Page 17/2012 50692301

2012 Lennox Industries Inc.Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THEHOMEOWNER FOR FUTURE REFERENCE

WARNINGThe State of California has determined that this productmay contain or produce a chemical or chemicals, in verylow doses, which may cause serious illness or death. Itmay also cause cancer, birth defects, or reproductiveharm.

General

This XC21 outdoor unit is designed for use with HFC410Arefrigerant only. This unit must be installed with an ap-proved indoor unit. See the Lennox XC21 Product Specifi-cations bulletin (EHB) for approved indoor componentmatch ups.

These instructions are intended as a general guide and donot supersede local codes in any way. Consult authoritieshaving jurisdiction before installation.

INSTALLATIONINSTRUCTIONS

Dave Lennox Signature

Collection XC21 System

AIR CONDITIONERS506923017/2012Supersedes 4/2012

WARNINGImproper installation, adjustment, alteration, service ormaintenance can cause property damage, personal inju-ry or loss of life.

Installation and service must be performed by a licensedprofessional installer (or equivalent) or service agency.

CAUTIONBefore attempting to perform any service or mainte-nance, turn the electrical power to unit OFF at discon-nect switch.

NOTICE !

For more indepth information, consult the Installa-tion and Service Procedures manual, available asCorp.1007L2 on DaveNet or through the TechnicalSupport department at 8004536669.

STEP 1 SETTING THE UNIT Clearances

CONTROLPANEL ACCESS

LOCATION

6 (152)

36 (914)

12 (305)30 (762)

24(610)

LINE SETCONNECTIONS

ACCESS PANEL

REAR VIEW OF UNIT

48 (1219)

MINIMUM CLEARANCE BETWEEN TWO UNITS

CLEARANCE ON ALL SIDES INCHES (MILLIMETERS) MINIMUM CLEARANCEABOVE UNIT

NOTES: Clearance to access panel must be 30

inches (762mm).

Clearance to one of the other threesides must be 36 inches (914mm).

Clearance to one of the remaining twosides may be 12 inches (305mm) andthe final side may be 6 inches(152mm).

FIGURE 1

Litho U.S.A.

Page 2

UNIT DIMENSIONS INCHES (MM)

391/2

(1003)351/2

(902)

47

(1194)

181/2

(470)

8 (203)

1 (25)

41/2

(114)LIQUIDLINEINLET

ELECTRICALINLETS

SIDE VIEW ACCESS VIEW

DISCHARGEAIR

45/8(117)

BASE WITH ELONGATED LEGS

167/8(429)

83/4(222)

267/8(683)

33/4 (95)

303/4(781)

31/8(79)

SUCTIOnLINEINLET

UNIT SUPPORTFEET

STEP 1 SETTING THE UNIT (Continued) Unit Placement

WARNINGTo prevent personal injury, as well as damage to panels,unit or structure, observe the following:

While installing or servicing this unit, carefully stow allremoved panels so that the panels will not cause injuryto personnel, objects or nearby structures. Also, takecare to store panels where they will not be subject todamage (e.g., being bent or scratched).

While handling or stowing the panels, consider anyweather conditions (especially wind) that may causepanels to be blown around and damaged.

NOTICE !Roof Damage!

This system contains both refrigerant and oil. Somerubber roofing material may absorb oil, causing therubber to degrade. Failure to follow this noticecould result in damage to roof surface.

IMPORTANT !Exhaust vents from dryers, water heaters andfurnaces should be directed away from the outdoorunit. Prolonged exposure to exhaust gases and thechemicals contained within them may causecondensation to form on the steel cabinet and othermetal components of the outdoor unit. This willdiminish unit performance and longevity.

Page 3

XC21 SERIES

INSTALL UNIT AWAYFROM WINDOWS

TWO 90 ELBOWS INSTALLED IN LINE SETWILL REDUCE LINE SET VIBRATION

PLACEMENT

FIGURE 2

Install unit level or, if on a slope, maintain slope tolerance of 2degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away frombuilding structure.

GROUND LEVEL

MOUNTINGSLAB

BUILDINGSTRUCTURE DISCHARGE AIR

SLAB MOUNTING

FIGURE 3

LEG DETAIL

BASE

2" (50.8MM) SCH 40FEMALE THREADED

ADAPTER

ELEVATED SLAB MOUNTING USING FEET

EXTENDERS

2" (50.8MM)SCH 40 MALETHREADEDADAPTER

Use additional 2" SCH 40 malethreaded adapters which canbe threaded into the femalethreaded adapters to makeadditional adjustments to thelevel of the unit.

FIGURE 4

Unit Stabilizer Bracket Use(fieldprovided):

Always use stabilizers when unit is raisedabove the factory height. (Elevated units could become unstable ingusty wind conditions.)

Stabilizers may be used on any unit installedon unstable and uneven surfaces.

