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following work.
(1) Pressurize the chiller-heater with nitrogen gas up to about 0.2Kg/cm²G. This is to prevent air entry
to the shell and corrosion of the internal surface. When charging nitrogen gas into the shell,
connect the shell with a nitrogen gas cylinder by means of a copper equipped with the pressure
gauge.
Discharge air from the connecting tube before fastening the flare nut of the pressure gauge. Then,
open the valve of the pressure gauge adjusting the control valve of the nitrogen gas cylinder. Do
not exceed 0.35Kg/cm²G in its pressure.
(2) Replace the oil in the purge pump with fresh oil and operate the pump for about one hour once a
week.
9.
Maintenance and Inspection
Proper maintenance will ensure the full performance of Hyundai Climate Control Co., Ltd. Direct-fired
Absorption Chiller-heater. It is required for securing efficient operation, safety operation and long life
of the machine.
9.1 Daily Inspection
9.1.1 Vacuum maintenance of the unit
Since the leakage may cause the drop of refrigerating capacity of the chiller-heater and solution
crystallization, pay a great attention to the maintenance of the vacuum in the unit.
(1) Leak test of the vacuum pump
i.
ii.
iii.
iv.
9.1.2 Purging operation
Perform purging operation once or twice a week normally, or it should be done once or a day
depending on the operating condition. Especially, immediately after the initial operation of the
chiller-heater some amount of non-condensable gas is likely to generate in the unit. Hence,
perform purging operation for a longer time. Refer to item 7. "Purging Operation" as for purging
procedure.
9.1.3 Recording operation data
Recording daily operation data together with the trial operation data for future reference of
operation control. The records enable you to know ordinary machine conditions and to detect the
signs of abnormal phenomena and take earlier countermeasures to them. Besides, as the daily
records collected tell gradual changes in the machine career, proper countermeasures can be
taken timely. Refer to the operation record sheet of Table 9.1.
Connect a vinyl hose with the discharge pipe of the vacuum pump and soak the other
end of the vinyl hose into the pump oil container. Be sure that the point of the hose is
not soaked in the oil more than 6 mm.
Close the manual valve between the purge pump and the main shell and close the
ballast valve of the purge pump.
Check if the obtained pressure of the purge pump is less than 2 mmHg abs.
Unless non-condensable gas bubbles come out after three minute operation of the
purge pump, it indicates no leaks in the purge pump and purging system line.
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