Carrier 50TC*17 Series Service And Maintenance Instructions

35Table 7 – Detector IndicatorsCONTROL OR INDICATOR DESCRIPTIONMagnetic test/reset switch Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is inthe normal state.Alarm LED Indicates the sensor is in the alarm state.Trouble LED Indicates the sensor is in the trouble state.Dirty LED Indicates the amount of environmental compensation used by the sensor(flashing continuously = 100%)Power LED Indicates the sensor is energized.Resetting Alarm and Trouble Condition Trips:Manual reset is required to restore smoke detector systemsto Normal operation. For installations using two sensors,the duct smoke detector does not differentiate whichsensor signals an alarm or trouble condition. Check eachsensor for Alarm or Trouble status. Clear the conditionthat has generated the trip at this sensor. Then reset thesensor by pressing and holding the reset button (on theside) for 2 seconds. Verify that the sensor’s Alarm andTrouble LEDs are now off. At the controller, clear itsAlarm or Trouble state by pressing and holding themanual reset button (on the front cover) for 2 seconds.Verify that the controller’s Alarm and Trouble LEDs arenow off. Replace all panels.TroubleshootingController’s Trouble LED is On1. Check the Trouble LED on each sensor connected tothe controller. If a sensor’s Trouble LED is on, deter-mine the cause and make the necessary repairs.2. Check the wiring between the sensor and the con-troller. If wiring is loose or missing, repair or replaceas required.Controller’s Trouble LED is Flashing1. One or both of the sensors is 100% dirty.2. Determine which Dirty LED is flashing then cleanthat sensor assembly as described in the detectorcleaning section.Sensor’s Trouble LED is On1. Check the sensor’s Dirty LED. If it is flashing, thesensor 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.Sensor’s Power LED is Off1. Check the controller’s Power LED. If it is off, deter-mine why the controller does not have power andmake the necessary repairs.2. Check the wiring between the sensor and the con-troller. If wiring is loose or missing, repair or replaceas required.Controller’s Power LED is Off1. Make sure the circuit supplying power to the con-troller is operational. If not, make sure JP2 and JP3are set correctly on the controller before applyingpower.2. Verify that power is applied to the controller’s supplyinput terminals. If power is not present, replace or re-pair wiring as required.Remote Test/Reset Station’s Trouble LED DoesNot flash When Performing a Dirty Test, but theController’s Trouble LED Does1. Verify that the remote test/station is wired as shownin Fig. 40. Repair or replace loose or missing wiring.2. Configure the sensor dirty test to activate the con-troller’s supervision relay. See “Changing SensorDirty Test Operation.”Sensor’s Trouble LED is On, But the Controller’sTrouble LED is OFFRemove JP1 on the controller.PROTECTIVE DEVICESCompressor ProtectionOvercurrentThe compressor has internal linebreak motor protection.Reset is automatic after compressor motor has cooled.OvertemperatureEach compressor has an internal protector to protect itagainst excessively high discharge gas temperatures. Resetis automatic.High Pressure SwitchThe system is provided with a high pressure switchmounted on the discharge line. The switch isstem−mounted and brazed into the discharge tube. Tripsetting is 630 psig ± 10 psig (4344 ± 69 kPa) when hot.Reset is automatic at 505 psig (3482 kPa).