Page 1
INSTALLATION
2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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.
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working near these areas during
installation or while servicing this equipment.
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.
This unit must be matched with an indoor coil as
specified in Lennox XC14 Engineering Handbook.
Coils previously charged with HCFC−22 must be
flushed.
IMPORTANT
INSTRUCTIONS
Elite® Series XC14 Units
AIR CONDITIONER
505,367M
04/08
Supersedes 01/08
Table of Contents
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
XC14 Air Conditioner Units 1. . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovering Refrigerant from Existing System 5. . . . .
Removing Existing Outdoor Unit 6. . . . . . . . . . . . . . . . .
Positioning New Outdoor Unit 6. . . . . . . . . . . . . . . . . . .
Removing and Installing Panels 8. . . . . . . . . . . . . . . . .
New or Replacement Line Set 9. . . . . . . . . . . . . . . . . . .
Brazing Connections 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Indoor Unit Metering Device 11. . . . . . . . . . .
Flushing System 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing New Indoor Unit Metering Device 13. . . . . . . .
Testing for Leaks 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 16. . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Outdoor Unit Delivered Void of Charge 17. . .
Electrical Connection 17. . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Charging Procedures 18. . . . . . . . . . . . . . .
System Operation 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Homeowner Information 23. . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 24. . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 24. . . . . . . . . . . . .
Shipping and Packing List
Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.
1 Assembled outdoor unit.
1 Refrigerant flow control kit (Fixed Orifice)
XC14 Air Conditioner Units
The XC14 Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HFC−410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
XC14 Engineering Handbook.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
Thermal expansion valve (TXV)
Fixed orifice
Litho U.S.A.
04/08 505,367M
*2P0408* *P505367M*
Page 1
Page 2
Unit Dimensions − Inches (mm)
RUN
CAPACITOR
CONTACTOR
OUTDOOR FAN
COMPRESSOR
(SOUND
REDUCTION
HOUSING NOT
SHOWN)
HIGH
PRESSURE
SWITCH
UNIT SUPPORT
FEET
TOP VIEW
C
DISCHARGE AIR
SIDE VIEW
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
LIQUID LINE
CONNECTION
ELECTRICAL INLETS
SUCTION LINE
CONNECTION
4.25"
(108mm)
(121mm)
4.75"
UNIT SUPPORT
FEET
DISCHARGE
LINE
FILTER
DRIER/
LIQUID LINE
CONNECTIONS
PARTS ARRANGEMENT
A
2"
(51mm)
1"
(25mm)
B
SIDE VIEW
SUCTION LINE
SUCTION
VALVE AND
GAUGE
PORT/SUCTION
LINE
CONNECTIONS
8.50"
(216mm)
8.75"
(222mm)
5.50"
(140mm)
13.50"
(343mm)
XC14−018 AND −024 BASE SECTIONS
9.25"
(241mm)
8.25"
(210mm)
D
E
F
G
XC14−030 TO −060 BASE WITH
K
J
H
ELONGATED LEGS
Model
018
024
030
036
042
048 39 (991) 30.50 (775) 35 (889)
060 35 (889) 35.50 (902) 39.50 (1003) 16.875 (429) 8.75 (222) 3.125 (79) 30.75 (781) 4.625 (117) 3.75 (95) 26.875 (683)
A B C D E F G H J K
31 (787) 27 (686) 28 (711)
31 (787) 30.50 (775) 35 (889)
XC14 Dimensions − in. (mm)
13.875 (352) 7.75 (197) 3.25 (83) 27.125 (689) 3.625 (92) 4.50 (114) 20.625 (524)
Page 2
505367M 04/08
Page 3
WARNING
This product and/or the indoor unit it is matched
with may contain fiberglass wool.
Disturbing the insulation during installation, maintenance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
General Information
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
IMPORTANT
Only use Allen 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 an Allen wrench rated at less than
50Rc risks rounding or breaking off the wrench, or
stripping the valve stem recess.
1/6 TURN
12
11
10
9
8
7
1
2
3
4
5
6
11
10
9
8
Figure 1. Cap Tightening Distances
NOTE − A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque.
1/12 TURN
12
1
2
3
4
7
5
6
When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 1
lists torque values for typical service and repair items.
Table 1. Torque Requirements
Part 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
USING MANIFOLD GAUGE SETS
When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
See figure 3 for a typical manifold gauge connection setup.
Manifold gauge sets used with HFC−410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 − 800 on the high side and a low side of
30" vacuum to 250 psi with dampened speed to 500 psi.
Gauge hoses must be rated for use at up to 800 psi of
pressure with a 4000 psi burst rating.
OPERATING SERVICE VALVES
The liquid and suction line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each service valve is equipped with a service port which
has a factory−installed valve stem.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
Operating Angle−Type Service Valve
To Access Angle−Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
SERVICE PORT CAP
STEM CAP
SERVICE PORT
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
SERVICE PORT
CLOSED TO BOTH
INDOOR AND
OUTDOOR UNITS
FRONT-SEATED
CORE
VALVE STEM
TO INDOOR
UNIT
TO OUTDOOR UNIT
Figure 2. Angle−Type Service Valve
(Font−Seated Closed)
1. Remove service port cap with an appropriately sized
wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:
Page 3
XC14 SERIES
Page 4
OUTDOOR UNIT
(Uncased Coil Shown)
LOW
PRESSURE
GAUGE MANIFOLD
PRESSURE
TO
HFC−410A
DRUM
HIGH
FILTER
DRIER
LIQUID LINE
SERVICE VALVE
COMPRESSOR
Figure 3. Typical Manifold Gauge Connection Setup
With Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1.
To Open and Close Angle−Type Service Valve:
A valve stem cap protects the valve stem from
contamination and assures a leak−free seal.
SERVICE PORT CAP
SERVICE PORT
CORE
OPEN TO BOTH
INDOOR AND
OUTDOOR UNITS
TO INDOOR
UNIT
TO OUTDOOR UNIT
STEM CAP
SERVICE PORT
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
Figure 4. Angle−Type Service Valve
(Back−Seated Opened)
1. Remove stem cap with a wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes and 5/16" for
suction-line valve sizes) to back the stem out
counterclockwise as far as it will go.
3. Replace the stem cap and tighten as follows:
With Torque Wrench: Tighten finger tight and then
tighten per table 1.
OUTDOOR
COIL
SUCTION LINE
SERVICE VALVE
TXV
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/12 turn clockwise as illustrated in figure 1.
Operating Ball−Type Service Valve
To Access Ball−Type 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 to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1.
To Open and Close Ball−Type Service Valve:
A valve stem cap protects the valve stem from
contamination and assures a leak−free seal.
1. Remove stem cap with a wrench.
2. Use an appropriately sized wrench to open. To open
valve, rotate stem counterclockwise 90°. To close
rotate stem clockwise 90°.
3. Replace the stem cap and tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized to wrench turn an additional
1/12 turn clockwise as illustrated in figure 1.
505367M 04/08
Page 4
Page 5
OPEN TO LINE SET WHEN VALVE IS CLOSED,
TO BOTH LINE SET AND UNIT WHEN VALVE IS
OPEN.
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT CAP
TO OUTDOOR UNIT
TO INDOOR UNIT
BALL (SHOWN
CLOSED)
STEM CAP
VALV E
STEM
Figure 5. Ball−Type Service Valve
Recovering Refrigerant from Existing
HCFC−22 System
Remove existing HCFC−22 refrigerant using one of the
following methods:
METHOD 1:
Use this method if the existing outdoor unit is not equipped
with manual shut−off valves, and plan on using existing
HCFC−22 refrigerant to flush the system.
NOTE − Use recovery machine instructions for specific
setup requirements.
