Lennox XC20-036-230-01 Manual

12015 Lennox Industries Inc.
Corp. 1407-L10
August 25, 2015
XC20
INSTALLATION AND SERVICE
PROCEDURE
Service Literature
Elite Series®XC20 Units
IMPORTANT
XC20 units have refrigerant piping requirements that are
unique to this unit. Size and install the refrigerant piping
per table 2 (page 14) to ensure proper unit operation.
This unit is an integral component of a system that requires an
iComfort Wi-Fi®or iComfort®S30 thermostat and
iComfort®-enabled air handler or furnace.
XC20
iComfort Wi-Fi®
thermostat
iComfort®-enabled
air handler or
furnace
IMPORTANT:
Before applying any power (main or low voltage) to the outdoor
unit, confirm that the iComfort Wi-Fi®or iComfort®S30
thermostat has software Version 2.1 or higher installed.
(Reference the iComfort Wi-Fi®or iComfort®S30 thermostat
manual.)
iComfort®S30
thermostat
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property. Installation and service must be
performed by a licensed professional installer (or
equivalent) or a service agency.
TABLE OF CONTENTS
I. OVERVIEW
Model Number Identification 2....................
Typical Serial Number Identification 2..............
Specifications 2.................................
Electrical Data 3................................
Unit Dimensions 4..............................
Typical Unit Parts Arrangement 5.................
Operating Service Valves 7.......................
General 7.....................................
II. INSTALLATION
Unit Placement 9...............................
Removing and Installing Panels 12.................
New or Replacement Line Set 13..................
Brazing Connections 16...........................
Flushing the System 19...........................
Leak Testing the System 21.......................
Evacuating the System 21.........................
Electrical 24.....................................
Servicing Unit Delivered Void of Charge 29..........
Unit Start-Up 29.................................
III. SYSTEM OPERATION AND SERVICE
7-Segment Alert and System Status Codes 30.......
Outdoor Control Push-Button Operation 38..........
Configuring Unit 42...............................
Reconfiguring Outdoor Control using iComfort Wi-Fi®or
iComfort®S30 Thermostat 43.....................
System Overview 43.............................
Maintenance 44..................................
Unit Wiring Diagrams 45..........................
Factory Wiring Diagrams 48.......................
Unit Sequence of Operations 50...................
Component Testing 53............................
System Refrigerant 75............................
Appendix - Charging Sticker ....................
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs AND HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.

2
XC20
I. OVERVIEW
Model Number Identification
C 20 036
− −
Unit Type
C = AIR CONDITIONER
Series
Nominal Cooling Capacity
024 = 2 tons
036 = 3 tons
048 = 4 tons
060 = 5 tons
Minor Revision Number
230
Voltage
230 = 208/230V-1ph-60hz
Refrigerant Type
X = R-410A
X-02
A
Ratings Revision Level
Typical Serial Number Identification
8 09 C
Year Code
08 = 2008
09 = 2009
10 = 2010
Month Code
A = January
B = February
C = March
05716
5 (or 6) Digit Unique Number
Location Code
19 = Saltillo, Mexico
58 = Marshalltown, IA
5
Specifications
Model Number
Unit Outdoor Fan
Sound Rating Number (dB)1Factory Refrigerant
Charge2Number of Blades Diameter - inches.
Maximum Minimum
XC20-024-230-01 72 65 7 lbs, 5 oz 4 22
Model Number
Unit Outdoor Fan
Sound Rating Number (dB)1Factory Refrigerant
Charge2Number of Blades Diameter - inches.
Maximum Minimum
XC20-036-230-01 75 67 8 lbs, 6 oz 4 22
Model Number
Unit Outdoor Fan
Sound Rating Number (dB)1Factory Refrigerant
Charge2Number of Blades Diameter - inches.
Maximum Minimum
XC20-048-230-01 77 68 10 lbs, 7 oz 4 22
Model Number
Unit Outdoor Fan
Sound Rating Number (dB)1Factory Refrigerant
Charge2Number of Blades Diameter - inches.
Maximum Minimum
XC20-060-230-01 77 69 12 lbs, 1 oz 3 26
1Tested according to AHRI Standard 270-2008 test conditions.
2Factory refrigerant charge is sufficient for refrigerant line lengths up to 15 feet.

