Lennox EL16XC1 Series Manual

Page 1
Corp. 1503-L7 EL16XC1
Service Literature
INSTALLATION AND SERVICE PROCEDURE
August 29, 2016
EL16XC1 (HFC-410A) SERIES UNITS WITH ALL-ALUMINUM COIL
This literature is intended as a general guide and does not
supersede local codes in any way. Consult authorities who
have jurisdiction before installation.
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.
IMPORTANT
This unit must be matched with an indoor coil as speci
fied in Lennox EL16XC1 Engineering Handbook. Coils
previously charged with HCFC-22 must be flushed.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.
Line voltage is present at all
components when unit is not in
operation on units with single‐pole
contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple
power supplies.
TABLE OF CONTENTS
Model Number Identification 2....................
Typical Serial Number Identification 2..............
Specifications 2.................................
Electrical Data 3................................
Unit Dimensions 4...............................
Unit Parts Arrangement 5........................
Operating Gauge Set and Service Valves 6.........
Outdoor Unit Placement 8........................
Removing and Installing Panels 10.................
New or Replacement Line Set 11...................
Brazing Connections 14...........................
Flushing Line Set and Indoor Coil 17................
Installing Indoor Metering Device 18................
Leak Test Line Set and Indoor Coil 19...............
Evacuating Line Set and Indoor Coil 20.............
Electrical 21.....................................
System Operation 23.............................
Maintenance 23..................................
Start-Up and Performance Checklist 24.............
Unit Electrical Diagram and Sequence
of Operations 25.................................
Servicing Units Void of Charge 27..................
Unit Start-Up 27.................................
System Refrigerant 27............................
The EL16XC1 air conditioners, which will also be referred
to in this instruction as the outdoor unit, use HFC-410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
EL16XC1 Engineering Handbook.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
Expansion valve (TXV)
Fixed orifice
IMPORTANT: Special procedures are required for
cleaning the aluminum coil in this unit. See page 23 in this
manual for information.

Page 2
Model Number Identification
CX
16 036 A
Unit Type
C = Air Conditioner
Refrigerant
X = R-410A
Nominal Cooling Capacity - Tons
018 = 1.5
024 = 2
030 = 2.5
036 = 3
041 = 3.5
042 = 3.5
047 = 4
048 = 4
060 = 5
Minor Revision Number
Nominal SEER
01
Voltage
230 = 208/230V-1phase-60hz
230
−−
EL
Product Tier
EL = Elite®Series
1
Cooling Stages
1 = Single Stage Compressor
Regional Standards
– (dash) = All Regions or Southwest Region
(dependent on size)
S = North and South Regions
Ratings Revision Level
Typical Serial Number Identification
8 09 C
Year Code
08 = 2008
09 = 2009
10 = 2010
Month Code
A = January
B = February
C = March
05716
5 (or 6) Digit Unique Number
Location Code
19 = Saltillo, Mexico
58 = Marshalltown, IA
5
Specifications
Model Numbers
Unit Outdoor Fan
Sound Rating Number
(dB)1Factory Refrigerant Charge2Number of Blades Diameter - inches.
EL16XC1-018 72 4 lbs. 9 oz. 3 18
EL16XC1-024 72 4 lbs. 9 oz. 3 22
EL16XC1-030 71 5 lbs. 8 oz. 3 22
EL16XC1-036
EL16XC1S036 73 7 lbs. 1 oz. 3 22
EL16XC1-041 72 9 lbs. 9 oz. 3 22
EL16XC1-042 72 8 lbs. 12 oz. 3 22
EL16XC1-047 72 11 lbs. 0 oz. 4 26
EL16XC1-048 75 9 lbs. 12 oz. 4 22
EL16XC1-060 73 12 lbs. 0 oz. 3 26
1Tested according to AHRI Standard 270-2008 test conditions.
2Refrigerant charge sufficient for 15 foot length of refrigerant lines.