Perform the following task:
1. Disconnect all power to the existing outdoor unit.
2. Connect to the existing unit a gauge set, clean
recovery cylinder and a recovery machine. Use the
instructions provided with the recover machine on how
to setup the connections.
3. Remove all HCFC−22 refrigerant from the existing
system. Check gauges after shutdown to confirm that
the entire system is completely void of refrigerant.
RECOVERY MACHINE
MANIFOLD GAUGES
METHOD 2:
Use this method if the existing outdoor unit is equipped
with manual shut−off valves, and plan on using new
HCFC−22 refrigerant to flush the system.
IMPORTANT: Some system configurations may contain
higher than normal refrigerant charge due to either large
internal coil volumes, and/or long line sets. The following
conditions may cause the compressor to stop functioning:
The following devices could prevent full system charge
recovery into the outdoor unit:
Outdoor unit’s high or low−pressure switches (if
applicable) when tripped can cycled the compressor
OFF.
Compressor can stop pumping due to tripped internal
pressure relief valve.
Compressor has internal vacuum protection that is
designed to unload the scrolls (compressor stops
pumping) when the pressure ratio meets a certain
value or when the suction pressure is as high as 20
psig. (Compressor suction pressures should never be
allowed to go into a vacuum. Prolonged operation at
low suction pressures will result in overheating of the
scrolls and permanent damage to the scroll tips, drive
bearings and internal seals).
Once the compressor can not pump down to a lower
pressure due to one of the above system conditions, shut
off the suction valve. Turn OFF the main power to unit and
use a recovery machine to recover any refrigerant left in
the indoor coil and line set.
Perform the following task:
1. Start the existing HCFC−22 system in the cooling
mode and close the liquid line valve.
2. Pump as much of the existing HCFC−22 refrigerant
with the compressor back into the outdoor unit until
you have reached the limitations of the outdoor
system. Turn the outdoor unit main power OFF and
use a recovery machine to remove the remaining
refrigerant in the system.
NOTE − It may be necessary to bypass the low pressure
switches if equipped to ensure complete refrigerant
evacuation.
3. When the low side system pressures reach 0 psig,
close the suction line valve.
4. Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into the
low side of the system.
CLEAN RECOVERY
CYLINDER
Figure 6. Typical Refrigerant Recovery (Method 1)
OUTDOOR UNIT
Removing Existing Outdoor Unit
Perform the following task at the existing outdoor unit:
Disconnect line set at the service valves.
Disconnect electrical service at the disconnect switch.
Remove old outdoor unit.
Page 5
XC14 SERIES
Page 6
Positioning New Outdoor Unit
See Unit Dimensions on page 2 for sizing mounting slab,
platforms or supports. Refer to figure 7 for mandatory
installation clearance requirements.
*
INSTALL UNIT
AWAY FROM WIN-
DOWS
*
* SEE NOTES BELOW THIS FIGURE FOR FURTHER DETAILS.
*
*
Figure 7. Installation Clearances
NOTES:
Service clearance of 30 in. (762 mm) 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. (914 mm)
.
Clearance to one of the remaining two sides may be
12 in. (305 mm) and the final side may be 6 in. (152
.
mm)
48 in. (1219 mm) clearance required on top of unit.
A clearance of 24 in. (610 mm) must be maintained
between two units.
POSITIONING CONSIDERATIONS
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Consider the following when positioning the unit:
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 8.
TWO 90° ELBOWS
INSTALLED IN LINE SET
WILL REDUCE LINE SET
VIBRATION.
Figure 8. Outside Unit Placement
PLACING OUTDOOR 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 9.
NOTE − If necessary for stability, anchor unit to slab as
described in Stabilizing Unit on Uneven Surfaces on page
7.
INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE
OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY FROM
BUILDING STRUCTURE.
BUILDING
STRUCTURE
MOUNTING
SLAB
GROUND LEVEL
Figure 9. Slab Mounting at Ground Level
ELEVATING THE UNIT (SMALL−BASE UNITS)
If additional elevation is necessary, raise the unit by
extending the length of the unit support feet. This may be
done by cutting four equal true−cut lengths of Schedule
(SCH) 40, 4" (101.6mm) piping to the height required as
illustrated in figure 10.
505367M 04/08
Page 6
Page 7
BASE
BASE
LEG DETAIL
4" (101.6MM)
SCH 40 PIPING
Figure 10. Elevated Slab Mounting using Feet
Extenders (Small Base Units)
NOTE − Keep the height of extenders short enough to
ensure a sturdy installation. If it is necessary to extend
further, consider a different type of field−fabricated
framework that is sturdy enough for greater heights.
The inside diameter of the 4" (101.6mm) piping is
approximately 0.25" (6.35mm) greater than the
pre−installed feet on the unit. Devise a shim that will take up
the space and hold the extenders onto the feet during this
procedure. Small strips of 0.125" (3.175mm) thick
adhesive foam may be used. One or two small 1"
(25.4mm) square strips should be adequate to hold the
extender in place.
ELEVATING THE UNIT (LARGER−BASE UNITS)
Unlike the small−base units which use round support feet,
the larger−base units are outfitted with elongated support
feet as illustrated in figure 11 which uses a similar method
for elevating the unit.
If additional elevation is necessary, raise the unit by
extending the length of the unit support feet. This may be
achieved by using a 2" SCH 40 female threaded adapter.
The specified coupling will fit snuggly into the recessed
portion of the feet. Use additional 2" SCH 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
ensure a sturdy installation. If it is necessary to extend
further, consider a different type of field−fabricated
framework that is sturdy enough for greater heights.
LEG DETAIL
2" (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
Figure 11. Elevated Slab Mounting using Feet
Extenders (Larger Base Units)
STABILIZING UNIT ON UNEVEN SURFACES
To help stabilize an outdoor unit, some installations may
require strapping the unit to the pad using brackets and
anchors commonly available in the marketplace.
With unit positioned at installation site, remove two side
louvered panels to expose the unit base pan. Install the
brackets as illustrated in figure 12 using conventional
practices; replace the panels after installation is complete.
Slab Side Mounting
#10 1/2" LONG SELF−
DRILLING SHEET
METAL SCREWS
STABILIZING
BRACKET (18 GAUGE
METAL − 2" WIDTH;
HEIGHT AS REQ’D)
#10 1−1/4" LONG
HEX HD SCREW
AND FLATWASHER
CONCRETE SLAB − USE PLASTIC
PLASTIC ANCHOR (HOLE DRILL
1/4")PLASTIC SLAB − NO PLASTIC
ANCHOR (HOLE DRILL 1/8")
COIL
BASE PAN
CORNER POST
Deck Top Mounting
STABILIZING BRACKET (18
GAUGE METAL − 2" WIDTH;
HEIGHT AS REQ’D); BEND
TO FORM RIGHT ANGLE
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, 2
BRACKETS PER SIDE, 2" FROM EACH CORNER.
MINIMUM 1
PER SIDE
FOR EXTRA
STABILITY
Figure 12. Installing Stabilizer Brackets
Page 7
XC14 SERIES
Page 8
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.
ROOF MOUNTING
Install unit at a minimum of four inches above the surface
of the roof. Care must be taken to ensure weight of unit is
properly distributed over roof joists and rafters. Either
redwood, steel supports, or roofed in equipment platform is
recommended.
Removing and Installing Panels
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.
4. Holding the panel’s hinged side firmly in place, close
the right−hand side of the panel, aligning the screw
holes.
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.
SCREW
LIP
DETAIL A
DETAIL B
HOLES
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE
PANEL
Detail C
Figure 13. Removing/Installing Louvered Panels
(Details A, B and C)
REMOVING PANELS
Remove the louvered panels as follows:
1. Remove two screws, allowing the panel to swing open
slightly as illustrated in figure 13.
