Bosch BC3200RA5 Installation Manual download pdf (Page 15)

Installation Instructions

9. Water Piping

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.

If the water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold

water supply line, means shall be provided to control thermal expansion. Contact the water supplier or a local plumb-

ing inspector on how to control this situation.

This pressure relief valve must be capable of an hourly J rated temperature steam discharge of 250 MJ/h. Multiple

valves may be used. The pressure relief capacity must not exceed 1029 kPa. The relief valve must be installed such

that the discharge will be conducted to a suitable place for disposal when relief occurs. No reducing coupling or other

restriction may be installed in the discharge line. The discharge line must be installed to allow complete drainage of

both the valve and the line.

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.

Installation and service must be performed

by a qualified plumber.

Observe all applicable codes.

• 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 figure

on the right).

• 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 pressure reducing 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.

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Bosch BC3200RA5 Installation Manual Page 15

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