York YHAU-CE, Installation Operation & Maintenance, Page: 77 / 136

JOHNSON CONTROLS
77
SECTION 6 – OPERATION
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
6
BUTTON LABEL
(FAILURE NAME)
OPERATION
AT FAILURE
OCCURRENCE
CAUSE COUNTERMEASURES
Air Damper
Overcurrent
Stop after dilution
The air damper motor current exceeded
the rated value and the thermal relay
was activated.
Contact your local Johnson Controls
Service Center.
HG (XG) High Temp
HG (XG) solution temp rose too high or
to quickly.
Check the cooling water line.
Check the cooling water flow
Check the cooling tower performance.
Purge manually. See
Purge Procedure
on page 89.
HG (XG) Low Liquid
Level HG (XG) low liquid level was detected
during the exhaust gas input operation.
• Purge manually. See Purge
Procedure on page 89 .
• Contact your local Johnson Controls
Service Center.
High Waste Gas Inlet
Press. HG (XG) pressure rose to high or too
quickly.
Waste Gas Leak
Abnormal
The HG (XG) solution temperature
exceeded the setting value while the
engine operated. The temperature
continued to rise even after the unit
stopped.
Contact your local Johnson Controls
Service Center.
STOP the gas engine
immediately. A waste
exhaust gas leak failure
is very serious. If the gas
engine keeps running,
crystallization of the
solution in the unit or
damage or the HG (XG).
Waste Gas Damper
Failure
The HG (XG) solution temperature
exceeded the setting value while the
engine operated. The temperature
continued to rise even after the unit
stopped.
STOP the gas engine
immediately. A waste
exhaust gas leak failure
is very serious. If the gas
engine keeps running,
crystallization of the
solution in the unit or
damage or the HG (XG).
Control sensor
abnormal
The chilled / hot water outlet
temperature sensor, the refrigerant
temperature sensor, the cooling water
inlet temperature sensor, the HG
(XG) solution temperature sensor, the
HT-HEX solution outlet temperature
sensor, the engine waste exhaust gas
inlet temperature sensor, the engine
waste exhaust gas outlet temperature
sensor, or the HG (XG) pressure sensor
detected an abnormal reading due to
disconnection, a short circuit, or other
contributing factors.
• Tighten the terminal connections in
the control panel.
• Contact your local Johnson Controls
Service Center.
TABLE 16 - FAILURE LIST