Lennox 4 Series User manual

LENNOX MULTI SPLIT INVERTER
AIR CONDITIONER
Installation Manual
Slim Line Ducted Indoor Unit - Series 4

213 23 50 |lennoxaus.com.au
CONTENTS
1.0. Safety Precautions 4
2.0. Installation Location 6
3.0. Installation Instructions 8
4.0. Rated Working Conditions 25
5.0. Troubleshooting 26
6.0. Maintenance 27
LENNOX MULTI SPLIT INVERTER
Slim Line Ducted Indoor Unit

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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
Slim Line Ducted Indoor Unit
Applicable to Model Numbers:
• LNMTDSS035V4
• LNMTDSS050V4
• LNMTDSS060V4
• LNMTDSS071V4

1.0. SAFETY PRECAUTIONS
1.1. 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.
1.2. Operation and Maintenance
• Never connect the unit to a multi-purpose socket outlet, as this may cause a fire hazard.
• Always disconnect power supply when cleaning the air conditioner, to minimise the risk of electric
shock, injury or damage to the appliance.
• Never install or operate an air conditioner with a damaged supply cord. This must be replaced by
the manufacturer, its service agent or similarly qualified persons to avoid a hazard.
• Never wash the air conditioner with water, as this may cause electric shock, injury or damage to
the appliance.
• Maintenance must always be peormed by qualified personnel. Never attempt to repair the
air conditioner yourself, as this may cause electric shock, injury or damage. Please contact an
authorised service provider for all repairs and maintenance.
• Do not extend fingers or objects into the air inlet or air outlet, as this may cause personal injury or
damage.
• Do not block the air outlet or air inlet, as this may cause damage or malfunction, or aect
peormance of the unit.
4
DANGER
WARNING
CAUTION
NOTICE
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• If the following occurs, please turn o air conditioner and disconnect power immediately, and
contact the dealer or a qualified professional for service.
• Power cord is overheating or damaged.
• There is an abnormal sound during operation.
• Circuit breaker trips frequently.
• Air conditioner gives o a burning smell.
• Indoor unit is leaking.
• If the air conditioner operates under abnormal conditions, it may cause a malfunction, electric
shock or a fire hazard.
• Never use a metal object when turning the indoor unit on or o by the emergency operation switch,
as this may cause electric shock or injury.
• Never step on the top panel of the outdoor unit or place heavy objects on it, as this may cause
damage or personal injury.
1.3. Installation
• Installation must be peormed by qualified professionals. Otherwise, it may cause personal injury
or damage.
• The air conditioner must be installed in accordance with national and local wiring regulations,
codes and standards.
• An all-pole disconnection switch having a contact separation of at least 3mm in all poles should
be connected in the fixed wiring.
• Always ensure the power supply matches with the nameplate of the air conditioner. Unstable
power supply or incorrect wiring will cause malfunction. Always install the correct power supply
cables before operating the air conditioner.
• Always disconnect the power supply before proceeding with any work on the air conditioner.
• Do not supply power to the unit before finishing installation.
• Never install or operate an air conditioner with a damaged power supply cable. This must be
replaced by the manufacturer, its service agent or similarly qualified persons to avoid a hazard.
• The temperature of refrigerant circuit will be high, always keep the interconnection cable away
from the copper tube.
• The air conditioner is a Class 1 electric appliance. It must be properly earthed using a specialised
earthing device installed by a professional, otherwise it may cause electric shock.
• The yellow-green wire in air conditioner is the earth wire. The earth wire cannot be used for other
purposes.
• The earthing resistance should comply with national and local electrical safety regulations, codes
and standards.
• The indoor unit and outdoor unit must be connected by a qualified professional.
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2.0. INSTALLATION LOCATION
The installation of the unit must comply with all national and local safety regulations. The installation
quality directly aects the normal use of the unit, installation and troubleshooting of the unit should
be installed by a qualified technician.
2.1. Indoor Unit Location
The indoor unit should be installed in a location:
• Where there is no direct sunlight.
• Where the top hanger, ceiling and the building structure are strong enough to withstand the weight
of the unit.
• Where the drain pipe can be easily connected to outside.
• Where the flow of the air inlet and outlet are not blocked.
• Where the refrigerant pipe of the indoor unit can be easily led outside.
• Where there are no flammable or explosive substances or vapours.
• Where there is no corrosive gas, heavy dust, salt mist, smog or moisture.
