Rinnai HD70e - Manual (Page 7)

7
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 Rinnai Infinity 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 9. All connections are 3/4
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.
Gas Connection
Check pipe sizing required for the heater input. The heat input for the Infinity 32e and
HD70e is 69 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.
Description pH
Total Dissolved
Solids (TDS)
Total Hardness Chlorides Magnesium Calcium Sodium Iron
Maximum Recommended
Levels
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