Commissioning
General guidelines for use
Before operation
Note:
The unit does not have the vacuum pump. Use the service vacuum pump to purge the
vacuum initially.
Charge the solution and the refrigerant water if the solution and refrigerant water is in the barrels
during the delivery. During commissioning, check the motor’s rotating direction of the solution
pump, and refrigerant pump:
Note:
The flow of fluid cannot be seen because the solution and refrigerant pumps are
hermetically sealed.
CAUTION
Do not operate the solution pump without solution. Do not operate the refrigerant pump without
refrigerant water.
The rotation direction can be tested by using a rotation detector (Bell and Gosset or WILO DKG). If a
rotation detector is not available, use the following procedure:
1. Remove the plugs at the solution and refrigerant sampling valves.
2. Make sure the valves are completely closed.
3. Confirm that the absorber and refrigerant tank contain enough solution and refrigerant.
4. Connect a compound gauge (NPT ½ in.) to the sampling valve with Teflon tape.
Note:
The gauge scale must be -760 mm Hg to 2 Kg/cm
2
g, or -30 in. Hg to 30 psig. To
prevent corrosion of the gauge, clean it thoroughly, and check it for leaks after each use.
5. Operate the pump.
6. Open the valve.
7. Read and record the delivery pressure of the solution pump and the refrigerant pump.
8. Close the valve.
9. Check the pressure readings. See Table 25 to check if your pump rotation is in the right
direction. The correct directions shows a higher discharge pressure.
Note:
The delivery pressure reflects the high vacuum condition of the machine. If the
inside pressure is atmospheric, add 1.0 kg/cm (14.3 psig) to the standards in table.
10. Remove the compound gauge.
11. Put the plugs back on the valves.
12. Clean the gauge with water.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
84
