4. Use the procedure shown in
, to purge air from the low pressure side
(absorber).
Note:
Remember: Only deionized water can be used as the refrigerant in the chiller-heater
Purge procedure
Air must be purged from the chiller-heater to maintain its performance and prevent deterioration
of its internal parts. This chiller-heater has an automatic purge system.
Even if the automatic purge mode is used during normal operation, perform the manual operation
for the purging tank and absorber periodically.
Capacity check method of service 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.
Note:
The service vacuum pump is not mounted on the chiller-heater, the service team or
client must prepare. The pump can connect the wire to MC6 contactor in the control panel,
but when the vacuum power is 208 V-3 Ph-60 Hz, the max current of vacuum pump is 4 A.
When the vacuum power is 460 V-3 Ph-60 Hz, the max current of vacuum pump is 2.5 A. If
the vacuum pump is too big, it overloads the MC6.
3. Open the gas ballast for 5 minutes. Close the gas ballast valve for the performance inspection.
CAUTION
If the purge unit is operated with the gas ballast closed, water is left in the oil. The oil needs to be
replaced more frequently.
4. Connect the three wires of the service vacuum pump to U6, V6, W6 of the MC6 contactor in
the control panel terminal. Connect the purge hose from the absorber purging valve to the
vacuum pump suction port.
5. Press the purge pump Mg-SW
ON
button. The MC6 closes, so the vacuum pump runs.
6. Check the rotation of the vacuum pump according to the rotation mark on the vacuum pump.
7. Connect the hose from the vacuum pump exhaust port into the water. Run the vacuum pump.
Check the bubble release speed. When the bubble release speed is less than 2 per minute, the
performance of the vacuum pump is accepted.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
146
