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240012994 Rev. B [08/31/2020]
11 - GENERAL MAINTENANCE AND CLEANING
11.11 Safety Flue Thermostat -
DO NOT disable this safety
device.
Safety Flue Thermostat found on the ue inside the boiler,
interrupts ow of gas to the burner if the temperature
overheats.
After verifying the cause of the trip, press
for about 2
seconds.
11.12 Flue Pressure Switch (150 Only)
DO NOT disable this safety device.
This device, positioned inside the sealed chamber, interrupts ow of
gas to the burner if ue pressure exceeds 1.6 in w.c. (4 mbar).
Verify if vent is blocked before resetting the boiler.
NOTICE
When servicing the appliance, check the condition and
position of ame sensing electrode and replace it if
necessary.
11.13 Replacement Parts
Perform Automatic Calibration procedure described in section
9.8 if one or more of the following components are replaced.
Check and adjust CO2% value as indicated in the Combustion
Table.
Components replaced:
• Primary heat exchanger
• Fan
• Gas valve
• Gas orice
• Burner
• Flame sensing electrode
• Spark electrode
11.10 User Information
Advise and demonstrated to User the following important
information:
A. How to light and turn o boiler. How to operate
system controls.
B. Importance of annual servicing of boiler to ensure safe
and ecient operation.
C. Servicing or replacement of parts shall be carried out
by a qualied personnel.
D. Ensure boiler controls and room thermostat, if tted,
are set to User's requirements.
E. Tell User about sealed system pressure.
F. Tell User if display is active and boiler has not
operated for 24 hours for heating or hot water, the
pump and three way valve will automatically operate
for 1 minute.
G. Explain to User an internal frost thermostat is tted in
boiler, and electrical supply to boiler must be left on
for thermostat to operate.
H. Show User position of pressure relief valve discharge
pipe.
I. Leave this Installation, Operation and Maintenance
Manual with User for use on future calls.
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