Lennox XC13 Series Installation and operation manual

Page 1 ©2005 Lennox Industries Inc.
Corp. 0521−L9 XC13
Service Literature Revised 12−2005
XC13 SERIES UNITS
The XC13 is a high efficiency residential split−system con-
densing unit, which features a scroll compressor and
R−410A refrigerant. XC13 units are available in sizes rang-
ing from 1 1/2 through 5 tons. The series is designed for use
with an expansion valve or RFC (approved for use with
R−410A) in the indoor unit. This manual is divided into sec-
tions which discuss the major components, refrigerant sys-
tem, charging procedure, maintenance and operation se-
quence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
WARNING
Warranty will be voided if covered equipment is re-
moved from original installation site. Warranty will
not cover damage or defect resulting from:
Flood, wind, lightning, or installation and operation
in a corrosive atmosphere (chlorine, fluorine, salt,
recycled waste water, urine, fertilizers, or other dam-
aging chemicals).
DANGER
Shock Hazard
Remove all power at disconnect
before removing access panel.
Single phase XC13 units use single-
pole contactors. Potential
exists for electrical shock resulting
in injury or death.
Line voltage exist at all components
(even when unit is not in operation).
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R410A.
TABLE OF CONTENTS
General Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data Page 2. . . . . . . .
I Application Page 3. . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components Page 3. . . . . . . . . . . . . . . . . .
III Refrigeration System Page 7. . . . . . . . . . . . . .
IV Charging Page 8. . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery Page 13. . . . . . . . . . . . .
VI Maintenance Page 13. . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 14.

Page 2
SPECIFICATIONS
General
Dt
Model No. XC13−018 XC13−024 XC13−030 XC13−036 XC13−042 XC13−048 XC13−060
Data Nominal Tonnage 1.5 2 2.5 3 3.5 4 5
Connections
(t)
Liquid line (o.d.) − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
(sweat) Suction line (o.d.) − in. (mm) 3/4 (19.1) 3/4 (19.1) 3/4 (19.1) 7/8 (22.2) 7/8 (22.2) 7/8 (22.2) 1−1/8 (28.6)
Refrigerant 1R−410A charge furnished 4 lbs. 10 oz.
(2.1 kg)
5 lbs. 6 oz.
(2.44 kg)
7 lbs. 2 oz.
(3.23 kg)
7 lbs. 4 oz.
(3.29 kg)
8 lbs. 10 oz.
(3.91 kg)
9 lbs. 2 oz.
(4.14 kg)
12 lbs. 6 oz.
(5.61 kg)
Outdoor
Cil
Net face area
ft ( 2)
Outer coil 13.22 (1.23) 15.11 (1.40) 13.22 (1.23) 18.67 (1.73) 16.33 (1.52) 16.33 (1.52) 24.50 (2.28)
Coil sq. ft. (m2) Inner coil − − − − − − 12.65 (1.18) − − − 15.76 (1.46) 15.76 (1.46) 23.64 (2.19)
Tube diameter − in. (mm) 5/16 (8) 5/16 (8) 5/16 (8) 5/16 (8) 5/16 (8) 5/16 (8) 5/16 (8)
No. of rows 1 1 2 1 2 2 2
Fins per inch (m) 22 (867) 22 (867) 22 (867) 22 (867) 22 (867) 22 (867) 22 (867)
Outdoor
F
Diameter − in. (mm) 18 (457) 18 (457) 18 (457) 22 (559) 22 (559) 22 (559) 22 (559)
Fan No. of blades 3 3 3 3 4 4 4
Motor hp (W) 1/10 (75) 1/10 (75) 1/5 (149) 1/5 (149) 1/6 (124) 1/6 (124) 1/4 (186)
Cfm (L/s) 2360 (1115) 2330 (1100) 2320 (1095) 3440 (1625) 3060 (1445) 3060 (1445) 3980 (1880)
Rpm 1055 1050 1130 1055 845 845 836
Watts 150 140 165 220 215 215 305
Shipping Data − lbs. (kg) 1 pkg. 158 (72) 166 (75) 179 (81) 211 (96) 232 (105) 232 (105) 285 (129)
ELECTRICAL DATA
Line voltage data − 60hz − 1 phase 208/230V 208/230V 208/230V 208/230V 208/230V 208/230V 208/230V
2Maximum overcurrent protection (amps) 20 30 30 35 40 50 60
3Minimum circuit ampacity 11.9 17.5 18.7 21.9 23.2 28.3 34.6
Compressor Rated load amps 8.97 13.46 14.1 16.67 17.69 21.79 26.28
p
Locked rotor amps 48 58 73 79 107 117 134
Power factor 0.98 0.98 0.98 0.99 0.99 0.99 0.99
Outdoor Fan
Mt
Full load amps 0.7 0.7 1.1 1.1 1.1 1.1 1.7
Motor Locked Rotor Amps 1.4 1.4 2 2 2.1 2.1 3.1
OPTIONAL ACCESSORIES - must be ordered extra
Compressor Crankcase Heater 67K90       Furnished
Compressor Hard Start Kit 10J42 
p
88M91      
Compressor Low Ambient Cut−Off 45F08       
Compressor Time−Off Control 47J27       
Freezestat 3/8 in. tubing 93G35       
1/2 in. tubing 39H29       
5/8 in. tubing 50A93       
Low Ambient Kit 34M72       
Mounting Base 69J07       
Refrigerant
Line Sets
L15−41−20
L15−41−30
L15−41−40
L15−41−50
  
