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OPERATING THE SYSTEM WITH QT CONTROLS
OPERATING THE SYSTEM WITH QT CONTROLS
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Use the COOL, HEAT or AUTO button to start desired function. To adjust setpoint, push plus (+) or minus (-) button to increase
or decrease temperature in single increments or press and hold either button to scroll temperature until desired setpoint is
reached. The plus button allows the setpoint to increase and the minus button decreases the setpoint. The fan speed
automatically adjusts to the temperature difference between the setpoint and inside temperature, or it can be set manually by
pushing the fan button.
The Qt Control/Display is arranged for logical operation. (See Figure 14.)
1.
Data Display - Large LED readout that provides indication of current setpoint, temperatures, programmed values and
fault/error messages.
2.
Mode Key - Enables user to cycle through the different modes (refer to indicators).
The mode sequence begins OFF, COOL, HEAT, AUTO, OFF.
3.
Cool Mode Indicator - Lights when COOL mode is manually selected or when compressor is on during AUTO mode.
4.
Heat Mode Indicator - Lights when HEAT mode is manually selected or when heating element is on during AUTO
mode.
5.
Auto Indicator - Lights when system is in automatic changeover mode. It will switch from cooling to heating as
needed. Fan speed is automatically selected.
6.
Plus (+) and Minus (-) Keys - Raises or lowers the setpoint. In programming mode, these keys change function
numbers and corresponding values. Press and hold keys for large changes.
7.
Fan Key - Selects manual fan control. In the OFF mode, pressing this key will start the fan in manual mode.
8.
Off Indicator - Lights when the system is de-energized (by pressing the MODE key). Data display remains on.
Setpoint adjustments, temperature displays and manual fan controls remain active when the system is in the OFF
mode.
9.
Fan Speed Indicators - Row of four small LEDs beside the fan key. The top light indicates the fan is in AUTO mode,
the bottom light indicates low fan speed, and the other two lights indicate medium and high speed. When AUTO fan
LED is not lit, the fan is in manual mode and fan speed can be adjusted by pressing the fan key.
10. Cooling or Heating Indicator - When COOL or HEAT mode is manually selected, the dot in the upper-left corner in
the data display will illuminate when the compressor is running in COOL mode or the heater element is running in
HEAT mode.
NOTE: This indicator does not function during AUTO mode. The compressor and heating element "power up" is
indicated by the HEAT and COOL mode indicator lights. See sections 3 and 4 above.
Figure 14: The Qt Control/Display
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bo Split System Manual
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Troubleshooting
