York YHAU-CW - Troubleshooting Sequence Flow Chart

JOHNSON CONTROLS
165
SECTION 8 – TROUBLESHOOTING
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
8
Emergency stop
Audible alarm
(buzzer) “ON”
Chilled
Water/ Refrigerant
overcooling
Dilution Finish
Failure indicator
light “ON”
• Chilled water time out
• Cooling water time out
• Chilled water suspension
• Chilled water overcooled
• Refrigerant overcooled
• Solution circulation pump abnormal
• Solution spray pump abnormal
• Refrigerant pump abnormal
• Solution pump inverter abnormal
1
1
Yes
Yes
No
No
No
Yes
Reset operation
(buzzer “OFF”)
External outlet
issues
No
Yes
Dilution time up
Yes
Stop with dilution
operation
Steam control valve or steam
drain control valve, steam drain
solenoid valve and steam shut
off valve (option)
close
Dilution time increasing
Solution/Refrigerant
Pump stop
Dilution time stops
increasing
Solution/Refrigerant
Pump continue
Solution pump and
refrigerant pump stop
Chilled water/Cooling
water pump stop
HG.
pressure low
A/H, FCU, stop
Dilution
operation more than
30 minutes.
No
Dilution time count
• Operation interlock
• Cooling water pump interlock
• Low cooling water inlet temp.
- Control sensor abnormal
• CPU abnormal
• HG High temperature
• HG High pressure
• Constantly monitoring interlock
• High cut
FIGURE 61 - TROUBLESHOOTING SEQUENCE FLOW CHART