Dometic Qht User Manual

Q3 & Qht Controls for Direct Expansion Systems Description of the Controls
L-2516 ENGLISH 3
DESCRIPTION OF THE CONTROLS
Figure 1: Q3 Diagram - Control Display Panel and Indicators
Table 1: Q3 Diagram Description of Control Display Panel and Indicators
1
Data Display - Large LED readout displays current
temperature, set point, programmed values and error messages.
9
AUTO Mode Indicator - Lights when Auto Mode is selected.
Flashes if optional Aux Heater is enabled (see Programmable
Function “23: Aux Heat Enabled/Disabled” on page 12).
2
AUTO Fan Mode Indicator - Lights when fan is running in
Automatic Fan Mode.
10
HEAT/AUX HEAT Mode Indicator - Lights when Heat Mode
is selected or indicates compressor is on when heating in
AUTO mode. Flashes when you press the MODE button a
second time in Heat Mode to select the optional Aux Heat
Mode (refer to Aux Heat Operation).
3
Fan Speed Indicators - Column of three LEDs that indicate
the current fan speed of high, medium, or low (refer to fan speed
operation).
11
COOL Mode Indicator - Lights when Cool Mode is selected
or indicates compressor is on when cooling in AUTO mode.
4
FAN Button - Press to select Automatic or Manual Fan Mode,
indicated by the AUTO Fan LED indicator being on or off. In
Manual Fan Mode, additional presses of the Fan button will
adjust fan speed higher, then lower, then back to AUTO. In
AUTO Fan, 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.
12
OFF Mode Indicator - Lights when system is off. Note that
the Data Display remains on. 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.
5
UP Button - Press to adjust set point up. In programming mode
press to scroll through program modes and adjust values.
13
Cooling Indicator - A dot in the upper left corner of the data
display lights to indicate the compressor is running in COOL
mode. In AUTO mode, the COOL LED indicator lights to
indicate the compressor is running.
6
DOWN Button - Press to adjust set point down. In
programming mode press to scroll through program modes and
adjust values.
14
Heating Indicator - A dot in the upper left corner of the data
display lights to indicate the compressor is running in HEAT
mode. In AUTO mode, the HEAT LED indicator lights to
indicate the compressor is running.
7
MODE Button - Press to cycle through the modes of operation
(refer to indicators). Mode sequence selections are OFF, COOL,
HEAT, AUX HEAT (optional), AUTO, and DEHUMIDIFY.
15
Set Point Indicator - A dot in the upper center of the display
lights to indicate the set point is being adjusted. Normally
display defaults to inside temperature.
8
DEHUMIDIFY Mode Indicator - Lights when the Dehumidify
Mode is selected. Flashes if optional humidity sensor is
connected and operating in Cooling Mode.
16
Manual Fan Mode Indicator - AUTO Fan indicator turns off
when fan is running in Manual Fan Mode.
4
1
2
3
765
8
9
11
12
13,14 15,16
10

Dometic Qht Specifications

General

Brand	Dometic
Model	Qht
Category	Control Unit
Language	English