Troubleshooting Performance Issues; Table 44 - Troubleshooting Performance Issues - York YHAU-CW Manual

FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
TROUBLESHOOTING PERFORMANCE
ISSUES
If the performance is insufficient while the steam con-
trol valve is fully opened or if the steam control valve
does not fully open while the load is sufficient, check
numbers 1-7 in the following table in order. If the cause
of the malfunction is other than numbers 1-7, it may
be one of number 8-14. In this case, contact your local
Johnson Controls Service Center immediately.

TABLE 44 - TROUBLESHOOTING PERFORMANCE ISSUES

ITEM CAUSE
1 Cooling water temp. is high.
2 Cooling water flow rate is too low.
3 Cooling water heat exchange tube is dirty.
4 Non-condensable gas remains in machine.
Chilled water outlet temperature controller is
5
not set properly.
6 Manual refrigerant blow valves are kept open.
7 The Refrigerant Pump Stop button is pressed. Press the Refrigerant Pump Auto button.
8
Corrosion inhibitor is depleted.
9 Surface active agent is depleted.
10 Refrigerant is dirty (contains solution).
Chilled water outlet temperature controller is
12
broken.
11
Internal cycle control valve is not set properly.
13 Solution is crystallized.
14 Air leaks in absorption chiller.
JOHNSON CONTROLS
COUNTERMEASURE
Check the capacity of the cooling tower.
See if the cooling water supply rate matches the specification.
(Check the flow meter, discharge pressure of the cooling water
pump, current, and other relevant water gauges). If the flow rate is
insufficient, check the opening ratio of the flow controller valve and
check the strainer for clogging.
Contact your local Johnson Controls Service Office.
• See Purge Procedure on page 132 .
• Check the capacity of the vacuum pump.
• Check the purge unit for a problem.
• Purge air from the absorption chiller. If partial-load operation is
continued for a long period, non-condensable gas tends to stay
in the absorber. In this case, purge directly from the low-pressure
side (absorber), see Purge Procedure on page 132 . Even if the
automatic purge unit is installed, purge from the lower pressure
side (absorber) manually.
Be certain that each setting parameter of the chilled water outlet
temperature controller is set properly.
Check that manual refrigerant blow valve V8 is fully closed.
Contact your local Johnson Controls Service Office.
SECTION 8 – TROUBLESHOOTING
161
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