Rheem GAS BOOSTED SOLAR WATER HEATER Specifications download pdf (Page 37)

CONNECTIONS – PLUMBING

This water heater has either a plastic dip tube or fitting liner in the inlet

and outlet fittings (see diagram). These must be in place for the water

heater to function properly. Do not remove or damage them by using

heat nearby. They will be pushed into the correct position as the fitting

is screwed in.

The solar cold pipe connects to the DN15 pipe protruding from the side

of the air duct on the solar storage tank. Use the compression fitting

supplied. The solar hot pipe connects to the raised inlet located above

the cold water inlet and below the hot water outlet (refer to “Assembly

of Solar Hot and Solar Cold Pipe Connections” diagram on page 31).

PIPE SIZES

To achieve true mains pressure operation, the cold water line to the water heater should be the same size or

bigger than the hot water line from the water heater.

The pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing

the most suitable pipe size for each individual application. Reference to the technical specifications of the

water heater and local regulatory authority requirements must be made.

TEMPERATURE PRESSURE RELIEF VALVE

The temperature pressure relief valve is shipped behind the front cover of the solar storage tank. The

temperature pressure relief valve must be fitted before the water heater is operated. Before fitting the relief

valve, make sure the probe has not been bent. Seal the thread with Teflon tape - never hemp. Make sure the

tape does not hang over the end of the thread.

Screw the valve into the correct opening (refer to the installation diagram on page 30) leaving the valve drain

pointing downwards. Do not use a wrench on the valve body - use the spanner flats provided. A copper drain

line must be fitted to the temperature pressure relief valve (refer to "Relief Valve Drain" on page 37).

The valve must be insulated with closed cell polymer insulation or similar (minimum thickness 9 mm) and the

insulation installed so as not to impede the operation of the valve. The insulation must be weatherproof and

UV resistant if exposed.

EXPANSION CONTROL VALVE

Local regulations may make it mandatory to install an expansion control valve (ECV) in the cold water line to

the water heater. In other areas, an ECV is required if the saturation index is greater than +0.4 (refer to

“Water Supplies” on page 17).

The expansion control valve must always be installed after the non return valve and be the last valve

installed prior to the water heater (refer to diagrams on page 36). A copper drain line must be fitted to the

expansion control valve (refer to "Relief Valve Drain" on page 37).

The valve must be insulated with closed cell polymer insulation or similar (minimum thickness 9 mm) and the

insulation installed so as not to impede the operation of the valve. The insulation must be weatherproof and

UV resistant if exposed.

RELIEF VALVE DRAIN

DN15 copper drain lines must be fitted to the temperature pressure relief valve and expansion control valve

(if one is installed) to carry the discharge clear of the water heater. Connect the drain lines to the valves

using disconnection unions. The drain line from the valve to the point of discharge should be as short as

possible, have a continuous fall all the way from the water heater to the discharge outlet and have no tap,

valves or other restrictions in the pipe work. A drain line from a relief valve must comply with the

requirements of AS/NZS 3500.4.

A drain line must be no longer than 9 metres with no more than three bends greater than 45° before

discharging at an outlet or air break. The maximum length of 9 metres for a drain line is reduced by 1 metre

for each additional bend required of greater than 45°, up to a maximum of three additional bends. Where the

distance to the point of final discharge exceeds this length, the drain line can discharge into a tundish.

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Rheem GAS BOOSTED SOLAR WATER HEATER Specifications Page 37

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