L15−65−30
L15−65−40
L15−65−50
  
Field Fabricate 
Time Delay Relay 58M81       
NOTE − Extremes of operating range are plus 10% and minus 5% of line voltage.
1Refrigerant charge sufficient for 15 ft. (4.6 m) length of refrigerant lines.
2Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
3HACR type breaker or fuse.

Page 3
I − APPLICATION
XC13 condensing units are available in 1 1/2, 2, 2 -1/2, 3,
3 -1/2, 4 and 5 ton capacities. All major components (indoor
blower and coil) must be matched according to Lennox rec-
ommendations for the compressor to be covered under war-
ranty. Refer to the Engineering Handbook for approved sys-
tem matchups.
II − UNIT COMPONENTS
Unit components are illustrated in figure 1.
XC13 PARTS ARRANGEMENT
FIGURE 1
DUAL CAPACITOR
CONTACTOR
OUTDOOR FAN
COMPRESSOR
HIGH PRESSURE
SWITCH
FILTER DRIER
CAUTION
To prevent personal injury, or damage to panels, unit
or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow
all removed panels out of the way, so that the panels
will not cause injury to personnel, nor cause damage
to objects or structures nearby, nor will the panels be
subjected to damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions, especially windy conditions, that
may cause panels to be blown around and battered.
Remove the louvered panels as follows:
1.Remove 2 screws, allowing the panel to swing open slight-
ly (see figure 2).
Detail
A
Detail C
Detail
B
FIGURE 2
Removing/Installing Louvered Panels
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT
AS POSSIBLE) WHILE INSTALLING PANEL.
PREFERRED ANGLE
FOR INSTALLATION
Detail D
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE PANEL
SCREW
HOLES
ANGLE MAY BE TOO
EXTREME
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
LIP
IMPORTANT! Do not allow panels to hang on unit by top tab. Tab
is for alignment and not designed to support weight of panel.
Panel shown slightly rotated to allow top tab to exit (or enter) top
slot for removing (or installing) panel.
2.Hold the panel firmly throughout this procedure. Ro-
tate bottom corner of panel away from hinge corner post
until lower 3 tabs clear the slots (see figure 2, Detail B).
3.Move panel down until lip of upper tab clears the top slot
in corner post (see figure 2, Detail A).

Page 4
Position and Install PanelPosition the panel almost par-
allel with the unit (figure 2, Detail D) with the screw side" as
close to the unit as possible. Then, in a continuous motion:
Slightly rotate and guide the lip of top tab inward (figure 2,
Details A and C); then upward into the top slot of the
hinge corner post.
Rotate panel to vertical to fully engage all tabs.
Holding the panel’s hinged side firmly in place, close the
right−hand side of the panel, aligning the screw holes.
When panel is correctly positioned and aligned, insert the
screws and tighten.
A − Control Box (Figure 3)
XC13 units are not equipped with a 24V transformer. All 24
VAC controls are powered by the indoor unit. Refer to wir-
ing diagram.
Electrical openings are provided under the control box cov-
er. Field thermostat wiring is made to color-coded pigtail
connections.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com-
ponents. Take precautions during unit installation
and service to protect the unit’s electronic controls.
Precautions will help to avoid control exposure to
electrostatic discharge by putting the unit, the con-
trol and the technician at the same electrostatic po-
tential. Neutralize electrostatic charge by touching
hand and all tools on an unpainted unit surface be-
fore performing any service procedure.
FIGURE 3
DUAL CAPACITOR
(C12)
COMPRESSOR
CONTACTOR
(K1)
CONTROL BOX
GROUNDING
LUG
TIMED OFF
CONTROL.
(OPTION)
1 − Compressor Contactor K1
The compressor is energized by a single−pole contactor lo-
cated in the control box. See figure 3. K1 is energized by the
indoor thermostat terminal Y1 (24V) when thermostat de-
mand is present.
2 − Dual Capacitor C12
The compressor and fan in XC13 series units use perma-
nent split capacitor motors. The capacitor is located in-
side the unit control box (see figure 3). A single dual" ca-
pacitor (C12) is used for both the fan motor and the com-
pressor (see unit wiring diagram). The fan side and the
compressor side of the capacitor have different MFD rat-
ings. See side of capacitor for ratings.
3 − Timed Off Control TOC (option)
The time delay is electrically connected between thermostat
terminal Y and the compressor contactor. Between cycles,
the compressor contactor is delayed for 5 minutes ±2 min-
utes but may last as long as 8 minutes. At the end of the
delay, the compressor is allowed to energize. When thermo-
stat demand is satisfied, the time delay opens the circuit to
the compressor contactor coil and the compressor is de−en-
ergized.
B − Compressor
The scroll compressor used in all XC13 model units, are de-
signed for use with R410A refrigerant and operation at high
pressures. Compressors are shipped from the factory
charged with 3MA (32MMMA) P.O.E. oil.
See ELECTRICAL DATA table at the front of this manual or
compressor nameplate for compressor specifications.
The scroll compressor design is simple, efficient and requires
few moving parts. A cutaway diagram of the scroll compressor
is shown in figure 4. The scrolls are located in the top of the
compressor can and the motor is located just below. The oil lev-
el is immediately below the motor.
FIGURE 4
SCROLL COMPRESSOR
DISCHARGE
SUCTION