Avoid installing the unit in the following areas, as peormance and operation may be aected.
• High concentrations of oil;
• Exposure to salt air, dust or sand;
• Where sulfur gas is presence (i.e. sulfur hot springs);
• Near high frequency devices (i.e. wireless devices, electric welding devices, or medical equipment).
2.2. Electrical Wiring
• 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.
CAUTION
CAUTION
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• 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 9. 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 perTable 9 recommendations to meet capacity, magnetic and thermal tripping functions
in the event of a short circuit and overload.
2.3. Earthing Requirements
• The air conditioner is classified a Class I appliance and must be earthed.
• The yellow-green wire is the earth line and cannot be: used for any other purpose, cut o, or fixed
by a self-tapping screw. Incorrect installation cause electrical hazard including electric shock or
death.
• A suitable earth terminal should be provided, and the earth wire must not be connected to any of
the following places:
1. Potable water pipes;
2. Gas pipes;
3. Sewage pipes;
4. Telecommunications earth wires.
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3.0. INSTALLATION INSTRUCTIONS
3.1. Indoor Unit Dimensions
NOTICE:
• All dimensions are listed in millimetres (mm), unless otherwise specified. Figure 1 is applicable to
LNMTDSS025V4, LNMTDSS035V4, LNMTDSS050V4, LNMTDSS060V4 and LNMTDSS071V4:
Figure 1: Indoor Unit Dimensions
Table 1: Indoor Unit Dimensions
Model A B C D E F G H I J
LNMTDSS025V4 742 491 662 620 700 615 782 156 200 635
LNMTDSS035V4 742 491 662 620 700 615 782 156 200 635
LNMTDSS050V4 942 491 862 820 900 615 982 156 200 635
LNMTDSS060V4 1142 491 1062 1020 1100 615 1182 156 200 635
LNMTDSS071V4 1142 491 1062 1020 1100 615 1182 156 200 635
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3.2. Indoor Unit Installation Space Requirements
NOTICE:
• All dimensions are listed in millimetres (mm), unless otherwise specified.
Figure 2: Indoor Unit Installation Space Requirements
3.3. Indoor Unit Installation
a. Installation Location Requirements
• Ensure the hanger is strong enough to withstand the weight of the unit.
• Ensure condensate drain pipe has enough fall to ensure good drainage flow.
• Ensure no obstructions to the inlet / outlet grille and adequate air circulation.
• Ensure the minimum clearances shown in Fig.2 are provided for maintenance access.
• Locate the unit away from heat sources, flammable or explosive substances, or smog.
• The unit is a concealed ceiling unit and should be mounted in the ceiling space, with appropriate
access provided.
• The power cables and connection wiring of the indoor and outdoor units must be at least 1m
away from TVs or radios to avoid inteerence and noise (the unit may still cause inteerence at
greater distances).
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LENNOX MULTI SPLIT INVERTER
Slim Line Ducted Indoor Unit

b. Installation of the Indoor Unit
1. Drill hole suitable for the M10 expansion bolt. Insert the M10 expansion bolt into the hole, and then
knock the nail into the bolt. Refer to the drawings for the distance between holes and see Figure 3
for the installation of the expansion bolt.
Figure 3: Installation of the Expansion Bolt
2. Install the hanger on the indoor unit, as shown in Figure 4.
Figure 4: Installing the Hanger
3. Install the indoor unit on the ceiling, as shown in Figure 5.
Figure 5: Installing the Indoor Unit
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1. Prior to installation, prepare all piping (refrigerant pipe, drain pipe) and wiring (wired controller,
wires between the indoor and outdoor unit) of the indoor unit
2. Reinforce ceiling openings to reduce vibration and noise transmission. Consult a qualified
tradesperson for advice.
3. If the ceiling cannot support the unit, the unit may need to be mounted on brackets to suit the
installation. Fabrication of the brackets shall be by others.
4. If the indoor unit is not installed in the air-conditioned space, the unit must be insulated to prevent
condensation.
3.4. Check Indoor Unit is Level
To prevent water becoming trapped and inteering with safe operation of the unit, it must be installed
correctly. Adjust the mounting bolts so the unit is secure and level. Adjust the unit so it has an inclination
of 5° downwards towards the drain pipe, and is horizontal in the other plane, as shown in Figure 6.
