Installation Instructions
8.Water Piping
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 qualified 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 |
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insulation materials, using electric heaters) according to the climate of | Completely insulate � |
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| Do not cover the water � | |||
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the region to prevent the pipe from freezing. | the water inlet and � |
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| drain plug with insulation� � | |||
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• Make sure that there are no water leaks from the cold and hot water | outlet fittings.� |
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| so that water in the pipe � | ||||
supply pipes, then insulate the pipes completely. |
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| can be drained. | ||
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• Be sure to also completely insulate the water supply valve and the |
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| Insulate the water � | |
cold and hot water connections on the water heater (refer to the figure |
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on the right). |
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| supply valve completely. | |
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•Do not cover the water drain plug with insulation so that water in the pipe can be drained. (Refer to the figure 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
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.
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