Installation guide
20
DOMESTIC INSTALLATION GUIDE
2d: Pressure and Temperature Relief (PTR) Valve
a. The Pressure and Temperature Relief Valve (see tank label for rating), which is supplied with
the unit, must be fitted and made accessible so that the release mechanism can be operated and,
if required, the valve replaced.
b. The outlet of the PTR Valve must be suitably drained to remove the water discharged during the normal heating
cycle. The valve thread is RP ½”/15mm and must be installed into the top front socket.
Warning: A separate drain line must be run for this relief valve. It is not permitted to couple the drain lines
from the relief valve and evaporator into a single common line. The use of a tundish under the evaporator
drain with this then connected to the drain of the PTR valve is acceptable.
2e: Expansion Control Valve (ECV)
a. Where an Expansion Control Valve is fitted to the cold water supply, the ECV should be rated at 150kPa lower than
the Pressure & Temperature Relief (PTR) Valve.
b. It is a State requirement for SA & QLD that an ECV be fitted on the cold water supply line between the
non-return valve and the water heater.
2f: Cold Water Connection
a. An approved isolating valve, approved non-return valve and union must be fitted between the supply main and the
RP ¾”/20mm socket in the water heater.
b. All fittings must be approved by the relevant Authority.
2g: Pressure Limiting Valve
a. This water heater is designed for direct connection to a maximum water supply pressure of 800kPa. Where the
mains pressure can exceed or fluctuate beyond this pressure, a pressure-limiting device (complying with AS1357)
must be fitted in the cold-water supply line.
b. This device must be installed after the isolating valve and set at or below 500kPa (or 350kPa if an 850kPa
ECV is fitted).
c. An ECV is fitted when the water supply has a tendency to form scale. The fitting of an ECV is mandatory in WA,
SA and some other areas of Australia as dictated by local regulations.
2h: Caution Regarding Glass Lining of Tank
a. When making the hot and cold water connections to the tank care should be taken not to apply
excessive strain as damage to the tank spigots or glass lining may occur.
2i: Suitability for Installation in Frost Areas
a. The R134a refrigerant used has a boiling point of -26ºC. Therefore, there is no risk of damage to the heat pump
from frost. Performance may be reduced in very low temperatures, but the system will not be damaged.
2j: Hot Water Connection
a. The hot water pipe should be connected to the RP ¾”/20mm socket as shown in the Installation Diagram
(Figures 1 & 2).
b. It is recommended that all hot and cold water lines be insulated.
c. NOTE: Plugs are supplied with the water heater to plug off the inlet/outlet entries that are not required. Ensure that
adequate sealing is applied to the plugs for a tight, leak-proof seal.