The pyrolysis of wood produces certain substances which will not burn unless the temperature in the firebox reaches 1000°F or higher. Under normal conditions these temperatures are not attained and these sub- stances simply escape up the chimney as wasted energy and can form deposits in the chimney. By forcing these unburned substances to come into contact with a cata- lyst, we can cause them to burn at much lower tempera- tures that are easily attainable during normal operation.
Installation and removal of the combustor is simple, the element fits inside a retainer. The retainer fits inside the furnace exhaust pipe which extends down into the fire- box. The assembled combustor slides up into the ex- haust pipe stub which protrudes down into the firebox. There are three rods on the retainer which engage slots in the pipe and then turn slightly to lock in place. These rods are not symmetrical. Two rods are welded together to form a 90° angle. This angle points toward the rear of the firebox.
SLOTS IN EXHAUST PIPE
CATALYTIC ELEMENT
RODS ON RETAINER
FIGURE 18 INSTALL OPTIONAL CATALYTIC COMBUSTOR (MODEL 2900/4000)
1/4 LOCKNUT
DO NOT REMOVE
KNOCKOUT
MANUAL DRAFT
CONTROL
FIGURE 19 INSTALL MANUAL DRAFT-MODEL 526
INSTALL COMFORT CONTROL CENTER AND FORCED DRAFT BLOWER
1.Install all knobs to control levers and door handles. See figure 20.
2.The comfort control center is factory wired to the fan/limit control and the forced draft blower. It has a prewired flexible conduit for connection to the circulating blower.
3.If you have optional temperature gauge on your con- trol, then strip ½" of insulation from the two leads of ther- mocouple wire protruding through the rectangular opening on the furnace side. Connect these leads to the terminals on the temperature gauge of the control. IM- PORTANT: Remove the wire ground clip from the termi- nals of the gauge and connect White wire to + terminal and Red wire to - terminal. See figure 22.
4.Mount the control to the side of the furnace with four #10 sheet metal screws.
ASSEMBLE MANUAL DRAFT
MODEL 526 ONLY
Using a
5.Remove the knockout section of the draft channel on model 526 by striking sharply with a hammer. Be careful so you do not damage the mechanism inside the chan- nel and directly behind the
6.Align the forced draft blower outlet flange over the knockout and secure with three #10 sheet metal screws.
7.Secure conduit to furnace side using conduit clamps and #10 sheet metal screws.
23