Goodman AMH8 Service Instructions Manual page 38

PRODUCT DESIGN
TwinComfort™ Configuration & Operation
38
TwinComfort™
This furnace is capable of the following heating modes:
• Single Stage (Factory Setting)
• Modified Two-Stage
> Fixed 5-Min. Low Stage
> Auto Time (1-12 Min.) Low Stage
To change from the factor single-stage operation, adjust the
dipswitches on the ignition control as follows:
HEAT OFF
SECOND
DELAY
DELAY
MODE 2-STAGE
SECOND
STAGE
ONLY
*
Switches for White-Rodgers board shown above
With other venders, order of switches may vary
but functionality stays the same.
Note: This furnace is designed to be used
with a single-stage thermostat.
Start
Call for Heat
Safety Circuit Check
Start Furnace
in Low Stage
Low-Heat Blower
Delay Time (5 Min)
Gas Valve Switch
to 2nd Stage
Blower Switch to
Hi Heat Operation
T-Stat Satisfied
SECOND
DELAY
1-STAGE
AUTO
Start
Call for Heat
Safety Circuit Check
Start Furnace
in Low Stage
Low-Heat Blower
Delay Time (1-12 Min)
Gas Valve Switch
to 2nd Stage
Blower Switch to
Hi Heat Operation
T-Stat Satisfied