SterlingTEK A0551797 manual Checking Motor Direction, Compressor

SSC Series condensing pressure with 95ºF (35ºC) condenser air

R-22 = 260 psi (1,793 kPa/17.93 bars)

Note: Due to the variables involved in remote air-cooled condenser installations, no set or standard piping procedure exists. Each installation must be designed and installed by qualified persons. Follow the instructions supplied with the condenser.

3-11 Checking Motor Direction

Compressor

Note:

∙Never switch contactor leads or motor leads for reversing rotation.

∙Do not use contactor or motor leads for phase matching.

∙Compressor noise from reverse rotation is noticeable. Do not run in this mode for more than ten (10) seconds. The compressor shuts off if run longer in this mode.

∙Reverse rotation can cause suction and discharge pressures to be approximately equal; amp draws will be lower than normal.

∙If you discover that compressor rotation is reversed, correct it by switching any two main power leads into the disconnect switch or distribution block on the unit.

Water Pump

A positive pressure of 20 to 30 psi (137.9 to 206.8 kPa/1.38 to 2.07 bars) on the TO PROCESS line indicates correct pump rotation.

Condenser Fan

On SSC Series remote air-cooled units, air should draw through the condenser and discharge up from the condenser.

Changing fan rotation direction

∙Disconnect and lock out power at the fused disconnect.

∙If all fans are going backwards, reverse any two main power leads.

∙If only some of the fans are going backwards, switch any two of their respective motor leads.

SSC Series Central Chilling Stations Page 25 of 86