14. Set the valve position setting at 30 - 40%. See Change numeric values for more information on
how to change the settings.
15. Watch the liquid level in the absorber.
16. When the liquid level in the absorber drops, press the Forced Dilution OFF button.
17. Repeat steps 12 through 16 three or four times. If the liquid level in the absorber does not go
down, the crystals have melted.
18. Let the solution pump operate independently for about 30 minutes. Constantly observe the
liquid level in the absorber while the solution pump operates.
19. After about 30 minutes, stop the solution pump.
20. Press the Refrigerant Pump Auto button.
21. Return the valve cap. There is an O-ring between the cap and valve. When fitting the cap, make
sure that the O-ring is set normally.
Precautions for de-crystallization
• Cycle the chilled and cooling water pumps off and on during the melting process.
• Remove any sensors that are sensitive to heat before you start the melting operation. The
temperature of the chilled and cooling water that remains in the absorption chiller can rise to
about 158°F.
• When you start the chiller after melting the crystals, discharge the chilled water and cooling
water first. If that water is left in the machine, the paint on the inside walls can be peeled off.
Maintenance items
Maintenance and inspection items along with standard inspection periods are shown in the next
table. For details, contact your local Johnson Controls Service Center.
Inspection frequency can be adjusted according to the actual operating conditions.
Table 27: Maintenance and inspection
Task Contents Frequency Scope
Recording of operation data
Collect the operation data (Refer to 155.34-CL2) and
check the data with the data collected during the
factory test.
1 weekly C
Check of liquid level See Table 45. Check the liquid level at each part. Daily C
Check the steam condensate
control valve
Check to see that the steam condensate control
valve is operating smoothly.
Weekly C
Refine refrigerant
Use the procedure shown in Refrigerant refining
method to refine the refrigerant.
Every 6 months S
Manual purging from purging
tank
See Purge procedure. Manually purge non-
condensable gas from the purging tank.
The chiller has an automatic
purge system. Perform it
one time at beginning of the
season every year and one
time every 2-3 months.
S
Manual purging from absorber
side
See Purge procedure. Manually purge non-
condensable gas from the absorber side.
Every 2-3 months S
Replacement of oil in vacuum
pump
Replace the oil in the vacuum pump periodically. Monthly C
YHAU-C Single Effect Steam-Fired Absorption Chiller152
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