Lennox LIAC024-180P431, LIAC048-180P431, LIAC036-180P431, LIAC060-180P431 Installation Manual
Split Air Conditioner
INSTALLATION MANUAL
LENNOX AIR CONDITIONERS
MODEL:
LIAC024-180P431
LIAC036-180P431
LIAC048-180P431
LIAC060-180P431
Thank you for selecting LENNOX air conditioners.Please read this
manual carefully before operation and keep it for further reference.
Table of Contents
Section 1. Safety............................................................................2
Section 2. Unit Location Considerations.....................................3
Section 3. Unit Preparation...........................................................5
Section 4. Setting the Unit............................................................5
Section 5. Refrigerant Line Considerations................................6
Section 6. Refrigerant Line Routing.............................................7
Section 7. Refrigerant Line Brazing.............................................8
Section 8. Refrigerant Line Leak Check....................................10
Section 9. Evacuation..................................................................11
Section 10. Service Valves..........................................................11
Section 11. Electrical - Low Voltage...........................................12
Section 12. Electrical - High Voltage..........................................14
Section 13. Start Up.....................................................................15
Section 14. System Charge Adjustment....................................16
Section 15. System operation and Troubleshooting.................20
NOTE: Appearance of unit may vary.
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information
pack upon completion of work.
These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with the installation. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s
purposes, the matter should be referred to your installing dealer or local distributor.
Note : The manufacturer recommends installing only approved matched indoor and outdoor systems. All of the manufacturer’s split systems are A.H.R.I. rated only with TXV indoor systems. Some of the benefits of installing approved matched
indoor and outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.
1
Section 1. Safety
Important - This document contains a wiring diagram
and service information. This is customer property and is
to remain with this unit. Please return to service information pack upon completion of work.
CAUTION
This information is intended for use by individuals
possessing adequate backgrounds of electrical and
mechanical experience. Any attempt to repair a central air
conditioning product may result in personal injury and/or
property damage. The manufacturer or seller cannot be
responsible for the interpretation of this information, nor
can it assume any liability in connection with its use.
WARNING
HAZARDOUS VOLTAGE!
Failure to follow this warning could result in property
damage, severe personal injury, or death.
Disconnect all electric power, Including remote disconnects
before servicing. Follow proper lockout/tagout procedures
to ensure the power cannot be inadvertently energized.
CAUTION
CONTAINS REFRIGERANT!
Failure to follow proper procedures can result in
personal illness or injury or severe equipment
damage.
System contains oil and refrigerant under high
pressure. Recover refrigerant to relieve pressure
before opening system.
CAUTION
GROUNDING REQUIRED!
Failure to inspect or use proper service tools may
result in equipment damage or personal injury.
Reconnect all grounding devices. All parts of this
product that are capable of conducting electrical
current are grounded. if grounding wires, screws,
straps, clips, nuts, or washers used to complete a
path to ground are removed for service, they must be
returned to their original position and properly
fastened.
WARNING
REFRIGERANT OIL!
Any attempt to repair a central air conditioning product
may result in property damage, severe personal injury,
or death.
These units use R-410A refrigerant which operates at
50 to 7o% higher pressures than R-22. Use only
R-410A approved service equipment. Refrigerant
cylinders are painted a “Rose” color to indicate the type
of refrigerant and may contain a “dip” tube to allow for
charging of liquid refrigerant into the system. All R-410A
systems with variable speed compressors use a PVE
oil that readily absorbs moisture from the atmosphere
To limit this ‘hygroscopic“ action. the system should
remain sealed whenever possible. If a system has been
open to the atmosphere for more than 4 hours, the
compressor oil must be replaced. Never break a
vacuum with air and always change the driers when
opening the system for component replacement.
CAUTION
HOT SURFACE!
May cause minor to severe burning. Failure to follow this
Caution could result in property damage or personal injury.
Do not touch top of compressor.
WARNING
SERVICE VALVES!
Failure to follow this warning will result in abrupt
release of system charge and may result in personal
injury and/or property damage. Extreme caution
should be exercised when opening the Liquid Line
Service valve. Turn valve stem counterclockwise only
until the stem contacts the rolled edge. No torque is
required.
WARNING
BRAZING REQUIRED!
Failure to inspect lines or use proper service tools
may result in equipment damage or personal injury.
if using existing refrigerant lines make certain that all
joints are brazed, not soldered.
WARNING
HIGH LEAKAGE CURRENT!
