46
& 4, 5 & 6, 7 & 8, and 10 & 11. The
assignments of the switch pairs are
shown in Table 8 and Figure 46.
*IMPORTANT:
Only traditional
humidistats will work with this feature.
Dehumidistats
will not
work properly
with this feature.
HEATING AIRFLOW
ADJUSTMENTS
The furnace is shipped with low and high
fire heating airflows. These are set from
the factory to let the furnace operate at
the mid point of the temperature rise
range. The temperature may vary slightly
due to furnace input manufacturing
tolerances and voltage variations.
In the heating mode, the ECM motor is
programmed to ramp up to its target
CFM over a fifteen (15) second period.
After any of the user selected “Off”
delays the ECM motor will ramp down to
50% of steady state CFM for
approximately thirty (30) seconds. The
motor will then ramp down to off.
COOLING AIRFLOW
ADJUSTMENTS
See Table 13 for airflow options.
Furnaces are shipped from the factory set
for maximum cooling airflow. Adjustments
to the cooling airflow may be made using
switches 7 and 8 as shown in Table 9.
TWO-STAGE COOLING
SELECTION
Dipswitch SW1, Position #12 on the
Integrated Furnace Control (IFC) ships
from the factory in the “ON” position. This
dipswitch is to be used to designate single
or two-stage cooling to the IFC. The “ON”
(as now shipped) position designates a
single-stage air conditioning system or
heating-only application. The “OFF”
position designates a two-stage air
conditioning system. Turn the switch to
the “OFF” position when using two-stage
cooling with separate contactors, Y1 and
Y2. Failure to do this will mean that the air
conditioner will never go into low stage.
2-Stage Cooling Systems = #12 OFF
1-Stage Cooling Systems = #12 ON
CONTINUOUS FAN
ADJUSTMENTS
There are two options for the adjustment
of continuous fan. With switch 9 “ON” the
speed will be high fan. With switch 9
“OFF” the speed will be low fan.
SETTING BLOWER OFF
TIMINGS FOR COOLING
AND HEAT PUMP
OPERATION
There is a jumper (P6) on the main
furnace control board for setting
blower off timings. (See Figure 45.)
DEHUMIDIFICATION
The interface control has two optional
24 volt AC only inputs. The “B”
terminal input is provided for heat
pump applications. This signal comes
from a heat pump thermostat and tells
the heat pump to switch its reversing
valve to heat mode. If this “B” signal is
also routed to the furnace control, all
airflow adjust switches (7 & 8 of SW1)
and “On Demand Dehumidification”
are bypassed in the heat mode only.
The airflow will remain at the normal
airflow as selected by switches 5 & 6
throughout the heat mode. This allows
the user to have a switched (reduced)
airflow adjustment for dehumidification
or the “On Demand Dehumidification”
in cooling mode, but not the adverse
humidity and heat rise effects of using
these adjustments during a heat
pump’s heat mode. The “B” terminal
does not apply to gas operation.
The “On Demand Dehumidification”
(ODD) input allows the user to have
automatic dehumidification that is
controlled by the user’s humidistat
setting. Dehumidistats are not
compatible with the furnace control.
When the humidity exceeds the
humidistat setting, it routes a 24 volt,
AC only, signal to the “On Demand
Dehumidification” terminal.
Conversely, it will route 0 volts (turn
off) when a call for dehumidification is
required. When no voltage is present
on ODD and the ODD feature is
enabled (see Table 12), cooling airflow
is decreased 15%. This results in
higher latent capacity and increases
the level of comfort. This feature is
only available in the cooling mode.
NOTE:
Use a 3/32” allen wrench or
small-blade screwdriver for making
the pressure adjustment.
FIGURE 47
FIGURE 46
BLOWER OFF TIMINGS
UTEC 1095-101 CONTROL WITH INTERFACE BOARD AND ECM MOTOR
OFF
ON
HEAT TEMP RISE ADJUST
NOT USED
COOLING, H/P AIR FLOW
LATENT/SENSIBLE AIR FLOW ADJUSTMENT
CONTINUOUS FAN AIR FLOW
DEHUMIDIFICATION SETTINGS
2 STAGE COOLING (OFF = 2 STAGE COOL, ON = 1 STAGE COOL)
TABLE 9
AIR FLOW ADJUSTMENT (SWITCHES 7 & 8)
Switch
Air Flow
Selection
Adjustment
A
No Adjustment
B
+10%
C
-10%
D
No Adjustment