Page 5
The scroll is a simple compression concept centered around
the unique spiral shape of the scroll and its inherent properties.
Figure 5 shows the basic scroll form. Two identical scrolls are
mated together forming concentric spiral shapes (figure 6). One
scroll remains stationary, while the other is allowed to "orbit" (fig-
ure 7). Note that the orbiting scroll does not rotate or turn but
merely orbits the stationary scroll.
NOTE − During operation, the head of a scroll compressor may
be hot since it is in constant contact with discharge gas.
FIGURE 5
SCROLL FORM
FIGURE 6
STATIONARY SCROLL
ORBITING SCROLL
DISCHARGE
SUCTION
CROSS−SECTION OF SCROLLS
TIPS SEALED BY
DISCHARGE PRESSURE
DISCHARGE
PRESSURE
12
34
SUCTION
POCKET
SUCTION
ORBITING SCROLL
STATIONARY SCROLL
SUCTION SUCTION
DISCHARGE
POCKET
SUCTION INTERMEDIATE PRESSURE
GAS
CRESCENT
SHAPED
GAS POCKET
HIGH PRESSURE GAS
FLANKS SEALED
BY CENTRIFUGAL
FORCE
MOVEMENT OF ORBIT
FIGURE 7

Page 6
The counterclockwise orbiting scroll draws gas into the outer
crescent shaped gas pocket created by the two scrolls (figure 7
− 1). The centrifugal action of the orbiting scroll seals off the
flanks of the scrolls (figure 7 − 2). As the orbiting motion contin-
ues, the gas is forced toward the center of the scroll and the gas
pocket becomes compressed (figure 7 − 3). When the com-
pressed gas reaches the center, it is discharged vertically into a
chamber and discharge port in the top of the compressor (figure
6). The discharge pressure forcing down on the top scroll helps
seal off the upper and lower edges (tips) of the scrolls (figure 6).
During a single orbit, several pockets of gas are compressed
simultaneously providing smooth continuous compression.
The scroll compressor is tolerant to the effects of liquid return. If
liquid enters the scrolls, the orbiting scroll is allowed to separate
from the stationary scroll. The liquid is worked toward the center
of the scroll and is discharged. If the compressor is replaced,
conventional Lennox cleanup practices must be used.
Due to its efficiency, the scroll compressor is capable of draw-
ing a much deeper vacuum than reciprocating compressors.
Deep vacuum operation can cause internal fusite arcing
resulting in damaged internal parts and will result in com-
pressor failure. Never use a scroll compressor for eva-
cuating or pumping−down" the system. This type of dam-
age can be detected and will result in denial of warranty
claims.
The scroll compressor is quieter than a reciprocating com-
pressor, however, the two compressors have much different
sound characteristics. The sounds made by a scroll compres-
sor do not affect system reliability, performance, or indicate
damage.
C − Drier
A filter drier designed for all XC13 model units must be
installed in the liquid line. The factory installed drier is de-
signed to remove moisture, which can lead to compressor
failure. Any time unit is exposed to open air due to ser-
vice, drier must be replaced. All replacement driers
must be approved for R410A refrigerant.
D − Condenser Fan Motor
All units use single−phase PSC fan motors which require a run
capacitor. In all units, the condenser fan is controlled by
the compressor contactor.
ELECTRICAL DATA tables in this manual show specifi-
cations for condenser fans used in XC13’s.
Access to the condenser fan motor on all units is gained
by removing the four screws securing the fan assembly.
See figure 8. The grill fan assembly can be removed from
the cabinet as one piece. See figure 9. The condenser fan
motor is removed from the fan guard by removing the four
nuts found on top of the grill. See figure 9 if condenser fan
motor replacement is necessary.
Make sure all power is disconnected before
beginning electrical service procedures.
DANGER
FIGURE 8
Remove
screws
Remove
screws
ALIGN FAN HUB FLUSH WITH END OF SHAFT
FIGURE 9
E − Loss of Charge Switch
The loss of charge switch is NC, auto re−set and located on
the discharge line of the compressor. The switch opens
when discharge line temperatures exceeds the factory set-
ting of 220° + 5° F and shuts down the compressor.
F − High Pressure Switch
XC13 units are equipped with a high pressure switch that is
located in the liquid line of the compressor. The switch
(SPST, manual reset, normally closed) removes power from
the compressor contactor control circuit when discharge
pressure rises above factory setting at 590 + 10 psi.

