Allied 4SCU23LX User manual

508380-01 Issue 2309 Page 1 of 96
SERVICE MANUAL
4SCU23LX
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
(P) 508380-01
*P508380-01*
This unit must be matched with an indoor coil as
specied with AHRI. For AHRI Certied system match-
ups and expanded ratings, visit www.AHRIdirectory.
org. Coils previously charged with HCFC-22 must be
ushed.
IMPORTANT
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
WARNING
To prevent serious injury or death:
Lock-out/tag-out before performing maintenance.
If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan
belt where applicable, and ensure all controllers
and thermostats are set to the “OFF” position before
performing maintenance.
Always keep hands, hair, clothing, jewelry, tools, etc.
away from moving parts.
WARNING
Table of Contents
Technical Specications ..............................................2
Typical Unit Parts Arrangement...................................5
General Information.....................................................8
Operating Gauge Set and Service Valves ...................8
Installation ...................................................................9
New or Replacement Line Set...................................11
Electrical - Circuit Sizing and Wire Routing...............22
Thermostat Control and Low Voltage Control Wiring 22
Outdoor Unitary Control.............................................27
Unit Operation ...........................................................28
Servicing Units Delivered Void of Charge..................31
Start-Up .....................................................................31
System Operation and Service..................................32
Unit Selection Code for Outdoor Control...................48
Conguring Unit.........................................................52
System Overview.......................................................53
Maintenance..............................................................54
Unit Wiring Diagram ..................................................55
Unit Sequence of Operation ......................................56
Component Testing....................................................59
System Refrigerant....................................................93
Charge Mode Jumper................................................93

508380-01Issue 2309Page 2 of 96
Technical Specications
MODEL NUMBER GUIDE
Refrigerant
4 = R410a
SCU
Split Condensing Unit
Nominal Seer
23
Tier
LX: Louvered Variable Capacity w/
Comfort Sync®
Minor Revision Code
Major Revision Code
1-Phase, 60 Hz
Tonnage
24, 36, 48, 60
Region Restrictions
1: Standard Model
4 SCU 23 LX 1 36 P - 51 A
UNIT DIMENSIONS (IN.)
Model
Dimensions (inch) Shipping Weight
(Lbs.)
A -
Width
B -
Depth
C -
Height
4SCU23LX124P-51A 37.75 35.75 37.50 230
4SCU23LX136P-51A 37.75 35.75 37.50 230
4SCU23LX148P-51A 37.75 35.75 43.75 300
4SCU23LX160P-51A 37.75 35.75 43.75 300
Note: Dimensions listed are unit sizes w/o packaging
Weights listed are unit weights with packaging
PHYSICAL AND ELECTRICAL DATA
Model Voltage/Hz/
Phase
Voltage
Range
Min.
Circuit
Amp.
Max.
Over
Current
Device
(amps)
Compressor Outdoor Fan Motor
Rated
Load
(amps)
Locked
Rotor
(amps)
Full
Load
(amps)
Rated
HP
Nom.
RPM
4SCU23LX124P-51A 208-230/60/1 197-253 12.6 20 8.0 14
2.6 1/3 Var.
Spd.
4SCU23LX136P-51A 208-230/60/1 197-253 19.2 30 13.3 14
4SCU23LX148P-51A 208-230/60/1 197-253 23.6 40 16.8 23
4SCU23LX160P-51A 208-230/60/1 197-253 27.4 45 19.8 23

508380-01 Issue 2309 Page 3 of 96
SOUND RATINGS
Model
Sound
Power1
(Low)
Estimated Sound Pressure (dBA)2
Sound
Power1
(High)
Estimated Sound Pressure (dBA)2
Approximate Distance3Approximate Distance3
One Meter
(3.3 feet)
Two Meters
(6.6 feet)
Three Meters
(9.8 feet)
One Meter
(3.3 feet)
Two Meters
(6.6 feet)
Three Meters
(9.8 feet)
4SCU23LX124P-51A 62 54 48 44 71 63 57 53
4SCU23LX136P-51A 62 54 48 44 75 67 61 57
4SCU23LX148P-51A 65 57 51 47 76 68 62 58
4SCU23LX160P-51A 65 57 51 47 76 68 62 58
1 Rated in accordance with AHRI standard 270 (2015)
2 Rated in accordance with AHRI standard 275 (2010)
3 Based only on distance factor; other factors may change this value such as:
Unit location (reflective surfaces adjacent to the unit)
Barrier shielding sources
Sound path/elevation
Outside noise sources
ACCESSORIES
Description Where Used Kit Number
H4TXV01 (TXV Kit) 24 1.851363
H4TXV02 (TXV Kit) 36 1.851364
H4TXV03 (TXV Kit) 48, 60 1.851365
Freezestat 3/8 tubing 93G35
Crankcase Heater All models Factory Installed
Sound Cover All models Factory Installed
Loss of Charge Kit All models Factory Installed
Comfort Sync®Thermostat All Models 1.841226
Comfort Sync®Zoning Controller All models 1.851399
Comfort Sync®Zone Sensor All Models 1.851422
Discharge Temperature Sensor All models 88K38

