Johnson Controls York YHAU-C User Manual

Troubleshooting performance issues
If the performance is insufficient while the steam condensate control valve is fully opened, or if the
steam condensate control valve does not fully open while the load is sufficient, follow numbers 1-7
in the following table. If the cause of the trouble is something other than numbers 1-7, it can be one
of number 8-14. In this case, contact your local Johnson Controls Service Center immediately.
Table 43: Troubleshooting performance issues
Item Cause Countermeasure
1 Cooling water temperature is high. Check the capacity of the cooling tower.
2 Cooling water is insufficient.
• Check if the cooling water supply rate matches the
specification.
• Check the flow meter, discharge pressure of the cooling water
pump, current, and so on.
• If the flow rate is insufficient, check the opening ratio of the
flow controller valve and check the strainer for clogging.
3 Cooling water heat exchange tube is dirty. Contact your local Johnson Controls Service Office.
4 Non-condensable gas remains in machine.
• Check Purge procedure.
• Check the capacity of the vacuum pump.
• Check the purge unit for trouble.
• 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. Even if
the automatic purge unit is installed, purge from the lower
pressure side (absorber) manually.
5
Chilled water outlet temperature controller
is not set correctly.
Check that the chilled water outlet temperature controller on the
control panel by the machine is set to the target value.
6
Manual refrigerant blow valves are kept
open.
Check that manual refrigerant blow valve V8 is closed.
7 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).
11
Internal cycle control valve is not set
correctly.
12
Chilled water outlet temperature controller
is broken.
13 Solution is crystallized.
14 Air leaks in absorption chiller.
Contact your local Johnson Controls Service Office.
YHAU-C Single Effect Steam-Fired Absorption Chiller172

Johnson Controls York YHAU-C Specifications

General

Brand	Johnson Controls
Model	York YHAU-C
Category	Chiller
Language	English