User manual CARRIER 30EQAUT

[. . . ] 4-7 4. 13 HOT GAS (HGS1) AND CONDENSER PRESSURE CONTROL SOLENOID VALVES . 4-7 4. 14 ADJUSTING THE COMPRESSOR PRESSURE REGULATING VALVE (CPR) (115V ONLY) . 5-4 5. 2. 11 Malfunction Hot Gas Solenoid or Condenser Pressure Regulating Valve . 6-1 iii 62--10848 LIST OF ILLUSTRATIONS FIGURE NUMBER Figure 1-1 Integra 30S . [. . . ] The minimum setpoint can be selected by scrolling through available options [--20°F (--28. 9°C), --4°F (--20°C), 32°F (0°C)] using the (+) or (--) keys. This setting determines the temperature difference between box temperature and setpoint that controls compressor cycling. The differential can be selected by scrolling through available options [1. 8°F (1°C), 3. 6°F (2°C), or 5. 4°F (3°C)] using the (+) or (--) keys. The ON/OFF (Continuous airflow) parameter for the evaporator fan is displayed next. This feature determines whether the evaporator fan is on or off when the unit cycles off upon reaching setpoint. The return air temperature will be displayed after the above sequence. 62-10848 2-6 2. 9. 2 ROAD/STANDBY FUNCTIONAL SETTINGS The procedure for adjusting the functional parameters is as follows: 1. To set the display to Fahrenheit, move the Celsius end of the jumper to the Fahrenheit pin as shown in Figure 2-4. All keys should be held momentarily after pressing in the correct sequence. Figure 2-4 Temperature Selection Jumper NOTE The board contains another set of pins similar to the Degrees C/Degrees F selection jumper, marked as J1. This jumper is not used for unit operation, but it is used during the microprocessor controller manufacturing process. The following steps must be performed with the unit OFF: Shut-down unit. Once temperature decreases to the certainty, the unit will enter the null mode. If the continuous air flow parameter is set to ON, the evaporator fans will continue to operate with all other components OFF. If the continuous air flow parameter is OFF, the evaporator fans and all other components will be OFF. If temperature increases during the null mode, the unit will restart in cooling. If temperature continues to decrease the unit will enter the heating mode with the compressor and evaporator fans operating and the hot gas solenoid valve (HGS1) energized (open). The condenser fan and condenser pressure control valve (HGS2) will operate under the control of the condenser pressure switch (HP2). If the engine coolant or electric heat option is installed, the optional heaters will also be energized. (See Section 1. 8. 2 for a description of the refrigeration circuit during heat and defrost. ) UNIT STOPPED UNIT STOPPED COOL +1. 8_F (+1_C) or +3. 6_F (+2_C ) or +5. 4_F (+3_C ) SETPOINT --1. 8_F (--1_C) HEAT or --3. 6_F (--2_C) or --5. 4_F (--3_C) (setting) Figure 3-1 Operating Sequence - Perishable Mode 3. 1. 2 Frozen Mode The unit operates in the frozen mode with setpoints at or below 10°F (--12°C). Operation in the frozen mode is the same as in the perishable mode except no heating takes place. COOL +1. 8_F (+1_C ) or +3. 6_F (+2_C ) or +5. 4_F (+3_C ) SETPOINT --1. 8_F (--1_C) or --3. 6_F (--2_C) or --5. 4_F (--3_C) (setting) Figure 3-2 Operating Sequence - Frozen Mode - 3-1 62-10848 3. 