SERVICE AND TECHNICAL SUPPORT MANUAL
Gas Furnace: (F/G)9MAC
Specifications subject to change without notice.
440 04 4201 03
11
Table 3
Airflow Switch Table
O
O
O
O
O
O
O
O
O
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
060-14
080-14
060-20
080-20
100-22
120-22
O
O
O
O
O
O
O
O
O
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
060-14
080-14
060-20
080-20
100-22
120-22
O
O
O
O
O
O
O
O
O
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
060-14
080-14
060-20
080-20
100-22
120-22
O
O
O
O
O
O
O
O
O
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
3
2
1 N
060-14
080-14
060-20
080-20
100-22
120-22
1860
1860
1116
1116
976
976
1200
1200
1860
2100
1488
1860
2100
930
744
930
1116
1302
1488
744
744
930
1116
1302
1860
744
744
930
1116
1302
1488
1860
1860
1860
744
744
930
1116
1302
1488
1860
1860
1302
1302
1302
558
558
744
930
1116
1302
558
558
744
930
1116
1302
1302
1627
1953
NOMINAL AIRFLOW BASED ON 370 CFM/TON (SW1-5 = ON, SW4-3 = ON)
Model Size
SW2 Clg Default SW3 CF Default
COOLING (SW2) AND CONTINUOUS FAN (SW3) AIRFLOW: SET-UP SWITCH POSITIONS
1302
1627
1953
1627
814
651
814
976
1139
1302
1627
651
651
814
976
1139
1627
651
651
814
976
1139
1302
1627
1627
1627
651
651
814
976
1139
1302
1627
1627
1139
1139
1139
488
488
651
814
976
1139
488
488
651
814
976
1139
1139
2000
2100
NOMINAL AIRFLOW BASED ON 325 CFM/TON (SW1-5 = OFF, SW4-3 = ON)
Model Size
SW2 Clg Default SW3 CF Default
COOLING (SW2) AND CONTINUOUS FAN (SW3) AIRFLOW: SET-UP SWITCH POSITIONS
1600
2000
2100
2000
1000
800
1000
1200
1400
1600
2000
800
800
1000
1200
1400
2000
800
800
1000
1200
1400
1600
2000
2000
2000
800
800
1000
1200
1400
1600
2000
2000
1400
1400
1400
600
600
800
1000
1200
1400
600
600
800
1000
1200
1400
1400
1400
1750
2100
NOMINAL AIRFLOW BASED ON 400 CFM/TON (SW1-5 = ON, SW4-3 = OFF)
Model Size
SW2 Clg Default SW3 CF Default
COOLING (SW2) AND CONTINUOUS FAN (SW3) AIRFLOW: SET-UP SWITCH POSITIONS
1750
875
700
875
1050
1225
1750
700
700
875
1050
1225
1400
1750
2100
1750
700
700
875
1050
1225
1400
1750
1750
1750
700
700
875
1050
1225
1400
1750
1750
1050
525
525
700
875
1050
1225
1225
1225
NOMINAL AIRFLOW BASED ON 350 CFM/TON (Factory Default - SW1-5 = OFF, SW4-3 = OFF)
Model Size
SW2 Clg Default SW3 CF Default
COOLING (SW2) AND CONTINUOUS FAN (SW3) AIRFLOW: SET-UP SWITCH POSITIONS
1050
525
525
700
875
1050
1225
1225
1225
L11F092
Adjust Thermostat Heat Anticipator
a. Mechanical thermostat. Set thermostat heat
anticipator to match the amp. draw of the electrical
components in the R
−
W/W1 circuit. Accurate amp.
draw readings can be obtained at the wires normally
connected to thermostat subbase terminals, R and W.
The thermostat anticipator should NOT be in the
circuit while measuring current.
(1.) Set SW1
−
2 switch on furnace control board to
ON.
(2.) Remove thermostat from subbase or from wall.
(3.) Connect an amp. meter as shown in
across the R and W subbase terminals or R and
W wires at wall.
(4.) Record amp. draw across terminals when
furnace is in minimum heat and after blower
starts.
(5.) Set heat anticipator on thermostat per thermostat
instructions and install on subbase or wall.
(6.) Turn SW1
−
2 switch OFF.
(7.) Install blower door.
b. Electronic thermostat: Set cycle rate for three cycles
per hr.
