Lennox 4 Series User manual

LENNOX MULTI SPLIT INVERTER
AIR CONDITIONER
Installation Manual
Outdoor Unit - Series 4

213 23 50 |lennoxaus.com.au
CONTENTS
1.0. Preface 4
2.0. Safety Precautions 5
3.0. Product Introduction 7
4.0. Parts 10
5.0. Installation Instructions 11
6.0. Air Purging and Refrigerant Charge 17
7.0. Electrical Connections and Wiring 19
8.0. Troubleshooting 23
9.0. Maintenance 28
LENNOX MULTI SPLIT INVERTER
Outdoor Unit

13 23 50 |lennoxaus.com.au 3
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance by a
person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
Please read this manual carefully before operating the unit and keep it in a safe
location for future reference.
Installation or maintenance should always be conducted by an authorized dealer or
local service centre.
Only use the air conditioner as instructed in this booklet. These instructions are not
intended to cover every possible condition and situation. As with any electrical
household appliance, common sense and caution are therefore always recommended
for installation, operation and maintenance.
This marking indicates that this product should not be disposed with other household
wastes throughout Australia. To prevent possible harm to the environment or human
health from uncontrolled waste disposal recycle it responsibly to promote the
sustainable reuse of material resources. To return your used device please use the
return and collection systems or contact the retailer where the product was purchased.
They can take this product for environmentally safe recycling.
The design and specifications here within are subject to change without notice for product
improvement. Please consult with Customer Service for further details.
LENNOX MULTI SPLIT INVERTER
Outdoor Unit
Applicable to Model Numbers:
• LNMT100V4
• LNMT114V4

1.0. PREFACE
Please carefully read this manual before installation and operation. When reading this manual, please
be aware of the following key user notices:
• This unit measures based on AS/NZS 60335.2.40:2006
• For your personal safety when operating this system, always follow the instructions in the manual.
• The total capacity of the indoor units which runs at the same time cannot exceed that of the
outdoor units; otherwise the cooling (heating) peormance of each indoor unit will be aected.
Table 1: Minimum and Maximum Number of Connectable Units
Model LNMT100V4 LNMT114V4
Minimum number of connectable indoor units 2 2
Maximum number of connectable indoor units 4 5
Minimum capacity of connectable indoor units 18 18
Maximum capacity of connectable indoor units 48 51
• Switch the main power on 8 hours before starting the unit for a successful startup.
• It is a normal operation that the indoor unit fan will still run for 20~70 seconds aer the indoor unit
receives the “stop” signal to make full use of aer-heat for the next operation.
• When the running modes of the indoor and outdoor units are in conflict, this will be indicated on
the wired controller display for five seconds and then the indoor unit will stop. The unit will return
to normal operation by harmonizing their running modes: the cooling mode is compatible with the
dehumidifying mode and the fan mode can operate in all modes. If the supply power fails when
the unit is running, the indoor unit will send the “start” signal to the outdoor unit three minutes aer
power recovery.
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Outdoor Unit

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2.0. SAFETY PRECAUTIONS
2.1. Explanation of Symbols
Indicates a hazardous situation that, if not avoided, will result in death or
serious injury.
Indicates a hazardous situation that, if not avoided, could result in death
or serious injury.
Indicates a hazardous situation that, if not avoided, may result in minor
or moderate injury.
Indicates important but not hazard-related information, used to indicate
risk of property damage.
Indicates a hazard that would be assigned a signal word WARNING or
CAUTION.
2.2. Operation and Maintenance
• Follow these instructions during the installation process. Please carefully read this manual before
unit startup and service.
• Installation should only be conducted by authorized dealer or qualified personnel. Do not attempt
to install the unit by yourself.
• Improper handling may result in water leakage, electric shock or fire.
• Before installation, please check if the power supply is in accordance with the requirements
specified on the nameplate.
• Ensure local and national codes, standards and regulations are followed.
• Make sure the unit is correctly earthed prior to powering the unit to avoid electric shock.
• Do not connect the ground wire to a gas pipe, water pipe, lightning rod or telephone line.
• Only use genuine authorised accessories and parts, to minimise the risk of water leakage, electric
shock and fire accidents.
• If refrigerant leakage occurs during installation, ventilate the area immediately. Keep away from
people. Keep away from sparks and naked flames.
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit
DANGER
WARNING
CAUTION
NOTICE