2 DEFROST CYCLE Defrost is an independent cycle overriding cooling and heating functions in order to melt frost and ice from the evaporator when necessary. Defrost may be initiated by the microprocessor or manually by the operator once the defrost termination thermostat has closed. In defrost mode, the microprocessor displays "dF" on the cab command and setpoint is no longer displayed. During defrost, the evaporator fans shut down and operation of the condenser fan is controlled by the microprocessor. [. . . ] Failed switch Unit overcharged A02 Low Pressure Switch (LP) or High Pressure Switch ( g (HP1) ) Open O Verify operation of condenser fan Noncondensibles in system Discharge check valve failed closed (standby only Failed switch Thermal overload open in motor windings. Verify line lt V if li voltage Current draw of road clutch coil either high or low Contactor coil either high or low (0. 2A for 3 phase; 0. 5A for 1 phase) Verify plunger moves freely Replace contactor Verify motor rotates freely A03 Standby Electric motor overload Units Only Road Compressor Clutch A04 (CLHR) Malfunction A05 Standby Standby Contactor (MC) high amp draw p Units Only Ol A06 A07 Condenser Fan Motor (CFM) high amp draw Evaporator Fan Motor (EFM) p ( ) high hi h amp d draw Replace ------4. 12 ---------- Verify condition of brushes Replace motor Verify motor rotates freely Replace motor 5-1 62-10848 Table 5-1 Alarm Indications - Continued ALARM A08 Standby Units Only Ol Description CORRECTIVE ACTION Reference Paragraph the hot water control relay or the electric heat contactor coil amp p draw is high d i hi h Check wiring to controls Current draw of coil high or low (approx 1. 6 amp) g ( pp p) Hot Gas Solenoid Valve ( (HGS1) ) A09 high hi h amp d draw Replace coil Current draw of coil high or low (approx 1. 2 amp) Quench Valve (BPV) A10 high amp draw Replace coil Current draw of coil high or low (approx 1. 6 amp) Condenser Pressure Control A11 Valve (HGS2) high amp draw Replace coil Unit out of range for 15 minutes A12 Standby O t of R Out f Range -- High Tempera- Verify cooling operation of unit Hi h T Units ture Hot gas solenoid open Only Unit out of range for more than 15 minutes A13 Standby O t of R Out f Range -- Low Tempera- Verify heating operation of unit L T Units ture Heating option not active (Set configuration) Only Unit terminated defrost after 45 minutes A14 Standby Defrost Cycle > 45 minutes Units Verify HGS1/HGS2 valve operation Only Ol Setpoint adjusted out of the range --20. 2 to 86°F 20. 2 86 F A15 Check setpoint (--29°C/+30°C) or below the programmed low threshold EE Return Air Sensor Return air sensor defective Vehicle battery voltage low bAt Low Battery Voltage Check alternator system If operating on road, disconnect standby power supUsing Road & Standby opera- ply -----tion at the same time time. Reset. Heating option control - Either Verify coil resistance - ------4. 13. 1 ---4. 13. 1 ---4. 13. 1 Verify Setting ---4. 13. 1 Verify Setting ---2. 9 ---4. 13 4 13 2. 3 23 Replace Correct ------2. 3 Table 5-2 Mechanical Indications INDICATION/TROUBLE 5. 2 REFRIGERATION 5. 2. 1 Unit Will Not Cool Compressor drive (clutch) defective Compressor defective Defrost cycle has not terminated Abnormal pressure Refrigeration system Hot gas solenoid malfunction (HGS1) 5. 2. 2 Unit Runs But Has Insufficient Cooling Compressor Compressor defective Abnormal pressure Expansion valve malfunction Refrigeration system Non--existent or restricted evaporator airflow Compressor malfunction Replace 4. 9 5. 2. 5 5. 2. 6 4. 13 4. 9 5. 2. 6 5. 2. 10 5. 2. 9 POSSIBLE CAUSES REFERENCE SECTION 62-10848 5-2 Table 5-2 Mechanical Indications - Continued INDICATION/TROUBLE POSSIBLE CAUSES REFERENCE SECTION Insufficient pull down time Correct 5. 2. 6 5. 2. 8 4. 9 5. 2. 6 5. 2. 8 4. 13 Check 4. 9 Replace 4. 13 2. 5 Replace Replace 4. 13 4. 13 ---2. 5 Replace 5. 2. 