3
XC20
Electrical Data
208/230V-60 Hz-1 Ph
Model Number
Unit Compressor Outdoor Fan (RPM varies with compressor RPM)
Maximum
Over-
current
Protection
(amps)1
Minimum
Circuity
Ampacity2
Rated
Load
Amps
(RLA)
Locked
Rotor
Amps
(LRA)
Motor
HP
CFM RPM WATTS Full
Load
Amps
(FLA)
MAX MIN MAX MIN MAX MIN
XC20-024-230-01 30 19.1 13.0 13.0 1/6 2600 1500 700 400 60 25 2.8
208/230V-60 Hz-1 Ph
Model Number
Unit Compressor Outdoor Fan (RPM varies with compressor RPM)
Maximum
Over-
current
Protection
(amps)1
Minimum
Circuity
Ampacity2
Rated
Load
Amps
(RLA)
Locked
Rotor
Amps
(LRA)
Motor
HP
CFM RPM WATTS Full
Load
Amps
(FLA)
MAX MIN MAX MIN MAX MIN
XC20-036-230-01 30 20.6 14.2 13.0 1/4 3600 3100 700 600 115 80 2.8
208/230V-60 Hz-1 Ph
Model Number
Unit Compressor Outdoor Fan (RPM varies with compressor RPM)
Maximum
Over-
current
Protection
(amps)1
Minimum
Circuity
Ampacity2
Rated
Load
Amps
(RLA)
Locked
Rotor
Amps
(LRA)
Motor
HP
CFM RPM WATTS Full
Load
Amps
(FLA)
MAX MIN MAX MIN MAX MIN
XC20-048-230-01 50 29.1 21.0 20.0 1/3 4000 3000 800 600 160 70 2.8
208/230V-60 Hz-1 Ph
Model Number
Unit Compressor Outdoor Fan (RPM varies with compressor RPM)
Maximum
Over-
current
Protection
(amps)1
Minimum
Circuity
Ampacity2
Rated
Load
Amps
(RLA)
Locked
Rotor
Amps
(LRA)
Motor
HP
CFM RPM WATTS Full
Load
Amps
(FLA)
MAX MIN MAX MIN MAX MIN
XC20-060-230-01 50 29.3 21.2 20.0 1/3 4325 2900 865 600 195 80 2.8
1HACR type circuit breaker or fuse.
2Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

4
XC20
Unit Dimensions -- Inches (mm)
BASE WITH ELONGATED LEGS
DISCHARGE AIR
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
4−1/4(108) 4−3/4
(121)
39−3/8 (1000)
ELECTRICAL
INLETS
A
1 (25)
2 (51)
35−1/2 (902)
Model No. A
in. mm
XC20−024 39 991
XC20−036 39 991
XC20−048 45 1143
XC20−060 45 1143
SIDE VIEW
END VIEW
UNIT SUPPORT
FEET
16−7/8
(429)
26−7/8
(683)
30−3/4 (781)
3−1/8
(79)
8−3/4
(222) )3−3/4 (95
4−5/8
(117)
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin.
Coils previously charged with HCFC-22 must be
flushed.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take care
while handling this equipment and use protective
clothing.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit
must be grounded in accordance with national and local
codes.
Line voltage is present at all components when unit is not
in operation on units with single‐pole contactors.
Disconnect all remote electric power supplies before
opening access panel. Unit may have multiple power
supplies.
WARNING
Electrical Hazard
High Voltage
Wait 5 Minutes
Electrical components may hold charge. Do
not remove this panel or service this area for
5 minutes after the power has been
removed.

5
XC20
Typical Unit Parts Arrangement
GROUND LUG
OUTDOOR
CONTROL
INVERTER REACTOR
DC INVERTER
CONTROL
CONTACTOR-SPST
GROUND LUG
CONTACTOR-SPST
OUTDOOR CONTROL
INVERTER NOISE FILTER
INVERTER REACTOR
CONTROL PANEL FOR
XC20-024 AND -036
CONTROL PANEL FOR
XC20-048 AND -060
DC INVERTER
CONTROL
Figure 1. Control Panel Components

6
XC20
Typical Plumbing Components
DRIER
(ONE WAY - HFC-410A)
CRANKCASE HEATER THERMOSTAT
(S40) OPENS AT 70ºF, CLOSES AT 50ºF
COMPRESSOR TOP CAP
SWITCH (THERMAL) COMPRESSOR
LIQUID LINE SENSOR
SERVICE VALVE SERVICE VALVE
HIGH PRESSURE
SWITCH
LOW PRESSURE
SWITCH
Figure 2. Plumbing Component Locations
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin.
Coils previously charged with HCFC-22 must be
flushed.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take care
while handling this equipment and use protective
clothing.

7
XC20
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.
Line voltage is present at all components
when unit is not in operation on units with
single‐pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
The XC20 is a high-efficiency residential split-system air
conditioner, which features a variable-capacity scroll com
pressor and uses HFC-410A refrigerant. Units are
available in 2, 3, 4 and 5-ton sizes. The series is designed
for use with an expansion valve (approved for use with
HFC-410A) in the indoor unit only.
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant sys
tems must be capable of handling higher system operating
pressures. The gauges should be rated for use with pres
sures of 0 - 800 psig on the high side and a low side of 30”
vacuum to 250 psig, with dampened speed to 500 psi.
Gauge hoses must be rated for use at or up to 800 psig of
pressure with a 4000 psig burst rating.
Table 1. Torque Requirements
Parts Recommended Torque
Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #10 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
TORQUE REQUIREMENTS
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 lists
torque values for fasteners.
Operating Service Valves
The liquid and vapor line service valves are used for re
moving refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a fac
tory-installed valve stem. Figure 3 provides information on
how to access and operating both angle and ball service
valves.
IMPORTANT
Only use hex wrenches of sufficient hardness (50Rc -
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory-torqued (from 9 ft-lbs for
small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using a
hex wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
See the Lennox Service and Application Note #C-08-1
for further details and information.
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.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.