NOTE − Hold the panel firmly throughout this procedure
2. Rotate bottom corner of panel away from hinge corner
post until lower three tabs clear the slots as illustrated
in figure 13, detail B.
3. Move panel down until lip of upper tab clears the top
slot in corner post as illustrated in figure 13, detail A.
INSTALLING PANEL
Install the louvered panels as follows:
1. Position the panel almost parallel with the unit as
illustrated in figure 14, detail D with the screw side as
close to the unit as possible.
2. With a continuous motion slightly rotate and guide the
lip of top tab inward as illustrated in figure 13, details
A and C, then upward into the top slot of the hinge
corner post.
3. Rotate panel to vertical to fully engage all tabs.
Maintain minimum panel angle (as close to parallel with the unit
as possible) while installing panel.
ANGLE MAY BE TOO
EXTREME
PREFERRED ANGLE
FOR INSTALLATION
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
Figure 14. Removing/Installing Louvered Panels
(Detail D)
5. When panel is correctly positioned and aligned, insert
the screws and tighten.
505367M 04/08
Page 8
Page 9
New or Replacement Line Set
This section provides information on installation or
replacement of existing line set. If line set are not being
installed then proceed to Brazing Connections on page 11.
If refrigerant lines are routed through a wall, seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. Also, consider the following when
placing and installing a high−efficiency air conditioner.
REFRIGERANT LINE SET
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or sweat connections). Use Lennox L15 (sweat,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in table 2.
Table 2. Refrigerant Line Set
Field Connections Recommended Line Set
Model
−018
−024
−030
−036
−042
−048
−060
Liquid
Line
3/8".
(10 mm)
3/8".
(10 mm)
3/8".
(10 mm)
Suction
Line
3/4"
(19 mm)
7/8"
(22 mm)
1−1/8".
(29 mm)
Liquid
Line
3/8"
(10 mm)
3/8"
(10 mm)
3/8"
(10 mm)
Suction
Line
3/4"
(19 mm)
7/8"
(22 mm)
1−1/8"
(29 mm)
L15 Line Set
L15−41
15 ft. − 50 ft.
(4.6 m − 15 m)
L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)
Field
Fabricated
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
The RFC1−metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.
If the XC14 is being used with either a new or existing
indoor coil which is equipped with a liquid line which served
as a metering device (RFCI), the liquid line must be
replaced prior to the installation of the XC14 unit. Typically
a liquid line used to meter flow is 1/4" in diameter and
copper.
INSTALLING LINE SET
Line Set IsolationThis reference illustrates
procedures, which ensure proper refrigerant line set
isolation:
Installation of line set on horizontal runs is
illustrated in figure 15.
Installation of a transition from horizontal to
vertical is illustrated in figure 17.
Installation of line set on vertical runs is illustrated in
figure 16.
TO HANG LINE SET FROM JOIST OR
RAFTER, USE EITHER METAL STRAPPING
MATERIAL OR ANCHORED HEAVY NYLON
WIRE TIES.
STRAPPING MATERIAL
(AROUND SUCTION
LINE ONLY)
8 FEET
FLOOR JOIST OR
ROOF RAFTER
WIRE TIE (AROUND
SUCTION LINE ONLY)
8 FEET
TAPE OR
WIRE TIE
NOTE − When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, or contact Lennox Technical
Support Product Applications for assistance. To obtain the
correct information from Lennox, be sure to communicate
the following points:
Model (XC14) and size of unit (e.g. −060).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows and if there is a rise or drop of the
piping.
Page 9
TAPE OR
WIRE TIE
FLOOR JOIST OR
ROOF RAFTER
METAL
SLEEVE
STRAP THE SUCTION LINE TO
THE JOIST OR RAFTER AT 8 FEET
INTERVALS THEN STRAP THE
LIQUID LINE TO THE SUCTION
LINE.
Figure 15. Refrigerant Line Set: Installing
Horizontal Runs
XC14 SERIES
Page 10
IMPORTANT - REFRIGERANT LINES
OUTSIDE WALL
WOOD BLOCK
BETWEEN STUDS
NOTE − SIMILAR INSTALLATION
PRACTICES SHOULD BE USED
IF LINE SET IS TO BE INSTALLED
ON EXTERIOR OF OUTSIDE
WALL.
MUST NOT CONTACT WALL.
SUCTION LINE
LIQUID LINE
WIRE TIE
INSIDE WALL
STRAP
SLEEVE
WIRE TIE
AUTOMOTIVE MUFFLER-TYPE
HANGER
STRAP LIQUID LINE
TO SUCTION LINE
WOOD BLOCK
WIRE TIE
STRAP
SLEEVE
SUCTION LINE WRAPPED
WITH ARMAFLEX
LIQUID LINE
OUTSIDE
PVC
PIPE
WALL
FIBERGLASS
INSULATION
CAULK
IMPORTANT!
REFRIGERANT LINES
MUST NOT CONTACT
STRUCTURE.
Figure 16. Refrigerant Line Set: Installing Vertical
Runs (New Construction Shown)
1
2
METAL SLEEVE
ANCHORED HEAVY
NYLON WIRE TIE
WALL
STUD
METAL SLEEVE
SUCTION LINE −
WRAPPED IN ARMAFLEX
SUCTION LINE − WRAPPED
IN ARMAFLEX
LIQUID LINE
STRAP LIQUID LINE
TO SUCTION LINE
LIQUID LINE
Figure 17. Refrigerant Line Set: Transition from
Vertical to Horizontal
3
CUT AND DEBUR
INDOOR UNIT
7
INSTALL CORE ONLY FOR
BOTH SERVICE PORTS AFTER
THEY HAVE COOLED.
505367M 04/08
6
BRAZE LINE SET
REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS
SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN
SUCTION LINE
LIQUID LINE
GAUGES
SERVICE
5
Figure 18. Brazing Connections
Page 10
ATTACH
SERVICE
VALVE
VALVE
OUTDOOR
UNIT
FLOW NITROGEN
NITROGEN
4
WRAP
SERVICE
VALV E
Page 11
Brazing Connections
Use the following procedure to braze the line set to the new
air conditioner unit. Figure 18 on page 10 is provided as a
general guide for preparing to braze the line set to the air
conditioner unit.
WARNING
Polyol ester (POE) oils used with HFC−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 connections.
5. Flow regulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the valve stem port
connection on the liquid line service valve and out of
the valve stem port connection on the suction service
valve.
NOTE − The fixed orifice or TXV metering device at the
indoor unit will allow low pressure nitrogen to flow through
the system.)
NOTE − Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper−to−copper brazing or 45
percent silver alloy for copper−to−brass or copper−to−steel
brazing.
6. Braze the liquid line to the liquid line service valve.
Turn off nitrogen flow.
WARNING
Danger of fire. Bleeding the
refrigerant charge from only the high
side may result in the low side shell
and suction tubing being
pressurized. Application of a brazing
torch while pressurized may result in
ignition of the refrigerant and oil
mixture − check the high and low
pressures before unbrazing.
WARNING
When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration or air conditioning
system, use a regulator that can
control the pressure down to 1 or 2
psig (6.9 to 13.8 kPa).
1. Cut ends of the refrigerant lines square (free from
nicks or dents). Debur the ends. The pipe must remain
round, do not pinch end of the line.
2. Remove service cap and core from both the suction
and liquid line service ports.
3. Connect gauge low pressure side to liquid line service
valve.
4. To protect components during brazing, wrap a wet
cloth around the liquid line service valve body and
copper tube stub and use another wet cloth
underneath the valve body to protect the base paint.
