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(1) Reduction of cooling capacity due to the rise of evaporating pressure and the drop of
absorbing ability.
(2) Increase in fuel consumption
(3) Growth of corrosion inside the chiller-heater due to the consumption of the
inhibitor in the lithium bromide solution, which may cause to shorten the machine life.
(4) Deterioration of the operating cycle due to cut-out of the pressure switch by the rise of the
pressure and temperature in the high temperature portion and actuation of the solution
temperature control device, which may accelerate the deterioration of the packings and O-
rings and may result in leakage. These are fatal to the chiller-heater. To purge non-condensing
gas out of the chiller-heater is called "purging". And the chiller-heater is equipped with the
purging unit for purging.
(5) The chiller-heater is provided with the palladium cell and purge pump as standard to purge
non-condensing gas like hydrogen gas, etc. Out of the chiller-heater continuously during
operation.
6.2 Purging Operation
(1) Make sure that the manual purge valves (valve V-2 and V-3) are closed and operate the purge
pump. (Refer to Fig. 6.2)
(2) Close the ballast valve and operate the purge pump for 10 minutes. Then confirm that the number
of non-condensable gas bubbles is less than 2 per minute. The degree of vacuum must be below
2 mmHg.
Note : The ballast valve must be kept open during vacuuming the chiller-heater except when
checking the number of non-condensable gas bubbles.
(3) Open the manual purge valves (valve V-2 and V-3) and count the number of non-condensable gas
bubbles 1 minute after closing them.
(4) Close the manual purge valves (valve V-2 and V-3) and count the number of non-condensable gas
bubbles 1 minute after closing them.
(5) The balance between the number of non-condensable gas bubbles counted in above item (3) and
the number counted before opening the main purge valve is amount of non-condensable gas
coming out of the chiller-heater. The standard number of non-condensable gas bubbles is less
than 5 to 10 per minute.
(6) After operating the purge pump for 15 minutes check the number of non-condensable gas bubbles
once again. Unless the number of non-condensable gas bubbles decreases, check in the
following procedure.
(7) If the oil in the purge pump is muddy, replace it with fresh oil.
(8) Open the ballast valve and keep running the vacuum pump for about 2 hours.
(9) Check the number of non-condensable gas bubbles in the same way as mentioned above. When
the number of non-condensable gas bubbles does not decrease after the 2 hour operation,
leakage can be considered. So perform leak test.
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