Goodman ACS series Service Instructions Manual page 68

PRODUCT DESIGN
6. Select the heating speed from the heating speed chart
in the Product Data Book applicable to your model for
your model. The adjust setting (already established by
the cooling speed selection) determines which set of
speeds are available. The selected speed must provide
a temperature rise within the rise range listed with the
particular model.
Example: The *MV90704CXA is set for 990 CFM on
cooling, the "ADJUST" is set to "-" (minus).
The four heating speeds available are "A
Minus", "B Minus", "C Minus", and "D Mi-
nus". "A Minus" has a rise of 56°F for both
stages which is within the 30-60°F rise
range for the *MV90704CXA. This setting
will keep electrical consumption to a mini-
mum. Set the "Heat" speed DIP switches
to "A".
7. Select the desired "heating" speed tap by positioning
switches 7 and 8 appropriately. Refer to figure above.
Turn off power to furnace for a minimum of 10 seconds,
allowing motor to reset and recognize new speed selec-
tion. Turn on power to furnace. Verify selected CFM by
counting the green CFM LED blinks.
In general lower heating speeds will: reduce electrical con-
sumption, lower operating sound levels of the blower, and
increase the outlet air temperature delivered to the home.
The speeds available allow the blower performance to be
optimized for the particular homeowner's needs.
CIRCULATOR BLOWER TIMINGS
80% & 90% Furnaces
NOTE: Items in this section refer to the air circulator blower
fan, NOT to the induced draft blower. The induced draft blower
timing sequence is not adjustable. The circulator blower
fan timing is adjustable only on models with optional
"heating fan OFF delay" adjustment pins or switches.
It is NOT adjustable in any other circumstances.
As shipped, the circulator blower fan will remain on for 150
seconds after the gas valve closes. When a call for cooling
occurs, the circulator fan comes on and remains on for 45
seconds after the call for cooling ends. During normal heating
operation, the circulator fan will come on approximately 30
seconds after the gas valve opens.
Blower Heat Off Delay Timings
The integrated control module provides a selectable heat off
delay function. The heat off delay period may be set to 90,
120, 150, 180 seconds using the DIP switches or jumper
provided on the control module. The delay is factory shipped
at 150 seconds but may be changed to suit the installation
requirements and/or homeowner preference. Refer to the
following figures for switch positions and corresponding de-
lay times.
68
90
SECOND
DELAY
150
SECOND
DELAY
Single-Stage 80% and 90% Settings
3
ON
2
ON 1
3
ON
2
OFF 1
3
OFF
2
ON 1
3
OFF
2
OFF 1
Heat Off Delay
(* indicates factory setting)
Two-Stage Variable Speed
80% and 90% Settings
120
SECOND
DELAY
180
SECOND
DELAY
Heat Off
Delay
90 Seconds
Heat Off
Delay
120 Seconds
*
Heat Off
Delay
150 Seconds
Heat Off
Delay
180 Seconds