Page 3
EL16XC1 SERIES
Electrical Data
208/230V - 60 Hz - 1 ph
Model Numbers
Unit Compressor Condenser Fan
Maximum
Over-
current
Protection
(amps)1
Minimum
Circuity
Ampacity2
Rated Load
Amps (RLA)
Locked Ro
tor Amps
(LRA)
Motor HP Nominal
RPM
Full Load
Amps (FLA)
Locked Ro
tor Amps
(LRA)
EL16XC1-018 20 11.9 9.0 48.0 1/10 1075 0.7 1.3
EL16XC1-024 25 14.6 10.9 59.3 1/6 825 1.0 1.9
EL16XC1-030 25 17.0 12.8 67.8 1/6 825 1.0 1.9
EL16XC1-036
EL16XC1S036 30 18.0 13.6 79.0 1/6 825 1.0 1.9
EL16XC1-041 30 19.3 14.7 75.0 1/6 825 1.0 1.9
EL16XC1-042 40 23.4 17.9 112.0 1/6 825 1.0 1.9
EL16XC1-047 35 21.9 16.1 105.5 1/3 825 1.8 2.9
EL16XC1-048 40 24.2 18.0 117.0 1/4 825 1.7 3.2
EL16XC1-060 50 29.6 22.2 127.9 1/3 825 1.8 2.9
1HACR type circuit breaker or fuse.
2Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 4
Unit Dimensions - Inches (mm)
ELECTRICAL INLETS
SIDE VIEW
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
4.25”
(108MM)
4.75”
(121MM)
TOP VIEW
UNIT SUPPORT
FEET
8.50”
(216MM)
D
G
K
J
E
F
EL16XC1-018 BASE SECTION
(Small Base)
8.75”
(222MM)
5.50”
(140MM)
9.25”
(241MM)
8.25”
(210MM)
13.50”
(343MM)
UNIT SUPPORT
FEET
EL16XC1-024 TO -060 BASE SECTION
(Medium and Large Base)
H
A
B
C
Model Numbers EL16XC1-XXX-230-XX — Dimensions - in. (mm)
A B C D E F G H J K
EL16XC1-018 31 (787) 27 686) 28 (711) See above.
EL16XC1-024 31 (787) 30-1/2
(775) 35 (889) 13-7/8 (352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
EL16XC1-030 39 (991) 30-1/2
(775) 35 (889) 13-7/8 (352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
EL16XC1-036
EL16XC1S036 31 (787) 30-1/2 (775) 35 (889) 13-7/8 (352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
EL16XC1-041 35 (889) 30-1/2
(775) 35 (889) 13-7/8 (352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
EL16XC1-042 39 (991) 30-1/2
(775) 35 (889) 13-7/8 (352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
EL16XC1-047 35 (889) 35-1/2
(902)
39-1/2
(1003)
16-7/8
(429)
8-3/4
(222)
3-1/8
(79)
30-3/4
(781)
4-5/8
(117)
3-3/4
(95)
26-7/8
(683)
EL16XC1-048 39 (991) 30-1/2
(775) 35 (889) 13-7/8 (352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
EL16XC1-060 45 (1143) 35-1/2
(902)
39-1/2
(1003)
16-7/8
(429)
8-3/4
(222)
3-1/8
(79)
30-3/4
(781)
4-5/8
(117)
3-3/4
(95)
26-7/8
(683)

