Assessments - 4, GPA: 3.3
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Book 2 PC 903 Catalog No. 563-079 Printed in U.S.A. Form 30GN-3T Pg 1 7-95 Replaces: 30G-1T Tab 5c SAFETY CONSIDERATIONS Table 1 — Unit Sizes and Modular Combinations Installing, starting up, and servicing this equipment can be hazardous due to system pressures, electrical components, and equipment location (roof, elevated structures, etc.). Only trained, qualified installers and service mechanics should install, start up, and service this equipment. When working on this equipment, observe precautions in the literature, and on tags, stickers, and labels attached to the equipment, and any other safety precautions that apply. Follow all safety codes. Wear safety glasses and work gloves. Use care in handling, rigging, and setting this equipment, and in handling all electrical components. Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and service. There may be more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed. This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short out components, or to bypass or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the electronic modules or electrical components. GENERAL IMPORTANT: This publication contains controls, operation and troubleshooting data for 30GN040-420 Flotronic™ II chillers. Circuits are identified as circuits A and B, and compressors are identified as A1, A2, etc. in circuit A, and B1, B2, etc. in circuit B. Use this guide in conjunction with separate Installation Instructions booklet packaged with the unit. The 30G Series standard Flotronic II chillers feature microprocessor-based electronic controls and an electronic expansion valve (EXV) in each refrigeration circuit. NOTE: The 30GN040 and 045 chillers with a factory- installed brine option have thermal expansion valves (TXV) instead of the EXV. Unit sizes 230-420 are modular units which are shipped as separate sections (modules A and B). Installation instructions specific to these units are shipped inside the individual modules. See Table 1 for a listing of unit sizes and modular combinations. For modules 230B-315B, follow all general instructions as noted for unit sizes 080-110. For all remaining modules, follow instructions for unit sizes 130-210. UNIT MODEL 30GN NOMINAL TONS SECTION A UNIT 30GN SECTION B UNIT 30GN 040 40 — — 045 45 — — 050 50 — — 060 60 — — 070 70 — — 080 80 — — 090 90 — — 100 100 — — 110 110 — — 130 125 — — 150 145 — — 170 160 — — 190 180 — — 210 200 — — 230 220 150 080 245 230 150 090 255 240 150 100 270 260 170 100 290 280 190 110 315 300 210 110 330 325 170 170 360 350 190 190/170* 390 380 210 190 420 400 210 210 *60 Hz units/50 Hz units. The Flotronic II control system cycles compressor unloaders and/or compressors to maintain the selected leaving fluid temperature set point. It automatically positions the EXV to maintain the specified refrigerant superheat entering the compressor cylinders. It also cycles condenser fans on and off to maintain suitable head pressure for each circuit. 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 test program that allows the operator to check output signals and ensure components are operable. The control system consists of a processor module (PSIO), a low-voltage relay module (DSIO-LV), 2 EXVs, an EXV driver module (DSIO-EXV), a 6-pack relay board, a keypad and display module (also called HSIO or LID), thermistors, and transducers to provide inputs to the microprocessor. A standard options module (SIO) is used to provide additional functions. See Fig. 1 for a typical 30GN Control Panel. MAJOR SYSTEM COMPONENTS Processor Module — This module contains the operating software and controls the operation of the machine. It continuously monitors information received from the various transducers and thermistors and communicates with the relay modules and 6-pack relay board to increase or decrease the active stages of capacity. The processor module 2 7 8 9 4 5 6 1 2 3 – 0 • STAT EXPN HIST CLR SCHD SRVC SET TEST ENTR FUSE 1 LOC AL/ ENABLE SW1 STOP CCN FUSE 3 FUSE 2 F U SE FU SE F USE CB5 CB6 EQUIP GND 99NA505322 D COMM 1 COMM 3 PWR X X S1 S2 X X POINT NUMBER OF FIRST CHANNEL COMM 3 PWR EXV LV STATUS COMM STATUS COMM 2 1 4- 3+ HK35AA002 Potter & Brumfield CZ770 5VDC GFI - CO ( 5 AMP MAX ) 30GT510568 – J5 J4 J4 LEGEND CCN — Carrier Comfort Network TB — Terminal Block Fig. 1 — 30GN Control Panel (040-110 Unit Shown) 3 also controls the EXV driver module (as appropriate), commanding it to open or close each EXV in order to maintain the proper superheat entering the cylinders of each lead compressor. Information is transmitted between the pro...