Rinnai 31
HW Demand Duo Systems OIM
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 any unused cold port(s) with brass
plug).
•
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.
•
Minimum water pressure requirement is 300kPa.
•
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.
Table 1.
Pressure Ratings & Other Specifications
Cylinder Rated Pressure
(kPa)
PTR Valve Rated Pressure
(kPa)
ECV Rated Pressure
(kPa)
ECV Fitted
Fit PLV if mains
pressure exceeds:
(kPa)
Recommended PLV
pressure rating
(kPa)
850
850
700
550
500
A PLV
MUST BE
fitted if the supply pressure exceeds the limits shown. If the mains pressure is within the limits
shown fitment of the PLV is optional.
NOTE
Valves with pressure ratings other than specified are unsuitable and
MUST NOT
be used.
HOT WATER OUTLET
•
Connect hot water outlet pipe to 32mm or 50mm 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 HD 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 manifold
pipe on a Demand Duo with multiple gas water heater.
•
Appropriate gas isolation valve
MUST BE
fitted to DD1.
•
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.
Electrical Supply
•
Each water heater consumes approximately 100 Watts when in operation. It is recommended not to exceed
24 heaters on one electric supply circuit. Refer to the manual supplied with the specific water heater for exact
requirements.
INSTALLATION HANDOVER MANUAL
