Operating instructions

4.3.2 Maintenance schedule for safety devices
No. Component / Maintenance Operation Int.
1 System pressure
❒
Check the system pressure on the pressure gauge
➥ The value must be 20% over the pre-stressed pressure of the ex‐
pansion tank
NOTICE! See the expansion tank operating instructions
If the system pressure is less:
❒ Top up the water
☞ If this occurs frequently it indicates that the heating system is not
sealed correctly.
Call the installer.
❒ If large pressure fluctuations are observed:
➥ Have the expansion tank checked.
D
2 Burn back flap
❒
Check the seal and efficiency of the burn back flap
W
3 Safety valve (provided by the customer)
❒
Check the safety valve as per the manufacturer's instructions
NOTICE! See the safety valve operating instructions
M
4 Safety battery valve
❒
Pull the safety valve sensor out of its immersion sleeve
❒ Hold the sensor in a heated water tank fitted with a temperature dis‐
play
❒ Heat the water until the temperature reaches the setpoint value for the
valve
➥ At this temperature the valve must open and allow cold water to
flow into the safety battery
❒ After the test, push the valve sensor back into its immersion sleeve
❒ Check for water flowing out of the safety battery drain pipe
➥ Clean or change the valve if it leaks
☞ Risk of scaling in the safety heat exchanger
❒ If the heat exchanger is badly scaled, the flow rate will be very low. In
this case the heat exchanger must be descaled by a specialist compa‐
ny.
Q
5 Safety temperature limiter (STL)
❒
Pull the STL capillary sensor out of its immersion sleeve
❒ Hold the sensor in a heated water tank fitted with a temperature dis‐
play
❒ Heat the water until the temperature reaches the setpoint value (ap‐
prox. 100°C) for the STL
➥ The system will shut down and a fault message will be displayed
☞ If the system does not shut down, change the STL immediately
❒ Reset the STL by hand:
❒ Allow the sensor to cool down and then unscrew the cap from the STL
❒ Reset the safety temperature limiter by pressing with a screwdriver
Y
6 Heating EMERGENCY STOP switch
❒
Check that the heating emergency stop switch is working properly
4
Servicing
Maintenance schedule
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