LG LVN180HV4 User manual

VERTICAL AIR HANDLING UNIT
DOWNFLOW CONVERSION KIT
INSTALLATION MANUAL
LVN360HV4
LVN420HV
LVN480HV
Kit: PNDFK0
for 36–48 MBH
LVN180HV4
LVN240HV4
Kit: PNDFJ0
for 18–24 MBH

The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or
other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the
symbols described below.
Do not throw away, destroy, or lose this manual.
Please read carefully and store in a safe place for future reference.
Content familiarity required for proper installation.
A summary list of safety precautions begins on page 3.
For more technical materials such as submittals, engineering
databooks, and catalogs, visit www.lghvac.com.
For continual product development, LG Electronics U.S.A., Inc., reserves the right to change specifications without notice.
©LG Electronics U.S.A., Inc.
This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.
PROPRIETARY DATA NOTICE
This document, as well as all reports, illustrations, data, information, and
other materials are the property of LG Electronics U.S.A., Inc., and are
disclosed by LG Electronics U.S.A., Inc., only in confidence.
This document is for design purposes only.
IM_VAHU_Downflow_12_17

3
Safety Instructions
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-
rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described
below.
TABLE OF SYMBOLS
Do not install or remove the unit by yourself (end user).
Ask the dealer or an LG trained service provider to install the
unit.
Improper installation by the user may result in water leakage, re,
explosion, electric shock, physical injury or death.
For replacement of an installed unit, always contact an LG
trained service provider.
There is risk of re, electric shock, explosion, and physical injury or
death.
The unit is shipped with refrigerant and the service valves
closed. Do not open service valves on the unit until all
non-condensibles have been removed from the piping sys-
tem and authorization to do so has been obtained from the
commissioning agent.
There is a risk of physical injury or death.
Do not operate the compressor with the service valves
closed.
There is a risk of explosion, physical injury, or death.
Periodically check that the outdoor frame is not damaged.
There is a risk of explosion, physical injury, or death.
Conrm all control box and panel covers are secure and
intact.
If cover panels are not installed securely, dust, water and animals may
enter the unit, causing re, electric shock, and physical injury or death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Exposure to high concentration levels of refrigerant gas may lead to
illness or death.
Wear protective gloves and safety goggles when handling
equipment. Sharp edges may cause personal injury.
Dispose the packing materials safely.
• Packing materials, such as nails and other metal or wooden parts,
may cause puncture wounds or other injuries.
• Tear apart and throw away plastic packaging bags so that children
may not play with them and risk suffocation and death.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation may cause the unit to fall over, resulting in physical
injury or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection device is
shorted and forced to operate improperly, or parts other than those
specied by LG are used, there is risk of re, electric shock, explosion,
and physical injury or death.
Do not install the unit on a defective stand.
There is a risk of physical injury.
INSTALLATION
Don’t store or use ammable gas / combustibles near the unit.
There is risk of re, explosion, and physical injury or death.
This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
This symbol indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action that must not be completed.
DANGER

4
Single Zone Vertical Air Handling Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
INSTALLATION - CONTINUED
Don’t install the unit where it’s directly exposed to ocean
winds.
Ocean winds may cause corrosion, particularly on the condenser and
evaporator ns, which, in turn could cause product malfunction or inef-
cient performance.
When installing the unit in a low-lying area, or a location that
is not level, use a raised concrete pad or concrete blocks to
provide a solid, level foundation.
This may prevent water damage and reduce abnormal vibration.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that
may drip and cause a slippery surface condition and/or water damage to
walls.
When installing the unit in a hospital, mechanical room, or
similar electromagnetic eld (EMF) sensitive environment,
provide sufcient protection against electrical noise.
Inverter equipment, power generators, high-frequency medical equip-
ment, or radio communication equipment may cause the air conditioner to
operate improperly. The unit may also affect such equipment by creating
electrical noise that disturbs medical treatment or image broadcasting.
Do not use the product for special purposes such as
preserving foods, works of art, wine coolers, or other
precision air conditioning applications. The equipment is
designed to provide comfort cooling and heating.
There is risk of property damage.
Do not make refrigerant substitutions. Use R410A only.
If a different refrigerant is used, or air mixes with original refrigerant, the
unit will malfunction and be damaged.
Keep the unit upright during installation to avoid vibration or
water leakage.
Do not install the unit in a noise sensitive area.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
Improper piping may cause refrigerant leaks and system malfunction.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant
according to applicable U.S. Environmental Protection
Agency (EPA) rules.
Periodically check that the outdoor frame is not damaged.
There is a risk of equipment damage.
Install the unit in a safe location where nobody can step on or
fall onto it. Do not install the unit on a defective stand.
There is risk of unit and property damage.
Install the drain hose to ensure adequate drainage.
There is a risk of water leakage and property damage.
Don’t store or use ammable gas / combustibles near the
unit.
There is risk of product failure.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels may cause product failure.
The unit is shipped with refrigerant and the service valves
closed. Do not open service valves on the unit until all
non-condensibles have been removed from the piping system
and authorization to do so has been obtained from the com-
missioning agent.
There is a risk of refrigerant contamination, refrigerant loss and equip-
ment damage.
Do not run the compressor with the service valves closed.
There is a risk of equipment damage.
Be very careful when transporting the product.
• Do not attempt to carry the product without assistance.
• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.
• Suspend the unit from the base at specified positions.
• Support the unit a minimum of four points to avoid slippage from rigging apparatus.
If the air conditioner is installed in a small space, take
measures to prevent the refrigerant concentration from
exceeding safety limits in the event of a refrigerant leak.
Consult the latest edition of ASHRAE (American Society of Heating,
Refrigerating, and Air Conditioning Engineers) Standard 15. If the
refrigerant leaks and safety limits are exceeded, it could result in person-
al injuries or death from oxygen depletion.
Install the unit in a safe location where nobody can step on or
fall onto it.
There is risk of physical injury or death.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate
that could drip, causing a slippery surface that creates a risk of slipping,
falling, and personal injury.

