Carrier Guide to Compressor Internal Overload Reset for 38AKS008 and 38AKS012 Models
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Fig. 9A — Cooling Charging Chart — 38AK008,012

and 38AKS008,009,012 (60 Hz)

Fig. 9B — Cooling Charging Chart — 38AK008,012

and 38AKS008,009,012 (50 Hz)

Compressor Overload — This overload interrupts power to the compressor when either the current or internal motor winding temperature becomes excessive, and automati- cally resets when the internal temperature drops to a safe level. This overload may require up to 60 minutes (or longer) to reset. If the internal overload is suspected of being open, disconnect the electrical power to the unit and check the circuit through the overload with an ohmmeter or continuity tester.

Cycle-LOC™ Device (CLO) — The Cycle-LOC de- vice prevents the compressor from starting or running in a high pressure, loss-of-charge or freezestat open situation. Reset the

Cycle-LOC device by setting the thermostat to eliminate cool- ing demand and return it to the original set point. If the system shuts down again for the same fault, determine the possible cause before attempting to reset the Cycle-LOC device.

Low-Pressure/Loss-of-Charge Switch (LPS) —

When the liquid line pressure drops below 7 psig (48 kPa), the LPS opens 24-v power to the compressor contactor and stops the compressor. When the pressure reaches 22 psig (152 kPa), the switch resets and the compressor is allowed to restart.

High-Pressure Switch (HPS) — When the refriger- ant high-side pressure reaches 426 psig (2937 kPa), the HPS opens 24-v power to the compressor contactor and stops the compressor. When the pressure drops to 320 psig (2206 kPa), the switch resets and the compressor is allowed to restart.

Refrigerant Service Ports — Each unit system has 3 service ports: one on the suction line, one on the liquid line, and one on the compressor discharge line. Be sure caps on the ports are tight.

High Flow Valves — Located on the compressor hot gas and suction tubes are high flow valves. Large black plastic caps distinguish these valves with O-rings located inside the caps. These valves cannot be accessed for service in the field. Ensure the plastic caps are in place and tight or the possibility of refrig- erant leakage could occur.

Cooling — Set space thermostat to OFF position. Set system selector switch at COOL position and fan switch at AUTO. position. Adjust thermostat to a setting below room temperature. Compressor starts on closure of contactor.

Check cooling effects at a setting below room temperature. Check unit charge. Refer to Refrigerant Charge section on page 9.

Reset thermostat at a position above room temperature. Compressor will shut off.

TO SHUT OFF UNIT — Set system selector switch at OFF position. (Resetting thermostat at a position above room tem- perature shuts unit off temporarily until space temperature ex- ceeds thermostat setting.) Units are equipped with Cycle- LOC™ protection device. Unit shuts down on any safety trip and remains off. Check reason for safety trip.

Compressor restart is accomplished by manual reset of the thermostat by turning the selector switch to OFF position and then to ON position.

Sequence of Operation — At start-up, the thermostat calls for cooling. With all safety devices satisfied, the compres- sor contactor and fan contactor energize, causing the compres- sor and outdoor (condenser) fan motor to operate. Contacts close, allowing the field-supplied and -installed indoor (evapo- rator) fan contactor to function. The recommended field- supplied and -installed liquid line solenoid valve will also open, allowing the system to function in cooling. As cooling demand is satisfied, the thermostat contacts break, deenergiz- ing the contactor causing the system to shut off. The liquid line solenoid valve closes, minimizing the potential for refrigerant migration at this time. The compressor does not restart until the thermostat again calls for cooling. The system is protected by a Cycle-LOC device so that the compressor will not start if a high-pressure or low-pressure fault occurs. Compressor restart is accomplished by manual reset of the thermostat by turning the selector switch to OFF position and then to ON position. This should be done only once. If system shuts down due to the same fault, determine the problem before attempting to reset the Cycle-LOC device.

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Contents Safety Considerations ContentsInstallation Refrigerant Compressor Physical Data 50/60 Hz EnglishUnit Condenser CoilPhysical Data 50/60 Hz SI Refrigerant Piping Sizes 60 Hz Weight DistributionRig and Mount the Unit Refrigerant Piping Sizes 50 HzDimensions ft-in Liquid Line Data 50 Hz Make Electrical ConnectionsLiquid Line Data 60 Hz MAX Liquid Line Unit AllowableElectrical Data Field Control Wiring Raceway 38AKS Unit Shown Length Insulation Size Rating C AWGSTART-UP Preliminary ChecksLow-Pressure/Loss-of-Charge Switch LPS Cooling Charging Chart 38AK008,012 38AKS008,009,012 60 HzOil Charge Tables 1A and 1B ServiceCondenser-Fan Adjustment Fig LubricationCondenser-Fan Adjustment Troubleshooting Guide Symptom Cause RemedyGND CAPCLO OFCPreliminary Information START-UP ChecklistII. Pre-Start-Up III. Start-Up Check Voltage Imbalance
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38AK012, 38AKS009, 38AKS012, 38AKS008, 38AK008 specifications

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