Lennox Elite series User manual

Page 1
6/2013 506772-01
*2P62013* *P506772-01*
E2013 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
General
This XP14 outdoor heat pump is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
XP14 Product Specifications bulletin (EHB) for approved
indoor component match ups.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
INSTALLATION
INSTRUCTIONS
Elite®Series XP14 Units
HEAT PUMP
506772-01
6/2013
Supersedes 1/2013
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal inju
ry or loss of life.
Installation and service must be performed by a licensed
professional installer (or equivalent) or service agency.
NOTICE !
For more in-depth information, consult the Installa
tion and Service Procedures manual, available as
Corp. 0721-L7 on DaveNet or through the Technical
Support department at 800-453-6669.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment.
STEP 1 -- SETTING THE UNIT -- Clearances
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
FIGURE 1
Litho U.S.A.

Page 2
UNIT DIMENSIONS - INCHES (MM)
ELECTRICAL INLETS
SIDE VIEW
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
4-1/2”
(108)
4-3/4”
(121)
TOP VIEW
A
B
C
Model Number A B C
XP14-018-230 31 (787)
30-1/2 (775) 35 (889)
XP14-024-230 39 (991)
XP14-030-230 39 (991)
XP14-036-230 35 (889)
XP14-042-230 39 (991)
35-1/2 (902) 39-1/2 (1003)
XP14-048-230 39 (991)
XP14-060-230 45 (1143)
16-7/8
(429)
30-3/4
(781)
26-7/8
(683)
3-3/4
(95)
8-3/4
(222)
3-1/8
(79)
XP14-042 TO -060 BASE WITH
ELONGATED LEGS (LARGE)
4-5/8
(117)
13-7/8
(352) K
J
UNIT SUPPORT FEET
XP14-018 AND -036 BASE WITH
ELONGATED LEGS (MEDIUM)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689) 3-5/8
(92)
4-1/2
(114)
20-5/8
(524)
UNIT SUPPORT FEET
STEP 1 -- SETTING THE UNIT (Continued)
-- Unit Placement
NOTICE !
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil, causing the
rubber to degrade. Failure to follow this notice
could result in damage to roof surface.
WARNING
To prevent personal injury, as well as damage to panels,
unit or structure, observe the following:
While installing or servicing this unit, carefully stow all
removed panels so that the panels will not cause injury
to personnel, objects or nearby structures. Also, take
care to store panels where they will not be subject to
damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions (especially wind) that may cause
panels to be blown around and damaged.

Page 3
XP14 SERIES
IMPORTANT !
Exhaust vents from dryers, water heaters and
furnaces should be directed away from the outdoor
unit. Prolonged exposure to exhaust gases and the
chemicals contained within them may cause
condensation to form on the steel cabinet and other
metal components of the outdoor unit. This will
diminish unit performance and longevity.
PLACEMENT
TWO 90° ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION.
Install unit away from windows.
FIGURE 2
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.
SLAB MOUNTING
MOUNTING
SLAB
BUILDING
STRUCTURE
GROUND LEVEL
FIGURE 3
CAUTION
Before attempting to perform any service or mainte
nance, turn the electrical power to unit OFF at discon
nect switch.
LEG DETAIL
BASE
2” (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
ELEVATED SLAB MOUNTING USING FEET
EXTENDERS
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.
FIGURE 4
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 any unit installed
on unstable and uneven surfaces.
Concrete slab — use two
plastic anchors (hole drill 1/4”)
COIL
BASE PAN
CORNER POST
STABILIZING BRACKET
(18 GAUGE METAL — 2”
WIDTH; HEIGHT AS
REQUIRED)
#10 X 1/2” LONG
SELF-DRILLING
SHEET METAL
SCREWS
#10 X 1-1/4” LONG
HEX HD SCREW AND
FLAT WASHER
STABILIZING UNIT ON UNEVEN SURFACES
!IMPORTANT !
FIGURE 5

Page 4
STEP 2 -- REFRIGERANT PIPING -- Flush
ing Existing Line Set & Indoor Coil
Flush the existing line set per the following instruc
tions. For more information, refer to the Installation
and Service Procedures manual available on Dave
Net. CAUTION -DO NOT attempt to flush and re-use ex
isting line sets or indoor coil when the system con
tains contaminants (i.e., compressor burn out).
NOTE - When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Design and Fabrication
Guidelines manual available on DaveNet (Corp. 9351-L9),
or contact the Technical Support Department Product Ap
plication group for assistance.
NOTE - For new or replacement line set installation, refer
to Service and Application Note - Corp. 9112-L4 (C-91-4).
TABLE 1
REFRIGERANT LINE SET — INCHES (MM)
Model
Valve Field
Connections Recommended Line Set
Liquid
Line
Vapor
Line
Liquid
Line
Vapor
Line L15 Line Sets
-018 3/8 in.
(10
mm)
3/4 in.
(19
mm)
3/8 in.
(10
mm)
3/4 in.
(19
mm)
L15-41 — 15 ft. -
50 ft. (4.6 m - 15
m)
-024
-030
-036 3/8 in.
(10
mm)
7/8 in.
(22
mm)
3/8 in.
(10
mm)
7/8 in.
(22
mm)
L15-65 — 15 ft. -
50 ft. (4.6 m - 15
m)
-042
-048
-060
3/8 in.
(10
mm)
1-1/8
in. (29
mm)
3/8 in.
(10
mm)
1-1/8
in. (29
mm)
Field Fabricated
NOTE — Some applications may required a field provided 7/8” to
1-1/8” adapter
IMPORTANT !
If this unit is being matched with an approved line
set or indoor unit coil that 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 installa
tion. Take care to empty all existing traps. Polyol es
ter (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 sys
tem performance and capacity.
Failure to properly flush the system per this instruc
tion and the detailed Installation and Service Proce
dures manual will void the warranty.
WARNING
When using a high pressure gas such as
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).
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 Haz
ard. Failure to follow this warning could re
sult 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 explosion, that could result in
property damage, personal injury or death.
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.
IMPORTANT !
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction pres
sure goes below 20 psig. A hissing sound will be
heard when the compressor is running unloaded.
Protector will reset when low pressure in system is
raised above 40 psig. DO NOT REPLACE COM
PRESSOR.