Also, shield the light maroon R−410A sticker.
IMPORTANT
Repeat procedure starting at paragraph 4 for brazing the
suction line to service port valve.
7. After all connections have been brazed, disconnect
manifold gauge set from service ports, cool down
piping with wet rag and remove all wrappings. Do not
reinstall cores until after evacuation procedure.
Reinstall service caps if desired to close off refrigerant
ports.
Removing Indoor Unit Metering Device
Remove the existing HCFC−22 fixed orifice or TXV from
the indoor coil. The existing indoor unit HCFC−22 metering
device is not approved for use with HFC−410A refrigerant
and may prevent proper flushing.
REPLACEMENT PARTS
If replacement parts are necessary for the indoor unit,
order kit 69J46 (LB−95325A). The kit includes:
LIQUID LINE ORIFICE HOUSINGS (10)
TEFLON RINGS (20)
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10)
BRASS NUTS (10)
Figure 19. 69J46 Kit Components
LIQUID LINE
ASSEMBLY
PISTON
RETAINER
STRAINER
COPPER
TUBE
Page 11
XC14 SERIES
Page 12
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
ASSEMBLY
VALVE STEM
TEFLON RING
FIXED
ORIFICE
VALVE STEM CAP
REMOVE AND DISCARD
VALVE STEM ASSEMBLY
(IF PRESENT)
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
(Uncased Coil Shown)
Figure 20. Typical Fixed Orifice Removal
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps holding the liquid line
and distributor assembly.
3. Using two wrenches, disconnect liquid line from liquid
line orifice housing. Take care not to twist or damage
distributor tubes during this process.
4. Remove and discard fixed orifice, valve stem
assembly if present and Teflon ring as illustrated in
figure 20.
5. Use a field−provided fitting to temporary reconnect the
liquid line to the indoor unit’s liquid line orifice housing.
TYPICAL TXV REMOVAL PROCEDURE
(Uncased Coil Shown)
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
LIQUID LINE
ORIFICE
HOUSING
STUB END
TEFLON
RING
TXV
TEFLON
RING
SENSING
LINE
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps holding the liquid line
and distributor assembly.
3. Disconnect the equalizer line from the TXV equalizer
line fitting on the suction line.
4. Remove the suction line sensing bulb as illustrated in
figure 21.
5. Disconnect the liquid line from the TXV at the liquid line
assembly.
6. Disconnect the TXV from the liquid line orifice housing.
Take care not to twist or damage distributor tubes
during this process.
7. Remove and discard TXV and the two Teflon rings as
illustrated in figure 21.
8. Use a field−provided fitting to temporary reconnect the
liquid line to the indoor unit’s liquid line orifice housing.
Flushing the System
IMPORTANT
The line set and indoor unit coil must be flushed
with at least the same amount of clean refrigerant
that previously charged the system. Check the
charge in the flushing cylinder before proceeding.
IMPORTANT
If this unit is being matched with an approved line
set or indoor unit coil which 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. It can also clog
the expansion device, and reduce the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
SENSING
BULB
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
Figure 21. Typical TXV Removal
505367M 04/08
LIQUID
LINE
IMPORTANT
The Environmental Protection Agency (EPA)
prohibits the intentional venting of HFC refrigerants
during maintenance, service, repair and disposal of
appliance. Approved methods of recovery,
recycling or reclaiming must be followed.
If the original system used:
HCFC−22 refrigerant, then flush the system using the
procedure provided in this section.
HFC−410A refrigerant, then proceed to Installing New
Refrigerant Metering Device.
Page 12
Page 13
INVERTED HCFC−22 CYLINDER
CONTAINS CLEAN HCFC−22 TO
BE USED FOR FLUSHING.
SUCTION LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE VALVE
RECOVERY
CYLINDER
SUCTION
LIQUID
NOTE − The inverted HCFC−22 cylinder must contain at least the same
amount of refrigerant as was recovered from the existing system.
NEW
OUTDOOR
UNIT
OPENED
RECOVERY MACHINE
GAUGE
MANIFOLD
LOW
PRESSURE
TANK
RETURN
INLET
DISCHARGE
HIGH
PRESSURE
CLOSED
Figure 22. Typical Flushing Connection
6. Use dry nitrogen to break the vacuum on the
refrigerant lines and indoor unit coil before removing
the recovery machine, gauges and refrigerant drum.
Installing New Indoor Unit Metering
Device
XC14 units can be configured for use in with HFC−410A
fixed orifice or TXV metering devices. This section
provides instructions on installing either a fixed orifice or
TXV refrigerant metering device.
9
10
8
11
1/8 TURN
10
8
11
12
7
6
12
1
2
3
9
4
7
5
6
1/2 TURN
1
2
3
4
5
CAUTION
This procedure should not be performed on
systems which contain contaminants (Example:
compressor burn out).
REQUIRED EQUIPMENT
Equipment required to flush the existing line set and indoor
unit coil:
Two clean HCFC−22 recovery bottles,
Oilless recovery machine with pump-down feature,
Two gauge sets (one for HCFC−22; one for
HFC−410A).
PROCEDURE
1. Connect the following:
HCFC−22 cylinder with clean refrigerant to the
suction service valve,
HCFC−22 gauge set to the liquid line valve,
Recovery machine with an empty recovery tank to
the gauge set.
2. Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the
existing system line set and indoor unit coil.
3. Invert the cylinder of clean HCFC−22 and open its
valve to allow liquid refrigerant to flow into the system
through the suction line valve. Allow the refrigerant to
pass from the cylinder and through the line set and the
indoor unit coil before it enters the recovery machine.
4. After all of the liquid refrigerant has been recovered,
switch the recovery machine to suction recovery so
that all of the HCFC−22 suction is recovered. Allow the
recovery machine to pull a vacuum on the system.
5. Close the valve on the inverted HCFC−22 drum and
the gauge set valves. Pump the remaining refrigerant
out of the recovery machine and turn the machine off.
Figure 23. Tightening Distance
TYPICAL FIXED ORIFICE INSTALLATION
PROCEDURE
1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit’s liquid
line orifice housing.
2. Ensure that the fixed orifice supplied with the outdoor
unit is installed with the nylon seat pointing toward the
distributor assembly.
3. Apply a small amount of refrigerant oil on the Teflon
ring and insert the Teflon ring securely into the orifice
housing.
4. Attached the liquid line assembly to the liquid line
orifice housing. Finger tighten and use an appropriately
sized wrench to turn an additional 1/2 turn clockwise
as illustrated in figure 23, or 20 ft−lb.
5. Place the supplied fixed orifice sticker on the indoor
cabinet after installation.
LIQUID LINE
ORIFICE HOUSING
FIXED
(Uncased
Coil Shown)
ORIFICE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
TEFLON
RING
LIQUID
LINE
Figure 24. Typical Fixed Orifice Installation
Table 3 lists both the Lennox catalog and part numbers for
the fixed orifice kit provided with each unit model. In
non−standard applications, the provided fixed orifice kit
may not be appropriate. Figure 25 illustrates the kit
components and quantities.
Page 13
XC14 SERIES
Page 14
Table 3. Indoor Unit Fixed Orifice Kits
Model Catalog Number Part Number Drill Size
XC14−018 97M74 100484−06 0.053
XC14−024 97M75 100484−08 0.057
XC14−030 97M76 100484−13 0.063
XC14−036 11W02 100484−22 0.073
XC14−042 97M78 100484−24 0.076
XC14−048 11W07 100484−31 0.083
XC14−060 11W11 100484−40 0.093
Use the Lennox catalog number to order a new or replacement fixed
orifice kit.
