Routine Preventative Maintenance; Draining And Flushing; Temperature And Pressure Relief Valve - John Wood JW6 F307 Installation And Operating Manual

Routine Preventative Maintenance (By Owner/
Operator)
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 combustible
material, gasoline and other flammable vapours 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).

Draining And Flushing

DANGER
HOT
HOT
BURN
It is recommended that the tank be drained and flushed
every 6 months to remove sediment that may build up during
operation. The water heater should be drained if being shut
down during freezing temperatures. To drain the tank, perform
the following steps:
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 inlet valve.
4. Open a nearby hot water faucet.
5. Connect a hose to the drain valve and terminate it to an
adequate drain.
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 11). 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
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.
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.
DANGER
HOT
HOT
BURN
Figure 11 T&P Valve Test
– 20 –
• Burn hazard.
• Hot water discharge.
• Keep clear of
temperature-pressure
relief valve discharge.
WARNING
Explosion Hazard
•
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.