Rotex E-Solar Unit ESU 509, Инструкция по установке и обслуживанию

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7 Electric heat generator
52
FA ROTEX ESU - 07/2008
Releasing the safety temperature limiter (STL)
7.4 Fault shutdown of the power circuit board
A fault shutdown occurs if the temperature exceeds 105 °C in the flow.
This situation can arise if

the heating circuit pump fails

if the overflow pipe is clogged

there is a defect (controller, power circuit board etc.)

the control parameters are set incorrectly (e.g. incorrect device type)
The STL disconnects the power circuit board from the power supply and thus, the tubular radiators as well. The controls and the
pump continue to operate. The controller does not necessarily display the fault shutdown.
The controller display will not necessarily indicate that a safety fault shutdown has occurred for one or two
tubular radiators. The malfunction is only indicated if the temperature still has not increased a long time after
a heat request was made.
A relatively easy way to check whether a tubular radiator is working or not, without having to open the unit,
is to look at the electricity meter. A tubular radiator consumes 0.05 kWh of power every minute.
1. Allow the heat generator to cool down sufficiently.
2. Error detection and elimination.
3. Open the electric heat generator housing.
4. On the STL, use a screwdriver, for example, to press
the metal flag that is protruding between the push-on
connections down hard.
Fig. 7-2 STL with protruding metal flag
Fault correction
1. Allow the heat generator to cool down sufficiently.
2. Error detection and elimination.
3. Unlock STL on the control panel. By pressing the red
button until a clicking sound can be heard.
Fig. 7-3 STL left control panel side