perform the following operation immediately when crystallization is detected. If the crystals
cannot be melted by the following procedure, notify your local Johnson Controls Service Center
immediately.
Indications of crystallization
• The refrigerating capacity goes down. The liquid level in the absorber drops. Cavitation noise
comes out of one or more of the solution pumps.
• One of the following buttons is lit and the solution circulation or solution spray pump trips:
- Sol. Circu. P. Abnormal
- Sol. Spray P. Abnormal
• The solution level is visible through the level gauges on the generator.
• The liquid level in the absorber drops. The temperature of the solution returning from the
generator falls too.
Decrystallization
1. Stop the chiller. If the solution pump tripped, reset the thermal relay.
2. Disconnect the electrical wiring of the solution pump.
3. Navigate to the Setting screen on the Control Panel.
4. Press the Forced Dilution ON button.
Note: As the electrical wiring of the solution pump is disconnected, only the refrigerant
pump starts.
5. Remove the cap of the refrigerant manual blow- down valve V8.
Note: For the location of the refrigerant manual blow valve, see Figure 70.
6. Turn the spindle in the valve to the left with the 8 mm (0.3 in.) hexagon wrench.
Note: The refrigerant in the refrigerant tank diverts into the absorber.
7. Watch the liquid level of the refrigerant tank.
8. Immediately after the refrigerant liquid level appears in the level gauge of the refrigerant tank,
close the refrigerant manual blow-down valve (turn it to the right until it stops).
9. Press the Refrigerant Pump Stop button. The refrigerant pump stops.
10. Press the Forced Dilution OFF button.
11. Reconnect the electrical wiring of the solution pump.
12. Press the Forced Dilution ON button. The solution pump starts.
13. Press the Control Valve Mode Manual button.
151YHAU-C Single Effect Steam-Fired Absorption Chiller
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