Water Supply; Hot Water Delivery Temperature; Valves And Fittings - Rinnai Enduro XL SP250B Operation & Installation Manual

WATER SUPPLY

The maximum water pressures for the various systems are listed on page 10. Approved pressure limiting valves
may be required if the 'Maximum' rated water supply pressures are exceeded. For gas boosted systems to achieve
the rated flow through the outlet of the continuous flow water heater, the minimum water supply pressures must be
supplied. The systems will operate at lower pressures but the rated flow will not be achieved.
Water chemistry and impurity limits are detailed in the separate warranty booklet. Most metropolitan water supplies
fall within these requirements. If you are unsure about water quality, contact your water authority. If sludge or
foreign matter is present in the water supply, a suitable filter should be incorporated in the water supply to the
storage cylinder.

HOT WATER DELIVERY TEMPERATURE

Local regulations and/or the requirements of AS/NZS 3500.4 must be considered regarding the temperature
limitations of hot water supplied to areas used primarily for personal hygiene. The temperature of water to these
areas is limited to 45°C for early childhood centres, primary and secondary schools and nursing homes or similar
facilities for young, aged, sick or people with disabilities and 50°C for all other buildings. To comply with these
requirements, a temperature limiting device, such as a thermostatic mixing or tempering valve, will be required on
all solar hot water systems.

VALVES AND 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. This valve is fitted near 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 is fitted on the solar pump outlet to prevent backflow through the pump from the solar
•
collectors. This valve is factory fitted.
• Elbow connections for the hot, cold and gas supply are fitted at the bottom of the gas booster.
• Fittings as shown on page 20�
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.
•
• 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 on page 10 is exceeded.
Rinnai
INSTALLATION INFORMATION
15
Low Profile Roof Mounted OIM