Table of Contents
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Note: Manual For Reference Only - Actual Chamber May Vary Depending on Model Year, Options, Controllers, and
Individual Configuration
TENNEY ENVIRONMENTAL
ENVIRONMENTAL TEMPERATURE TEST CHAMBER
MODEL NO. T20C-3
CHAMBER TYPE: TEMPERATURE
WATLOW 942 CONTROLLER
CONTROLLER TYPE:
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Table of Contents
Related Manuals for Tenney T20C
Summarization of Contents
INSTALLATION INSTRUCTIONS
Delivery and Handling
Inspect equipment upon receipt, handle in upright position, and check for loose connections.
General Information and Connections
Chamber setup, ventilation, air, and gas supply connections.
Water and Power Connections
Connecting water supply for cooling and verifying power supply before operation.
WATLOW 942 CONTROLLER OPERATION
Temperature Control Logic
Explains compressor turn-on logic based on temperature, hysteresis, and deadband.
Controller Versions
Details the different nomenclature and versions of the Watlow 942 controller.
ALARM AND SHUTDOWN CIRCUITS
Circuit Operations and Warnings
Describes normal operation, heat limiter, and alarm conditions.
TempGard IV and Reset Procedures
Optional TempGard IV features, alarm reset, and silence switch functionality.
REFRIGERATION SYSTEM DESCRIPTIONS
Single Stage System
Details the components and operation of the basic single stage refrigeration system.
Cascade System Overview
Describes the components and operation of the cascade refrigeration system.
REFRIGERATION SAFETY DEVICES
High/Low Pressure Cutouts
Explanation of high and low pressure cutouts, their causes, and settings.
Motor Overload Protection
Details motor overload protection, its causes, and automatic reset function.
OPTIONAL FEATURES
Boost Functions and Purge Air
Details on optional boost heat, boost cooling (LN2/CO2), and purge air systems.
Data Logging and Control
Information on optional chart recorders, data communications, and LinkTenn software.
TROUBLESHOOTING AND SERVICE
General Troubleshooting
Safety precautions and initial checks when encountering operational issues.
Troubleshooting Guide
Common problems, their possible causes, and suggested corrective actions.
SERVICING CASCADE REFRIGERATION SYSTEMS
Introduction and History
Purpose and historical context of servicing cascade refrigeration systems.
System Components and Operation
Description of cascade system components like high/low stages, coils, tubes, and their operational roles.
Refrigerant Handling and Testing
Procedures for leak testing, static charge testing, and evacuation of refrigerant systems.
Refrigerant Flow and Charging
Detailed explanation of refrigerant flow and specific instructions for charging the low stage.
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