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Modu-Fire
®
Gas-Fired Boiler Maintenance
24
5.0 MAINTENANCE
General Lock out / Tag out procedure must be em-
ployed when servicing unit.
Hazard analysis should be performed by end user to
insure safety of their employees and/or service tech-
nicians.
In addition to the requirements of Section 2.1, main-
tenance performed on the Siemens gas valve re-
quires that the valve be removed from the boiler and
securely placed in a vice prior to performing any
maintenance.
5.1
MAINTENANCE AND INSPECTION SCHEDULE
WARNING!
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
Verify proper operation after servicing.
5.1.1 Daily
Observe operating temperature and general condi-
tions. Make sure that the flow of combustion and
ventilating air to the boiler is not obstructed. De-
termine the cause of any illuminated red indicators,
unusual noises or operating conditions and make the
necessary corrections.
WARNING!
Check daily to be sure that the boiler area is free
and clear of any combustible materials, including
flammable vapors and liquids.
The motorized gas valves contain hydraulic oil
which may be hazardous to the environment.
Should a leak develop, use safe procedures for dis-
posal of this or any other lubricant.
5.1.2 Weekly
Observe the conditions of the pilot and main flame.
A normal High fire flame is blue. If the flame is
yellow, then corrective action must be taken. In
Low fire the burner will glow a yellowish orange.
Correct air adjustment is essential to the efficient
operation of this boiler. If an adjustment in the
combustion is necessary, the flue gas composition
should be checked with a carbon dioxide (CO
2
) or
oxygen (O
2
) analyzer to set conditions. Refer to
Section 3.12.2 and 3.12.3.
5.1.3 Monthly (During Operation)
1. Test flame detection by voltage reading at the
control programmer.
2. Test high-limit control by reducing setting be-
low the operating temperature. Burner should
shut off. After readjusting the thermostat, press
the button to reset the switch.
3. Test operating temperature controls by reducing
or increasing temperature setting as necessary to
check burner operation.
4. Check flue gas temperature at outlet. If there is
a temperature increase over previous readings,
this probably indicates sooting or water scale
build-up.
5. Test the water cutoff by trying to restart boiler
with the system pump off. The boiler should
not operate. Water flow indicator should light.
6. Test low gas pressure switch by closing main
gas cock and attempting to restart boiler.
This work should be performed by factory-trained
personnel.
5.1.4 Semi-Annually
In addition to the recommended monthly service:
1. Inspect and clean blower fan and inlet screen of
any accumulated dust or lint.
2. Clean burner of any accumulated dust or lint.
See Section 5.2 on "Cleaning the Burner."