Carrier 50NC Series - Sensors Connection by the Costumer

20
8 - ELECTRICAL CONNECTION
- 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.
Electrical connection
S5a
105
B5 (J3)
106
Electrical
cabinet
NTC NTC
S21(T)
S31(T+H)
+(G) (G0)
Tx
Rx-
Tx
Rx+
GND
Electrical
cabinet
B10
110
n.1
111 112 113 114
24Vac
AWG20
RS485
network
Connection of the outdoor humidity probe (optional)
The outdoor humidity probe (optional) replaces the outdoor
temperature probe and is used with enthalpic and thermo-
enthalpic free-cooling.
Assembly and setting instructions
This probe is installed, on site, in the return air duct of the
outdoor module.
● Fasten the sensor bracket to the
air duct.
● Insert the rod on the bracket to the
required depth.
● Tighten the screw on the bracket
to fasten.
61
120°
120°
25
42
98
PG9
n°3 Ø 2,75
Ø 17
37,5
43,3
==
● For the electrical connections, remove the top cover of the
sensor. Remove the cover by rotating it anticlockwise.
View of sensor without cover Interior view
The costumer must connect on-site the following probes:
● Ambient NTC (standard) or RS485 (optional).
● Outdoor humidity (optional).
● Air quality (optional).
These probes are supplied inside the electrical cabinet.
Please refer to the wiring diagram provided with the unit.
8.6 Sensors connection by the costumer
Connection of the ambient probe
● Open the case using a fl athead screwdriver in the slot, paying
extra care not to damage the electronic parts.
HILO5270
HILO5271
HILO5272
G+ NTC M HNTC
H
H
J3
J2
J1
J7
DP1
DP2
ON
OFF
124
121
125
123
122
B2 (J3)
+Vdc (J2)
GND (J3)
B5 (J3)
Electrical cabinet
S39 (T+H)
Electrical connection
● Make the electrical connection
according to the unit confi guration:
- NTC Probe S5a: B5 (connector
J3): with 2 x 1 mm
2
section cable,
within a maximum distance of 30
meters.
● Fasten the rear of the sensor case to the panel or the wall (for
fastening the case, use the screws supplied with the fastening
kit, paying attention to use the proper spacers, to not damage
the sensor’s electronics).
● This probe must be fastened to the panel or the wall of the
room to be conditioned, at ca. 1.5 m height.
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.