G – Piping Connection
April, 2018 G-6 INM.XX.X.00
Pressure Testing and Charging
Refer to the fluid cooler and/or dehumidifier’s main label and
submittal documentation for operating pressure and cooling
media selection.
o Typically, mixture of food grade propylene glycol
(with rust inhibitors added) and distilled water is
used as a cooling fluid. The mixing ratio is typically
30-35% glycol; however, a higher glycol
concentration (e.g., 50%) could be used for northern
application – refer to the equipment submittal
documentation.
o To calculate approximate (!) Total System Volume
(amount of fluid required for system charging), add
Internal Fluid Cooler Volume (see submittal
documentation) to Line Set Volume (calculate based
on the used pipe diameter and line set actual length).
Increase calculated Total System Volume by 3-5% -
final charge of the system would be determined
during the charging (see below).
Charge system at its lowest point and bleed the air out at the
system top point(s); charging at multiple lowest points (at
fluid cooler and dehumidifier) may be required.
o Use a separate charging pump. The dehumidifier
and/or fluid cooler pump(s) are selected/designed to
maintain fluid circulation and not be used for
charging. Ensure fluid is clean, free of any debris etc.
o Ensure thorough air removal from the system –
airlocks will prevent system from operating properly.
o Ensure that static pressure at the highest point of the
system is at least 15-20 psi. Verify it after bleeding all
the air from the system.
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