Figure 6: Levelling the Indoor Unit
CAUTION
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3.5. Installation of the Air Supply Duct
a. Installation of Rectangular Air Supply Duct
1. Figure 7 shows the correct arrangement for rectangular air supply ducting. Table 2 indicates the
parts required. Duct work should be installed in accordance with relevant standards and codes.
Figure 7: Arrangement for Rectangular Air Supply Ducting
Table 2: Parts Required for Installation of Rectangular Air Supply Duct
No. Name No. Name
1 Hanger 5 Filter Screen
2Return Air Duct 6 Main Air Supply Duct
3 Canvas Duct 7 Air Supply Outlet
4Return Air Inlet 8 Plenum Box
b. Installation of Round Air Supply Duct
1. Figure 8 shows the correct arrangement for rectangular air supply ducting. Table 3 indicates the
parts required. Duct work should be installed in accordance with relevant standards and codes.
Figure 8: Arrangement for Round Air Supply Ducting
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Table 3: Parts Required for Installation of Round Air Supply Duct
No. Name No. Name
1 Hanger 6 Transition Duct
2Return Air Duct 7 Air Supply Duct
3 Canvas Duct 8 Diuser
4Return Air Louver 9Diuser Joint
5 Air Supply Outlet
c. Special notes on Installation Steps of the Round Air Supply Duct
1. Preinstall the outlet of the round duct (7) on the transition duct (6) and then fix it with self-tapping
screws.
2. Insert the transition duct (6) onto the air outlet of the unit (5) and fix it with rivets.
3. Connect the outlet to the duct and seal all joins with tape. Other installation details are not covered
herein.
1. The maximum length of the duct equals the maximum length of the air supply duct plus the
maximum length of the return air duct.
2. If round duct is used on units fitted with auxiliary electric heating function, the straight length of the
transition duct cannot be less than 200mm.
3. At least one air supply grille shall be permanently open.
CAUTION
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3.6. Supply Air Outlet and Return Air Inlet Dimensions
NOTICE:
All dimensions are listed in millimetres (mm), unless otherwise specified.
Figures 9 & 10: Supply Air Outlet and Return Air Outlet Dimensions
Table 4: Dimensions of the Air Supply Outlet and Return Air Outlet
Model Air Supply Outlet Return Air Inlet
A B C D
LNMTDSS025V4 156 662 580 162
LNMTDSS035V4 156 662 580 162
LNMTDSS050V4 156 862 780 162
LNMTDSS060V4 156 1062 980 162
LNMTDSS071V4 156 1062 980 162
3.7. Installation of the Return Air Duct
1. The default installation location of the rectangular duct mounting flange is located at the rear and
the return air cover plate is at the bottom of the unit, as shown in Figure 11.
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Figure 11: Location of the Rectangular Duct Mounting Flange
2. If downward return air is desired, swap the rectangular flange and the return air cover plate.
3. Connect one end of the return air duct to the return air outlet of the unit and the other to the
return air louver. To prevent vibration and noise transmission, a flexible connection should be made
between the return air and the unit.
4. More noise is likely to be produced in the downward return air mode than the backward return air
mode. It is recommended that a silencer and plenum box be fitted to minimise noise.
5. The installation method should consider the conditions of the building, maintenance access, etc.,
as shown in Figure 12.
Figure 12: Installation Method
Table 5: Parts and Components of the Return Air Duct
No. Name No. Name
1Return Air Louvre 4 Indoor Unit
2 Flexible Connection 5 Air Supply Duct
3Return Air Duct 6 Access Grille
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3.8. Installation of the Condensate Pipe
1. The condensate pipe should be installed at an angle of5 - 10° tofacilitate the drainage ofcondensate
water from the unit. The condensate pipe should be insulated to minimise condensation (See Figure
13).
Figure 13: Thermal Insulation of the Condensate Pipe
2. The unit is fitted with a condensate outlet on both the le and right sides of the unit, to aid in
installation. Only one drain should be used and the other should be blanked o, sealed and covered
with insulation to avoid water leakage.
3. The right outlet is blanked o by default.
• Condensate pipe joins should be checked and sealed to prevent water leakage.
3.9. Condensate Drain Pipe Design and Installation
1. The diameter of the drain pipe should be larger or equal to that of the refrigerant pipe (PVC pipe,
outer diameter: 25mm, wall thickness ≥1.5mm).
