AEC NEC Central Station Air and Water Cooled Chiller - Manual (Page 47)

Page 46 NEC Series Water- and Air-Cooled Central Chillers
7-3 Evaporator Maintenance
Evaporator(s) may be accessed for back-flushing by removal of the two-inch (2”) plug in the
return control nipple and the flow switch in the supply control nipple. If the suggested piping
recommendations have been followed, one circuit of a multiple circuit chiller may be back-
flushed without shutting down the entire system.
7-4 Preventive Maintenance Service
A systematic preventive maintenance program helps avoid costly down time. Call the
Application Engineering Service Department at AEC, Inc. to arrange a schedule of inspections.
This service, described in AEC, Inc. Bulletin No. 10-106.3, is tailored to fit your maintenance
requirements. Inspections include:
; Checking refrigerant suction and discharge pressures.
; Checking safety and operating controls.
; Checking voltage and amperage of all motors.
; Checking all electrical connections.
; Checking quantity of refrigerant.
; Checking compressor oil level.
; Checking lubrication of motor and pump bearings.
; Checking circulating pump operation.
; Checking flow through heat exchangers.
; Checking compressor efficiency.
; Checking noise levels.
; Checking cleanliness of equipment area.