AC Inverter Service Manual_Jan 2012

AC Inverter Service Manual_Jan 2012
SERVICE MANUAL
FOR ROOM
AIR CONDITIONER
(Inverter Split-Type)
This manual is applicable only to the following models –
Australia 13 23 50 New Zealand 0800 653 330
Web www.lennoxaus.com.au
E963_Lennox Luna Inverter Service Manual 3.indd 40-1
LNIV2610
LNIV3510
LNIV5010
LNIV6510
23/01/12 9:28 AM
CONTENTS
1. PRECAUTIONS ................................................................. 3
1.1 Safety precautions ...................................................... 3
1.2 Warning ..................................................................... 3
2. FUNCTIONS ..................................................................... 5
3. DIMENSIONS ................................................................... 6
3.1 Indoor Unit ................................................................. 6
3.2 Outdoor Unit ............................................................... 7
1. PRECAUTIONS
1.1 Safety precautions
• To prevent injury to the user or other people and
property damage, the following instructions must be
followed.
• Incorrect operation due to not following instructions
may cause personal injury or damage.
• Before servicing the unit, be sure to read this service
manual first.
4. REFRIGERANT CYCLE DIAGRAM ..................................... 8
1.2 Warning
5. WIRING DIAGRAM ........................................................... 9
❯ INSTALLATION
5.1 Indoor Unit ................................................................. 9
5.2 Outdoor Unit ............................................................. 11
6. INSTALLATION DETAILS ................................................ 13
6.1 Wrench torque sheet for installation ........................... 13
6.2 Connecting the cables .............................................. 13
6.3 Pipe length and the elevation ..................................... 14
6.4 Installation for the first time ....................................... 15
6.5 Adding the refrigerant after running
the system for many years ........................................ 18
6.6 Re-installation while the indoor unit
need to be repaired .................................................. 19
6.7 Re-installation while the outdoor unit
need to be repaired .................................................. 21
7. OPERATION CHARACTERISTICS .................................... 23
8. ELECTRONIC FUNCTIONS .............................................. 24
8.1 Abbreviations ........................................................... 24
8.2 Display function ........................................................ 24
8.3 Main Protection ........................................................ 25
8.4 Operation Modes and Functions ................................ 25
9. TROUBLESHOOTING ........................................................ 33
9.1 Indoor Unit Error Display ............................................ 33
9.2 Diagnosis and Solutions ............................................ 33
• Do not use a defective or underrated circuit breaker. Use
this appliance on a dedicated circuit.
If these directions are not followed, you run the risk of starting
a fire or suffering an electric shock.
• Do not place anything on the power cable.
This increases the risk of fire or electric shock.
• Do not plug or unplug the power supply plug during
operation.
This increases the risk of fire or electric shock.
• Do not operate the product with wet hands.
• Do not place a heater or other appliance near the power
cable.
This increases the risk of fire or electric shock.
• Always ground the product.
Not doing so increases the risk of starting a fire or suffering an
electric shock.
• Do not allow water to run into electrical parts.
This may cause fire, failure of the product, or electric shock.
• Install the panel and the control box cover securely.
Not doing so increases the risk of starting a fire or suffering an
electric shock.
• Always install a dedicated circuit and circuit breaker.
Improper wiring or installation may cause a fire or electric
shock.
• Use the correctly rated fuse or circuit breaker
Not doing so increases the risk of starting a fire or suffering an
electric shock.
• Do not modify or extend the power cable.
Improper wiring or installation may cause a fire or electric
shock.
• Do not install, remove, or reinstall the unit by yourself
(customer).
Improper wiring or installation may cause a fire or electric
shock.
• For installation, always contact the dealer or an
authorized service centre.
• Do not install the product on a defective installation
stand.
E963_Lennox Luna Inverter Service Manual 1c.indd 2-3
• Do not let the air conditioner run for a long time when
the humidity is very high and a door or a window is left
open.
• Take care to ensure that the power cable cannot be
pulled out or damaged during operation.
Faulty cabling increases the risk of fire or electric shock.
• For electrical work, contact the dealer, seller, a qualified
electrician, or an authorized service centre.
Do not disassemble or repair the product as doing so will
increase the risk of fire or electric shock.
• Be careful when unpacking and installing the product.
Sharp edges may cause injury. Be especially careful of the
case edges and the fins on the condenser and evaporator.
2
• Ensure the installation area does not deteriorate with
age.
If the base collapses, the air conditioner could fall with it,
causing property damage, product failure, and personal injury.
• Do not store or use flammable gas or combustible
products near the unit.
This increases the risk of fire or electric shock.
• Do not use the product in an enclosed space for a long
time.
Oxygen deficiency may occur.
• If you experience a flammable gas leak, turn off the gas
and open a window for ventilation before turning the
product on.
• If strange sounds or smoke comes from product, turn
the breaker off or disconnect the power supply cable
immediately.
Not doing so increases the risk of fire or electric shock.
• Close the window and do not operate the unit in
electrical storms or severe winds. If possible, remove
the product from the window before the storm arrives.
Not doing so increases the risk of property damage, failure of
product or electric shock.
• Do not open the inlet grill of the product during
operation. (Do not touch the electrostatic filter, if the
unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
• If the unit is soaked, contact an authorized service
centre.
There is an increased risk of fire or electric shock.
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13/12/11 4:43 PM
• Be careful to avoid water entering the unit.