Concrete slab use twoplastic anchors (hole drill 1/4")

COIL

BASE PAN

CORNER POST

STABILIZING BRACKET(18 GAUGE METAL 2"

WIDTH; HEIGHT ASREQUIRED)

#10 X 1/2" LONGSELFDRILLING

SHEET METALSCREWS

#10 X 11/4" LONGHEX HD SCREW AND

FLAT WASHER

STABILIZING UNIT ON UNEVEN SURFACES

! IMPORTANT !

FIGURE 5

STEP 2 REFRIGERANT PIPING Flush-ing Existing Line Set & Indoor Coil

Flush the existing line set per the following instruc-tions. For more information, refer to the Installationand Service Procedures manual available on Dave-Net. CAUTION DO NOT attempt to flush and reuse ex-isting line sets or indoor coil when the system con-tains contaminants (i.e., compressor burn out).

NOTE When installing refrigerant lines longer than 50feet, refer to the Refrigerant Piping Design and FabricationGuidelines manual available on DaveNet (Corp. 9351L9),or contact the Technical Support Department Product Ap-plication group for assistance.

NOTE For new or replacement line set installation, referto Service and Application Note Corp. 9112L4 (C914).

TABLE 1REFRIGERANT LINE SET INCHES (MM)

Models Liquid

Line

Vapor/

Suction

Line

L15 Line Set

024, 036

and048

3/8 (10) 7/8 (22) L15 line set sizes are

dependent on unit match up.

See XP21 Engineering

Handbook to determine

correct line set sizes.

060 3/8 (10) 11/8 (29) Field Fabricated

NOTE Some applications may required a fieldprovided 7/8" to11/8" adapter.

Page 4

IMPORTANT !

If this unit is being matched with an approved lineset or indoor unit coil that was previously chargedwith mineral oil, or if it is being matched with a coilwhich was manufactured before January of 1999,the coil and line set must be flushed prior to installa-tion. Take care to empty all existing traps. Polyol es-ter (POE) oils are used in Lennox units charged withHFC410A refrigerant. Residual mineral oil can actas an insulator, preventing proper heat transfer. Itcan also clog the expansion device and reduce sys-tem performance and capacity.

Failure to properly flush the system per this instruc-tion and the detailed Installation and Service Proce-dures manual will void the warranty.

WARNINGWhen using a high pressure gas such asnitrogen to pressurize a refrigeration or airconditioning system, use a regulator thatcan control the pressure down to 1 or 2psig (6.9 to 13.8 kPa).

WARNINGRefrigerant can be harmful if it is inhaled. Refrigerantmust be used and recovered responsibly.

Failure to follow this warning may result in personal injuryor death.

WARNINGFire, Explosion and Personal Safety Haz-ard. Failure to follow this warning could re-sult in damage, personal injury or death.

Never use oxygen to pressurize or purgerefrigeration lines. Oxygen, when exposedto a spark or open flame, can cause fireand/or an explosion, that could result inproperty damage, personal injury or death.

WARNINGPolyol ester (POE) oils used with HFC410Arefrigerant absorb moisture very quickly. It is veryimportant that the refrigerant system be kept closedas much as possible. DO NOT remove line set capsor service valve stub caps until you are ready to makeconnections.

IMPORTANT !Some scroll compressors have an internal vacuumprotector that will unload scrolls when suction pres-sure goes below 20 psig. A hissing sound will beheard when the compressor is running unloaded.Protector will reset when low pressure in system israised above 40 psig. DO NOT REPLACE COM-PRESSOR.

CAUTIONAs with any mechanical equipment, contact with sharpsheet metal edges can result in personal injury. Takecare while handling this equipment.

Page 5

XC21 SERIES

STEP 2 REFRIGERANT PIPING Removing Existing Indoor Metering Device

SENSINGLINE

TEFLON RING

FIXED ORIFICE

BRASS NUT

LIQUID LINE ASSEMBLY(INCLUDES STRAINER)

LIQUID LINE ORIFICE HOUSING

DISTRIBUTOR TUBES

DISTRIBUTORASSEMBLY

REMOVE AND DISCARD

WHITE TEFLON SEAL(IF PRESENT)

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

2. Remove any shipping clamps from the liquid line and distributor as-sembly.

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

4. Remove and discard fixed orifice, valve stem assembly (if present)and Teflon washer as illustrated above.

5. Use a fieldprovided fitting to temporarily reconnect the liquid line to theindoor units liquid line orifice housing.

TYPICAL EXISTING FIXED ORIFICEREMOVAL PROCEDURE (UNCASED COIL SHOWN)

TYPICAL EXISTING EXPANSION VALVE REMOVALPROCEDURE (UNCASED COIL SHOWN)

TWOPIECE PATCH PLATE(UNCASED COIL ONLY)

VAPORLINE

DISTRIBUTORASSEMBLY

DISTRIBUTORTUBES

LIQUIDLINE

MALE EQUALIZERLINE FITTING

EQUALIZERLINE

EXPANSIONVA