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SCW Series Central Chilling Stations Page 39 of 77
; 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 SCW 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.
Note: If the recirculation pump does not turn on (or that the flow switch is not satisfied) the
compressors will not be allowed to turn on.
6. Check the pump(s) amp draws and pressures. The amp
draws must be within the pump(s) running load and service
factor amps.
7. Operate the chiller, looking for leaks and listening for
unusual noises or vibrations that could indicate improper
operation.
8. Check condenser fans for pressure switch settings as shown
in the table below:
Fan Set on Set off
number psi kPa bars psi kPa bars
1 Not applicable; Fan 1 is a variable-speed fan
2 155 1,069 10.7 120 828 8.3
3 170 1,172 11.7 135 931 9.3
4 185 1,276 12.8 150 1035 10.3
5 200 1,379 13.8 165 1,138 11.4