Carrier 50TCA04-A07 - Manual (Page 31)

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sequence will prevent (or interrupt) operation of unit
cooling, heating and economizer functions until the
pressure switch contacts are closed indicating proper
supply fan operation.
Install the differential pressure switch in the supply fan
section according to switch manufacturer’s instructions.
Arrange the switch contact to be open on no flow and to
close as pressure rises indicating fan operation.
Connect one side of the switch’s NO contact set to
LCTB’s THERMOSTAT--R terminal. Connect the other
side of the NO contact set to TB1--8. Setpoint for Supply
Fan Status is set at the switch. See Fig. 48
R
8
TB1
LCTB
Thermostat
J4-6
PL
Fan (Pressure) Switch (NO, close on rise in pressure)
C08118
Fig. 48 -- PremierLink Wiring Fan Pressure Switch
Connection
Remote Occupied Switch — The PremierLink control
permits a remote timeclock to override the control’s
on--board occupancy schedule and place the unit into
Occupied mode. This function may also provide a “Door
Switch” time delay function that will terminate cooling
and heating functions after a 2--20 minute delay.
Connect one side of the NO contact set on the timeclock
to LCTB’s THERMOSTAT--R terminal. Connect the other
side of the timeclock contact to the unit’s TB1--2 terminal.
J4-12
R
2
TB1
LCTB
Thermostat
PL Time Clock
Remote Occupied
C08214
Fig. 49 -- PremierLink Wiring Remote Occupied
Refer to Form 33CS--58SI for additional information on
configuring the PremierLink control for Door Switch
timer function.
Power Exhaust (output) -- Connect the accessory Power
Exhaust contactor coils(s) per Fig. 50.
Power Exhaust
J8-3 15
C
TB1
THERMOSTAT
PL
PEC TAN
GRA
LCTB
C08120
Fig. 50 -- PremierLink Power Exhaust Output
Connection
Space Relative Humidity Sensor — The RH sensor is not
used with 50TC models at this time.
CCN Communication Bus — The PremierLink controller
connects to the bus in a daisy chain arrangement.
Negative pins on each component must be connected to
respective negative pins, and likewise, positive pins on
each component must be connected to respective positive
pins. The controller signal pins must be wired to the signal
ground pins. Wiring connections for CCN must be made
at the 3--pin plug.
At any baud (9600, 19200, 38400 baud), the number of
controllers is limited to 239 devices maximum. Bus length
may not exceed 4000 ft, with no more than 60 total
devices on any 1000--ft section. Optically isolated RS--485
repeaters are required every 1000 ft.
NOTE: Carrier device default is 9600 band.
COMMUNICATION BUS WIRE SPECIFICATIONS —
The CCN Communication Bus wiring is field--supplied
and field--installed. It consists of shielded 3--conductor
cable with drain (ground) wire. The cable selected must
be identical to the CCN Communication Bus wire used for
the entire network.
See Table 9 for recommended cable.
Table 9 – Recommended Cables
MANUFACTURER CABLE PART NO.
Alpha 2413 or 5463
American A22503
Belden 8772
Columbia 02525
NOTE: Conductors and drain wire must be at least 20
AWG, stranded, and tinned copper. Individual conductors
must be insulated with PVC, PVC/nylon, vinyl, Teflon, or
polyethylene. An aluminum/polyester 100% foil shield
and an outer jacket of PVC, PVC/nylon, chrome vinyl, or
Teflon with a minimum operating temperature range of
--20 C to 60 C is required. Do not run communication wire
in the same conduit as or next to any AC voltage wiring.
The communication bus shields must be tied together at
each system element. If the communication bus is entirely
within one building, the resulting continuous shield must
be connected to ground at only one single point. If the
communication bus cable exits from one building and
enters another building, the shields must be connected to
the grounds at a lightning suppressor in each building (one
point only).
Connecting CCN bus:
NOTE: When connecting the communication bus cable,
a color code system for the entire network is
recommended to simplify installation and checkout. See
Table 10 for the recommended color code.
Table 10 – Color Code Recommendations
SIGNAL TYPE
CCN BUS WIRE
COLOR
CCN PLUG PIN
NUMBER
+ Red 1
Ground White 2
--- Black 3
Connect the CCN (+) lead (typically RED) to the unit’s
TB1--12 terminal. Connect the CCN (ground) lead
50TC