Failure to follow this warning could result in property
damage, severe personal injury, or death.
Earth connection essential before connecting
electrical supply.
2
Section 2. Unit Location Considerations
2.1 Unit Dimensions
Unit Dimensions
Models H x W x L(Inches)
24/36
48/60
The unit’s weight values is on the carton box.
When mounting the outdoor unit on a roof, be
sure the roof will support the unit’s weight.
Properly selected isolation is recommended to
prevent sound or vibration transmission to the
building structure.
2.2 Refrigerant Piping Limits
Maximum line length = 100 feet.
Maximum vertical length = 50 feet.
Compressor crankcase heat is required for line
lengths over 50 feet.
Use only the line diameters indicated in Table
5.1.
Such as the connecting tube is more than 60 feet,
does not use large Suction line than recommend.
24-15/16 x 29-1/8 x 29-1/8
33-3/16 x 29-1/8 x 29-1/8
Standard Line
Set 100 ’ Max
Line Length
50’ Max
Line Lift
3
2.4 Location Restrictions
Ensure the top discharge area is unrestricted for
at least 60 inches above the unit.
Clearance must be provided in front of the
control box (access panels) and any other side
requiring service.
Do not locate close to bedrooms, operational
sounds may be objectionable.
Position the outdoor unit a minimum of 20 inches from
any wall or surrounding shrubbery to ensure
adequate airflow.
Outdoor unit location must be far enough away
from any structure to prevent excess roof runoff
water from pouring directly on the unit.
Av oid Install
Near Bedroom s
Min. 20” to
Shrubber y
Min. 60” Unrestricted
Min. 36”
Unrestricted
Access Panel
Cold Climate Considerations (Heat Pump Only)
Note: It is recommended that these precautions be
taken for units being installed in areas where snow
accumulation and prolonged below-freezing
temperatures occur.
• Units should be elevated 3-12 inches above the pad
or rooftop, depending on local weather. This additional height will allow drainage of snow and ice
melted durIng defrost cycle prior to its refreezlng.
Ensure that drain holes in unit base pan are not
obstructed, preventing drainage of defrost water.
• If possible, avoid locations that are likely to accumulate snow drifts. if not possible, a snow drift barrier
should be installed around the unit to prevent a
build-up of snow on the sides of the unit.
Min. 20” to
Shrubber y
Min 12"
Snow
barrier
Min. 36” to
Shrubber
Access Panel
Snow legs
3- 12" Elevation
pad
4
Section 3. Unit Preparation
3.1 Prepare The Unit For Installation
STEP 1 - Check for damage and report promptly to
the carrier any damage found to the unit.
The charge port can be used to check to be sure
the refrigerant charge has been retained during
shipment.
Section 4. Setting the Unit
4.1 Pad Installation
When installing the unit on a support pad, such as a
concrete slab, consider the following:
The pad should be at least 1-2” larger than the unit
on all sides.
The pad must be separate from any structure.
The pad must be level.
The pad should be high enough above grade to
allow for drainage.
The pad location must comply with National, State,
and Local codes.
IMPORTANT NOTE:
These instructions are intended to provide a method to tie-down system to cement slab as a securing procedure
for high wind areas. It is recommended to check Local Codes for tie-down methods and protocols.
#7 X 3/8” Self Tapping Screws
(Don’t Exceed 3/8” long)
The dimension see
Unit Dimensions.
DETAIL A
1/4” Χ 1-1/2” Hex Washer Head Concrete Screws
(3/16” Pilot Hole Needed. Pilot Hole Should Be1/4” Deeper
Than The Fastener Embedment)
5
SEE DETAIL A
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
Line Sizes Service Valve Connection Sizes
Model
24/36
48/60
5.2 Required Refrigerant Line Length
Determine required line length.
Suction
Line
3/4 3/8 3/4 3/8
7/8 7/8
Liquid
Line
3/8 3/8
Suction Line
Connection
Liquid Line
Connection
5.3 Refrigerant Line Insulation
Important: The Suction Line must always be
insulated. DO NOT allow the Liquid Line and
Suction Line to come in direct (metal to metal)
contact.
Liquid Line
Suction Line
Insulation
6
5.4 Reuse Existing Refrigerant Lines
If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
For retrofit applications, where the existing refrigerant
lines will be used, the following precautions should
be taken:
Ensure that the refrigerant lines are the correct
size. Refer to Section 2.2 listed and Table 5.1.
