User manual CARRIER INTEGRA 30S SERVICE MANUAL

[. . . ] OPERATION AND SERVICE MANUAL INTEGRA 30S TRUCK REFRIGERATION UNIT BEGINNING WITH S/N PB 225225 TABLE OF CONTENTS PARAGRAPH NUMBER Page GENERAL SAFETY NOTICES . 1-12 i 62--10848 TABLE OF CONTENTS (Continued) PARAGRAPH NUMBER OPERATION . 62--10848 ii Page 2-1 2-1 2-1 2-1 2-1 2-2 2-2 2-3 2-3 2-3 2-3 2-3 2-4 2-4 2-5 2-5 2-5 2-5 2-6 2-6 2-7 3-1 3-1 3-1 3-1 3-2 3-2 4-1 4-1 4-2 4-2 4-2 4-2 4-2 4-3 4-3 4-3 4-3 4-4 4-4 4-4 4-4 SERVICE . . TABLE OF CONTENTS (Continued) PARAGRAPH NUMBER Page SERVICE (Continued) . [. . . ] 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. This feature determines heating mode operation based on the presence of a condenser pressure control valve. Since all 30S units covered by this manual have a condenser pressure control valve installed, 3ET must be selected. Selection MUST be validated by pressing the SET key. NOTE If no buttons are depressed within 5 seconds of pressing the Defrost and On Keys (Step 2 of the above procedure) or modifying parameters, the Cab Command reverts to box temperature display and the configuration procedure is aborted. The defrost interval can be selected by scrolling through available options. Settings are for either automatic defrost (AUT) or fixed time intervals between 1 to 6 hours. The next steps must be performed with the unit ON: 2-7 WARNING Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor unexpectedly as control requirements dictate. 62-10848 SECTION 3 TEMPERATURE CONTROL 3. 1 SEQUENCE OF OPERATION General operation sequences for cooling, null, and heating are provided in the following paragraphs. The microprocessor automatically selects the mode necessary to maintain box temperature at setpoint. 3. 1. 1 Perishable Mode The unit operates in the perishable mode with set points above 10°F (--12°C) a. With return air temperature above setpoint and decreasing, the unit will be cooling with the compressor and evaporator fans operating. (See Section 1. 8. 1 for a description of the refrigeration circuit during cooling) The condenser fan will operate for the first three minutes after start up then operate under the control of the condenser pressure control switch (HP2). The green unit operating LED will operate in accordance with Figure 2-2 or Figure 2-3. If discharge temperature increases to the setpoint of the quench thermostat (BPT), the thermostat will close, energizing the quench valve (BPV). This will allow liquid into the suction line in order to cool compressor. Once the discharge temperature decreases to the certainty of the PPT, the thermostat will open, DE--energizing the PP. Once temperature decreases to the certainty, the unit will enter the null mode. [. . . ] Bent or dented enclosing tube Valve shifts but refrigerant Foreign material lodged under seat continues to flow Defective seat 5. 2. 12 Standby Compressor Malfunction Motor contactor defective Standby compressor fails to start Motor Overload open Improper power supply 5­minute timer active Standby motor starts, then stops Motor Overload open Low superheat and liquids lugging in compressor Tighten 4. 9 4. 9 5. 2. 10 Check Check Check Check POSSIBLE CAUSES REFERENCE SECTION Replace Replace Check Check 4. 18 Check Check Check Replace 4. 7. 1 Repair Repair 4. 15. 2 4. 15. 2 Repair 4. 15 4. 15 Replace 4. 15. 2 4. 15. 2 Check Check 4. 13 4. 13 Replace Check Correct Check Check 62-10848 5-4 SECTION 6 ELECTRICAL SCHEMATIC WIRING DIAGRAM 6. 1 INTRODUCTION This section contains Electrical Schematic Wiring Diagram covering the Models listed in Table 1-1. The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein. WARNING Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor unexpectedly as control requirements dictate. [. . . ]