Configuring The Electronic Control Box - Dometic FreshJet 4 Series Installation Manual

Rooftop air conditioner (FreshJet return air grille, wall thermostat controls)
8 .3 Configuring the electronic
control box
This section describes how to set the DIP switches for
your unit's electronic control box and to complete the
system reset.
8 .3 .1 Locating the DIP switches
19 Electronic control box DIP switch location
DIP switch
q w
The electronic control box is located at the return air
opening on the base of the AC and the DIP switches are
visible through the opening.
The DIP switches are set to the Off position when
shipped from the factory, except for heat pump models.
Placing the switch in the On position selects that option.
8 .3 .2 Setting the DIP switches
This section describes the appropriate electronic
control box DIP switch settings. The position should be
set to the appropriate On or Off position based on the
equipment options installed by the RV manufacturer.
20 DIP switch board
On or closed switch position
q
Off or open switch position
w
EN
w w
q q
ON
1 2 3 4 5 6 7 8 9 10
Electronic control box
q q
w w
If your RV has more than one electronic control box
installed, configure each electronic control box with the
appropriate DIP switch settings.
If necessary, press each switch On (Closed) or Off (Open)
according to the following configuration table.
DIP switch setting configuration
DIP location
Each thermostat can have up to four
1 Zone 2
zones. If only one rooftop component is
2 Zone 3
installed, it becomes zone 1 by default
and DIP switch settings for zones 2, 3, or
3 Zone 4
4 are not required.
If more than one rooftop component is
installed, assign each rooftop component
a separate zone (2 through 4). Each
rooftop component must have a different
zone setting.
For applications requiring two
4 Stage
rooftop components to work together in
the same zone, set the Stage DIP switch
to the On position.
Otherwise, leave in the Off position.
If a Furnace/hydronic heating
5 Furnace
1
system has been connected to this
rooftop component, set the Furnace DIP
switch to the On position, otherwise,
leave in the Off position.
To configure the Automatic Generator Start
6 Gen Start
1
for a new installation, refer to "Routing an
automatic generator start (AGS) feature via
RV-C (optional)" on page 15. Leave this
DIP switch in the Off position, unless it is
required for backwards compatibility using
the CMC protocol.
Leave this DIP switch in the Off position,
7 Heat strip
1
unless it is required for backwards
compatibility using the CMC protocol.
For Heat Pump models, this DIP switch is
8
2
Heat pump
set in the On position from the factory.
For non-Heat Pump models, change this
DIP switch to the Off position.
The Dehumidify is not used on this
9 Dehumidify
1
rooftop component.
Leave this DIP switch in the Off position,
unless it is required for backwards
compatibility using CMC protocol.
10 120 ohm
This DIP switch is in the On position from
CAN
the factory to enable RV-C (CAN BUS)
termination
communication. Only the first and last
resistor
devices on the CAN bus should enable
the 120 ohm termination resistor.
1,3
Climate Module Communication (CMC) only
1
Current or CMC communication only
2
ON by default for RV-C
3
Installation
Description
19