Page 7
III − REFRIGERANT SYSTEM
A − Plumbing
Field refrigerant piping consists of liquid and suction lines
from the condensing unit (sweat connections) to the indoor
evaporator coil (sweat connections). Use Lennox L15
(sweat) series line sets as shown in table 1.
TABLE 1
Unit Liquid
Line
Suction
Line
L15 Line
Sets
018, −024,
−030,
3/8 in.
(10 mm)
3/4 in.
(19 mm)
L15−41
20 ft. − 50 ft.
(6 m − 15 m)
−036, −042,
−048
3/8 in.
(10 mm)
7/8 in.
(22 mm)
L15−65
30 ft. − 50 ft.
(9 m − 15 m)
−060 3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
Field
Fabricated
The liquid line and vapor line service valves (figures 10 and
11) and gauge ports are accessible from the outside of the
unit. Use the service ports for leak testing, evacuating,
charging and checking charge.
Each valve is equipped with a service port which has a facto-
ry−installed Schrader valve. A service port cap protects the
Schrader valve from contamination and serves as the pri-
mary leak seal. Service valves are not rebuildable. If a valve
has failed, you must replace it.
To Access Schrader Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − When testing is complete, replace service port cap. Tight-
en finger tight, then an additional 1/6 turn.
To Open Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Using the adjustable wrench to keep the valve station-
ary, use a service wrench with a hex−head extension to
back the stem out counterclockwise as far as it will go.
NOTE − Use a 3/16" hex head extension for 3/8" line
sizes or a 5/16" extension for large line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 turn.
To Close Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Using the adjustable wrench to keep the valve station-
ary, use a service wrench with a hex−head extension to
turn the stem clockwise to seat the valve. Tighten the
stem firmly.
NOTE − Use a 3/16" hex head extension for 3/8" line
sizes or a 5/16" extension for large line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
NOTE − Stem cap must be replaced to help prevent
valve leakage.
Service Valve
(Valve Closed)
Schrader valve open
to line set when valve is
closed (front seated)
service
port
service
port cap
stem cap
insert hex
wrench here
(valve front seated)
to outdoor coil
to indoor coil
Service Valve
(Valve Open)
Schrader
valve
service
port
service port
cap
insert hex
wrench here
to indoor coil
to outdoor coil
stem cap
FIGURE 10
Vapor Line Ball Valve – 5 Ton Units Only
Vapor line service valves function the same way as the other
valves, the difference is in the construction. A ball valve is
illustrated in figure 11.
The ball valve is equipped with a service port with a factory−
installed Schrader valve. A service port cap protects the
Schrader valve from contamination and assures a leak−free
seal.

Page 8
Ball Valve (Valve Open)
FIGURE 11
Schrader valve
service port
service port
cap
stem cap
stem
Use Adjustable Wrench
To open: rotate Stem Clockwise 90°.
To close: rotate Stem Counter-clockwise 90°.
ball
(shown open)
to outdoor coil
to indoor coil
IV − CHARGING
WARNING
R−410A refrigerant can be harmful if it is inhaled.
R−410A refrigerant must be used and recovered re-
sponsibly.
Failure to follow this warning may result in personal
injury or death.
A − Leak Testing
After the line set has been connected to the indoor and out-
door units, check the line set connections and indoor unit
for leaks.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of (CFC’s and HFC’s) as of July 1, 1992. Approved
methods of recovery, recycling or reclaiming must be
followed. Fines and/or incarceration my be levied for
noncompliance.
WARNING
Danger of explosion: Can cause
equipment damage, injury or death.
Never use oxygen to pressurize a re-
frigeration or air conditioning system.
Oxygen will explode on contact with
oil and could cause personal injury.
WARNING
Danger of explosion: Can cause equipment damage,
injury or death. When using a high pressure gas such
as dry nitrogen to pressurize a refrigeration or air con-
ditioning system, use a regulator that can adjust the
pressure from 0 to 450 psig ( 3103 kPa).
Using an Electronic Leak Detector
1 − Connect a cylinder of R−410A to the center port of the
manifold gauge set. Connect manifold gauge to service
valve port.
2 − With both manifold valves closed, open the valve on the
R−410A cylinder.
3 − Open the high pressure side of the manifold to allow the
R−410A into the line set and indoor unit. Weigh in a trace
amount of R−410A. [A trace amount is a maximum of 2
ounces (57 g) or 3 pounds (31 kPa) pressure.] Close the
valve on the R−410A cylinder and the valve on the high
pressure side of the manifold gauge set. Disconnect the
R−410A cylinder.
4 − Connect a cylinder of nitrogen with a pressure regulat-
ing valve to the center port of the manifold gauge set.
5 − Connect the manifold gauge set high pressure hose to
the vapor valve service port. (Normally, the high pres-
sure hose is connected to the liquid line port; however,
connecting it to the vapor port better protects the man-
ifold gauge set from high pressure damage.)
6 − Adjust the nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
set which will pressurize line set and indoor unit.
7 − After a few minutes, open a refrigerant port to ensure
the refrigerant you added is adequate to be detected.
(Amounts of refrigerant will vary with line lengths.)
Check all joints for leaks. Purge nitrogen and R−410A
mixture. Correct any leaks and recheck.
B − Evacuating
Evacuating the system of noncondensables is critical for
proper operation of the unit. Noncondensables are defined
as any gas that will not condense under temperatures and
pressures present during operation of an air conditioning
system. Noncondensables and water vapor combine with
refrigerant to produce substances that corrode copper pip-
ing and compressor parts.
NOTE − This evacuation process is adequate for a new
installation with clean and dry lines. If excessive mois-
ture is present, the evacuation process may be required
more than once.