The fixed orifice kit includes the following components:
FIXED ORIFICE (1)
FIXED ORIFICE
EXTRACTOR (1)
TEFLON RING (1)
FIXED ORIFICE STICKER (1)
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE FIGURE 28
FOR FURTHER DETAILS)
SENSING BULB INSULATION IS
REQUIRED IF MOUNTED EXTERNAL
TO THE COIL CASING. SEE FIGURE 27
FOR BULB POSITIONING.
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
EQUALIZER
LINE
STUB END
TXV
TEFLON
RING
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
TEFLON
RING
SENSING
LINE
LIQUID
LINE
Figure 25. Fixed Orifice Kit Components
TYPICAL TXV INSTALLATION PROCEDURE
The TXV unit can be installed internal or external to the
indoor coil. In applications where an uncased coil is being
installed in a field−provided plenum, install the TXV in a
manner that will provide access for field servicing of the
TXV. Refer to Figure 26 for reference during installation of
TXV unit.
To prevent any possibility of water damage, properly
insulate all parts of the TXV assembly that may sweat due
to temperature differences between the valve and its
surrounding ambient temperatures.
Figure 26. Typical TXV Installation
1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit’s
distributor assembly.
2. Install one of the provided Teflon rings around the
stubbed end of the TXV and lightly lubricate the
connector threads and expose surface of the Teflon
ring with refrigerant oil.
3. Attach the stubbed end of the TXV to the liquid line
orifice housing. Finger tighten and use an appropriately
sized wrench to turn an additional 1/2 turn clockwise
as illustrated in figure 23, or 20 ft−lb.
4. Place the remaining Teflon ring around the other end
of the TXV. Lightly lubricate connector threads and
expose surface of the Teflon ring with refrigerant oil.
5. Attach the liquid line assembly to the TXV. Finger
tighten and use an appropriately sized wrench to turn
an additional 1/2 turn clockwise as illustrated in figure
23, or 20 ft−lb.
505367M 04/08
Page 14
Page 15
6. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 27 using the clamp
and screws provided.
NOTE − Insulating the sensing bulb once installed may be
required when the bulb location is external to the coil
casing.
SUCTION LINE
ON LINES SMALLER THAN
7/8", MOUNT SENSING BULB
AT EITHER THE 3 OR 9
O’CLOCK POSITION.
Table 4. Indoor Unit TXV Kits
Model Catalog Number Part Number
−018, 024, 030 and 036 37L51 37L5101
−042 39L72 39L7201
−048 and 060 91M02 100188−02
Use the Lennox catalog number to order a TXV kit.
The indoor unit TXV kit includes the following components:
BULB
SUCTION LINE
BULB
NOTE − Never mount on bottom of line.
12
12
BULB
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O’CLOCK
POSITION. NEVER MOUNT
ON BOTTOM OF LINE.
BULB
Figure 27. TXV Sensing Bulb Installation
7. Remove and discard either the flare seal cap or flare
nut with copper flare seal bonnet from the equalizer
line port on the suction line as illustrated in figure 28.
IMPORTANT
When removing the flare nut, ensure that the copper
flare seal bonnet is removed.
TXV (1)
HEX HEAD BOLTS
AND NUTS (2)
TEFLON
RINGS (2)
COPPER
MOUNTING
STRAP (1)
Figure 29. TXV Kit Components
Testing for Leaks
After the line set has been connected to both the indoor
and outdoor units, check the line set connections and
indoor unit for leaks. Use the following procedure to test for
leaks:
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.
FLARE SEAL
CAP
OR
MALE BRASS EQUALIZER
FLARE NUT
COPPER
FLARE SEAL
BONNET
LINE FITTING
SUCTION LINE
Figure 28. Copper Flare Seal Bonnet Removal
8. Connect the equalizer line from the TXV to the
equalizer suction port on the suction line. Finger
tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated
in figure 23.
See the XC14 Engineering Handbook for approved TXV
indoor/outdoor unit match−ups and application
information. Table 4 lists both the Lennox catalog and part
numbers for the TXV kit required for each unit model.
Figure 29 illustrates the kit components and quantities.
WARNING
Refrigerant can be harmful if it is inhaled.
Refrigerant must be used and recovered
responsibly.
Failure to follow this warning may result in personal
injury or death.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause damage by fire and/
or an explosion, that could result in
personal injury or death.
1. Connect an HFC−410A manifold gauge set high
pressure hose to the suction valve service port.
Page 15
XC14 SERIES
Page 16
NOTE − Normally, the high pressure hose is connected to
the liquid line port; however, connecting it to the suction
port better protects the manifold gauge set from high
pressure damage.
2. With both manifold valves closed, connect the cylinder
of HFC−410A refrigerant to the center port of the
manifold gauge set. Open the valve on the HFC−410A
cylinder (suction only).
3. Open the high pressure side of the manifold to allow
HFC−410A into the line set and indoor unit. Weigh in
a trace amount of HFC−410A. [A trace amount is a
maximum of two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure]. Close the valve on the
HFC−410A cylinder and the valve on the high pressure
side of the manifold gauge set. Disconnect the
HFC−410A cylinder.
4. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.
5. Adjust dry nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit.
6. 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.
NOTE − Amounts of refrigerant will vary with line lengths.
7. Check all joints for leaks.
8. Purge dry nitrogen and HFC−410A mixture.
9. Correct any leaks and recheck.
10. After leak testing disconnect gauges from service
ports.
Evacuating the System
WARNING
Danger of Equipment Damage. Avoid deep
vacuum operation. Do not use compressors to
evacuate a system. Extremely low vacuums can
cause internal arcing and compressor failure.
Damage caused by deep vacuum operation will
void warranty.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
Evacuating the system of non−condensables is critical for
proper operation of the unit. Non−condensables are
defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non−condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.
NOTE − Remove cores from service valves if not already
done.
1. Connect manifold gauge set to the service valve ports
as follows:
low pressure gauge to suction 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).
NOTE − During the early stages of evacuation, it is
desirable to close the manifold gauge valve at least once to
determine if there is a rapid rise in pressure this 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 vacuum
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 dry nitrogen
cylinder with pressure regulator set to 150 psig (1034
kPa) and purge the hose. Open the manifold gauge
valves to break the vacuum in the line set and indoor
unit. Close the manifold gauge valves.
7. Shut off the dry nitrogen cylinder and remove the
manifold gauge hose from the cylinder. Open the
manifold gauge valves to release dry nitrogen from the
line set and indoor unit.
8. Reconnect the manifold gauge to vacuum pump, turn
pump on, and continue to evacuate 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 vacuum pump and
closing the manifold gauge valves.
9. When the absolute pressure requirement above has
been met, disconnect the manifold hose from the
vacuum pump and connect it to an upright cylinder of
HFC−410A refrigerant. Open the manifold gauge valve
pressure line set to break vacuum with 2 to 5 psi.
10. Perform the following:
A Close manifold gauge valves
B Shut off HFC−410A cylinder
C Reinstall service valve cores by removing
manifold hose from service valve. Quickly install
core with core tool while maintaining a positive
system pressure.
D Replace the stem caps and secure finger tight,
then tighten an additional one−sixth (1/6) of a turn
as illustrated in figure 1.
505367M 04/08
Page 16
Page 17
Servicing Outdoor Unit Delivered Void of
Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again. Then, weigh the
appropriate amount of HFC−410A refrigerant as listed
on unit nameplate into the system.
5. Monitor the system to determine the amount of
moisture remaining in the oil. 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.
Electrical Connections
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 blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
1. Install line voltage power supply to unit from a properly
sized disconnect switch. Any excess high voltage field
wiring should be trimmed or secured away from the
low voltage field wiring as illustrated in figure 30.
2. Ground unit at unit disconnect switch or to an earth
ground.
