LG PRHR042 INSTALLATION MANUAL
P/NO : MFL32987316
INSTALLATION MANUAL
Original instruction
AIR
CONDITIONER
www.lg.com
Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring
standards by authorized personnel only.
Please retain this installation manual for future reference after reading it
thoroughly.
ENGLISH
ESPAÑOL
• Do not cool excessively indoors. This may be harmful for your health and may consume more
electricity.
• Block sunlight with blinds or curtains while you are operating the air conditioner.
• Keep doors or windows closed tightly while you are operating the air conditioner.
• Adjust the direction of the air flow vertically or horizontally to circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, in a short period of time.
• Open windows regularly for ventilation as the indoor air quality may deteriorate if the air conditioner is used for many hours.
• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the
air flow or weaken the cooling / dehumidifying functions.
For your records
Staple your receipt to this page in case you need it to prove the date of purchase or for warranty
purposes. Write the model number and the serial number here:
Model number :
Serial number :
You can find them on a label on the side of each unit.
Dealer’s name :
Date of purchase :
Here are some tips that will help you minimize the power consumption when you use the air
conditioner. You can use your air conditioner more efficiently by referring to the instructions
below:
TIPS FOR SAVING ENERGY
2
ENGLISH
TIPS FOR SAVING ENERGY
3
ENGLISH
IMPORTANT!
Please read this instruction sheet completely before installing the product.
This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of
your job to install or service the system so it operates safely and efficiently.
WARNING
• Installation or repairs made by unqualified persons can result in hazards to you and others.
Installation of all field wiring and components MUST conform with local building codes or, in the absence of local codes, with the
National Electrical Code 70 and the National Building Construction and Safety Code or Canadian Electrical code and National
Building Code of Canada.
• The information contained in the manual is intended for use by a qualified service technician familiar with safety procedures and
equipped with the proper tools and test instruments.
• Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property damage, personal
injury and/or death.
CAUTION :
Safety Precautions
NOTE TO INSTALLING DEALER :
Improper installation, adjustment, alteration, service or maintenance can void the warranty.
The weight of the condensing unit requires caution and proper handling procedures when lifting or moving to avoid
personal injury. Use care to avoid contact with sharp or pointed edges.
• Always wear safety eye wear and work gloves when installing equipment.
• Never assume electrical power is disconnected. Check with meter and equipment.
• Keep hands out of fan areas when power is connected to equipment.
• R-410A causes frostbite burns.
• R-410A is toxic when burned.
The Owners Instructions and Warranty are to be given to the owner or prominently displayed near the
indoor Furnace/Air Handler Unit.
When wiring:
Electrical shock can cause severe personal injury or death. Only a qualified, experienced electrician should attempt to
wire this system.
• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when
wiring. Improper connections and inadequate grounding can cause accidental injury or death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.
• The choice of materials and installations must comply with the applicable local/national or international standards.
WARNING
When transporting:
Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your finger.
When installing...
... in a wall: Make sure the wall is strong enough to hold the unit's weight.
It may be necessary to construct a strong wood or metal frame to provide added support.
... in a room: Properly insulate any tubing run inside a room to prevent "sweating" that can cause dripping and water
damage to wall and floors.
... in moist or uneven locatinons: Use a raised concrete pad or concrete blocks provide a solid, level foundation for the
outdoor unit. This prevents water damage and abnormal vibration.
... in an area with high winds: Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air
baffle.
... in a snowy area(for Heat Pump Model): Install the outdoor unit on a raised platform that is higher than drifting snow.
Provide snow vents.
When connecting refrigerant tubing
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Check carefully for leaks before starting the test run.
When servicing
• Turn the power OFF at the main power box(mains) before opening the unit to check or repair electrical parts and
wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside
the unit being serviced.
4
IMPORTANT SAFETY INSTRUCTIONS
ENGLISH
IMPORTANT SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE
USING THE APPLIANCE.
Always comply with the following precautions to avoid
dangerous situations and ensure peak performance of
your product
WARNING
It can result in serious injury or death when the directions are ignored
CAUTION
It can result in minor injury or product damage when
the directions are ignored
WARNING
• Installation or repairs made by unqualified persons
can result in hazards to you and others.
• The information contained in the manual is intended for use by a qualified service technician familiar with safety procedures and equipped with
the proper tools and test instruments.
• Failure to carefully read and follow all instructions
in this manual can result in equipment malfunction,
property damage, personal injury and/or death.
WARNING
• Have all electric work done by a licensed electrician according to "Electric Facility Engineering
Standard" and "Interior Wire Regulations" and the
instructions given in this manual and always use a
special circuit.
- If the power source capacity is inadequate or
electric work is performed improperly, electric
shock or fire may result.
• Ask the dealer or an authorized technician to install
the HR unit.
- Improper installation by the user may result in
water leakage, electric shock, or fire.
