Section 8 - Troubleshooting - York YHAU-CW Manual

FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
If the chiller malfunctions or an abnormal condition
is detected while it operates, locate the cause. Use the
procedures listed below to fix the problem.
If the cause is not clear, using the countermeasure will
not repair the problem, or if the chiller seems to have a
serious malfunction, contact your local Johnson Con-
trols Service Center immediately.
If the chiller stops because of a problem, wait until the
chilled water pump, cooling water pump, and chiller
unit stop completely, then verify the following items.
Causes of lighting of trouble indicator lamps on con-
trol panel of absorption chiller and countermeasures
against them.
Several items should be checked routinely whenever
the chiller experiences any trouble or abnormality.
• Check to see if the main steam valve was closed
by mistake.
• Open the main valve.
Check the causes in order. Any of these
causes will state the diluting operation
automatically then stop the chiller. Check
that the diluting operation was completed,
and if not, dilute the solution according to
the Manual Refrigerant Blow Down and
Diluting Method on page 137.
JOHNSON CONTROLS
SECTION 8 – TROUBLESHOOTING
• See if the valves of the chilled water system
and cooling water system are set correctly.
Verify the flow rate.
• See if the cooling tower is operating nor-
mally.
• Check the valves and pumps of the cooling
water system. Verify the flow rate.
Contact your local Johnson Controls Service
Center if any of the following apply:
• The water flow rate setting is unknown.
• It takes 30 minutes or more to restore op-
erations.
• Solution is crystallized.
• The cause of the trouble is not readily ap-
parent.
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