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2.7.3 Alarm messages
In the event of a break in the sensor, "Sbr" will appear in the display; in the event of a short circuit in the sensor, "Err"
will appear in the display.
In both cases, cooling will be switched on automatically to protect the consumer from overheating (Indicator light
"OUT 2").
Element
Meaning
Pump,
Control
Light illuminated
––
Table 1: RT32 (Gefran 1200) control and display elements)
2.7.4 Switching on using the RT50 control system (Fig. 4)
Once the unit's main switch has been actuated, the display will indicate OFF. The RT50 is now ready for operation.
The water will be filled automatically.
Turn the unit on by pressing the "ON/OFF" key. Depending on its programming, the display will show the set-point
and actual values, as well as information on the operating state of the control system and/or unit. See also Section 6 of
the RT50 Programming Instructions.
Check the temperature control circuit (unit, consumer, etc.) for leaks.
Close the consumer vent valve once water flows out of it regularly.
2.7.5 Operating and display elements (Fig. 4)
1
LCD display
2
Programming and display selection
3
Alarm reset key
4
On/Off key
5
Leak-stop key (inactive)
6
Suction/blow-out key
7
Set-point toggle switch SP1–SP2
8
Timer key
9
Set-point value input and programming keys
10
Status line
Set-point and actual value display
Once the control system has been switched on using the "ON/OFF" switch, the set-point temperature (SP1 or SP2)
will appear in the lower section of the display, and the outlet temperature (actual value) of the internal sensor in the
heat transfer fluid in the consumer (S1) or of the external sensor in the consumer (S2) will appear in the upper section
of the display.
Set-point value input and programming keys
Keys for increasing/decreasing the set-point value, selecting the programming position, and changing the programmed
values.
Timer key
If the RT50 is equipped with a timer, it is activated using this key. The timer switches the unit on and off.
LEAK-STOP key (inactive).
SUCTION key
Pressing this key initiates the suction program, in which the consumer connected to the unit is evacuated via the
pump by means of suction.
Suction is possible only when the temperature of the heat transfer fluid is below the programmed run-out temperature
value (RT50 Programming Instructions, Section 7.2, P 4.3). If this is not the case, the unit will first cool the fluid to this
value.
The pump is then switched off. Once the pump run-out time has elapsed (RT50 Programming Instructions, Section
7.2, P 4.9), the pump is switched on again in the opposite direction of rotation and used to evacuate the consumer for
the programmed evacuation time (RT50 Programming Instructions, Section 7.2, P 4.6).
Once the programmed evacuation time has elapsed, the unit will switch off automatically.
In suction mode, the heat transfer fluid in the consumer will enter the sewage system through the cooling water out-
let.
The suction program can be interrupted by pressing the ON/OFF key. Pressing the key again (wait until OFF shows in
the display) returns the unit to normal operation.
BA 90M-P140M-P160M(D) 0802/dfe
All manuals and user guides at all-guides.com
OUT 1
OUT 2
Heating
Cooling
Operating
Operating
Level control
Motor protector
Insufficient fluid
Thermal relay
in circuit
triggered
Fig. 4: Operating and display elements
Safety thermo-
stat
Excess
temperature
23
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