25
Supply water piping
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Do not use PVC, iron, or any piping which has been
treated with chromates, boiler seal or other chemicals.
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Mount a check valve and a shut off valve (near the inlet).
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comfortably, 98.1 to 491 kPa (14 to 70 PSI) 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.
Drain piping
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relief valve and wet the floor.
If necessary, provide drain piping or use a
drain hose to remove the water.
Hot water piping
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has been treated with chromates, boiler seal or
other chemicals.
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Try to make the piping as short as possible.
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Use shower heads with low pressure loss.
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ensure that the supply water pressure to the
inlet of the heater does not fall below 29 PSI
when the maximum amount of water is being
demanded. Also install a pressure meter on
the inlet. If this is not done, local boiling will
occur inside the water heater causing abnormal
sounds and decreasing the durability of the
heat exchanger.
Freeze Prevention
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is below -30°F (-35°C).
* When combustion air is supplied from the indoors, the room temperature must be greater than 32°F (0°C)
to prevent freezing and the room inside must not have negative pressure.
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of -30°F (-35°C) or below, then additional freeze protection measures must be used. For temporary
freeze protection measures, refer to the Use and Care Manual.
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Protect this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers.
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