There is an increased risk of fire, electric shock, or product
damage.
• Ventilate the product from time to time when operating
it in conjunction with a stove etc.
Not doing so may increase the risk of fire, electric shock, or
product damage.
• Turn the main power off when cleaning or maintaining
the product.
Not doing so may increase the risk of fire, electric shock, or
product damage.
• When the product is not be used for a long time,
disconnect the power supply plug or turn off the circuit
breaker.
Doing so will minimise the risk of product damage or failure, or
unintended operation.
• Take care to ensure that nobody can step on or fall onto
the outdoor unit.
This could result in personal injury and product damage.
❯ CAUTION
• Always check for gas (refrigerant) leakage after
installation or repair of product.
Low refrigerant levels may cause unit failure.
• Install the drain hose correctly to ensure that water is
drained away properly.
A bad connection may cause water leakage.
• Keep unit level even when installing the product.
This will avoid vibration or any leakages from the unit.
• Do not install the product where noise or hot air
emissions from the outdoor unit could adversely affect
your neighbour.
• Use two or more people to lift and transport the product.
• Do not install the product where it will be exposed to
sea wind (salt spray) directly.
It may cause corrosion to the product. Corrosion, particularly
on the condenser and evaporator fins, could cause product
malfunction or inefficient operation.
4
E963_Lennox Luna Inverter Service Manual 2.indd 4-5
❯ OPERATIONAL CONSIDERATIONS
• Do not expose the skin directly to cool air for long time.
(Do not sit in the draft).
• Do not use the product for special purposes, such as
preserving foods, works of art etc.
It is a consumer-use air conditioner, not a precision
refrigeration system. Incorrect use may increase the risk of
damage or loss of property.
• Do not block the air inlet or outlet vents.
• Use a soft cloth to clean. Do not use harsh detergents,
solvents, etc.
Incorrect cleaning methods may increase the risk of fire,
electric shock, or damage to the plastic parts of the product.
• Do not touch the metal parts of the product when
removing the air filter. They are very sharp.
• Do not climb onto or use the outdoor units as a shelf as
the brackets may not carry the additional weight.
• Always insert the filter securely. Clean the filter every
two weeks or more often if necessary.
A dirty filter reduces the efficiency of the air conditioner and
could cause product malfunction or damage.
• Do not insert hands or other objects through air inlet or
outlet while the unit is use.
• Do not drink the water drained from the unit.
• Use a firm stool or ladder when cleaning or maintaining
the product.
Be careful and avoid personal injury.
• Replace all the batteries at the same time in the remote
control with new ones of the same type. Do not mix old
and new batteries or different types of batteries.
• Incorrect battery usage increases the risk of fire or
explosion.
• Do not recharge or break down the batteries. Do not
dispose of batteries in a fire.
They may explode.
• If the liquid from the batteries gets onto your skin or
clothes, wash thoroughly with clean water. Do not use
the remote control if the batteries have leaked.
2. FUNCTIONS
Model Names of Indoor/Outdoor Units
DC Inverter
Capacity
Indoor units
Outdoor units
9k
LNEO26V
LNCO26V
12k
LNEO35V
LNCO35V
18k
LNEO50V
LNCO50V
24k
LNEO65V
LNCO65V
Filter
Killer of formaldehyde
Ionizer+(O)
Ionizer(O)
8 degree heating(O)
Silver Ico Filter(O)
Heat compensation(O)
Vitamin C Filter(O)
Self-diag. function
3M HAM Filter(O)
Hydrophilic aluminium fin
Bio Filter(O)
Anti-rust cabinet
Golden Fin(O)
Valve protection cover
Self Clean(O)
PTC Heating Belt(O)
Follow me(O)
Compessor Cranckcase Heater(O)
5
21/12/11 10:28 AM
3.2 Outdoor Unit
3. DIMENSIONS
3.1 Indoor Unit
More than 30cm
More than 60cm
(Service space
More than 30cm
Fe
n
ob c e o
sta
r
cle
s
More than 60cm
More than 70cm
Model
W
D
H
LNEO26V
790
198
265
LNEO35V
920
223
292
998
240
322
LNEO50V
LNEO65V
L
R
Model
W
D
H
W1
A
B
760
285
590
823
530
290
LNCO50V
845
320
700
908
560
335
LNCO65V
900
315
860
980
590
333
LNCO26V
LNCO35V
H
Model
R(mm)
L(mm)
H(mm)
LNEO26V
151
100
45
LNEO35V
185
150
45
118.5
100
45
LNEO50V
LNEO65V
6
E963_Lennox Luna Inverter Service Manual 2.indd 6-7
Dimension of Installation Hole (mm)
∅65
7
21/12/11 10:28 AM
4. REFRIGERANT CYCLE DIAGRAM
5. WIRING DIAGRAM
5.1 Indoor Unit
INDOOR
OUTDOOR
LNEO26V
LIQUID SIDE
CHECK VALVE
(Heating Model only)
2-WAY VALVE
CAPILIARY TUBE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
GAS SIDE
REVERSING VALVE
(Heating Model only)
3-WAY VALVE
ACCUMULATOR
LNEO35V
COOLING
COMPRESSOR
8
E963_Lennox Luna Inverter Service Manual 2.indd 8-9
HEATING
9
21/12/11 10:28 AM
LNEO50V
5.2 Outdoor Unit
LNCO26V
LNEO65V
10
E963_Lennox Luna Inverter Service Manual 2.indd 10-11
LNCO35V
11
21/12/11 10:28 AM
LNCO50V
6. INSTALLATION DETAILS
6.1 Torque wrench installation sheet
Outside diameter
Torque
Additional tightening torque
mm
Inch
N.cm
N.cm
∅6.35
1/4
1500 (153kgf.cm)
1600 (163kgf.cm)
∅9.52
3/8
2500 (255kgf.cm)
2600 (265kgf.cm)
∅12.7
1/2
3500 (357kgf.cm)
3600 (367kgf.cm)
∅16
5/8
4500 (459kgf.cm)
4700 (479kgf.cm)
∅19
3/4
6500 (663kgf.cm)
6700 (683kgf.cm)
6.2 Connecting the cables
The connecting power cord should be selected according to the following specifications:
LNCO65V
12
E963_Lennox Luna Inverter Service Manual 2.indd 12-13
Rated current of appliance (Amps)
Nominal cross-sectional area (mm²)
>3 and ≤6
0.75
>6 and ≤10
1.0
>10 and ≤16
1.5
>16 and ≤25
2.5
The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which is located
on the side panel of the unit. Please refer to the nameplate before selecting the cable, fuse and switch.
