Blower Heat Off Delay Timings; Normal Sequence Of Operation; Power Up; Heating Mode - Goodman GMV95 Installation Instructions Manual

• Profile D ramps up to 50% of the demand for 1/2 minute,
then ramps to 82% 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.
82% CFM
OFF 50% CFM
1/2 min
7 1/2 min
Cooling Demand
6. Select the heating speed from the heating speed chart in
the Specification Sheet 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 GMV95704BXA 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 Minus".
"A Minus" has a rise of 56°F for both stages
which is within the 30-60°F rise range for the
GMV95704BXA.
electrical consumption to a minimum. Set the
"Heat" speed DIP switches to "A".
Heating Speed Tap
A
B*
C
D
(* indicates factory setting)
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 selection. Turn on
power to furnace. Verify selected CFM by counting the green
CFM LED blinks.
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.
able allow the blower performance to be optimized for the particu-
lar homeowner's needs.
B H O D
LOWER EAT FF ELAY
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 delay times.
*NOTE: Please contact your distributor or our website for the applicable Specification Sheet referred to in this manual.
100% CFM 50% CFM
1/2 min
This setting will keep
DIP Switch No.
7 8
OFF OFF
ON OFF
OFF ON
ON ON
The speeds avail-
T
IMINGS
ON
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
(* indicates factory setting)
Heat Off Delay Switches
XV. NORMAL SEQUENCE OF OPERATION
P U
OWER P
The normal power up sequence is as follows:
•
115 VAC power applied to furnace.
•
Integrated control module performs internal checks.
•
Integrated control module flashes LED one time.
•
Integrated control module monitors safety circuits
continuously.
•
Furnace awaits call from thermostat.
H M
EATING ODE
The normal operational sequence in heating mode is as follows:
•
R and W1 (or R and W1/W2) thermostat contacts close,
initiating a call for heat.
•
Integrated control module performs safety circuit checks.
•
Induced draft blower is energized on high speed for a 15-
second prepurge. Humidifier terminals are energized with
induced draft blower.
•
Induced draft blower steps to low speed following prepurge.
Low stage pressure switch contacts are closed.
•
Igniter warm up begins upon step to low speed and
presence of closed low stage pressure switch contacts.
•
Gas valve opens at end of igniter warm up period, delivering
gas to burners and establishing flame.
•
Integrated control module monitors flame presence. Gas
valve will remain open only if flame is detected.
•
If the thermostat call is for low heat, gas valve and induced
draft blower will continue on low stage. If the call is for high
heat, the gas valve and induced draft blower will change to
high stage.
•
Circulator blower is energized on heat speed following a
fixed thirty second blower on delay. The circulator blower
requires thirty (30) seconds to ramp up to full speed.
Electronic air cleaner terminals are energized with circulator
blower.
•
Furnace is now operating on the specified stage called for
by the two-stage thermostat.
32
Heat Off
3
Delay
2
90 Seconds
1
3
Heat Off
Delay
2
120 Seconds
1
*
3
Heat Off
Delay
2
150 Seconds
1
3
Heat Off
Delay
2
180 Seconds
1
Heat Off Delay