6
• Ensure a correctly sized power cord is used. Never use a damaged power cord or connection wire.
The connection wire should be replaced by exclusive cable.
• Aer connecting the power cord, ensure the electric box cover is properly secured to avoid potential
accidents.
• Always comply with the nitrogen charge requirements. Charge nitrogen when welding pipes.
• Never short-circuit or cancel the pressure switch to prevent unit damage.
• Always connect the wired controller prior to supplying power to the unit.
• Prior using the unit, always conduct an inspection to ensure the piping and wiring are connected
correctly to avoid water leakage, refrigerant leakage, electric shock, or fire.
• Never insert fingers or objects into air outlet/inlet grille.
• Open doors and windows to provide good ventilation in the room to avoid oxygen deficit when the
gas/oil supplied heating equipment is used.
• Never start up or shut down the air conditioner by means of directly plug or unplug the power cord.
• Only turn o a unit if it has been running for at least five minutes; otherwise it will influence oil return
of the compressor.
• Do not allow children to operate this unit.
• Do not operate this unit with wet hands.
• Turn o the unit or cut o the power supply before cleaning the unit, otherwise electric shock or
injury may occur.
• Never spray or flush water towards unit, otherwise malfunction or electric shock may occur.
• Do not expose the unit to a moist or corrosive environment.
• Ensure the unit has been powered at least 8 hours before operation. Do not cut o the power when
24 hours short-time halting (to protect the compressor).
• Volatile liquids, such as diluent or gas will damage the unit appearance. Only use so cloth with a
little neutral detergent to clean the outer casing of the unit.
• Under cooling mode, do not set the room temperature too low and keep the temperature dierence
between the indoor and outdoor unit within 5°C.
• If the unit is operating abnormally (e.g. burning smell), power o the unit and cut o the main power
supply. Contact the authorised service centre or dealer.
• Never attempt to fix the unit yourself, as this may result in electric shock, injury or damage to the
unit. Always use an authorised service centre or dealer.
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3.0. PRODUCT INTRODUCTION
• The Lennox Multi Split Inverter Series 4 incorporates inverter compressor technology. This stepless
operation can vary the capacity within range of 15% to 120%. The multi split inverter is ideal for both
residential and commercial applications.
3.1. Name of the Main Parts
Figure 1: Outdoor Unit Model LNMT100V4 / LNMT114V4
Table 1: Parts List
Part Description
1Motor
2Fan
3 Electricity Box
4Gas Valve Assembly
5Liquid Valve Assembly
NOTICE:
• The above figures are only intended to be a simple diagram of the appliance and may not
correspond to the appearance of the units that have been purchased.
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Outdoor Unit

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3.2. Combinations for Outdoor and Indoor Units
• See Figure 2 for combinations of outdoor and indoor Units. For the Multi Split System, one outdoor
unit can be connected to up to five indoor units (wall split, cassette, or slim line ducted). The outdoor
unit will run if any one indoor unit receives the running command, and all indoor units stop once
the outdoor unit is turned o.
Figure 2: Combinations for Outdoor and Indoor Units
Table 2: Indoor Unit Energy Level and Capacity
Indoor unit Model Capacity (kW) Outdoor unit
Wall Split LNINVE025V4 2.5 LNMT100V4
LNMT114V4
LNINVE035V4 3.5
LNINVE052V4 5.2
LNINVE071V4 7.1
LNINVE085V4 8.5
Cassette LNMTCAS035V4 3.5 LNMT100V4
LNMT114V4
LNMTCAS050V4 5.0
LNMTCAS071V4 7.1
Slim Line Ducted LNMTDSS035V4 3.5
LNMTDSS050V4 5.0
LNMTDSS060V4 6.0
LNMTDSS071V4 7.1
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit
Wall Split
Indoor Unit
Cassette
Indoor Unit
Slim Line
Ducted Indoor Unit

9
3.3. Rated Working Conditions
Table 3: Rated Working Conditions
Indoor Side State Outdoor Side State
Dry Bulb Temp. °C Wet Bulb Temp. °C Dry Bulb Temp. °C Wet Bulb Temp. °C
Rated Cooling 27 19 35 24
Rated Heating 20 15 7 6
NOTICE:
• The listed cooling and heating capacity is tested before outgoing.
• The parameters are tested under rated working conditions. Referto name plate for anyamendments
to test results.
• The parameters of heating capacity of indoor unit for heat pump exclude that of auxiliary electric
heating power.
• The peormance parameters are tested according to standard AS/NZS 3823.2-2013.
3.4. Operating Temperature Ranges
Table 4: Operating Temperature Ranges
Model Mode Outdoor Temperature Range
LNMT100V4 Cooling -7°C - 48°C
Heating -15°C - 24°C
LNMT114V4 Cooling -7°C - 48°C
Heating -15°C - 30°C
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit

4.0. PARTS
NOTICE:
• Prior to installation, ensure you have the following parts listed in Table 5.
Table 5: Parts Required for Installation
Number Description Picture Quantity
2 Tube Connector Sub Assembly 6
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Outdoor Unit

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5.0. INSTALLATION INSTRUCTIONS
5.1. Installation Location
• Position the unit away from direct sunlight for optimum peormance. Install the unit in a position
away from dust and potential debris.
• Always position the unit away from combustible, flammable and corrosive gas or exhaust gas.
• Never allow children to approach the unit and take measures to prevent children touching the unit.
• Install the unit in a location that can support the weight of the unit. Ensure the unit is correctly
anchored as per national and local regulations, codes and standards.
• Allow the recommended clearances around the unit to optimize heat exchange and service access.
• Keep the indoor and outdoor units as close as possible to minimise pipe length and bends.
5.2. Outdoor Unit Clearances
• When the outdoor unit is surrounded by walls, the installation space of the unit should be allowed
as depicted in Figure 3.
Figure 3: Outdoor Unit Clearances
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit
WARNING
CAUTION

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5.3. Piping Connection
NOTICE:
• The maximum pipe length is shown in Table 6.
• Use waterproof insulating pipe.
• Wall thickness of pipe: 0.5mm - 1.0mm; bearing pressure: 3.0MPa
• The longer the connection of the pipe, the more colling and heating capacity will decrease.
• When the distance between units (piping length) is out of the range listed below, normal operation
of the unit cannot be guaranteed.
Table 6: Piping Connection
Model Connecting Pipe (mm) Maximum Pipe
Length (m)
Maximum Height Dierence between
Indoor and Outdoor Unit (m)
Liquid Gas
LNMT100V4 Φ6.35 Φ9.52 75 15m
LNMT114V4 Φ6.35 Φ9.52 75 15m
5.4. Outdoor Unit Dimensions
LNMT100V4
Figure 4: LNMT100V4 Outdoor Unit Dimensions
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit

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LNMT114V4
Figure 5: LNMT114V4 Outdoor Unit Dimensions
5.5. Installation of the Connection Pipe
• Connection piping for the indoor and outdoor units are depicted in manifold mode as per Figure 6.
Figure 6: Connection Piping (Manifold Mode)
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5.6. Piping Between Indoor and Outdoor Units
1. Ensure the liquid and gas stop valves marked A, B, C, D and E are closed if they have not been
connected to the indoor units.
2. Refer to Table 7 for the moments of torque for tightening screws.
3. Point the flare end of the copper pipe at the screw and tighten by hand.
4. Tighten using the appropriate torque wrench as shown in Table 7.
5. Use a pipe tube bender to bend the pipe. Ensure that the bend radius is not too small, otherwise
cracks may occur resulting in leakage.
6. Wrap the exposed refrigerant pipe and the joints with insulation and then tighten them with plastic
tape.
Table 7: Moments of Torque
Pipe Diameter (mm) Thickness of Copper Tube (mm) Tightening Torque (N·m)
Φ6.35 ≥0.8 mm 15 - 30
Φ9.52 ≥0.8 mm 35 - 40
Φ12.70 ≥ 0.8 mm 45 - 50
Φ15.90 ≥1.0 mm 60 - 65
• During the connection of the indoor unit and the refrigerant pipe, do not apply too much force to
the joints of the indoor unit; as this may cause the capillary pipe or other pipes to crack and result
in leakage.
• The refrigerant pipe should be supported by brackets.
• If the piping connection size of outdoor unit does not match the piping connection size of indoor
unit, use the piping connection dimension of indoor unit. And use dierent-diameter joints at the
piping connection to connect the indoor unit.
• Forthe Multi Split Inverter, each pipe should be labeled with the indoor unit details for easy reference
and to avoid incorrect piping.
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit
CAUTION
CAUTION

