Operating instructions

19
Installation
installation using a Block-oFF plate For usa onlY:
If this unit is to be installed into a masonry replace or a zero-clearance replace with a direct connection
you must install a non-combustible seal-off device such as a block-off plate or damper adapter. By
installing a block-off plate you seal the chimney, ensuring that no smoke enters the home and sealing the
chimney to encourage draft. To construct a block-off plate follow the below steps.
Before starting this type of installation refer to instaLLation - Masonry firePLace instaLLation - insert for
additional information. For clearances refer to sPecifications - cLearances to coMbustibLes - 1200-c insert
A
B
C
D
Front of fireplace opening.
A
B
C
and sPecifications - cLearances to coMbustibLes - 1700-c insert.
See Figure 19 and 20 for examples of a masonry replace and a
zero-clearance replace with a direct connection.
1. Determine where the block-off plate will be installed; above
the top of the rebox (it must be high enough to easily install
the connection pipe) but below the damper area. Look for a
location that is level and in an area where the plate can be
mounted easily.
The measurement that will be needed are as followed (refer
to Figure 17 and 18):
A - The width at the front of the rebox at the height where
the block-off plate will be installed.
B - The width at the back of the rebox at the height where
the block-off plate will be installed.
C - Then depth of the block-off needed (the distance
between A and B).
D - The distance of the center of the ue to the front of the
replace opening. Refer to Step 3.
NOTE: In general masonry replaces have square reboxes
while zero-clearance (metal) replaces have domed rebox
tops. Therefore zero-clearance block-off plates may be more
difcult to install. Insulation may be used around the edges
to simplify sealing the plate.
2. Create a cardboard template of the dimensions with 2” (51
cm) wide anges on each side. These anges will be used to
mount the block-off plate to the inside of the rebox. Bend
the anges downwards on the template and place it inside
the replace. Continue on if the template ts correctly in
its planned location. If the template does not t, make a
new template with the required corrections until it does t
correctly.
3. With the template in place, mark the location for the center
of the ue pipe when the unit is in place. If installing a
1200-C the distance will be approximately 8¼” or 9
15
/16”
back from the replace opening. If installing a 1700-C the
distance will be approximately 12¾” or 14
7
/16” back from
the replace opening. Remove the template and cut a 6¼”
diameter hole centered on this mark.
Figure 17: 3D of Dimensions needed from
the Fireplace.
Figure 18: Layout of the Block-Off Plate.