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 connect-
ed 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 temper-
ature and pressure relief valve (see Figure 25) 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.
Resetting and Replacing the Safety
(TCO) Switch (NG models)
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 (Figure 26) until a click sound is
generated. Do not use a metal tool or a screwdriver 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 serv-
ice technician.
Replacing the Thermocouple (TCO)
Assembly (LP models)
In LP water heaters a high temperature limit switch or TCO
(Temperature Cut Off) in the manifold assembly is used to
shut off the unit if the temperature in the combustion cham-
ber exceeds 238°C (460°F). The TCO is a single use switch
and requires replacement of the entire thermocouple. If the
TCO should operate, the water heater cannot be used until
the thermocouple is replaced by a qualified service agency.
Contact your local dealer for service information.
1.
Refer to Figure 35 to locate and identify the major com-
ponents of the manifold assembly. The LP configuration
is shown.
2.
The thermocouple routing and TCO location is impor-
tant for the proper operation of this water heater. A kit
with a replacement thermocouple, complete with bend-
ing and installation instructions, is available from
authorized distributors.
3.
Make note of the path of the faulty thermocouple before
removing it. Then follow the bending and routing
instructions, included with new thermocouple, to match
the path of the original thermocouple in your water
heater.
Important:
Do not bend the thermocouple assembly in the
section where the TCO is located.
Note:
All maintenance and service work must be performed
by a qualified service technician.
Figure 25
T&P Relief Valve Test
TEMPERATURE AND
PRESSURE RELIEF VALVE
MANUAL RELIEF VALVE
DISCHARGE LINE TO DRAIN
– 23 –
Figure 26
TCO Switch
TCO
RESET
CONTACT
THERMAL
LINK
