Carrier 320720---751 THRU ---761 User Manual
2
Table 1 – Kit Usage
UNIT
KIT PART
NO.
340AAV
340MAV
350AAV
350MAV
353AAV
490AAV
345MAV
351DAS
352AAV
352MAV
353BAV
PG9MXA
355MAV
355AAV
355BAV
355CAV
PG9UAA
58MCA
58MCB
58MEB
58MXA
58MXB
58MSA
58MEC
58MTA
58MTB
58MVB
58UVB
58MVC
58MVP
PG9MAA
PG9MAB
320720--- 751
24040
36040
24040
36040
--- ---
--- ---
--- ---
--- ---
040--- 08
040--- 12
040--- 08
040--- 12
--- ---
--- ---
--- ---
24040
36040
320720--- 753
24060
36060
48060
24060
36060
48060
--- ---
36060
42060
42060
060--- 08
060--- 12
060--- 16
060--- 08
060--- 12
060--- 16
060--- 12
060--- 14
060--- 14
24060
36060
48060
320720--- 754
Prior to S/N
3002A14578
36080
48080
36080
48080
36080
48080
36080
48080
--- ---
--- ---
080--- 12
080--- 16
080--- 12
080--- 16
080--- 12
080--- 16
--- ---
--- ---
36080
48080
320720--- 755
--- ---
--- ---
--- ---
--- ---
42080
(Series A)
--- ---
--- ---
--- ---
--- ---
--- ---
080--- 14
(Series
100)
--- ---
320720--- 756
48100
60100
48100
60100
--- ---
48100
60100
60100
60100
100--- 16
100--- 20
100--- 16
100--- 20
100--- 16
100--- 20
100--- 20
100--- 20
48100
60100
320720--- 757
60120
60140
60120
--- ---
60120
60120
60120
120--- 20
140--- 20
120--- 20
120--- 20
120--- 20
120--- 20
60120
60140
320720--- 758
--- ---
--- ---
--- ---
--- ---
42040
42040
--- ---
--- ---
--- ---
040--- 14
040--- 14
--- ---
320720--- 760
60080
60080
60080
--- ---
42080
(Series B
and later)
60080
42080
60080
080--- 20
080--- 20
--- ---
080--- 14
080--- 20
080--- 14
(Series
110 and
later)
080--- 20
60080
320720--- 761
After S/N
3002A14577
36080
48080
36080
48080
36080
48080
36080
48080
--- ---
--- ---
080--- 12
080--- 16
080--- 12
080--- 16
080--- 12
080--- 16
--- ---
--- ---
36080
48080
INSTALLATION
Remove Whole Cell Panel Assembly
See Fig. 1 and Fig. 2 for furnace component locations. See Fig. 3
See Fig. 1 and Fig. 2 for furnace component locations. See Fig. 3
for expanded view of heating system components.
NOTE: Actual component locations may vary depending on
model and series.
NOTE: Actual component locations may vary depending on
model and series.
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Remove blower access panel.
4. Disconnect field power supply wires from J--box.
5. Remove two screws securing J--box.
6. Remove two screws securing top filler panel and rotate
2. Remove main furnace door.
3. Remove blower access panel.
4. Disconnect field power supply wires from J--box.
5. Remove two screws securing J--box.
6. Remove two screws securing top filler panel and rotate
panel upwards to remove or allow the heat exchanger to
be removed from front of furnace.
7. Disconnect combustion--air intake pipe from intake hous-
ing and move pipe out of furnace casing.
8. Disconnect gas supply pipe from gas valve using backup
wrench.
9. Disconnect vent pipe from inducer housing by loosening
coupling clamp on inducer outlet. If coupling has 2
clamps, loosen clamp on vent pipe side. Move pipe out of
furnace casing.
furnace casing.
10. If control center is located in burner compartment of fur-
nace, remove blower motor leads, transformer wires, door
switch wires, and auxiliary limit switch wires (if present)
switch wires, and auxiliary limit switch wires (if present)
from control center and pull wires through blower shelf.
11. If control center is located in blower compartment of fur-
nace, disconnect wires from flame sensor, hot surface ig-
niter, overtemperature switch, gas valve, pressure
switch(es), inducer motor, limit switch, and J--box, then
switch(es), inducer motor, limit switch, and J--box, then
pull wires through blower shelf.
12. Remove two screws securing blower to blower shelf (four
screws on 120 and 140 sizes).
13. Remove two screws next to blower mounting screws that
secure blower shelf to cell panel.
14. Remove three screws from each side of cell panel.
15. If control center is located in burner compartment of fur-
15. If control center is located in burner compartment of fur-
nace, remove control center by removing screw and press-
ing tabs inward.
ing tabs inward.
16. If control center was removed from furnace casing, secure
control center (and J--box) to manifold for removal pur-
poses only.
17. Disconnect field drain connection from condensate trap.
18. Disconnect drain and relief port tube from condensate trap.
19. Remove condensate trap from furnace casing or blower
18. Disconnect drain and relief port tube from condensate trap.
19. Remove condensate trap from furnace casing or blower
shelf.
20. Remove whole cell panel assembly with heat exchanger,
burner box, inducer assembly, J--box (if applicable), and
control center (if applicable) attached through front of fur-
control center (if applicable) attached through front of fur-
nace.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Whole cell panel assembly is heavy. Get help to remove and
Failure to follow this caution may result in personal injury.
Whole cell panel assembly is heavy. Get help to remove and
lift assembly.
CAUTION
!
Remove Burner Box Assembly
1. If not previously disconnected, disconnect wires or con-
nectors to overtemperature switch, gas valve, igniter, and
flame sensor.
flame sensor.
2. Remove pressure switch tube from intake housing.
3. Remove two screws attaching intake housing to burner
3. Remove two screws attaching intake housing to burner
box, and rotate intake housing away from burner box for
removal.
4. Disconnect pressure tubing from gas valve.
5. Remove screws attaching burner box to cell panel.
5. Remove screws attaching burner box to cell panel.
NOTE: Burner box cover, manifold, gas valve, and burner
assembly should be removed as one assembly.
assembly should be removed as one assembly.
320720