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5.7. Allowable Pipe Length and Drop Height Between Indoor and Outdoor Units
NOTICE:
• If the total refrigerant pipe length (liquid pipe) is smaller than that listed in the table below, no
additional refrigerant will be charged.
Table 8: Allowable Length and Drop Height of the Refrigerant Pipe
Model Total Liquid Pipe Length (a+b+c+d+e) (m)
LNMT100V4 40
LNMT114V4 40
Table 9: Allowable Length and Drip Height of the Fitting Pipe
Model Allowable Value
Total Actual
Length of
Fitting
Pipe (m)
Length of
Farthest Fitting
Pipe (m)
Height Dierence between
Outdoor Unit and Indoor Unit (m)
Height
Dierence
between
Indoor
Units (m)
Outdoor Unit
at Upper (m)
Outdoor Unit
at Lower (m)
LNMT100V4 75 25 15 15 7.5
LNMT114V4 75 25 15 15 7.5
Fitting Pipe L1+L2+…+LM
(M ≤5)
L1+L2+…+LM
(M ≤5)
H1 H3 H2
Figure 7: Height Dierences between Outdoor and Indoor Units
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5.8. Insulating the Refrigerant Pipe
• The refrigerant pipe should be insulated and taped to prevent condensation and water leakage.
• The joints of the indoor unit should be wrapped with the insulation material. Ensure there is no gap
is on the joint of the indoor unit, as shown in Figure 8.
Figure 8: Insulating the Refrigerant Pipe
• Once insulated, ensure the pipe bend radius is not too small as this may cause the pipe to crack
or break, resulting in leakage.
• Do not wrap the pipe too tightly or the insulation eect may be weakened. Additionally, make sure
the drain hose is separated from the pipe.
To wrap the pipe with tape:
1. Bind the refrigerant pipe and electric cables together with tape and separate them from the drain
pipe to prevent the condensate water ovelowing.
2. Wrap the pipe from the bottom of the outdoor unit to the top of the pipe where it enters the wall.
During the wrapping, ensure the tape will cover half of the former one.
3. Fix the wrapped pipe on the wall with clamps.
4. To finish, fill the hole in the wall with sealant to prevent wind and rain entering the room.
5.9. Support and Protection for Pipeline
1. Add additional supports for hanging connection pipe. The distance between each support must
not exceed 1m.
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Outdoor Unit
CAUTION

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6.0. AIR PURGING AND REFRIGERANT CHARGE
6.1. Air Purging
1. The outdoor unit has been pre-charged before shipment. Additional refrigerant charge may be
required during the field installation.
2. Ensure the liquid valve and the gas valve of the outdoor unit are closed fully.
3. As shown in Figure 9, expel the gas inside the indoor unit and refrigerant pipe out using vacuum
pump.
Figure 9: Expelling Gas from the Indoor Unit and Refrigerant Pipe
NOTICE:
• When the compressor is not running, charge the R410A refrigerant into the refrigerant pipe from the
liquid valve of the outdoor unit (not from the gas valve).
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Outdoor Unit

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6.2. Additional Refrigerant Charging
• Refrigerant charge is only in the outdoor unit prior to shipment.
NOTICE:
• Outdoor unit has been pre-charged with refrigerant. The refrigerant charge is not included in the
indoor unit and the refrigerant pipe.
• The amount of the additional refrigerant charge is dependent on the diameter and length of the
liquid refrigerant pipe which is determined by the actual field installation requirement.
• Record the additional refrigerant charge for future maintenance.
• Calculation of the Additional Refrigerant Charge
• (Σ Length of Liquid Pipeφ9.52×54+Σ Length of Liquid Pipeφ6.35×22)-880
• The maximum additional refrigerant charge value is 800g.
• If the calculated value exceeds 800g, the additional refrigerant charge should be 800g
• If the calculated value is less than 800g, the additional refrigerant charge is the calculated
value.
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Outdoor Unit

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7.0. ELECTRICAL CONNECTIONS AND WIRING
7.1. Wiring Precautions
• The installation must be conducted in accordance with local and national wiring regulations,
codes and standards.
• Only the power cord with the rated voltage and specified circuit for air conditioner can be used.
• Do not apply excessive force to the power cord.
• The electrical installation should be carried out by the technician as instructed by the local and
national regulations, codes and standards. This manual should be followed.
• The diameter of the power cord should meet the recommendations in Table 10. Always replace a
damaged power cord with the equivalent specified cord.
• Always ensure the unit is correctly earthed and the earth wire is connected to the dedicated
device of the building by the technician. Select the air switch coupled with the leakage current
protection switch as per Table 10 recommendations to meet capacity, magnetic and thermal
tripping functions in the event of a short circuit and overload.
Table 10: Power Cord Recommendations
Model Power Supply Air Switch Capacity
(A)
Recommended Cord
(Pieces x Sectional
Area)
LNMT100V4 220-240V
50H z
32 3×4mm2
LNMT114V4 220-240V
50H z
32 3×4mm2
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit
DANGER

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LNMT100V4
Figure 10: LNMT100V4 Wiring Diagram
LNMT114V4
Figure 11: LNMT114V4 Wiring Diagram
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LENNOX MULTI SPLIT INVERTER
Outdoor Unit