508380-01Issue 2309Page 4 of 96
REFRIGERATION DATA
Model
Refrig.
Charge
(oz.) *
TXV Refrigerant Line Size Outdoor Unit
Connection Indoor Unit Connection
Suction Liquid Suction Liquid Suction Liquid
4SCU23LX124P-51A 127 H4TXV01 3/4
3/8
3/4
3/8
3/4
3/8
4SCU23LX136P-51A 128 H4TXV02 7/8 7/8 7/8
4SCU23LX148P-51A 190 H4TXV03 7/8 7/8 7/8
4SCU23LX160P-51A 191 H4TXV03 1-1/8 1-1/8 7/8
* Factory charged for 15 feet of line set; adjust per installation instructions
NOTE: Refrigerant charge also varies with indoor unit; refer to refrigerant charge label
COOLING PERFORMANCE WITH DTC1
Outdoor Model
Indoor Model Cooling
Evap. Coil or Air
Handler3SEER2 EER2 AHRI Rated Capacity2
Sensible
Capacity
4SCU23LX124P-51A BCE7S24M 21.2 14.0 23,200 18,000
4SCU23LX136P-51A BCE7S36M 21.4 12.5 34,800 26,600
4SCU23LX148P-51A BCE7S48M 20.8 12.5 46,000 35,000
4SCU23LX160P-51A BCE7S60M 19.6 12.0 55,500 41,150
Note:
1 DTC = Designated tested combination
2 Certified in accordance with Unitary Air Conditioner Certification Program, which is based on AHRI Standard 210/240
3 A blower time delay relay is standard on all Allied Air Enterprises furnace and air handler products
FAN BLADE SPECS
4SCU23LX Fan Blade
Dia. #of Blades Pitch Part #
24 26" 328 100017-02
36, 48, 60 26" 320 100017-03
NOTE:
For the latest ratings, please see
www.alliedratings.com or www.AHRIdirectory.org

508380-01 Issue 2309 Page 5 of 96
Typical Unit Parts Arrangement
Figure 1. Control Panel Components
-24, -36 Units
-48, -60 Units

508380-01Issue 2309Page 6 of 96
Figure 2. Component Locations 4SCU23LX-24, -36, -48

508380-01 Issue 2309 Page 7 of 96
Figure 3. Component Locations 4SCU23LX-60 (Scroll Compressor Model)

508380-01Issue 2309Page 8 of 96
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.
CAUTION
General Information
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation.
The 4SCU23LX is a high-e󰀩ciency split system air
conditioner with all-aluminum coil, designed for use with
HFC-410A refrigerant only.
The 4SCU23LX-24, -36 and -48 feature a variable capacity
rotary compressor. The 4SCU23LX-60 model features a
variable capacity scroll compressor.
This unit must be installed with an approved indoor air
handler or coil. For AHRI Certied system match-ups and
expanded ratings, visit www.AHRIdirectory.org. These
instructions are intended as a general guide and do not
supersede local codes in any way. Consult authorities
having jurisdiction before installation.
This outdoor unit is designed for use in systems that use a
Thermal expansion valve (TXV).
NOTE: Special procedures are required for cleaning the
all-aluminum coil in this unit.
Electric shock hazard.
Can cause injury or death. Before attempting
to perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
WARNING
Operating Gauge Set and Service Valves
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.
Only use Allen wrenches of su󰀩cient 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 o󰀨 the wrench, or stripping the valve stem
recess.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and tted
snugly over the cap before tightening.
IMPORTANT
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
Table 1. Torque Requirements
Using Manifold Gauge Set
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back ttings.
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, ushing, leak testing, evacuating,
checking charge and charging. Each valve is equipped
with a service port which has a factory-installed valve stem.
Figure 4 through Figure 6 provide information on access
and operation of both angle and ball service valves.

