Carrier 50FC Installation, Operation And Maintenance Instructions page 25

8 - ELECTRICAL CONNECTION
■ This probe must be fastened to the panel or the wall of the room
to be conditioned, at ca. 1.5 m height.
Electrical connection
■ Make the electrical connection according to the unit confi guration:
- NTC Probe S5a: B5 (connector
J3): with 2 x 1,5 mm section cable,
2
within a maximum distance of 30
meters.
- 1 to 4 RS485 probes (connector
J10): with AWG20 section cable,
single braided pair preferably
shielded with drain wire + Power
supply 24 Vac (2 wires).
• Temperature:
S21 to S24.
• Temperature + humidity:
S31 to S34.
Note: in the case of more than one
probe, connection of the probes
in series, in the RS485 network.
Please, refer to the control manual.
Connection of the outdoor humidity probe (optional)
The outdoor humidity probe (optional), necessary for the enthalpic
and thermo-enthalpic free-cooling, must be installed on-site, on
the hood of the fresh air intake.
■ Open the case by turning the top cover anticlockwise (fi g1).
■ Fasten the rear of the sensor case to the side panel of the hood
(use the screws supplied together with the probe) placing the
screws in the holes provided (fi g.2).
■ Make sure that the screws that hold the board protective cover
are fastened tightly (fi g.3).
■ Close the sensor by turning the cover clockwise (fi g.4).
(fi g.1)
(fi g.3)
S5a
NTC NTC
105 106
Electric
panel
B5 (J3)
S21 (T)
S31(T+H)
+(G) (G0) Tx Rx- Tx Rx+ GND
No1
RS485
network
110 111 112 113 114
24Vac
Electric
panel
B10
The installer must feed the W34 cable through the M16 feedthrough
to connect it in the BOX3, located inside the unit, behind the side
access panel.
Electrical connection
(fi g.2)
BOX3 (teminals)
Black: 35
Brown: 31
(fi g.4)
Grey: 36
Humidity probe position
W34
Outdoor
humidity
probe
Probe (teminals)
Black: G+
Brown: M
Grey: H
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