NOTE − To facilitate a conduit, a cutout is located in the
bottom of the control box. Connect conduit to the control
box using a proper conduit fitting.
NOTE − Units are approved for use only with copper
conductors.
NOTE − 24VAC, Class II circuit connections are made in
the low voltage junction box as illustrated in figure 31.
NOTE − See unit wiring diagram for power supply
connections. If indoor unit is not equipped with blower
relay. It must be field−provided and installed (P−8−3251 or
equivalent)
NOTE − For proper voltages, select thermostat wire gauge
per table 5.
Table 5. Wire Run Lengths
Wire run length AWG # Insulation type
less than 100’ (30m) 18
more than 100’ (30m) 16
WIRE TIES
CONDUIT
GROMMET
Color−coded, temperature
rating 35ºC minimum
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
Figure 30. Separating High/Low Voltage Field Wiring
THERMOSTAT INDOOR UNIT
W1
R
Y
G
C
POWER
HEAT
COOLING
INDOOR
BLOWER
COMMON
R
OUTDOOR UNIT
W
Y
G
C
(COMPRESSOR
CONTACTOR)
Y1
C
Figure 31. Typical Field Low Voltage Wiring
3. Install room thermostat (ordered separately) on an
inside wall approximately in the center of the
conditioned area and 5 feet (1.5m) from the floor. It
should not be installed on an outside wall or where it
can be affected by sunlight, drafts or vibrations.
4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated in
figure 31.
5. Do not bundle any excess 24V control wire inside
control box. Run control wire through installed wire tie
and tighten wire tie to provide low voltage strain relief
and to maintain separation of field installed low and
high voltage circuits as illustrated in figure 30.
Page 17
XC14 SERIES
Page 18
NOTE − A complete unit wiring diagram is located inside the unit control box cover.
Figure 32. Typical Wiring Diagram
Start−Up and Charging Procedures
IMPORTANT
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start−up to
prevent compressor damage as a result of slugging.
1. Rotate fan to check for binding.
2. Inspect all factory− and field−installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
suction line service valves to release the refrigerant
charge (contained in outdoor unit) into the system.
4. Replace the stem caps and secure finger tight, then
tighten an additional one-sixth (1/6) of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit’s
nameplate. If not, do not start the equipment until you
have consulted the power company and the voltage
condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on
power to the indoor blower and close the outdoor unit
disconnect switch to start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
8. Check system for sufficient refrigerate by using the
procedures listed under Testing and Charging System
on page 17.
SETTING UP TO CHECK CHARGE
1. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HFC−410A.
2. Connect the manifold gauge set to the unit’s service
ports as illustrated in figure 3.
low pressure gauge to suction line service port.
high pressure gauge to liquid line service port.
INDOOR COIL AIRFLOW CHECK
Check indoor coil airflow using the Delta−T (DT) process
as illustration in figure 33.
DETERMINING CHARGE METHOD
To determine the correct charging method, use the
illustration in figure 34.
505367M 04/08
Page 18
Page 19
Temp.
of air
entering
indoor
coil ºF
A
Wet−bulb ºF
53º
DRY
BULB
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
Dry−bulb
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
T
C
Drop
19º
All temperatures are
expressed in ºF
DT
air flowair flow
INDOOR
COIL
B
B
64º
Figure 33. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart
START: Determine how refrigerant is metered
WHEN TO CHARGE?
Warm weather best
Can charge in colder weather
CHARGE METHOD? Determine by:
Metering device type
Outdoor ambient temperature
REQUIREMENTS:
Sufficient heat load in structure
Indoor temperature between 70-80ºF
(21−26ºC)
(18.3ºC) and
Above
Manifold gauge set connected to unit
Thermometers:
− to measure outdoor ambient
temperature
− to measure liquid line temperature
− to measure suction line
temperature
APPROACH OR
SUBCOOLING
Figure 34. Determining HFC−410A Charge Method
BULB
65ºF
WET
TXV
A
72º
BULB
DRY
1. Determine the desired DTMeasure entering air temperature
using dry bulb (A) and wet bulb (B). DT is the intersecting value of A
and B in the table (see triangle).
2. Find temperature drop across coilMeasure the coil’s dry bulb
entering and leaving air temperatures (A and C). Temperature Drop
Formula: (T
3. Determine if fan needs adjustmentIf the difference between the
measured T
justment is needed. See examples: Assume DT = 15 and A temp. =
72º, these C temperatures would necessitate stated actions:
Cº T
Drop
53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = −1 (within +3º range) no change
62º 10 – 15 = −5 Decrease the airflow
4. Adjust the fan speedSee indoor unit instructions to in-
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +3º.
) = A minus C.
Drop
and the desired DT (T
Drop
– DT = ºF ACTION
Drop
Which
–DT) is within +3º, no ad-
RFC
metering
device?
64ºF
(17.7ºC) and
Below
WEIGH-IN
40ºF
(4.4ºC) and
Above
39ºF
(3.8ºC) and
Below
WEIGH-INSUPERHEAT
START: Measure outdoor ambient temperature
USE EITHER APPROACH
OR SUBCOOLING
METHOD
WEIGH IN TXV
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
NOTE − *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.
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
Figure 35. Using HFC−410A Weigh In TXV Method
65ºF
and
ABOVE
ABOVE or
BELOW
Page 19
64ºF and
BELOW
1. Check Liquid and suction line pressures
2. Compare unit pressures with table 7,
Normal Operating Pressures.
3. Conduct leak check; evacuate as
previously outlined.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet.
This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor
unit for charge information.
XC14 SERIES
Page 20
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
DO NOT CHARGE UNIT
Weigh-in or remove refrigerant
(Results of charging at low
based upon line length
temperatures not reliable)
64ºF and
BELOW
If refrigerant is added
or removed, verify
charge using the
Subcooling Method.
If value is LESS
than shown, add
refrigerant.
If value is MORE
than shown, remove
refrigerant.
MORE or
LESS
65ºF
and
ABOVE
ABOVE or
BELOW
1. Confirm proper airflow across coil using figure 33.
2. Compare unit pressures with table 7, Normal
Operating Pressures.
3. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC).
4. Connect gauge set.
5. When heat demand is satisfied, set thermostat to call
for cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060
65 (18) 4 (2.2) 5 (2.8) 4 (2.2) 5 (2.8) 6 (3.3) 7 (3.9) 8 (4.4)
75 (24) 5 (2.8) 6 (3.3) 5 (2.8) 5 (2.8) 8 (4.4) 8 (4.4) 9 (5.0)
85 (29) 6 (3.3) 6 (3.3) 6 (3.3) 6 (3.3) 8 (4.4) 8 (4.4) 9 (5.0)
95 (35) 5 (2.8) 7 (3.9) 6 (3.3) 6 (3.3) 8 (4.4) 8 (4.4) 9 (5.0)
105 (41) 3 (1.7) 6 (3.3) 6 (3.3) 5 (2.8) 8 (4.4) 8 (4.4) 9 (5.0)
115 (45) 3 (1.7) 6 (3.3) 6 (3.3) 6 (3.3) 8 (4.4) 9 (5.0) 9 (5.0)
*Temperature of air entering outdoor coil
Figure 36. Using HFC−410A Approach TXV Charge Method
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
DO NOT CHARGE UNIT
Weigh-in or remove refrigerant
(Results of charging at low
based upon line length
temperatures not reliable)
64ºF and
ABOVE or
BELOW
BELOW
BLOCK OUTDOOR COIL: [sometimes necessary with lower
temperatures] Use cardboard or plastic sheet to restrict the airflow
through the outdoor coil to achieve pressures from 325−375 psig
(2240−2585 kPa). Higher pressures are needed to check charge.
