Rinnai HDC 1600i Low NOX Installation And User Manual page 25

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
mm
Internal Units
Above 152
Behind 0
In Front 152
Sides 51
Below 305
Flue pipe / 0
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 2.5 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 50. 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 27. An approved isolation
valve and strainer MUST be installed in the cold water inlet pipe. A pressure relief valve
included in the carton box and 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 43-44.
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
Solids (TDS)
Maximum
Recommended 6.5-9.0 600 mg/litre
Levels
Gas Connection
Check pipe sizing required for the heater input. The heat input for the water heater is shown
on page 45. 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
External Units
305
0
610
152
305
610
Total
Total
Dissolved
Hardness
150 mg/litre
From Non-Combustibles
Internal Units
51
0
152
13
305
0
Chlorides Magnesium Calcium
300 mg/litre 10 mg/litre
25
External Units
50
0
0
5
51
610
Sodium Iron
20 mg/
150 mg/litre 1 mg/litre
litre