Rinnai REU-VRM1120WD-E Installation And User Manual page 24

INSTALLATION INSTRUCTIONS
Clearance
The appliance must be in an accessible location. Sufficient clearances shall allow access to, and
removal of, all serviceable components. The following clearances should be followed.
Clearances in
Above
Behind
In Front
Sides
Below
Flue pipe
Water Supply
Where the water supply pressure exceeds 10 bar, an approved pressure reducing device must be fit at
the inlet of the appliance. To achieve the maximum rated flow a minimum water supply pressure of 1.2
bar is required at the appliance inlet. The unit will operate at lower supply pressures but the maximum
flow rate will not be achieved. Most installations will use high temperature setpoints which will reduce the
available flow rate and heat exchanger pressure drop, and therefore less pressure will be required at the
inlet. See the pressure chart on page 39.
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 page 25. An approved isolation valve and
strainer MUST be installed in the cold water inlet pipe. An approved isolation 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 local 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 35.
If the heater is in a hard water area a suitable water conditioning device must 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.
Description pH
Maximum Recom-
6.5 - 9.0
mended Levels
Gas Connection
Check pipe sizing required for the heater input. The heat input for the water heater is shown on page 35.
The size of the gas meter (or regulator) 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 230V AC – 50Hz mains only and all wiring
must be carried out to local regulations.
From Combustibles
300
0
600
150
300
-
Total Dis-
Total Hard-
solved Solids
ness
(TDS)
600 mg/litre 150 mg/litre
From Non-Combustibles
Chlorides Magnesium
300 mg/litre 10 mg/litre
24
50
0
600
15
50
-
Calcium Sodium
20 mg/litre 150 mg/litre
Iron
1 mg/litre