Sterlco S Series Central Chilling Stations - Manual (Page 37)

SSC Series Central Chilling Stations Page 37 of 86
; Check for proper pump rotation direction. To confirm proper
rotation:
1. Observe a pump pressure gauge connected to the
suction and discharge sides of the pump casing through
two ¼” (approx. 6.4 mm) gauge cocks.
2. Close the gauge cock leading to the pump suction and
open the gauge cock leading to the pump discharge.
3. Close the discharge butterfly valve, crack it open, then
start the pump and observe the gauge.
• If the gauge indicates within 15 psi (103.4 kPa/1.03
bars) below the pump curve, pump rotation is
correct. Pump rotation is clockwise opposite the
shaft end.
• 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.
• Recheck the pressure to be sure it increased.
; Check the water level in the pump tank to be sure the pump
does not run dry while the system piping is being filled.
; Check your work and proceed to the Startup procedure in the
following section.
5-5 Remote Air-Cooled SSC Series Startup
1. Start the chiller by pushing the Start button on the control
panel of the unit.
2. The touchscreen will display the Main Menu screen.
3. If your chiller has been setup to control the pump tank, the
recirculation pump will turn on first, then after 5 seconds
the process pump will turn on. If configured with a standby
pump, the lead/lag will control which pump turns on.
4. Fifteen (15) seconds after the last pump turns on the first
compressor will turn on. Based on the temperature of the
water, the controller will turn on compressors every 15
seconds.
5. Adjust the Freezestat cut-out, located in the main electrical
enclosure, to 10°F (6ºC) below the process temperature set
point you want.