INSTALLATION INSTRUCTIONS - CONNECTIONS
Water Supply.
Where the water supply pressure exceeds 12 bar, an approved pressure reducing device is required at the inlet of the appliance. To achieve the rated flow a minimum water supply pressure of 1.4 bar is required at the appliance inlet. The unit will operate at lower supply pressures but the rated flow will not be achieved. Contact Rinnai 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. An approved isolation valve and strainer MUST be installed in the cold water inlet pipe. An approved isolation valve 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. A non return valve is not required unless dictated by local regulations. A pressure relief valve should be installed in the pipework to discharge safely into a suitable drain when the system has a flow and return, or tank.
Positions of the cold water inlet, hot water outlet and gas connections are shown on page 11. All connections are ¾ inch BSP. This is NOT an indication of the pipe sizes required.
If the heater is in a hard water area a suitable water conditioning device should be in- stalled to prevent the build up of limescale within the heat exchanger. Heat exchangers damaged by scaling are not covered by the manufacturers guarantee. Guidelines are given below. If the local water exceeds these values the heater must be protected.
Description | pH | Total Dissolved | Total Hardness | Chlorides | Magnesium | Calcium | Sodium | Iron | |
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Maximum Recommended | 6.5 - 9.0 | 600 mg/litre | 200 mg/litre | 300 mg/litre | 10 mg/litre | 20 mg/litre | 150 mg/litre | 1 mg/litre | |
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Gas Connection
Check pipe sizing required for the heater input. The heat input for the Infinity 26i and HD50i is 54 kW. Refer to BS6891 (Natural Gas) and BS5482 (Propane) for guidance on correct pipe sizing calculation.
Check that the size of the gas meter and pipework will be sufficient for all appliances on the main. Sufficient gas must be available at the appliance if correct operation is to be expected. 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 the I.E.E regulations latest edition. The heater electrical supply must be provided with a fused (3A) local isolator with a contact separation of 3mm minimum on all poles for servicing. Observe polarity and ensure that wiring is correctly restrained.
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