5
Safety Instructions
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
High voltage electricity is required to operate this system.
Adhere to the National Electrical Codes and these
instructions when wiring.
Improper connections and inadequate grounding can cause accidental
injury or death.
Always ground the unit following local, state, and National
Electrical Codes.
Turn the power off at the nearest disconnect before servicing
the equipment.
Electrical shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
There is risk of re, electric shock, explosion, physical injury or death.
WIRING
The information contained in this manual is intended for use
by an industry-qualied, experienced, certied electrician
familiar with the U.S. National Electric Code (NEC) who is
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 or
death.
All electric work must be performed by a licensed electrician
and conform to local building codes or, in the absence of
local codes, with the National Electrical Code, and the
instructions given in this manual.
If the power source capacity is inadequate or the electric work is not
performed properly, it may result in re, electric shock, physical injury or
death.
Refer to local, state, and federal codes, and use power wires
of sufcient current capacity and rating.
Wires that are too small may generate heat and cause a re.
Secure all eld wiring connections with appropriate wire
strain relief.
Improperly securing wires will create undue stress on equipment power
lugs. Inadequate connections may generate heat, cause a re and
physical injury or death.

6
Single Zone Vertical Air Handling Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
Clean up the site after installation is nished, and check
that no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use this equipment in mission critical or special-
purpose applications such as preserving foods, works of art,
wine coolers or refrigeration. The equipment is designed to
provide comfort cooling and heating.
Oil, steam, sulfuric smoke, etc., can signicantly reduce the performance
of the unit, or damage its parts.
Do not block the inlet or outlet.
Unit may malfunction.
Securely attach the electrical part cover to the indoor unit
and the service panel to the outdoor unit.
Non-secured covers can result in malfunction due to dust or water in the
service panel.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause property damage
or product failure.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure.
OPERATION
Do not provide power to or operate the unit if it is ood-
ed or submerged.
There is risk of re, electric shock, physical injury or death.
Use a dedicated power source for this product.
There is risk of re, electric shock, physical injury or death.
Do not operate the disconnect switch with wet hands.
There is risk of re, electric shock, physical injury or death.
If gas leaks out, ventilate the area before operating the unit.
If the unit is mounted in an enclosed, low-lying, or poorly ventilated area,
and the system develops a refrigerant leak, it may cause re, electric
shock, explosion, physical injury, or death.
To avoid physical injury, use caution when cleaning or servicing the air conditioner.
Do not allow water, dirt, or animals to enter the unit.
There is risk of re, electric shock, physical injury or death.
Avoid excessive cooling and periodically perform ventilation
to the unit.
Inadequate ventilation is a health hazard.
Do not touch the refrigerant piping during or after
operation.
It can cause burns or frostbite.
Do not operate the unit with the panel(s) or protective
cover(s) removed; keep ngers and clothing away from
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause physical injury or
death.
Periodically check power wiring for damage.
Power wiring must be replaced by the manufacturer, its service agent, or
similar qualied persons in order to avoid physical injury and/or electric
shock.
Do not open the inlet grille of the unit during operation.
Do not operate the unit with the panels or guards re-
moved. Do not insert hands or other objects through the
inlet or outlet when the unit has power applied to it. Do
not touch the electrostatic lter, if the unit includes one.
The unit contains sharp, rotating, hot, and high voltage parts that can
cause personal injury and/or electric shock.
Securely attach the electrical part cover to the indoor unit
and the service panel to the outdoor unit.
Non-secured covers can result in burns or electric shock due to dust or
water in the service panel.

