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DESCRIPTION AND USAGE
Use this Condensing Heat Exchanger kit to replace a failed
condensing heat exchanger. This Condensing Heat Exchanger Kit
contains the following items. See Table 1 for kit contents and Table
2 for where used.
Table 1 – Kit Contents
Kit No. 336774---752, ---758, ---762, ---772
Description
HX & Panel Assy.
Containment Plate
Screw
Gasket
Coll. Box Gasket
Screw
Instructions
Kit No. 336774---753, ---754, ---755, ---763, ---764, ---765, ---773,
---774, ---775, ---776
Description
HX & Panel Assy.
Containment Plate
Screw
Gasket
Coll. Box Gasket
Screw
Instructions
Kit No. 336774---756, ---766, ---767, 769, ---777
Description
HX & Panel Assy.
Containment Plate
Screw
Gasket
Coll. Box Gasket
Screw
Instructions
Kit No. 336774---757, ---759, ---768, ---770, ---778
Description
HX & Panel Assy.
Containment Plate
Screw
Gasket
Coll. Box Gasket
Screw
Instructions
Table 2 – Where Used
KIT NUMBER
SERIES
336774--- 752--- CBP
A
336774--- 753--- CBP
A
A
336774--- 754--- CBP
A
336774--- 755--- CBP
A
A
336774--- 756--- CBP
A
336774--- 757--- CBP
A
336774--- 758--- CBP
A
336774--- 759--- CBP
A
336774--- 769--- CBP
A
336774--- 770--- CBP
A
B
336774--- 762--- CBP
B
336774--- 763--- CBP
B
336774--- 764--- CBP
B
336774--- 765--- CBP
B
336774--- 766--- CBP
B
336774--- 767--- CBP
B
336774--- 768--- CBP
B
Quantity
1
1
43
2
1
8
1
Quantity
1
1
49
2
1
10
1
Quantity
1
1
51
2
1
12
1
Quantity
1
1
59
2
1
12
1
CASING
INPUT
WIDTH --- IN
BTUH
(MM)
40,000
14 3/16 (360)
40,000
17 1/2 (445)
60,000
17 1/2 (445)
80,000
80,000
21 (533)
60,600
21 (533)
100,000
120,000
24 1/2 (622)
60,000
14 3/16 (360)
140,000
24 1/2 (622)
100,000
21 (533)
120,000
24 1/2 (622)
140,000
40,000
24 1/2 (622)
60,000
40,000
17 1/2 (445)
60,000
17 1/2 (445)
80,000
17 1/2 (445)
80,000
21 (533)
100,000
21 (533)
120,000
24 1/2 (622)
Table 2 - - Where Used (Con't.)
KIT NUMBER
SERIES
336774--- 772--- CBP
336774--- 773--- CBP
336774--- 774--- CBP
336774--- 775--- CBP
336774--- 776--- CBP
336774--- 777--- CBP
336774--- 778--- CBP
INSTALLATION
Unit Shut Down
1. Set room thermostat to lowest setting or "OFF."
2. Disconnect power at external disconnect, fuse or circuit
breaker.
3. Turn off gas at external shut- -off or gas meter.
4. Remove outer doors and set aside.
5. Turn electric switch on gas valve to OFF.
Vent Pipe Removal
NOTE: It will be necessary to remove the vent pipe from the
furnace in order to remove the heat exchanger.
1. Support the vent pipe as close to the furnace as possible to
prevent damage to the vent system.
2. Cut vent pipe with a hacksaw and move the remaining vent
pipe out of the way. Secure the vent pipe if necessary.
3. Loosen both clamps at the vent pipe support attached to fur-
nace casing.
4. Loosen clamp for the vent pipe at vent elbow on the inducer
assembly.
5. Remove remaining vent pipe through the top of the furnace
casing and set aside.
Manifold Removal / Burner Box Removal
NOTE: Use a back- -up wrench on the gas valve to prevent the
valve from rotating on the manifold or damaging the mounting to
the burner box. See Fig. 3.
1. Disconnect the gas pipe from gas valve and remove pipe
from the furnace casing.
2. Disconnect the connector harness from gas valve (Modulat-
ing only) or remove individual wires from terminals on gas
valve (All other models).
3. Disconnect the wires from gas valve, flame sensor and hot
surface igniter.
4. Remove wires from both rollout switches.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper furnace
operation or failure of furnace.
Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation.
5. Support the manifold and remove the 4 screws that secure
the manifold assembly to the burner box and set aside.
Note the location of the green and yellow ground wire for
reassembly later.
6. Support the burner box assembly and remove the screws
that attach the burner box to the heat exchanger cell panel.
7. Set the burner box assembly aside.
2
CASING
INPUT
WIDTH --- IN
BTUH
(MM)
C
26,000
14--- 3/16
C
40,000
(360)
C
60,000
C
40,000
C
60,000
17 1/2 (445)
C
80,000
C
80,000
21 (533)
C
100,000
C
120,000
24--- 1/2 (622)
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