Carrier 24APA7 Performance Installation Instructions Manual

Also see for 24APA7 Performance: Product data Wiring diagram

Contents

10OAT Thermistor must belocked in place with sphericalnib end facing towards thefront of the control boxFig. 8 -- Outdoor Air Thermistor (OAT) AttachmentOCT Thermistor must besecured tight on the liquid tube.Fig. 9 -- Outdoor Coil Thermistor (OCT) AttachmentTable 4 – TROUBLESHOOTINGOPERATION FAULTAMBERLEDFLASHCODEPOSSIBLE CAUSE AND ACTIONStandby – no call for unit op-eration NoneOn sol-id, noflashNormal operationLow---stage Cool/Heat Opera-tion None 1, pause Normal operationHigh-stage Cool/Heat Opera-tion None 2, pause Normal operationSystem CommunicationsFailure 16 Communication with user interface lost. Check wiring to User Interface, indoorand outdoor unitsInvalid Model Plug 25 Control does not detect a model plug or detects an invalid model plug. Unitwill not operate without correct model plug.High Pressure Switch Open 31* High---pressure switch trip. Check refrigerant charge, outdoor fan operationand coils for airflow restrictions.Low Pressure Switch Open 32* Low pressure switch trip. Check refrigerant charge and indoor air flowControl Fault 45 Outdoor unit control board has failed. Control board needs to be replaced.Brown Out (230 v) 46 Line voltage < 187v for at least 4 seconds. Compressor and fan operation notallowed until voltage>190v. Verify line voltage.No 230v at Unit 47There is no 230v at the contactor when indoor unit is powered and cooling/heating demand exists. Verify the disconnect is closed and 230v wiring isconnected to the unit.Outdoor Air Temp SensorFault 53 Outdoor air sensor not reading or out of range. Ohm out sensor and checkwiring.Outdoor Coil Sensor Fault 55 Coil sensor not reading or out of range. Ohm out sensor and check wiring.Thermistors out of range 56 Improper relationship between coil sensor and outdoor air sensor. Ohm outsensors and check wiring.Low stage Thermal Cutout 71*Compressor operation detected then disappears while low---stage demandexists. Possible causes are internal compressor overload trip or start relay andcapacitor held in circuit too long(if installed)High stage Thermal Cutout 72*Compressor operation detected then disappears while high---stage demandexists. Possible causes are internal compressor overload trip or start relay andcapacitor held in circuit too long (if installed)Contactor Shorted 73 Compressor voltage sensed when no demand for compressor operationexists. Contactor may be stuck closed or there is a wiring error.No 230V at Compressor 74 Compressor voltage not sensed when compressor should be starting. Contac-tor may be stuck open or there is a wiring error.Low-stage Thermal Lockout 81 Thermal cutout occurs in three consecutive low/ high---stage cycles.low---stage locked out for 4 hours or until 24v power recycled.High-stage Thermal Lock-out 82 Thermal cutout occurs in three consecutive high/low---stage cycles.high---stage locked out for 4 hours or until 24v power recycled.Low Pressure Lockout 83 Low pressure switch trip has occurred during 3 consecutive cycles. Unit oper-ation locked out for 4 hours or until 24v power recycled.High Pressure Lockout 84 High pressure switch trip has occurred during 3 consecutive cycles. Unit oper-ation locked out for 4 hours or until 24v power recycled.* Sequence: Compressor contactor is de-energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.24APA7

/ 12

Related manuals for Carrier 24APA7 Performance