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Water Temperature Regulation
Once installed, the operation will be completely automatic.
The thermostat (aquastat) on the water heater is adjustable
and will maintain water at the desired temperature.
WARNING: HOT WATER CAN PRODUCE 3RD DEGREE
BURNS IN 6 SECONDS AT 140
o
F (60
O
C) IN 30 SECONDS
AT 130
O
F (54
O
C)
Thermostats are factory set at 49°C (120°F). Contact a qual-
ified Oil-Burner Technician for adjustment. Set the tank ther-
mostat as low as possible to provide an adequate supply of
hot water. This will conserve oil and extend the life of the
tank.
General
Do not attempt to repair your water heater. Call a qualified
Oil-Burner Technician for service. Turn “OFF” the electric
power whenever the water supply is shut off. Before calling
for service, check that:
1. The heater is properly filled.
2. The electrical supply has not been interrupted.
Professional Maintenance
Except for external appearance and area tidiness, the fol-
lowing steps should be performed only by a qualified Oil-
Burner Technician.
1. Lift out the flue baffle to clean the flue. (On rear and com-
bination flue heaters, the top cover, insulation and flue
top cover must be removed.)
2. Insert a flue brush down the flue passage way(s) to
remove soot and dirt. Soot or carbon that falls into the
combustion chamber will burn up within a very short
time.
3. In normal use, there should be no large accumulation of
soot in the combustion chamber. If there is, remove the
burner and carefully brush or vacuum the combustion
chamber.
Flue Pipes
Once a year, inspect the flue pipe leading from the heater to
the chimney. If corrosion is evident, or discolouration at the
joints can be seen, replace the flue pipes. This should be
done by a qualified Oil-Burner Technician. Flue pipes must
be replaced by the same size flue pipe as the flue collar
(breech connection) at the heater.
Combustion Tests
Burner adjustments:
Final burner adjustments must be made using combustion
test equipment to assure proper operation. Do not fire
heater without water or sections will overheat.
1. Refer to burner manual for start-up.
2. Allow heater to heat to design condition.
3. Using combustion test equipment, adjust burner for:
a. CO
2
between 11% and 12% and a trace of smoke
between No. 0 smoke and No. 1 smoke.
b. over-fire draft -0.01 to -0.02 in. (-0.254 to -0.508mm)
water column draft in combustion chamber (+0.25 in.
(+6.35mm) for JWF307V).
NOTE: For JWF307V also see additional “Installation
Instructions for Through-the-wall Venting Components",
63391, that is supplied with the JWF307V.
General Maintenance (by owner)
As a precaution against fire, and to maintain an adequate
flow of combustion air to the heater:
• Keep the appliance area clear and free from com-
bustible material, gasoline and other flammable vapors
and liquids.
• Keep the air ventilation openings unobstructed. If dust
and lint is seen accumulating around the openings,
remove it.
• Do not pile cartons, papers, or combustible materials on
top, or near the heater (see Figure 1).
WARNING
Water temperature over 52°C (125°F) can cause
severe burns instantly or death from scalds.
Children, disabled and elderly are at highest risk of
being scalded.
Feel water before bathing or showering.
Temperature limiting valves are recommended.
V) MAINTENANCE
Do not attempt to operate this water heater
with the cold water inlet valve closed.
Manually operate temperature and pressure
relief valve at least once a year. Standing
clear of the outlet, (discharge water will be
hot), lift and release the lever handle on the
temperature and pressure relief valve to
make sure the valve operates freely.
Never operate the heater if it is not com-
pletely filled with water. To make sure the
heater is filled, open the hot faucet of an
upstairs tap, until there is a full flow of water
with no air coming through the tap.
WARNING