Capacity check method of vacuum pump
For commissioning and regular maintenance, check the capacity of the vacuum pump first
according to the following procedure.
1. Check the oil level in the vacuum pump.
2. If the oil is cloudy, it contains water and must be replaced with new oil.
3. Open the gas ballast (remove the plug).
CAUTION
If the purge unit is operated with the gas ballast closed, water is left in the oil. The oil then needs to be
replaced more frequently.
4. Set the valves according to pattern A shown in Figure 69.
5. Press the Purge Mode MANUAL button.
6. Press the Manual Purge ON button. The solenoid valves SV1 and SV2 open, and the vacuum
pump starts.
7. 1-2 minutes after the vacuum pump starts, confirm that the vacuum gauge stands at 0 -
approximately 0.15 psia (1 kPa.a).
8. Press the Manual Purge OFF button. The vacuum pump stops.
9. Wait for 30 minutes.
10. Confirm that the vacuum down is within 0.3 psia (2 kPa.a).
YHAU-C Single Effect Steam-Fired Absorption Chiller144
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