21
To clean heater through cleanout opening, proceed as follows:
1. Turn off water inlet valve, the heater electrical disconnect
switch and open drain valve.
2. Remove outer cover plate from lower side of heater jacket.
3. Remove cover from cleanout opening.
4. Remove lime, scale or sediment using care not to damage the
glass-lining.
5. Inspect cleanout plate gasket: If new gasket is required, replace
with part no. 99038.
6. Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7. Close drain valve, open water inlet line and turn on the power
burner electrical disconnect switch.
8. Check for water leakage.
9. Replace outer jacket cover plate.
RELIEF VALVE
At least twice a year, the temperature and pressure relief valve
should be checked to ensure that it is in operating condition. To
check the relief valve, lift the lever at the end of the valve several
times. The valve should seat properly and operate freely.
CAUTION
BEFORE MANUALLY OPERATING THE VALVE, MAKE SURE
THAT A DRAIN LINE HAS BEEN ATTACHED TO THE VALVE
TO DIRECT THE DISCHARGE TO AN OPEN DRAIN. FAILURE
TO TAKE THIS PRECAUTION COULD MEAN CONTACT WITH
EXTREMELY HOT WATER PASSING OUT OF THE VALVE
DURING THIS CHECKING OPERATION.
If the temperature and pressure relief valve on the heater
discharges periodically or continuously, it may be due to thermal
expansion of water in a closed water supply system, or, it may be
due to a faulty relief valve.
Thermal expansion is the normal response of water when it is
heated. In a closed system, thermal expansion will cause the
system pressure to build until the relief valve actuation pressure
is equaled. Then, the relief valve will open, allowing some water
to escape, slightly lowering the pressure.
Contact your water supplier or local plumbing inspector on how
to control this situation.
Two common corrections are listed in the Checklist and Service
Information which appears later in this manual.
ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND
PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION AND
CAN CREATE A HAZARDOUS SITUATION.
CIRCULATING PUMP
The water heating system may include a circulating pump. Where
used, it should be lubricated as directed by the circulator
manufacturer.
POWER BURNER
Keep the area around the burner clear and free of combustible
materials, gasoline or other flammable liquids or vapors. Do
not obstruct burner air openings or ventilation grilles for
combustion air.
TYPICAL MAIN BURNER FLAME
FIGURE 10
The main burner flames (fig. 10) should be visually checked once
a year for proper operation. This can be observed through the
“peep sight” port on the burner housing. Burner flame should be
blue. DO NOT use the observation port on the side of the tank to
inspect the burner flame.
1. Add a few drops of no. 20 non-detergent oil (***81-140 thru
***81-370) into the oil tubes once every three months.
2. At least annually, contact a qualified service agency for a burner
readjustment, cleaning and other than routine maintenance.
Should the main burner or burner air openings require cleaning,
remove the burner and clean with a soft brush. Clean main burner
orifice with a suitable soft material.
VENT SYSTEM
Examine the vent system every six months for obstructions and/
or deterioration of vent piping. Remove any soot or obstructions
and replace damaged vent piping.
BAROMETRIC DRAFT CONTROL
The heater is equipped with a double acting barometric draft
control. This control assembly is factory adjusted to automatically
regulate the chimney draft imposed on the unit. The damper
gate must pivot freely in the ring guides, see figure 11.
BAROMETRIC DRAFT CONTROL
FIGURE 11
