Sterling A0554831 User Manual
2-40 HP Portable Chillers
Chapter 3: Installation
27 of 70
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.
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.
components necessary for this installation.
Note:
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.
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.
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.
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.
a chemical feeder or make-up reservoir to replenish glycol. Contact the sales department for
more information about these configurations.