518676-BIM-C-0610
Johnson Controls Unitary Products
63
Figure 35: Basic Troubleshooting Flowchart
Figure 36: Power On Flow Chart
Monitor
Monitored
Systems
Problem?
Call for
Cooling?
Call for
Heating?
Call for
Heat
Yes
No
No
No
Call for 1st
Stage
Cooling
First
Stage?
Call for 2nd
Stage
Cooling
Yes
Yes
Loss of
Call for
Heating?
Loss of Call
for Cooling?
Heat Off
Cool Off
Yes
Yes
No
Call for
ID Blower?
Fan off
>10 secs?
Energize ID
Blower Motor
Yes
Yes
No
Programming?
Program
Unit
Control
Board
Trip/Failure
No
No
Lossof Call
for ID Blower?
Turn off ID
Blower Motor
Fan on
>30 secs?
Yes
No
Yes
No
No
Yes
Yes
No
Power to
Unit
Initialize ASCD
Call for
heat?
Voltage @
Gas Valve?
No
No
Energize ID
Blower
Yes
Yes
Montior