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21/12/11 10:28 AM
6.3 Pipe length and elevation
6.4 Installation for the first time
The pipe length and the amount of refrigerant is determined by the table below:
Air and moisture in the refrigerant system have undesirable effects as detailed below:
Pipe Size
Model
LNIV2610
LNIV3510
LNIV5010
LNIV6510
Gas
Liquid
3/8"
(∅9.53)
1/4"
(∅6.35)
1/2"
(∅12.7)
1/4"
(∅6.35)
5/8"
(∅16.0)
3/8"
(∅9.53)
Standard
Length (m)
Max. Elevation
B (m)
Max. Length
A (m)
Additional
refrigerant (g/m)
5
8
20
20
5
8
20
20
5
10
25
20
5
10
25
40
•
•
•
•
•
Pressure in the system rises.
Current required to operate the unit increases.
Cooling or heating efficiency drops.
Moisture in the refrigerant circuit may freeze and block capillary tubing.
Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak-tested and properly cleared
to remove gas and moisture from the system.
Gas leak check (Soap water method):
Apply soapy water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections with a soft
brush to check for leakage at the connecting points of the piping. If bubbles appear, the pipes are leaking.
(Indoor unit)
(Outdoor unit)
(Liquid side)
Two-way valve
Close
(Gas side)
Three-way valve
Manifold valve
Compound meter
Pressure
gauge
20Pa
Lo
CAUTION
The capacity test is based on the standard length and the maximum permissive length is based on system reliability.
The oil trap should be installed every 5-7 metres
Handle Lo
Charge hose
Close
Hi
Handle Hi
Charge hose
Vacuum
pump
Vacuum
pump
1. Air purging with vacuum pump
1. Tighten the flare nuts of the indoor and outdoor units, confirming that both the 2-way and 3-way valves are set to the “closed” position.
2. Connect the charge hose with the push pin of handle to the 3-way valve’s gas service port.
3. Connect the charge hose of Handle Hi connection to the vacuum pump.
4. Fully open the Handle Lo of the manifold valve.
5. Turn on the vacuum pump to evacuate all gases.
6. Run the pump for 30 minutes and check whether the compound meter indicates -0.1Mpa. If this pressure level is not achieved after
pumping for 50 minutes, please check if there are any leakage points. Fully close the Handle Lo valve of the manifold valve and turn off
the vacuum pump. Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
7. Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7 seconds after the gas has come out, then tighten the flare
nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmospheric pressure. Then remove the
charge hose from the 3 way valve.
14
E963_Lennox Luna Inverter Service Manual 2.indd 14-15
8. Fully open the 2-way and 3-way valves and securely tighten the cap of the 3-way valve.
15
21/12/11 10:28 AM
2. Air purging by refrigerant
3. Adding refrigerant if the pipe length >5m
Electronic scale
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the
“closed” position.
2. Connect the charge set and a charging cylinder to the service
port of the 3-way valve.
3. Air purging. Open the valves on the charging cylinder and the
charge set. Purge the air by loosening the flare nut on the
2-way valve approximately 45° for 3 seconds then closing it
for 1 minute; repeat 3 times. After purging the air, use a torque
wrench to tighten the flare nut on the 2-way valve.
4. Check for gas leakage. Check the flare connections for gas
leakage.
16
E963_Lennox Luna Inverter Service Manual 1d.indd 16-17
Procedure:
5. Discharge the refrigerant. Close the valve on the charging
cylinder and discharge the refrigerant by loosening the flare nut
on the 2-way valve approximately 45° until the gauge indicates
0.3 to 0.5 Mpa.
6. Disconnect the charge set and the charging cylinder, and set
the 2-way and 3-way valves to the “open” position. Be sure to
use a hexagonal wrench to open the valve stems.
7. Mount the valve stems nuts and the service port cap. Be sure
to use a torque wrench to tighten the service port cap to a
torque of 18Nm. Be sure to check for gas leakage.
1. Connect the charge hose to the charging cylinder, open the
2-way valve and the 3-way valve. Connect the charge hose
which you disconnected from the vacuum pump to the valve at
the bottom of the cylinder. If the refrigerant is R410A, make the
cylinder bottom-up to ensure the liquid charge.
