Carrier WeatherMaster 50HC14 Installation Instructions Manual page 51

other side of the NO contact set to TB3-10. Setpoint for Dirty
Filter is set at the switch. See Fig. 74.
Filter Switch (NO, close on rising pressure (high drop))
Fig. 74 — PremierLink Controller Filter Switch
Connection
When the filter switch's NO contact set closes as filter
pressure drop increases (indicating dirt-laden filters), the in-
put signal to the PremierLink controller causes the filter sta-
tus point to read "DIRTY."
Using Filter Timer Hours
Refer to the PremierLink Controller Installation, Start-up,
and Configuration Instructions for instructions on using the Pre-
mierLink Configuration screens and on unit alarm sequence.
SUPPLY FAN STATUS SWITCH
The PremierLink controller can monitor supply fan opera-
tion through a field-supplied and field-installed differential
pressure switch. This sequence will prevent (or interrupt) op-
eration of unit cooling, heating and economizer functions un-
til 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. Ar-
range 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 CTB's
THERMOSTAT-R terminal. Connect the other side of the NO
contact set to TB3-8. Setpoint for Supply Fan Status is set at
the switch. See Fig. 75.
Fan (Pressure) Switch (NO, close on rise in pressure)
Fig. 75 — PremierLink Controller Wiring Fan
Pressure Switch Connection
REMOTE OCCUPIED SWITCH
The PremierLink controller 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 to 20 minute delay.
Connect one side of the NO contact set on the timeclock to
CTB's THERMOSTAT-R terminal. Connect the other side of
the timeclock contact to the unit's TB3-2 terminal (see
Fig. 76).
Remote Occupied
Time Clock
Fig. 76 — PremierLink Controller Wiring Remote
Occupied
CTB
Thermostat
R
TB3 PL
10 J4-4
CTB
Thermostat
R
TB3 PL
J4-6
8
LCTB
Thermostat
R
TB3
PL
2 J4-12
Refer to the PremierLink™ Controller Installation, Start-
up, and Configuration Instructions for additional information
on configuring the PremierLink controller for Door Switch
timer function.
POWER EXHAUST (OUTPUT)
Connect the accessory Power Exhaust contactor coil(s) per
Fig. 77.
Power Exhaust
PEC GRA
TAN
Fig. 77 — PremierLink Controller Power Exhaust
Output Connection
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, posi-
tive 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 baud.
Communications 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 net-
work.
See Table 23 for recommended cable.
Table 23 — Recommended Cables
MANUFACTURER
Alpha
American
Belden
Columbia
NOTE: Conductors and drain wire must be at least 20 AWG,
stranded, and tinned copper. Individual conductors must be insu-
lated with PVC, PVC/nylon, vinyl, Teflon
aluminum/polyester 100% foil shield and an outer jacket of
PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum op-
erating 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 communi-
cation 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
1. Teflon is a registered trademark of DuPont.
51
TB3 PL
J8-3
15
CTB
THERMOSTAT
C
CABLE PART NO.
2413 or 5463
A22503
8772
02525
1 , or polyethylene. An