Carrier WeatherMaker 50KCQ A04 Series Service And Maintenance Instructions Download Page 31

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Fig. 47 — Remote Test/Reset Station Connections

Dirty Sensor Test Using an SD-TRK4 Test Set:

1. Turn the key switch to the RESET/TEST position for two

seconds.

2. Verify that the test/reset station’s Trouble LED flashes.

DETECTOR CLEANING

Cleaning the Smoke Detector:

Clean the duct smoke sensor when the Dirty LED is flashing

continuously or sooner if conditions warrant.

1. Disconnect power from the duct detector then remove the

sensor’s cover. See Fig. 48.

2. Using a vacuum cleaner, clean compressed air, or a soft

bristle brush, remove loose dirt and debris from inside the

sensor housing and cover. Use isopropyl alcohol and a

lint-free cloth to remove dirt and other contaminants from
the gasket on the sensor’s cover.

3. Squeeze the retainer clips on both sides of the optic hous-

ing then lift the housing away from the printed circuit
board.

4. Gently remove dirt and debris from around the optic plate

and inside the optic housing.

5. Replace the optic housing and sensor cover.

6. Connect power to the duct detector then perform a sensor

alarm test.

Fig. 48 — Sensor Cleaning Diagram

Indicators

NORMAL STATE
The smoke detector operates in the normal state in the absence

of any trouble conditions and when its sensing chamber is free

of smoke. In the normal state, the Power LED on both the sen-

sor 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:

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

turn on.

• The contacts on the controller’s two auxiliary relays switch

positions.

• The contacts on the controller’s alarm initiation relay

close.

• The controller’s remote alarm LED output is activated

(turned on).

• The controller’s high impedance multiple fan shutdown

control line is pulled to ground Trouble state.

The duct smoke detector enters the trouble state under the fol-

lowing conditions:

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

is properly secured.

• A sensor’s environmental compensation limit is reached

(100% dirty).

• A wiring fault between a sensor and the controller is detected.

An internal sensor fault is detected upon entering the trouble

state:
The contacts on the controller’s supervisory relay switch posi-

tions. See Fig. 49.

• If an error is sensed by the sensor, both the sensor’s Trou-

ble LED and the controller’s Trouble LED will turn on.

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

controller’s Trouble LED flashes continuously.

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

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

IMPORTANT:
OPERATIONAL TEST ALERT
Failure to follow this ALERT can result in an unnecessary

evacuation of the facility.
Holding the test magnet to the target area for longer than seven
seconds will put the detector into the alarm state and activate all

automatic alarm responses.

IMPORTANT:
OPERATIONAL TEST ALERT
Failure to follow this ALERT can result in an unnecessary
evacuation of the facility.
If the smoke detector is connected to a fire alarm system, first

notify the proper authorities that the detector is undergoing

maintenance, then disable the relevant circuit to avoid
generating a false alarm.

RESET/TEST

Trouble

POWER

ALARM

SUPERVISION RELAY
CONTACTS [3]

SD-TRK4

TB3

18 VDC (-)

AUXILIARY

EQUIPMENT