Lennox International Inc 506586-01 Low Pressure S87 Switch Operation, Or below

Page 36

Y1 DEMAND

LOW

 

PRESSURE

CLOSED

SWITCH (S87)

 

COMPRESSOR CONTACTOR ENERGIZED

INITIAL TRIP

SWITCH IS

IGNORED FOR 90 SECONDS

OPEN

OPEN

COMPRESSOR CONTACTOR DE−ENERGIZED

COMPRESSOR ANTI−SHORT CYCLE TIMER BEGINS

INCREMENT

5−STRIKE

COUNTER1

LED ALERT

CODE / OR

MODERATE

ALERT 410

DISPLAYED

ANTI−SHORT CYCLE TIMER ENDS

COMPRESSOR CONTACTOR ENERGIZED

LOW

 

 

 

 

SWITCH IS CLOSED OR OUTDOOR

PRESSURE

 

 

 

 

 

CLOSED

 

 

SWITCH (S87)

 

 

 

AMBIENT TEMPERATURE IS 15ºF

 

 

 

 

 

 

 

 

 

OR BELOW

 

 

 

 

 

 

1If 5−strike counter has four or less strikes when Y1 demand is terminated or satisfied, the strike counter will reset to zero. In a icomfort Touch® thermostat enabled setup, the thermostat will terminate demand when the compressor contactor is de−energized. If demand is satisfied when alarm is not active, the 5−strike counter will reset.

2Lockouts can be reset by either cycling power off to the heat pump con- trol’s (A175) R terminal, or placing a jumper on the field test pins (E33) between 1 to 2 seconds.

5−STRIKE

COUNTER

REACHES 5

WITHIN A SINGLE

Y1 DEMAND

LOW

PRESSURE

SWITCH (S87)

LOCKOUT

LED ALERT

CODE / OR

SERVICE

CRITICALREQUIRED2

ALERT 411

DISPLAYED

SERVICE

REQUIRED2

OPEN

LOW

PRESSURE SWITCH (S87)

WAITING FOR PRESSURE SWITCH TO CLOSE

LED ALERT

CODE / OR

CLOSEDMODERATE ALERT 410

DISPLAYED

CLOSED

NORMAL

OPERATION

Figure 28. Low Pressure (S87) Switch Operation

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506586−01 10/10

Image 36
Contents Table of Contents GeneralHeat Pumps Unit Dimensions −− Inches mm Side View Access ViewModel Number Identification Base with Elongated LegsTypical Unit Parts Arrangement Control BOXUsing Manifold Gauge Set Operating Service ValvesShipping and Packing List Operating Angle Type Service Valve Operating Ball Type Service ValveTo Access Service Port Reinstall Stem CapRecovering Refrigerant from Existing System 1DISCONNECT PowerRecovering Refrigerant 2CONNECT Manifold Gauge SETUnit Placement Detail a Outside Unit Placement Placement, Slab Mounting and Stabilizing UnitRemoving and Installing Panels Stabilizing Unit on Uneven SurfacesRoof Mounting Louvered Panel Installation Louvered Panel RemovalDetail C Detail D Detail aNew or Replacement Line Set Refrigerant Line SETRefrigerant Line SET From Vertical to Horizontal Refrigerant Line SET Alling Horizontal RunsBrazing Connections 1PIPING Panel Removal and Preparing Line SET 2CAP and Core RemovalWrap Service Valves Flow NitrogenBraze Line SET 7PREPARATION for Next StepFlushing Line Set and Indoor Coil Flushing Line Set and Indoor CoilInstalling Indoor Expansion Valve Indoor Expansion Valve InstallationSensing Bulb Installation Equalizer Line InstallationLeak Test Line Set and Indoor Coil Leak TestEvacuating Line Set and Indoor Coil S S S SSize Circuit and Install Disconnect 2INSTALL ThermostatElectrical 24VAC Transformer3A. Route Control Wires Ting Route Control Wires Ting4ROUTE High Voltage and Ground Wires Typical XP17 Wiring Heat Pump Control A175 Jumpers and Terminals Heat Pump Control AGEHeat Pump Control A175 Jumper and Terminal Descriptions Field Control Wiring Flat metal jumperFurnace Control Connections for Testing and Charging Servicing Units Delivered Void of ChargeUnit Start−Up System RefrigerantCooling Mode Indoor Airflow Check Heating Mode Indoor Airflow CheckAdding or Removing Refrigerant Airflowindoor CoilUsing HFC−410A Weigh In Method Subcooling Charging MethodAir Handler / Coil Match ups and Targeted Subcooling Values Operating and Temperature Pressures PsigSystem Operations Defrost SystemResistor Location Sensor Temperature / Resistance Range Unit SensorsDefrost Calibration Sequence of Operations YESTest Pin E33 Functions S SLow Pressure S87 Switch Operation Or belowHigh Pressure Switch S4 Sequence of Operation Input Fault or Miswire Degrees Resistance Fahrenheit 136.3 2680 System Status, Fault and Lockout LED Codes DS11 and DS14 ATUS, Fault Lockout LED CodesResetting Fault and Lockout LED Codes DS15 and DS13 Ault Lockout LED CodesAlert Status Moderate Device225ºF 107ºC Lockout Vice removed or Clears after Field Configuration and Testing TroubleshootingFAN Motor B4 Test Procedure FAN Motor Control A177 OPERATION,Fan Motor Control Error/Fault LED Codes Fan Motor Control Stage LED Indicator CodesFan Motor Control RPM, LED Code and DC Voltage Output Fan Motor Control Flash and Pause DurationsTOP Grille or FAN Motor Mount Adjustment for FAN Clearance TOP Grille AdjustmentFAN Motor Position Adjustment Demand BeginsFAN Motor Control A177 PULSE−WIDTH Modulation PWM Testing for External Power to Fan Motor Control Strip StartTerminal FinishMaintenance Snow Guard Top CoverHomeowner SunSource Home Energy System XP17 Start−Up and Performance Checklist Cooling ModeHeating Mode START−UP Checks