Carrier 48TCA04---A12 User Manual

Page 41

unit shutdown through its NC contact set connected to the

unit’s LCTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The PremierLink

communicates the smoke detector’s tripped status to the

CCN building control. See Fig. 23 for unit smoke detector

wiring.

Alarm state is reset when the smoke detector alarm

condition is cleared and reset at the smoke detector in the

unit.

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

LCTB’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. 54.

TB1

LCTB
Thermostat

J4-4

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

C08216

Fig. 54 -- 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--58SI 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

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

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. 55.

TB1

LCTB
Thermostat

J4-6

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

C08118

Fig. 55 -- 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

TB1

LCTB
Thermostat

Time Clock

Remote Occupied

C08214

Fig. 56 -- 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. 57.

Power Exhaust

J8-3

TB1

THERMOSTAT

PEC

TAN

GRA

LCTB

C08120

Fig. 57 -- PremierLink Power Exhaust Output

Connection

Space Relative Humidity Sensor — The RH sensor is not

used with 48TC 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.

48TC