When refining refrigerant, operate the absorption chiller under a low load (50% or less) for
higher refining efficiency. Note that the refrigerating capacity is dramatically reduced during the
refrigerant refining operation.
1. Remove the cap of the refrigerant manual blow valve.
Note: For the location of the refrigerant manual blow valve, see Figure 70.
2. Turn the spindle in the valve to the left using an 8 mm (0.3 in.) hexagon wrench to start refining
the refrigerant.
3. After the refining process is complete, close the spindle in the valve (turn it to the right until it
stops).
4. 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.
Note: The time required for refinement of the refrigerant depends on the current load
condition. Constantly check the liquid level in the refrigerant tank while the refrigerant is
refined. If the refrigerant liquid level appears in the level gauge of the refrigerant tank, close
the valve immediately and fully.
Manual refrigerant blowdown and diluting method
When the chiller stops suddenly due to a power failure, the solution can become crystallized. If this
happens, dilute the solution manually according to the following procedure.
Note: Perform the following procedure immediately after the power is restored.
1. Press the Forced Dilution ON button The solution pumps and the refrigerant pump start.
2. Remove the cap of the refrigerant manual blow valve.
Note: For the location of the refrigerant manual blow valve, see Figure 70.
3. Turn the spindle in the valve to the left with the 8 mm (0.3 in.) hexagon wrench. The refrigerant
in the refrigerant tank is diverted into the absorber.
4. Watch the liquid level of the refrigerant tank. Immediately after the refrigerant liquid level
appears in the level gauge of the refrigerant tank, close the valve (turn it to the right until it
stops).
5. Press the Refrigerant Pump Stop button. The refrigerant pump stops.
6. Let the solution pump operate independently for 30 minutes.
7. Press the Forced Dilution OFF button to stop the solution pump.
8. Press the Refrigerant Pump Auto button.
9. 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.
Decrystallization method
If the solution in the absorption chiller is crystallized during operation, it can be melted if the
crystallization is not severe. As it becomes more difficult to melt the crystals as time passes,
YHAU-C Single Effect Steam-Fired Absorption Chiller150
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