Page 9
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
that reads from 50 microns to at least 10,000 microns.
1 − Connect manifold gauge set to the service valve ports :
 low pressure gauge to vapor line service valve
 high pressure gauge to liquid line service valve
2 − Connect micron gauge.
3 − Connect the vacuum pump (with vacuum gauge) to the
center port of the manifold gauge set.
4 − Open both manifold valves and start the vacuum
pump.
5 − Evacuate the line set and indoor unit to an absolute
pressure of 23,000 microns (29.01 inches of mercury).
During the early stages of evacuation, it is desirable to
close the manifold gauge valve at least once to deter-
mine if there is a rapid rise in absolute pressure. A rap-
id rise in pressure indicates a relatively large leak. If this
occurs, repeat the leak testing procedure.
NOTE − The term absolute pressure means the total
actual pressure within a given volume or system, above
the absolute zero of pressure. Absolute pressure in a
vacuum is equal to atmospheric pressure minus vacu-
um pressure.
6 − When the absolute pressure reaches 23,000 microns
(29.01 inches of mercury), close the manifold gauge
valves, turn off the vacuum pump and disconnect the
manifold gauge center port hose from vacuum pump.
Attach the manifold center port hose to a nitrogen cylin-
der with pressure regulator set to 150 psig (1034 kPa)
and purge the air from the hose with nitrogen. Open the
manifold gauge valves to break the vacuum in the line
set and indoor unit. Close the manifold gauge valves.
CAUTION
Danger of Equipment Damage.
Avoid deep vacuum operation. Do not use compres-
sors to evacuate a system.
Extremely low vacuums can cause internal arcing and
compressor failure.
Damage caused by deep vacuum operation will void
warranty.
7 − Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold gauge
valves to release the nitrogen from the line set and in-
door unit.
8 − Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line set
and indoor unit until the absolute pressure does not rise
above 500 microns (29.9 inches of mercury) within a
20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
9 − When the absolute pressure requirement above has
been met, disconnect the manifold hose from the vacu-
um pump and connect it to an upright cylinder of R−410A
refrigerant. Open the manifold gauge valves to break the
vacuum from 1 to 2 psig positive pressure in the line set
and indoor unit. Close manifold gauge valves and shut
off the R−410A cylinder and remove the manifold gauge
set.
C − Charging
NOTES −
R−410A refrigerant cylinders are rose−colored. Re-
frigerant should be added through the vapor valve
in the liquid state.
Certain R−410A cylinders are identified as being
equipped with a dip tube. These allow liquid refrig-
erant to be drawn from the bottom of the cylinder
without inverting the cylinder. DO NOT turn this type
cylinder upside−down to draw refrigerant.
TABLE 2
Approach Values
XC13
Model −018 −024 −030 −036 −042 −048 −060
Temp.
°F (°C) 12
(6.7)
12
(6.7)
7
(4)
10
(5.5)
7
(4)
7
(4)
9
(5)
Liquid Line Temperature F (C)
Outdoor Ambient Temperature F (C)
=Approach Value F (C)
IMPORTANT
Use table 6 to perform maintenance checks. Table 6 is
not a procedure for charging the system. Minor varia-
tions in these pressures may be due to differences in
installations. Significant deviations could mean that
the system is not properly charged or that a problem
exists with some component in the system.
This system is charged with R−410A refrigerant which oper-
ates at much higher pressures than R−22. The installed liq-
uid line filter drier is approved for use with R−410A. Do not
replace it with components designed for use with R−22. This
unit is NOT approved for use with coils which use capillary
tubes as a refrigerant metering device.