Page 5
EL16XC1 SERIES
Typical Unit Parts Arrangement
LIQUID LINE
FILTER DRIER
(SINGLE FLOW)
LIQUID LINE SERVICE
VALVE
SUCTION LINE
SERVICE VALVE
FIELD CONNECTION
FOR SUCTION LINE
HIGH PRESSURE
SWITCH (S4)
COMPRESSOR
HARNESS
GROUND LUG
CONTACTOR - 1 POLE (K1-1)
CAPACITOR (C12)
CONTROL PANEL
TYPICAL PLUMBING
(COPELAND COMPRESSOR)
DISCHARGE-LINE HIGH
TEMPERATURE SENSOR
LIQUID LINE
FILTER DRIER
(SINGLE FLOW)
DISCHARGE-LINE HIGH
TEMPERATURE SENSOR
COMPRESSOR
HARNESS
HIGH PRESSURE
SWITCH (S4)
LIQUID LINE SERVICE
VALVE
SUCTION LINE
SERVICE VALVE
FIELD CONNECTION
FOR SUCTION LINE
FIELD CONNECTION
FOR LIQUID LINE FIELD CONNECTION
FOR LIQUID LINE
TYPICAL PLUMBING
(LG COMPRESSOR)
Figure 1. Typical Parts Arrangements

Page 6
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.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Operating Gauge Set and Service Valves
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
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.
See the Lennox Service and Application Notes #C-08-1
for further details and information.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
Table 1. Torque Requirements
Parts Recommended Torque
Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #10 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 - 800 psig on the high side and a low
side of 30” vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig burst rating.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a
factory-installed valve stem. Figure 2 provides information
on how to access and operating both angle and ball service
valves.

Page 7
EL16XC1 SERIES
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
SERVICE PORT CORE
SERVICE PORT CAP
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
SERVICE PORT
CORE
TO OUTDOOR UNIT
STEM CAP
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
TO INDOOR
UNIT
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
BALL (SHOWN
CLOSED)
SERVICE PORT
CORE
TO INDOOR UNIT
TO OUTDOOR
UNIT
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CAP
STEM CAP
VALVE
STEM
SERVICE VALVES ANGLE AND BALL
Operating Angle Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back
the stem out counterclockwise as far as it will go.
Operating Ball Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open valve,
roate stem counterclockwise 90°. To close rotate stem clockwise
90°.
123
4
5
6
7
8
9
10
11 12
1/12 TURN
To Access Service Port:
A service port cap protects the service port core from contamination and
serves as the primary leak seal.
1. Remove service port cap with an appropriately sized wrench.
2. Connect gauge set to service port.
3. When testing is completed, replace service port cap and tighten as
follows:
With torque wrench: Finger tighten and
torque cap per table 1.
Without torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
12
3
4
5
6
7
8
9
10
1112
1/6 TURN
WHEN SERVICE VALVE IS CLOSED,THE SERVICE PORT IS OPEN
TO THE LINE SET AND INDOOR UNIT.
When service valve is OPEN, the service port is
open to linE set, indoor and outdoor unit.
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
With Torque Wrench: Finger tighten and
then torque cap per table 1.
Without Torque Wrench: Finger tight
en and use an appropriately sized
wrench to turn an additional 1/12 turn
clockwise.
NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
Figure 2. Angle and Ball Service Valves

Page 8
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
See
NOTES
See NOTES
NOTES:
Service clearance of 30 in. must be maintained on one of the sides
adjacent to the control box.
Clearance to one of the other three sides must be 36 in.
Clearance to one of the remaining two sides may be 12 in. and the
final side may be 6 in..
A clearance of 24 in. must be maintained
between two units.
48 in. clearance required on top of unit.
See
NOTES
See NOTES Control
Box
NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for
the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may
have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be
required to prevent air recirculation when the unit is installed under a deck or in another tight space.)
Figure 3. Installation Clearances
Outdoor Unit Placement
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
See Unit Dimensions on page 3 for sizing mounting slab,
platforms or supports. Refer to figure 3 for mandatory
installation clearance requirements.
POSITIONING CONSIDERATIONS
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 4,
detail A.
PLACING UNIT ON SLAB
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 4,
detail B.
NOTE — If necessary for stability, anchor unit to slab as
described in figure 4, detail D.
ELEVATING THE UNIT
Units are outfitted with elongated support feet as illustrated
in figure 4, detail C.
If additional elevation is necessary, raise the unit by
extending the height of the unit support feet. This may be
achieved by using a 2 inch (50.8mm) Schedule 40 female
threaded adapter.
The specified coupling will fit snuggly into the recessed
portion of the feet. Use additional 2 inch (50.8mm)
Schedule 40 male threaded adaptors which can be
threaded into the female threaded adaptors to make
additional adjustments to the level of the unit.
NOTE — Keep the height of extenders short enough to
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.

