Valves & Fittings - Rinnai SPLIT SOLAR Operation & Installation Manual

INSTALLATION & MAINTENANCE - ALL SYSTEMS
VALVES & FITTINGS
The following valves and fittings are supplied with your solar hot water system:
• A combined pressure and temperature (PTR) relief valve, capacity 10 kW.
Relief valve pressure settings vary with models. This valve is fitted at the top of the storage
cylinder. The PTR valve is a safety device and it is mandatory that it is fitted by the installer in all
installations.
•
A non return valve fitted on the solar pump outlet to prevent backflow through the pump from
the solar collectors. This valve is factory connected.
•
For gas boosted systems, elbow connections for the hot, cold and gas supply are fitted at the
bottom of the gas booster.
•
Fittings as shown in Figures 32 to 37 and 42 to 45.
The following valves & fittings are to be supplied by the installer:
•
A cold water expansion control valve (ECV). An ECV must be fitted in Western Australia and
South Australia to the cold water supply to the storage cylinder to comply with local regulations.
An ECV is recommended in all other geographical areas where the water supply has a
tendency to cause scaling. This will reduce hot water discharge from the Pressure and
Temperature Relief (PTR) valve which minimises wear on this valve.
• A stop cock, non return valve and line strainer. Combination valves incorporating two or more
of these functions (such as 'Trio' valves) are suitable. These are fitted to the cold water supply
to the storage cylinder by the installer.
• Cold water supply and hot water discharge pipework to and from the storage cylinder.
• Solar collector flow and return pipes and storage cylinder connections.
•
An isolating valve and connection union for the gas supply to the gas booster.
•
An approved pressure limiting valve (supplied with some systems) is required if the maximum
rated water supply pressure in Table 2 is exceeded.
Rinnai Australia - 20 - Solar Split Systems Operating / Installation Manual - Version 9 - 21/11/12