Ensure that the refrigerant lines are free of leaks,
acid, and oil.
Note: The manufacturer recommends installing only
approved matched indoor and outdoor systems. All
of the manufacturer’s split systems are A.H.R.I. rated
only with TXV indoor systems. Some of the benefits
of installing approved matched indoor and outdoor
split systems are maximum efficiency, optimum per formance and the best overall system reliability.
Section 6. Refrigerant Line Routing
6.1 Precautions
Important: Take precautions to prevent noise within
the building structure due to vibration transmission
from the refrigerant lines.
For Example:
When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers.
Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
Isolate the lines from all ductwork.
Minimize the number of 90º turns.
8 Feet Maximum
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
Joist/Rafter
Isolator
Side View
8 Feet Maximum
Secure Suction line from joists using isolators every 8 ft. Secure
Liquid Line directly to Suction line using tape, wire, or other
appropriate method every 8 ft.
Isolation From Joist/Rafter
7
Line Set
8 Feet Maximum
Wall
Isolator
Wall
Side View
8 Feet Maximum
Line Set
Secure Suction Line using isolators every 8 ft. Secure Liquid Line
directly to Suction Line using tape, wire, or other appropriate
method every 8 ft.
Isolation In Wall Spaces
Sealant
Ductwork
Insulation
Suction Line
Isolator
Line Set
Isolation Through Wall
Section 7. Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines
STEP 1 - Remove caps or plugs. Use a deburing
tool to debur the pipe ends. Clean both internal and
external surfaces of the tubing using an emery cloth.
DO NOT hang line sets from ductwork
8
STEP 2 - Remove the pressure tap cap
from both service valves.
STEP 3 - Purge the refrigerant lines and indoor coil
with dry nitrogen.
This pipe must have a thimble
STEP 4 Wrap a wet rag around the valve body to
avoid heat damage and continue the dry nitrogen
purge.
Braze the refrigerant lines to the service valves.
Check liquid line filter drier’s directional flow arrow to
confirm correct direction of refrigeration flow (away
from outdoor unit and toward evaporator coil) as il
lustrated. Braze the filter drier to the Liquid Line.
Continue the dry nitrogen purge. Do not remove the
wet rag until all brazing is completed.
Important: Remove the wet rag before stopping the
dry nitrogen purge.
Note: Install drier in Liquid Line.
9
STEP 5 - Replace the pressure tap
150 PSI G
caps after the service valves have cooled.
Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks
STEP 1 Pressurize the refrigerant lines and evapo
rator coil to 150 PSIG using dry nitrogen.
STEP 2 Check for leaks by using a soapy solution
or bubbles at each brazed location.
10
REQUIRED PARTS LIST
Section 9. Evacuation
9.1 Evacuate the Refrigerant Lines and Indoor Coil
Important: Do not open the service valves until
the refrigerant lines and indoor coil leak check and
evacuation are complete.
STEP 1 Evacuate until the micron gauge reads no
higher than 350 microns, then close the valve to
the vacuum pump.
STEP 2 Observe the micron gauge. Evacuation is
complete if the micron gauge does not rise above
500 microns in one (1) minute.
0350
Micr ons
ON
OFF
Once evacuation is complete blank off the vacuum
pump and micron gauge, and close the valves on the
manifold gauge set.
Section 10. Service Valves
10.1 Open the Service Valves
Extreme caution should be exercised when opening
the Liquid Line Service Valve. Turn counterclock
wise until the valve stem just touches the rolled
edge. No torque is required. Failure to follow this
warning will result in abrupt release of system
charge and may result in personal injury and /or
property damage.
Important: Leak check and evacuation must be com
pleted before opening the service valves.
Important: The Suction Service Valve must be opened
first BEFORE opening the Liquid Service Valve!
STEP 1 - Remove service valve cap.
Cap
Unit Side
of Service
Valve
1 MIN.
5/16” Hex Wrench
or Suction Service Valve
f
3/16” Hex Wrench
f
or Liquid Service Valve
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
STEP 2 - Fully insert hex wrench into the stem
and back out counterclockwise until valve stem just
touches the rolled edge (approximately five (5) turns.)
STEP 3 - Replace the valve stem cap to prevent
leaks. Tighten finger tight plus an additional 1/6 turn.
STEP 4 - Repeat STEPS 1 - 3 for Liquid Service
Valve.
Service Port
11
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