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Rinnai Demand Duo Installation Manual

Continuous flow with storage backup
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Installation guide
Demand Duo
Continuous flow with storage backup
Customised hot water systems with 2-5
Rinnai INFINITY HD or EF commercial
continuous flow gas hot water heaters.

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Summary of Contents for Rinnai Demand Duo

  • Page 1 Installation guide Demand Duo Continuous flow with storage backup Customised hot water systems with 2-5 Rinnai INFINITY HD or EF commercial continuous flow gas hot water heaters.
  • Page 2 Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. For more information about buying, using, and servicing of Rinnai appliances call: 0800 RINNAI (0800 746 624). Rinnai New Zealand Limited 105 Pavilion Drive, Mangere, Auckland...

  • Page 3: Table Of Contents

    Before you start ..........4 Models covered ..........5 Specification summary ........6 Dimensions ............7 General layout of system ......... 8 Connections ............ 9 Individual flueing of internal units ....10 Systems with EF models - condensate drain ... 11 About the AlphaStat-Plus thermostat .....

  • Page 4: Before You Start

    Models covered Code/model Description RCWDD400E315N/L 2 x HD200 external units with a 315 litre Demand Duo cylinder RCWDD600E315N/L 3 x HD200 external units with a 315 litre Demand Duo cylinder RCWDD800E315N/L 4 x HD200 external units with a 315 litre Demand Duo cylinder...
  • Page 5 Rinnai INFINITY flue clearances Flue clearances must comply with AS/NZS 5601.1. Demand Duo systems with HDi200 and EFi250 internal units, where each unit is flued individually, must use a Rinnai approved flue system. Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 5...

  • Page 6: Specification Summary

    Specification summary All of these systems are connected to a 315 L Demand Duo cylinder. 6 | Demand Duo CFHW with storage backup installation guide: 12583-B...

  • Page 7: Dimensions

    3 x EF250/EFi250 2540 DD 840 external and internal 4 x EF250/EFi250 3280 DD 500 external 2 x HD250 2140 DD 750 external 3 x HD250 2540 Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 7...

  • Page 8: General Layout Of System

    32 mm fitting on the left hand side of the cylinder, approximately 280 mm above the ground. For ease of draining it is advisable to fit a ‘tee’ piece with a capped valve or drain line between the cold water isolation valve and cold water inlet connection on the Demand Duo cylinder. Hot water outlet 32 mm fitting on the left hand side of the cylinder.

  • Page 9: Connections

    Connections Expansion control valve (ECV) The Demand Duo cylinder comes with an Expansion Control Valve (HT575) set to 700 kPa. This valve allows for expansion of the water in the flow and return during the initial heat-up period. This should be fitted to the cold water supply line.

  • Page 10: Individual Flueing Of Internal Units

    The Rinnai INFINITY internal gas hot water heaters are room sealed appliances—sealed from the room as it takes air for combustion from the outside, and expels products of combustion outside. No ventilation in the space where the water heater is installed is required. Each Rinnai INFINITY water heater is flued individually.

  • Page 11: Systems With Ef Models - Condensate Drain

    DO NOT discharge above the roof level. onto electrical connections, earth stakes, copper pipes, concrete paths, or into a pond. Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 11...

  • Page 12: About The Alphastat-Plus Thermostat

    About the AlphaStat-Plus thermostat The Rinnai AlphaStat-Plus is a thermostat configured to switch primary pumps on water heating systems where Rinnai INFINITY continuous flow gas hot water heaters are combined with storage cylinders. It is preset when leaving Rinnai. 142 mm...

  • Page 13: Alphastat-Plus Display Panel

    The AlphaStat-Plus will remember are programmed into the controller BIOSAFE AWAY mode even if the power goes off and will need to be set. comes on again. Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 13...

  • Page 14: Filling And Draining

    6. Prime circulating pump before start up. 7. The thermostat on the Demand Duo cylinder is set to 65 °C and the Rinnai INFINITY is set to 75 °C. If the cylinder thermostat does not appear to be set correctly the thermostat may need to be reprogrammed—refer programming sheet available within the technical section...

  • Page 15: Commissioning

    Troubleshooting A full set of error codes for the Rinnai INFINITY units* and thermostat are available in the owner’s manual—separate document that is provided with the system. * Error codes are displayed in the status monitor of all commercial Rinnai INFINITY units except the HDi200 and HD250 models (no status window on these models).
  • Page 16 Experience our innovation Rinnai.co.nz 0800 746 624 http://www.youtube.com/rinnainz Demand Duo CFHW with storage backup installation guide: 12583-B http://www.facebook.com/rinnainz...

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