Page 10
Factory Charge
Units are factory charged with the amount of R−410A refrig-
erant indicated on the unit rating plate. This charge is based
on a matching indoor coil and outdoor coil with 15 ft. (4.6 m)
line set. For varying lengths of line set, refer to table 3 for re-
frigerant charge adjustment.
TABLE 3
Refrigerant Charge per Line Set Lengths
Liquid Line
Set Diameter
Oz. per 5 ft. (g per 1.5 m) adjust
from 15 ft. (4.6 m) line set*
3/8 in. (9.5 mm) 3 ounce per 5 ft. (85 g per 1.5 m)
*If line length is greater than 15 ft. (4.6 m), add this amount.
If line length is less than 15 ft. (4.6 m), subtract this
amount.
IMPORTANT
Mineral oils are not compatible with R−410A. If oil
must be added, it must be a polyol ester oil.
The compressor is charged with sufficient polyol es-
ter oil for approved line set lengths.
Units Delivered Void of Charge
If the system is void of refrigerant, clean the system using
the procedure described below.
1 − Use dry nitrogen to pressurize the system and check for
leaks. Repair leaks, if possible.
2 − Evacuate the system to remove as much of the moisture
as possible. Use dry nitrogen to pressurize the system
and check for leaks. Repair leaks, if possible.
3 − Use dry nitrogen to break the vacuum and install the pro-
vided filter drier in the system.
4 − Evacuate the system again. Then, weigh the appropriate
amount of R−410A refrigerant (listed on unit nameplate)
into the system.
5 − Monitor the system to determine the amount of moisture
remaining in the oil. Use test kit 10N46 to verify that the
moisture content is within the kit’s dry color range. It
may be necessary to replace the filter drier several
times to achieve the required dryness level.
If system dryness is not verified, the compressor
will fail in the future.
Checking Charge
The outdoor unit should be charged during warm weather.
However, applications arise in which charging must occur in
the colder months. The method of charging is determined by
the unit’s refrigerant metering device and the outdoor
ambient temperature.
Measure the liquid line temperature and the outdoor ambi-
ent temperature as outlined below:
1 − Connect the manifold gauge set to the service valves:
low pressure gauge to vapor valve service port
high pressure gauge to liquid valve service port
2 − Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of R−410A .
3 − Set the room thermostat to call for heat. This will create
the necessary load for properly charging the system in
the cooling cycle.
4 − Record outdoor ambient temperature using a digital ther-
mometer.
5 − When the heating demand has been satisfied, switch the
thermostat to cooling mode with a set point of 68F
(20C). When pressures have stabilized, use a digital
thermometer to record the liquid line temperature.
6 − The outdoor temperature will determine which charging
method to use. Proceed with the appropriate charging
procedure.
Charge Using Weigh-in Method, Fixed Orifice or
TXV SystemsOutdoor Temp. < 65ºF (18ºC)
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, first, locate and repair any leaks and
then weigh in the refrigerant charge into the unit.
1 − Recover the refrigerant from the unit.
2 − Conduct leak check; evacuate as previously outlined.
3 − Weigh in the unit nameplate charge. If weighing facilities
are not available or if charging the unit during warm
weather, use one of the following procedures.

