Lennox COWB2

25
ANNUALLY: To assure trouble free operation, it
is recommended that the ue passages, combus-
tion chamber area (target wall, re door insula-
tion, durablanket), burner adjustment, operation
of the controls, and boiler seals (re door gasket
or silicone seal, cast iron sectional seals, ue
collector) be checked once each year by a com-
petent Service Technician. Before the start of
each heating season (or whenever the system
has been shut down for extended periods of time)
recheck the whole system for water, oil, and vent
piping leaks. Replace or patch any leaks or seals
that are faulty.
VENT PIPE: Visually inspect the entire venting
system once a month for any signs of leakage,
deterioration, or soot build up. If the vent pipe
shows any signs of leaking or deterioration,
replace it immediately. If it shows any signs of
soot build up, clean the vent pipe and have the
burner settings and combustion checked by a
competent professional.
RELIEF VALVE: This valve should open
automatically when the system pressure exceeds
the pressure rating (usually 30 psi) of the relief
valve. Should the valve ever fail to open under
this condition, shut down the system. Drain the
system until system pressure is reduced below
the relief valve pressure rating. Then contact
a competent Service Technician to replace
the valve and inspect the heating system and
determine the cause, as this problem may indicate
an equipment malfunction. The relief valve should
be tested monthly during the heating season.
Prior to testing, make certain a discharge pipe
is properly connected to the valve outlet and
arranged so as to contain and safely dispose of
boiler discharge. Hold the trip lever fully open for
at least ve seconds in order to ush free any
sediment that may lodge on the valve seat. Then
permit the valve to snap shut. Refer to the valve
manufacturer’s instructions packaged with the
valve for more details.
MaiNTeNaNCe
CONVENTIONAL EXPANSION TANK: As
noted in the EQUIPMENT AND OPTIONAL
ACCESSORIES section, this tank may become
water logged or may receive an excess of air.
Frequent automatic opening of the relief valve
indicates water logging. A high boiler temperature
accompanied by unusually low radiation unit
temperature (and “knocking” noises) indicates
excess air in the tank. To correct either condition,
close the valve between the boiler and the tank.
Drain the tank until empty. Check all the tank
plugs and ttings, tighten as necessary. Open
the valve between the boiler and tank. Water will
rise to the normal height in the tank if the system
has an automatic ll valve, otherwise manually
rell the system.
DIAPHRAGM EXPANSION TANK: As noted in the
EQUIPMENT AND OPTIONAL ACCESSORIES
section, this tank may become water logged.
Frequent automatic opening of the relief valve
indicates water logging. A high boiler temperature
accompanied by unusually low radiation unit
temperature (and “knocking” noises) indicates
excess air in the tank. To correct this condition,
replace the diaphragm expansion tank.
WATER SYSTEM: If the system is to remain out
of service during freezing weather, always drain
it completely (water left in to freeze will crack the
pipes and/or boiler).
TANKLESS COIL (OR COVER PLATE) GASKET:
This gasket should be checked at least twice a
year for leakage and replaced if necessary. If
the gasket is replaced, make sure that when the
coil plate (or cover plate) is reattached that the
ten nuts are torqued in an alternating pattern to
ensure equal force is applied to the entire gasket
creating a good seal. The nuts should be torqued
such that the gasket does not squeeze out from
behind the plate.
OIL BURNER: Oil burner maintenance is listed in
this manual under OPERATING THE BOILER.
Never burn garbage or paper in the unit, and never leave combustible material around it.