Rinnai REU - 16 FUA - E - Manual (Page 26)

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INSTALLATION INSTRUCTIONS - CONNECTIONS
Water Supply.
Where the water supply pressure exceeds 7 bar, an approved pressure reducing
device is required at the inlet of the appliance. To achieve the maximum rated flow a
minimum water supply pressure of 1.1 bar is required at the appliance inlet. The unit will
operate at lower supply pressures but the maximum flow rate will not be achieved. Contact
Rinnai or your supplier for 'gravity fed' or 'low pressure' hot water installations.
Water pipe sizing and layout should be designed correctly to ensure the given water flows
from the appliance are available. All hot water pipework should be insulated to optimise
maximum performance and energy efficiency.
Water Connection.
Connect the hot and cold water supply pipes as shown on the following page. An approved
isolation valve and strainer MUST be installed in the cold water inlet pipe. An approved iso-
lation valve and draining point should be installed in the hot water outlet pipe. There must
be a union or release fitting on the heater side of the isolation valves. An unvented kit to lo-
cal regulations must be installed in the pipework when the system is closed (i.e. has a flow
and return, or tank.)
Positions of the cold water inlet, hot water outlet and gas connections are shown on page
41.
If the heater is in a hard water area a suitable water conditioning device should be installed
to prevent the build up of limescale within the heat exchanger. Heat exchangers damaged
by scaling are not covered by the manufacturer’s warranty.
Gas Connection
Check pipe sizing required for the heater input. The gross heat input for the Infinity 16i is
34.9 kW (G20); 29.6 kW (G25); 37 kW (G30, G31.) The size of the gas meter and pipework
must be sufficient for all appliances on the main. Sufficient gas must be available at the
appliance if correct operation is to be expected; insufficient gas will damage the unit. An
approved gas isolation valve must be fitted at the gas inlet. A union or release fitting should
be installed after the isolation valve.
Electrical Connection
The appliance must be earthed. The appliance is suitable for 230VAC – 50Hz mains only
and all wiring must be carried out to local regulations.
Description pH
Total Dissolved
Solids (TDS)
Total Hardness Chlorides Magnesium Calcium Sodium Iron
Maximum Recommended
Levels
6.5 - 9.0 600 mg/litre 150 mg/litre 300 mg/litre 10 mg/litre 20 mg/litre 150 mg/litre 1 mg/litre