![background image](http://html1.mh-extra.com/html/carrier/kgatw0601hsi/kgatw0601hsi_installation-instructions-manual_2563046025.webp)
d. Remove bottom closure panel and discard.
e. Reinstall front filler panel.
3. Apply 2 factory-supplied foam strips to mating side of each furnace. Locate strips equal distance from top and bottom as shown in Fig. 23.
4. Return air connections
a. For upflow applications:
Bottom return air usage is required as part of any upflow return air configuration. If additional return air is to enter 1 side of each furnace,
in addition to bottom return air, cut open 1 entire return-air opening in appropriate side of each furnace. (See Fig. 1.)
WARNING: UNIT DAMAGE AND FIRE HAZARD
Failure to follow this warning could result in unit damager, fire, personal injury or death.
DO NOT use the back of the furnace for return-air duct connections as limit cycling will occur.
b. For downflow applications:
Return air can only be connected to bottom opening of furnace. A common return air plenum is required for proper auxiliary limit switch
operation. (See Fig. 2.)
5. For upflow applications
a. Position furnaces against each other on return-air plenum. Adjust and shim each furnace to align unused condensate drain line holes in
lower section of both furnaces holes, which will be used for wire routing between furnaces. (See Fig. 29.)
b. Drill two 1/8-in. holes, approximately 1 in. below discharge air flange, from inside top of discharge opening and through both furnaces.
(See Fig. 24.)
c. Drive 1 factory-supplied No. 6 X 3/4-in. LG screw through each hole and tighten until furnaces are secure and foam strips have sealed
gap between furnaces.
Fig. 20—Dimensional Drawing for Twinned Single-Speed Condensing Furnaces (Upflow, Downflow)
A93537
17
5
/
16
″
24
1
/
2
″
27
1
/
2
″
TYP
27
5
/
8
″
29
5
/
8
″
TYP
30
13
/
16
″
TYP
32
5
/
8
″
TYP
33
1
/
4
″
TYP
CONDENSATE DRAIN
TRAP LOCATION
7
/
8
-IN. DIA
ACCESSORY
POWER ENTRY
7
/
8
-IN. DIA
POWER CONN
26
15
/
16
″
24
1
/
2
″
22
1
/
4
″
2-IN. COMBUSTION-
AIR CONN
1
/
2
-IN. GAS CONN
2-IN. VENT CONN
1
/
2
-IN. DIA THERMOSTAT
ENTRY
22
11
/
16
″
SIDE INLET
23
1
/
4
″
1
1
/
4
″
1
"
E
INLET
11
/
16
″
E
INLET
11
/
16
″
F
13
/
16
″
13
/
16
″
OUTLET
A
AIRFLOW
OUTLET
26
15
/
16
″
28
1
/
2
″
26
1
/
4
″
22
13
/
16
″
19
″
13
/
16
″
5
/
8
″
39
7
/
8
″
11
/
16
″
24
3
/
16
″
BOTTOM INLET
18
1
/
4
″
22
11
/
16
″
2-IN. COMBUSTION-
AIR CONN
1
/
2
-IN. GAS CONN
7
/
8
-IN. DIA
POWER CONN
1
/
2
-IN. DIA
THERMOSTAT ENTRY
2-IN. VENT CONN
14
1
/
2
″
SIDE INLET
OUTLET
AIRFLOW
D
D
9
3
/
8
″
TYP
26
15
/
16
″
TYP
SIDE INLET
CONDENSATE
DRAIN LOCATION
(USED FOR LH FURNACES AFTER
SERIAL NO. 2894A00001)
30
1
/
2
″
CONDENSATE
DRAIN LOCATION
(USED FOR RH FURNACES AFTER
SERIAL NO. 2894A00001)
CONDENSATE DRAIN
TRAP LOCATION
(USED FOR RH FURNACES BEFORE
SERIAL NO. 2894A00001)
(USED FOR LH FURNACES
BEFORE SERIAL NO.
2894A00001)
26
1
/
4
TYP
→
Table 3—58MCA, 58MCB, 58MSA, 58MTB, 58MXA, 58MXB, 58MTA, 340AAV, 340MAV, 345MAV, 350AAV, 350MAV, 352AAV,
352MAV, 490AAV, PG9MAA and PG9MAB Single-Speed Condensing Furnace Dimensions (In.)
INPUT HEATING SIZE
(BTUH)
NOMINAL COOLING SIZE
A
D
E
F
60,000
48,000
35
15-7/8
16
33-3/8
80,000*
48,000
35
15-7/8
16
33-3/8
80,000
60,000
42
19-3/8
19-1/2
40-3/8
100,000*
48,000
42
19-3/8
19-1/2
40-3/8
100,000*
60,000
42
19-3/8
19-1/2
40-3/8
120,000*
60,000
49
22-7/8
23
47-3/8
* Two speed furnace capacities and dimensions
—25—