ACS HE Series, Operation And Instruction Manual

Page: 66 / 83

HE Series Central Chillers Chapter 8: 66 of 83
Chapter 8: Maintenance
Lubrication
Refrigeration compressors are hermetically sealed and no lubrication is required.
Maintaining the Condenser
Dirty condenser heat exchange surfaces reduce system capacity and efficiency.
Remote Air-Cooled Chillers
Brush or vacuum light dirt accumulations off the aluminum condenser fins. Avoid
bending or damaging them. Heavy dirt accumulations on the fins may require
professional cleaning.
Water-Cooled Chillers
Proper water treatment will greatly reduce cleaning intervals.
Shell & Tube Condensers ( HEWC20T-60T ) Remove dirt and slime in the
condenser tube water side by cleaning with a nylon tube brush. Remove mineral
deposits by reverse circulating Liquid Inhibited Acid De-Scaling Solution (Part No.
216.00017.00) through the tube water side of the condenser. Follow the directions on
the container.
The refrigerant side is sealed and requires no routine maintenance.
Caution! Do not use steam or water over 140ºF (60ºC) to clean a condenser unless you
are monitoring the refrigeration module for excessive pressure with gauges.
Only a trained technician should use this method.
Maintaining the Evaporator
Dirty evaporator heat exchange surfaces reduce system capacity and efficiency.
Remove dirt and slime in the evaporator by reverse-circulating with a mild detergent
and water solution.
Remove mineral deposits by reverse-circulating Non-Acid De-Scaling Solution (Part
No. 216.00017.00). Follow the directions on the container.
To perform the evaporator flush
1. Close the evaporator process inlet and outlet butterfly valves.
2. Open the upper and lower evaporator ball valves to drain the process fluid
from the evaporator.
3. Connect an isolated pumping system (similar to ACS Part number
602.83607.00) to the upper and lower evaporator ball valves with the inlet to
the lower valve and the outlet to the upper valve
4. Operate the pumping system until there is no visible debris returning to the
tank, or for a minimum of 30 minutes.