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E2 RX/BX/CX I&O Manual Table of Contents • xi
11.4.3 Refrigeration Control................................................................................................................................... 11-11
11.4.3.1 EEVs (Liquid Pulse and Liquid Stepper)........................................................................................................... 11-11
11.4.3.2 EEPRs (Suction Stepper)................................................................................................................................... 11-12
11.4.4 Defrost Control ........................................................................................................................................... 11-12
11.4.4.1 Defrost States..................................................................................................................................................... 11-12
11.4.4.2 Defrost Types..................................................................................................................................................... 11-12
11.4.4.3 Defrost Termination........................................................................................................................................... 11-13
11.4.4.4 Demand Defrost................................................................................................................................................. 11-13
11.4.4.5 Emergency Defrost ............................................................................................................................................ 11-13
11.4.4.6 The WAIT State................................................................................................................................................. 11-13
11.4.5 Anti-Sweat Control....................................................................................................................................... 11-13
11.4.5.1 Dewpoint Input Sources..................................................................................................................................... 11-14
11.4.6 Dual Temp Control ...................................................................................................................................... 11-14
11.4.7 Fan Control.................................................................................................................................................. 11-14
11.4.8 Light Control................................................................................................................................................ 11-14
11.4.9 Clean/Wash Mode........................................................................................................................................ 11-14
11.4.10 Walk-In Freezer Control............................................................................................................................ 11-15
11.4.11 Fail-Safe Mode........................................................................................................................................... 11-15
11.4.11.1 Recoverable Sensor Failures............................................................................................................................ 11-15
11.4.12 Wiring......................................................................................................................................................... 11-16
11.4.13 Setting Up An Individual Case Controller................................................................................................. 11-16
11.4.14 Associating Case Controllers with Case Circuit Control Applications..................................................... 11-16
11.5 LOGGING GROUPS ............................................................................................................................................... 11-16
11.5.1 Possible Data Errors ................................................................................................................................... 11-17
11.5.2 Data Compression........................................................................................................................................ 11-17
11.5.2.1 Clipping.............................................................................................................................................................. 11-17
11.5.2.2 Incompressible Data Types................................................................................................................................ 11-17
11.5.3 Base Log Group ........................................................................................................................................... 11-17
11.5.4 Setting Up Logging ...................................................................................................................................... 11-18
11.5.5 Logging Group Status Screen ...................................................................................................................... 11-19
11.5.6 Log Reports.................................................................................................................................................. 11-19
11.5.6.1 Logging Group Report....................................................................................................................................... 11-19
11.5.6.2 Application Log Report ..................................................................................................................................... 11-19
11.5.6.3 System Log Report ............................................................................................................................................ 11-20
11.6 AIR HANDLING UNITS (AHU)............................................................................................................................. 11-20
11.6.1 Overview ...................................................................................................................................................... 11-20
11.6.2 Temperature Control.................................................................................................................................... 11-20
11.6.3 Alternate Setpoints....................................................................................................................................... 11-20
11.6.4 Fan Control.................................................................................................................................................. 11-21
11.6.4.1 Single-Speed Fans.............................................................................................................................................. 11-21
11.6.4.2 Two-Speed Fans................................................................................................................................................. 11-21
11.6.4.3 Variable-Speed Fans.......................................................................................................................................... 11-21
11.6.5 Economizer Control..................................................................................................................................... 11-22
11.6.5.1 Economization Enable ....................................................................................................................................... 11-22
11.6.5.2 Economization Lockout Features ...................................................................................................................... 11-22
11.6.6 Digital Economizer Control......................................................................................................................... 11-22
11.6.7 Analog Economizer Control......................................................................................................................... 11-22
11.6.8 Dehumidification Control ............................................................................................................................ 11-22
11.6.9 Curtailment .................................................................................................................................................. 11-23
11.6.10 Optimum Start/Stop (OSS) ......................................................................................................................... 11-23
11.6.11 Separate Setpoints...................................................................................................................................... 11-24
11.6.12 AHU Zone Control..................................................................................................................................... 11-24
11.6.13 Hardware Overview................................................................................................................................... 11-24
11.7 ZONE CONTROL................................................................................................................................................... 11-25
11.7.1 Overview ...................................................................................................................................................... 11-25