Sanyo C1852, XS1852, CL1852 service manual Freeze Prevention, Drain Pump Control

Page 28

10. PROCESSES AND FUNCTIONS

(2)Freeze Prevention

Freeze Prevention keeps the indoor heat exchange coil from freezing. Freezing reduces the efficiency of the unit, and frost buildup on the coil blocks cool air circulation from the indoor

unit’s fan.

FREEZE

FREEZE

 

PREVENTION

PREVENTION

MORE THAN 10 MINUTES

6 MINUTES

10 MINUTES

6 MINUTES

INDOOR COIL

 

 

 

TEMPERATURE

 

 

 

30°F

 

 

(THERMO ON)

 

 

 

(THERMO OFF)

COMPRESSOR

ON

OFF

ON

OFF

ON

OUTDOOR FAN

ON

OFF

ON

OFF

ON

INDOOR FAN

SET SPEED

1029_X_S

Fig. 9

(3)Drain Pump Control

Drain pump operates when compressor starts to operate or when Float Switch turns off.

FLOAT SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

OFF

 

 

 

ON

 

 

ON: low water level

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF: high water level

 

 

 

 

 

 

 

 

 

 

 

 

20 MINUTES

 

 

 

 

 

 

 

COMPRESSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

ON

 

 

 

 

 

 

 

ON

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRAIN PUMP

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTDOOR FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

OFF

 

 

 

 

ON

 

ON

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

INDOOR FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SET SPEED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0609_X_S

Fig. 10

SM830079

– 28 –

Image 28
Contents Technical Data Indoor Unit Outdoor Unit XS1852 C1852Please Read Before Starting If Necessary, Get HelpTable of Contents Introduction Read Me First XS1852 / C1852 Operating RangeXS1852 / CL1852 Specifications Unit SpecificationsData Subject to Change Without Notice Major Component Specifications Indoor Unit Fan motorMajor Component Specifications Outdoor Unit CompressorOther Component Specifications Indoor Unit Model No XS1852 Power TransformerOther Component Specifications Outdoor Unit Model No CL1852Dimensional Data Indoor Unit XS1852Outdoor Unit C1852, CL1852 Performance Charts 230VAIR Throw Distance Chart Model XS1852Insulation of Refrigerant Tubing Refrigerant Flow DiagramTo prevent heat loss and wet floors due to dripping Installation Instructions Tubing LengthSelecting the Installation Site AvoidChoose a place that is well ventilated ÃInstall the outdoor unitBaffle Plates for the Outdoor Unit CL×× models only Electrical Wiring General Precautions on Wiring Wiring System Diagram ModelsElectrical Data Electric Wiring Diagram Electrical Wiring DiagramsSchematic Diagram Outdoor Unit C1852 Outdoor Unit CL1852 Room Temperature Control Processes and FunctionsFreeze Prevention Drain Pump ControlMedium Service Procedures 1334XS Check remote control unit There is a possibility of short circuitTransformer in indoor unit Check Operation selector switch in the indoor unitCheck. auxiliary relay Check fuse on the P.C.B. Ass’y in the indoor unit FMICheck set temperature Check Cool / FAN selector switch in the remote control unitOutdoor Unit does not Run Check float switch Refer to 11 Drain Pump Control Check compressor motor magnetic contactorIndoor Unit does not Run Indoor fan and louver motor do not runSome Part does not Operate Indoor fan does not runOutdoor Fan does not Run for CL1852 Outdoor Fan does not RunCompressor does not Run Poor Cooling Excessive CoolingRoom temp. Sensor in the remote control unit is defective Operation of Major Electrical PartsPower Supply Wires Measurement of Insulation Re- sistance for Electrical partsChecking the Protective Devices Compressor motor thermal protector . . . . . . Outdoor unitIndoor fan motor FMI Indoor unit Measure the coil resistance Motor capacitor Both in indoor and outdoor unitContinuity of fuse on P.C.B. Ass’y Thermistor Characteristic CurveMethod Used to Replace Fuse on PCB Ass’y Central Region
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XS1852, CL1852, C1852 specifications

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