John Wood Superflue Power Vent (75 Gallon) - Manual (Page 30)

Relief Valve Check
Inspect the relief valve annually to ensure proper operation.
This involves opening the valve to check that it is flowing
freely and that there are no blockages. Provide a bucket or
drainage for the expelled water. Lift the lever and let it snap
shut. The water should stop instantly.
Warning: WATER WILL BE HOT and water flow can be
forceful. If the valve does not function properly, it must be
replaced.
In systems where the relief valve discharges periodically,
this may be due to thermal expansion or to a thermostat that
is operating at too high a temperature. In a closed water
system, an expansion tank may be required Contact your
local plumbing inspector. For a malfunctioning thermostat,
contact your gas supplier.
Manually operate the temperature and pressure relief valve
at least once a year to make sure it is working properly (see
Figure 26). 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 manual gas valve and the
cold-water inlet valve and call a qualified service technician.
Vent Maintenance
• Inspect the venting system periodically (minimum twice
annually) to make certain that the vent passageways,
vent terminal and blower assembly are free and unob-
structed. Ensure that any condensate is draining freely.
Clean as necessary.
• Inspect the vent piping, elbows and connections for
signs of stress cracking or deterioration. Make certain
the venting is free to move and that all pipe hangers and
isolation supports are properly positioned and securely
attached. Replace any broken components and rectify
any installation problems.
• In areas that have a high level of airborne particulate
(e.g. lint, sawdust, process smoke, laundry areas, etc.)
inspection and cleaning may need to be done more fre-
quently. This can be problematic, especially where con-
densation is present, as particles can adhere to the
venting surfaces. Particles, especially lint can also clog
the vent blower wheel. These conditions can reduce the
venter performance resulting in nuisance failures.
• Inspect the flue collector area for signs of corrosion.
This can be an indication of contaminated air, a wet
environment, poor burner set up, or high levels of con-
densation occurring at the flue collector. Determine and
correct any poor operating conditions.
Burner Maintenance
Annually inspect the burner and combustion chamber area
to ensure that no debris has fallen on the burner and that no
foreign material has found its way into the combustion
chamber. Observe the flame for proper operation.
ALWAYS KEEP THE AREA AROUND THE WATER
HEATER CLEAR OF COMBUSTIBLE MATERIALS.
NEVER RESTRICT THE FLOW OF AIR TO THE WATER
HEATER.
– 30 –
Temperature and Pressure
Relief Valve
Manual Relief Valve
Discharge line to drain
Figure 26 T&P Valve Test
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.
LIMIT
SWITCH
WIRES
DRAFT
DIVERTER
AIR PRESSURE
TUBING
MOTOR
VENTILATION
OPENINGS
BLOWER
MOTOR
AIR INTAKE
OPENING FOR
DRAFT DIVERTER
L I M I T
SWITCH
Figure 27 Blower Maintenance