50Fc" Electronic Control - Carrier 50NC Series Installation, Operation And Maintenance Instructions

8 - ELECTRICAL CONNECTION
Dual locks can function as hinges or can be used
to remove the door. Check that the locks are not
blocked. Open them with a 4 mm Allen wrench (in
an anti-clockwise direction).
The graphic terminal and the ground connector, both located on
the door, must be disconnected before removing it.
The grounding lug (PE), located on the panel plate,
is used to earth the frame of the unit.
Electrical components are identifi ed, and all wires are numbered.
It permits easy tracing and diagnostics.
Power cables are identifi ed with the colors: black (L1) - Brown
(L2) - grey (L3) - yellow/green (Ground).
Power cable access routing
The power supply cables can be routed into the electrical cabinet
via the wall bushings. It is important to check that the power cable
bend radius is compatible with the connection space available
inside the electrical cabinet.
Indoor module
The indoor module incorporates an auxiliary electrical cabinet
for the connection of the indoor fan and some optional elements,
such as a clogged fi lter detector, smoke detection station, etc.
The access panel is secured with M6 Allen screws.
Always ensure that the main power to the outdoor
module is turned off before working on the indoor
module.
This cabinet is foldable to allow access to the interior of the
module. It is fi xed with M4 Allen screws.
18

8.5 "50FC" electronic control

"50FC" electronic control is basically comprised of a control
board, a graphic terminal, an user terminal (optional) and
sensors.
By default, this control is supplied with a graphic terminal,
installed on the unit's electric cabinet, but it can also be remotely
connected:
● Up to 50 meters, it can be connected directly with telephone
wire.
● From 50 to 200 meters, it is necessary to use the TCONN
bypass cards and AWG 20/22 shielded cable with 2 twisted
pairs.
The user terminal (optional) can be installed in the electric
cabinet when the graphic terminal is remotely connected.
This board integrates two communication ports that allow
connection with a centralized technical management system
such as BOSS and BOSS mini. A BMS port for Modbus RTU
protocol and an Ethernet port for Modbus TCP/IP protocol.
A communication card (optional) can also be connected to the
control board for the following protocols: Ethernet BACnet
MSTP BACnet
Note: Refer to the "50FC" control brochure to obtain more
detailed information on its operation.
Location of sensors controlled by "50FC" control on the unit:
Units of 2 circuits
Electrical
cabinet
Cable inputs from
the outdoor module
(heat pump)
High press.
pressostat
Note: If the unit needs the outdoor humidity probe, used with enthalpic or
thermoenthalpic free-cooling, this one (S39) will be connected in the place of
Cabinet fi xing
the ambient probe (S5a). In this case it is necessary to use a RS485 ambient
screws
temperature probe connected on the Field-bus.
Graphic terminal
and Konnex.
TM
S40
Outdoor T probe (duct)
S39
Outdoor T+H probe (duct)
Outdoor fan
S3
Supply
air probe
Outdoor coil
Expansion
valve
Indoor fans
Indoor coil
CIRCUIT 1
S4
Mixing
probe
4-way
valve
S7 S8
High Suction
pressure temp. Return
air
transducer probe
S1
Return
air probe
S6
S5a
Compr.
Low Ambient
pressure air probe
transducer
S10
Air quality
Discharge T
probe (opt.)
klixon switch
User terminal
TM
Outdoor fan
Outdoor coil
Expansion
valve
Indoor coil
Fresh
air
CIRCUIT 2
4-way
valve
(heat pump)
S9 S12
Suction High
temp. pressure
probe transducer
S11
Compr.
Low
pressure
transducer
Discharge T High press.
klixon switch pressostat
,