Rheem GAS BOOSTED SOLAR WATER HEATER - Manual (Page 31)

CONNECTIONS – PLUMBING
31
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.
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 not required unless the saturation index is greater
than +0.4 (refer to
“Water Supplies” on page 52). However, an ECV may be needed in a corrosive
water area where there are sufficient quantities of silica dissolved in the water.
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 diagram on page 29 ) . A copper drain line must be run
separately from the drain of the relief valve.
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 31). Refer to the Gas Installations Standard
AS 5601 for the correct pipe sizing.
Note: The pipe size selection must take into account
the high gas input of the gas booster
(refer to table on
page 24 ) 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. Warranty does
not cover damage of any nature resulting from failure to
observe this precaution. Refer to rating label for gas
types and pressures.
SOLAR INLET AND OUTLET
All pipe work must be cleared of foreign matter before connection and purged before attempting to
operate the water heater. All olive compression fittings must use brass or copper olives. Use thread
sealing tape or approved thread sealant on all fittings.
The solar cold outlet and solar hot inlet connections are located at the top of the solar storage tank.
Notes:
• It is important not to cross connect the solar cold and solar hot pipes to the incorrect connections.
ƒ The solar cold pipe connects to the bottom of the solar collectors and the solar hot pipe
connects to the top of the solar collectors on the opposite side to both the solar cold pipe
connection and the hot sensor connection.
ƒ The solar hot inlet connection is located in the centre of the top of the solar storage tank (the
connection is marked by a label on top of the storage tank).
ƒ The solar cold outlet connection is located toward the outer edge of the top of the solar storage
tank (the connection is marked by a label on top of the storage tank).
• Connect the solar pipes to the solar storage tank using only the fittings supplied.
gas inlet