508380-01 Issue 2309 Page 9 of 96
Figure 4.
BALL (SHOWN
CLOSED)
SERVICE PORT
CORE
TO OPEN, ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE, ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CAP
STEM CAP
VALVE
STEM
1 -Remove stem cap with an appropriately sized wrench.
2 -Use an appropriately sized wrench to open. To open valve, rotate
stem counterclockwise 90°. To close, rotate stem clockwise 90°.
OPERATING BALL-TYPE SERVICE VALVE
Figure 5.
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
SERVICE PORT CORE
SERVICE PORT CAP
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
STEM CAP
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
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.
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.
NOTE -A label with specific torque requirements may be affixed to
the stem cap. If the label is present, use the specified torque.
OPERATING ANGLE-TYPE SERVICE VALVE
Figure 6.
12
3
4
5
6
7
8
9
10
11 12
1/12 TURN
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 2.
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
11 12
1/6 TURN
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 2.
Without torque wrench, fi
en and use an appropriately sized
wrench to turn an additional 1/12
turn clockwise.
ACCESS SERVICE PORT
Installation
NOTE: In some cases, noise in the living area has been
traced to gas pulsations from improper installation of
equipment.
• Locate unit away from windows, patios, decks, etc.
where unit operation sounds may disturb customer.
• Leave some slack between structure and unit to
absorb vibration.
• Place a sound-absorbing material, such as Isomode,
under the unit if it will be installed in a location or
position that will transmit sound or vibration to the
living area or adjacent buildings.
• Install the unit high enough above the ground or roof to
allow adequate drainage of defrost water and prevent
ice buildup.
• In heavy snow areas, do not locate the unit where
drifting snow will occur. The unit base should be
elevated above the depth of average snows.
NOTE: Elevation of the unit may be accomplished
by constructing a frame using suitable materials. If a
support frame is constructed, it must not block drain
holes in unit base.
• When installed in areas where low ambient
temperatures exist, locate unit so winter prevailing
winds do not blow directly into outdoor coil.
• Locate unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil
or into unit.

508380-01Issue 2309Page 10 of 96
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.
WARNING
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.
IMPORTANT
When outdoor unit is connected to factory-approved indoor
unit, outdoor unit contains system refrigerant charge for
operation with matching indoor unit when connected by 15
ft. of eld-supplied tubing. For proper unit operation, check
refrigerant charge using charging information located on
control box cover.
PLACEMENT
TWO 90° ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION.
INSTALL UNIT AWAY FROM WINDOWS.
Figure 7.
Outdoor Section
Zoning ordinances may govern the minimum distance the
condensing unit can be installed from the property line.
Discharge Air
Mounting Slab
Ground Level
Building
Structure
Mounting slab must slope slightly away from
building, not to exceed 1/4” per foot.
Figure 8. Slab Mounting
Install on a Solid, Level Mounting Pad
The outdoor section is to be installed on a solid foundation.
This foundation should extend a minimum of 2” (inches)
beyond the sides of the outdoor section. To reduce the
possibility of noise transmission, the foundation slab
should NOT be in contact with or be an integral part of the
building foundation. See Figure 8.
If conditions or local codes require the unit be attached to
pad or mounting frame, tie down bolts should be used and
secured to unit base pan.
Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
CAUTION
Elevate unit per local climate and code requirements to
provide clearance above estimated snowfall level and
ensure adequate drainage of unit. Use snow stand in areas
where prolonged freezing temperatures are encountered.
If conditions or local codes require the unit be attached to
pad or mounting frame, tie down bolts should be used and
fastened through knockouts provided in unit base pan.
Clearance Requirements
When installing, allow su󰀩cient space for airow clearance,
wiring, refrigerant piping, and service. For proper airow,
quiet operation and maximum e󰀩ciency. Position so water,
snow, or ice from roof or eaves cannot fall directly on unit.
Refer to Table 2 for installation clearances.

