Hyundai HDFN-80-1400, Руководство по эксплуатации, Страница: 44 / 69

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6.4.2 Operation procedure
(1) Open the valve V-10 when purging continuously. (Leave it opened while the purge pump is
running.)
(The valve V-10 is usually set at about one and a half turn opening from the fully closed position.
When non-condensable gas in the shell is less and the cavitation sound occurs, throttle the valve
V-10.)
All other valves are closed fully. Non-condensable gas accumulates in the purge chamber.
(2) Purging out non-condensable gas to the atmosphere
1) Run the purge pump with the valves V-2, V-3 and with the valves V-4 and V-5 opened.
Confirm the ultimate vacuum reaches below 2 mmHg.
2) When the ultimate vacuum reaches below 2 mmHg, open the valve V-2 first and check the
pressure valve inside the main shell by manometer.
3) Close the valve V-2 and open the valve V-3. Then, read the pressure value of non-
condensable gas in the purge chamber (reservoir) by manometer. If the pressure value
measured by manometer is found higher than the pressure value in the main shell, keep the
purge pump running. Then, non-condensable gas will be discharged to the atmosphere.
When the pressure value measured by manometer reaches the pressure value in the main
shell (the pressure value confirmed in the above item 2), close the valves V
–3, V-4 and V-5
and stop the purge pump. Non-condensable gas can be accumulated in the purge chamber
up to about 90 mmHg abs.
4) The valve V-6 is used for purging from the water header of the low pressure generator. It is not
used in ordinary purge.
6.5 Palladium Cell
Since lithium bromide solution which is used in the chiller-heater has corrosivity, an inhibitor is added
to the solution. When anti-corrosive thin film is formed on the inside surface of the chiller-heater by
the inhibitor, hydrogen gas generates.
The amount of the hydrogen gas to be generated is relatively much at initial operation of the machine
and decreases as the operating hour passes.
Performance, it must be purged out of the chiller-heater.
Hydrogen gas occupying the most part of the non-condensable gas, which is accumulated in the
purge chamber is purged out of the chiller-heater through the palladium cell which has a property to
absorb and permeate hydrogen gas when it is heated.
7. Cautions During Operation
7.1 Checking of Solution Concentration
The solution concentration of the outlet of the high pressure generator and low pressure generator
must be less than 64.5% while the chiller-heater is operating. Since the solution concentration
value reaches the largest at full load operation, pay a great attention to the solution concentration
value when the machine is operating at full load.
The solution concentration can be measured by the following procedure using the P.T.X. chart..
(Solution concentration at the low pressure generator outlet.)
1) Read the refrigerant temperature at the condenser outlet.
2) Read the concentrated solution temperature at the low pressure generator outlet.
3) Using Fig. 23 stand a perpendicular from the refrigerant temperature obtained above 1)
and search for a point of intersection with the line of “water”
4) Then, draw a horizontal line from the point of intersection obtained above 3) and search for
a point of intersection with the perpendicular stood from the solution temperature obtained
above 2). It is the point indicating the solution concentration.