Sanyo XS1852, C1852, CL1852 service manual Processes and Functions, Room Temperature Control

Page 27

10. PROCESSES AND FUNCTIONS

(1)Room Temperature Control

The Unit adjusts room temperature by turning the outdoor unit’s compressor ON and OFF. This process is controlled by the thermostat located in the remote control unit.

The figures on this and the next pages show how each part of the system performs when the room temperature changes and the thermostat activates the compressor to start (thermo ON) or stop (thermo OFF). Fig. 8 shows about the cooling cycle.

ROOM TEMPERATURE

WITHIN 3 MINUTE

MORE THAN 3 MINUTES

S. T.+ 1°F

 

 

 

 

SET TEMP. T°F

THERMO ON

 

THERMO ON

(S.T.)

 

 

 

 

 

THERMO OFF

MORE THAN

THERMO OFF

 

 

3 MINUTES

 

 

 

5 MINUTES

 

 

ON

OFF

ON

OFF

ON

COMPRESSOR

 

 

 

 

SET SPEED (MANUAL)

INDOOR FAN

ON

OFF

ON

OFF

ON

OUTDOOR FAN

Fig. 8 1028_X_S

Chart Summary and Explanations

Once the compressor starts, it keeps running for 5 minutes.

Once the compressor stops, it will not start running again for 3 minutes.

If you change the operation mode during the cooling cycle, the control circuit stops the compressor for 3 minutes.

For 5 minutes after the compressor is first turned on, and for 3 minutes after it is turned off, the compressor is not controlled by the room sensor.

Thermo ON: When room temperature rises 1 °F above the set temperature T˚, (T ˚+1 °F):

Compressor ON

Thermo OFF: When the room temperature is equal to or below the set temperature T˚: Compressor OFF

SM830079

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Contents Indoor Unit Outdoor Unit XS1852 C1852 Technical DataIf Necessary, Get Help Please Read Before StartingTable of Contents Introduction Read Me First Operating Range XS1852 / C1852XS1852 / CL1852 Unit Specifications SpecificationsData Subject to Change Without Notice Fan motor Major Component Specifications Indoor UnitCompressor Major Component Specifications Outdoor UnitModel No XS1852 Power Transformer Other Component Specifications Indoor UnitModel No CL1852 Other Component Specifications Outdoor UnitIndoor Unit XS1852 Dimensional DataOutdoor Unit C1852, CL1852 230V Performance ChartsModel XS1852 AIR Throw Distance ChartRefrigerant Flow Diagram Insulation of Refrigerant TubingTo prevent heat loss and wet floors due to dripping Tubing Length Installation InstructionsAvoid Selecting the Installation SiteÃInstall the outdoor unit Choose a place that is well ventilatedBaffle Plates for the Outdoor Unit CL×× models only Electrical Wiring General Precautions on Wiring Models Wiring System DiagramElectrical Data Electrical Wiring Diagrams Electric Wiring Diagram Schematic Diagram Outdoor Unit C1852 Outdoor Unit CL1852 Processes and Functions Room Temperature ControlDrain Pump Control Freeze PreventionMedium Service Procedures 1334XS There is a possibility of short circuit Check remote control unitCheck Operation selector switch in the indoor unit Transformer in indoor unitCheck. auxiliary relay FMI Check fuse on the P.C.B. Ass’y in the indoor unitCheck Cool / FAN selector switch in the remote control unit Check set temperatureOutdoor Unit does not Run Check compressor motor magnetic contactor Check float switch Refer to 11 Drain Pump ControlIndoor fan does not run Indoor Unit does not RunIndoor fan and louver motor do not run Some Part does not OperateOutdoor Fan does not Run Outdoor Fan does not Run for CL1852Compressor does not Run Excessive Cooling Poor CoolingOperation of Major Electrical Parts Room temp. Sensor in the remote control unit is defectiveMeasurement of Insulation Re- sistance for Electrical parts Power Supply WiresCompressor motor thermal protector . . . . . . Outdoor unit Checking the Protective DevicesMotor capacitor Both in indoor and outdoor unit Indoor fan motor FMI Indoor unit Measure the coil resistanceThermistor Characteristic Curve Continuity of fuse on P.C.B. Ass’yMethod Used to Replace Fuse on PCB Ass’y Central Region
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