Dometic FreshJet 4 Series Installation Manual page 17

Rooftop air conditioner (FreshJet return air grille, wall thermostat controls)
I The pins of both RJ-45 plugs must match: pin 1
must connect to pin 1 on the other connector, pin 2
must connect to pin 2 on the other connector, and
continuing for all remaining pins. Pins 3 and 6 must
be twisted at minimum rate of 25 twists per 39 in.
(1 m).
15 Wiring to the thermostat
2. Insert the 8-conductor communication cable through
the hole in the base plate.
16 RJ-45 connector
RJ-45 cable connector
q
3. Insert the RJ-45 connector into the RJ-45 jack on the
back of the thermostat.
4. Go to "Mounting the thermostat" on page 17 to
install the thermostat onto the wall.
EN
q q
8 .1 .2 Using RV-C BUS and multiplexer to
supply CAN communication to the AC
If installing RJ-45 wiring, go to "Using independent
I
RJ-45 wire to supply communication to the
thermostat" on page 16.
1. Cut back the outer cable shield 3.0 in. (76 mm) and
strip 0.3 in. (7.6 mm) of insulation from each wire.
q q
w w
17 Connecting the thermostat communication cable plug to the
thermostat terminal block
Thermostat
q
terminal block
2. Terminate the wires into a 4-pin Molex Mini-Fit Jr.
receptacle using the correct pin assignments below:
a. Connect Pin 1 to the (+) 12 V terminal.
b. Connect Pin 2 to the GND terminal.
c. Connect Pin 3 to the CAN_H (CAN Hi) terminal.
d. Connect Pin 4 to the CAN_L (CAN Lo) terminal.
3. Inspect all the connections to make sure they are tight
and not touching any other terminals or wires.
8 .1 .3 Mounting the thermostat
1. Avoid pinching or bending the connected wiring
cable(s) and tuck the cable(s) into the wall opening.
Installation
Thermostat
w
communication cable
17