2. Purge the air from the charge hose. Open the valve at the
bottom of the cylinder and press the check valve on the charge
set to purge the air (be careful of the liquid refrigerant).
3. Put the charging cylinder onto the electronic scale and record
the weight.
4. Operate the air conditioner in the cooling mode.
5. Open the valves (Low side) on the charge set and charge the
system with liquid refrigerant.
6. When the electronic scale displays the proper weight (refer to
the table), disconnect the charge hose from the 3-way valve’s
service port immediately and turn off the air conditioner before
disconnecting the hose.
7. Mount the valve stem caps and the service port. Use a torque
wrench to tighten the service port cap to a torque of 18Nm. Be
sure to check for gas leakage.
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14/12/11 12:56 PM
6.5 Adding the refrigerant after running the system for many years
6.6 Re-installation while the indoor unit need to be repaired
1. Collecting the refrigerant into the outdoor unit
Electronic scale
Procedure:
1. Connect the charge hose to the 3-way service port, open the
2-way valve and the 3-way valve. Connect the charge hose
to the valve at the bottom of the cylinder. If the refrigerant is
R410A, make the cylinder bottom-up to ensure liquid charge.
2. Purge the air from the charge hose. Open the valve at the
bottom of the cylinder and press the check valve on the charge
set to purge the air (be careful of the liquid refrigerant).
3. Put the charging cylinder onto the electronic scale and record
the weight.
4. Operate the air conditioner in the cooling mode.
18
E963_Lennox Luna Inverter Service Manual 1c.indd 18-19
Procedure:
5. Open the valves (Low side) on the charge set and charge the
system with liquid refrigerant.
6. When the electronic scale displays the proper weight (refer to
the gauge and the pressure of the low side), disconnect the
charge hose from the 3-way valve’s service port immediately
and turn off the air conditioner before disconnecting the hose.
7. Mount the valve stem caps and the service port. Use a torque
wrench to tighten the service port cap to a torque of 18Nm. Be
sure to check for gas leakage.
1. Confirm that both the 2-way and 3-way valves are set to the
“open” position
Remove the valve stem caps and confirm that the valve stems
are in the “open” position.
Be sure to use a hexagonal wrench to undo the valve stems.
2. Connect the charge hose with the push pin of handle Lo to the
3-way valve’s gas service port.
3. Air purging of the charge hose. Open the handle Lo valve of the
manifold valve slightly to purge air from the charge hose for 5
seconds and then close it quickly.
4. Set the 2-way valve to the “closed” position.
5. Operate the air conditioner on the cooling cycle and stop it
when the gauge indicates 0.1MPa.
6. Set the 3-way valve to the “closed” position immediately.
Do this quickly so that the gauge ends up indicating 0.3 to
0.5Mpa. Disconnect the charge set, and tighten the 2-way and
3-way valve’s stem nuts. Use a torque wrench to tighten the
3-way valves service port cap to a torque of 1.8 kgf.m. Be sure
to check for gas leakage.
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13/12/11 4:43 PM
2. Air purging by the refrigerant
6.7 Re-installation while the outdoor unit need to be repaired
1. Evacuation of the whole system
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the
“closed” position.
2. Connect the charge set and a charging cylinder to the service
port of the 3-way valve. Leave the valve on the charging
cylinder closed.
3. Air purging. Open the valves on the charging cylinder and the
charge set. Purge the air by loosening the flare nut on the
2-way valve approximately 45° for 3 seconds then closing it
for 1 minute; repeat 3 times. After purging the air, use a torque
wrench to tighten the flare nut on the 2-way valve.
4. Check for gas leakage. Check the flare connections for gas
leakage.
20
E963_Lennox Luna Inverter Service Manual 1c.indd 20-21
Procedure:
5. Discharge the refrigerant. Close the valve on the charging
cylinder and discharge the refrigerant by loosening the flare nut
on the 2-way valve approximately 45° until the gauge indicates
0.3 to 0.5 Mpa.
6. Disconnect the charge set and the charging cylinder, and set
the 2-way and 3-way valves to the “open” position. Be sure to
use a hexagonal wrench to operate the valve stems.
7. Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap
to a torque 18Nm.
1. Confirm that both the 2-way and 3-way valves are set to the
“open” position.
2. Connect the vacuum pump to 3-way valve’s service port.
3. Evacuate for approximately one hour. Confirm that the
compound meter indicates -0.1Mpa.
4. Close the valve (Low side) on the charge set, turn off the
vacuum pump, and confirm that the gauge needle does not
move (approximately 5 minutes after turning off the vacuum
pump).
5. Disconnect the charge hose from the vacuum pump.
Be sure to check for gas leakage.
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13/12/11 4:43 PM
2. Refrigerant charging
7. OPERATION CHARACTERISTICS
Operation Mode
Outdoor temperature (ºC)
Room temperature (ºC)
Cooling operation
0 – 50
≥17
Heating operation
-15 – 34
≤30
CAUTION
1. If the air conditioner is used outside the above conditions,
certain safety protection features may come into operation
and cause the unit to operate abnormally.
2. The room relative humidity should be less than 80%. If the
air conditioner operates above this figure, the surface of
the air conditioner may attract condensation. Please set the
vertical air flow louvre to its maximum angle (vertically to the
floor), and set fan mode to HIGH.
3. Optimum performance will be achieved whilst operating
within this temperature zone.
