TM049 27L Continuous Flow Service Instructions
REV AL
– Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support.
All printed copies are deemed “uncontrolled”.
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FLUING REQUIREMENTS FOR INTERNAL MODELS
As the internal models are room sealed, a coaxial flue is used to allow for both the
discharging of combustion products outside the building and supply of air for combustion
from outside of the building. It is imperative that only the Rheem approved coaxial fluing is
fitted to ensure correct and safe operation of the water heater.
Where more than one water heater is installed, each water heater must be individually flued.
A common flue system cannot be used.
Ensure the installation of the secondary flue has been carried in accordance with AS 5601,
local authority requirements and the installation instructions.
The water heater must be flued separately from all other appliances and flued to the
outdoors. Minimum clearance requirements apply from the flue terminal in accordance with
AS/NZS 5601. The flue must not discharge into a chimney.
Where the flue penetrates through walls or ceilings, the penetration must comply with local
regulations for fire rating. There is no requirement on the flue to maintain a minimum
distance from combustible materials.
The water heater flue may be terminated either horizontally with a horizontal flue terminal or
vertically with a vertical flue terminal. The secondary flue must be self-supporting and not
impose a load on the water heater.
Warning:
Never operate the water heater unless it is has been installed in accordance
with the installation instructions. Incorrect fluing of the water heater may result in unsafe
operation of the water heater, possibly causing fire, explosion, serious injury and
asphyxiation from carbon monoxide.
Maximum Flue Length
The system will not operate if there is excessive restriction (pressure drop) in the fluing
system.
The maximum permissible flue length with no bends and a terminal is 13.5m.
Each 90º bend has an equivalent length of 1.5m. For each 90º bend used subtract 1.5m from
the permissible flue length (eg: 3 x 90º bends will reduce maximum flue length to 9m).
Each 45º bend has an equivalent length of 0.75m. For each 45º bend used subtract 0.75m from
the permissible flue length.
Minimum Flue Length
The minimum horizontal flue distance which may be used is 300 mm, provided:
The flue adaptor is connected to the flue outlet of the water heater (5 star only).
one 90° elbow is connected to the flue adaptor, and
one 300 mm horizontal flue pipe is connected to the elbow, and
The horizontal flue terminal is connected to the flue pipe.
