HP Performance Optimized Data Center (POD) 240a User Manual
Maintenance 78
Continue preparing the Adiabatic units for winter by completing the instructions in "Supply header
)."
Supply header blowdown
Before you begin the process below, be sure to complete the steps in the following sections:
1.
2.
Be sure that all Adiabatic units are isolated from the supply header. If all Adiabatic units are not isolated from
)." To be sure the maximum amount of
water is removed from the entire supply header(s), complete the following steps:
IMPORTANT:
Be sure air pressure is available to complete the next steps.
1.
Pressurize the supply header to 20-50 psi with a pressure gauge, if installed, and close the Y-strainer
flushing valve.
flushing valve.
2.
Open the supply header drain valve to release the air pressure and water.
3.
Close the supply header drain valve when the header pressure is zero.
4.
Repeat the steps to open and close the drain valve for five cycles, or until no water remains.
At this point, all headers are at atmospheric pressure, all water is removed from the system, and all
power is removed at each Adiabatic unit.
At this point, all headers are at atmospheric pressure, all water is removed from the system, and all
power is removed at each Adiabatic unit.
5.
Remove the garden hose and air adapter assemblies, and then replace the previously removed plugs.