Block equal sections of air intake panels and move coverings
sideways until the liquid pressure is in the above noted ranges.
If refrigerant is added
or removed, verify
charge using the
Approach Method.
If value is LESS
than shown, add
refrigerant.
If value is MORE
than shown, remove
refrigerant.
MORE or
LESS
1. Confirm proper airflow across coil using figure 33.
65ºF
and
ABOVE
SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060
65 (18) 10 (5.6) 10 (5.6) 10 (5.6) 11 (6.1) 10 (5.6) 8 (4.4) 8 (4.4)
75 (24) 6 (3.3) 8 (4.4) 8 (4.4) 11 (6.1) 7 (3.9) 8 (4.4) 7 (3.9)
85 (29) 6 (3.3) 8 (4.4) 7 (3.9) 11 (6.1) 7 (3.9) 8 (4.4) 8 (4.4)
95 (35) 6 (3.3) 8 (4.4) 7 (3.9) 10 (5.6) 7 (3.9) 8 (4.4) 7 (3.9)
105 (41) 10 (5.6) 8 (4.4) 7 (3.9) 10 (5.6) 7 (3.9) 8 (4.4) 6 (3.3)
115 (45) 10 (5.6) 8 (4.4) 6 (3.3) 9 (5.0) 7 (3.9) 7 (3.9) 6 (3.3)
*Temperature of air entering outdoor coil
2. Compare unit pressures with table 7, Normal
Operating Pressures.
3. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC)
4. Connect gauge set
5. Measure outdoor ambient temperature
6. When heat demand is satisfied, set thermostat to call
for cooling
7. Allow temperatures and pressures to stabilize.
NOTE − If necessary, block outdoor coil to maintain
325 − 375 psig.
8. Record liquid line temperature:
LIQº = ______
9. Measure liquid line pressure and use the value to
determine saturation temperature (see table 6):
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
11. Compare results with table below.
Figure 37. Using HFC−410A Subcooling TXV Charge Method
505367M 04/08
Page 20
Page 21
START: Measure outdoor ambient temperature
USE SUPERHEAT
40ºF
and
ABOVE
WEIGH IN RFC
Refrigerant Charge per Line Set Length
ABOVE or
BELOW
39ºF and
BELOW
1. Check Liquid and suction line pressures
2. Compare unit pressures with table 7,
Normal Operating Pressures.
3. Conduct leak check; evacuate as
previously outlined.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet.
Liquid Line
Set Diameter
3/8" (9.5 mm)
NOTE − *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.
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
Figure 38. Using HFC−410A Weigh In RFC Charge Method
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
Wet Bulb (air entering indoor coil)
ºF* 50 52 54 56 58 60 62 64 66 68 70 72 74 76
40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47
55 9 12141720232730333638404244
60 7 10121518212427303335384043
65 - 6 10 13 16 19 21 24 27 30 33 36 38 41
70 - - 7 1013161921242730333639
75 - - - 6 9 121518212428313437
80 - - - - 5 8 12 15 18 21 25 28 31 35
85 - - - - - - 8 11 15 19 22 26 30 33
90 - - - - - - 5 9 131620242731
95 - - - - - - - 6 101418222529
100 --------81216212428
105 --------5913172226
If refrigerant is
added, retest to
confirm that unit is
properly charged.
110 ---------611152025
115 ----------8141824
* Dry−bulb temperature (ºF) of entering outdoor ambient air.
39ºF and
BELOW
SHº (Superheat) Values (+/−5ºF)
ABOVE or
BELOW
40ºF
and
ABOVE
This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor unit
for charge information.
1. Confirm proper airflow across coil using figure 33.
2. Compare unit pressures with table 7, Normal
Operating Pressures.
3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.
4. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC)
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to
call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use
value to determine saturation temperature (table
6):
SATº =_________
9. Record suction line temperature:
VAPº =_________
10. Subtract to determine superheat (SHº):
VAPº − _____ SATº ______ = SHº______
11. Record the wet bulb temperature (air entering
indoor coil):
WB =_______
12. Record outdoor ambient temperature.
13. Compare results with table to the left.
NOTE − Do not attempt to charge system
where a dash appears, system could be
overcharged. Superheat is taken at
suction line service port. Suction line
superheat must never be less than 5ºF at
the suction line service port.
If value is LESS than
shown, add
refrigerant.
Figure 39. Using HFC−410A Superheat RFC Charge Method
MORE or
LESS
If value is MORE
than shown, remove
refrigerant.
Page 21
If refrigerant is
removed, retest to
confirm that unit is
properly charged.
XC14 SERIES
Page 22
Table 6. HFC−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig
32 100.8 48 137.1 63 178.5 79 231.6 94 290.8 110 365.0
33 102.9 49 139.6 64 181.6 80 235.3 95 295.1 111 370.0 126 451.8 142 552.3
34 105.0 50 142.2 65 184.3 81 239.0 96 299.4 112 375.1 127 457.6 143 559.1
35 107.1 51 144.8 66 187.7 82 242.7 97 303.8 113 380.2 128 463.5 144 565.9
36 109.2 52 147.4 67 190.9 83 246.5 98 308.2 114 385.4 129 469.5 145 572.8
37 111.4 53 150.1 68 194.1 84 250.3 99 312.7 115 390.7 130 475.6 146 579.8
38 113.6 54 152.8 69 197.3 85 254.1 100 317.2 116 396.0 131 481.6 147 586.8
39 115.8 55 155.5 70 200.6 86 258.0 101 321.8 117 401.3 132 487.8 148 593.8
40 118.0 56 158.2 71 203.9 87 262.0 102 326.4 118 406.7 133 494.0 149 601.0
41 120.3 57 161.0 72 207.2 88 266.0 103 331.0 119 412.2 134 500.2 150 608.1
42 122.6 58 163.9 73 210.6 89 270.0 104 335.7 120 417.7 135 506.5 151 615.4
43 125.0 59 166.7 74 214.0 90 274.1 105 340.5 121 423.2 136 512.9 152 622.7
44 127.3 60 169.6 75 217.4 91 278.2 106 345.3 122 428.8 137 519.3 153 630.1
45 129.7 61 172.6 76 220.9 92 282.3 107 350.1 123 434.5 138 525.8 154 637.5
46 132.2 62 175.4 77 224.4 93 286.5 108 355.0 124 440.2 139 532.4 155 645.0
47 134.6 78 228.0 109 360.0 140 539.0
125 445.9
141 545.6
Table 7. Normal Operating Pressures (Liquid +10 and Suction +5 psig)
Use this table to perform maintenance checks; it is not a procedure for charging the system. Minor variations in these pressures may be due to differences
IMPORTANT
in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.
