Water/Glycol Cooled Unit Piping; Liquid Lines; Suction Lines - DA Data Cool Series Installation, Operation And Maintanance Manual

2.2

Water/Glycol Cooled Unit Piping

The required field installed condenser water pipe sizes may or may not be the same as the connection
sizes at the evaporator or fluid cooler. This will depend on the length of pipe and the calculated pressure
drop of peripheral components.
Remote water cooled condensing units may also be connected to building water or tower water sources.
Pipe size will depend on length of run and the maximum water flow required.
Shutoff valves should be installed within a few feet of the inlet and outlet connections of the evaporator to
allow the unit to be isolated for service. A fill valve with a hose bib connection should also be used on the
supply line or return line at the unit to allow the unit to be drained.
Water/glycol cooled units with plate-fin type condensers ship with a strainer. Strainer should be field
installed on the inlet water pipe. Strainers must be cleaned periodically.

2.2.1 Liquid Lines

Liquid line size is determined by pressure drop and velocity. The liquid line pressure drop should not
exceed 5 PSI. The recommended velocity should be between 200 and 300 FPM. To avoid excessive
liquid line pressure drop, the air cooled condensing unit should be located above or at the same level as
the evaporator. Condensing unit installation more than ten feet below the evaporator should be avoided.

2.2.2 Suction Lines

This unit has the compressor in the condensing unit. These cases require field piping of liquid and
suction lines. Suction lines are trapped similarly to discharge lines. Common practice for suction line
selection and installation should be followed.
One of the most common problems in a water/glycol system is the presence of air in the
condenser water loop. Air vents must be installed in various locations in the piping system to
purge the air, including the highest point in the water loop..
Data Cool
10