Water Heater Installation Manual
32 Page
WATER CONNECTIONS
Do not use this appliance if any part has been under water. Immediately contact a qualified
installer or service agency to replace a flooded water heater. Do not attempt to repair the unit!
It must be replaced!
WARNING
Do not reverse the hot outlet and cold inlet connections to the water heater. This will prevent
the water heater from activating properly.
NOTICE
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for potable
water systems.
-Pressure relief valve-
The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a Hi-Limit
switch) therefore a “pressure only” relief valve is required.
• This unit does not come with an approved pressure relief valve.
• An approved pressure relief valve must be installed on the hot water outlet.
• The pressure relief valve must conform to ANSI Z21.22/CSA 4.4 and installation must follow local codes.
• The discharge capacity must be at least 160,000 BTU/h for the 240HX3 model, 180,000 BTU/h for the
340HX3 model, and 199,000 BTU/h for the 540HX3 model.
• The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa).
• The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash out-
ward and cause damage or personal injury.
• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 in (152
mm) from the floor. This discharge tube must allow free and complete drainage without any restrictions.
WARNING! Do Not plug the pressure relief valve.
• If the pressure relief valve discharges periodically, this may be due to thermal expansion in a closed water
supply system. Contact the water supplier or a local plumbing professional on how to correct this situation.
• The pressure relief valve must be manually operated periodically to check for correct operation. Before
operating the valve manually, check that it will discharge in a place for secure disposal.
• No valve must be placed between the relief valve and the water heater.
WARNING
Hot water could be released when the pressure relief valve is opened. This could
result in severe personal injury. Before operating the pressure relief valve manually,
check that it will discharge in a safe place. If water does not flow freely from the end
of the discharge pipe, turn the gas supply and power OFF and call a qualified person
to determine the cause.
Refer to the pressure relief valve manufacturer's instructions for inspection and main-
tenance requirements.
Installaon
Installaon Manual
Cold
inlet
Hot
outlet
Gas inlet
As close as
possible
Pressure
relief valve
1.
water heater between the main water supply line and the water heater.
2. -
ter outlet of the unit.
3. If the water heater is installed within, or subjected to, a closed loop wa-
ter system, a thermal expansion tank or code approved device to handle
thermal expansion must be installed.
NOTE: If the plumbing system is subject to water hammer, then it is
recommended that water hammer arrestors be installed.
4.
purge the air from the line. Failure to do so may cause damage to the heater.
5.