Page 5
XP14 SERIES
STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device
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 from 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 temporarily 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 from 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 temporarily reconnect the liquid line to
the indoor unit's liquid line orifice housing.
LOW HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
CYLINDER CONTAINING
CLEAN HCFC-22 TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
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. HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid
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 connected to the gauge set.
D. Connect recovery tank to recovery machine 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. Position the cylinder of clean HCFC-22 for delivery of liquid
refrigerant 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 the system
down to 0.
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
FIGURE 6

Page 6
STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures
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
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.
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.

Page 7
XP14 SERIES
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. 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.
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
PREPARATION FOR NEXT STEP
7
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
WARNING
FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE
may 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 the line set! The braze, when
complete, must be quenched with water to absorb any
residual heat.
Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated. Refer
to Installation and Service Procedures manual found on
DAVENET.
FIGURE 7 (CONTINUED)

Page 8
STEP 3 -- INSTALLING INDOOR EXPANSION VALVE
This outdoor unit is designed for use in systems that include an check/expansion valve metering device. See the XP14
Product Specifications bulletin (EHB) for approved check/expansion valve kit match-ups and application information. The
check/expansion valve 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 check/expansion valve in a manner that will provide access for future field
service of the check expansion valve. Refer to below illustration for reference during installation of check/expansion valve.
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 check expansion bulb before insulating the sensing bulb
once installed.
B. Connect the equalizer line from the check 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
CHECK
EXPANSION
VALVE
TEFLON®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.
STUB
END
TEFLON®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
C. Install one of the provided Teflon®rings around the
stubbed end of the check expansion valve and lightly
lubricate the connector threads and expose surface of
the Teflon®ring with refrigerant oil.
D. Attach the stubbed end of the check 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 tighten to
20 ft-lb.
E. Place the remaining Teflon®washer around the other
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon®
ring with refrigerant oil.
F. Attach the liquid line assembly to the check 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 tighten to 20 ft-lb.
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
12
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
12
BULB
VAPOR LINE
VAPOR LINE
NOTE — NEVER MOUNT THE SENSING BULB
ON BOTTOM OF LINE.
BULB
BULB
BULB
VAPOR LINE
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
12
3
4
5
6
7
8
9
10
11 12
1/2 Turn
SENSING BULB INSTALLATION
EQUALIZER LINE INSTALLATION
12
3
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 below.
B. Remove the field-provided fitting that temporarily recon
nected the liquid line to the indoor unit's distributor assemb
ly.
INDOOR EXPANSION VALVE INSTALLATION
FIGURE 8

Page 9
XP14 SERIES
STEP 4 -- LEAK TEST AND EVACUATION
TO VAPOR
SERVICE VALVE
HFC-410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGHLOW
CONNECT GAUGE SET
AConnect the high pressure hose of an HFC-410A manifold gauge set 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.
BWith 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.
TEST FOR LEAKS
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:
AWith 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).
BOpen 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) refriger
ant 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.
CConnect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold
gauge set.
DAdjust 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.
EAfter 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.
FAfter leak testing, disconnect gauges from service ports.
1
2
A
B
NITROGEN
NOTE - Position
canister to deliver
liquid refrigerant.
FIGURE 9

Page 10
STEP 4 -- LEAK TEST AND EVACUATION (Continued)
AOpen both manifold valves and start the vacuum pump.
BEvacuate 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 above absolute zero within a given volume or system. Absolute pressure
in a vacuum is equal to atmospheric pressure minus vacuum pressure.
CWhen the absolute pressure reaches 23,000 microns (29.01 inches of mercury),
perform the following:
SClose manifold gauge valves.
SClose valve on vacuum pump.
STurn off vacuum pump.
SDisconnect manifold gauge center port hose from vacuum pump.
SAttach manifold center port hose to a nitrogen cylinder with pressure
regulator set to 150 psig (1034 kPa) and purge the hose.
SOpen manifold gauge valves to break the vacuum in the line set and indoor
unit.
SClose manifold gauge valves.
DShut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the nitrogen
from the line set and indoor unit.
EReconnect 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.
FWhen the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to a
cylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line
set and indoor unit.
GPerform the following:
SClose manifold gauge valves.
SShut off HFC-410A cylinder.
SReinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
SReplace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a turn as illustrated.
OUTDOOR
UNIT
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MICRON
GAUGE
VACUUM PUMP
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 available micron gauge 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.
HIGH
LOW
1
2
3
4
5
6
7
8
9
10
11 12
1/6 TURN
NITROGEN
3CONNECT GAUGE SET
A
B
C
D
4EVACUATE THE SYSTEM
NOTE — Remove cores from service valves (if not already done).
Possible equipment damage.
Avoid deep vacuum operation. Do not use
compressors to evacuate a system.
Extremely low vacuum can cause internal
arcing and compressor failure. Damage
caused by deep vacuum operation will
void warranty.
WARNING !
NOTE - Position can
ister to deliver liquid
refrigerant.
EVACUATION
FIGURE 10