Lennox International Inc CONDENSING UNITS Flushing Line Set and Indoor Coil

Page 14

Flushing Line Set and Indoor Coil

Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering Device on page 15.

TYPICAL EXISTING FIXED ORIFICE

TYPICAL EXISTING EXPANSION VALVE REMOVAL

REMOVAL PROCEDURE (UNCASED

OR 1BPROCEDURE (UNCASED COIL SHOWN)

1A COIL SHOWN)

 

 

STUB END

 

DISTRIBUTOR TUBES

TWO PIECE PATCH PLATE

LIQUID LINE

CHECK

(UNCASED COIL ONLY)

 

ORIFICE

EXPANSION

LIQUID LINE ORIFICE HOUSING

 

DISTRIBUTOR

HOUSING

VALVE

 

 

 

TEFLON® RING

TUBES

 

TEFLON®

 

 

RING

FIXED ORIFICE

 

 

 

BRASS NUT

DISTRIBUTOR ASSEMBLY

REMOVE AND DISCARD

WHITE TEFLON® SEAL

(IF PRESENT) LIQUID LINE ASSEMBLY (INCLUDES STRAINER)

AOn fully cased coils, remove the coil access and plumbing panels.

BRemove any shipping clamps holding the liquid line and distributor as- sembly.

CUsing two wrenches, disconnect liquid line from liquid line orifice hous- ing. Take care not to twist or damage distributor tubes during this pro- cess.

TEFLON®

RINGSENSING

LINE

DISTRIBUTOR EQUALIZER

ASSEMBLY LINE

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

MALE EQUALIZER

 

 

LINE FITTING

VAPOR

 

 

LIQUID

SENSING BULB

LINE

LINE

 

 

 

DRemove and discard fixed orifice, valve stem assembly if present and Teflon® washer as illustrated above.

EUse a field−provided fitting to temporary reconnect the liquid line to the indoor unit’s liquid line orifice housing.

AOn fully cased coils, remove the coil access and plumbing panels.

BRemove any shipping clamps holding the liquid line and distributor assembly.

CDisconnect the equalizer line from the check expansion valve equalizer line fitting on the vapor line.

2CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE

DRemove the vapor line sensing bulb.

EDisconnect the liquid line from the check expansion valve at the liquid line assembly.

 

 

 

 

 

 

 

 

 

INVERTED HCFC−22

 

 

 

 

 

 

GAUGE

 

F Disconnect the check expansion valve from the liquid line orifice

 

 

 

 

 

 

 

 

 

CYLINDER CONTAINS

 

 

 

 

MANIFOLD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

housing. Take care not to twist or damage distributor tubes during this

 

 

 

 

 

 

 

 

 

CLEAN HCFC−22 TO BE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

process.

 

 

 

 

 

 

 

A

USED FOR FLUSHING.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G Remove and discard check expansion valve and the two Teflon® rings.

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW

 

 

 

 

 

 

 

 

 

 

 

 

 

HIGH

 

H Use a field−provided fitting to temporary reconnect the liquid line to the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VAPOR LINE

 

 

 

 

 

 

NEW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

indoor unit’s liquid line orifice housing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SERVICE VALVE

 

 

 

 

 

 

OUTDOOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FLUSHING LINE SET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPENED

 

 

 

 

 

 

 

CLOSED

 

The line set and indoor unit coil must be flushed with at least the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXISTING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3same amount of clean refrigerant that previously charged the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDOOR

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

system. Check the charge in the flushing cylinder before

 

UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

proceeding.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LIQUID LINE SERVICE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A Set the recovery machine for liquid recovery and start the

 

 

VALVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

recovery machine. Open the gauge set valves to allow the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

recovery machine to pull a vacuum on the existing system line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TANK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

set and indoor unit coil.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RETURN

 

 

 

 

 

 

 

 

 

 

 

 

 

VAPOR LIQUID

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

B Invert the cylinder of clean HCFC−22 and open its valve to allow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

INLET

 

 

 

 

 

 

 

 

 

 

liquid refrigerant to flow into the system through the vapor line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RECOVERY

 

 

 

 

 

 

 

 

 

 

 

DISCHARGE

 

 

 

 

 

 

 

 

 

 

valve. Allow the refrigerant to pass from the cylinder and through

CYLINDER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RECOVERY MACHINE

 

 

the line set and the indoor unit coil before it enters the recovery

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

machine.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A Inverted HCFC−22 cylinder with clean refrigerant to the vapor service

C After all of the liquid refrigerant has been recovered, switch the

 

recovery machine to vapor recovery so that all of the HCFC−22

 

valve.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

vapor is recovered. Allow the recovery machine to pull down to 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B HCFC−22 gauge set (low side) to the liquid line valve.

 

 

the system.

C HCFC−22 gauge set center port to inlet on the recovery machine with an

D Close the valve on the inverted HCFC−22 drum and the gauge

 

empty recovery tank to the gauge set.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

set valves. Pump the remaining refrigerant out of the recovery

D Connect recovery tank to recovery machines per machine instructions.

 

machine and turn the machine off.

Figure 11. Removing Metering Device and Flushing

Page 14

506645−01

Page 13 Page 15
Image 14
Page 13 Page 15
Contents General Table of ContentsShipping and Packing List Condensing UnitsUnit Dimensions − Inches mm Side ViewTypical Unit Parts Arrangement Model Number Identification AC X −024 − 230 −13Operating Service Valves Operating Manifold Gauge Set and Service ValvesUsing Manifold Gauge SET Torque Requirements11 12 98 7 6 Recovering Refrigerant Recovering Refrigerant from Existing System1DISCONNECT Power 2CONNECT Manifold Gauge SETMinimum Clearance Between TWO Units New Unit PlacementClearance on ALL Sides Minimum Clearance Above Unit Positioning ConsiderationsRoof Mounting Removing and Installing LouversPlacing Unit on Slab StepNew or Replacement Line Set Mineral oils are not compatible with HFC−410A. If oilVertical Runs NEW Construction Shown InstallationRefrigerant Line SET Alling Refrigerant Line SET From Vertical to HorizontalBrazing Connections Brazing Procedures 1CUT and Debur6BRAZE Line SET Wrap Service ValvesFlow Nitrogen 7PREPARATION for Next Step2CONNECT Gauges and Equipment for Flushing Procedure Flushing Line Set and Indoor CoilSensing Bulb Installation Installing Indoor Metering DeviceIndoor Expansion Valve Installation Equalizer Line InstallationLeak Test Line Set and Indoor Coil Leak detector must be capable of sensing HFC refrigerantEvacuating Line Set and Indoor Coil Connect Gauge SETElectrical 24VAC TransformerSingle Phase High Voltage / Ground Wires LOW Voltage Control WiringTypical Factory Wiring Diagram Copeland Compressor Typical Factory Wiring Diagram Interlink Compressor Unit Start−Up Connections for Testing and ChargingServicing Units Delivered Void of Charge System RefrigerantChecking AIR Flow AT Indoor Coil Start Determine how refrigerant is meteredCalculating System Charge for Outdoor Unit Void of Charge BelowHFC−410A Subcooling TXV Charge Start Measure outdoor ambient temperature Superheat RFCProblem exists with some component in the system Unit Components MaintenanceSystem Operation Homeowner Start−Up and Performance Checklist
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