AEC 2-40 HP Portable Chillers - Manual (Page 28)

2-40 HP Portable Chillers Chapter 3: Installation 27 of 78
3-10 Automatic Water Make-Up Option
The chiller may be connected to an automatic make-up system if the optional package (float
switch, pressure regulating, pipe fittings, solenoid valve and 1/2” NPT city water make-up
connection) is factory installed.
Refer to the typical piping schematics on pages 64-69 in the Appendix for additional
components necessary for this installation.
Prevent reservoir over-pressurization by setting the required pressure-regulating valve to limit
make-up water pressure to less than 5 psi. The reservoir must remain vented to the
atmosphere.
If the automatic make-up system is connected to a city water system, make provisions to
prevent backflow contamination. Install an approved backflow preventer in accordance with
local codes.
Caution! Adding straight city water into a glycol/water mixture dilutes the solution and
eventually leads to system freeze-up. Damage from freeze-up is not covered by
the warranty.
To prevent system freeze-up in automatic make-up applications, we recommend using either
a chemical feeder or make-up reservoir to replenish glycol. Contact the sales department for
more information about these configurations.