Lennox International Inc 06/11 50672801 Recovering Refrigerant from Existing System, Method

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Recovering Refrigerant from Existing System

1DISCONNECT POWER

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

MAIN FUSE

BOX/BREAKER

PANEL

DISCONNECT

SWITCH

2CONNECT MANIFOLD GAUGE SET Connect a manifold gauge set, clean recovery cylinder and a recovery machine to the service ports of the existing unit..

NOTE recovery machine instructions to make the correct manifold gauge set connections for recovery refrigerant. The illustration below is a typical connection.

MANIFOLD GAUGES

RECOVERY MACHINE

LOW HIGH

3RECOVERING REFRIGERANT

CLEAN RECOVERY

OUTDOOR UNIT

CYLINDER

 

Remove existing HCFC−22 refrigerant using one of the following procedures:

METHOD 1:

METHOD 2 LIMITATIONS

Use Method 1 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.

Recover all HCFC−22 refrigerant from the existing system using a recovery machine and clean recovery cylinder. Check gauges after shutdown to confirm that the entire system is completely void of refrigerant.

METHOD 2:

Use Method 2 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.

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. Turn the outdoor unit main power OFF and use a recovery machine to remove the remaining refrigerant from the system.

NOTE

ensure complete refrigerant evacuation.

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.

NOTEMethod 2, the listed devices below could prevent full system charge recovery into the outdoor unit:

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

SCompressor 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 any of the above mentioned 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.

Figure 3. Refrigerant Recovery

IMPORTANT

The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

Failure to follow this warning may result in personal injury or death.

506728−01

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Contents Table of Contents Shipping and Packing ListGeneral Side View Unit Dimensions − Inches mmModel Number Identification 13 −036 − 230 −08 TOP ViewPLUMBING, Switches Sensor Components Typical Unit Parts ArrangementControl Panel Using Manifold Gauge SET Operating Gauge Set and Service ValvesOperating Service Valves Caps and Fasteners Torque RequirementsOperating Angle−Type Service Valve Operating Ball−Type Service ValveReinstall Stem Cap 3RECOVERING Refrigerant Recovering Refrigerant from Existing System1DISCONNECT Power Method Method 2 LimitationsNew Outdoor Unit Placement Detail a Outside Unit Placement Placement, Slab Mounting and Stabilizing UnitRemoving and Installing Panels Louvered Panel InstallationLouvered Panel Removal Line Set Requirements NEW or Replacement Line SET InstallationUsing Existing Line SET Adding Polyol Ester OIL RequirementsRefrigerant Line SET From Vertical to Horizontal Refrigerant Line SET Alling Horizontal RunsBrazing Connections 1CUT and Debur 2CAP and Core Removal6BRAZE Line SET Wrap Service ValvesFlow Nitrogen Preparation for Next Step2CONNECT Gauges and Equipment for Flushing Procedure 3FLUSHING Line SETSensing Bulb Installation Installing New Indoor Metering DeviceIndoor Expansion Valve Installation Equalizer Line InstallationLeak Test Line Set and Indoor Coil Connect Gauge SETTest for Leaks Evacuating Line Set and Indoor Coil 2EVACUATE the SystemElectrical Size Circuit and Install Disconnect2INSTALL Thermostat 24VAC TransformerTypical Unit Wiring Diagram Unit Start−Up Unit START−UPLeak CHECK, Repair and Evacuate Connect Manifold Gauge SET and WEIGH−IN ChargeConnections for Optimizing System Charge Using HFC−410A Weigh In Method Calculating System Charge for Outdoor Unit Void of ChargeOptimizing System Refrigerant Charge Optimizing ProcedureAdjusting Indoor Airflow CFM =If subcooling value is SATº LIQºSCº RefrigerantNormal Operating Pressures − Liquid +10 and Vapor +5 Psig HFC−410A Temperature F − Pressure Psig System Operation Defrost SystemDefrost Control CMC1 OFF Indoor Unit MaintenanceDealer Indoor CoilXP13 Series Job Name Job no Date Job Location City Start−Up and Performance ChecklistInstaller City Sequence of Operation Thermostat

LENNOX Elite Series XP13 Units HEAT PUMPS, 06/11 50672801 specifications

Lennox International Inc., a leading name in the HVAC (heating, ventilation, and air conditioning) industry, has a reputation for delivering high-quality and energy-efficient systems. One of the standout products in their lineup is the Lennox Elite Series XP13 heat pump, model number 50672801. This heat pump is designed to provide exceptional comfort throughout the year while offering efficiency and reliability that homeowners can depend on.

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