Description of the Controls Q3 and Qht Controls for Direct Expansion Systems
4 L-2516 ENGLISH
Figure 2: Qht Diagram - Control Display Panel and Indicators
Table 2: Qht Diagram Description of Control Display Panel and Indicators
1 Data Display - Large LCD readout displays current temperature,
set point, programmed values and error messages.
9 Fan Speed Indicator - A row of five bars indicate the current fan
speed, with more bars indicating a higher fan speed and fewer bars
indicating a lower fan speed.
2 Set Point Indicator - Display shows SET when set point is being
adjusted. Normally display defaults to inside temperature.
10 Fan Mode Indicator - The word MANUAL displays when the fan is
running in Manual Fan Mode. The word MANUAL does not display
when the fan is running in Automatic Fan Mode.
3 Aux Heating Indicator and Aux Heat Mode Indicator (optional) -
A solid dot displays next to the words AUX HEAT when the electric
heater is on and running in Aux Heat mode. The words AUX HEAT
display when you are in Aux Heat mode. (Press the MODE button
to select the optional Aux Heat Mode.) See Programmable Function
“23: Aux Heat Enabled/Disabled” on page 12.
11 Dehumidify Mode Indicator - The word DEHUMIDIFY displays
when you are in Dehumidification Mode. It flashes if optional
humidity sensor is connected and operating in the Cooling Mode.
(Press the MODE button to select Dehumidification Mode.)
4 Heating Indicator - A solid dot displays next to the word HEAT
when the compressor is on and running in Heat mode.
12 FAN Button - Press to select Manual or Automatic Fan Mode,
indicated by the word MANUAL displaying or not displaying. In
Manual Fan Mode, additional presses of the FAN button will adjust
fan speed higher, then lower, then back to Automatic. In Automatic
Fan Mode, fan speed is controlled by the control board as a
function of the difference between set point and inside
temperature. See Programmable Function “4: Fan Response
Differential” on page 9.
5 Cooling Indicator - A solid dot displays next to the word COOL
when the compressor is on and running in Cool mode.
13 UP Button - Press to adjust set point up. In programming mode
press to scroll through program modes and adjust values.
6 Cool Mode Indicator - The word COOL displays when you are in
Cool mode. (Press the MODE button to select Cool Mode.)
14 DOWN Button - Press to adjust set point down. In programming
mode press to scroll through program modes and adjust values.
7 Heat Mode Indicator - The word HEAT displays when you are in
Heat mode. (Press the MODE button to select Heat Mode.)
15 MODE Button - Press to cycle through the modes of operation
(refer to indicators). Mode sequence selections are COOL, HEAT,
AUTO, AUX HEAT (optional), and DEHUMIDIFY.
8 AUTO Mode Indicator - A bracket and the word AUTO display to
the right of the words COOL and HEAT when you are in Auto Mode.
If optional Aux Heat is enabled (see Programmable Function “23:
Aux Heat Enabled/Disabled” on page 12), a bracket and the word
AUTO display to the right of the words COOL and AUX HEAT.
(Press the MODE button to select Auto Mode.)
16 POWER Button - Press to turn the system on and off. Note that
the Data Display remains on in the Off mode. You can continue to
adjust set point, display temperature readings and activate the
manual fan to circulate air while the system is in the Off Mode.
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