2. The drain pipe should be as short as possible.
3. The drain pipe should be maintained at an angle of 1/50 ~1/100 to avoid water becoming trapped
or air pockets forming.
4. If suicient angle cannot be provided, a li pipe should be installed.
5. A maximum distance of 1-1.5m should be kept between the hangers to avoid the drain hose sagging
(see Figure 14).
6. Do not use excessive force when connecting the drain pipe to the unit. The end of the pipe should
CAUTION
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be fixed as close as possible to the side of the unit.
7. The drain pipe is not supplied with the unit and should be provided by others. Slide the end of the
PVC pipe over the drain outlet and secure with a hose clamp. Never connect the drain pipe to the
outlet by adhesive. (See Figure 15).
8. When a single drain pipe is used for multiple devices, the common section of the pipe should be
100mm lower than the drain hole of each device and should be sized appropriately for the total
water flow.
9. Condensate drains located in the air-conditioned space should be insulated to prevent water
damage.
Figure 14: Correct Condensate Drain Pipe Design and Installation
Figure 15: Correct Condensate Drain Pipe Design and Installation
3.10. Precautions when Installing a Li Pipe
• A li pipe should be used in situations where a suicient fall cannot be provided for a standard
condensate drain connection.
• The installation height of the li pipe should be less than 850mm. It is recommended to set an
inclination angle 1° - 2° for the li pipe toward the drainage direction. If the li pipe and the unit
form a right angle, the height of the li pipe must be less than 800mm.
Correct - With a minimum degree of slope 1/100 Incorrect
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•
Figures 16 & 17: Installing a Li Pipe
NOTICE:
• To prevent excessive force on the unit drain outlet, the drain hose connection between the li pipe
and the drain pipe should not be misaligned by more than 75mm (See Figure 17).
• If multiple drain pipes are joined to a single drain pipe, the pipe shall be installed as shown in Figure
17.
3.11. Testing the Drainage System
1. The drainage system on the unit should be tested prior to operation.
2. During the test, check to ensure the water flow goes through the pipe correctly and ensure the
joints do not leak. If unit is installed in new construction, it is suggested the test is carried out prior
to the ceiling being fitted.
3.12. Installation of the Refrigerant Piping
1. Refrigerant pipe installation andtesting shall be carried out bya qualified technician in accordance
with appropriate standards and codes.
2. Align the flared end of the copper pipe point with the threaded pipe on the unit and tighten the
screw by hand.
3. Use a torque wrench to tighten the joint in accordance with the recommended torque in Table 6
and as shown in Figure 18.
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Table 6: Moments of Torque for Tightening Screws
Diameter of Pipe (mm) Moment of Torque (Nm)
φ6.35 15-30
φ9.52 35-40
φ12.0 45-50
φ15.9 60-65
Figure 18: Tightening the Joint
4. Refrigerant pipe bends shall be of suitable radius to prevent cracking or crimping. All bends shall
be made using a pipe bender to bend the pipe.
5. Wrap exposed refrigerant pipe and joints in thermal insulation.
• When connecting the indoor unit and the refrigerant pipe, never apply excessive force to any joints;
otherwise the capillary pipe or other pipe may crack resulting in leakage.
• The refrigerant pipe should be securely supported by brackets.
3.13. Insulation for the Refrigerant Pipe
1. The refrigerant pipe should be insulated to prevent condensation.
2. The joints of the indoor unit should be wrapped with the insulating material and ensure there is no
gap between the insulation and the indoor unit, as shown in Figure 19.
CAUTION
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Figure 19: Insulation for the Refrigerant Pipe
3. Wrapping the pipe with tape.
• Wrap the pipe from the bottom of the outdoor unit to the top of the pipe where it enters the
wall.
• Fix the wrapped pipe on the wall with clamps.
• Do not wrap the pipe too tightly; otherwise the insulation eect will be reduced.
• Make sure the drain hose is separated from the refrigerant pipe
• Seal the wall penetration to prevent wind and rain ingress.
3.14. Connection to the Wiring Terminal
• All electrical work must be carried out by a licensed electrician.
a. Single-Core Wire
1. Strip 25mm of the insulating layer at the end of the wire with a wire stripper.
2. Loosen the screw on the wiring board of the air conditioning unit.
3. Use pliers to shape the end of the wire to a circle matching the size of the screw.
4. Insert the screw through the wire and then fix it to the wiring board.
CAUTION
WARNING
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