Page 11
Charge Using Subcooling Method, Fixed Orifice
SystemsOutdoor Temp. > 65ºF (18ºC)
If charging a fixed orifice system when the outdoor ambient
is 65F (18C) or above, use the subcooling method to
charge the unit.
NOTE − To determine saturation temperature/pressure, use
the R−410A temperature/pressure chart (table 4).
1 − With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital thermom-
eter to record the liquid line temperature.
2 − At the same time, record the liquid line pressure reading.
3 − Determine the saturation temperature for the liquid line
pressure reading. See table 4.
4 − Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine sub-
cooling.
5 − Compare the subcooling value with those in table 5. If
subcooling is greater than shown, recover some refrig-
erant. If subcooling is less than shown, add some refrig-
erant.
TABLE 4
R−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig
32 100.8 64 181.6 96 299.4 126 451.8
34 105.0 66 187.7 98 308.2 128 463.5
36 109.2 68 194.1 100 317.2 130 475.6
38 113.6 70 200.6 102 326.4 132 487.8
40 118.0 72 207.2 104 335.7 134 500.2
42 122.6 74 214.0 106 345.3 136 512.9
44 127.3 76 220.9 108 355.0 138 525.8
46 132.2 78 228.0 110 365.0 140 539.0
48 137.1 80 235.3 112 375.1 142 552.3
50 142.2 82 242.7 114 385.4 144 565.9
52 147.4 84 250.3 116 396.0 146 579.8
54 152.8 86 258.0 118 406.7 148 593.8
56 158.2 88 266.0 120 417.7 150 608.1
58 163.9 90 274.1 122 428.8 152 622.7
60 169.6 92 282.3 124 440.2 154 637.5
62 195.5 94 290.8 126 451.8 156 652.4
TABLE 5
XC13 Subcooling Values − Fixed Orifice Systems
Model −018 −024 −030 −036 −042 −048 −060
Outdoor
Temperature
°F (°C)
Saturation Temperature F (C)
Liquid Line Temperature F (C)
=Subcooling Value F (C)
65 (18) 8 (4.4) 14 (7.7) 10 (5.5) 10 (5.5) 13 (7.2) 15 (8.3) 11 (6)
70 (18) 4 (2.2) 13 (7.2) 9 (5) 8 (4.4) 12 (6.7) 14 (7.7) 10 (5.5)
75 (24) 3 (1.7) 12 (6.7) 8 (4.4) 7 (4) 11 (6) 13 (7.2) 10 (5.5)
80 (24) 2 (1) 11 (6) 7 (4) 7 (4) 11 (6) 12 (6.7) 10 (5.5)
85 (29) 2 (1) 11 (6) 6 (3.3) 6 (3.3) 10 (5.5) 11 (6) 9 (5)
90 (35) 2 (1) 9 (5) 5 (2.7) 5 (2.7) 9 (5) 10 (5.5) 9 (5)
95 (35) 2 (1) 9 (5) 4 (2.2) 4 (2.2) 8 (4.4) 9 (5) 8 (4.4)
100 (41) 1 (0.5) 7 (4) 4 (2.2) 4 (2.2) 7 (4) 9 (5) 8 (4.4)
105 (41) 1 (0.5) 6 (3.3) 3 (1.7) 3 (1.7) 7 (4) 8 (4.4) 7 (4)
110 (41) 1 (0.5) 6 (3.3) 2 (1) 2 (1) 6 (3.3) 7 (4) 7 (4)
115 (45) 1 (0.5) 5 (2.7) 2 (1) 2 (1) 5 (2.7) 6 (3.3) 6 (3.3)

Page 12
Charge Using the Approach Method, TXV Sys-
temsOutdoor Temperature > 65ºF (18ºC)
The following procedure is intended as a general guide and is
for use on expansion valve systems only. For best results,
outdoor temperature should be 70°F (21°C) to 80°F (26°C).
Monitor system pressures while charging.
1 − Record outdoor ambient temperature using a digital ther-
mometer.
2 − Attach high pressure gauge set and operate unit for sev-
eral minutes to allow system pressures to stabilize.
3 − Use the same digital thermometer you used to check the
outdoor ambient temperature to check the liquid line
temperature.
4 − The difference between the ambient and liquid tempera-
tures should match values given in table 2. If the values
don’t agree with the those in table 2, add refrigerant to
lower the approach temperature, or recover refrigerant
from the system to increase the approach temperature.
TABLE 6
XC13 Normal Operating Pressures (Liquid +10 & Suction +5 psig)
Model −018 −024 −030 −036 −042 −048 −060
The values below are typical pressures; indoor evaporator match up, indoor air quantity, and evaporator load will cause the
pressures to vary. Liquid Line Pressure / Vapor Line Pressure
*°F (°C) Fixed Orifice
65 (18) 238 / 130 249 / 126 239 / 124 251 / 129 240 / 120 249 / 123 243 / 117
70 (21) 253 / 130 269 / 130 257 / 127 271 / 132 260 / 124 267 / 126 264 / 120
75 (24) 273 / 134 288 / 133 277 / 129 291 / 135 280 / 128 286 / 129 285 / 123
80 (26) 295 / 138 310 / 136 298 / 132 312 / 137 301 / 131 306 / 131 306 / 126
85 (29) 316 / 141 331 / 138 320 / 135 334 / 139 323 / 133 328 / 133 329 / 129
90 (32) 339 / 144 352 / 141 342 / 138 358 / 142 344 / 135 349 / 135 352 / 131
95 (35) 363 / 147 379 / 143 365 / 140 383 / 143 368 / 137 372 / 137 376 / 134
100 (38) 386 / 149 400 / 144 390 / 142 408 / 145 390 / 139 396 / 139 402 / 136
105 (41) 411 / 151 425 / 147 414 / 143 435 / 147 417 / 141 419 / 141 427 / 137
110 (43) 437 / 153 453 / 148 440 / 145 460 / 148 440 / 142 446 / 143 456 / 139
115 (46) 467 / 155 481 / 150 468 / 147 490 / 150 468 / 144 475 / 145 485 / 141
Expansion Valve
65 (18) 237 / 135 244 / 136 243 / 131 238 / 133 231 / 129 247 / 130 250 / 125
70 (21) 255 / 136 263 / 137 262 / 131 256 / 134 250 / 130 264 / 132 270 / 126
75 (24) 275 / 137 283 / 138 281 / 132 278 / 135 269 / 131 281 / 134 291 / 127
80 (26) 295 / 138 306 / 140 303 / 133 300 / 136 291 / 133 307 / 136 312 / 129
85 (29) 317 / 139 326 / 141 325 / 134 324 / 137 314 / 134 325 / 137 334 / 130
90 (32) 339 / 140 351 / 141 348 / 135 348 / 138 336 / 135 353 / 138 358 / 132
95 (35) 363 / 142 376 / 142 372 / 136 374 / 139 362 / 135 386 / 139 383 / 133
100 (38) 387 / 143 400 / 143 397 / 137 400 / 140 383 / 137 403 / 140 408 / 134
105 (41) 413 / 144 428 / 144 422 / 139 429 / 142 409 / 139 428 / 141 434 / 136
110 (43) 440 / 145 456 / 145 449 / 140 458 / 143 435 / 140 457 / 142 461 / 137
115 (46) 471 / 147 486 / 146 478 / 141 500 / 144 463 / 142 485 / 144 489 / 139
*Temperature of the air entering the outside coil.

