Anode Maintenance; To Check/Replace The Anode; Valve Washer Replacement - John Wood JW6 F307 Installation And Operating Manual

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 12). 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.
EXPOSED
SUPPORT
WIRE
PITTED ANODE ROD
Figure 12 Anode Rod
9. Apply Teflon tape, or sealing compounds approved for
®
use with potable water, to the threads of the anode(s) and
install into the tank top.
10. Open the cold water supply valve and open a nearby hot
water faucet to purge air from the water tank as directed
in "Filling The Water Heater".
11. Check for leaks. Repair as required, and re-test.
12. Replace the covers and insulation.
13. Turn on the oil supply to the water heater.
14. Turn "ON" the electrical supply to the water heater.

Valve Washer Replacement

1. Turn "OFF" the electrical supply to the water heater.
2. Turn off the oil supply to the water heater.
3. Follow instructions in the "Draining And Flushing" section
to drain the tank.
4. Turning counterclockwise ( ), remove the hex cap below
the screw handle.
Figure 13 Drain Valve washer replacement
5. Remove the washer and put the new one in place.
6. Screw the handle and cap assembly back into the drain
valve and re-tighten using a wrench. DO NOT OVER
TIGHTEN.
7. Follow the instructions in the "Filling The Water Heater"
section.
8. Check for leaks. Repair as needed.
9. Turn on the oil supply to the water heater.
10. Turn "ON" the electrical supply to the water heater.
EXPOSED
SUPPORT
WIRE
– 21 –
ALTERNATIVE
HANDLE AND
STEM HANDLE
CAP ASSEMBLY
WASHER