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 Chiller
150
Summary of Contents for York YHAU-C
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Page 33: ...Figure 11 Location of rupture disk 31 YHAU C Single Effect Steam Fired Absorption Chiller...
Page 103: ...Figure 49 Cooling start diagram 101 YHAU C Single Effect Steam Fired Absorption Chiller...
Page 104: ...Figure 50 Cooling stop diagram YHAU C Single Effect Steam Fired Absorption Chiller 102...
Page 166: ...Figure 73 Steam and drain system YHAU C Single Effect Steam Fired Absorption Chiller 164...
Page 167: ...Figure 74 Duhring diagram PTX chart F 165 YHAU C Single Effect Steam Fired Absorption Chiller...
Page 168: ...Figure 75 Duhring diagram PTX chart C YHAU C Single Effect Steam Fired Absorption Chiller 166...
