W415-1013 / C / 11.19.13
13
EN
RIGHT HAND RA
4.6 MOUNTING PRIMARY AIR CONTROL
LEFT HAND RA
Location of the Primary Air Control in left and right RA.
IMPORTANT
:
This step must follow the plenum installation in Section 6.0. The plenum is not shown in diagrams below, for
clarity purposes.
1. Attach Vertical Guide Bracket (VGB) to the Top of the rear air supply chamber.
a. Centre the VGB around the control rod opening as per diagram and position the two vertical
fi
ngers of
the VGB so the bend in these
fi
ngers are
fl
ush with the back side of the shutter plate.
b. Locate VGB on screws inserted in the predrilled holes of the rear air supply chamber, as per diagrams.
DO NOT TIGHTEN SCREWS SO BRACKET CAN BE ADJUSTED.
c. With shutter plate pushed towards the front of the furnace in the air damper assembly slot, and the base
of the VGB held
fi
rmly down on the top of the air supply chamber, position the bend in the vertical
fi
ngers
so there is a 0” to 1/32” gap between the back of the shutter plate and the bend in the vertical
fi
ngers.
FLUSH TO
SHUTTER PLATE
HOLD SHUTTER
PLATE FORWARD
TOWARDS FRONT
OF FURNACE
SHUT
TER
PLA
TE
CONTROL
ROD
OPENING
REAR AIR
SUPPL
Y
CHAMBER
VGB
H3.37
THE FINGERS MUST NOT EXERT ANY FORWARD FORCE ON THE SHUTTER PLATE WITH THE
MOUNTING SCREWS TIGHTENED. THE SHUTTER PLATE MUST SLIDE UP AND DOWN FREELY IN
THE SLOT, AND SHOULD READILY FALL (GRAVITY ONLY) INTO THE SLOT IF RAISED BY HAND
2” (51mm)
AND RELEASED. IF ANY TENSION EXISTS BETWEEN VGB AND SHUTTER PLATE, THE
FRICTION MAY PREVENT THE SHUTTER PLATE FROM FALLING, CAUSING THE FURNACE TO
OVER FIRE.
