Lennox XC14, XC14-018, XC14-024, XC14-030, XC14-036 Installation Instructions Manual

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

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

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

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

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

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

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

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