Location Of Sensors On The Machine; Sensors Connection By The Costumer - Carrier 50FF/FC 020-093 Installation, Operation And Maintenance Instructions

8 - ELECTRICAL CONNECTION

8.6 - Location of sensors on the machine

Unit 1 circuit
S2
Outdoor fan
Outdoor coil Electronic
expansion
4-way valve
(heat pump)
S7 (*)
High pressure
transducer
Compressor
High press. Discharge T
pressostat klixon switch
(*) In units with 2 circuits:
• Low pressure transducers: S6 (circ.1) and S11 (circ.2)
• High pressure transducers: S7 (circ.1) and S12 (circ.2
• Suction temperature probes: S8 (circ.1) and S9 (circ.2)
Note: If the unit needs the outdoor humidity probe, used with
enthalpic or thermoenthalpic management of the economizer,
this one (S5h) will be connected in the place of the ambient
probe (S5a). In this case it is necessary to use a RS485 ambient
temperature probe connected on the Field-bus.

8.7 - Sensors connection by the costumer

The client must connect on-site the following probes:
■ Ambient NTC (standard) or RS485 (optional).
■ Air quality (optional).
■ Outdoor humidity (optional).
These probes are supplied inside the electrical cabinet.
Please refer to the wiring diagram and the "50FC" control
brochure, both provided with the unit.
8.7.1 - Connection of the ambient probe
■ To do this, the following steps are recommended:
- Open the case using a fl athead screwdriver in the slot, paying
extra care not to damage the electronic parts.
28
Outdoor temperature probe
S3
Supply air probe
valve
Indoor fan
Indoor coil
Fresh air
S4
Mixing
probe
Air extraction
S1
S8 (*)
Return air probe
Suction
temperature
probe
S5a
Ambient air probe
S6 (*)
S10
Low pressure
Air quality probe
transducer
(opt.)
- 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.
■ 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.
• Dual 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.
8.7.2 - Connection of the outdoor humidity probe
(optional)
■ The outdoor humidity probe (optional), necessary for the
enthalpic and thermo-enthalpic management of the economizer,
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)
No1
+(G) (G0) Tx Rx- Tx Rx+ GND
RS485
network
110 111 112 113 114
24Vac
Electric
panel
B10
(fi g.2)
(fi g.4)