Page 9
EL16XC1 SERIES
LEG DETAIL
BASE
2” (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
Concrete slab — use two plastic anchors (hole
drill 1/4”)
Wood or plastic slab — no plastic anchor (hole
drill 1/8”)
COIL
BASE PAN
CORNER POST
STABILIZING BRACKET (18 GAUGE
METAL — 2” WIDTH; HEIGHT AS
REQUIRED)
— Slab Side Mounting
#10 1/2” LONG SELF-DRILLING
SHEET METAL SCREWS
#10 1-1/4” LONG HEX HD SCREW
AND FLAT WASHER
MINIMUM ONE
PER SIDE
Stabilizing bracket (18 gauge metal — 2” (50.8mm) width; height as required); bend to form
right angle as exampled below.
FOR EXTRA
STABILITY
— Deck Top Mounting
— Elevated Slab Mounting
using Feet Extenders
STABILIZING UNIT ON UNEVEN SURFACES
Install unit level or, if on a slope, maintain slope tolerance of two (2)
degrees (or two inches per five feet [50 mm per 1.5 m]) away from
building structure.
MOUNTING
SLAB
BUILDING
STRUCTURE
GROUND LEVEL
— Outside Unit Placement — Slab Mounting at Ground Level
SAME FASTENERS AS
SLAB SIDE MOUNTING.
IMPORTANT — 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.
DETAIL A DETAIL B
DETAIL C
DETAIL D
2” (50.8MM) SCH 40
MALE THREADED
ADAPTER
Use additional 2” SCH 40 male threaded adapters
which can be threaded into the female threaded
adapters to make additional adjustments to the level of
the unit.
TWO 90° ELBOWS INSTALLED IN LINE SET WILL
REDUCE LINE SET VIBRATION.
Install unit away from windows.
One bracket per side (minimum). For extra stability, two brackets per side, two inches
(51mm) from each corner.
DETAIL E
Figure 4. Placement, Slab Mounting and Stabilizing Unit

Page 10
STABILIZING UNIT ON UNEVEN SURFACES
IMPORTANT
Unit Stabilizer Bracket Use (field-provided):
Always use stabilizers when unit is raised above the
factory height. (Elevated units could become unstable in
gusty wind conditions).
Stabilizers may be used on factory height units when
mounted on unstable an uneven surface.
With unit positioned at installation site, perform the
following:
1. Remove two side louvered panels to expose the unit
base.
2. Install the brackets as illustrated in figure 4, detail D
using conventional practices.
3. Replace the panels after installation is complete.
ROOF MOUNTING
Install the unit a minimum of 6 inches (152 mm) above the
roof surface to avoid ice build-up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
rooftop applications.
If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed. Size barrier at
least the same height and width as outdoor unit. Mount
barrier 24 inches (610 mm) from the sides of the unit in the
direction of prevailing winds.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.
Removing and Installing Panels
IMPORTANT
Do not allow panels to hang on unit by top tab. Tab is for
alignment and not designed to support weight of panel.
IMPORTANT
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.
WARNING
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.

