Dometic Q3 User Manual

Q3 & Qht Controls for Chilled Water Systems Operator Controls and Display Panel
L-2962 ENGLISH 5
strain relief and to prevent the sensor from being accidentally removed. Plug the sensor’s 2-pin connector into the ”Loop Water
In (red) socket located in the corner of the circuit board.
LOOP OUTLET TEMPERATURE SENSOR - OPTIONAL
Install the optional tempered water loop outlet temperature sensor on the return pipe that is leaving the air handler. Ensure that
the sensor is in direct contact with the copper pipe and use thermal mastic to ensure good heat transfer. Strap the sensor wire in
place for strain relief and to prevent the sensor from being accidentally removed. Plug the sensor’s 2-pin connector into the
”Loop Water Out (blue) socket located in the corner of the circuit board.
OUTSIDE AIR TEMPERATURE SENSOR - OPTIONAL
Install the optional outside air temperature sensor to monitor temperature outside the cabin. Outside air sensor cables are
available in various lengths. Mount the sensor outside but not in direct sunlight. Plug in the sensor’s 6-pin connector to the
socket labeled “Outside Temp” (P3) located on the edge of the circuit board.
HUMIDITY SENSOR - OPTIONAL
Install the optional humidity/temperature combo sensor to monitor the relative humidity of the cabin. Locate the sensor in the
same location as the ambient air temperature sensor. Plug in the combo sensor’s 6-pin connector to the “Inside Temp” (P2)
socket located on the edge of the circuit board. The control board automatically detects the presence of this combo sensor and
immediately starts measuring humidity.
OPERATION
OPERATOR CONTROLS AND DISPLAY PANEL
For the button locations and display functions, refer to Figure 1, Table 1 on page 2 for the Q3 control and to Figure , Table 2 on
page 3 for the Qht control.
BUTTON FUNCTIONS
• POWER button (Qht only) - Press and release to toggle between the On and Off Modes.
• MODE button - Press and release to toggle between the Off (Q3 only) and all other modes of operation.
• UP button - Press and release to display the set point. Press and hold the UP button to increase the set point. Set
point increases one degree each time the button is pressed.
• DOWN button - Press and release to display the set point. Press and hold the DOWN button to decrease the set
point. Set point decreases one degree each time the button is pressed.
• FAN button - Press to select the Automatic Fan Mode, the Manual Fan Mode, or to advance through the manual fan
speeds.
• Display Supply Loop Water Temperature - The supply loop water temperature sensor must be used to sense
constant loop water supply. Press the MODE and FAN buttons simultaneously to display the loop water temperature. If
the loop water sensor is open or shorted (closed), the display flashes “- -” instead of a temperature reading.
• Q3 - The display flashes “IL” for one second then the loop water temperature displays in two segments: The
display flashes the first digit of loop water temperature for one second, then the next two digits of loop water
temperature for one second. The cycle repeats until the buttons are released.
• Qht - The word WATER displays, “IL” flashes for for one second, then the loop water temperature displays in two
segments: The display flashes the first digit of loop water temperature for one second, then the next two digits of
loop water temperature for one second. The cycle repeats until the buttons are released.
• Display Return Loop Water Temperature (optional) - Press the FAN and UP buttons simultaneously to display the
return loop water temperature (optional). If the return loop water temperature is not available, open or shorted (closed),
the display flashes “- -” instead of a temperature reading.
• Q3 - The display flashes ”OL” for one second then the return loop water temperature displays in two segments:
The display flashes the first digit of the return loop water temperature for one second, then the next two digits of
the return loop water temperature for one second. The cycle repeats until the buttons are released.
• Qht - The word WATER displays, ”OL” flashes for one second, then the return loop water temperature displays in
two segments: The display flashes the first digit of the return loop water temperature for one second, then the next
two digits of the return loop water temperature for one second. The cycle repeats until the buttons are released.
• Display Outside Temperature (optional) - Press the FAN and DOWN buttons simultaneously to display the outside
temperature (optional). If outside temperature is not available, open or shorted (closed), the display flashes “- -”
instead of a temperature reading.

Dometic Q3 Specifications

General

Brand	Dometic
Model	Q3
Category	Control Unit
Language	English