Electronic scale
Procedure:
1. Connect the charge hose to the charging cylinder, open the
2-way valve and the 3-way valve. Connect the charge hose
which you disconnected from the vacuum pump to the valve at
the bottom of the cylinder. If the refrigerant is R410A, make the
cylinder bottom-up to ensure liquid charge.
2. Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the
check valve on the charge set to purge the air (be careful of the
liquid refrigerant).
3. Put the charging cylinder onto the electronic scale and record
the weight.
4. Open the valves (Low side) on the charge set and charge the
system with liquid refrigerant. If the system cannot be charged
with the specified amount of refrigerant, it can be charged a
little at a time (approximately 150g each time), operating the
air conditioner in the cooling cycle. However, one time is not
sufficient. Wait approximately 1 minute and then repeat the
procedure.
5. When the electronic scale displays the proper weight,
disconnect the charge hose from the 3-way valve’s service
port immediately. If the system has been charged with liquid
refrigerant while operating the air conditioner, turn off the air
conditioner before disconnecting the hose.
6. Mount the valve stem caps and the service port. Use a torque
wrench to tighten the service port cap to a torque of 18Nm. Be
sure to check for gas leakage.
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E963_Lennox Luna Inverter Service Manual 1c.indd 22-23
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13/12/11 4:43 PM
8. ELECTRONIC FUNCTIONS
8.1 Abbreviations
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
8.3 Main Protection
8.3.1 Three Minutes Delay at restart for compressor
A 1 minute delay for the 1st start-up and 3 minutes’ delay for
subsequent re-starts.
8.2 Display functions
8.2.1 Icon explanation on indoor display board.
If the unit detects that the time interval is not sufficient for a
continuous 240 secs, the unit will stop and the LED will display
the error. The correct zero crossing signal time interval should be
between 6-13 mins.
8.3.2 Temperature protection of compressor top
The unit will stop working when the compressor top temperature
protector cuts off, and will restart after the compressor top
temperature protector restarts.
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
8.3.8 Zero crossing detection error protection
8.3.3 Temperature protection of compressor
discharge
When the compressor discharge temperature increases, the
running frequency will be limited as stated below:
• Compressor discharge temp. T5 > 115° for 5s, compressor will
stop.
• 108° < T5 < 115°, decrease the frequency to the lower level
every 3 minutes.
• 90° < T5 < 105°, keep running at the current frequency.
• T5 < 90°, no limit for frequency.
8.4 Operation Modes and Functions
8.4.1 Fan mode
1. Outdoor fan and compressor stop.
2. Temperature setting function is disabled, and no setting
temperature is displayed.
3. Indoor fan can be set to high/med/low/auto.
4. The louvre operates same as in cooling mode.
5. Auto fan:
27.5
High
8.3.4 Fan Speed is out of control
27
When Indoor Fan Speed remains too low (300RPM) for a certain
time, the unit will stop and the LED will display the failure.
25.5
Medium
25
8.3.5 Inverter Module Protection
Low
The Inverter module has a protection function related to current,
voltage and temperature. If one of these protection functions
occur, the corresponding code will display on the indoor unit and
the unit will stop working.
8.4.2 Cooling Mode
run
Run Indication Lamp: This lamp lights up when the air
conditioner is in operation.
Auto Indication Lamp: Lights up during the Auto operation
8.3.6 Indoor fan delayed 10 seconds open function
8.4.2.1 Compressor running guidelines
When the unit starts up, the louvre will be active immediately
and the indoor fan will open 10 seconds later. If the unit runs in
heating mode, the indoor fan will be also controlled by the anticold wind function.
The maximum operating frequency of the compressor after
starting is specified in the diagram below:
8.3.7 Compressor pre-heating functions
Fmax=F4
45
Pre-heating permitting condition:
ion
timer
def.
Ion Indication Lamp: Lights up when Ionizer/Plasma
function is activated.
Timer Indication Lamp: Lights up during Timer operation
Defrost Indication Lamp: This indicator lights up when the
air conditioner starts defrosting automatically or when the
anti-cold wind function is activated in heating operation.
DIGITAL DISPLAY Indication Lamp: Displays current
setting temperature or malfunction codes when the air
conditioner is in operation.
24
E963_Lennox Luna Inverter Service Manual 4.indd 24-25
If T4 (outdoor ambient temperature) < 3° and the machine has
just been turned on or if T4 < 3° and compressor has been
switched off for over 3 hours, the compressor heating cable will
work.
Pre-heating mode:
If the current flow through the wiring terminal of the compressor is
too low, the compressor can get heated even if it is not operating.
Pre-heating release condition:
If T4 > 5° or the compressor starts running, the pre-heating
function will stop.
43
40
Fmax=F7
38
30
Fmax=F8
28
22
Fmax=F6
20
Fmax=F3
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2/02/12 10:13 AM
If users switch on the unit by remote control, the compressor will run at the Fmax frequency for 7 minutes according to the outdoor
ambient temperature. During the 7 minutes, the frequency limitation is active. 7 minutes later, the compressor running frequency will be
controlled as below:
8.4.2.2 Outdoor fan running guidelines
8.4.3 Heating Mode
8.4.3.1 Compressor running guidelines
The maximum operating frequency of the compressor after
starting is determined by the diagram below:
3.5
A
High
3.0
22
B
2.5
34
33
C
2.0
20
D
1.5
28
27
Low
E
1.0
F
0.5
-0.5
G
8.4.2.3 Indoor fan running rules
-1.0
H
In cooling mode, the indoor fan runs continuously and the speed
can be selected as high, medium, low and auto. Auto fan in
cooling mode acts as follow:
Temp. zone
A
B
C
D
E
F
G
Frequency
F8
F8
F7
F6
F5
F3
F1
Note:
When T1-Ts remains in the same temperature zone for 3 minutes, the compressor will run according to the following:
A~E: Increase the frequency to the higher level until reaches F8.