Page 11
EL16XC1 SERIES
LOUVERED PANEL REMOVAL
Remove the louvered panels as follows:
1. Remove two screws, allowing the panel to swing open slight
ly.
2. Hold the panel firmly throughout this procedure. Rotate bot
tom corner of panel away from hinged corner post until lower
three tabs clear the slots as illustrated in detail B.
3. Move panel down until lip of upper tab clears the top slot in
corner post as illustrated in detail A.
LOUVERED PANEL INSTALLATION
Position the panel almost parallel with the unit as illustrated in
detail D with the screw side as close to the unit as possible.
Then, in a continuous motion:
1. Slightly rotate and guide the lip of top tab inward as illus
trated in detail A and C; then upward into the top slot
of the hinge corner post.
2. Rotate panel to vertical to fully engage all tabs.
3. Holding the panel's hinged side firmly in place, close the
right-hand side of the panel, aligning the screw holes.
4. When panel is correctly positioned and aligned, insert
the screws and tighten.
DETAIL A
DETAIL B
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE
PANEL
SCREW
HOLES
LIP
IMPORTANT! DO NOT ALLOW PANELS TO HANG ON UNIT BY TOP TAB. TAB IS FOR
ALIGNMENT AND NOT DESIGNED TO SUPPORT WEIGHT OF PANEL.
PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR
ENTER) TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT
AS POSSIBLE) WHILE INSTALLING PANEL.
PREFERRED ANGLE
FOR INSTALLATION
ANGLE MAY BE TOO
EXTREME
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY-ENGAGED TABS
Detail C
Figure 5. Removing and Installing Panels
New or Replacement Line Set
REFRIGERANT LINE SET
This section provides information on installation or
replacement of existing line set. If new or replacement line
set is not being installed then proceed to Brazing
Connections on page 14.
IMPORTANT
Lennox highly recommends changing line set when
converting the existing system from HCFC-22 to
HFC-410A.If that is not possible and the line set is the
proper size as referenced in table 2, use the procedure
outlined under Flushing the System on page 13.
If refrigerant lines are routed through a wall, then 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. See figure 6 for recommended
installation practices. Also, consider the following when
placing and installing a high-efficiency outdoor unit.
Liquid lines that meter the refrigerant, such as RFC1 liquid
lines, must not be used in this application. Existing line set
of proper size as listed in table 2 may be reused. If system
was previously charged with HCFC-22 refrigerant, then
existing line set must be flushed (see Flushing on page
17).

Page 12
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit to the indoor unit coil (braze
connections). Use Lennox L15 (sweat, non-flare) series
line set, or field-fabricated refrigerant line sizes as listed in
table 2.
To obtain the correct information from Lennox, be sure to
communicate the following information:
Model (EL16XC1) and size of unit (e.g. -036).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows / vertical rise or drop in the piping.
IMPORTANT
Mineral oils are not compatible with HFC-410A.If oil
must be added, it must be a Polyol ester oil.
The compressor is charged with sufficient Polyol ester oil
for line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the
system. No need to add oil in system with 20 pounds of
refrigerant or less. For systems over 20 pounds - add one
ounce for every five pounds of refrigerant over 20 pounds.
Recommended topping-off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATERL32CF.
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).
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
Table 2. Service Valve Sizes and Refrigerant Line Set Recommendations
Model Service Valve Sizes Recommended Line Set
Liquid Line Suction Line Liquid Line Suction Line L15 Series Line Sets
-018, -024, -030 3/8 in. (10 mm) 3/4 in. (19 mm) 3/8 in. (10 mm) 3/4 in. (19 mm) L15-41 — 15 feet to 50 feet (4.6
meters to 15 meters)
-036, -041, -042, -047, -048 3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in. (22 mm) L15-65 — 15 feet to 50 feet (4.6
meters to 15 meters)
-060 3/8 in. (10 mm) 1-1/8 in. (25 mm) 3/8 in. (10 mm) 1-1/8 in. (25 mm)
NOTE — Some applications may require a field provided 7/8” to 1-1/8” adapter
NOTE — When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication
Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance.

