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Installation Manual
Water Piping
Please ensure this appliance does not receive inlet water greater than 85°C when used as a Solar booster.
Installation and service must be performed by a qualified plumber.
Observe all applicable codes.
This appliance is suitable for potable water applications. Do not use this appliance if any part has been underwater.
Immediately call a qualifi ed service technician to inspect the appliance and replace any part of the control system
and gas control which has been under water.
Piping and components connected to the water heater shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment, shall not be introduced into the potable water.
A water heater used to supply potable water may not be connected to any heating system or components
previously used with a nonpotable water heating appliance.
When water is required in one part of the system at a higher temperature than in the rest of the system, means
such as a mixing valve shall be installed to temper the water to reduce the scald hazard.
• Flush water through the pipe to clean out metal powder, sand and dirt before connecting it.
• Perform the following insulation measures for prevention of freezing.
• Take appropriate heat insulation measures (e.g., wrapping with heat
insulation materials, using electric heaters) according to the climate
of the region to prevent the pipe from freezing.
• Make sure that there are no water leaks from the cold and hot water
supply pipes, then insulate the pipes completely.
• Be sure to also completely insulate the water supply valve and the
cold and hot water connections on the water heater (refer to the
fi gure on the right).
• Do not cover the water drain plug with insulation so that water in the
pipe can be drained. (Refer to the fi gure in the right.)
• Use a union coupling for connecting the pipes to reduce the force applied to the piping.
• When feed water pressure is too high, insert a depressurizing valve, or take water hammer prevention measure.
• Avoid using joints as much as possible to keep the piping simple.
• Avoid piping in which an air lock can occur.
• Use approved piping materials.
• If installing the unit on a roof (Above lower-level hot water supply):
If the unit is installed on a roof to supply water to the levels below, make sure that the water pressure supplied
to the unit does not drop below 199 kPa. It may be necessary to install a pump system to ensure that the water
pressure is maintained at this level.
Check the pressure before putting the unit into operation.
Failure to supply the proper pressure to the unit may result in noisy operation, shorter lifetime of the unit, and may
cause the unit to shut down frequently.
Completely insulate
the water inlet and
outlet fittings.
Insulate the water
supply valve completely.
Do not cover the water
drain plug with insulation
so that water in the pipe
can be drained.
Supply water piping
• Do not use PVC, iron, or any piping which has been treated with chromates, boiler seal or other chemicals.
• Pipe sizing from the cold water supply should be sized according to local BY LAWS for water supply.
• If sludge or foreign matter is present in the water supply it is recommended that a separate fi lter/strainer be
fi tted to the cold water supply line.
• A GATE VALVE OR BALL VALVE must be used on the cold water inlet to the water heater. THIS
REQUIREMENT IS AN AUSTRALIA WIDE REQUIREMENT UNDER THE NATIONAL PLUMBING CODE.
STOP TAPS OR COMBINATION STOP TAPS AND NON-RETURN VALVES ARE NOT TO BE USED.
• In order for the client to use the water heater comfortably, 200 to 1000 kPa of pressure is needed from the
water supply.
Be sure to check the water pressure. If the water pressure is low, the water heater cannot perform to its full
capability, and may become a source of trouble for the client.
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