50
Purge Tank at a Negative Pressure
If the purge tank is at a negative pressure, as indicated by the chiller condenser pressure
gauge, it will be necessary to slightly pressurize the purge tank.
First, isolate the purge tank by closing the vapor inlet isolation ball valve (V1 in Figure 5 on
page 18) and the liquid return angle valve at the chiller evaporator.
Important: do not rely
on the liquid return solenoid valve to isolate the purge tank.
This valve utilizes a special
seat material which does not seal off bubble tight. When isolating the pur ge tank always use
the chiller angle valve. Next, using the purge tank water drain angle valve, pressurize the
purge tank to approximately 2 psig using dry air or nitrogen.
WARNING: When pressurizing the purge tank, be careful not to exceed 15 psig.
Pressurizing the tank above 15 psig could result in serious injury or even death.
The free standing water can now be drained off as described above under
"Purge Tank at a
Positive Pressure".
NOTE
:
An alternative to pressurizing the purge tank would be to draw a vacuum on a suitably
approved container and allow the pressure differential to push the free standing water
from the purge tank into the container.
Содержание Redi-Purge PRG-113-C3
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