Rinnai SPECTRUM 28 REH281 EB Operation & Installation Manual page 22

INSTALLATION OF CONSOLE INTO TWIN SKIN FLUE
INSTRUCTIONS FOR INSTALLATION
INTO A 75MM CAVITY WALL USING
TWIN SKIN FLUE*.
Select position for heater and locate studs, there
must be a minimum distance of 345mm and a
maximum of 550mm between studs.
Check to make sure ceiling and roof structure will
not obstruct flue.
*Twin skin flue NOT supplied by Rinnai.
CUT OPENING IN WALL
Wall box measures 330mm X 100mm, but opening
required is 335mm X 160 mm. This is to allow for
ventilation around the wall box.
Failure to cut the correct sized hole may lead to
excessively high wall temperatures.
GAS SUPPLY POSITION
The gas supply should be run before installing the
heater.
The easiest way is to run the supply, leaving the end
of the copper flare as shown in the diagram, then
attach the elbow/union to the copper supply.
Refer to A.G.A. pipe sizing chart if in doubt about
size of supply pipe.
CUT AWAY TOP PLATE AND ANY
NOGGINS BETWEEN STUDS
Fit housing into prepared opening
Tabs should be fitted tightly against the plaster
board. Drill through flanges at stud centres and
fix to wall with 4 screws. The housing must be
secured to the studs so as to allow the outlet to
protrude back into the cavity, giving the twin skin
flue a minimum clearance from the plaster board of
10mm, excluding spacers.
Rinnai 22 REH281 - SPECTRUM 28 OIM