Page 48
XP21
Configuring Unit
For the new outdoor control to work correctly, it MUST BE programmed for unit type (AC or HP and number of stages), unit
capacity and outdoor fan profile (RPM). The new outdoor control has an auto−detection feature that will determine the unit
type. The following set up procedures MUST be done on all new outdoor controls.
Auto−Detection of Unit Type (air conditioner or heat pump and number of stages)
During initial power−up the control will auto−detect the unit
type. The unit type is determine by what is connected to
various outputs on the new control.
OUTDOOR CONTROL
SEVEN−SEGMENT
DISPLAY
PUSH BUTTON
BLACK
BLACK
Anytime there is a connection to O OUT terminal, the
control will detect the unit type as a heat pump.
Anytime there is no connection to O terminal, the
control will detect the unit type as a air conditioner.
Anytime there is a connection to Y2 OUT terminal,
the control will detect the unit as two−stage.
Anytime there is no connection to Y2 terminal, the
control will detect the unit as one−stage.
If the control auto−detects the unit type incorrectly it may be due to the
control being miswired, loose connection or missing connection to
the required control output terminal. Disconnect power to the control,
verify connections, correct wiring and reconnect power. Verify that
the correct unit type is displayed on the seven−segment display.
The unit capacity and fan speed are manually
configured. Until those parameters are configured the
7−segment display will show 3 bars for the unit capacity
and fan speed.
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