Page 12 R-5086
Installation of Restrictor Plate (Figure 18)
The restrictor plate is to be used only in a completely vertical vent
installation. The restrictor plate can be used when the vertical vent rise is
between 10 feet and 25 feet.
In a vertical vent rise the rear (yellow) flame on the main burner can be
reduced due to the drawing action from the flue exhaust pipe and the air
inlet pipe. A decrease in the height or the appearance of the yellow flame
may occur when the vertical vent rise is between 10 feet and 25 feet. To
enhance the yellow flame on the main burner, the restrictor plate can be
installed beneath the vent elbow on the appliance air drop.
Please use the following steps to install the restrictor plate.
1. If attached, remove the vent pipe from the vent elbow on the appliance.
2. Remove the vent elbow from the appliance air drop by removing (4)
1/2" hex-head screws from vent elbow.
3. Align clearance holes on restrictor plate with screw holes on appliance
air drop. The gasket on the restrictor plate should be positioned
upward when the restrictor plate is placed onto appliance air drop.
4. Align clearance holes on vent elbow with clearance holes on restrictor
plate and screw holes on appliance air drop.
5. Attach vent elbow and restrictor plate to appliance air drop. Fasten (4)
1/2" hex-head screws from Step 2 through clearance holes on vent
elbow and restrictor plate and into screw holes on appliance air drop.
Attention: Apply furnace cement to the top, exterior edge on the cast
iron flue outlet.
6. Installation of restrictor plate is completed.
Attention: See Page 26 to order restrictor plate, part number CI-235.
Figure 18
Service Notes--------------------
APPLY FURNACE
CEMENT TO TOP,
EXTERIOR EDGE
ON CAST IRON
FLUE OUTLET