Page 13
EL16XC1 SERIES
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER‐TYPE HANGER
STRAP LIQUID LINE TO
VAPOR LINE
WALL
STUD
LIQUID LINE
NON-CORROSIVE
METAL SLEEVE
VAPOR LINE - WRAPPED
IN ARMAFLEX
AUTOMOTIVE
MUFFLER‐TYPE HANGER
REFRIGERANT LINE SET — TRANSITION
FROM VERTICAL TO HORIZONTAL
Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation:
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIE
WIRE TIE (AROUND
VAPOR LINE ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.
8 FEET (2.43 METERS)
STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
FLOOR JOIST OR
ROOF RAFTER
REFRIGERANT LINE SET — INSTALLING
HORIZONTAL RUNS
NOTE — Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
OUTSIDE
WALL
VAPOR LINE WRAPPED
WITH ARMAFLEX
LIQUID
LINE
OUTSIDE WALL LIQUID LINE
VAPOR LINE
WOOD BLOCK
BETWEEN STUDS
STRAP
WOOD BLOCK
STRAP
SLEEVE
WIRE TIE
WIRE TIE
WIRE TIE
INSIDE WALL
REFRIGERANT LINE SET — INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
NOTE — Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperatureof the liquid line or when pressure drop is equal to or greater
than 20 psig.
NON-CORROSIVE
METAL SLEEVE
NON-CORROSIVE
METAL SLEEVE
8 FEET (2.43 METERS)
Figure 6. Line Set Installation

Page 14
Brazing Connections
Use the procedures outlined in figures 7 and 8 for brazing
line set connections to service valves.
WARNING
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result
in ignition of the refrigerant and oil
mixture - Check the high and low
pressures before applying heat.
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).
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well-ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
IMPORTANT
Connect gauge set low pressure side to vapor line
service valve and repeat procedure starting at
paragraph 4 for brazing the liquid line to service port
valve.
IMPORTANT
Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver
alloy for copper-to-copper brazing. Use 45% minimum
alloy for copper-to-brass and copper-to-steel brazing.
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 fire and/or an ex
plosion, that could result in property
damage, personal injury or death.

Page 15
EL16XC1 SERIES
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES
OUTDOOR
UNIT
LIQUID LINE
VAPOR LINE
LIQUID LINE SERVICE
VALVE
SUCTION /
VAPOR LINE
SERVICE
VALVE
ATTACH
GAUGES
INDOOR
UNIT
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
A Connect gauge set low pressure side to
liquid line service valve (service port).
B Connect gauge set center port to bottle of
nitrogen with regulator.
C Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
NITROGEN
HIGHLOW
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
B
A
C
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.
CUT AND DEBUR CAP AND CORE REMOVAL
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
Remove service cap and core from
both the suction / vapor and liquid line
service ports.
12
LIQUID LINE SERVICE
VALVE
SERVICE
PORT
CORE
SERVICE PORT
CAP
SERVICE
PORT
CORE
SERVICE
PORT CAP
CUT AND DEBUR
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
COPPER TUBE
STUB
SERVICE VALVE
CONNECTION
REFRIGERANT LINE
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
REDUCER
3
SUCTION / VAPOR LINE
SERVICE VALVE
LINE SET SIZE IS SMALLER
THAN CONNECTION
Figure 7. Brazing Procedures

Page 16
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
LIQUID LINE SERVICE VALVE
LIQUID LINE
BRAZE LINE SET
Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water
saturated cloths must remain water saturated throughout the brazing and cool-down process.
WATER SATURATED
CLOTH
IMPORTANT — Allow braze joint to cool. Apply
additional water saturated cloths to help cool brazed
joint. Do not remove water saturated cloths until piping
has cooled. Temperatures above 250ºF will damage
valve seals.
6
SUCTION / VAPOR LINE
WATER SATURATED
CLOTH
SUCTION / VAPOR LINE
SERVICE VALVE
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both
services valves to cool piping. Once piping is cool, remove all water saturated cloths. Refer to the unit installation instructions for the next step
in preparing the unit.
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
PREPARATION FOR NEXT STEP
7
WARNING
1. FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE will result if you do not wrap a water
saturated cloth around both liquid and suction line
service valve bodies and copper tube stub while
brazing in the line set! The braze, when complete,
must be quenched with water to absorb any residual
heat.
2. Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated.
Refer to procedures provided in this supplement.
WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use
additional water saturated cloths underneath the valve body to protect the base paint.
4
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections
5
Figure 8. Brazing Procedures (continued)

