Q3 & Qht Controls for Direct Expansion Systems Programmable Functions
L-2516 ENGLISH 13
24: Seawater Low Limit Adjustment
(Optional; Factory Default: 40
°F)
If the optional seawater sensor is connected to the control board, this feature allows the system to switch from reverse-cycle
heat to electric heat (if an auxiliary electric heater is installed and enabled) if the seawater temperature drops below 40°F
(4.4°C) (default) and the reverse-cycle heat has operated more than five minutes. Once the seawater rises 3°F above the
Seawater Low Limit temperature, the system returns to reverse-cycle heating. If an aux heater is not installed, the system will
shut down and flash “LO” then “SE” when the seawater drops below 40°F (4.4°C) (default). Once the seawater rises 3°F above
the Seawater Low Limit temperature, the system goes back into reverse-cycle heating and stops flashing “LO” then “SE”. The
range of adjustment is 35°F to 50°F.
25: Humidity Sensor Limit Adjustment
(Optional; Factory Default: 60%)
If the optional humidity sensor is connected to the control board, this feature allows the system to dehumidify with electric heat
(if electric heat is installed and enabled) when the cabin humidity rises above 60% (default) relative humidity (RH). When the
room temperature has reached the set point, the compressor will turn off. The display will indicate that the system is in
"Dehumidify" mode. If the temperature decreases by one degree, the electric heat will turn on to maintain the set point. If the
temperature increases back to set point, the electric heat will turn off. If the temperature increases one degree above the set
point, the compressor will then turn back on. This operation will continue until the cabin’s relative humidity is less than 60%
(default). If an electric heater is not installed, the compressor run time will extend by operating to 1°F lower than set point. This
cycle continues until the cabin’s relative humidity is less than 60% (default). The range of adjustment is 50% to 80% RH.
26: Air Filter Timing Setting and Reset
(Factory Default: 0)
Use this feature for a reminder to clean or replace the unit’s air filter. Select the number of operating hours until the filter
reminder appears in the display flashing “Ar” then “FL”. The value entered represents that number times 100 hours. Function
values are between 1 (100 hours) and 25 (2500 hours). Dometic recommends that you check the air filter at least every 500
hours of operation. The default setting is off, designated with “00”. To reset the timer and stop the flashing filter reminder, press
the FAN, UP, and DOWN buttons simultaneously.
27: Select FAMU Operation (future feature)
28: CAN Bus Unit ID
(Factory Default: 59)
This feature allows all units with a CAN Bus adapter installed to be networked together to communicate with each other or the
ship’s CAN Bus system (with additional translator equipment in some cases). Enter the unit’s CAN Bus Unit ID number.
29: CAN Bus Group ID
(Factory Default: 58)
This feature allows all units with a CAN Bus adapter installed to be grouped together in a network system and communicate with
the ship’s CAN Bus system (with additional translator equipment in some cases). Enter the unit’s CAN Bus Group ID number.
30: Custom Medium Fan Speed (only with U-Board platform)
(Factory Default: 2)
You can set the number of fan speeds that can be modified by selecting either 2 or 5 speeds (if function 22, Fan Speed Division,
is set to 5). If function 22 is set to 3, the selection options for function 30 will be 2 or 3, and if 3 is selected, then function 32,
Medium Fan Speed, will be enabled. If function 22 is set to 5, you can modify 3 more fan speeds: Medium Low, Medium, and
Medium High, as functions 31, 32, and 33 are enabled.
31: Fan Speed Medium Low (only with U-Board platform)
(Factory Default: 50)
You can adjust the Medium Low fan speed to suit individual preferences. For instance, you may wish to decrease the Medium
Low fan speed setting in your stateroom to minimize fan noise.
32: Fan Speed Medium (only with U-Board platform)
(Factory Default: 62)
You can adjust the Medium fan speed to suit individual preferences. For instance, you may wish to decrease the Medium fan
speed setting in your stateroom to minimize fan noise.
33: Fan Speed Medium High (only with U-Board platform)
(Factory Default: 74)
You can adjust the Medium High fan speed to suit individual preferences. For instance, you may wish to decrease the Medium
High fan speed setting in your stateroom to minimize fan noise.
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