4
High
3
F: Maintain the current frequency.
Off
Fmax=F2
25
24
Fmax=F3
22
21
Fmax=F4
19
18
Fmax=F5
17
16
Fmax=F6
15
14
Fmax=F7
12
11
Fmax=F8
6
5
Fmax=F9
Fmax=F10
Medium
G: Decrease the frequency to the lower level until it reaches F1.
1.5
H: Run at F1 for 1 hour (if T1-Ts < -2°, the compressor will stop)
1
Meanwhile, the compressor running frequency is limited by the current.
Low
If users switch on the unit by remote control, the compressor will
run at the Fmax frequency for 7 minutes according to outdoor
ambient temperature. During the 7 minutes, the frequency
limitation is active.
8.4.2.4 Condenser temperature protection
Off
I3COOL
Decrease
I2COOL
Hold
I1COOL
• 55° < T3 < 60°, the compressor frequency will decrease to
the lower level until to F1 and then runs at F1. If T3 < 54°, the
compressor will keep running at the current frequency.
• T3 < 52°, the compressor will not limit the frequency and
return to the original frequency.
• T3 > 60° for 5 seconds, the compressor will stop working until
T3 < 52°.
Resume
8.4.2.5 Evaporator temperature protection
Off: Compressor stops.
Decrease: Decrease the running frequency to the lower level.
Hold: Maintain the current frequency.
Resume: No limitation for frequency.
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E963_Lennox Luna Inverter Service Manual 1c.indd 26-27
Note: When unit is in the “hold” zone for 3 minutes, the
compressor frequency will rise to the higher level. (The maximum
amount frequency will increase is 200%)
• T2 < 0°, the compressor will stop and restart when T2 ≥ 5°.
• 0° ≤ T2 < 4°, the compressor frequency will be limited and
reduced to the lower level
• 4° ≤ T2 ≤ 7°, the compressor will maintain the current
frequency.
• T2 > 7°, the compressor frequency will not be limited.
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13/12/11 4:43 PM
8.4.3.2 Outdoor fan running rules
7 minutes later, the compressor running frequency will be controlled as below:
8.4.3.4 Defrosting mode
Condition of defrosting:
T4 > 0°C,
H
When the unit is running, if the following two conditions are met,
the unit starts defrosting:
H
+5.0
+4.5
17
Low
• The unit runs with T3 < 3°C for 40 minutes and T3 keeps lower
than TCDI°C for more than 3 minutes.
• The unit runs with T3 < 3°C for 80 minutes and T3 keeps lower
than TCDI + 2°C for more than 3 minutes and TCDI = – 6°C.
G
+3.5
+3.0
F
+2.5
E
+2.0
D
15
T4 < 0°C,
High
If the 1st and 2nd conditions are met, then the program
determines if T2 has decreased by more than 5°C. When T2
has decreased by more than 5°C, it will automatically enter the
defrosting mode.
C
+1.5
B
+1.0
+0.5
8.4.3.3 Indoor fan running rules
If the compressor stops due to the room temperature rising, the
indoor fan will be forced to run for 127 seconds with breeze.
During this period, the anti-cold-wind is disabled.
If the machine runs in rating capacity test mode, the indoor fan
will run with rating speed and the anti-cold-wind function is
disabled.
A
Temp. zone
A
B
C
D
E
F
G
Frequency
F10
F9
F8
F7
F5
F3
F1
Indoor fan speed can be set as high, medium, low or auto fan and
the anti-cold-wind function is optional.
Auto fan action in heating mode:
▲T = 0°C as default.
No matter what value T4 is, if the machine runs with T3 < 3°C for
more than 120 minutes and T3 remains lower than TCDI + 4°C for
more than 3 minutes, the machine will enter the defrosting mode
no matter if T2 drops by more than 5°C or not.
Condition of ending defrosting:
If any one of the following conditions are met, the defrosting will
finish and the machine will return to normal heating mode.
• T3 rises to be higher than TCDE1°C.
• T3 remains higher than TCDE2°C for 80 seconds.
• The machine has run for 10 minutes in defrosting mode.
While TCDE1 = 12°C, TCDE2 = 8°C for LNIV2610.
TCDE1 = 15°C, TCDE2 = 8°C for other models.
Note:
When T1-Ts remains in the same temperature zone for 3 minutes, the compressor will run according to the following:
Setting
A~E: Increase the frequency to the higher level until to F10.
44
F: Maintain the current frequency.
G: Decrease the frequency to the lower level until to F1.
38
37
H: Run at F1 for 1 hour (if T1-Ts-▲T > 6°C, the compressor will stop)
Low
Meanwhile, the compressor running frequency is limited by the current.
34
33
Breeze
Off
I3HEAT
17
Off
Decrease
I2HEAT
Hold
I1HEAT
Resume
Off: Compressor stops.
