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INSTALLATION
INSTRUCTIONS
2012 Lennox Industries Inc.
Dallas, Texas, USA
®
Dave Lennox Signature
Collection XC21 System
AIR CONDITIONERS
506923−01
7/2012
Litho U.S.A.
Supersedes 4/2012
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service or
WARNING
maintenance can cause property damage, personal inju-
The State of California has determined that this product ry or loss of life.
may contain or produce a chemical or chemica
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UNIT DIMENSIONS − INCHES (MM) DISCHARGE 39−1/2 35−1/2 ELECTRICAL AIR (1003) (902) 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 3−1/8 4−5/8 (781) (79) (117) BASE WITH ELONGATED LEGS NOTICE ! STEP 1 −− SETTING THE UNIT (Continued) −− Unit Placement Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, cau
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STABILIZING UNIT ON UNEVEN SURFACES PLACEMENT #10 X 1/2" LONG SELF−DRILLING INSTALL UNIT AWAY SHEET METAL FROM WINDOWS COIL SCREWS STABILIZING BRACKET (18 GAUGE METAL 2" BASE PAN WIDTH; HEIGHT AS REQUIRED) #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 ! IMPORTANT ! FIGURE 2 Unit Stabilizer Bracket Use (field−provided): Always use stabilizers when unit is ra
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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 Fire, Explosion and Personal Safety Haz- with mineral oil, or if it is being matched with a coil ard. Failure to follow this warning could re- which was manufactured before January of 1999, sult in damage, personal injury or death. the coil and line set must be flushed prior to installa- Never use oxygen to pressurize or purge tion. Take care to empty all existing traps. Po
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VAPOR LIQUID STEP 2 −− REFRIGERANT PIPING −− Removing Existing Indoor Metering Device TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE OR PROCEDURE (UNCASED COIL SHOWN) 1B 1A (UNCASED COIL SHOWN) STUB END TWO−PIECE PATCH PLATE LIQUID LINE DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE DISTRIBUTOR TUBES ® TEFLON ® TEFLON RING RING FIXED ORIFICE BRASS NUT ® TEFLON SENSING RING LINE DISTRIBUTOR ASSEMBLY DIS
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STEP 2 −− REFRIGERANT PIPING −− Brazing Procedures CAP AND CORE REMOVAL PIPING PANEL REMOVAL / PREPARING LINE SET Remove service cap and core from both the suction / Remove piping panel to access service valves. Cut 2 1 vapor and liquid line service ports. ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain SERVICE PORT CAP round. Do not crimp end of the line. SERVICE PORT CORE CUT AND DEBUR LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVI
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CAUTION WARNING Brazing alloys and flux contain materials which are Danger of fire. Bleeding the refrigerant hazardous to your health. charge from only the high side may result Avoid breathing vapors or fumes from brazing in pressurization of the low side shell and operations. Perform operations only in well−ventilated suction tubing. Application of a brazing areas. torch to a pressurized system may result Wear gloves and protective goggles or face shield to in ignition of the refrigerant and oi
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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. In applications where an uncased coil is being installed in a field−pro- vided plenum, install the expansion valve in a manner that will provide access for
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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 HFC−410A CONNECT GAUGE SET A. Connect the high pressure hose of an HFC−410A manifold gauge set to the vapor valve service port. 1 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. With both mani
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STEP 4 −− LEAK TEST AND EVACUATION (Continued) EVACUATION LOW HIGH CONNECT GAUGE SET NOTE Remove cores from service valves (if not already done). 3 A. Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve B. Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve 1/4 SAE TEE WITH SWIVEL UNIT GAUGE SET C. Connect available micron gauge connector COUPLER A on the 1/4 SAE in−line tee. D. Connect the vacuum pump (with vacuum 500 g
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STEP 5 −− ELECTRICAL −− Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes IMPORTANT ! and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current If unit is equipped with a crankcase heater, it should Canadian Electrical Code (CEC). be energized 24 hours before unit start−up to pre- vent compressor damage as a result of slugging. Refer to the furnace or air handler installation instructions for ad
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A. ROUTE CONTROL WIRES NON−COMMUNICATING 3 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. B NOTE Wire tie provides low voltage wire s
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STEP 5 −− ELECTRICAL (Continued) −− Outdoor Control (A175) Jumpers and Terminals Communication System The Lennox icomfort−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 icomfort−enabled thermostat are not available. NOTE Fan cycling routine when activated will cycle the Non −Communicating System fan ON for five minutes if the outdoor ambient air The unit will
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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 icomfort−enabled thermostat Quick Start Guide which is provided with the thermostat. Air Handler ComfortSense 7000 Thermostats Catalog # Y0349 or Y2081 7 DS XC21 Two −Stage Air Conditioner Control R O G W On −board link L W2 Low vol
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Furnace ComfortSense 7000 Thermostats 5 Catalog # Y0349 or Y2081 XC21 Two −Stage Air DS Conditioner Control R O G W On −board link L W2 Low voltage thermostat L wiring Y2 W1 H Y1 O DH O L R DS H C C 2 D Y1 B 3 Y2 Y2 4 1 Y1 G R C W2 T W1 T 1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional). ® 2. R to L connection is required for this model when using the ComfortSense 7000 − catalog number Y0349 only. Resistor Kit (catalog
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2. Adjust room thermostat set point 5ºF above (heating Charging operation) or 5ºF below (cooling operation) the room The XC21 unit is factory−charged with enough HFC−410A temperature. refrigerant to accommodate a 15−foot length of refrigerant 3. Remove control access panel. Install refrigeration piping. Charge should be checked and adjusted using the gauges on unit. Attach the amp meter to the common tables provided on the charging procedure sticker on the (black wire) wire of the compressor ha
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XC21 Field Operational Checklist Cooling*** Heating*** Unit Readings Y1 Expected results Y2 Expected results Y1 Y2 Second First during Y2 demand Second during Y2 demand First Stage Stage Stage (toggle switch ON) Stage (toggle switch ON) Compressor Voltage Same Same Amperage Higher Higher Condenser Fan motor Amperage Same or Higher Same or Higher Temperature Ambient Same Same Outdoor Coil Discharge Air Higher Lower Compressor Discharge Line Higher Higher Indoor Return Air Same Same Indoor Coil Di
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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 Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: 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: Return Air Tempe
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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 NOTE The filter and all access panels must be in place Before attempting to perform any service or mainte- any time the unit is in operation. If you are unsure about the nance, turn the electrical power to unit OFF at discon- filter required for your system, call your Len
