User's Manual

ManualsBrandsLennox International Inc. ManualsAir ConditionersLennox International Inc. Lennox International Inc. Air Conditioner Dave Lennox Signature Collection XC21 System

Page 1

7/2012 506923−01

*2P72012* *P506923-01*

E2012 Lennox Industries Inc.

Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

WARNING

The State of California has determined that this product

may contain or produce a chemical or chemicals, in very

low doses, which may cause serious illness or death. It

may also cause cancer, birth defects, or reproductive

harm.

General

This XC21 outdoor unit is designed for use with HFC−410A

refrigerant only. This unit must be installed with an ap-

proved indoor unit. See the Lennox XC21 Product Specifi-

cations bulletin (EHB) for approved indoor component

match ups.

These instructions are intended as a general guide and do

not supersede local codes in any way. Consult authorities

having jurisdiction before installation.

INSTALLATION

INSTRUCTIONS

Dave Lennox Signature

Collection XC21 System

AIR CONDITIONERS

506923−01

7/2012

Supersedes 4/2012

WARNING

Improper installation, adjustment, alteration, service or

maintenance can cause property damage, personal inju-

ry or loss of life.

Installation and service must be performed by a licensed

professional installer (or equivalent) or service agency.

CAUTION

Before attempting to perform any service or mainte-

nance, turn the electrical power to unit OFF at discon-

nect switch.

NOTICE !

For more in−depth information, consult the Installa-

tion and Service Procedures manual, available as

Corp.1007−L2 on DaveNet or through the Technical

Support department at 800−453−6669.

STEP 1 −− SETTING THE UNIT −− Clearances

CONTROL

PANEL ACCESS

LOCATION

6 (152)

36 (914)

12 (305)

30 (762)

(610)

LINE SET

CONNECTIONS

ACCESS PANEL

REAR VIEW OF UNIT

48 (1219)

MINIMUM CLEARANCE BETWEEN TWO UNITS

CLEARANCE ON ALL SIDES  INCHES (MILLIMETERS)

MINIMUM CLEARANCE

ABOVE UNIT

NOTES:

S Clearance to access panel must be 30

inches (762mm).

S Clearance to one of the other three

sides must be 36 inches (914mm).

S Clearance to one of the remaining two

sides may be 12 inches (305mm) and

the final side may be 6 inches

(152mm).

FIGURE 1

Litho U.S.A.

Summary of content (19 pages)

