Basic Troubleshooting Flowchart; Power On Flow Chart - York ZJ078 Installation Manual

Monitor
Figure 37: Basic Troubleshooting Flowchart
Figure 38: Power On Flow Chart
Johnson Controls Unitary Products
Monitored
No
Systems Programming?
Problem?
Yes
Program
Unit
Trip/Failure
Control
Board
No
Yes
Turn off ID Fan on
Blower Motor >30 secs?
Yes
No
Lossof Call
for ID Blower?
Power to
Unit
Initialize ASCD
No
No
Call for
Heating?
Yes
Yes
Call for
Heat
Energize ID
Blower Motor
Yes
No
Fan off
>10 secs?
Yes
No
Call for
ID Blower?
Yes
Call for
heat?
No
Montior
Loss of
Yes
Call for
Heat Off
Heating?
No
Call for 2nd
Stage
Cooling
Yes
Call for First
Cooling? Stage?
No
Call for 1st
Stage
Cooling
No
Yes
Loss of Call
Cool Off
for Cooling?
Yes
Voltage @
Gas Valve?
No
Energize ID
Blower
524581-YIM-I-0512
No
Yes
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