Cleaning Instructions, Flue Passages Of The Jwf657 Heater; Shut Down For Extended Periods; Re-Starting The Heater After Shut-Down - John Wood JWF307 Installation And Operating Instructions Manual

WARNING
Explosion Hazard
• If the temperature and pressure relief
valve is dripping or leaking, have a
licensed plumber repair it.
• Do not plug valve.
• Do not remove valve.
• Failure to follow these instructions can
result in death or an explosion.
Cleaning Instructions, Flue Passages Of The
JWF657 Heater
Refer to Figure 13 for components of the heater.
1. Remove the casing top and lift the insulation off com-
pletely. It is necessary to disconnect the hot and cold
water lines and move them out of the way. Do not
remove the nipples from the tank.
2. Lift off the flue collector. The flue collector has a lip on
the outer edge which will allow a hook to grab the edge
to help lift it up.
3. Remove the flue baffles (4).
4. With a 76mm (3 in.) diameter wire brush, 1.2m (4 ft.)
long, remove any soot build-up which may be on the top
head or inside the flue collector.
WIRE BRUSH
HOOK
FLUE
COLLECTOR
NIPPLES
Figure 13 Cleaning Flue Passages Of The JWF657
Heater
BAFFLE
CASING TOP
INSULATION
5. Reassemble in reverse order. It may be necessary to
replace the gaskets around the nipples to seal them at
the flue collector. Replace the insulation and the casing
top.
6. Reconnect the plumbing lines.

Shut Down For Extended Periods

When away for extended periods of time such as vacation,
and no freezing temperatures are expected:
1. Shut off the oil supply at the tank.
2. Shut off the cold water supply to the heater.
3. Turn "OFF" the electrical supply to the water heater.
4. Open an upstairs hot water faucet (to relieve any pres-
sure).
When freezing temperatures are expected:
1. Shut off the oil supply at the tank.
2. Shut off the cold water supply to the heater.
NOTE: It is recommended that all water lines
in the home be drained. Contact a qualified
plumber for directions applicable to the
heater.
3. Turn "OFF" the electrical supply to the water heater.
4. Connect a hose to the drain valve and drain as directed
in "Draining, Flushing and Sediment Removal".
5. Leave the drain hose attached as a reminder that the
tank has no water in it.

Re-Starting The Heater After Shut-Down

Hydrogen gas can be produced in a hot water system
served by this heater that has not been used for a long
period of time (generally two (2) weeks or more).
Hydrogen gas is extremely flammable and can ignite
when exposed to a spark or flame. To reduce the risk of
injury under these conditions, it is recommended that the
hot water faucet be opened for several minutes at the
kitchen sink before using any electrical appliance con-
nected to the hot water system. Use caution in opening
faucets. If hydrogen is present, there will probably be an
unusual sound such as air escaping through the pipe as
the water begins to flow. There should be no smoking or
open flame near the faucet at the time it is open.
1. Follow instructions for "Filling the Water Heater" and
"Startup" when heater is ready to be put back into ser-
vice.
2. If the heater does not start, check to see if the relay on
the burner has tripped. Reset if necessary. Check to see
if the thermostat is set at "Normal" or "High".
3. If the heater does not start:
a. Turn "OFF" the electrical supply to the water heater.
b. Shut off the oil supply at the tank.
c. Call a qualified Oil-Burner Technician.
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CAUTION