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INSTALLATION INSTRUCTIONS E2012 Lennox Industries Inc. Dallas, Texas, USA Dave Lennox Signature® Collection XC21 System AIR CONDITIONERS 506923−01 7/2012 Supersedes 4/2012 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE Litho U.S.A. WARNING WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life.
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UNIT DIMENSIONS − INCHES (MM) 39−1/2 (1003) DISCHARGE AIR 35−1/2 (902) ELECTRICAL INLETS 47 (1194) SUCTIOn LINE INLET 4−1/2 (114) LIQUID LINE INLET 18−1/2 (470) 8 (203) 1 (25) SIDE VIEW ACCESS VIEW UNIT SUPPORT FEET 26−7/8 (683) 16−7/8 (429) 8−3/4 (222) 3−3/4 (95) 30−3/4 (781) 3−1/8 (79) 4−5/8 (117) BASE WITH ELONGATED LEGS NOTICE ! STEP 1 −− SETTING THE UNIT (Continued) −− Unit Placement Roof Damage! This system contains both refrigerant and oil.
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STABILIZING UNIT ON UNEVEN SURFACES PLACEMENT #10 X 1/2" LONG SELF−DRILLING SHEET METAL SCREWS INSTALL UNIT AWAY FROM WINDOWS COIL STABILIZING BRACKET (18 GAUGE METAL 2" WIDTH; HEIGHT AS REQUIRED) BASE PAN #10 X 1−1/4" LONG HEX HD SCREW AND FLAT WASHER CORNER POST Concrete slab use two plastic anchors (hole drill 1/4") TWO 90_ ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION ! FIGURE 2 Unit Stabilizer Bracket Use (field−provided): Always use stabilizers when unit is raised above th
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IMPORTANT ! WARNING If this unit is being matched with an approved line set or indoor unit coil that 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.
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STEP 2 −− REFRIGERANT PIPING −− Removing Existing Indoor Metering Device 1A TYPICAL EXISTING FIXED ORIFICE REMOVAL PROCEDURE (UNCASED COIL SHOWN) 1B TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE (UNCASED COIL SHOWN) OR TWO−PIECE PATCH PLATE (UNCASED COIL ONLY) DISTRIBUTOR TUBES LIQUID LINE ORIFICE HOUSING DISTRIBUTOR TUBES STUB END LIQUID LINE ORIFICE EXPANSION VALVE HOUSING TEFLON® RING TEFLON® RING FIXED ORIFICE BRASS NUT TEFLON® RING DISTRIBUTOR ASSEMBLY REMOVE AND DISCARD WHITE TEFLON®
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STEP 2 −− REFRIGERANT PIPING −− Brazing Procedures 1 PIPING PANEL REMOVAL / PREPARING LINE SET Remove piping panel to access service valves. Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain round. Do not crimp end of the line. 2 CAP AND CORE REMOVAL Remove service cap and core from both the suction / vapor and liquid line service ports.
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CAUTION WARNING Brazing alloys and flux contain materials which are hazardous to your health. Avoid breathing vapors or fumes from brazing operations. Perform operations only in well−ventilated areas. Wear gloves and protective goggles or face shield to protect against burns. Wash hands with soap and water after handling brazing alloys and flux. 4 5 6 Danger of fire. Bleeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing.
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STEP 3 −− INSTALLING INDOOR EXPANSION VALVE This outdoor unit is designed for use in systems that include an expansion valve metering device. See the XC21 Product Specifications bulletin (EHB) for approved expansion valve kit match−ups and application information. The expansion valve can be installed internal or external to the indoor coil.
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STEP 4 −− LEAK TEST AND EVACUATION LOW HIGH MANIFOLD GAUGE SET OUTDOOR UNIT A B TO VAPOR SERVICE VALVE NOTE − Position canister to deliver liquid refrigerant. NITROGEN 1 HFC−410A CONNECT GAUGE SET A. Connect the high pressure hose of an HFC−410A manifold gauge set to the vapor valve service port. NOTE Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. B.
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STEP 4 −− LEAK TEST AND EVACUATION (Continued) 3 EVACUATION A. B. C. D. HIGH LOW CONNECT GAUGE SET NOTE Remove cores from service valves (if not already done). Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve Connect high side of manifold gauge set to liquid line service valve Connect available micron gauge connector on the 1/4 SAE in−line tee. Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set.
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STEP 5 −− ELECTRICAL −− Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC). Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.
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3 A. ROUTE CONTROL WIRES NON−COMMUNICATING Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit. All low voltage wiring must enter unit through provided field−installed busing installed in electrical inlet. Run 24VAC control wires through hole with grommet. Make 24VAC control wire connections to outdoor control (A175). CONTROL (A175) NOTE Do not bundle any excess 24VAC control wires inside control box.
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STEP 5 −− ELECTRICAL (Continued) −− Outdoor Control (A175) Jumpers and Terminals Communication System The Lennox icomfortt−enabled thermostat must be used in communicating applications. The jumper settings and link are default settings and ONLY control system operation if configuration settings in the icomfortt−enabled thermostat are not available. Non−Communicating System The unit will operate based on jumper settings and R−TO− DS link on the MAIN CONTROL.
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STEP 5 −− ELECTRICAL (Continued) −− Field Control Wiring The following two illustrations provide examples of control wiring connections when using a non−communicating thermostat. For examples of control wiring in complete or partial communicating systems, see the icomfortt−enabled thermostat Quick Start Guide which is provided with the thermostat.
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Furnace ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 5 XC21 Two−Stage Air Conditioner Control DS R O W G L On−board link W2 Low voltage thermostat wiring L Y2 H W1 DH O Y1 O L R DS H C 2 C D Y1 B 3 4 Y2 Y2 G Y1 1 R C W2 T W1 1. 2. 3. 4. 5. T Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional).
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2. Adjust room thermostat set point 5ºF above (heating operation) or 5ºF below (cooling operation) the room temperature. Charging The XC21 unit is factory−charged with enough HFC−410A refrigerant to accommodate a 15−foot length of refrigerant piping. Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access panel. Detailed information is given in the XC21 Installation and Service Procedures manual, which is available on DaveNet. 3.
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XC21 Field Operational Checklist Cooling*** Unit Readings Y1 First Stage Heating*** Expected results during Y2 demand (toggle switch ON) Y2 Second Stage Y1 First Stage Expected results during Y2 demand (toggle switch ON) Y2 Second Stage Compressor Voltage Same Same Amperage Higher Higher Same or Higher Same or Higher Ambient Same Same Outdoor Coil Discharge Air Higher Lower Compressor Discharge Line Higher Higher Indoor Return Air Same Same Indoor Coil Discharge Air Lower Highe
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XC21 Start−Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Solar Module Mfg and Model Serial Notes: START−UP CHECKS Refrigerant Type: Rated Load Amps Actual Amps Condenser Fan Full Load Amps Actual Amps: Rated Volts Actual Volts COOLING MODE Vapor Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air Temperature: HEATING MODE Vapor Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Retu
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Routine Maintenance Homeowner Information In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. CAUTION Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch. Cleaning of the outdoor unit’s coil should be performed by a licensed professional service technician (or equivalent).