Sterling GP Series specifications Automatic Water Make-Up Option, Initial Start-Up

3-10 Automatic Water Make-Up Option

The chiller may be connected to an automatic make-up system if the optional package (pipe fittings, solenoid valve and 1/2” NPT city water make-up connection) is factory installed.

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.

3-11 Initial Start-Up

•Check the shipping papers against the serial tag to be sure chiller size, type and voltage is correct for the process that will be controlled. Portable chillers are built with a voltage specific compressor and cannot be re-wired for an alternate voltage.

•Check the transformer primary voltage connections to be sure they are configured for the electrical power you are using. The voltage at the main power connection must read within plus or minus ten percent (±10%) of the voltage listed on the serial tag. Electrical connections must conform to all applicable codes.

•Complete chilled water To Process and From Process connections.

•Be sure the reservoir tank and chilled water circuit piping are filled a water/glycol mixture. The water/glycol mixture should provide for freeze protection to at least 20°F (11ºC) below the leaving water temperature you want. Should the display show a tank level less than 0 after the tank is filled, check the clear tube leading from the tank to the tank level pressure switch for a blockage.

•The air-cooled condenser should have an adequate supply of 60º to 115ºF (16º to 46ºC) air for proper operation.

•The tower or city water condenser cooling in and out connections should be completed and an adequate supply of 85ºF (30ºC) tower or 70ºF (21ºC) city water, at 25 psi pressure, for proper operation.

•Connect the main 3 phase incoming power to the unit making certain that line one (1) L1 is connected to the A phase, line two (2) L2 is connected to the B phase, and line three (3) L3 is connected to the C phase. Check for proper rotation direction of fan(s) and pump(s).

The crankcase heater is automatically energized when the main power is applied. It should be on for at least 24 hours before startup to force dissolved refrigerant from the compressor oil.

3-12 Finishing Setup: Setting Up Passwords

You can establish passwords for two levels of security: operators and supervisors. The controller comes from the factory with neither password set. This allows every user access to all functions.

GP Series Portable Chillers Chapter 3: Installation 19 of 44