90
INTE
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D FURNACE
CONTROL
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2. For communicating systems, dipswitches are not
used. Configuration changes are made with the
thermostat.
A. Seven-Segment Display Orientation; S1-1
As the control will be applied in a multi-position fur-
nace a means of changing the orientation of the
seven segment display is provided. This dipswitch
is to be labeled S1-1. Factory setting of the S1-1
dipswitch is OFF.
S1-1 = OFF = Upflow (as-shipped) position
S1-1 = ON = Downflow position
B. Cool Blower-Off Delay; S1-2 & S1-3
A means of selecting the cooling speed blower “off”
delay time is provided. In legacy mode, dip-
switches are required to select the delay time.
These dipswitches are to be labeled S1-2 and S1-
3. The following table defines the settings:
S1-2 SW3 Selection
OFF OFF 30 seconds
Note: Factory setting = 30 seconds
ON OFF 45 seconds
OFF ON 60 seconds
ON ON 0 seconds
C. Cooling Airflow Selection; S1-4 & S1-5
S1-4 and S1-5 are to be used to select cooling air-
flow in legacy mode. The value used for each se-
lection is specified below.
HIGH COOL SELECTIONS:
½ HP Blower ¾ HP Blower
S1-4 S1-5 (42, 56 & (84, 98 &
70 KBTU) 112 KBTU
OFF OFF 1050 CFM 1750 CFM
(Factory Setting)
ON OFF 875 CFM 1400 CFM
OFF ON 700 CFM 1225 CFM
ON ON 525 CFM 1050 CFM
LOW COOL SELECTIONS:
The following model data fields are multipliers to be used
for low stage legacy cooling unless dipswitch S2-9 is in
the ON position - in which case the low cooling airflow be-
comes 50% of the high cooling airflow.
½
HP Blower ¾ HP Blower
S1-4
S1-5 (42, 56 & (84, 98 &
70 KBTU) 112 KBTU)
OFF OFF 788 CFM 1313 CFM
(Factory Setting)
ON OFF 656 CFM 1050 CFM
OFF ON 525 CFM 919 CFM
ON ON 394 CFM 788 CFM
Airflow dipswitches are to be used to determine airflow
when a legacy (24 VAC) call is placed on the thermostat
inputs of the control. Communicated calls will have CFM
requirements as part of the call (when a legacy condenser
is attached to a communicating furnace the airflow de-
mand will be transmitted from the communicating thermo-
stat as the installer will configure the cooling airflow
requirements for the non-communicating condenser at the
thermostat and the airflow requirements for the condenser
will be stored at and transmitted from the thermostat).
D. Cooling/Heat Pump Airflow Trim; S1-6 & S2-7
Two dipswitches (S1-6, S2-7) are to be provided
for legacy cool airflow trim. The value used for
each selection is specified below. Two of these val-
ues are taken from the furnace Model Data file.
Selections are as follows:
S1-6 S2-7 Description
OFF OFF No Adjust. (Factory Setting)
ON OFF +10%
OFF ON -10%
ON ON No Adjust.
E. ODD (On Demand Dehumidification); S2-8
One dipswitch (S2-8) is to be provided to enable
the dehumidification feature in legacy mode. Se-
lections are as follows:
S2-8=OFF ODD not enabled.
(Factory Setting)
S2-8=ON ODD enabled. 0VAC on
“HUM STAT” will decrease
airflow in cooling.
F. Tandem Airflow Select; S2-9
One dipswitch (S2-9) shall be used to select the
percentage of airflow for the base first stage cool-
ing airflow in legacy mode. Note that further ad-
justments may also be applied (e.g. for active
dehumidification or cooling airflow trim).
Communicating Furnace
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