8
XC20
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
SERVICE PORT CORE
SERVICE PORT CAP
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
TO OUTDOOR UNIT
STEM CAP
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
TO INDOOR
UNIT
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
BALL (SHOWN
CLOSED)
SERVICE PORT
CORE
TO INDOOR UNIT
TO OUTDOOR
UNIT
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CAP
STEM CAP
VALVE
STEM
SERVICE VALVES ANGLE AND BALL
Operating Angle–Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back
the stem out counterclockwise as far as it will go.
Operating Ball Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open valve,
rotate stem counterclockwise 90°. To close, rotate stem
clockwise 90°.
12
3
4
5
6
7
8
9
10
11 12
1/12 TURN
To Access Service Port:
A service port cap protects the service port core from contamination and
serves as the primary leak seal.
1. Remove service port cap with an appropriately sized wrench.
2. Connect gauge set to service port.
3. When testing is completed, replace service port cap and tighten as
follows:
DWith torque wrench: Finger tighten and
torque cap per table 1.
DWithout torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
12
3
4
5
6
7
8
9
10
11 12
1/6 TURN
When service valve is CLOSED, the service port is open
to the line set and indoor unit.
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
DWith Torque Wrench: Finger tighten and then
torque cap per table 1.
DWithout Torque Wrench: Finger tighten and
use an appropriately sized wrench to turn an
additional 1/12 turn clockwise.
NOTE - A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
Figure 3. Angle and Ball-Type Service Valves

9
XC20
II. INSTALLATION
Unit Placement
CAUTION
This unit may weigh up to 320 lbs. It could take more than
two people to lift this product. Take proper precautions
when lifting heavy objects.
See Unit Dimensions on page 4 for sizing mounting slab,
platforms or supports. Refer to figure 4 for mandatory
installation clearance requirements.
POSITIONING CONSIDERATIONS
Consider the following when positioning the unit:
DSome localities are adopting sound ordinances based
on the unit sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
DWhen possible, do not install the unit directly outside
a window. Glass has a very high level of sound trans
mission. For proper placement of unit in relation to a
window see figure 5, detail A.
PLACING UNIT ON SLAB
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 5, de
tail B.
NOTE - If necessary for stability, anchor unit to slab as de
scribed in figure 5, detail D.
ELEVATING THE UNIT
Units are outfitted with elongated support feet as illustrated
in figure 5, detail C.
If additional elevation is necessary, raise the unit by ex
tending the height of the unit support feet. Use a 2-inch
(50.8mm) Schedule 40 female threaded adapter to raise
the height of the unit.
The specified coupling will fit snugly into the recessed por
tion of the feet. Use additional 2-inch (50.8mm) Schedule
40 male threaded adaptors which can be threaded into the
female threaded adaptors to make additional adjustments
to the level of the unit.
NOTE - Keep the height of extenders short enough to en
sure a sturdy installation. If it is necessary to extend the
height further than what is stable, consider a different type
of field-fabricated framework that is sturdy enough for
greater heights.
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See
NOTES
See NOTES NOTES:
Service clearance of 30 in. must be maintained on one of the sides
adjacent to the control box.
Clearance to one of the other three sides must be 36 in.
Clearance to one of the remaining two sides may be 12 in. and the
final side may be 6 in.
A clearance of 24 in. must be maintained between two units.
48 in. clearance required on top of unit.
See
NOTES
See NOTES Control
Box
NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for
the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may
have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be
required to prevent air recirculation when the unit is installed under a deck or in another tight space.)
Figure 4. Installation Clearances

10
XC20
STABILIZING UNIT ON UNEVEN SURFACES
IMPORTANT
Unit Stabilizer Bracket Use (field-provided):
Always use stabilizers when unit is raised above the
factory height. (Elevated units could become unstable in
gusty wind conditions.)
Stabilizers may be used on factory height units when
mounted on unstable an uneven surface.
1. Remove the louvered panel from each side to expose
the unit base.
2. Install the brackets as illustrated in figure 5, detail D us
ing conventional practices.
3. Replace the panels after installation is complete.
ROOF MOUNTING
Locate the unit above a load-bearing wall or area of the roof
that can adequately support the unit. Consult local codes
for rooftop applications.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.