TMG -HW41T Product Manual page 17

Final adjustments to burner include fuel pressure adjustment for controlling water temperature (tighten
fuel pressure adjustment screw slightly to increase desired output temperature) and air band adjustment
for combustion efficiency. A combustion test kit should be used for these final adjustments. Check
SPECIFICATIONS chart for the burner oil pressure corresponding to your model and be sure not to
exceed this pressure.
If the burner floods with oil: run machine with heat on until all excess oil is burned off (this can take up to
a couple of hours). If excess oil is not properly dealt with, the ceramic casing can absorb excess oil,
causing a fire hazard. DO NOT LEAVE MACHINE UNATTENDED WHILE MACHINE IS FLOODED.
General Maintenance and Care
If the water heater is likely to be exposed to freezing weather then it should be winterized according to
the winter pump/coil protection procedure in the previous section. Alternate methods may not completely
protect the components. Damage from freezing is not a warrantable item.
Water Condition
Use a softener on your water system if local water is known to be high in mineral content. The
advantages of soft water are very beneficial: prevents scale buildup in heater coil, cleans better with
considerably less detergent, prevents streaking on painted surfaces and glass when rinsing.
Descaling Heater Coil Procedure
NOTE: Descaling of the heater coil is to be done by authorized and trained professionals only.
The best way to acidize the coil is with a circulation pump capable of handling acids.
1.Fill a plastic container with a suitable acid diluted with water to desired strength.
2.Connect discharge from the circulating pump to the hot water outlet on the water heater with a suitable
hose. Connect the inlet of the circulating pump to the acid container with suction hose from the pump
module and use it as a return hose to the acid container. As acid dissolves the scale it becomes
neutralized, so about every five minutes add more acid to the container until all the scale has been
removed from the coil. Flush out coil thoroughly with water after descaling.
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