Dometic FreshJet 3 Series Installation And Operation Manual page 20

Operation
10 .3 .4 Selecting standby
Press and release the On/Standby icon.
When Standby is active:
• The AC is idle.
• The On/Standby icon illuminates at 50% brightness.
• The LED display is off.
• The Interior Light and Exterior Light icons
illuminate at 50% brightness.
10 .3 .5 Setting the Auto mode
For the Auto mode and the specified selections
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to operate effectively, the rooftop component
must be a heat pump or have a furnace wired to
the electronic control box. The Auto Mode icon
will not illuminate without a heat pump or furnace
present.
1. Press and release the Auto Mode icon.
2. To specify the temperature, press the ( + /
set a desired temperature between 40 °F and 90 °F
(4 °C and 32 °C). The default setting is 70 °F (21 °C).
The ( + / ) icon illuminates at 100% brightness
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during selection and then remains illuminated at 50%
brightness after the button is released.
All unselected icons illuminate at 50% brightness.
3. To turn off Auto mode, select a different mode or turn
the on/standby button off.
When the Auto mode is active, one of the following
operations can occur:
• Auto Change Over Cooling: If the room temperature
rises above the setpoint by 2 °F (1 °C), cooling is
initiated. The unit stays on until the room temperature
drops to the setpoint, and then turns off.
• Auto Change Over Heating: If the room temperature
drops below the setpoint by 2 °F (1 °C), heating
is cycled on and off based on the measured room
temperature and the setpoint temperature. If more
than one heat source is available, the priority for
selecting the auxiliary heat source is: heat pump (first)
then furnace (second).
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Rooftop Air Conditioner (Air Distribution Box, Electronic Controls)
The heating source stays on until the room
temperature reaches the setpoint, then the heating
source turns off.
During Auto Change Over Heating, if the heat pump
operation is inhibited, the LED display flashes LO to
indicate an outdoor temperature of 29 °F (-2 °C) or
lower. The user must select an alternate heat source
within the vehicle.
• Auto Fan Cycling: The Auto mode defaults to Auto
Fan regardless of the fan speed selection.
With Auto Fan Cycling, the fan cycles on and off
automatically, based on the temperature differential
between the room temperature and the setpoint
temperature.
The fan operates at Turbo speed when the room
temperature is above the setpoint temperature by
more than 8 °F ±0.5 °F (5 °C ±0.3 °C).
The fan operates at High speed when the room
temperature is above the setpoint temperature by
5 °F to 7 °F ±0.5 °F (3 °C to 4 °C ±0.3 °C).
) icon to
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The fan operates at Low speed when the room
temperature is above the setpoint temperature by less
than 4 °F ±0.5 °F (2 °C ±0.3 °C).
10 .3 .6 Setting the Cool mode
1. Press and release the Cool Mode icon.
2. To specify the temperature, press the ( + /
set a desired temperature between 55 °F and 90 °F
(13 °C and 32 °C).
The ( + /
during selection and then remains illuminated at 50%
brightness after the button is released.
All unselected icons illuminate at 50% brightness.
3. Select the fan speed in Fan mode.
Pressing the fan speed button shows the current fan
speed. Pressing again will allow the fan to change to
desired speed.
When the Cool mode is active:
• The system cycles cooling on and off based on
the measured room temperature and the setpoint
temperature.
) icon illuminates at 100% brightness
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) icon to
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