AEC NEC Central Station Air and Water Cooled Chiller - Manual (Page 39)

Page 38 NEC Series Water- and Air-Cooled Central Chillers
5-3 Water-Cooled NEC Chiller Startup
1. Turn the chiller ON and put it under a process load.
2. Set the controller to the process temperature you want.
3. Adjust the freezestat cutout dial, located on the control nipple, to 10°F below the process
temperature set point.
4. Check the auxiliary pump(s) amp draws and pressures.
Amp draws must be within the running load of the pump(s) and service factor amps.
5. Operate the chiller, looking for leaks and listening for unusual noises or vibrations that
could indicate improper operation.
6. Check for proper pressure drops across the condenser and evaporator as shown in Figures
8 and 9.
5-4 Air-Cooled NECR Startup Checklist
; Check shipping papers against the serial tag to be sure chiller size, type, and voltage is
correct for the process.
; Check the transformer primary voltage connections to make sure that they are configured for
the electrical power you are using.
; Make sure that the voltage at the main power connection is within plus or minus ten percent
(±10%) of the voltage listed on the serial tag.
; Make sure that phase imbalance is less than two percent (2%).
; Make sure that all electrical connections are tight and conform to all applicable codes.
; Complete chilled water
TO and FROM PROCESS connections.
; Make sure that the optional or field-installed chilled water supply and return valves are open.
; Make sure that you fill the auxiliary reservoir tank and chilled water circuit piping with a
proper water/glycol mixture. The water/glycol mix should provide freeze protection to 20°F
below the leaving water temperature you want.
; The air cooled condenser should have an adequate supply of air for proper operation.