508380-01 Issue 2309 Page 11 of 96
Location Minimum Clearance
Service box 30”
Top of unit* 48”
Between units 24”
Against wall 6”
* Maximum so󰀩t overhang is 36”.
NOTE: At least one side should be unobstructed by a wall or
other barrier.
Table 2. Clearances
30” around
Control
Box
24”
6”*
Figure 9.
Note: See Table 2 for specic minimum clearance guidelines.
DO LOCATE THE UNIT:
• With proper clearances on sides and top of unit
• On a solid, level foundation or pad (unit must be level
to within ± 1/4 in./ft. per compressor manufacturer
specications)
• To minimize refrigerant line lengths
DO NOT LOCATE THE UNIT:
• On brick, concrete blocks or unstable surfaces
• Near clothes dryer exhaust vents
• Near sleeping area or near windows
• Under eaves where water, snow or ice can fall directly
on the unit
• With clearance less than 2 ft. from a second unit
• With clearance less than 4 ft. on top of unit
New or Replacement Line Set
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 ushed prior to installation. Take
care to empty all existing traps. Polyvinyl ether (PVE)
and polyol ester (POE) oils are used in Allied variable-
capacity 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 system performance and capacity.
Failure to properly ush the system per this instruction
and the detailed Installation and Service Procedures
manual will void the warranty.
IMPORTANT
Flush the existing line set per the following instructions.
For more information, refer to the Installation Instruction.
CAUTION - DO NOT attempt to ush and re-use existing
line sets or indoor coil when the system contains
contaminants (i.e., compressor burn out).
Polyvinyl ether (PVE) oil is used in the 4SCU23LX-24,
-36, and -48 with rotary compressors. For installations
of the 4SCU23LX-24, -36, and -48 units with refrigerant
lines or coils previously charged with R410A and POE
oil, Allied Air recommends ushing the existing lines and
coil with R410A refrigerant to remove excess POE oil that
may be in the system. The 4SCU23LX-60 air conditioners
have variable capacity scroll compressors that use POE
oil. 4SCU23LX-60 units with refrigerant lines or coils
previously charged with R410A and POE oil, do not need
to be ushed to remove the POE oil.
If a new line set is being installed, size the piping per Table 3.
Model
23 SEER
Liquid Line Suction Line
24 3/8 3/4
36 3/8 7/8
48 3/8 7/8
60 3/8 1-1/8
* Fittings should be supplied by the installer.
NOTE - Some applications may require a eld-provided 7/8"
to 1-1/8"adapter.
Table 3.
NOTE: Special consideration must be taken for line sets
over 50 feet. See Refrigerant Piping Guidelines.

508380-01Issue 2309Page 12 of 96
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
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 ame, can
cause re and/or an explosion, that could
result in property damage, personal injury
or death.
WARNING
Polyvinyl ether (PVE) 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.
The 4SCU23LX is a variable-capacity cooling system
utilizing variable speed compressor technology. With the
variable speed compressor and variable pumping capacity,
additional consideration must be given to refrigerant piping
sizing and application. The guidelines below are to be used
exclusively for the 4SCU23LX systems.
Cooling System (HFC410a)
• Total equivalent length equals 180 feet (piping and all
ttings included).
NOTE: Length is general guide. Lengths may be more or
less, depending on remaining system design factors.
• Maximum linear (actual) length = 150 feet.
• Maximum linear liquid lift = 60 feet.
NOTE: Maximum lifts are dependent on total length,
number of elbows, etc. that contribute to total pressure
drop.
• Maximum length vapor riser = 60 feet.
• Up to 50 Linear Feet: Use rated line sizes listed in
Table 4.
• Between 51 and 150 Linear Feet: Crankcase heater
and nonbleed port TXV factory installed. No additional
components required. Vertical vapor riser must be
sized to the vapor riser listed in Table 5 on systems
with line sets longer than 51 feet. Use Table 5 and
Table 6 to determine the correct liquid and vapor line
sizes.
• Over 150 Linear Feet: not recommended.
• Additional oil is not required for systems with line
lengths up to 150 feet.
Suction Traps
For systems with the outdoor unit 5 - 60 feet above the
indoor unit, one trap must be installed at the bottom of the
suction riser.
Tonnage * Valve Size Connections Recommended Line Sets
Liquid Line Suction Line Line Set Length
-24
3/8” (10mm)
3/4” (19mm) 30’ (9.1m)
-36 7/8” (22mm) 40’ (12.2m)
-48 50’ (15.2m)
-60 1-1/8” (29mm) ** Field-fabricated
* Applicable to all minor revision numbers unless otherwise specied.
** Some applications may require a eld-provided 1-1/8” to 7/8” adapter.
Table 4. Standard Refrigerant Line Set – Up to 50 Linear Feet in Length

