Lenox Elite Series XP14 Units HEAT PUMPS Optimizing System Refrigerant Charge, Amps x Volts x

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OUTDOOR UNIT

DISTRIBUTOR

 

 

NOTE − ARROWS INDICATE DIRECTION

 

 

 

 

OF REFRIGERANT FLOW

 

REVERSING VALVE

CHECK / EXPANSION

 

 

VALVE

 

 

 

OUTDOOR

 

 

COIL

 

BI−FLOW FILTER / DRIER

 

INDOOR UNIT

 

 

 

MUFFLER

 

 

TRUE SUCTION

VAPOR

 

PORT

 

SERVICE

 

 

 

 

PORT

LIQUID LINE

COMPRESSOR

 

SERVICE PORT

 

 

 

 

 

CHECK / EXPANSION VALVE

INDOOR

NOTE − Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines andCOIL indoor coil. Use true suction port to measure vapor pressure during charging.

Figure 21. Heat Pump Cooling Cycle

Optimizing System Refrigerant Charge

This section provides instructions on optimizing the system charge. This section includes:

SOptimizing procedure

SAdjusting indoor airflow

SUsing subcooling method

SApproved matched components, targeted subcooling (SC) values and add charge values

efficiency. Make any air flow adjustments before continuing with the optimizing procedure.

5.Use subcooling method to optimize the system charge (see figure 23). Adjust charge as necessary.

ADJUSTING INDOOR AIRFLOW

Heating Mode Indoor Airflow Check

(Only use when indoor unit has electric heat)

SNormal operating pressures

STemperature pressures

OPTIMIZING PROCEDURE

1.Move the low−side manifold gauge hose from the vapor line service valve to the true suction port (see figure 19).

2.Set the thermostat for either cooling or heating demand. Turn on power to the indoor unit and close the outdoor unit disconnect switch to start the unit.

3.Allow unit to run for five minutes to allow pressures to stabilize.

4.Check the airflow as instructed under Adjusting Indoor Airflow to verify or adjust indoor airflow for maximum

Indoor blower airflow (CFM) may be calculated by energizing electric heat and measuring:

STemperature rise between the return air and supply air temperatures at the indoor coil blower unit,

SMeasuring voltage supplied to the unit,

SMeasuring amperage being drawn by the heat unit(s).

Then, apply the measurements taken in the following formula to determine CFM:

Amps x Volts x 3.41

CFM =

1.08 x Temperature rise (F)

Cooling Mode Indoor Airflow Check

Check airflow using the Delta−T (DT) process using figure 22.

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XP14 SERIES

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Contents Shipping and Packing List Table of ContentsGeneral Model Number Identification 14 −036 − 230 − Unit Dimensions Inches mmSide View TOP ViewTypical Unit Parts Arrangement PLUMBING, Switches Sensor ComponentsControl Panel Caps and Fasteners Torque Requirements Operating Gauge Set and Service Valves11 12 1DISCONNECT Power Recovering Refrigerant from Existing System3RECOVERING Refrigerant Method Method 2 LimitationsNew Outdoor Unit Placement Using Feet Extenders Detail a Outside Unit PlacementElevated Slab Mounting Detail D Slab Side MountingLouvered Panel Installation Removing and Installing PanelsLouvered Panel Removal Using Existing Line SET NEW or Replacement Line SET InstallationLine Set Requirements Adding Polyol Ester OIL RequirementsRefrigerant Line SET Alling Horizontal Runs Refrigerant Line SET From Vertical to HorizontalBrazing Connections 2CAP and Core Removal 1CUT and DeburFlow Nitrogen Wrap Service Valves6BRAZE Line SET Preparation for Next Step2CONNECT Gauges and Equipment for Flushing Procedure Indoor Expansion Valve Installation Installing New Indoor Metering DeviceSensing Bulb Installation Equalizer Line InstallationLeak Test Line Set and Indoor Coil Manifold Gauge Set Connections for Leak TestingEvacuating Line Set and Indoor Coil Evacuating Line Set and Indoor Coil2INSTALL Thermostat Size Circuit and Install DisconnectElectrical 24VAC TransformerTypical Unit Wiring Diagram Typical Factory Wiring Copeland Compressor Typical Factory Wiring Interlink Compressor Unit START−UP Unit Start−UpLeak CHECK, Repair and Evacuate 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 Optimizing Procedure Adjusting Indoor AirflowTemperature rise F Optimizing System Refrigerant ChargeSATº LIQº SCº = Normal Operating Pressures − Liquid +10 and Vapor +5 Psig CBX32MV−018/024 CX34−31 Defrost Control CMC1 Defrost SystemDefrost Control CMC1 Diagnostic LED MaintenanceDealer HomeownerXP14 Series Installer City Start−Up and Performance ChecklistJob Name Job no Date Job Location City Sequence of Operation Thermostat
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