Rinnai SUNMASTER Installation Manual download pdf (Page 19)

Rinnai Australia - 17 - Solar Split Systems Operating / Installation Manual

GAS BOOSTER LOCATION AND MOUNTING (where applicable)

The gas booster is designed for 'Outdoor' Installation only. As such, it must be located in an above

ground open air situation with natural ventilation, without stagnant areas, where gas leakage and

products of combustion are rapidly dispersed by wind and natural convection.



The maximum recommended combined lengths of the solar cold and solar hot pipes are as follows:

WATER SUPPLY

The minimum and maximum water pressures for the various systems are listed in Table 2. 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 document. 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/NZS3500.4 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 as detailed in Figures 7 and 8.

WATER PIPES

All hot water pipework should be insulated with sealed Polyethylene foamed or equivalent insulation

to optimise performance and energy efficiency. Such insulation may also be mandatory under local

regulations. With the exception of solar collector flow and return pipes, water pipe sizing should be

performed in accordance with AS/NZS 3500.

The collector flow and return pipes should be a minimum of 15 mm copper tube.

Plastic pipe must not be used. Plastic pipe is not suited to the high water

temperatures and pressures that may occur in the collector flow and return

system.

Table 5 - Collector Flow and return pipe sizing

Number of Collectors

Pipe Size 1-2 3 4

DN 15 (metres) 40 30 15

DN 20 (metres) Not recommended 40 20

Figure 7 - Tempered gas hot water systems Figure 8 - Tempered Electric hot water systems

WARNING

Kitchen Laundry BathroomEnsuite

TLD

Note: TLD = Temperature Limiting Device

Storage

cylinder

Cold water supply

Solar cold water inlet

Hot water outlet

Gas supply

Cold Inlet

Solar hot water return

Heated water from storage cylinder

Gas boost

Rinnai gas continuous

flow water heater for

solar applications,

preset to deliver

hot water at a fixed

temperature of 60°C or higher

Kitchen Laundry BathroomEnsuite

TLD

Note: TLD = Temperature Limiting Device

Electrically

boosted

storage

cylinder

Cold water supply

Solar cold water inlet

Solar hot water return

Heated water from storage cylinder

INSTALLATION & MAINTENANCE - ALL SYSTEMS

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