John Wood Superflue Power Vent (before FVIR technology) - Manual (Page 16)

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Figure 15 (continued)
Figure 15
Figure 13
Cast Iron Burner
1. Observe the flame pattern on the burner.
2. Observe the primary air openings of the burner.
(See Figure 14) If lint and dust have accumulated,
clean it up with a soft brush.
3. If the flame pattern is not a soft, blue flame the pri-
mary air may need adjustment:
a. Loosen the air shutter screws and open the air
shutter, to admit more primary air. If the flame
becomes hard and tends to lift away from the
burner ports, close the air shutter a little. Do
this adjustment a little at a time.
b. When you have adjusted the primary air cor-
rectly, there should not be any tendency of the
flame to lift, nor should the flame be yellow and
luminous. Slight yellow tips of the flame are
normal. Tighten the air shutter adjustment
screws.
PRIMARY AIR
CLOSED
OPEN
Figure 14
Combustion Chamber Cleaning:
THIS WILL REQUIRE SUFFICIENT TIME FOR THE
WATER HEATER TO COOL DOWN. UNPLUG THE
POWER CORD AND WAIT 1 HOUR MINIMUM. WEAR
PROTECTIVE CLOTHING (LONG SLEEVES AND
GLOVES) AS METAL COMPONENTS MAY STILL BE HOT
ENOUGH TO BURN EXPOSED SKIN.
1. Remove outer door.
2. Slide inner door open.
3. Use vacuum to clean top burner and radiation
shield.
Temperature and Pressure Relief Valve
Check the temperature and pressure relief valve (T&P
valve) to ensure that it functions properly and there is
no blockage.
Lift the operating lever to release water and let it snap
shut. The water should stop instantly upon release of
the lever.
If the temperature and pressure relief valve on the
water heater discharges periodically, this may be due
to thermal expansion in a closed water supply system.
Contact the water supplier or local plumbing inspector
on how to correct this situation.
CAUTION:
The escaping water will be hot. Stand clear. Make
sure the out–flowing water will not cause injury or
damage near the heater.
Anode and Cathodic Protection
In order to protect the tank, a magnesium anode has
been installed in the tank. Depending on local water
conditions, this anode may have to be replaced from
time to time. It is not possible to make any predictions
for the expected life of the anode. Anodes have been
known to last for 20 or more years, but sometimes
have had to be replaced in as few as 2 years.
In protecting the tank interior from rusting, the anode
will be consumed through an electrolytic action.
On a new installation, it is recommended that the
anode be inspected annually to establish a pattern of
consumption. Further inspections can be made
accordingly.
Once an anode has been consumed such that 4” or
more of the steel core wire is exposed, the anode must
be replaced.
YELLOW FLAMES
GOOD BLUE FLAMES