Figure 4.12 Alarm Troubleshooting Sequence - Carrier 69NT40-541-505 Operation And Service Manual

Troubleshooting
fans start?
inspection?
T-368
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Figure 4.12 Alarm Troubleshooting Sequence

Start
No
Unit does
self test?
Yes
Did
No
Evaporator
Yes
Correct
No
software
version?
Yes
Unit
No
configured
correctly?
Yes
Active Yes
Alarms?
No
Pass
No
Pre trip
Yes
No
Operating
pressures
normal?
Yes
Unit OK
search engine
Check Power Refer to CONNECT POWER
Supply
Section 4.2
Refer to CONNECT POWER
Check Power
Supply
Section 4.2
Install Latest
Refer to CONTROLLER SOFTWARE
Software
Section 3.2
Revision
Load correct
Refer to Configuration Software
unit
(CnF Variables), refer to Table 3-4
configuration
See alarm
Refer to Controller Alarm Indications
details &
repair
Table 3-6
Refer to Pre trip Diagnostics
Correct
all faults Section 3.7
Refer to Refrigeration System
Correct
Refrigerant
Service Sections 6.2
issue
4–30
6.7