Lennox XC21 Installation Instructions Manual
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Also See for XC21:
- Unit information (58 pages) ,
- Installation instructions manual (52 pages) ,
- Engineering data (36 pages)
Table of Contents
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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.
STEP 1 −− SETTING THE UNIT −− Clearances
CLEARANCE ON ALL SIDES
6 (152)
12 (305)
36 (914)
MINIMUM CLEARANCE BETWEEN TWO UNITS
7/2012
*2P72012*
INCHES (MILLIMETERS)
NOTES:
S Clearance to access panel must be 30
CONTROL
inches (762mm).
PANEL ACCESS
S Clearance to one of the other three
LOCATION
30 (762)
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).
24
(610)
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection XC21 System
AIR CONDITIONERS
506923−01
7/2012
Supersedes 4/2012
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.
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at discon-
nect switch.
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.
ACCESS PANEL
LINE SET
CONNECTIONS
FIGURE 1
Page 1
WARNING
CAUTION
NOTICE !
MINIMUM CLEARANCE
ABOVE UNIT
48 (1219)
REAR VIEW OF UNIT
506923−01
*P506923-01*
®
Litho U.S.A.
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Table of Contents
Related Manuals for Lennox XC21
Summary of Contents for Lennox XC21
-
Page 1: Installation Instructions
Before attempting to perform any service or mainte- nance, turn the electrical power to unit OFF at discon- This XC21 outdoor unit is designed for use with HFC−410A nect switch. refrigerant only. This unit must be installed with an ap- proved indoor unit. - Page 2 UNIT DIMENSIONS − INCHES (MM) DISCHARGE 39−1/2 35−1/2 ELECTRICAL (1003) (902) INLETS (1194) SUCTIOn LINE INLET 4−1/2 (114) LIQUID LINE INLET 18−1/2 (470) 8 (203) SIDE VIEW 1 (25) 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...
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Page 3: Slab Mounting
See XP21 Engineering BASE Handbook to determine LEG DETAIL correct line set sizes. −060 3/8 (10) 1−1/8 (29) Field Fabricated NOTE Some applications may required a field−provided 7/8" to 1−1/8" adapter. FIGURE 4 Page 3 XC21 SERIES... - Page 4 Take care to empty all existing traps. Polyol es- refrigeration lines. Oxygen, when exposed ter (POE) oils are used in Lennox units charged with to a spark or open flame, can cause fire HFC−410A refrigerant. Residual mineral oil can act and/or an explosion, that could result in as an insulator, preventing proper heat transfer.
- Page 5 HCFC−22 gauge set center port to inlet on the recovery machine with an and turn the machine off. empty recovery tank connected to the gauge set. Connect recovery tank to recovery machine per machine instructions. FIGURE 6 Page 5 XC21 SERIES...
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Page 6: Cap And Core Removal
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 vapor and liquid line service ports. ends of the refrigerant lines square (free from nicks or dents) and debur the ends. -
Page 7: Braze Line Set
PREPARATION FOR NEXT STEP After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water−saturated cloths to both services valves to cool piping. Once piping is cool, remove all water−saturated cloths. FIGURE 8 Page 7 XC21 SERIES... -
Page 8: Step 3 −− Installing Indoor Expansion Valve
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. -
Page 9: Step 4 −− Leak Test And Evacuation
E. After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector. F. After leak testing, disconnect gauges from service ports. FIGURE 10 Page 9 XC21 SERIES... - Page 10 STEP 4 −− LEAK TEST AND EVACUATION (Continued) EVACUATION HIGH 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 OUTDOOR MANIFOLD...
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Page 11: Size Circuit And Install Disconnect Switch
(1.5M) NOTE Units are approved for use only with copper NOTE 24VAC, Class II circuit connections are made in the control box. conductors. Ground unit at disconnect switch or connect to an earth ground. FIGURE 12 Page 11 XC21 SERIES... - Page 12 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).
- Page 13 MAIN CONTROL. All unit setting changes must be done at the compressor has been OFF for 25 to 30 minutes. This MAIN CONTROL. The Lennox ComfortSense 7000 thermostat option is to help reduce the potential for ice build up on the may be used, as well as other non−communicating electronic−only...
- Page 14 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. Air Handler ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 XC21 Two−Stage Air Conditioner Control On−board link Low voltage thermostat wiring Flat metal jumper 1.
- Page 15 Furnace ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 XC21 Two−Stage Air Conditioner Control On−board link Low voltage thermostat wiring Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional). ® R to L connection is required for this model when using the ComfortSense 7000 −...
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Page 16: Tools Required
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. - Page 17 Note − Unit may have a low ambient control or control that locks in second−stage operation below its set point. It may be necessary to remove a wire from the control when performing this check. On the XC21 units, the System Operation Monitor controls the second−stage solenoid coil in compressor. Cooling Mode Operation − Block outdoor coil to maintain a minimum of 375 psig during testing.
- Page 18 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...
- Page 19 Cleaning of the outdoor unit’s coil should be performed by 1. Ask your Lennox dealer to show you where your indoor a licensed professional service technician (or equivalent). unit’s filter is located. It will be either at the indoor unit...