Page 17
EL16XC1 SERIES
Flushing Line Set and Indoor Coil
SENSING
LINE
TEFLON®RING
FIXED ORIFICE
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON®SEAL
(IF PRESENT)
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor as
sembly.
C Using two wrenches, disconnect liquid line from liquid line orifice hous
ing. Take care not to twist or damage distributor tubes during this pro
cess.
D Remove and discard fixed orifice, valve stem assembly if present and
Teflon®washer as illustrated above.
E Use a field-provided fitting to temporary reconnect the liquid line to the
indoor unit's liquid line orifice housing.
TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE (UNCASED
COIL SHOWN)
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
CHECK
EXPANSION
VALVE
TEFLON®
RING
STUB END
TEFLON®
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor
assembly.
C Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D Remove the vapor line sensing bulb.
E Disconnect the liquid line from the check expansion valve at the liquid
line assembly.
F Disconnect the check expansion valve from the liquid line orifice
housing. Take care not to twist or damage distributor tubes during this
process.
G Remove and discard check expansion valve and the two Teflon®rings.
H Use a field-provided fitting to temporary reconnect the liquid line to the
indoor unit's liquid line orifice housing.
LOW HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
INVERTED HCFC-22
CYLINDER CONTAINS
CLEAN HCFC-22* TO BE
USED FOR FLUSHING.
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
VAPOR
LIQUID
1
A Inverted HCFC-22 cylinder with clean refrigerant* to the vapor service
valve.
B HCFC-22 gauge set (low side) to the liquid line valve.
C HCFC-22 gauge set center port to inlet on the recovery machine with an
empty recovery tank to the gauge set.
D Connect recovery tank to recovery machines per machine instructions.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
A
B
C
D
B
OR
FLUSHING LINE SET
A 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.
B Invert the cylinder of clean HCFC-22* and open its valve to allow
liquid refrigerant to flow into the system through the vapor 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.
C After all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC-22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.
D 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.
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.
1A
2
3
1B
*IMPORTANT - Clean refrigerant is any refrigerant in a system that has not had compressor burn out. If the system
has experienced burn out, it is recommended that the existing line set and indoor coil be replaced.
Figure 9. Installing Indoor Expansion Valve