508380-01 Issue 2309 Page 13 of 96
Tonnage
Maximum Total
Equivalent
Length (ft)
Maximum Linear
(actual) Length
(ft)
Maximum Vapor
Riser (ft)
Maximum Linear
Liquid Lift (ft)
Preferred Vapor
Line Sizes for
Horizontal Runs
Required Vapor
Riser Size
-24
180 150 60 60 7/8”
5/8”
-36 3/4”
-48 7/8”
-60
Table 5. 4SCU23LX Line Set Guidelines – 51 to 150 Linear Feet in Length
Tonnage Line SIze Total Linear Length (ft.)
25 50 75 100 125 150
-24 5/16" 25 50 55 48 40 33
Max Elevation (ft)
3/8” 25 50 60 60 60 60
-36 3/8” 25 50 60 56 51 45
1/2” 25 50 60 60 60 60
-48 3/8” 25 50 50 41 31 22
1/2” 25 50 60 60 60 60
-60 3/8” 25 50 36 22 8 NR
1/2” 25 50 60 60 60 59
NOTE: Shaded rows indicate rated liquid line size.
A. Find your tonnage on the left side of the table.
B. Start with the rated liquid line size (shaded row) on the outdoor tonnage.
C. Select the actual Total Linear Length of your system shown at the top of the table.
D. The elevation listed in the table is the maximum allowed for the liquid line listed.
E. Select or consider the larger liquid line size shown in the table if the elevation does not meet your requirements.
NOTE: For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4).
Table 6. Liquid Line Diameter Selection

508380-01Issue 2309Page 14 of 96
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)
INSTALLATION
LINE SET
NOTE — Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.
NON-CORROSIVE
METAL SLEEVE
IMPORTANT —Refrigerant lines must not contact structure.
NON-CORROSIVE
METAL SLEEVE
8 FEET (2.43 METERS)
IMPORTANT —Refrigerant lines must not contact wall

508380-01 Issue 2309 Page 15 of 96
It is recommended that vertical suction risers not be up-
sized. Proper oil return to the compressor should be
maintained with suction gas velocity.
Filter Drier
The lter drier is very important for proper system operation
and reliability. If the drier is shipped loose, it must be
installed by the installer in the eld. Unit warranty will be
void, if the drier is not installed.
NOTE: The suction lter drier is factory installed on -24,
-36, and -48 units. The liquid lter drier is factory installed
on -60 units.
Installation of Line Sets
DO NOT fasten liquid or suction lines in direct contact with
the oor or ceiling joist. Use an insulated or suspension
type of hanger. Keep both lines separate, and always
insulate the suction line. Liquid line runs (30 feet or more)
in an attic will require insulation. Route refrigeration line
sets to minimize length.
DO NOT let refrigerant lines come in direct contact with
foundation. When running refrigerant lines through the
foundation or wall, openings should allow for a sound
and vibration absorbing material to be placed or installed
between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be lled with
a vibration damping material.
If ANY refrigerant tubing is required to be buried by state
or local codes, provide a 6 inch vertical rise at service
valve.
CAUTION
Installation into an Existing R-22 System
If the unit will be installed in an existing system that uses
an indoor unit or line sets charged with R-22 refrigerant,
installer must perform the following procedures to convert
the system to an R-410A system.
Typical Existing Fixed Orice Removal
Procedure
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)
Figure 10. Remove Fixed Orice
(Uncased Coil Shown)
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps from the liquid line and
distributor assembly.
3. Using two wrenches (one to hold the orice housing
and one to remove the brass nut), disconnect liquid
line from liquid line orice housing. Take care not to
twist or damage distributor tubes during this process.
4. Remove and discard xed orice, valve stem assembly
(if present) and Teon®washer, as shown in Figure 10.
5. Use a eld-provided tting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orice housing.
Remove Existing Expansion Valve
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps from the liquid line and
distributor assembly.
3. Disconnect the equalizer line from the check expansion
valve equalizer line tting on the vapor line.
4. Remove the vapor line sensing bulb.
5. Disconnect the liquid line from the check expansion
valve at the liquid line assembly.
6. Disconnect the check expansion valve from the liquid
line orice housing. Take care not to twist or damage
distributor tubes during this process.
7. Remove and discard check expansion valve and the
two Teon®rings (see Figure 11).
8. Use a eld-provided tting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orice housing.

