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3-2
SM-16005-rev.2
TROUBLESHOOTING
Check the following items for any abnormalities in the activation of the system.
No.
Check Situation
Check Method
1 Is any power supply breaker or
fuse open?
Check the voltage (secondary side) of the breaker and also
check the continuity of the fuse with a tester.
2 Is the voltage at the secondary
side of the transformer correct?
Disconnect at the secondary side of the transformer and measure
voltage with a tester.
3
Is the wiring firmly secured and
correctly connected?
Check that the following wiring connections on O.U./I.U. printed circuit
boards (PCBs) are not loose.
• The connection for thermistors
• The connection for the wired controller cable
• The connection for communication cabling
• Each connection for power supply line
Check that the wiring connection on O.U./I.U. PCBs are not loose or
misconnected on the site according to the “Electrical Wiring Diagram” of
the Engineering Manual.
NOTE:
If the fuse(s) on an I.U. PCB is blown, diagnose the cause of overcurrent and replace the fuse(s).
In addition, check the power supply of optional parts because the fuse may blow out by the power supply
failure. Turn off power for safety.
3.1 Initial Troubleshooting
3.1.1 Checking Electrical Wiring and Power Supply
Summary of Contents for IDM030B21E Series
Page 2: ......
Page 10: ...viii SM 16005 rev 2...
Page 14: ......
Page 15: ...SM 16005 rev 2 1 1 INSTALLATION 1 Installation...
Page 19: ...SM 16005 rev 2 2 1 OPERATION 2 Operation...
Page 22: ......
Page 23: ...SM 16005 rev 2 3 1 TROUBLESHOOTING 3 Troubleshooting...
Page 70: ......
Page 71: ...SM 16005 rev 2 4 1 MAINTENANCE 4 Maintenance...
Page 130: ......
Page 131: ...SM 16005 rev 2 6 1 FIELD WORK INSTRUCTIONS 6 Field Work Instructions...
Page 140: ...6 10 SM 16005 rev 2 FIELD WORK INSTRUCTIONS 6 8 Mollier Chart for R410A f t 3 l b...
Page 141: ...SERVICE PARTS LIST SM 16005 rev 2 7 1 7 Service Parts List...
Page 143: ......
Page 144: ...2016 Johnson Controls Inc SM 16005 rev 2 Code No LIT 12012293 Revised February 2019...