Rheem GAS BOOSTED SOLAR WATER HEATER - Manual (Page 30)

CONNECTIONS – PLUMBING
30
This solar storage tank 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.
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 tempered water and hot water lines from the water heater. The minimum
recommended tempered pipe and hot pipe sizes are DN20.
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.
RELIEF VALVE
The temperature pressure relief valve is shipped behind the lower front cover of the water heater. 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 25 ) leaving the valve
outlet pointing downwards. Do not use a wrench on the valve body - use the spanner flats provided.
RELIEF VALVE DRAIN
Temperature Pressure Relief Valve
A copper drain line must be fitted to the relief valve to carry the discharge clear of the water heater.
Connect the drain line to the relief valve using a disconnection union. The pipe work from the relief
valve to the drain should be as short as possible and fall all the way from the water heater with no
restrictions. It should have no more than three right angle bends in it. Use DN15 pipe.
The outlet of the drain line must be in such a position that flow out of the pipe can be easily seen (refer
to AS/NZS 3500.4) - but arranged so hot water discharge will not cause injury, damage or nuisance.
The drain line must discharge at an outlet or air break not more than 9 metres from the relief valve.
In locations where water pipes are prone to freezing, the drain line must be insulated and not exceed
300 mm in length. In this instance, the drain line is to discharge into a tundish through an air gap of
between 75 mm and 150 mm.
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.
Solar Circuit Relief Valve
Ensure the outlet of the solar circuit relief valve is facing toward the rear of the water heater installation.
A copper drain line must be fitted to the relief valve to carry the discharge clear of the water heater.
Connect the drain line to the relief valve using a disconnection union. The pipe work from the relief
valve to the drain should be as short as possible and fall all the way from the water heater with no
restrictions. It should have no more than three right angle bends in it. Use DN10 pipe.
The outlet of the drain line must be in such a position that flow out of the pipe can be easily seen (refer
to AS/NZS 3500.4) - but arranged so hot water discharge will not cause injury, damage or nuisance.
The drain line must discharge at an outlet or air break not more than 9 metres from the relief valve.