Screw Compressor Central Chiller
Chapter 3: Installation
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2.
If the gauge indicates 20 psi (137.9 kPa/1.38 bars) or more
below the pump curve, the pump is running backwards. Reverse
rotation by interchanging any two power mains to the pump
motor or starter.
3.
Recheck the pressure to be sure it increased.
22.
Check the water level in the pump tank to be sure the pump does not run dry while
the system piping is being filled.
23.
Open the discharge fully when system is filled.
24.
Check your work and proceed to the Startup procedure in the following section.
Determining Chilled Water Flow Rate
To determine flow:
1.
Close the gauge cock leading to the pump suction side and open the gauge cock
leading to the pump discharge.
2.
Start the pump and make note of the discharge pressure in psi (kPa/bars).
3.
Check the pump curve for the appropriate horsepower pump at the discharge pressure
psi.
4.
Project this point down to find the flow in gpm (lpm).
5.
Process pumps can be left wide open if running amps are below full load amps.