7
Installation
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
VAHU DOWNFLOW CONVERSION KIT
Configuring the VAHU for Vertical Downflow Installation
The 4-way Vertical Air Handling Unit (VAHU) is factory ready for vertical up or horizontal left installation. Vertical down installation
requires field reconfiguration of the indoor unit. For vertical down, the downflow conversion kit is required.
There are two downflow kits available for the two VAHU chassis sizes. Use the correct conversion kit for your VAHU. Refer to Table
1 for VAHU and conversion kit compatibility.
Figure 1 shows the major components of the conversion kit.
Figure 1: VAHU Downow Kit Major Components.
Panel
Brackets
Table 1: VAHU Indoor Unit and Downow Conversion Kit Compatibility
VAHU Model Capacity (MBH) Chassis Vertical Downow
Conversion Kit
LVN180HV4 18 NJ PNDFJ0
LVN240HV4 24 NJ PNDFJ0
LVN360HV4 36 NK PNDFK0
LVN420HV 42 NK PNDFK0
LVN480HV 48 NK PNDFK0

8
Vertical Air Handling Unit Downow Conversion Kit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
VAHU DOWNFLOW CONVERSION KIT
Configuring the VAHU for Vertical Downflow Installation
Follow this procedure to convert the VAHU factory configuration to downflow configuration. This proce-
dure applies to the VAHU indoor units listed in Table 1.
1. Locate the appropriate downflow conversion kit for your VAHU. Refer to Table 1.
2. Remove VAHU front panels and supports. Retain all except bottom front panel. Bottom front panel
is replaced by a panel in the kit (Figure 2).
3. Remove pipe in and out sensors and temporarily store in the blower section (Figure 3).
4. Carefully slide the evaporator coil/drain pan assembly out of the cabinet (Figure 4). Do not
apply excessive force on the piping as it may result in refrigerant leaks.
5. Remove the horizontal drain pan from the assembly. Field scrap the drain pan.
6. Rotate the VAHU cabinet 180º (Figure 5).
Figure 2: Remove Front Panels and Supports.
Field scrap panel
Pipe In/Out
Sensors and
Wiring
Figure 3: Sensors and Wiring.
Horizontal
Drain Pan
Figure 4: Evaporator Coil/ Drain Pan Assembly. Figure 5: Rotate Cabinet.
Rotated
180°

9
Installation
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
VAHU DOWNFLOW CONVERSION KIT
Figure 6: Vertical Brackets.
Vertical
Bracket
Rear
Bracket
Side
Brackets
Front
Bracket
Figure 7: Horizontal Brackets.
Figure 8: Route Wiring.
Sensor
Wiring
Figure 9: Reinstall Coil Assembly.
Evaporator
Coil/Drain
Pan Assembly
Vertical Downflow Installation - continued
7. Install the conversion kit left and right rear vertical brackets in the rear corners of the cabinet (Figure 6).
8. Position the rear horizontal bracket on the two vertical brackets and secure with screws (Figure 7).
9. Position the left and right horizontal side brackets and secure with screws (Figure 7). The brackets are not left/right hand
dependent.
10. Position the front horizontal bracket and secure with screws (Figure 7).
11.Confirm all bracket screws are secure and the bracket assembly is correctly positioned to support the evaporator coil/drain
pan assembly.
12. Route the wiring for the pipe in and pipe out sensors (Figure 8).
13. Carefully slide the evaporator coil/drain pan assembly back into the cabinet (Figure 9). Confirm the
assembly is against the rear panel of the cabinet.

10
Vertical Air Handling Unit Downow Conversion Kit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
VAHU DOWNFLOW CONVERSION KIT
Figure 10: Reinstall Support Bracket.
Cabinet
Support
Bracket
Figure 11: Wiring Ring.
Plastic
Ring
Figure 12: Pipe Support Bracket.
Pipe
Support
Bracket
Figure 13: Reinstall Sensors.
Sensors
Figure 14: Reinstall Panels.
New
panel
Vertical Downflow Installation - continued
14. Reinstall the cabinet support bracket ( Figure 10).
15. Reinstall the plastic wiring ring and route the sensor wires
through the ring ( Figure 11).
16. Reinstall the refrigerant pipe support bracket (Figure 12).
17. Reinstall the pipe in and pipe out sensors ( Figure 13).
18. Reinstall all front panels. Be sure to use the front panel included
in the downflow kit (Figure 14).

For further technical materials such as submittals, engineering
manuals, service manuals, and catalogs, visit www.lghvac.com.

LG Electronics, U.S.A., Inc.
Commercial Air Conditioning Division
4300 North Point Parkway
Alpharetta, Georgia 30022
www.lg-vrf.com IM_VAHU_Downflow_12_17
LG Customer Information Center, Commercial Products
1-888-865-3026 USA
Follow the prompts for commercial A/C products.