A C-TRAC2.1 MANUAL
Page ix March 1999 R1
AIR CONDITIONING (Air Cooled Condenser)
The following is a flowchart covering many general operating/troubleshooting situations.
If a more detailed manual is needed, contact the nearest EngA factory.
Is supply fan (and optional return fan)
operating?
YES NO
Is there a call for cooling by the
control system?
YES NO
Refer to wiring diagram for fan
safety controls
Refer to wiring diagram for safety
devices that may stop control
initiating cooling call.
Is call for free cooling by control system?
YES NO
Is call for mechanical cooling by
control system?
YES NO
Refer to wiring diagram for fan
safety controls
Are dampers modulating?
YES NO
Refer to wiring diagram for
damper motor control
Will outside ambient control allow
mechanical cooling to run?
YES NO
Is first stage cooling contract closed?
YES NO
If outdoor temperature is adequate to
allow mechanical cooling to operate
readjust O/A control or replace if
faulty.
Is a condenser fan running? (In
most cases, on should be)
YES NO
If cooling is called by control and is not running, control
system would be suspect. Jumper output contact and follow
“yes” answer from the previous box.
If normal wiring check constant run
condenser fan contactor or motor.
Is 1
s
stage compressor running?
NO YES
If being called for, has 2
n
stage
cooling contact closed?
YES NO
Is 2
n
stage cooling running? (Note:
2
nd
stage may start a compressor or
“load” a partially loaded compressor).
YES NO
For 3
r
, 4
stages, etc., repeat at the
boxes.
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