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Manafacture: AEG
File size: 918.23 kb
File name: 30hr,hs-1t~1.pdf
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manual abstract
l-4 Generat ..................................... 1 Features ..................................... 2 . PROCESSOR MODULE ................... 2 l• LOW-VOLTAGE RELAY MODULE ......... 2 . EXV (ELECTRONK EXPANSION VALVE) DRIVER MODULE ............... 2 . KEYBOARD AND DISPLAY MODULE ..... 2 . ELECTRONIC EXPANSION VALVE ........ 3 l• THERMISTORS ........................... 3 . CAPAClTY CONTROL .................... 3 CONTROL SEQUENCE ..................... 4,5 Off Cycle.................................... 4 Start-Up .................................... 4 Capacity Control ............................ 4 l• SEQUENCE ............................... 4 Unit Shutdown .............................. 5 Complete Unit Stoppage ..................... 5 Single-Circuit Stoppage ..................... 5 Lag Compressor Stoppage ................... 5 Restart Procedure ........................... 5 l• GENERAL POWER FAlLURE .............. 5 l• BLOWN FUSE IN POWER FEED DISCONNECT ............................ 5 l• LOW WATER TEMPERATURE CUTOUT.................................. 5 l• AUXILIARY INTERLOCK ................. 5 l• OPEN CONTROL CIRCUlT FUSE .......... 5 . FREEZE PROTECTION .................... 5 a HIGH-PRESSURE SWITCH ................ 5 l• LOSS OF CHARGE SWITCH ............... 5 . COMPRESSOR DISCHARGE TEMPERATURE SWITCH ................. 5 . OIL SAFETY SWITCH ..................... 5 CONTROLS OPERATION .................. .5-l I Accessing Functions and Subfunctions....... 5 Qisplay Functions ........................... 5 a SUMMARY DISPLAY ..................... 5 . STATUS FUNCTION ...................... 5 . TEST FUNCTION ........................ 10 Programming Functions .................... 1 I . SERVlCE FUNCTION .................... 11 l• SET POINT FUNCTION .................. 11 l• SCHEDULE FUNCTION .................. 11 TROUBLESHOOTING ..................... 12-26 Checking Display Codes .................... 12 l• OPERATING MODE CODES .............. 12 . ALARM CODES ......................... 12 Quick Test ................................. 14 Electronic Expansion Valves ................ 19 l• CHECKOUT PROCEDURE ............... 19 l• EXV OPERATION ........................ 21 Thermistors ................................ 22 l• LOCATION .............................. 22 l• SENSOR REPLACEMENT ................ 22 Modules .................................... 23 SAFETY CONSIDERATIONS Installation, start-up and servicing of this equipment can be hazardous due to system pressures, electrical components and equipment location. Only trained, qualified installers and service mechanics should install, start-up and service this equipment. When working on the equipment, observe precautions in the literature, tags, stickers and labels attached to the equipment and any other safety precautions that apply. l• Follow all safety codes. 0 Wear safety glasses and work gloves. l• Use care in handling, rigging and setting bulky equipment. l• Use care in handling elcetronic components. ELECTRII~ SHOCK HAZARD. Open all remote disconnects before servicing this equipment. This unit uses a micreprocessor-based electronic control system. 190 not use jumpers or other toolsto short out components, bypass or otherwise depart from recommcndcd procedures. Any short-toground of the control board or accompanying wiring may destroy the electronic modules or electrical component. FLOTRONIC PLUS CONTROL SYSTEM General The 30HR,HS Flotronic Plus chillers feature microprocessor-based electronic controls and an electronic expansion valve (EXV) in each refrigeration circuit. The Flotronic Plus control system cycles compressors and compressor unloaders to maintain the selected leaving water temperature set point. It automatically positions the EXV to maintain the specified refrigerant superheat entering the cylinders of the compressor. Safeties are continuously monitored to prevent the unit from operating under unsafe conditions. A scheduling function, programmed by the user, controls the unit occupied/ unoccupied schedule. The control also operates a Quick Test program that allows the operator to check input and output signals to the microprocessor. The control system consists of a processor module (PSIO), low-voltage relay module (DSIO), electronic expansion valve (EXV), EXV driver module (DSIO), keyboard and display module (HSIO) and thermistors to provide analog inputs to the microprocessor. The software resides in the PSIO. Features The 30HR,HS control panel is shown in Fig. 1. PROCESSOR MODULE This module contains the operating software and controls the operation of the machine. It continuously monitors information received from the various temperature thermistors and communicates with the relay module to increase or decrease the active stages of capacity. The processor module also controls the EXV driver module, commanding it to open or close each electronic expansion valve in order to maintain approximately 20 F of superheat entering the cylinders of each of the Iead compr...