SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVE
Specifications subject to change without notice.
440 04 4800 00 13
Figure 5 Furnace Setup Switch Description
L12F035
SETUP SWITCH SWITCH NAME NORMAL POSITION DESCRIPTION OF USE
Furnace Setup Switch Description
SW1ï1 Status Code Recovery OFF
Turn ON to retrieve up to 7 stored status codes for
troubleshooting assistance when R thermostat lead is
disconnected.
SW1ï2
Low Heat Only
(Adaptive Heat Mode when SW1ï
2 is OFF)
OFF
When SW1ï2 is O
FF allows twoïstage operation with
a single stage thermostat. Turn ON when using twoï
stage thermostat to allow Low Heat operation when R
to W/W1 closes and High Heat operation when R to
W/W1 and W2 close.
SW1ï3 Low Heat Rise Adjustment OFF
Turn ON to increase Low Heat airflow by 18 percent.
This compensates for increased return air
temperature caused with bypass humidifier. This also
increases the low heat inducer speed 15 percent.
SW1ï4 Comfort/Efficiency Adjustment ON
Turn ON to decrease low heat airflow by 7 percent,
and high heat airflow 10 percent for maximum
comfort.
SW1ï5 CFM per ton adjust OFF
Turn ON for 400 CFM per ton, Turn OFF for 350 CFM
per ton. See also SW4.
SW1ï6 Component Self Test OFF
Turn ON to initiate Component Self Test for
troubleshooting assistance when R thermostat lead is
disconnected. Turn OFF when Self Test is completed.
SW1ï7 & SW1ï8 Blower OFF delay ON or OFF
Blower Off Delay time – adjustable 90 seconds to 180
seconds. See table in Adjustments section or refer to
unit wirin
g diagram.
SW4ï3
CFM per ton Adjust
OFF
Allows additional CFM per ton selections when used
with SW 1ï5
325 CFM per ton (nominal) when SW 4ï3 ON and SW
1ï5 OFF
350 CFM per ton (nominal) when SW 4ï3 OFF and
SW 1ï5 OFF
370 CFM per ton (nominal) when SW4ï3 ON and SW
1ï5 ON
400 CFM per ton (nominal) when SW 1ï5 ON and SW
4ï3 OFF
See Air Delivery Tables for model specific CFM vs.
static pressure
AIR CONDITIONING (A/C) SETUP SWITCHES
SW 2, AC (Cooling Airflow) SETUP SWITCHES
O
N
1
1
2
The AC setup switch selects desired cooling or high stage cooling (two stage units) airflow.
See Cooling Air Delivery Tables for specific switch settings.
CONTINUOUS FAN (CF) SETUP SWITCHES
SW 3, CF (Continuous Fan) SETUP SWITCHES
The CF setup switch selects desired Continuous Fan Airflow
O
N
1
2
3
1
SW3
2
3
AC
SW2
The CF switch position is the low cooling airflow selection for two stage cooling units.
The CFM values are shown in the Air Delivery Tables below for SW 3 settings.
SW 3 cannot be set for airflow higher than SW 2.
See Continuous Fan Air Flow Table for specific switch settings.
3
CF
BASED ON 350 CFM/TON (Factory Default: SW1−5 = OFF, SW4−3 = OFF)
321
N 321N 321N 321N 321N 321N 321N 321N
040-10
060-14
080-16
080-20
100-20
120-22
CONTINUOUS FAN AND LOW COOLING AIRFLOW: SET-UP SWITCH SW3 POSITIONS
L11F097
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