3 Unit Operates Long or Continuously in Cooling Hot Load Box Defective box insulation or air leak Refrigeration system Abnormal pressure Temperature controller malfunction Compressor Defective 5. 2. 4 Unit Will Not Heat or Heating Insufficient Abnormal pressure Temperature controller malfunction Refrigeration Hot gas solenoid malfunction (HGS1) Compressor Compressor drive (clutch) defective Compressor defective 5. 2. 5 Defrost Malfunction Defrost thermostat (DTT) open or defective Hot gas solenoid valve malfunction Automatic defrost will not initiate Defrost disabled through cab command Microprocessor defective Manual defrost will not initiate Defrost thermostat (DTT) open or defective Defrost cycle initiates but does Hot gas solenoid malfunction (HGS1) not defrost Condenser Pressure Control valve malfunction (HGS2) Wet load Frequent defrost Defrost settings set to low. Does not terminate or cycles on Defrost thermostats (DTT) shorted closed defrost 5. 2. 6 Abnormal Pressure 5. 2. 6. 1 Cooling Condenser coil dirty Noncondensibles in system High discharge pressure Refrigerant overcharge Condenser fan/motor defective Compressor defective Hot gas solenoid malfunction Low discharge pressure Low refrigerant charge Compressor defective Hot gas solenoid malfunction High suction pressure Compressor pressure regulator misadjusted (CPR) Filter­drier partially plugged Low refrigerant charge Low suction pressure Expansion valve malfunction No evaporator air flow or restricted air flow Excessive frost on coil Suction and discharge pressures Compressor defective tend to equalize when unit is Hot gas solenoid malfunction operating 5. 2. 6. 2 Heating Overcharged system Condenser fan or HP2 pressure switch defective High discharge pressure Noncondensibles in system Condenser motor/fan defective Compressor defective Low discharge pressure Hot gas solenoid valve malfunction Low refrigerant charge Compressor pressure regulating valve misadjusted (CPR) Low suction pressure Condenser Pressure Regulating valve fault (HGS2) 4. 19 4. 8 4. 7. 1 4. 12 4. 9 4. 13 4. 7. 1 4. 9 4. 13 4. 14 4. 10 4. 7. 1 5. 2. 10 5. 2. 9 Check 4. 9 4. 13 4. 7. 1 4. 11 4. 8 4. 12 4. 9 4. 13 4. 7. 1 4. 14 4. 13 5-3 62-10848 Table 5-2 Mechanical Indications - Continued INDICATION/TROUBLE 5. 2. 7 Abnormal Noise Loose mounting bolts Worn bearings Compressor Worn or broken valves Liquid slugging Insufficient oil Loose shroud Bearings defective Condenser or evaporator fan Fan loose on shaft Bent shaft 5. 2. 8 Cab Command Malfunction Fuse open Microprocessor malfunction Cab Command non­operational Microprocessor/Cab command cable 5. 2. 9 No Evaporator Air Flow or Restricted Air Flow Heavy frost on coil Evaporator coil blocked Coil dirty Evaporator fan loose or defective Evaporator fan rotating backwards No or partial evaporator air flow Evaporator air flow blocked in box Fan motor(s) malfunction 5. 2. 10 Expansion Valve Low refrigerant charge External equalizer line plugged Low suction pressure with high Broken capillary superheat Superheat setting too high Superheat setting too low External equalizer line plugged Pin and seat of expansion valve eroded or held open by foreign material Improper bulb location or installation Insulation missing from sensing bulb Fluctuating suction pressure Low superheat setting High superheat Expansion valve setting 5. 2. 11 Malfunction Hot Gas Solenoid or Condenser Pressure Regulating Valve No power to valve Improper wiring or loose connections Valve improperly assembled Coil or coil sleeve improperly assembled Valve does not function properly Movement of plunger restricted due to: a. 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