Cooler Hardware; Bends And Elbows; Dampers; Fix And Seal The Roof Flashing - Rinnai A20 Installation Manual

3. COOLER HARDWARE

3.1 BENDS AND ELBOWS

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Where square ducting elbows are to be used, install turning vanes within the elbow to aid airflow.
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Use unrestricted ductwork with smooth changes of duct cross section.
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Bends in ducting should have a large radius and branches should have shallow angles.

3.2 DAMPERS

Dampers may be required to balance the air distribution of the duct system.

3.3 FIX AND SEAL THE ROOF FLASHING

The roof flashing MUST BE fixed and sealed to the dropper duct to prevent water entry into the building. Ensure
that the screws or rivets DO NOT protrude into the dropper duct more than 8mm.
Installations where the Cooler is more than 4m downstream from the roof peak should be fitted with an additional
water-diverting channel on the dropper duct high side, that extends beyond the dropper duct sides by at least
50mm (see diagram below).
Dropper Duct

3.4 DROPPER DUCT INSTALLATION GUIDELINES

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The dropper duct on which the Cooler is mounted MUST BE properly secured to the roof structure or timbers.
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Ensure the dropper duct does not contact the ceiling joists or other structural members that can transmit
vibration.
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If possible, the dropper duct should be positioned to the rear or on the service side of the home.
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It should also be as far down the roof as practicable.
•
Rinnai recommend installing a diffuser or cone in the base of the dropper box. This will assist distributing the
airflow evenly into the duct system and can also reduce noise levels.
Rinnai
Water diverter channel
Flashing
This diagram is for Rinnai C Series Models.
NOTE
8 Evap AC IM