off automatically.
Min. flow rate not met The heater switches off automatically.
Deviation/outlet, Set point/ext. actual value, Set point/inlet exceeded or not met.
Unit and control continue to run normally.
Heating contactor malfunction Cause: Did not respond to close/open command.
Excessive leak-stop set-point/actual value