• Always ground the product.
- There is risk of fire or electric shock.
• Make the connections securely so that the outside
force of the cable may not be applied to the terminals.
- Inadequate connection and fastening may gener-
ate heat and cause a fire.
!
!
!
!
• For re-installation of the installed product, always
contact a dealer or an Authorized Service Center.
- There is risk of fire, electric shock, explosion, or
injury.
• Do not install, remove, or re-install the unit by yourself (customer).
- There is risk of fire, electric shock, explosion, or
injury.
• Do not store or use flammable gas or combustibles near the HR Unit.
- There is risk of fire or failure of product.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Do not damage or use an unspecified power cord.
- There is risk of fire, electric shock, explosion, or
injury.
• Do not touch the power switch with wet hands.
- There is risk of fire, electric shock, explosion, or
injury.
• Securely install the cover of control box and the
panel.
- If the cover and panel are not installed securely,
dust or water may enter the HR unit and fire or
electric shock may result.
• Be cautious when unpacking and installing the
product.
- Sharp edges could cause injury. Be especially
careful of the case edges.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal
or wooden parts, may cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags
so that children may not play with them. If children play with a plastic bag which was not torn
apart, they face the risk of suffocation.
CAUTION
• Avoid a place where rain may enter since the HR unit
is for indoor.
- There is risk of property damage, failure of product,
or electric shock.
• Install the HR unit at a place in which it is not affected
by operation mode changing noise.
- Installation within cell such as meeting room etc.
may disturb business due to noise.
• Always check for gas (refrigerant) leakage after installation or repair of product.
- Low refrigerant levels may cause failure of product.
• Keep level even when installing the product.
- To avoid vibration or water leakage.
!
5
TABLE OF CONTENTS
ENGLISH
2 TIPS FOR SAVING EN-
ERGY
4 IMPORTANT SAFETY IN-
STRUCTIONS
6 FEATURES
7 INSTALLATION PART
8 INSTALLATION
8 Selection of the best location
8 Dimensional drawings
10 HR Unit Installation
12 Insulation
13 Wiring Connection
14 Setup the switch of HR Unit
19 COIL EXCHANGING
METHOD
20 JOINT METHOD OF HR
UNIT
TABLE OF CONTENTS
6
FEATURES
ENGLISH
FEATURES
Model PRHR022 PRHR032 PRHR042
Max. Connectable No. of Indoor Units 16 24 32
Max. Connectable No. of Indoor Units of a branch 8 8 8
Nominal Input
Cooling 26 40 40
Heating 26 40 40
Net. Weight
kg 15.2 17.2 19.2
lbs 33.5 37.9 42.3
Dimensions
(WxHxD)
mm 801x218x632 801x218x632 801x218x632
Inch 31.5x8.6x24.9 31.5x8.6x24.9 31.5x8.6x24.9
Casing Galvanized steel plate
Connecting
Pipes
Indoor side
Liquid Pipe [mm] Ø9.52 – Ø6.35
Gas Pipe [mm] Ø15.88 – Ø12.7
Outdoor side
Liquid [mm] Ø9.52 Ø12.7 Ø15.88
Low Pressure
[mm]
Ø22.2 Ø28.58 Ø28.58
High Pressure
[mm]
Ø19.05 Ø22.2 Ø22.2
Sound Absorbing Insulation Material Polyethylene Foam
Current
Minimum circuit Amps(MCA) 0.2
Maximum fuse Amps(MFA) 15
Power Supply 220V-240V~ 50/60 Hz
Connection Pipe
Control Box
Connection Pipe
(to outdoor unit)
(to outdoor unit)
Coil assembly, Solenoid
Connection Pipe
(to indoor unit)
7
INSTALLATION PART
ENGLISH
INSTALLATION PART
- Installation Manual
- Hanging bolts (4 x M10 or M8, Nut(8 x M10 or M8), Flat washers(8 x M10)
- Reducers
[Unit : mm]
Models
HR unit
reducer
PRHR022
PRHR032/
PRHR042
Liquid pipe
OD15.88(5/8)
Ø12.7(1/2)
OD12.7(1/2) Ø9.52(3/8)
Ø6.35(1/4)OD9.52(3/8)
Ø9.52(3/8)
Gas pipe
High pressure
OD19.05(3/4) Ø15.88(5/8)
OD12.7(1/2)
OD22.2(7/8) Ø19.05(3/4) Ø15.88(5/8)
OD15.88(5/8) Ø12.7(1/2)
Ø12.7(1/2)
Ø9.52(3/8)
Low pressure
OD22.2(7/8) Ø19.05(3/4) Ø15.88(5/8)
OD15.88(5/8) Ø12.7(1/2)
OD28.58(1-1/8) Ø22.2(7/8) Ø19.05(3/4)
OD19.05(3/4) Ø15.88(5/8)
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