Carrier 48/50PG20-28 - Manual (Page 10)

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To perform a controller alarm test:
1. Press the controller’s test/reset switch for seven seconds.
Verify that the controller’s Alarm LED turns on.
2. After performing a controller alarm test, reset the sensor
by pressing the test/reset switch for two seconds. Verify
that the controller’s Alarm LED turns off.
Controller Dirty Test
The controller dirty test checks the controller’s ability to initiate a
sensor dirty test and indicate its results.
To perform a sensor dirty test, press the controller’s test/reset
switch for two seconds. Verify that the controller’s Trouble LED
flashes.
TROUBLESHOOTING
Dirty LED
Sensor’s Dirty LED is Flashing
Clean the sensor assembly as described in Cleaning Procedure.
Power LED
Sensor’s Power LED is OFF
1. Check the controller’s Power LED. If it is off, determine
why the controller does not have power and make the
necessary repairs.
2. Check the wiring between the sensor and the controller. If
wiring is loose or missing, repair or replace as required.
Controller’s Power LED is OFF
1. Make sure the circuit supplying power to the controller is
operational. If not, make sure JP2 and JP3 are set correctly
on the controller before applying power.
2. Verify that power is applied to the controller’s supply in-
put terminals. If power is not present, replace or repair wir-
ing as required.
Trouble LED
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, determine the
cause and make the necessary repairs.
2. Check the wiring between the sensor and the controller. 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. Determine which
sensor’s Dirty LED is flashing.
2. Clean the sensor assembly as described in Cleaning
Procedure.
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, secure
the cover to the sensor housing.
3. Replace sensor assembly.
Sensor’s Trouble LED is On But Controller’s Trouble LED is
Off
Remove JP1 on the controller.
Copyright 2007 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:48/50H,P---24SI
Replaces:48/50H,P--- 10SI
Printed in U.S.A. Edition Date:7/07
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