Rheem GAS BOOSTED SOLAR WATER HEATER Service Manual download pdf (Page 23)

INSTALLATION – SOLAR STORAGE TANK

TANK WATER SUPPLY

If the water heater is supplied with water from a tank supply and a minimum water supply pressure of

140 kPa at the water heater cannot be achieved, then a pressure pump system must be installed to allow the

gas booster to achieve its rated flow and performance. Care must be taken to avoid air locks. The cold water

line from the supply tank should be adequately sized and fitted with a full flow gate valve or ball valve.

RAIN WATER TANK

If the solar collectors and solar pipe work are to be installed on a section of roof which is part of a rain water

runoff collection system, then it is recommended this section of roof and its gutter be isolated from the rain

water collection system. The gutter should be isolated to a width greater than the solar collectors and pipe

work and must have suitable drainage. The installer should ensure in the event of a leak from the solar

collectors or pipe work, a rainwater tank cannot be contaminated with closed circuit fluid.

The section of roof and gutter should be isolated from the rainwater collection system before the

commissioning of the solar water heater, so that any leak or spillage during commissioning does not make its

way into the rainwater tank.

This section of roof and guttering can be isolated by either:

blocking this section of gutter from the remaining gutter and fitting two separate down pipes, one to take

any run-off water from that section of roof away to drain and the other to the rainwater collection side of

the gutter to take the rain water runoff to the rain water tank.

blocking this section of gutter from the remaining gutter and fitting a tube or pipe of a material

compatible with the gutter material in this section of the gutter and penetrating the separation pieces at

either end to allow rainwater runoff to pass from one part of the rainwater collection system to the other.

It may be necessary to fit a down pipe to the section of blocked gutter to take any run-off water from that

section of roof away to drain.

installing a false gutter inside of the existing gutter, with a down pipe penetrating the existing gutter to

take any run-off water from that section of roof away to drain. The false gutter should be no deeper than

half of the depth of the existing gutter, so as to enable rain water runoff to flow under the false gutter.

installing a flashing from the underside of the roofing material, with a continuous fall, to over the outside

lip of the gutter. The flashing should extend wider than the collectors and pipe work and turned up at the

ends so if there is leakage of closed circuit fluid, it cannot enter the gutter.

If any of these solutions are not practical, then the installer should discuss alternative options to suit the

installation with the house holder.

Any alterations to the roof drainage system must comply with the relevant building regulations, codes and

Standards.

FREEZE PROTECTION

The water heater has a freeze protection system. The water heater is not suitable for installation in areas

where the ambient temperature falls below -20°C (including wind chill factor).

The solar circuit must be installed with a continuous fall of a minimum 5° (1 in 10 grade) in the pipe work

from the solar collector to the solar storage tank, with the full length of the solar hot and solar cold pipes

insulated and the system charged with correctly mixed closed circuit fluid to offer protection against freeze

damage. The system has NO WARRANTY for freeze damage if there is not a continuous fall in the solar hot

and solar cold pipes, or they are not insulated in accordance with the installation instructions, or the closed

circuit fluid has been incorrectly mixed (refer to “Terms of the Rheem Warranty” on page 63 and to “Warning:

Plumber Be Aware” on page 31).

The solar collector and solar cold and solar hot pipes only contain closed circuit fluid when the pump is

operating during periods of solar gain when heating is required. When the solar pump stops operating, the

closed circuit fluid drains back into the storage tank heat exchanger. The closed circuit fluid is an anti-freeze

agent which, when mixed to the correct specification, can withstand temperatures of -20°C before it may

freeze.

The frost protection system to the gas booster will protect the gas booster from damage, by preventing ice

forming in the waterways of the gas booster, in the event of freezing conditions occurring. The frost

protection system will be rendered inoperable if electrical power is not available at the gas booster. Damage

to the gas booster caused by freezing of the pipe work to or from the gas booster is not covered under the

Rheem warranty. Refer to AS/NZS 3500.4 for precautions to be taken for installations in frost prone areas.

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Rheem GAS BOOSTED SOLAR WATER HEATER Service Manual Page 23

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