Carrier T--298 service manual Check Thermostat Operation

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NOTE

If the FAN button is pressed again or if no button is pressed for two minutes, the thermostat will exit the configuration mode and return to nor- mal operation. To re--enter the configuration mode, the FAN button must be pressed and held for 10 seconds again.

While in the configuration mode, the following options are available:

A. ANTICIPATOR -- Value Adjustment

This adjustment controls the sensitivity and cycle rate of the thermostst. Higher numbers decrease the sensitivity and slow the cycle rate. Lower numbers increase the sensitivity and increase the cycle rate. However, a limiting feature will not allow more than 4 equipment cycles per hour, regardless of setting. Values can range from 1 to 3. Factory default setting is 2. This default selection will provide optimum performance in nearly all installations. Try it first. Do not change settings unless there is evidence of need to do so. Unlike conventional anticipators, this setting is not determined by current draw. There is no need to measure, know, or compensate for current.

To Adjust:

a.Enter configuration mode (if not already there).

b.Use UP & DOWN buttons to display A.

c.Press MODE button once to display current value.

d.Use UP & DOWN buttons to move between values.

e.Press MODE buttonto return to A. UP & DOWN buttons now move between option choices A, d, oF or press FAN button to exit configuration mode.

c.Press MODE button once to display offset value.

d.Use UP & DOWN buttons to select a value between --5 and 5.

e.Press MODE buttonto return to oF. UP & DOWN buttons now move between option choices; or press FAN button to exit configuration mode.

3.10 CHECK THERMOSTAT OPERATION

3.10.1 Fan Operation (Cool Only)

1.Press FAN button, starting fan operation. FAN an- nunciator turns on; Lo is displayed in the room tem- perature area for 5 seconds indicating Fan Low Speed.

2.Press FAN button, FAN annunciator remains on; Hi is displayed in room temperature area for 5 seconds indicating Fan High Speed.

3.Press FAN button, stopping fan operation. FAN an- nunciator turns off.

3.10.2 Fan Operation (Heat/Cool)

1.Press FAN button, starting low fan (Lo) operation. FAN annunciator turns on.

2.Press FAN button, starting high fan (Hi) operation. FAN annunciator remains on.

3.Press FAN button, stopping fan operation. FAN an- nunciator turns off.

3.10.3 Cooling Operation (Cool Only)

1.Press and release MODE button until COOL is dis- played.

d. Fahrenheit/Celsius Selection

This selection operates the thermostat in either Fahrenheit or Celsius.

To Select:

a.Enter configuration mode (if not already there).

b.Use UP & DOWN buttons to display d.

2.Press DOWN button until LCD readout reads 10 de- grees below room temperature. Cooling and High Fan system should begin to operate within 5 min- utes.

3.10.4 Cooling Operation (Heat/Cool)

1.Press and release MODE button until COOL is dis- played.

c.Press MODE button once to display current selection of F or C.

d.Use UP & DOWN buttons to change between F & C.

e.Press MODE buttonto return to d. UP & DOWN buttons now move between option choices; or press FAN button to exit configuration mode.

oF. Room Temperature Offset Adjust Selection

The selected number is the number of degrees, plus or minus, which will be added to the actual temperature. The numbers can range between --5 and +5. Factory default is 0. This adjusted value will be used as actual temperature for both display and control action. The effect is that a positive number selection will make the room temperature lower, and vice versa. The thermostat is calibrated within an accuracy of plus or minus 2 degrees when shipped from the factory; this adjustment will provide the best accuracy when set to o.

To Select:

a.Enter configuration mode (if not already there).

b.Use UP & DOWN buttons to display oF .

T--298

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2.Press DOWN button until LCD readout reads 10 de- grees below room temperature. Cooling and High Fan system should begin to operate within 5 min- utes.

3.10.5 Heating Operation (Heat/Cool)

1.Press and release MODE button until HEAT is dis- played.

2.Press UP button until LCD readout reads 10 degrees above room temperature. Heating system should begin to operate within 1 minute.

3.11 CHECK THERMOSTAT OPERATION

3.11.1 Temperature Display

The thermostat will display room temperature until the UP or DOWN button is pressed. The word SET appears when these buttons are pressed and the current set point is displayed. If no buttons are pressed for 5 seconds, the display will change back to show room temperature.

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Contents Model AirV AirV Safety Summary General Safety NoticesOperating Precautions Maintenance PrecautionsSpecific Warning and Caution Statements Specific Warnings and CautionsSafety 298 Table of Contents Table of Contents List of Figures Figure NumberList of Tables Table NumberSection Description IntroductionSerial Number Identification Design Change DescriptionsUpper Unit Roof Ceiling UnitMANUAL--FORM no Equipment Covered Type of Manual Additional Support ManualsFor Part no Ceiling Unit Component Identification Free--Blow Component Identification -- Low Profile -- Upper Unit Component Listing--Ceiling Unit For Ducted Systems Supply AIR Return AIRFree Blow Type START--UP CationsRefrigerant CYCLE--STANDARD System Refrigerant Flow Schematic -- Heat Pump -- Cool Mode Cooling Refrigerant Cycle -- Heat PumpPage Section Troubleshooting Heater Cycles on Limit Switch HEAT/ Cool Version only Insufficient COOLING, Cooling AIR not AdequateCondenser AIR not Adequate Insufficient CoolingClearing Diagnostic Alarms Inadequate Heat HEAT--PUMPPriority Malfunction Preventative Maintenance Section Service and MaintenanceService -- General Ceiling Grill -- Free Blow 3.3.3 Ceiling Panel Removal Indoor Thermostat Removal Indoor Thermostat 3.3.7 Air Sweep RemovalCeiling Unit -- Ducted Systems Control Box Assembly RemovalFilter Removal PCB Display Removal Service -- Upper Unit -- STANDARD, HC & HPFuse Removal Compressor Replacement 15 Control BoxUpper Scroll Assembly Removal 19 Motor AssemblyAir Handling System Removal 23 Blower WheelLine Voltage -- 10% 27 Upper Scroll Assembly Locking Tabs b. & Screw Locations c 30 Condenser Fan Assembly Retaining Ring Condenser Motor Removal 34 Evaporator Motor Locking TabsCapacitor Removal Change from Fahrenheit to Celsius willBe permanent. It cannot be changed back to Fahrenheit38 Remote Control Components SET Thermostat Configuration LCD DisplayCheck Thermostat Operation Upper Unit Powerbox AssemblyThermostat Thermostat Powerbox Assembly Ac to ry Wiri ng Fie ld Wiri ngSection Wiring Schematics Upper Unit Schematic -- Standard & HCCeiling Unit Schematic -- Cooling Only Heat Pump -- Ceiling Unit -- Free Blow Heat Pump -- Upper Unit -- Ducted 10 Ceiling Unit -- Wall Thermostat -- Ducted & Free Blow Wall Mounted ThermostatsIndex Ceiling Unit -- Ducted Systems Ceiling Unit -- Free Blow