Maintenance And Routine Servicing; Component Replacement And Cleaning - UTICA BOILERS MAHF-100 Manual

!
WARNING
Following service procedures must be performed
by qualified service agent. Boiler owner shall not
attempt these steps. Failure to do so could result
in death or serious injury.
!
WARNING
Combustion chamber insulation in this product
contains ceramic fiber material. Ceramic fibers
can be converted to cristobalite in very high
temperature applications. The International
Agency for Research on Cancer (IARC) has
concluded, Crystalline silica inhaled in the form
of quartz or cristobalite from occupational
sources is carcinogenic to humans (Group1).
Avoid breathing dust and contact with skin and
eyes. Use NIOSH certified dust respirator (N95).
This type of respirator is based on the OSHA
requirements for cristobalite at the time this
document was written. Other types of respirators
may be needed depending on the job site
conditions. Current NIOSH recommendations
can be found on the NIOSH website http://
www.cdc.gov/niosh/homepage.html. NIOSH
approved respirators, manufacturers, and phone
numbers are also listed on this website. Wear
long-sleeved, loose fitting clothing, gloves,
and eye protection. Apply enough water to the
combustion chamber lining to prevent dust. Wash
potentially contaminated clothes separately from
other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid. Eye: Irrigate
immediately. Breathing: Fresh air.
!
WARNING
Before servicing, turn off electrical power to
boiler at service switch. Close manual gas valve
to turn gas supply OFF to boiler. Test for gas
leaks on any gas carrying components after
servicing. Service not complete until appliance
operation verified per Installation, Operation &
Maintenance Manual provided with boiler.
! !
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Failure to
follow these instructions could result in minor or
moderate injury.
NOTICE
Perform regular service and maintenance by
qualified service agency at least once every 12
months to assure safe, trouble free operation and
maximum efficiency.
11 - GENERAL MAINTENANCE AND CLEANING

11.2 Maintenance And Routine Servicing

Check and service boiler as necessary.
Frequency of servicing will depend upon installation
conditions and usage, manufacturer recommends
annually.
• Check flue terminal outside and ensure it is not
blocked.
• Operate boiler. Check operation of boiler's controls.
• Ensure all system connections and fittings are
sound. Correct any joints and fittings that maybe
leaking.
• Follow safety valve manufacturer recommendations
for service.
To ensure boiler operates at peak efficiency, following
checks must be performed every year:
• check appearance and tightness of gas and
combustion circuit gaskets
• check condition and position of ignition and flame
sensing electrodes
• check condition of burner and its connection to
aluminum front plate
• check for dirt in combustion chamber. Use
vacuum cleaner for this cleaning operation
• check gas valve is calibrated correctly using
combustion analyzer
• check there is no dirt in condensate trap
• check central heating system pressure
• check expansion tank pressure
• check vent system, clean if necessary
Record details and maintain service history.

11.3 Component Replacement And Cleaning

1.
Remove any deposits from heat exchanger using
suitable soft brush. Do not use brush with metallic
bristles.
2.
Check condition of the combustion chamber
insulation panels. Any damaged panels must be
replaced.
3.
Check condition of burner. Clean burner with soft
brush and check flame ports are clear. Blockages
may be removed with stiffer brush. Do not use a
brush with metallic bristles this might damage the
burner.
4.
Remove any fallen deposits from bottom of inner
case.
5.
Check condition of electrodes.
6.
Check spark gap, positioning and height of
electrodes.
7.
Check fan impeller is clean and free to rotate.
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240013371 REV B, [10/01/2021]