Carrier 48TC Instruction Manual download pdf (Page 28)

Filter Status Switch —

This function is available only when PremierLink is

configured for (Space) Sensor Mode.

PremierLink control can monitor return filter status in two

ways: By monitoring a field--supplied/installed filter

pressure switch or via supply fan runtime hours.

Using switch input: Install the dirty filter pressure switch

according to switch manufacturer’s instructions, to

measure pressure drop across the unit’s return filters.

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 TB1--10. Setpoint for Dirty Filter is set

at the switch. See Fig. 50.

TB1

J4-4

Filter Switch (NO, close on rising pressure (high drop))

CTB

Thermostat

C08216

Fig. 50 -- PremierLink Filter Switch Connection

When the filter switch’s NO contact set closes as filter

pressure drop increases (indicating dirt--laden filters), the

input signal to PremierLink causes the filter status point to

read “DIRTY”.

Using Filter Timer Hours: Refer to Form 33CS--68SI for

instructions on using the PremierLink Configuration

screens and on unit alarm sequence.

Supply Fan Status Switch —

The PremierLink control can monitor supply fan operation

through a field--supplied/installed differential pressure

switch. This 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 CTB’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. 51.

TB1

J4-6

Fan (Pressure) Switch (NO, close on rise in pressure)

CTB

Thermostat

C08118

Fig. 51 -- 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 CTB’s THERMOSTAT--R terminal. Connect the other

side of the timeclock contact to the unit’s TB1--2 terminal

(see Fig. 52).

TB1

Time Clock

Remote Occupied

CTB

Thermostat

J4-12

C08214

Fig. 52 -- PremierLink Wiring Remote Occupied

Refer to Form 33CS--68SI 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. 53.

J8-3

TB1

PEC

TAN

GRA

Power Exhaust

CTB

THERMOSTAT

C08120

Fig. 53 -- PremierLink Power Exhaust Output

Connection

NOTE: The Power Exhaust and Humidi--MiZer

options

can not be used with PremierLink at the same time as both

options require connection at TB1--15 (AUX OUT).

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.

48TC

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Carrier 48TC Instruction Manual Page 28

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