Carrier Infinity 24VNA6 Series Service Manual

Also see for Infinity 24VNA6: Installation instructions Owner's manual

24VNA6 / 25VNA4: Service ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.6Control Connection (Communicating andNon-Communicating)The primary system control interface for the PCM is the communicatingInfinity Control. The PCM also supports traditional 24VAC discretecontrol signals in an emergency mode of operation when acommunicating control is not available.Communicating Infinity ControlThe communicating Infinity Control uses a 2-wire connection as shownin Fig. 3 and Fig. 4. An optional 3rd wire can be added for a groundconnection. The third wire is recommended for long communicationruns or if there are problems encountered with consistent communicationusing a 2-wire setup. The Comm light indicates whether communicationis being received from a system control.A200239Fig. 4 – Infinity Control ConnectionNon-Communicating ControlThe non-communicating control connections are shown in Fig. 5.Specific connections depend on system configuration. Note that O andW are driven during Defrost for heat pump models.A200240Fig. 5 – Non-Communicating Control ConnectionIn non-communicating mode, the Performance Mode and DefrostInterval are set using DIP switches. Switch assignments are shown inFig. 6. Switch settings are shown in the Table 1A200241Fig. 6 – Non-Communicating DIP Switch AssignmentTable 1 – DIP Swtich SettingsIMPORTANT: The R (Rc) signal on the PCM comes from thetransformer in the equipment. The phase of this transformer connectionis not controlled relative to the phase of the transformer in the indoorequipment (Rh). Wiring requirements in this manual do not connect Rcand Rh together. For any non-standard wiring, care should be taken tomake sure that Rc and Rh are not connected together. Doing so mayresult in destroying one or both of the transformers in this and theinternal equipment.PCM Indicators and Matrix DisplayThe PCM contains three indicator lights (LEDs) and a dot matrixdisplay. Indicator and display location is shown in Fig. 7. Theindicators are described briefly below. Indicator operation andinterpretation is described in the Control Features section.Status LightThe status light is a single color amber LED that indicates equipmentoperating status and diagnostic conditions.Comm LightThe Comm light is a single color green LED that indicates thecommunication state and system control state of the equipment.VFD Comm LightThe VFD Comm Light is a bi-color red / green LED that indicates thecommunication with the VFD.Matrix DisplayThe matrix display is a 5x7 dot matrix for displaying messages anddiagnostic information.A B CABGND(optional)OWY2Y1CLLSUTILNON-COMMUNICATINGCONTROL CONNECTIONSNOTE: O should be active in CoolingPerformance ModeDefrost Interval4321ONNot UsedSwitch 1 Switch 2 Defrost IntervalUp Up AutoUp Down 30 minutesDown Up 60 minutesDown Down 90 minutesSwitch 3 Performance ModeUp EfficiencyDown Comfort