Instructions / Assembly

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Caution! The water being drained can be extremely hot!
The drain hose should be rated for at least 93°C (200°F). If
the drain hose does not have this rating, open the cold water
supply valve until the water flow is no longer hot. Close the
cold water supply valve and resume.
6. Open the water heater drain valve and allow all the water
to drain from the tank.
7. Flush the tank with water as needed to remove sediment.
8. Close the drain valve. Follow the instructions in the "Filling
The Water Heater" section to refill the tank.
9. Turn on the oil supply to the water heater.
10. Turn "ON" the electrical supply to the water heater.
If the water heater is going to be shut down for an extended
period, the drain valve should be left open.
Important: Condensation may occur when refilling the tank
and should not be confused with a tank leak.
Temperature And Pressure Relief Valve
Manually operate the temperature and pressure relief valve
at least once a year to make sure it is working properly (see
Figure 13). To prevent water damage, the valve must be
properly connected to a discharge line that terminates at
an adequate drain. Standing clear of the outlet (discharged
water may be hot), slowly lift and release the lever handle
on the temperature and pressure relief valve to allow the
valve to operate freely and return to its closed position. If
the valve fails to completely reset and continues to release
water, immediately shut off the power to the heater and the
cold water inlet valve and call a qualified service technician.
• Burn hazard.
• Hot water discharge.
• Keep clear of
temperature-pressure
relief valve discharge.
BURN
HOT
HOT
DANGER
TEMPERATURE-PRESSURE
RELIEF VALVE
DISCHARGE PIPE
Figure 13. T&P Valve Test
• Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA4.4 and ASME
code.
• Properly sized temperature-
pressure relief valve must be
installed in opening provided.
• Do not plug, block, or cap the
discharge line.
• Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.
Explosion Hazard
WARNING
Anode Maintenance
A new anode is about 20mm (13/16 in.) to 22mm (7/8 in.)
diameter and has a steel wire core approximately 3mm (1/8 in.)
diameter in the center. If the anode is less than approximately
10mm (3/8 in.) in diameter, or the inner steel core is exposed,
the anode(s) should be replaced (see Figure 14). Operating
a water heater without an actively working anode(s) will void
the warranty.
To check/replace the anode:
1. Turn "OFF" the electrical supply to the water heater.
2. Turn off the oil supply to the water heater.
3. Close the cold water supply valve.
4. Open a nearby hot water faucet served by the system to
depressurize the system.
5. Connect a hose to the drain valve and drain 22 litres (6
US gallons) as directed in "Draining And Flushing".
6. Close the drain valve.
7. Remove the anode cover, or, on JW F657, Rear and
Combination flue models, remove top cover, insulation
and flue top cover.
Note: The anode(s) has been factory installed using a power
tool. It may be necessary for a second person to stabilize the
heater. A few sharp blows on the handle of the socket wrench
should loosen the anode nut. If an impact wrench (power
drive) is available, this is an easier way to remove an anode.
8. Using a 1 1/16" socket (certain models require 1-5/16”),
remove the anode(s) and inspect it. The surface may
be rough, full of pits and crevices, but this is normal. If
it is less than approximately 10mm (3/8 in.) in diameter,
or the inner steel core exposed, the anode(s) should be
replaced.