508380-01Issue 2309Page 16 of 96
SENSING
LINE
TWO-PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON®
RING
STUB END
TEFLON®
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
Figure 11. Remove Existing Expansion Valve
(uncased coil shown)
Flushing Line Sets
If the unit will be installed in an existing system that uses
an indoor unit or line sets charged with R-22 refrigerant,
installer must perform the following ushing procedure.
NOTE: Existing system components (including line set
and indoor coil) must be an AHRI match with the unit in
order to fulll unit warranty requirements.
Refrigerant must be reclaimed in accordance with
national and local codes.
WARNING
Do NOT attempt to ush and re-use existing line sets
or indoor coil when the system contains contaminants
(i.e., compressor burn out).
CAUTION
“Clean refrigerant” is any refrigerant in a system that
has not had compressor burnout. If the system has
experienced burnout, it is recommended that the
existing line set and indoor coil be replaced.
NOTE
In lieu of R-410A, an industry-standard ushing agent
may also be used.
NOTE
LOW
HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
CYLINDER CONTAINING
CLEAN R-410A TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVER
Y
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
VAPOR LINE
SER
VICE VALVE
VAPOR
LIQUID
1
A
B
C
D
ACylinder with clean R-410A (positioned to deliver liquid refrigerant) to the
vapor service valve.
BRefrigerant gauge set (low side) to the liquid line valve.
CRefrigerant gauge set center port to inlet on the recovery machine with
an empty recovery tank connected to the gauge set.
DConnect recovery tank to recovery machine per machine instructions.
Figure 12.
1. Connect gauges and equipment as shown in Figure
12.
2. Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the
existing system line set and indoor unit coil.
3. Position the cylinder of clean R-410A for delivery of
liquid refrigerant and open its valve to allow liquid
refrigerant to ow 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.
4. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so
that all of the R-410A vapor is recovered. Allow the
recovery machine to pull the system down to 0.
5. Close the valve on the inverted R-410A drum and the
gauge set valves. Pump the remaining refrigerant out
of the recovery machine and turn the machine o󰀨.

508380-01 Issue 2309 Page 17 of 96
Refrigerant Piping - Install Indoor Expansion Valve
This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at
the indoor coil. See the Product Specications for approved expansion valve kit match-ups and application information. The
check expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is
being installed in a eld-provided plenum, install the check/expansion valve in a manner that will provide access for future
eld service of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit.
1 -Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
NOTE - Though it is preferred to have the sensing bulb
installed on a horizontal run of the vapor line, installation
on a vertical run of piping is acceptable if necessary.
NOTE - Confirm proper thermal contact between vapor
line and check/expansion bulb before insulating the
sensing bulb once installed.
2 -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
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
3 -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.
4 -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.
5 -Place the remaining Te flon®washer around the other
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon®
ring with refrigerant oil.
6 -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.
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
1
2
3
4
5
6
7
8
9
10
11 12
1/2 Turn
SENSING BULB INSTALLATION
EQUALIZER LINE INSTALLATION
1
2
3
4
5
6
7
8
9
10
11 12
1/8 Turn
1 -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.
2 -Remove the field-provided
sembly.
INDOOR EXPANSION VALVE INSTALLATION

508380-01Issue 2309Page 18 of 96
Refrigerant Piping - Brazing Procedures
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND VAPOR LINE SERVICE VALVES
OUTDOOR
UNIT
LIQUID LINE
VAPOR LINE
LIQUID LINE SERVICE
VALVE
VAPOR LINE
SERVICE
VALVE
ATTACH
GAUGES
INDOOR
UNIT
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 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
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 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
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
3
VAPOR LINE SERVICE
VALVE
COPPER TUBE
STUB
REFRIGERANT LINE
REDUCER
SERVICE VALVE
CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
Use a manifold gauge set designed for use on R-410A
refrigerant systems.
NOTE
Before brazing, ensure the system is fully
recovered of all refrigerant. 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
Brazing alloys and ux 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 ux.
WARNING

508380-01 Issue 2309 Page 19 of 96
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
VAPOR LINE
WATER-SATURATED
CLOTH
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 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 Leak Test and Evacuation section of this manual.
WARNING
While protecting the
service valve seals with
water-saturated cloths,
ensure that water does
NOT enter the system.

508380-01Issue 2309Page 20 of 96
Leak Test and Evacuation
TO VAPOR
SERVICE VALVE
HFC-410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGH
LOW
1
2
A
B
NITROGEN
NOTE - Position
canister to deliver
liquid refrigerant.
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 nitrogen with a pressure regulating valve to the center port of the manifold gauge
set.
D - Adjust 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 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 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.
B - With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of
the manifold gauge set.
CONNECT GAUGE SET
TEST FOR LEAKS
NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container.
After leak testing, disconnect gauges from service ports.
NOTE - Service valve cores remain removed for the following evacuation procedure.
LEAK TEST