Page 18
Installing Indoor Metering Device
This outdoor unit is designed for use in systems that use
either fixed orifice or expansion valve metering devices at
the indoor coil.
If using a fixed orifice metering device, use the the one
provided with the outdoor unit. The metering device is
located in the installation instruction bag. For installing
the orifice, reverse the procedure outlined in figure 9,
1A.
See the Lennox EL16XC1 Engineering Handbook for
approved expansion valve kit match-ups. The
expansion valve 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 expansion valve in a manner that
will provide access for field servicing of the expansion
valve. Refer to below illustration for reference during
installation of expansion valve unit.
A Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
NOTE — Confirm proper thermal contact between vapor line
and expansion bulb before insulating the sensing bulb once
installed.
B Connect the equalizer line from the expansion valve to
the equalizer vapor port on the vapor line. Finger tighten
the flare nut plus 1/8 turn (7 ft-lbs) as illustrated below.
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
VAPOR
LINE
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
LIQUID LINE
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
SENSING
LINE
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
mounted external to the coil casing. See
sensing bulb installation for bulb positioning.
STUB
END
TEFLON®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
A Remove the field-provided fitting that temporary
reconnected the liquid line to the indoor unit's distributor
assembly.
B Install one of the provided Teflon®rings around the
stubbed end of the expansion valve and lightly lubricate
the connector threads and expose surface of the Teflon®
ring with refrigerant oil.
C Attach the stubbed end of the expansion valve 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 the figure above, or 20 ft-lb.
D Place the remaining Teflon®washer around the other
end of the expansion valve. Lightly lubricate connector
threads and expose surface of the Teflon®ring with
refrigerant oil.
E Attach the liquid line assembly to the expansion valve.
Finger tighten and use an appropriately sized wrench to
turn an additional 1/2 turn clockwise as illustrated in the
figure above or 20 ft-lb.
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.
12
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB BETWEEN THE 3 AND
9 O'CLOCK POSITIONS.
12
BULB
VAPOR LINE
NOTE — NEVER MOUNT ON BOTTOM OF LINE.
BULB
BULB
BULB
VAPOR LINE
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
123
4
5
6
7
8
9
10
11 12
1/2 Turn
SENSING BULB INSTALLATION
EQUALIZER LINE INSTALLATION
123
4
5
6
7
8
9
10
11 12
1/8 Turn
A Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port
on the vapor line as illustrated in the figure to the right.
B Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port on
the vapor line as illustrated in the figure to the right.
INDOOR EXPANSION VALVE INSTALLATION
9 O'CLOCK TO
3 O'CLOCK
Figure 10. Installing Indoor Expansion Valve

Page 19
EL16XC1 SERIES
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.
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.
Leak Test Line Set and Indoor Coil
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).
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.
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.
TO VAPOR
SERVICE VALVE
HFC-410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGHLOW
NITROGEN
A 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 (vapor only).
B 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.
C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
D 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.
E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak
detector.
F After leak testing disconnect gauges from service ports.
After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the
following procedure to test for leaks:
A Connect an HFC-410A manifold gauge set high pressure
hose to the vapor valve service port.
NOTE — Normally, the high pressure hose is connected to
the liquid line port. However, connecting it to the vapor port
better protects the manifold gauge set from high pressure
damage.
B With both manifold valves closed, connect the cylinder of
HFC-410A refrigerant to the center port of the manifold gauge
set.
NOTE — Later in the procedure,
the HFC-410A container will be
replaced by the nitrogen
container.
1CONNECT GAUGE SET
2TEST FOR LEAKS
A
B
Figure 11. Leak Test

Page 20
Evacuating Line Set and Indoor Coil
A Open both manifold valves and start the vacuum pump.
B 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. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE — The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of
pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
Close manifold gauge valves
Close valve on vacuum pump
Turn off vacuum pump
Disconnect manifold gauge center port hose from vacuum pump
Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor unit.
Close manifold gauge valves.
D Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the
dry nitrogen from the line set and indoor unit.
E Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
F 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 1 to 2 psig in order to release the vacuum in the line set and
indoor unit.
G Perform the following:
OUTDOOR
UNIT
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MICRON
GAUGE
VACUUM PUMP
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
MANIFOLD
GAUGE SET
HFC-410A
RECOMMEND
MINIMUM 3/8” HOSE
AConnect low side of manifold gauge set
with 1/4 SAE in-line tee to vapor line
service valve
BConnect high side of manifold gauge
set to liquid line service valve
CConnect micron gauge available
connector on the 1/4 SAE in-line tee.
DConnect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC-410A and nitrogen containers.
HIGHLOW
12
3
4
5
6
7
8
9
1011 12
1/6 TURN
NITROGEN
1CONNECT GAUGE SET
A
B
C
D
2EVACUATE THE SYSTEM
NOTE — Remove cores from service valves (if not already done).
Close manifold gauge valves.
Shut off HFC-410A cylinder.
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
Replace stem caps and secure finger tight, then tighten an additional one-sixth (1/6) of a turn as illustrated.
Figure 12. Evacuating System