INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
440 01 4001 05
31
Specifications subject to change without notice.
Heating and Cooling Application Two
−
Stage Wiring Diagram with Single
−
Stage Thermostat
A11401
115
ï
VOLT FIELD
ï
SUPPLIED
FUSED
DISCONNECT
JUNCTION
BOX
24
ï
VOLT
TERMINAL
BLOCK
THREE
ï
WIRE
HEATING
ï
ONLY
FIVE
WIRE
NOTE 2
NOTE 1
1
ï
STAGE
THERMOSTAT
TERMINALS
FIELD
ï
SUPPLIED
FUSED DISCONNECT
CONDENSING
UNIT
FURNACE
COM
R
W
GND
GND
FIELD 24
ï
VOLT WIRING
FIELD 115
ï
, 208/230
ï
, 460
ï
VOLT WIRING
FACTORY 24
ï
VOLT WIRING
FACTORY 115
ï
VOLT WIRING
Connect Y/Y2
ï
terminal as shown for proper operation.
Some thermostats require a ”C” terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
208/230
ï
OR
460
ï
VOLT
THREE
PHASE
208/230
ï
VOLT
SINGLE
PHASE
WHT
BLK
WHT
BLK
W/W1
W2
Y/Y2
G
NOTES:
1.
2.
3.
BLOWER
DOOR
SWITCH
C
O
N
T
R
O
L
C
Y
R
G
J
−
Box Installation
WARNING
!
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
If field
−
supplied manual disconnect switch is to be
mounted on furnace casing side, select a location where
a drill or fastener cannot damage electrical or gas
components.
The J-Box is used when field line voltage electrical connections
are made to the furnace wiring harness inside the furnace
casing. The J-Box is not required if a field-supplied electrical
box is attached to the outside of the furnace casing and the box
is grounded to the green ground wire of the main wiring
harness and the earth ground of the field electrical supply.
The J
−
Box cover, mounting bracket and screws are shipped in
the loose parts bag included with the furnace. The J
−
Box can
be mounted on the left or right side of the casing, as viewed
from the upflow position. (See
Figure 36
)
Figure 36
Optional J
−
Box Locations
Representative drawing only, some models may vary in appearance.
L12F024
OPTIONAL
J
−
BOX
LOCATIONS