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5. Install a shut-off valve in the cold water inlet line. It
should be located close to the water heater and be eas-
ily accessible. The owner/operator must be shown the
location of this valve and be given instructions on how
to use it to shut off the water to the heater.
Filling the Water Heater
Do not insert the power cord into the electrical receptacle
until all the following steps have been completed.
1. Make sure the drain valve is closed.
2. Open all hot water faucets served by the system to
allow air to escape from the tank.
3. Open the cold water inlet valve.
NOTE: When filling, avoid water leakage. Do not allow the
insulation of the water heater to get wet as water can reduce
the effectiveness of the insulation.
4. When an uninterrupted stream of water, without appar-
ent air bubbles, flows from the open hot water faucets,
the tank is full.
5. Close the hot water faucets and check the system for
leaks. Repair as required and retest.
6. Connect a hose to the drain valve and route to a suit-
able drain.
7. Open the drain valve and let water run to flush out any
foreign matter that may have entered the system.
Continue flushing until clean water flows.
8. Close the drain valve, disconnect the hose, ensure the
drain valve does not drip and re-fill the tank.
Please note the following:
DO NOT install this water heater with iron piping. The sys-
tem should be installed only with piping that is suitable for
potable (drinkable) water such as copper, CPVC or poly-
butylene. DO NOT use PVC water piping.
DO NOT use any pumps, valves, or fittings that are not
compatible with potable water.
DO NOT use valves that may cause excessive restriction to
water flow. Use full flow ball or gate valves only.
DO NOT use any lead based solder in potable water lines.
Use appropriate tin-antimony or other equivalent material.
DO NOT tamper with the gas control/thermostat, igniter,
flammable vapour sensor or temperature and pressure
relief valve. Tampering voids all warranties. Only qualified
service technicians should service these components.
DO NOT use with piping that has been treated with chro-
mates, boiler seal, or other chemicals.
DO NOT add any chemicals to the system piping which will
contaminate the potable water supply.
Closed System/Thermal Expansion
Periodic discharge of the temperature and pressure relief
valve may be due to thermal expansion in a closed water
supply system. The water utility supply meter may contain a
check valve, backflow preventer or water pressure-reducing
valve. This will create a closed water system. During the
heating cycle of the water heater, the water expands caus-
ing pressure inside the water heater to increase. This may
cause the temperature and pressure relief valve to dis-
charge small quantities of hot water. To prevent this, it is
recommended that a diaphragm-type expansion tank (suit-
able for potable water) be installed on the cold water supply
line. The expansion tank must have a minimum capacity of
5.6 litres (1.5 US gallons) for every 190 litres (50 US gal-
lons) of stored water and be rated at the working pressure
of the water heater. Contact the local water supplier or
plumbing inspector for information on other methods to con-
trol this situation.
Important: Do not plug or remove the temperature and
pressure relief valve.
Temperature and Pressure (T&P) Relief Valve
For protection against excessive pressures and tempera-
tures, a temperature and pressure relief valve must be
installed in the opening marked “T&P RELIEF VALVE” (see
Figure 19). This valve must be design certified by a nation-
ally recognized testing laboratory that maintains periodic
inspection of the production of listed equipment or materials
as meeting the requirements of the “Standard For Relief
Valves For Hot Water Supply Systems”, ANSI
Z21.22/CSA 4.4”. The function of the temperature and pres-
sure relief valve is to discharge water in large quantities in
the event of excessive temperature or pressure developing
COLD
WATER
INLET
HOT
WATER
OUTLET
TEMPERING
VALVE (SET
TO 49°C
(120°F))
TEMPERED
WATER TO
FIXTURE
Figure 18 Tempering Valve Installation
FOLLOW THE
TEMPERING
VALVE MANU-
FACTURER'S
INSTRUCTIONS
T&P VALVE
AND DIS-
CHARGE
LINE
COLD WATER
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.
– 16 –