Carrier 52S manual Description of Switch Settings, NON-USER Adjustable Switches

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DESCRIPTION OF SWITCH SETTINGS

OFF BUTTON Ð The OFF button terminates unit operation.

FAN ONLY BUTTON Ð Push button for air circula- tion without heating or cooling.

HIGH HEAT OR HIGH COOL Ð Push button and

rotate temperature knob to desired comfort level. This function provides maximum heating or cooling, and is recommended to raise or lower the room temperature quickly.

LOW HEAT OR LOW COOL Ð Push button and ro- tate the temperature knob to desired comfort level. This function provides minimum heating or cooling with maximum dehumidi®cation. This setting also allows for very quiet fan operation.

FINDING TEMPERATURE SETTING FOR COM- FORT LEVEL Ð Set temperature knob between num-

ber 5 and number 6. Push High or Low Heat or Cool button and allow unit to run for 15 to 30 minutes. If room is not comfortable, turn knob one number setting at a time. When room is comfortable, keep control knob at that position.

A. 52S COOLING ONLY UNIT

NON-USER ADJUSTABLE SWITCHES

OUTSIDE OR VENT AIR Ð Push the FAN ONLY

button and slide vent lever to OPEN position.

FAN CYCLE Ð The fan cycle switch allows the fan to operate in 2 modes:

CON Ð Fan runs continuously, circulating air even when the temperature setting has been satis®ed. This helps to maintain the room temperature closer to the thermo- stat setting.

CYC ÐFan cycles on and off with the compressor dur- ing heating or cooling. Fan stops when the temperature setting is satis®ed. This results in longer unit off-time and slightly larger variations in room temperature and humidity.

Units built after the start of 1996 incorporate single- pole, double-throw fan cycle switches that have only 3 terminals. Units built prior to 1996 incorporate a double- pole, double-throw fan cycle switch with 6 terminals and a thermostat bulb heater. The additional terminals control the thermostat bulb heater.

OUTDOOR THERMOSTAT (52SQ Units Only) Ð

The outdoor thermostat has 2 operating modes. The heat pump mode (selector screw set fully clockwise), allows the unit to operate normally in the reverse cycle mode. The electric heat mode (selector screw set fully coun- terclockwise), disables all compressor operating modes, both heating and cooling.

B.52S COOLING/HEATING UNIT

C.52S COOLING/HEATING UNIT WITH REMOTE CONTROL (BLANK PLATE)

FIGURE 48 Ð SAMPLE CONTROL PANELS

CLOSED

VENT

OPEN

HEAT

PUMP

ELECTRIC

HEAT

CON

CYC

VENT

LEVER

OUTDOOR THERMOSTAT (ON HEAT PUMP ONLY)

FAN CYCLE SWITCH (NOT ON RC UNITS)

FIGURE 49 Ð CONTROLS LOCATION

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Contents Contents Service Technician GuideSummary of DANGERS, WARNINGS, and Cautions IntroductionModel Number Nomenclature To Disconnect Power for CORD- Connected Unit General DisassemblyTo Open the Control BOX To Remove the Unit from the Wall SleeveDuct Extension Screws Removing the AIR Baffle To Access INDOOR-AIR Section ComponentsTo Remove the TOP Cover Ð Remove the screw To Remove the AIR Discharge GrilleTo Remove the Discharge Deck To Access OUTDOOR-AIR Section ComponentsTo Remove the Gusset Removing Stator Cleaning and Safety General CleaningComponent Cleaning Schedule Consider the following safety issues before beginningCleaning the Indoor AIR Filter Ð Remove Monthly CleaningReplacing the Indoor AIR Filter Ð Access Tools NeededReplacing the Vent AIR Filter Cleaning the Vent AIR FilterChassis Accessing the Indoor and Outdoor Seasonal CleaningDisconnect ALL Power to Unit Accessing the Indoor FAN and Indoor Cleaning the Indoor and Outdoor CoilsCoils section Section Components onDisconnect ALL Power to the Unit Cleaning the Indoor FAN and FANCleaning the Heater Assembly Ð Once Rotary Compressor Components CompressorBasic Hermetic Compressor Electrical Measurements Compressor TroubleshootingBasic Compressor Troubleshooting Guide SHORTED/OPEN Windings Test Compressor ReplacementRemoving the Compressor Ð Follow the steps Disconnect all power to unitRefrigerant Charging Ð Every mechanical Installed Filter DrierCommon Causes Heater Failure HeatersHeater Removal Removing Heater Screws Typical 52S Unit Operating Controls Operating ControlsNON-USER Adjustable Switches Description of Switch SettingsHigh Heat or High Cool Ð Push button Outside or Vent AIR Ð Push the FAN onlyHEAT/COOL Units Figure Sequence of OperationCooling only Units Figure Heat Pump Units FigureTools Needed Component Operation and TroubleshootingIndoor Thermostat Heat Pump Units Outdoor Frost Thermostat Heat Pump Units Indoor Thermostat IT CONTACTS, ALL 52SQ AA and CP ModelsCapacitor Test Locked OUTOutdoor Frost Thermostat Screws Electrical Components Removal and ReplacementComponent Locations Open Control BOX FAN Motor FAN Motor TroubleshootingBasic FAN Motor Electrical Tests Typical 265 Volt Motors FAN Motor Troubleshooting Chart Typical 208/230 Volt MotorsRemoval FAN Motor ReplacementField Temperature Charts 52S Series Page 52S Series Page 52S Series Page 52S Series Page 52S Series Page 52S Series Page 52S Series Page 52S Series Wiring Schematic 52SC Ð 208/230 V and 265 V AA and CP Units Wiring SchematicsWiring Schematic 52SE Ð 208/230 V and 265 V AA and CP Units Wiring Schematic 52SE Ð 208/230 V and 265 V RC Units Wiring Schematic 52SQ Ð 208/230 V and 265 V AA and CP Units Wiring Schematic 52SQ Ð 208/230 V and 265 V RC Units Most Frequent Ptac Service Questions
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