Model −018 −024 −030 −036 −042 −048 −060
**Temp.
5F (5C)
Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor
*Liquid Line Pressure / Vapor Line Pressure
Expansion Valve (TXV)
65 (18) 230 / 138 233 / 138 230 / 136 240 / 137 236 / 138 238 / 136 239 / 133
70 (21) 244 / 139 250 / 138 247 / 137 259 / 138 253 / 140 256 / 138 258 / 135
75 (24) 265 / 140 271 / 140 265 / 139 278 / 139 273 / 141 277 / 139 278 / 136
80 (27) 286 / 140 291 / 141 287 / 140 299 / 139 296 / 142 299 / 140 300 / 137
85 (29) 307 / 142 313 / 143 308 / 141 321 / 140 318 / 143 320 / 139 323 / 138
90 (32) 330 / 143 335 / 143 331 / 142 344 / 141 341 / 144 343 / 140 346 / 139
95 (35) 351 / 144 361 / 145 355 / 144 368 / 142 366 / 146 369 / 141 370 / 140
100 (38) 380 / 144 384 / 146 380 / 145 393 / 143 392 / 147 395 / 142 396 / 142
105 (41) 407 / 145 412 / 147 405 / 146 419 / 144 417 / 148 422 / 144 415 / 143
110 (43) 436 / 146 436 / 148 432 / 147 446 / 145 445 / 149 450 / 146 449 / 145
115 (45) 466 / 147 468 / 149 461 / 148 477 / 146 475 / 151 481 / 148 476 / 147
Fixed Orifice (RFC)
65 (18) 232 / 124 230 / 121 231 / 123 234 / 130 248 / 135 240 / 126 244 / 125
70 (21) 248 / 127 251 / 128 249 / 127 247 / 134 266 / 138 260 / 129 263 / 128
75 (24) 267 / 131 272 / 133 270 / 132 270 / 136 285 / 141 281 / 133 281 / 131
80 (27) 286 / 135 289 / 135 291 / 136 290 / 138 305 / 143 301 / 135 303 / 134
85 (29) 307 / 138 312 / 140 314 / 140 313 / 141 327 / 145 324 / 138 324 / 136
90 (32) 328 / 141 335 / 142 337 / 142 336 / 143 349 / 147 346 / 140 347 / 139
95 (35) 351 / 143 361 / 144 359 / 144 358 / 145 372 / 149 371 / 142 370 / 141
100 (38) 375 / 146 383 / 147 383 / 146 361 / 148 396 / 150 395 / 144 394 / 143
105 (41) 400 / 148 409 / 149 408 / 147 409 / 150 421 / 152 420 / 146 418 / 145
110 (43) 426 / 150 441 / 151 433 / 149 430 / 151 447 / 153 447 / 148 444 / 146
115 (46) 457 / 153 467 / 152 467 / 151 463 / 152 476 / 154 473 / 150 471 / 147
*Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.
**Temperature of the air entering the outside coil.
505367M 04/08
Page 22
Page 23
INSTALLING SERVICE VALVE CAPS
Disconnect gauge set and re−install both the liquid and
suction service valve caps.
OUTDOOR UNIT
SERVICE VALVE
INSTALL CAPS
Figure 40. Installing Service Valve Port Caps
System Operation
The outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch
is in the ON position, the indoor blower operates
continuously.
HIGH PRESSURE SWITCH
XC14 units are equipped with a high-pressure switch that
is located in the liquid line of the compressor as illustrated
in Unit Dimensions on page 2. The switch is a Single Pole,
Single Throw (SPST), manual−reset switch with red cap
that is normally closed and removes power from the
compressor when discharge pressure rises above factory
setting at 590 + 10 psi.
DISCHARGE THERMOSTAT
Each XC14 unit is equipped with a discharge thermostat
located in the discharge line of the compressor. The switch
(SPST, auto−reset, normally closed) and removes power
from the compressor when discharge temperature
exceeds the factory setting of 220ºF +5ºF.
FILTER DRIER
A filter drier is factory-installed as illustrated in Unit
Dimensions on page 2, with each XC14 unit to ensure a
clean, moisture−free system. A replacement filter drier is
available from Lennox. Refer to Lennox Repair Part
Program.
Maintenance
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.
At the beginning of each cooling season, the system
should be checked as follows:
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. Outdoor 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 the unit (with the unit
operating).
6. Check amp−draw outdoor fan motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
NOTE − If owner reports insufficient cooling, the unit should
be gauged and refrigerant charge checked.
INDOOR COIL
1. Clean coil, if necessary.
2. Check connecting lines and coils for signs of oil leaks.
3. Check condensate line and clean, if necessary.
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. Check blower drive belt for wear and proper tension.
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: __________
Homeowner Information
MAINTENANCE
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.
1. Air FilterAsk your Lennox dealer to show you where
your indoor unit’s filter is located. It will be either at the
indoor unit (installed internal or external to the cabinet)
or behind a return air grille in the wall or ceiling. Check
the filter monthly and clean or replace it as needed.
2. Disposable FilterDisposable filters should be
replaced with a filter of the same type and size.
NOTE − If you are unsure about the filter required for
your system, call your Lennox dealer for assistance.
3. Reusable FilterMany indoor units are equipped
with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.
NOTE − The filter and all access panels must be in
place any time the unit is in operation.
4. Electronic Air CleanerSome systems are
equipped with an electronic air cleaner, designed to
remove airborne particles from the air passing through
the cleaner. If your system is so equipped, ask your
dealer for maintenance instructions.
5. Indoor UnitThe indoor unit’s evaporator coil is
equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
Page 23
XC14 SERIES
Page 24
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface
of steel and aluminum parts and diminish
performance and longevity of the unit.
6. Outdoor UnitMake sure no obstructions restrict
airflow to the outdoor unit. Leaves, trash or shrubs
crowding the unit cause the outdoor unit to work harder
and use more energy. Keep shrubbery trimmed away
from the unit and periodically check for debris which
collects around the unit. When removing debris from
around the unit, be aware of metal edges on parts and
screws. Although special care has been taken to keep
exposed edges to a minimum, physical contact with
metal edges and corners while applying excessive
force or rapid motion can result in personal injury.
Cleaning of the outdoor unit’s coil should be performed
by a trained service technician. Contact your dealer
and set up a schedule (preferably twice a year, but at
least once a year) to inspect and service your air
conditioning or heat pump system.
THERMOSTAT OPERATION
Thermostat operations vary from one thermostat to
another. The following provides general operation
procedures. Refer to the user’s information manual
provided with your thermostat for specific operation
details.
Temperature Setting Levers − Set the lever or dial to
the desired temperature setpoints for both heating and
cooling. Avoid frequent temperature adjustment;
turning the unit offthen back onbefore pressures
can equalize will put unusual stress on the unit’s
compressor.
Fan Switch − In AUTO or INT (intermittent) mode, the
blower operates only when the thermostat calls for
heating or cooling. This mode is generally preferred
when humidity control is a priority. The ON or CONT
mode provides continuous indoor blower operation,
regardless of whether the compressor or furnace is
operating. This mode is required when constant air
circulation or filtering is desired.
System Switch − Set the system switch for heating,
cooling or auto operation. The auto mode allows the
system to automatically switch from heating mode to
cooling mode to maintain predetermined comfort
settings.
Temperature Indicator − The temperature indicator
displays the actual room temperature.
PROGRAMMABLE THERMOSTATS
Your Lennox system may be controlled by a
programmable thermostat. These thermostats provide the
added feature of programmable time-of-day set points for
both heating and cooling. Refer to the user’s information
manual provided with your thermostat for operation
details.
Preservice Check
If your system fails to operate, check the following before
calling for service:
Make sure all electrical disconnect switches are ON.
Make sure the room thermostat Temperature Selector
and System Switch (Heat, Cool, Auto) are properly
set.
Check for and replace any blown fuses, or reset any
tripped circuit breakers.
Make sure unit access panels are in place.
Make sure air filter is clean.
Write down the unit model number and have it handy
before calling.
Optional Accessories
Refer to the Lennox XC14 Engineering Handbook for the
latest available accessories for this unit.
Start−Up and Performance Checklist
Job Name Job no. Date
Job Location City State
Installer City State
Unit Model No. Serial No. Service Technician
Nameplate Voltage
Rated Load Ampacity Compressor Outdoor Fan
Maximum Fuse or Circuit Breaker
Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)
Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.
Discharge Pressure Suction Pressure Refrigerant Charge Checked?
Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?
Service Valves: Fully Opened? Caps Tight? Thermostat
Voltage With Compressor Operating Calibrated? Properly Set? Level?
505367M 04/08
Page 24
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