Decrease: Decrease the running frequency to the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
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E963_Lennox Luna Inverter Service Manual 3.indd 28-29
Note:
When the unit is in the “hold” zone for 3 minutes, the compressor
frequency will rise to the higher level. (The maximum frequency
increase is 200%)
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23/01/12 9:28 AM
Defrosting action:
8.4.3.5 Evaporator coil temperature protection
8.4.6.3 Operation rules:
For LNIV2610:
• T2 > TEH2°C, the compressor running frequency decreases to
the lower level and runs for 20 seconds.
• When the frequency decreases to F2 and the T2 is still over
TEH2°C for 3 minutes, the compressor will stop.
• T2 < 48°C or T2 stays in the range 48°C - TEH2°C for 6
minutes, the frequency will not be limited by T2.
• T2 > 60°C, the compressor will stop and restart when
T2 < 48°C.
Forced cooling mode:
While TEH2 = 53°C for LNIV2610 and LNIV3510
TEH2 = 55°C for LINV5010 and LNIV6510
Forced auto mode:
The action of forced auto mode is the same as normal auto mode
with 24°C setting temperature.
8.4.7 Timer function
8.4.7.1 Timing range is 24 hours.
8.4.7.2 Timer on. The machine will turn on automatically when
reaching the set time.
8.4.4 Auto mode
This mode can be chosen with the remote control and the setting
temperature can be changed between 17–30°C. In auto mode,
the machine will choose cooling, heating or fan-only mode
according to ▲T (▲T =T1-Ts).
▲T = T1 - Ts
Running mode
▲T > 1°C
Cooling
-1 < ▲T ≤ 1°C
Fan-only
▲T ≤ -1°C
Heating
Indoor fan will run on auto in the relevant mode.
For other models:
The compressor runs at F2 frequency and indoor fan runs as
breeze. After running for 30 minutes, the machine will turn to auto
mode as 24°C setting temperature.
The louvre operates same as in relevant mode.
If the machine switches modes between heating and cooling, the
compressor will keep stopping for 15 minutes and then choose
the relevant mode according to T1-Ts. If the temperature setting is
modified, the machine will choose running function again.
8.4.5 Drying mode
8.4.5.1 Indoor fan speed is fixed at breeze and can’t be changed.
The louvre angle is the same as in cooling mode.
8.4.5.2 Compressor running rules
8.4.5.3 Low indoor room temperature protection
In drying mode, if room temperature is lower than 10°C, the
compressor will stop and not resume until room temperature
exceeds 12°C.
8.4.5.4 Evaporator anti-freezing protection, condenser high
temperature protection and outdoor unit frequency limit are active
and the same as that in cooling mode.
8.4.5.5 The outdoor fan operates the same as in cooling mode.
8.4.6 Forced operation function
8.4.7.3 Timer off. The machine will turn off automatically when
reaching the set time.
8.4.7.4 Timer on/off. The machine will turn on automatically when
reaching the set “on” time, and then turn off automatically when
reaching the set “off” time.
8.4.7.5 Timer off/on. The machine will turn off automatically when
reaching the set “off” time, and then turn on automatically when
reaching the set “on” time.
8.4.7.6 The timer function will not change the unit’s current
operation mode. If the unit is off, it will not start up after setting
the “timer off” function. When reaching the set time, the timer LED
will be off and the unit running mode will not be changed.
8.4.7.7 The set time is relative to the actual time.
8.4.8 Sleep function mode
8.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours the
units leaves this mode and turns off.
8.4.8.2 Operation process in sleep mode is as follows:
When cooling, the set temperature rises 1°C (be lower than 30°C)
every one hour. 2 hours later the setting temperature stops rising
and indoor fan is fixed at low speed.
When heating, the set temperature decreases 1°C (be higher than
17°C) every one hour. 2 hours later the set temperature stops
rising and indoor fan is fixed at low speed.
8.4.8.3 Timer setting is available
8.4.8.4 When user uses timer off function in sleep mode (or sleep
function in timer off mode) and the set time is less than 7 hours,
sleep function will be cancelled when reaching the set time. If the
set time is more than 7 hours, the machine will not stop until it
reaches the set time in sleep mode.
8.4.6.1 Enter forced operation function:
Model
FD
FD1
LNIV3510
60
70
90
100
LNIV5010
LNIV6510
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E963_Lennox Luna Inverter Service Manual 4.indd 30-31
When the machine is off, pressing the touch button will change
the setting to forced auto mode. Pressing the button again within
5 seconds will change the setting to forced cooling mode. In
forced auto, forced cooling or any other operation mode, pressing
the touch button will turn off the machine.
8.4.6.2 In forced operation mode, all general protections and
remote control are available.
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2/02/12 10:13 AM
8.4.9 Auto-Restart function
8.4.11 Ionizer+ function (optional)
9. TROUBLESHOOTING
The indoor unit is equipped with an auto-restart function, which
is carried out through an auto-restart module. In the case of a
sudden power failure, the module memorizes the set conditions
before the power failure. The unit will resume the previous
operation settings (not including swing function) automatically
after 3 minutes when power returns.
9.1 Indoor Unit Error Display
Display
If the previous condition was forced cooling mode, the unit will run
in cooling mode for 30 minutes and turn to auto mode as 24°C
set temperature.
There is a one (1) minute delay for the compressor to restart if
power to the unit is switched off accidentally before turning the
mains off. For other conditions, the compressor will have a three
(3) minute delay when restarting.
