32
teMperature-pressure relIef valve test
DANGER
• Burn hazard .
• Hot water discharge.
• Ke ep clear of Temperature-
Pressure Relief Valve
discharge outlet.
It is recommended that the Temperature-Pressure Relief Valve should be
checked to ensure that it is in operating condition every 6 months.
When checking the Temperature-Pressure Relief Valve operation, make
surethat(1)nooneisinfrontoforaroundtheoutletoftheTemperature-
PressureReliefValvedischargeline,and(2)thatwaterdischargewill
not cause any property damage, as water may be extremely hot. Use
care when operating valve as the valve may be hot.
To check the relief valve, lift lever at the end of valve several times,
see Figure 28. The valve should seat properly and operate freely.
If after manually operating the valve, it fails to completely reset and
continues to release water, immediately close the cold water inlet to
the water heater and drain the water heater, see Draining And Flushing
on page 32. Replace the Temperature-Pressure Relief Valve with a
properly rated/sized new one, see Temperature-Pressure Relief Valve
on page 15 for instructions on replacement.
DISCHARGE PIPE
TEMPERATURE-PRESSURE
RELIEF VALVE
fIGure 28.
If the Temperature-Pressure Relief Valve on the water heater weeps
or discharges periodically, this may be due to thermal expansion.
Note: Excessive water pressure is the most common cause of
Temperature-Pressure Relief Valve leakage. Excessive water system
pressureismostoften causedby“thermalexpansion”in a“closed
system.”SeeClosedWaterSystemsandThermalExpansiononpage
14-15. The Temperature-Pressure Relief Valve is not intended for the
constant relief of thermal expansion.
Temperature-Pressure Relief Valve leakage due to pressure build
up in a closed system that does not have a thermal expansion tank
installed is not covered under the limited warranty. Thermal expansion
tanks must be installed on all closed water systems.
do not pluG the teMperature-pressure relIef valve
openInG. thIs can cause propertY daMaGe, serIous
InjurY or death.

Explosion Hazard

Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized Temperature-Pressure
Relief Valve must be installed in
opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
draInInG and flushInG
It is recommended that the water heater storage tank be drained and
ushedevery6monthstoreducesedimentbuildup.Thewaterheater
should be drained if being shut down during freezing temperatures.
See Typical Installation section in this manual for location of the water
heater components described below.
DANGER
• Burn hazard .
• Hot water discharge.
• Ke ep hands clear of drain
valve discharge.
to draIn the water heater storaGe tanK:
1. Turn off the electric al supply to the water heater.
2. Tur n o ff the gas suppl y a t t he M ain Gas Shut off Valve if
the water heater is going to be shut down for an extended
period.
3. Ensure the cold water inlet va lve is open.
4. Open a nearby hot water faucet and let the water run until the
water is no longer hot.
5. Close the cold water in let valve to the water heater.
6. Connect a hose to the water heater drain valve and terminate
it to an adequate drain.
7. O pen the water he ater drai n valve a nd allow all th e water t o
drain from the storage tank.
8. Cl ose the water heater drain valve when all water in the storage
tank has drained.
9. Close the hot water faucet o pened in Step 4.
10. If the water heater is going to be shut down fo r an extended
period, the drain valve should be left open.
to flush the water heater storaGe tanK:
11. Turn off the electrical supply to the water heater.
12. Ensure the cold water inlet valve is open.
13. Open a nearby ho t water fauce t and let the wate r run until th e
water is no longer hot. Then close the hot water faucet .
14. Connect a hose to the dr ain valve and ter minate it to an
adequate drain.
15. Ensure the drain hose is secure d before and dur ing the entir e
flushing pr ocedure. Flu shing is per formed wi th system wate r
pressure applied to the water heater.
16. Open the water heater drain valve to flush the storage tank.
17. Flush the water heater storage tank to remove sediment and
allow the water to flow until it runs clean.
18. Clos e th e wat er h eat er dr ain val ve wh en f lus hin g is
completed.
19. Remove the drain hose.
20. Fill the water heater - see Filling The Water Heater in this
manual.
21. Turn on electrical supply to place water heater back in
operation.
22. Allow the water heat er to com plete seve ral heati ng cycles to
ensure it is operating properly.