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GENERAL INSTALLATION INSTRUCTIONS
Cold Water Supply
•
Connect cold water pipe work to one of the cold inlets of tank, including required valves as
shown in diagrams on previous page to comply to AS/NZS 3500 and local regulations. (Block
unused cold port with brass plug 32 mm).
•
Maximum cold water inlet pressure is 650 kPa. Fit pressure limiting valve (rated @ 700 kPa) if
cold water inlet pressure is in excess of 650 kPa.
•
For ease of draining, it is advisable to fit a "Tee" piece with a capped valve between the cold
water isolation valve and the cold water inlet connection on the Demand Duo storage Tank. Tap
provided.
Hot Water Outlet
•
Connect hot water outlet pipe to 32mm fitting on upper left hand side of the storage Tank with
union and isolation valve as required.
•
Ensure adequate insulation / lagging is fitted to hot water pipe to minimize heat loss.
Return Pump
•
A secondary or building return pump may be installed in conjunction with the Rinnai Demand
Duo hot water system. Pump should be sized for minimal temperature loss around the ringmain.
Pump must have a check valve on the discharge.
•
Return line from building loop is connected to the cold water supply pipe after the check valve.
From that point onwards the cold pipe should be insulated.
Gas Supply
•
Check gas type of Rinnai INFINITY matches gas supply available (LPG or Natural) on job site.
•
Gas inlet connection is located at the front bottom of the weather shroud on a DD1 and is the top
pipe on a DD2 - DD6 manifold.
•
Appropriate gas isolation valve to be fitted to DD1, DD2 - DD6 have gas isolation valves per
water heater.
•
Ensure gas pipe sizing is adequate to deliver the required volume / pressure. Pipe size used on
inlet fitting is no indication of pipe size required.
•
Refer to appropriate pipe sizing chart in Appendix "F" AS/NZS 5601 for appropriate sized gas
pipe that should be used to ensure adequate gas supply.
•
Gas meter / LPG cylinder & regulator should also be of a suitable size to ensure sufficient gas
supply to the gas installation.
•
Purge gas pipe to ensure removal of debris etc prior to final connection.
•
Check for gas escapes using suitable methods as listed in Appendix "E" AS/NZS 5601.
Filling Instructions
Do not turn on pump / gas booster before cylinder and water heater are completely full of
water.
•
Flush cold water inlet pipe to remove any debris before final connection to cold water inlet on
Rinnai Demand Duo cylinder.
•
Turn on hot water tap to allow air to be expelled while cylinder is filling with cold water.
•
Slowly open cold water isolation valve on cold water supply pipe.
•
Allow cylinder to fill. Turn off hot water tap once non-aerated water flows through hot water tap.
•
Check all connections for water leakage. Tighten as required.
•
Purge gas lines until gas is available at water heaters.
•
Prime circulating pump(s) before start up by removing chrome screw and allowing water to drip
out the end of the pump shaft.
Starting Instructions
•
Turn all GPO's ON.
•
Thermostat will initiate.
•
For standard systems "75" should appear in the maintenance monitor window on the gas heater.
When flow is created by primary pump. That is the outlet temperature from the water heater. It
must be higher then the thermostat set point.
•
Thermostat will display temperature of water in tank. When it reaches the 65°C set point the
pump and therefore, water heater will stop. The display on the water heater will not be lit when
not operating.
Rinnai Australia
22
Operation / Installation Manual
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