Lennox International Inc 506586-01 Recovering Refrigerant from Existing System, 1DISCONNECT Power

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Recovering Refrigerant from Existing System

1DISCONNECT POWER

Disconnect all power to the existing outdoor unit at the disconnect switch or main fuse box/breaker panel.

SERVICE DISCONNECT

SWITCH

2CONNECT MANIFOLD GAUGE SET

Connect a gauge set, clean recovery cylinder and a recovery machine to the service ports of the existing unit. Use the instruction provided with the recovery machine to make the connections.

MANIFOLD GAUGES

RECOVERY MACHINE

LOW

HIGH

RECOVERING REFRIGERANT

Remove existing HCFC−22 refrigerant using one of the following methods

CLEAN RECOVERY

OUTDOOR UNIT

3below:

CYLINDER

 

IMPORTANT

 

r

long line sets.

 

 

 

 

 

METHOD 1:

Us this method if the existing outdoor unit is not equipped with shut−off valves, or if the unit is not operational and you plan to use the existing HCFC−22 to flush the system.

Remove all HCFC−22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of refrigerant.

METHOD 2:

Use this method if the existing outdoor unit is equipped with manual shut−off valves, and you plan to use new HCFC−22 refrigerant to flush the system.

The following devices could prevent full system charge recovery into the outdoor unit:

S

S

Outdoor unit’s high or low−pressure switches (if applicable) when tripped can cycle the compressor OFF.

Compressor can stop pumping due to tripped internal pressure relief valve.

SCompressor has internal vacuum protection that is designed to unload the scrolls (compressor stops pumping) when the pressure ratio meets a certain value or when the suction pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into a vacuum. Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and internal seals.)

Once the compressor can not pump down to a lower pressure due to one of the above system conditions, shut off the vapor valve. Turn OFF the main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set.

Perform the following task:

AStart the existing HCFC−22 system in the cooling mode and close the liquid line valve.

BUse the compressor to pump as much of the existing HCFC−22 refrigerant into the outdoor unit until the outdoor system is full (high pressure switch will trip and shut the compressor off). Turn the outdoor unit main power OFF and use a recovery machine to remove the remaining refriger- ant from the system.

NOTE

CWhen the low side system pressures reach 0 psig, close the vapor line valve.

DCheck gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.

Figure 3. Refrigerant Recovery Procedure

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506586−01 10/10

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Contents Table of Contents GeneralHeat Pumps Model Number Identification Unit Dimensions −− Inches mmSide View Access View Base with Elongated LegsTypical Unit Parts Arrangement Control BOXUsing Manifold Gauge Set Operating Service ValvesShipping and Packing List To Access Service Port Operating Angle Type Service ValveOperating Ball Type Service Valve Reinstall Stem CapRecovering Refrigerant Recovering Refrigerant from Existing System1DISCONNECT Power 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 Detail C Louvered Panel InstallationLouvered Panel Removal 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 RemovalBraze Line SET Wrap Service ValvesFlow Nitrogen 7PREPARATION for Next StepFlushing Line Set and Indoor Coil Flushing Line Set and Indoor CoilSensing Bulb Installation Installing Indoor Expansion ValveIndoor Expansion Valve Installation Equalizer Line InstallationLeak Test Line Set and Indoor Coil Leak TestEvacuating Line Set and Indoor Coil S S S SElectrical Size Circuit and Install Disconnect2INSTALL Thermostat 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 Unit Start−Up Connections for Testing and ChargingServicing Units Delivered Void of Charge System RefrigerantAdding or Removing Refrigerant Cooling Mode Indoor Airflow CheckHeating Mode Indoor Airflow Check 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 Resetting Fault and Lockout LED Codes System Status, Fault and Lockout LED CodesDS11 and DS14 ATUS, Fault Lockout LED Codes DS15 and DS13 Ault Lockout LED CodesAlert Status Moderate Device225ºF 107ºC Lockout Vice removed or Clears after FAN Motor B4 Test Procedure Field Configuration and TestingTroubleshooting FAN Motor Control A177 OPERATION,Fan Motor Control RPM, LED Code and DC Voltage Output Fan Motor Control Error/Fault LED CodesFan Motor Control Stage LED Indicator Codes Fan Motor Control Flash and Pause DurationsFAN Motor Position Adjustment TOP Grille or FAN Motor Mount Adjustment for FAN ClearanceTOP Grille Adjustment Demand BeginsFAN Motor Control A177 PULSE−WIDTH Modulation PWM Testing for External Power to Fan Motor Control Terminal StripStart FinishMaintenance Snow Guard Top CoverHomeowner SunSource Home Energy System Heating Mode XP17 Start−Up and Performance ChecklistCooling Mode START−UP Checks