8.4.10 Ionizer function (optional)
The indoor unit is equipped with an Ionizer, which is controlled
by the CLEAN AIR button on the remote control. When the unit is
turned on, press the CLEAN AIR button to activate the function.
Press it again to stop the function. During the time that the Ionizer
is controlled by remote control, the Ionizer will be turned off
automatically if the indoor fan stops running due to a malfunction
or anti-cold-wind. When the indoor fan restarts after a malfunction
has been rectified and anti-cold-wind has been released, the
Ionizer option will be available again.
LED STATUS
E0
EEPROM parameter error
E1
Indoor/outdoor units communication protection
E2
Zero-crossing signal error
E3
Indoor fan speed out of control
When the positive ions and negative ions are neutralized they
release tremendous amounts of energy which sterilize the air
passing through and alter the structure of any resident bacteria.
E5
Open or short circuit of outdoor temperature sensor or outdoor unit
EEPROM parameter error
E6
Open or short circuit of room or evaporator temperature sensor
The residual negative ions not only eliminate odour, dust, smoke
and pollen particles in the air, but also bring a fresh and healthy
sensation to the user - just like being in a forest or standing close
to a waterfall. This function is available only when the unit is on
using the remote control. After the unit has been turned on, the
Ionizer+ function is switched on when the user presses the ”clean
air” button on the remote control. Pressing the button again will
switch off the ionizer function. The Ionizer+ function only works
when the indoor fan motor is running. If the indoor fan motor is
off, the Ionizer+ also stops working even though the Ionizer+
function is available.
E7
Outdoor fan speed out of control
P0
IBM malfunction or IGBT over-strong current protection
P1
Over voltage or too low voltage protection
P2
Temperature protection of compressor top
P4
Inverter compressor drive error
Ionizer+ is a device that ionizes the air through positive and
negative high voltage electrodes operating simultaneously.
P.S. The Ionizer+ function cannot be used at the same time as the
Ionizer function.
Note: E4 & P3: Reserved function.
9.2 Diagnosis and Solutions
9.2.1 EEPROM parameter error
8.4.12 8°C Heating (optional)
When using the heating function, the preset temperature of the
air conditioner can be as low as 8°C, which keeps the room
temperature steady at 8°C and prevents household things
freezing when the house is unoccupied for a long time in severe
cold weather.
Turn off the power supply and turn
it back on 5 secs later
The problem returns
Is the EEPROM chip plugged into
the indoor PCB properly?
No
Fix the connection
Yes
Replace the main PCB for the
indoor unit
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E963_Lennox Luna Inverter Service Manual 4.indd 32-33
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2/02/12 10:13 AM
9.2.2 Indoor and outdoor unit communication protection error
9.2.3 Fan speed has been out of control
Turn off the power supply. After 1 minute, re-start
the unit using the remote control
Turn off the power supply and turn
it back on 5 secs later
The unit does not work normally
Check the wiring between the indoor and outdoor units.
Are the L, N, S & GND wires properly connected?
The unit does not work normally
No
Re-connect and re-test
Yes
Are the LED4 (red) and LED1 (yellow) lights
blinking on the outdoor PCB?
Turn off the unit and rotate the cross fan.
Does it rotate freely?
No
Disassemble the connection between
the fant and the motor. Check if the
bearing is normal. If not, change the
bearing. If OK, go to the next step.
Yes
Yes
Replace indoor PCB
The unit does not
work normally
No
Is the fan motor connector and
connection good?
Yes
Yes
The power supply for the outdoor PCB has failed.
Check the wiring on the outdoor PCB comparing it to
the wiring plate. Are the connections good?
Is the voltage reaching the fan motor?
Yes
Replace the fan motor
Replace the outdoor e-box
No
No
Replace the PCB
Fix the connection.
9.2.4 Open or short circuit of temperature sensor
Check the connections between the sensors
and the OCB. Are the connections good?
Yes
Replace the sensor and check if the error
re-occurs.
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E963_Lennox Luna Inverter Service Manual 3.indd 34-35
Yes
Replace the outdoor PCB
35
23/01/12 9:28 AM
9.2.5 IGBT excessive current protection
9.2.7 High temperature protection of compressor top
Check whether the connections between the
outdoor PCB and the IPM are good.
Does the compressor work?
No
Is the connection OK?
Yes
No
Re-connect the wiring
Yes
Yes
No
Check whether the IPM is affixed to
the radiator tightly.
No
Fasten the IPM to the radiator
Is the refrigerant circulation
volume normal?
Is the protector OK?
Yes
No, Charge refrigerant
Replace the outdoor PCB
The unit does not work normally
Replace the IPM
Replace it
Replace the compressor
Do the same problems occur
after recharging the gas?
There is a blockage (e.g in the capillary tubing
or at one of the weld points in the pipes)
9.2.6 Excessive or too low voltage protection
No
Is the power supply good?
Yes
Replace the outdoor e-box
Make sure the power supply is normal
9.2.8 Inverter compressor drive error
Are the connections to the compressor good?
Is the wiring sequence correct? Is the voltage
supply within the correct range?
No
Re-connect and test again.
Yes
No
Replace the outdoor PCB
Replace the inverter compressor
9.2.9 Zero crossing detection error
This alarm is triggered when the main chip can’t detect an over-zero signal. When such a failure occurs, the main control board must be faulty.
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E963_Lennox Luna Inverter Service Manual 1c.indd 38-39
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