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Rinnai Australia 23 Operation / Installation Manual

INSTALLATION HAND OVER MANUAL

Demand Duo Principle of Operation

Cold water enters the storage tank after passing through an isolation and non return valve.

A tee is fitted to the cold inlet pipe down stream from the non return valve. From this tee, one branch

connects to the lower inlet of the storage tank and the other branch connects to the primary (tank

circulation) pump. (Not applicable to DD1 Models). This pumps water to the inlet of the INFINITY(S)

heat source. The INFINITY will only operate when this pump is running.

The heated water from the INFINITY returns to the tank at the second lowest connection point, located

above the cold inlet.

Hot water leaves the tank from the top of the tank. This may be circulated around the building and

returned, via a ringmain pump (set) to the cold inlet before the tee as described above.

When there is a hot water draw off, cold water enters the tank and pushes the hot water out of the

tank towards the outlet, as per any storage hot water system.

When the temperature in the tank drops below the thermostat set point, the thermostat activates the

primary pump(s). They draw water from the cold water feed to the tank, the tank itself, or a

combination of both. As stated previously, this water is then heated by the INFINITY and returns to

the tank heated. This process is continued until the thermostat set point is reached and the pump is

switched off.

The outlet temperature setting of the INFINITY must be set at least three (3) degrees hotter then the

thermostat set point. Factory settings are: INFINITY 75°C, Thermostat 65°C.

Thermostat Operation

• Thermostat to control the operation of primary pumps between storage tank and external heat

source, such as HD200, HD250, HDC211.

• Circuit board is housed in a plastic box with a see through front cover. Power lead with plug, two

sockets and a temperature probe on lead leave the base of the box.

• Can be set up as a DD1, where one power outlet is activated if the tank temperature drops below

set point and the other is permanently active for the HD200, HD250 or HDC211 to plug into or as

a DDCOMBO where one or both power outlets are activated if the tank temperature drops below

set point.

• Circuit board includes a display that shows measured water temperature.

• “tt” indicates tank temperature when set point is reached.

• “P” indicates that temperature has fallen below set point (less differential) and power to primary

pump(s) is activated.

• Circuit board mounted LED is lit when power outlet is active when configured to provide power to

a pump. When set as power supply to HD, as a DD1, LED is not lit when power outlet is active.

• Pump load per power outlet is maximum 1000 watts. Total power supply to run both pumps

simultaneously is 7.5 Amps. Confirm with pump details.

• Available temperature set points are 65°C, 70°C, 75°C, and 80°C.

• Available temperature differentials are -3°C and -5°C.

• Example: if temperature set point is 65°C and differential is -3°C pump will be switched on when

temperature is below 62°C and is switched off when temperature reaches 65°C

• Start up sequence for above example will initiate then show: Low: 62, High: 65.

• This sends power to the tank mounted GPO (or direct to the primary pump on a DD1). This will

start the operation of the primary pump(s).

• Ensure thermostat sensor is pushed all the way into the well in the tank.

• Check that power is available at pump or GPO if necessary.

Demand Duo Preventative Maintenance

All Items

• Inspect for damage, corrosion or water leaks.

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