Rheem GAS BOOSTED SOLAR WATER HEATER Service Manual download pdf (Page 39)

CONNECTIONS – PLUMBING

RELIEF VALVE DRAIN

DN15 copper drain lines must be fitted to the temperature pressure relief valve, expansion control valve (if

one is installed) and solar circuit relief valve 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.

Subject to local regulatory authority approval, the drain lines from the temperature pressure relief valve and

expansion control valve from an individual water heater may be interconnected.

The outlet of a drain line must be in such a position that flow out of the pipe can be easily seen, but arranged

so discharge will not cause injury, damage or nuisance. The termination point of a drain line must comply

with the requirements of AS/NZS 3500.4. Drain lines must not discharge into a safe tray.

In locations where water pipes are prone to freezing, drain lines must be insulated, must not exceed 300 mm

in length and are to discharge into a tundish through an air gap of between 75 mm and 150 mm.

If a drain line discharges into a tundish, the drain line from the tundish must be not less than DN20. The drain

line from a tundish must meet the same requirements as for a drain line from a relief valve.

Warning: As the function of the temperature pressure relief valve on this water heater is to discharge

high temperature water under certain conditions, it is strongly recommended the pipe work downstream of

the relief valve be capable of carrying water exceeding 93°C. Failure to observe this precaution may result in

damage to pipe work and property.

GAS INLET

The gas connection is made at the underside of the gas

booster. The pipe work must be cleared of foreign matter

before connection and purged before attempting to

operate the water heater. An isolation valve and

disconnection union must be installed to allow servicing

and removal of the water heater (refer to the diagram on

page 39).

Note: Refer to the Gas Installations Standard AS 5601 or

AS/NZS 5601.1 for the correct method of sizing the gas

supply pipe to the water heater. The pipe size selection

must take into account the high gas input of the gas

booster (refer to table on page 27) as well as all of the

other gas appliances in the premises.

Warning: Always isolate the gas booster before

pressure testing the gas supply system. Disconnect the

gas booster after the isolating cock to prevent the risk of

serious damage to the gas control. The Rheem warranty

does not cover damage of any nature resulting from failure

to observe this precaution. Refer to rating label for gas

types and pressures.

gas inlet

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Rheem GAS BOOSTED SOLAR WATER HEATER Service Manual Page 39

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