Figure 13
Flame Arrestor (External View)
FLAME
ARRESTOR
Cleaning the Combustion Chamber and
Flame-arrestor
1. Follow procedure outlined in “Removing the Manifold/
Burner Assembly”.
2. Use a vacuum cleaner/shop vac to remove all loose
debris in the combustion chamber (see Figure 14). Use
compressed air to clear any dust or debris that may
have accumulated in the flame-arrestor.
3. Reassemble following the procedure under “Replacing
the Manifold/Burner Assembly”.
DOOR GASKET
FLAME ARRESTOR
COMBUSTION CHAMBER
BASE-RING
FILTER
Figure 14
Combustion Chamber
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. To
prevent water damage, the valve must be properly con-
nected to a discharge line which terminates at an adequate
drain. Standing clear of the outlet (discharged water may
be hot), slowly lift and release the lever handle on the tem-
perature and pressure relief valve (see Figure 15) 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 shut-off valve
and the cold water inlet and call a qualified service techni-
cian.
Figure 15
T&P Relief Valve Test
TEMPERATURE AND
PRESSURE RELIEF VALVE
MANUAL RELIEF VALVE
DISCHARGE LINE TO DRAIN
Resetting and Replacing the Safety
(TCO) Switch (NG models)
Figure 16
TCO
Switch
TCO
RESET
CONTACT
THERMAL
LINK
The (NG) water heater safety system includes a door-
mount, manual resettable, safety switch which is designed
to disable the gas control/thermostat in the event of exces-
sive combustion chamber temperatures. The excessive
combustion chamber temperatures may be generated by
accumulation of lint and dust on the flame-arrestor (located
underneath the combustion chamber).
1. Follow first the procedure outlined in "External Cleaning
of the Flame-arrestor".
2. Remove the outer door and locate the TCO switch on
the right side of the combustion chamber door.
3. Manually press the contact located on the front-right
side of the TCO switch (see Figure 16) until a click
sound is generated. Do not use a metal tool or a screw-
driver to press the TCO switch contact.
4. Verify if the quick connects are firmly inserted in the
TCO switch contacts.
5. Replace the outer door.
6. Restart the water heater following the “Operating
Instructions”.
7. If the pilot burner does not stay lit after several attempts
it is possible that the TCO embedded in the safety
switch opened due to a flammable vapour incident or
the TCO switch was severely damaged. Do not attempt
to further operate the water heater. Call a qualified ser-
vice technician.
– 17 –
