Goodman GMVM Service Instructions Manual page 54

OPERATION
• Profile A provides only an OFF delay of one (1) minute at
100% of the cooling demand airflow.
100% CFM
OFF
• Profile B ramps up to full cooling demand airflow by first
stepping up to 50% of the full demand for 30 seconds. The
motor then ramps to 100% of the required airflow. A one (1)
minute OFF delay at 100% of the cooling airflow is provided.
100% CFM
50% CFM
OFF
1/2 min
• Profile C ramps up to 85% of the full cooling demand air-
flow and operates there for approximately 7 1/2 minutes.
The motor then steps up to the full demand airflow. Profile C
also has a one (1) minute 100% OFF delay.
OFF
• Profile D ramps up to 50% of the demand for 1/2 minute,
then ramps to 85% of the full cooling demand airflow and
operates there for approximately 7 1/2 minutes. The motor
then steps up to the full demand airflow. Profile D has a 1/2
minute at 50% airflow OFF delay.
OFF
7. Select the heating speed for your model from the heating
speed chart in the Specification Sheet. The "adjust" setting
(already established by the cooling speed selection) deter-
mines which set of speeds are available. The selected speed
must provide a temperature rise within the rise range listed
with the particular model.
8. Select the desired "heating" speed tap by positioning switches
3 and 4 appropriately. Refer to figure above. Verify CFM by
noting the number displayed on the dual 7-segment LED
display.
In general lower heating speeds will: reduce electrical consump-
tion, lower operating sound levels of the blower, and increase the
outlet air temperature delivered to the home. The speeds avail-
able allow the blower performance to be optimized for the particu-
lar homeowner's needs.
54
100% CFM
OFF
1 min
100% CFM
OFF
1 min
100% CFM
OFF
OFF
DIP S
WITCHES
There are 18 DIP switches on the modulating furnace IFC.
Switches are located in 3 rows, each having 6 switches.
Switches are numbered from 1 to 18. The "ON" position is
"UP'. The chart shows all 18 DIP switches, their function and
their factory position.
Switches 1 & 2 Select cooling speed A, B, C or D. Factory
setting is D (both switches up in the "ON" position. These
switches are ignored when using a CTK0* communicating
thermostat.
Switches 3 & 4 Select heating speed A, B, C or D. Factory
setting is B (3 ON, 4 OFF)
when using a CTK0* communicating thermostat.
Switches 5 & 6 Select continuous fan speed A, B, C or D.
Factory setting is B (5 ON, 6 OFF) These selections are
based off of percentages of the maximum CFM that each
model furnace is rated for; A = 25%, B = 50%, C = 75%, D
= 100%. These switches are ignored when using a CTK0*
communicating thermostat.
Switches 7 & 8 Select cooling ramping profiles A, B, C or
D. Factory setting is A (both switches down in the "OFF"
position).Each ramping profile provides a different routine for
the indoor blower motor to follow in a call for cooling. Rather
than bringing the motor up to cooling speed immediately,
ramping profiles bring the motor up to cooling speed in stages.
NOTE: Reductions in CFM for ramping are not added to re-
ductions in CFM for DEHUM. Example; CFM is reduced for
the fist several minutes of a cooling call by 15%, if a call for
DEHUM is present during this CFM reduction; CFM will not
be reduced by another 15%. Rather, after the ramping time
period has expired, the CFM would continue at the 15% re-
duction to satisfy the DEHUM request. These switches are
ignored when using a CTK0* communicating thermostat .
Switches 9 & 10 Select CFM Trim Adjustment. Choices
are 0%, + 10%, -10%. Factory setting is A. Trim adjust-
ments add or subtract from the CFM selections made by
heat and cool CFM selections. Trim adjustments affect cool-
ing, and heating fan speeds. These switches are ignored when
using a CTK0* communicating thermostat .
Switches 11 & 12 Select fan off delay in heat. Choices are
90, 120, 150, or 180 seconds. Factory setting is C, 150 sec-
onds. These switches are ignored when using a CTK0* com-
municating thermostat.
Switch 13 Selects thermostat type for heating. Factory
setting for this switch is OFF, this is the correct setting for a
conventional single stage stat or a CTK02** communicating-
modulating stat. To use a conventional two stage heating
thermostat or a CTK0* thermostat, move this switch to the
ON position.
These switches are ignored