Carrier 50TCQD Specifications download pdf (Page 34)

6. Connect power to the duct detector then perform a

sensor alarm test.

IRFLOW

HVAC DUCT

SAMPLING

TUBE

RETAINER

CLIP

OPTIC

PLATE

OPTIC

HOUSING

SENSOR

HOUSING

C07305

Fig. 47 -- Sensor Cle aning Diagram

Indicators

Normal State:

The smoke de tector operate s in the normal state in the

absence of any trouble conditions and when its sensing

chamber is free of smoke. In the norma l state, the Power

LED on both the sensor and the controller are on and all

other LEDs are off.

Alarm State:

The smoke detector enters the alarm state when the

amount of smoke particulate in the sensor’s sensing

chamber exceeds the alarm threshold value. See Table 11.

Upon entering the alarm state:

S The sensor’s Alarm LED and the controller’s Alarm

LED turn on.

S The contacts on the controller ’s two auxiliary relays

switch positions.

S The contacts on the controller ’s alarm initiation relay

close.

S The control ler’s remote alarm LED output is activated

(turned on).

S The controller’s high impedance multiple fan shutdown

control line is pulled to ground Trouble state.

The SuperDuct duct smoke detector enters the trouble

state under the following conditions:

S A sensor’s cover is removed and 20 minutes pass before

it is properly sec ured.

S A sensor’s environmental compensation limit is reached

(100% dirty).

S A wiring fault between a sensor and the controller is

detected.

An i nternal sensor fa ult is det ected upon entering the

trouble state:

S The conta cts on the controller’s supervisory relay

switch positions. See Fig. 48.

S If a sensor trouble, the sensor’s Trouble LED and the

controller’s Trouble LED turn on.

S If 100% dirty, the sensor’s Dirty LED turns on and the

controller’s Trouble LED flashes continuously.

S If a wiring fault between a sensor and the controller, the

controller’s Trouble LED turns on but not the sensor’s.

Alarm

Power

Test/reset

switch

Trouble

C07298

Fig. 48 -- Controller Assembly

NOTE: All troubles a re latche d by the duct smoke

detector. The trouble condition must be cleared and then

the duct smoke detector must be reset in order to restore it

to the normal state.

Resetting Alarm and Trouble Condition Trips

Manual reset is required to restore smoke detector systems

to Normal opera tion. For instal lations using two sensors,

the duc t smoke detect or does not differentiate whic h

sensor signals an alarm or trouble condition. Check each

sensor for Alarm or Trouble status as indicated by the

LEDs. Clear the condition that has generated the trip at

this sensor. Then reset the sensor by pressing and holding

the reset button, on the side, for 2 seconds. Verify that the

sensor’s Alarm and Trouble LEDs are now off. At the

controller, clea r its Alarm or Trouble state by pressing and

holding the manua l reset button, located on the front

cover, for 2 seconds. Verify that the controller’s Alarm

and Trouble LEDs are now off. Replace all panels.

Troubleshooting

Controller’s Trouble LED is On:

1. Check the Trouble LED on each sensor connected to

the controller. If a sensor’s Trouble LED is on, de-

termine the cause and make the necessary repairs.

2. Check the wiring between the sensor and the control-

ler. If wiring is loose or missing, repair or replace as

required.

Controller’s Trouble LED is Flashing:

1. One or both of the sensors is 100% dirty.

2. Determine which Dirty LED is flashing then clean

that sensor assembly as describe d in the dete ctor

cleaning section.

Sensor’ s Trouble LED is On:

1. Check the sensor’s Dirty LED. If it is flashing, the

sensor is dirty and must be cleaned.

2. Check the sensor’s cover. If it is loose or missing, se-

cure the cover to the sensor housing.

3. Replace sensor assembly.

50TCQ

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Carrier 50TCQD Specifications Page 34

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