13-10-615 Page 20
BLOWDOWN VALVE PIPING - The blowdown valve is piped back into the airend between the inlet valve
and air filter.
WATER PIPING (Water-Cooled Heat Exchanger Models Only) - On machines equipped with water-
cooled heat exchangers, the water inlet and outlet connections are located in the unit base flange.
It is mandatory that any water cooled unit be installed in a shelter heated to
temperatures above freezing (32° F., 0° C).
The water source should be capable of supplying up to the maximum flow shown in Figure 2-5, page 19,
and Figure 2-6, page 19, at a minimum pressure of 40 psig (2.8 bar); maximum allowable water pressure
is 150 psig (10.3 bar). The water flow rates shown are approximate and a guide to sizing piping, cooling
tower and other water system equipment.
The heat exchanger system is designed to operate with water inlet temperatures from 60° F to 90° F
(16° C to 32° C) and a water outlet temperature not to exceed 110° F (43° C). If water cooler than 60° F
is used, high water outlet temperatures (over 110° F, 43° C) will be experienced along with shortened
heat exchanger life caused by tube fouling and corrosion. If water warmer than 90° F (32° C) is used,
higher compressor oil inlet temperatures and high water usage will result.
Most water systems will require control of impurities: filtration, softening or other treatment. See
“Compressor Oil Cooler - Water-Cooled Heat Exchanger”, page 54 for more information on the water
system.
Figure 2-7 – SERIES PIPING
SERIES PIPING (Figure 2-7, page 20) - Water flow must be through aftercooler first for effective cooling
of discharge air and is so piped on the standard water-cooled unit.
305EAQ797-
(Ref. Drawing)
C
C
C
A
A
A
U
U
U
T
T
T
I
I
I
O
O
O
N
N
N
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