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HORIZONTAL TERMINATING FLUES
These installations utilise the heater-mounted blower to vent the combustion products to the outdoors.
Combustion air is taken from inside the room and the flue terminal is installed horizontally through the
wall to the outdoors. Adequate combustion and ventilation air must be supplied to the equipment room
in accordance with AS/NZS 5601.1.
Refer to
on page 47 for the maximum length of flue run.
Lubricant is available to lubricate the flue gaskets for ease of installation. DO NOT use soapy water.
1. Fit the flue adaptor to the flue outlet located at the bottom back of the water heater and seal with
the screw clamp (supplied).
2. Fit one of the condensate drain/port sections with the drain pointing towards the ground and secure
to the adaptor with the clamp.
Note: the clamp will only fit one way. DO NOT try to force the clamp to close. If it is not
closing, it is the wrong way. If forced, be careful to use a screwdriver to release the clamp
as the releasing pressure may cause injury if attempting to release by hand.
3. The second flue drain/port section will be used to analyse the products of combustion during
commissioning and the port must be a minimum of 300mm away from the water heater flue outlet.
Fit the drain/port section (with the port NOT pointing towards the ground), straight flue lengths
and/or elbows and run to the terminal location. Secure each joint with the clamp.
4. Horizontal flue runs must have an upward slope towards the flue terminal of not less 1 in 20 or
50mm per linear meter. The horizontal portions of the flue shall also be supported every 1.5m to
maintain clearances and to prevent physical damage or separation of joints.
5. Use appropriate flue lengths or adjustable lengths to achieve the desired outcome. DO NOT cut
the flue.
6. Install a rust-resistant sheet metal backing plate against the outside face of brick or masonry
surfaces.
7. The Rheem supplied horizontal flue terminal MUST be used. Fit the horizontal flue terminal on the
other side of the wall and secure to the flue pipe with the supplied screw clamp. The flue terminal
can be cut to length as required and debur.
8. The flue terminal must be installed at least 300mm above ground level and above normal snow
levels and must not be installed in a well or below grade. The flue terminal must be located NO
CLOSER than 300mm off the wall. An obstruction in the direction of discharge must be no closer
than 1.5m.
9. For multiple water heater installations, observe the clearances as shown in Fig 18 on page 45.
10. Fit the condensate trap to the condensate drain section and fill with water.
ROOM SEALED AIR SUPPLY
These installations utilise the heater-mounted blower to draw combustion air in from the outdoors and
vent the combustion products to the outdoors.
Combustion air and flue venting may terminate horizontally or vertically and do not need to be located
on the same face of the building. The air intake MUST be at least 900mm below the bottom of the flue
terminal. Failure to observe this may allow products of combustion to be drawn back into the air inlet of
the water heater and will void warranty. Whilst air supply for combustion is drawn directly from the
outdoors, ventilation may still be required to maintain temperatures within the room per AS/NZS 5601.1.
