Lenox 50677201 Line Set Requirements, Adding Polyol Ester OIL Requirements, Refrigerant Line Set

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Line Set Requirements

This section provides information on: installation of new or replacement line set.

SAdding Polyol ester oil requirements

SNew or replacement line set installation

SUsing existing line set.

ADDING POLYOL ESTER OIL REQUIREMENTS

IMPORTANT

Mineral oils are not compatible with HFC−410A. If oil must be added, it must be a Polyol Ester oil.

The compressor is charged with sufficient Polyol Ester oil (POE) for line set lengths up to 50 feet. Recommend adding oil to system based on the amount of refrigerant charge in the system. Systems with 20 pounds or less of refrigerant required no oil to be added.

For systems over 20 pounds − add one ounce for every five

(5) pounds of HFC−410A refrigerant.

Recommended topping−off POE oils are Mobil EAL ARCTIC 22 CC or ICI EMKARATEt RL32CF.

NEW OR REPLACEMENT LINE SET INSTALLATION

Field refrigerant piping consists of both liquid and vapor lines from the outdoor unit to the indoor coil. Use Lennox L15 (sweat, non−flare) series line set, or field−fabricated refrigerant line sizes as specified in table 2.

If refrigerant lines are routed through a wall, then seal and isolate the opening so vibration is not transmitted to the building. Pay close attention to line set isolation during installation of any HVAC system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant lines will not create unnecessary vibration and subsequent sounds. See figure 8 for recommended installation practices.

NOTE When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351−L9, or contact Lennox Technical Support Product Applications for assistance. To obtain the correct information from Lennox, be sure to communicate the following information:

SModel (XP14) and size of unit (e.g. −036).

SLine set diameters for the unit being installed as listed in table 2 and total length of installation.

SNumber of elbows vertical rise or drop in the piping.

USING EXISTING LINE SET

Things to consider:

SLiquid line that meter the refrigerant, such as RFC1 liquid line, must not be used in this application.

SExisting line set of proper size as listed in table 2 may be reused.

SIf system was previously charged with HCFC−22 refrigerant, then existing line set must be flushed (see Flushing Line Set and Indoor Coil on page 15).

If existing line set is being used, then proceed to Brazing Connections on page 11.

IMPORTANT

Lennox highly recommends changing line set when converting the existing system from HCFC−22 to HFC−410A. If that is not possible and the line set is the proper size as reference in table 2, use the procedure outlined under Flushing Line Set and Indoor Coil on page 13.

IMPORTANT

If this unit is being matched with an approved line set or indoor unit coil which was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device, and reduce the system performance and capacity.

Failure to properly flush the system per the instructions below will void the warranty.

Table 2. Refrigerant Line Set

Model

Valve Field Connections

Recommended Line Set

 

 

 

 

 

 

 

Liquid Line

Vapor Line

Liquid Line

Vapor Line

L15 Line Sets

 

 

 

 

 

 

XP14−018−230

 

 

 

 

 

 

 

 

 

 

 

XP14−024−230

3/8 in. (10 mm)

3/4 in. (19 mm)

3/8 in. (10 mm)

3/4 in. (19 mm)

L15−41

 

 

 

 

 

 

XP14−030−230

 

 

 

 

 

 

 

 

 

 

 

XP14−036−230

 

 

 

 

 

 

 

 

 

 

 

XP14−042−230

3/8 in. (10 mm)

7/8 in. (22 mm)

3/8 in. (10 mm)

7/8 in. (22 mm)

L15−65

 

 

 

 

 

 

XP14−048−230

 

 

 

 

 

 

 

 

 

 

 

XP14−060−230

3/8 in. (10 mm)

1−1/8 in. (29 mm)

3/8 in. (10 mm)

1−1/8 in. (29 mm)

Field Fabricated

 

 

 

 

 

 

NOTE

 

 

 

 

 

 

 

 

 

 

 

506728−01

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Contents Shipping and Packing List Table of ContentsGeneral Side View Unit Dimensions Inches mmModel Number Identification 14 −036 − 230 − TOP ViewTypical Unit Parts Arrangement PLUMBING, Switches Sensor ComponentsControl Panel Operating Gauge Set and Service Valves Caps and Fasteners Torque Requirements11 12 3RECOVERING Refrigerant Recovering Refrigerant from Existing System1DISCONNECT Power Method Method 2 LimitationsNew Outdoor Unit Placement Elevated Slab Mounting Detail a Outside Unit PlacementUsing Feet Extenders Detail D Slab Side MountingLouvered Panel Installation Removing and Installing PanelsLouvered 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 Sensing Bulb Installation Installing New Indoor Metering DeviceIndoor Expansion Valve Installation Equalizer Line InstallationManifold Gauge Set Connections for Leak Testing Leak Test Line Set and Indoor CoilEvacuating Line Set and Indoor Coil Evacuating Line Set and Indoor CoilElectrical Size Circuit and Install Disconnect2INSTALL Thermostat 24VAC TransformerTypical Unit Wiring Diagram Typical Factory Wiring Copeland Compressor Typical Factory Wiring Interlink Compressor Leak CHECK, Repair and Evacuate Unit Start−UpUnit START−UP Connect Manifold Gauge SET and WEIGH−IN ChargeCalculating System Charge for Outdoor Unit Void of Charge Connections for Optimizing System ChargeRefrigerant Charge per Line Set Length Temperature rise F Adjusting Indoor AirflowOptimizing Procedure Optimizing System Refrigerant ChargeSATº LIQº SCº = Normal Operating Pressures − Liquid +10 and Vapor +5 Psig CBX32MV−018/024 CX34−31 Defrost System Defrost Control CMC1Dealer MaintenanceDefrost Control CMC1 Diagnostic LED HomeownerXP14 Series Job Name Job no Date Job Location City Start−Up and Performance ChecklistInstaller City Sequence of Operation Thermostat