Chapter 7 – Maintenance
Page 7-8 TestEquity 106 & 107 Temperature Chamber
Refrigeration System Charging Instructions
! WARNING: Repair of the refrigeration system must be performed only by a properly
trained mechanic. Do NOT substitute any component. Do NOT substitute
refrigerants. Improper repairs will void the warranty.
These instructions are intended as guidelines for repairing TestEquity chambers. Details such as
how to attach a gauge manifold are not covered. These are NOT do-it-yourself instructions!
R-410A Charge
The proper charging procedure is as follows:
1. Repair any leaks before recharging. Replace the filter/drier.
2. Evacuate the system to 100 microns. DO NOT GUESS! You must use a micron gauge.
3. Use a charging scale to weigh in 7.0 ounces of R-410A. DO NOT GUESS! You must use an
accurate charging scale.
4. Verify the cooling performance as outlined in “How to verify the chamber performance”.
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