Carrier 50TCQA - page 24

On 50TCQ units equipped with factory--installed Smoke

Detector(s), the smoke detectorcontroller implements the

unit shutdown through its NC contact set connected to the

unit’s CTB 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. 30, the PremierLink

wiringschematic.

Filter Status Switch — This function is available only

when PremierLinkis configured for (Space) Sensor Mode.

PremierLinkcontrol can monitor return filter status in two

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

pressure switchor 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 forDirty Filter is set

at the switch.See Fig. 42.

TB1

J4-4

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

CTB

Thermostat

C08216

Fig. 42 --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 causesthe 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 a

field--supplied/installed differential pressure switch. This

sequence will prevent (or interrupt) operation of uni t

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 theswitch. See Fig. 43.

TB1

J4-6

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

CTB

Thermostat

C08118

Fig. 43 --PremierLink Wiring Fan PressureSwitch

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 functionsafter 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

sideof the timeclock contact to the unit’s TB1--2terminal.

TB1 PL

Time Clock

Remote Occupied CTB

Thermostat

J4-12

C08214

Fig. 44 --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. 45.

Space Relative Humidity Sensor — The RH sensor is not

used with50TCQ models at this time.

J8-3

TB1 PL

PEC TAN

GRA

Power Exhaust

CTB

THERMOSTAT

C08120

Fig. 45 --P remierLink Power Exhaust Output

Connection

CCN Communication Bus — The PremierLink controller

connects to the bus in a daisy chain arrange ment.

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--pinplug.

50TCQA