Refrigeration Piping; Figure 9: Drain Connection - Compu-aire SYSTEM 2100 Installation, Operation And Maintenance Manual

ready disconnection from the unit for easy cleaning. Where local codes permit, PVC pipe
may be used for drain lines. It is important that the drain line used for drain lines. It is
important that the drain line installed with sufficient slope to permit easy draining. Drain
lines should have a pitch away from the unit not less than 1/4" for each 10 feet of run.
Do not reduce the size of the drain line.
A secondary drain connection is provided to from the bottom pan of the unit.
Secondary drain line provides drain connection from the base pan of the unit that is the
lowest point in the unit. The secondary drain connection is 3/4" stub and external P-trap
is required for this drain. If secondary drain line is provided with the unit but it is not
connected to the building drain, it must be capped off.
On some applications were a floor sink or other means of condensate disposal is not
available, a condensate pump of adequate size should be used. There are several
condensate pumps available complete with built in floats for automatic condensate
removal. The correct choice of pump depends greatly on the pressure head (vertical
riser) that must be overcome. In some instances, where the head is higher than pump
head capacity, two pumps pipes in series may be necessary. A check valve must be
installed at the discharge side of all condensate pumps to reduce short cycling.

8.5 Refrigeration Piping

It is of the greatest importance that all refrigerant piping be cleaned and free
from dirt and moisture. One drop of water in a refrigerant system will greatly
deter the operation and efficiency of the system. Upon installation, all open ends
Rev. 01
05/27/2016

Figure 9: DRAIN CONNECTION

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