Lennox International Inc Dave Lennox Signature Collection XP17 System HEAT PUMPS, 506586-01 S S

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MULTI−FUNCTION TEST PINS (E33)

Placing the jumper on the field test pins (E33) using a specific sequence allows the technician to:

S S S S

Clear short cycle lockout

Clear five−strike fault lockout

Cycle the unit in and out of defrost mode

Manually place the unit in defrost mode to clear the coil

WhenY1 is energized and 24V power is being applied to the heat pump control (A175), a test cycle can be initiated by placing a jumper on the heat pump control’s TEST pins for 2 to 5 seconds. If the jumper remains on the TEST pins (E33) for longer than five seconds, the heat pump control will ignore the jumpered TEST pins and revert to normal operation.

The heat pump control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one second and then reapplied.

Y1 Active

Place a jumper on TEST pins for longer than one second but less than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable. No other functions will be executed and unit will continue in the mode it was operating.

Place a jumper on TEST pins for more than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable.

ACTIVE

O Line Status

INACTIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

If in COOLING Mode

If in DEFROST Mode

If in HEATING Mode

No further test mode operation will be executed until the jumper is removed from the TEST pins and reapplied.

The unit will terminate defrost and enter HEAT MODE uncalibrated with defrost timer set for a maximum 34 minute test.

If no ambient or coil sensor fault ex- ist, unit will go into DEFROST MODE.

If ambient or coil faults exist (open or shorted), unit will remain in HEAT MODE.

NOTE eat pump control c annot be force into defrost mode when the ambient temperature input from the RT13 sensor is above 65ºF (18ºC).

NOTEault is detected, the board will not execute the TEST mode.

If jumper on TEST pins remains in place for more than five seconds.

The unit will return to HEAT MODE un−calibrated with defrost timer set for 34 minutes.

If jumper on TEST pins is removed before a maximum of five seconds.

The unit will remain in DEFROST MODE until termination on time or

temperature.

Figure 27. Test Pin (E33) Functions

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XP17 SERIES

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Contents Heat Pumps Table of ContentsGeneral Base with Elongated Legs Unit Dimensions −− Inches mmSide View Access View Model Number IdentificationControl BOX Typical Unit Parts ArrangementShipping and Packing List Using Manifold Gauge SetOperating Service Valves Reinstall Stem Cap Operating Angle Type Service ValveOperating Ball Type Service Valve To Access Service Port2CONNECT Manifold Gauge SET Recovering Refrigerant from Existing System1DISCONNECT Power Recovering RefrigerantUnit Placement Placement, Slab Mounting and Stabilizing Unit Detail a Outside Unit PlacementRoof Mounting Removing and Installing PanelsStabilizing Unit on Uneven Surfaces Detail D Detail a Louvered Panel InstallationLouvered Panel Removal Detail CRefrigerant Line SET New or Replacement Line SetRefrigerant Line SET Alling Horizontal Runs Refrigerant Line SET From Vertical to HorizontalBrazing Connections 2CAP and Core Removal 1PIPING Panel Removal and Preparing Line SET7PREPARATION for Next Step Wrap Service ValvesFlow Nitrogen Braze Line SETFlushing Line Set and Indoor Coil Flushing Line Set and Indoor CoilEqualizer Line Installation Installing Indoor Expansion ValveIndoor Expansion Valve Installation Sensing Bulb InstallationLeak Test Leak Test Line Set and Indoor CoilS S S S Evacuating Line Set and Indoor Coil24VAC Transformer Size Circuit and Install Disconnect2INSTALL Thermostat Electrical4ROUTE High Voltage and Ground Wires 3A. Route Control Wires TingRoute Control Wires Ting Typical XP17 Wiring Heat Pump Control AGE Heat Pump Control A175 Jumpers and TerminalsHeat Pump Control A175 Jumper and Terminal Descriptions Flat metal jumper Field Control WiringFurnace Control System Refrigerant Connections for Testing and ChargingServicing Units Delivered Void of Charge Unit Start−UpAirflowindoor Coil Cooling Mode Indoor Airflow CheckHeating Mode Indoor Airflow Check Adding or Removing RefrigerantSubcooling Charging Method Using HFC−410A Weigh In MethodAir Handler / Coil Match ups and Targeted Subcooling Values Psig Operating and Temperature PressuresDefrost System System OperationsUnit Sensors Resistor Location Sensor Temperature / Resistance RangeYES Defrost Calibration Sequence of OperationsS S Test Pin E33 FunctionsOr below Low Pressure S87 Switch OperationHigh Pressure Switch S4 Sequence of Operation Input Fault or Miswire Degrees Resistance Fahrenheit 136.3 2680 DS15 and DS13 Ault Lockout LED Codes System Status, Fault and Lockout LED CodesDS11 and DS14 ATUS, Fault Lockout LED Codes Resetting Fault and Lockout LED CodesModerate Device Alert Status225ºF 107ºC Lockout Vice removed or Clears after FAN Motor Control A177 OPERATION, Field Configuration and TestingTroubleshooting FAN Motor B4 Test ProcedureFan Motor Control Flash and Pause Durations Fan Motor Control Error/Fault LED CodesFan Motor Control Stage LED Indicator Codes Fan Motor Control RPM, LED Code and DC Voltage OutputDemand Begins TOP Grille or FAN Motor Mount Adjustment for FAN ClearanceTOP Grille Adjustment FAN Motor Position AdjustmentFAN Motor Control A177 PULSE−WIDTH Modulation PWM Testing for External Power to Fan Motor Control Finish StripStart TerminalSnow Guard Top Cover MaintenanceHomeowner SunSource Home Energy System START−UP Checks XP17 Start−Up and Performance ChecklistCooling Mode Heating Mode