Table of Contents
Chapter 7 – Maintenance _____________________________________________________ 7-1
Preventive Maintenance Intervals __________________________________________________ 7-1
Daily or As Needed _____________________________________________________________________ 7-1
Every 3 Months ________________________________________________________________________ 7-1
Every 6 Months ________________________________________________________________________ 7-1
Every 12 Months _______________________________________________________________________ 7-1
Maintenance Procedures __________________________________________________________ 7-2
How to Clean the Chamber Interior and Exterior ______________________________________________ 7-2
How to Listen for Abnormal Noise or Vibration ______________________________________________ 7-2
How to Inspect the Door Seal _____________________________________________________________ 7-2
How to Inspect the Refrigeration Machinery Compartment ______________________________________ 7-3
How to Check the Low-Stage Refrigerant Charge _____________________________________________ 7-3
How to Check the High-Stage Refrigerant Charge _____________________________________________ 7-3
How to Verify the Performance (Non-controlled humidity mode) _________________________________ 7-4
How to Verify the Performance (Controlled humidity mode) ____________________________________ 7-5
How to Inspect the Electrical Compartment __________________________________________________ 7-6
How to Clean the Condenser ______________________________________________________________ 7-6
How to Drain the W100 Water Recirculation System Reservoir __________________________________ 7-6
How to Drain the Humidity System ________________________________________________________ 7-7
How to Verify the Temperature Calibration __________________________________________________ 7-8
How to Verify the Humidity Calibration ____________________________________________________ 7-9
Humidity Sensor Calibration and Maintenance _______________________________________________ 7-9
Theory of Operation _____________________________________________________________ 7-10
Overview ____________________________________________________________________________ 7-10
Air Heating System ____________________________________________________________________ 7-10
Humidity System______________________________________________________________________ 7-10
Refrigeration System (non-humidity mode) _________________________________________________ 7-11
Refrigeration System (controlled-humidity mode) ____________________________________________ 7-12
Troubleshooting ________________________________________________________________ 7-13
Refrigeration System Charging Instructions _________________________________________ 7-15
R-404A High-Stage Charge _____________________________________________________________ 7-15
R-508B Low-Stage Charge ______________________________________________________________ 7-15
Recommended Spare Parts _______________________________________________________ 7-16
Major Electrical Parts ___________________________________________________________ 7-17
Major Refrigeration Parts ________________________________________________________ 7-18
General Parts __________________________________________________________________ 7-18
EZ-Zone Limit Controller Setup Parameters ________________________________________ 7-19
Setup Menu __________________________________________________________________________ 7-19
Operations Menu ______________________________________________________________________ 7-19
Chapter 8 - Warranty ________________________________________________________ 8-1
Chapter 9 – Drawings ________________________________________________________ 9-1
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