Assessments - , GPA:
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Fabricante : Carrier
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Arquivo Nome : 30gn-2t.pdf
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Remember to reconfigure the chiller for each feature selected (see Table 13). For temperature reset, demand limit, and dual set point, desired set points must be entered through keypad and display module (see Set Point Function section on page 39). See Table 17 for overall troubleshooting information. LEGEND EEM EEM Communications Bus Power Fig. 22 4 In/4 Out Module (SIO) 66 Table 17 - Troubleshooting SYMPTOMS CAUSE REMEDY COMPRESSOR DOES Power line open Reset circuit breaker NOT RUN Control fuse open Check control circuit for ground or short. Replace fuse High Pressure Switch (HPS) Move LOCAL/ENABLE-STOP-CCN switch to STOP tripped position then back to RUN or CCN position. Tripped power breaker Check the controls. Find cause of trip and reset breaker Loose terminal connection Check connections Improperly wired controls Check wiring and rewire. Low line voltage Check line voltage. Determine location of voltage drop and remedy deficiency Compressor motor defective Check motor winding for open or shot-t. Replace compressor if necessary. Seized compressor Replace compressor. COMPRESSOR CYCLES OFF Loss of charge Repair leak and recharge ON LOW PRESSURE Bad transducer Replace transducer. Low refrigerant charge Add refrigerant. COMPRESSOR SHUTS DOWN High-pressure control erratic in action Replace control ~N&-l;l;PFlESSURE Compressor discharge valve partially closed Open valve or replace if defective. Condenser fan(s) not operating Check wiring. Repair or replace motor(s) if defective. Condenser coil oluaaed or dirtv Clean coil. UNIT OPERATES LONG OR Low refrigerant charge Add refrigerant, CONTINUOUSLY Control contacts fused Replace control Partially plugged or plugged expansion Clean or replace valve or filter driver Defective insulation Replace or repair. Service load Keep doors and windows closed. Check valves. Replace if necessary. SYSTEM NOISES Piping vibration Support piping as required Expansion valve hissing Add refrigerant. Check for plugged liquid line filter drier. Compressor noisy Check valve plates for valve noise. Replace compressor (worn bearings). Check for loose compressor holddown bolts. COMPRESSOR LOSES OIL Leak in system Repair leak. Mechanical damage (blown piston or Repair damage or replace compressor. broken discharge valve) Crankcase heaters not energized Replace heaters, check wiring and durina shutdown crankcase heater relay contacts. FROSTED SUCTION LINE Expansion valve admitting excess Check cooler and compressor thermistors. refrigerant Test EXV. HOT LIQUID LINE Shortaae of refriaerant due to leak Repair leak and recharge FROSTED LIQUID LINE Shutoff valve partially closed or restricted Open valve or remove restriction. COMPRESSOR DOES NOT Burned out coil Replace coil UNLOAD Defective capacity control valve Replace valve Miswired solenoid Rewire correctly. Weak, broken, or wrong valve body spring Replace spring fgF;RESSOR DOES NOT Miswired solenoid Rewire correctly Defective capacity control valve Replace valve. Plugged strainer (high side) Clean or replace strainer. Stuck or damaged unloader piston or Clean or replace the necessary parts. piston ring(s) 67 ACCESSORY UNLOADER INSTALLATION Some of the 30G FlotronicT” II units come standard with unloader(s), and many permit additional unloader(s) to be added if desired. See Table 18. IMPORTANT: Accessory hot gas bypass cannot be installed with accessory unloaders on units with more than 4 compressors. If accessory unloaders are desired, an accessory unloader package is used. Package includes a suction cutoff unloader head package. The 24-v coil in the package can be used for 040-l 10, 130 (60 Hz) and associated modular units. A 115 v or 230 v coil must be used for 130 (50 Hz), 150-210, 225, 250, 280, and associated modular units. Coil voltage depends on control circuit voltage, Consult current Carrier price pages for appropriate part numbers. NOTE: The accessory package will include all necessary components and wiring with the following exceptions: The field must provide screws, and on the 130-2 10, 225, 250, 280, and associated modular units, the field must also supply a 20 vdc (part number HK356ABOOl) unloader relay and wire (90” C or equivalent). Table 18 Standard and Accessory Unloaders I 1 NO. OF ACCESSORY Circuit A Circuit B 1 1 or2 1 1 30GN190-210* 0 3OGT225,250,280 0 1 1 1 1 *And associated modular units Installation 1. Be sure all electrical disconnects are open and tagged before any work begins. Inspect the package contents for any damage during shipping. File a claim with the shipper if damage has occurred. 2. For ease of installation, factory-supplied wiring for the additional unloader is provided in the compressor harness. 3. Install the additional unloader cylinder head on the lead compressor, Al or El, according to instructions provided by the compressor manufacturer in the accessory package. 4. Continue installation per either 040-l 10, 130 (60 Hz) units or 130 (50 Hz), 150-210, 225, 250, and 280 units section as appropria...