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Programmed blower speed taps are as follows (see also
Figure 28):
Speed Tap 1: Vent/blower only speed
Speed Tap 2: Balanced Climate speed
Speed Tap 3: Default LO cooling & heating speed.
Energized by default for cooling operation through the
blower speed tap selection and is labeled as LO.
Speed Tap 4: Optional MED Cooling & heating speed.
Selected manually through the blower speed tap
selection and is labeled as MED.
Speed Tap 5: Optional HI cooling & heating speed.
Selected manually through the blower speed tap
selection and is labeled as HI.
FIGURE 28
Speed Taps
Orange Wire
w/Black Stripe
Speed Tap 1 – Vent/Blower Only
Speed taps 1 and 3 are programmed to identical
torque settings in the ECM motor. This means that if
speed tap 1 is energized, the airflow amount will be
the same as default airflow. Tap 1 is used when a vent
is installed and ventilation is called for by energizing
the A terminal of the low voltage terminal block with
24VAC. Speed tap 1 is the lowest priority; if any of the
other speed taps are energized, they will override speed
tap 1.
Speed Tap 2 – Balanced Climate
Speed tap 2 is programmed to a lower than rated speed
in the ECM motor. In order for Balanced Climate speed
to be used during compressor cooling mode, the jumper
between Y1 and Y2 must be removed. This means that
if speed tap 2 is energized, the airflow amount will be
lower than default airflow. Tap 2 is used when Balanced
Climate is called for by energizing the Y1 terminal of
the low voltage terminal block with 24VAC. Speed tap 2
is overridden if taps 3, 4, or 5 are energized.
Speed Tap 3 – Default LO Cooling & Heating
Speed tap 3 is programmed for rated speed in the
SelecTech motor. This means that if speed tap 3
is energized, the airflow amount will be the default
airflow. Tap 3 is used by default when cooling is called
for by energizing the Y1 terminal of the low voltage
terminal block with 24VAC. The unit is shipped with
the jumper between Y1 and Y2 installed and it must
be removed to use Balanced Climate mode. The unit
is shipped with the orange/black wire connected to
terminal LO (rated speed) on the blower selection
speed terminal block. Speed tap 3 can be overridden
if taps 4 or 5 are energized by changing the position
of the orange/black wire on the blower selection speed
terminal block to MED (4) or HI (5) positions.
Speed Tap 4 – Optional MED Cooling & Heating
Speed tap 4 is programmed to a higher than rated
speed in the ECM motor. This is a user-selectable
airflow amount that will be higher than rated airflow.
Tap 4 is used for cooling operation if the orange/black
wire on the blower speed selection terminal block is
moved to MED. Speed tap 4 can be overridden if tap 5
is energized.
Speed Tap 5 – Optional HI Cooling & Heating
Speed tap 5 is programmed to the highest speed in the
ECM motor. This is a user-selectable airflow amount
that will provide the highest rated airflow. Tap 5 is used
for cooling operation if the orange/black wire on the
blower speed selection terminal block is moved to HI.
Dirty Filter Switch
1. Disconnect all power to the unit. Remove control
panel outer cover and upper front panel.
2. The dirty filter switch is located on top of the filter
partition between the blower wheels (see Figure
29 on page 36). The dirty filter indicator light and
reset switch is located on the right side of the filter
access opening above the control panel. Remove
the cover on the dirty filter switch and ensure the
knob is set at 0.4" W.C. (see Figure 30 on page
37). This is only a recommended starting point
prior to making switch adjustments. Switch setting
is highly dependent on filter type used, blower
speed, unit ducting and other unit installation
characteristics. See Dirty Filter Switch Adjustment
for how to make proper switch adjustments.
3. Re-install upper front panel.
Dirty Filter Switch Adjustment
1. Apply power to the unit.
2. Turn the unit indoor blower on (energize R-G on low
voltage terminal board).
3. With air filters installed and switch initially set
at 0.4" W.C. (see Step 2 under Dirty Filter
Switch), begin restricting the air filter of the unit
Manual 2100-720E
Page
35 of 42
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