Mhsc

Lower Fire-

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ST557

Fig. 8 Remove the lower ﬁreback.

8.From inside the ﬁrebox, pull the right-hand end of the upper ﬁreback toward yourself. Carefully maneu- ver the left end of the ﬁreback assembly to let the damper rod clear its hole in the left side of the stove. Be sure to capture the spacer on the left end of the damper rod. Remove the assembly from the stove and set it on a shielded working surface.

Gasket

KT318

Fig. 9 Back view of upper ﬁreback (damper and rod re- moved).

9.Pull the damper rod out of the upper ﬁreback. Release the bolts holding the steel tabs in place, and remove the damper. Pull off the old gasket and clean off the old cement. Thoroughly clean the damper plate and around the damper opening in the upper ﬁreback. Cut a piece of the 5/16” gas- ket material to length, allowing a one inch excess. Place a continuous 1/8” bead of gasket cement in the damper gasket channel. Press the new gasket in place, trimming off the excess length. (Fig. 9) Remove any excess cement. Replace the damper, the steel tabs and bolts, and the damper rod. Close and lock the damper to seat the gasket. Use waxed paper between the damper and the upper ﬁreback to keep the cement from traveling through the gasket and sticking to the ﬁreback.

10.This is a ﬁne opportunity to inspect the catalyst. Follow the directions in the Deﬁant Owner’s Manual

on access, inspection, evaluation and replacement if needed.

11.Work in reverse order to replace parts once the gas- ket cement has dried on the upper ﬁreback assem- bly. Be sure to install the spacer on the left end of the damper rod before installing the upper ﬁreback assembly.

12.Install the upper ﬁreback assembly, left end ﬁrst; pass the damper rod through he hole in the left side of the stove, then lift the right end of the assembly into place. Loosely install all four bolts before you tighten any of them. These bolts should be snug but not tight, to allow some expansion and movement under heat.

13.Test the damper operation and the gasket’s snug- ness, as described at the start of this section. Continue after you are sure the damper operates properly.

14.Install the lower ﬁreback. Note that there are two notches in the bottom edge; these must align behind two mating nubs on the ﬁrebox ﬂoor.

15.Stand the ﬁve ﬁrebricks on end in front of the lower ﬁreback. Note that these stand behind a raised rib on the ﬁrebox ﬂoor. (Fig. 7) Join the ﬁrebricks by slipping the steel clip onto their top ends. The clip’s longer edge should go behind the ﬁrebricks, for easier installation.

16.Replace the left and right wedges. Note that their rear vertical edges bear against the outermost left and right edges of the lower ﬁreback. Gently tap the wedges downward with a rubber mallet or a ham- mer and a block of wood to cushion the impact. The wedges should be snug but not overly tight.

17.Replace the bafﬂe by placing its ends on the sup- port brackets which are part of the lower ﬁreback. The bafﬂe shields the catalytic combustor from direct ﬂame impingement and must be in place during operation.

Testing the Gasket Seals

After the cement has had several hours to dry, test the new door seal by closing and latching the door on slips of paper placed at approximately 6” intervals along the top and bottom of the door opening. Be sure to include the area where the right front door overlaps the left door. It should not be possible to slide the papers, and they should be pulled straight out only with consider- able resistance. If the paper pulls out easily, readjust the doors as needed till the doors hold the paper tightly. Do not apply this test to the glass gasketing - it is not accessible and does not get the repeated impacts that other seals receive.

149 Cleveland Drive • Paris, Kentucky 40361

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2003144

4322 specifications

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