User Information; Safety Flue Thermostat; Flue Pressure Switch (125-150 Only); Replacement Parts - UTICA BOILERS MAH-100 Manual

11.10 User Information

Advise and demonstrated to User the following important
information:
A. How to light and turn off boiler. How to operate
system controls.
B. Importance of annual servicing of boiler to ensure safe
and efficient operation.
C. Servicing or replacement of parts shall be carried out
by a qualified personnel.
D. Ensure boiler controls and room thermostat, if fitted,
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 will automatically operate for 1 minute.
G. Explain to User an internal frost thermostat is fitted 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.
11.11 Safety Flue Thermostat - DO NOT disable this
safety device.
Safety Flue Thermostat found on the flue inside the boiler,
interrupts flow of gas to the burner if the temperature
overheats.
After verifying the cause of the trip, press
seconds.

11.12 Flue Pressure Switch (125-150 Only)

DO NOT disable this safety device.
This device, positioned inside the sealed chamber,
interrupts flow of gas to the burner if flue pressure
exceeds 1.6 in w.c. (4 mbar).
Verify if vent is blocked before resetting the boiler.
11 - GENERAL MAINTENANCE AND CLEANING
for about 2
When servicing the appliance, check the condition and
position of flame 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 orifice
• Burner
• Flame sensing electrode
• Control Parameter Key
63
NOTICE
240013354 REV B [09/15/2021]