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710150 08/00
Figure 42. Gas Atmospheric Furnace, A/C Ready, M1G (B, C, D) 056, 070 Models
RED (LOW)
BLACK (HIGH)
BLUE (MED. HI)
ORANGE (MED. LO)
152
A/C
BLOWER
RELAY
364
ON/OFF
SWITCH
GAS VALVE
FAN
SWITCH
HI-LIMIT
AUX. LIMIT
TRANSFORMER
L1 N
CR
24 V
115 V
BLACK
ORANGE
BLUE
ORANGE
GREEN
WHITE
WHITE
WHITE
BLACK
GRAY
BLUE
BLUE
BLACK
VENT SWITCH
BLUE
FURNACE ELECTRICAL BOX
L1
NEUTRAL
GROUND SCREW
C
R
G
W
HEATING/COOLING
RED
RED
(SEE NOTE)
TIE WIRE
CONNECTOR
HOUSING CAP
BLUE
GRAY
3A FUSE
GRAY
RED
654321
WHITE
SUPPLIED
BY INSTALLER
LEGENDS
115V: FIELD 115V:
24V: FIELD 24V:
NOTES
1. Incoming power must be polarized. Observe color
coding. (See furnace data label for electrical
information.)
2. If any of the original wires (as supplied with the
appliance) must be replaced, use 105˚C
Thermoplastic type wire or its equivalent.
BLOWER
MOTOR
4 SPEED
BLACK
BLACK
GRAY
GREEN
WHITE
MANUAL RESET
*
*M1G(C,D) Heating - replace orange wire with red wire (low speed)
M1GB 070 Heating - replace orange wire with blue
A/C & Heating Speeds: Refer to Table 10, A/C Blower Selection in the manual
NOTE: To run at same speed in both heating and cooling mode,
remove wire from either terminal 4 or 6 on the relay, then attach
jumper to terminals 4 and 6.
HEATING/
COOLING
654321
RED (LOW)
BLACK (HIGH)
BLUE (MED. HI)
WHITE
3 SPEED
BLOWER
MOTOR