Page 13
V − SERVICE AND RECOVERY
WARNING
Polyol ester (POE) oils used with R−410A refrigerant
absorb moisture very quickly. It is very important
that the refrigerant system be kept closed as much
as possible. DO NOT remove line set caps or service
valve stub caps until you are ready to make connec-
tions.
IMPORTANT
USE RECOVERY MACHINE RATED FOR R−410A
REFRIGERANT.
If the XC13 system must be opened for any kind of service,
such as compressor or drier replacement, you must take ex-
tra precautions to prevent moisture from entering the sys-
tem. The following steps will help to minimize the amount of
moisture that enters the system during recovery of R−410A.
1 − Use a regulator−equipped nitrogen cylinder to break the
system vacuum. Do not exceed 5 psi. The dry nitrogen
will fill the system, purging any moisture.
2 − Remove the faulty component and quickly seal the sys-
tem (using tape or some other means) to prevent addi-
tional moisture from entering the system.
3 − Do not remove the tape until you are ready to install new
component. Quickly install the replacement compo-
nent.
4 − Evacuate the system to remove any moisture and other
non−condensables.
Any time the XC13 sealed system is opened, the drier
must be replaced and the system must be evacuated.
Any moisture not absorbed by the polyol ester oil can be re-
moved by evacuation. Moisture that has been absorbed by
the compressor oil can be removed by replacing the drier.
IMPORTANT
Evacuation of system only will not remove moisture
from oil. Drier must be replaced to eliminate mois-
ture from POE oil.
VI − MAINTENANCE
WARNING
Electric shock hazard. Can cause inju-
ry or death. Before attempting to per-
form any service or maintenance, turn
the electrical power to unit OFF at dis-
connect switch(es). Unit may have
multiple power supplies.
At the beginning of each cooling season, the system should
be serviced. In addition, the system should be cleaned as
follows:
A − Outdoor Unit
1 − Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Ensure the power is turned
off before you clean the coil.
2 − Condenser fan motor is prelubricated and sealed. No
further lubrication is needed.
3 − Visually inspect connecting lines and coils for evidence
of oil leaks.
4 − Check wiring for loose connections.
5 − Check for correct voltage at unit (unit operating).
6 − Check amp−draw condenser fan motor.
Unit nameplate _________ Actual ____________ .
NOTE − If owner complains of insufficient cooling, the unit
should be gauged and refrigerant charge checked. Refer to
section on refrigerant charging in this instruction.
B − Indoor Coil
1 − Clean coil, if necessary.
2 − Check connecting lines and coils for evidence of oil
leaks.
3 − Check the condensate line and clean it if necessary.
C − Indoor Unit
1 − Clean or change filters.
2 − Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
3 − Belt Drive Blowers − Check belt for wear and proper ten-
sion.
4 − Check all wiring for loose connections
5 − Check for correct voltage at unit (blower operating).
6 − Check amp−draw on blower motor
Unit nameplate_________ Actual ____________.

Page 14
VII − WIRING DIAGRAMS AND SEQUENCE OF OPERATION
XC13
NOTE− The thermostat used may be electromechanical or electronic.
NOTE− Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls.
COOLING:
1− Cooling demand initiates at Y1 in the thermostat.
5 − − 24VAC from indoor unit (Y1) energizes the TOC timed off control (if used) , which energizes contactor K1.
6 − − K1-1 N.O. closes, energizing compressor (B1) and outdoor fan motor (B4).
4 − Compressor (B1) and outdoor fan motor (B4) begin immediate operation..
END OF COOLING DEMAND:
5− Cooling demand is satisfied. Terminal Y1 is de-energized.
6− Compressor contactor K1 is de-energized.
7− K1-1 opens and compressor (B1) and outdoor fan motor (B4) are de-energized and stop immediately.