Service manual

15
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MAINTENANCE
1 - CLEANING THE HEATING SYSTEM SHELL
• Remove the screws (B) from the cast-iron heating system
shell cover (C)
• Remove the flue outlet baffle (D)
Note: If vacuuming be careful not to damage insulator, check
for deterrieration and replace if needed
• Remove the combustion baffles (E) clean, inspect and
replace if deteriorated
• Clean the inner walls of the heating system shell, remove
any debrie that may have fallen to the bottom of the chamber
• Reassemble all the parts the way they were removed,
positioning the flue outlet (D) with its centering screw (P)
towards the front of the heating system, then positioning the
heating system shell cover (C) arrow marker opposite the
centering screw (P)
• Replace the screws (B) in the heating system shell cover.
Fig. 44
2 - CLEANING THE CONDENSER
• Remove the wing nut (F) from the condenser top cover
(G) and remove the cover
• Remove the condenser access plug (7)
• Clean the condenser tubes (H) using a bottle brush or
similar tool
• Pour tap water through the condenser tubs to ensure
combustion products can flow freely
• Visually inspect vent house tee at condenser outlet for
integrity
• Replace the condenser access plug (7) and the top cover
(G), making sure that the seal (I) is properly positioned
when replacing the cover
• Make sure that the seal (I) on the cover and the access
plug is in good condition.
• Inspect and clean the condensate trap(external)
NOTE: If after cleaning the condenser, the temperature of
the flue gasses still exceeds 250°F, perform a burner check.
Fig. 41
3 - BURNER MAINTENANCE
Once adjusted properly, regular maintenance of the oil burner
is not generally required. A routine examination of the burner
should include examination of the burner fan and housing for
dirt and the spark electrodes for proper clearances. The nozzle
should be replaced after every 1000 gallons of fuel used, due
to wear. Replace the fuel filter if necessary. Cleaning and
adjustment is always appropriate during periodic inspection. If
burner firing rate adjustment is required, follow instructions in
“Adjusting the Oil Burner”.
ALWAYS CHECK FOR AND CORRECT ANY FUEL LEAKS
4 - ADDITIONAL COMPONENT MAINTENANCE
Check to see that the safety and regulation devices (safety
relief valve, air bleed valve, control box components, etc.) are
operating properly. Check that the condensate drain trap is
clean. If necessary, remove the bottom of the trap, clean it,
replace it and then refill the trap it with water. Also check to
see that neither the installation nor the heating system have
any water or fuel leaks (leaks may produce a risk for safety
and shorten the life-span). If it becomes frequently necessary
to add water to maintain pressure in the installation, even
though no leaks have been discovered, perform an expansion
tank check or if the pressure releif valve drips or pops
occasionally.
5 - EXPANSION TANK PRE-INFLATION PRESSURE CHECK
Reduce the pressure in the heating installation by opening the
drain cock or the safety valve until the pressure gauge reading
is less than 7 - 8 psig (0.5 bar)
Check the pressure in the expansion tank and if necessary
bring it back up to pressure. Replace the tank if the membrane
is punctured (water present in the inflating valve)
To optimize the efficiency of the expansion tank:
• Adjust its pre-inflation pressure in line with the installation.
The pressure must correspond to the static height of the
installation (H), the height between the highest point of the
installation and the expansion tank, as expressed in psi
where 2.41Ft in height = 1 psi
• Adjust the filling pressure of the installation to a value greater
than 3 psi (0.2 bar) above the pre-inflation pressure of the
tank after totally bleeding any air from the installation.
Water inlet
Dilated
water
volume
Pressure
rises as
the air is
compressed
Max
vessel
volume
Membrane
Inflating
valve
H