innovair NIN522C2V31 User manual

NEXXOS INVERTER
SERVICE MANUAL
NIN516C2V31
NIN522C2V31
NIN1225C2V31
INVERTER MINI SPLIT SYSTEM
WARNING
The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
Installation or repairs made by unqualified persons can result in hazards to you and others.
Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
This service is only for service engineer to use.

CONTENTS
1. Precaution .................................................................................................................................................... 1
1.1 Safety Precaution .......................................................................................................................... 1
1.2 Warning ......................................................................................................................................... 1
2. Part Names And Functions ......................................................................................................................... 3
2.1 Model Names of Indoor/Outdoor units .......................................................................................... 3
2.2 Part names of Indoor/Outdoor units .............................................................................................. 4
3. Dimension .................................................................................................................................................... 5
3.1 Indoor Unit ..................................................................................................................................... 5
3.2 Outdoor Unit .................................................................................................................................. 8
4. Refrigerant Cycle Diagram ......................................................................................................................... 9
5. Wiring Diagram ........................................................................................................................................... 11
5.1 Indoor Unit .................................................................................................................................... 11
5.2 Outdoor Unit ................................................................................................................................ 14
6 Installation Details ...................................................................................................................................... 20
6.1 Wrench torque sheet for installation ........................................................................................... 20
6.2 Connecting the cables ................................................................................................................ 20
6.3 Pipe length and the elevation ..................................................................................................... 20
6.4 Installation for the first time ......................................................................................................... 22
6.5 Adding the refrigerant after running the system for many years ................................................ 23
6.6 Re-installation while the indoor unit need to be repaired ........................................................... 23
6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 24
7. Operation Characteristics ......................................................................................................................... 26
8. Electronic Function ................................................................................................................................... 27
8.1 Abbreviation ................................................................................................................................ 27
8.2 Display function ........................................................................................................................... 27
8.3 Main Protection ........................................................................................................................... 28
8.4 Operation Modes and Functions ................................................................................................. 29
9. Troubleshooting ......................................................................................................................................... 34
9.1 Indoor Unit Error Display ............................................................................................................. 35
9.2 Outdoor unit error display ........................................................................................................... 37
9.3 Trouble shooting.......................................................................................................................... 39
10 Disassembly Instructions ........................................................................................................................ 58
10.1 Indoor unit ................................................................................................................................. 58
10.2 Outdoor unit .............................................................................................................................. 62
Innovair Corporation
Nexxos Inverter

1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other people and
property damage, the following instructions must
be followed.
Incorrect operation due to ignoring instruction will
cause harm or damage.
Before service the unit, be sure to read this service
manual at first.
1.2 Warning
Installation
Do not use a defective or underrated circuit breaker.
Use this appliance on a dedicated circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer, seller, a
qualified electrician, or an authorized service
center.
Do not disassemble or repair the product,
there is risk of fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box
securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause
electric shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by
yourself (customer).
There is risk of fire, electric shock, explosion,
or injury.
Be caution when unpacking and installing the
product.
Sharp edges could cause injury, be especially
careful of the case edges and the fins on the
condenser and evaporator.
For installation, always contact the dealer or an
authorized service center.
Do not install the product on a defective
installation stand.
Be sure 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 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 power cable could not be
pulled out or damaged during operation.
There is risk of fire or electric shock.
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply plug
during operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with wet
hands.
Do not place a heater or other appliance near the
power cable.
There is risk of fire and electric shock.
Do not allow water to run into electrical parts.
It may cause fire, failure of the product, or
electric shock.
Do not store or use flammable gas or combustible
near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed space for
a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas and
open a window for ventilation before turn the
product on.
If strange sounds or smoke comes from product,
turn the breaker off or disconnect the power
supply cable.
There is risk of electric shock or fire.
Stop operation and close the window in storm or
hurricane. If possible, remove the product from the
window before the hurricane arrives.
There is 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.
When the product is soaked, contact an authorized
service center.
There is risk of fire or electric shock.
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Nexxos Inverter

Be caution that water could not enter the product.
There is risk of fire, electric shock, or product
damage.
Ventilate the product from time to time when
operating it together with a stove etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or
maintaining the product.
There is risk of electric shock.
When the product is not be used for a long time,
disconnect the power supply plug or turn off the
breaker.
There is risk of product damage or failure, or
unintended operation.
Take care to ensure that nobody could 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 failure of
product.
Install the drain hose to ensure that water is
drained away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
It can avoid vibration of water leakage.
Do not install the product where the noise or hot
air from the outdoor unit could damage the
neighborhoods.
It may cause a problem for your neighbors.
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 on the product.
Corrosion, particularly on the condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
 Operational
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 air conditioner, not a precision
refrigerant system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.
There is 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 step on or put anything on the product.
(outdoor units)
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 product is operated.
Do not drink the water drained from the product.
Use a firm stool or ladder when cleaning or
maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote control with
new ones of the same type. Do not mix old and
new batteries or different types of batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the batteries. Do
not dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto your skin
or clothes, wash it well with clean water. Do not
use the remote of the batteries have leaked.
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Nexxos Inverter

2. Part Names And Functions
2.1 Model Names of Indoor/Outdoor units
Capacity Indoor units Outdoor units
12k NIN516C2V31(ID) NIN516C2V31(OD)
18k NIN522C2V31(ID) NIN522C2V31(OD)
24k NIN1225C2V31(ID) NIN1225C2V31(OD)
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Nexxos Inverter

2.2 Part names of Indoor/Outdoor units
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Nexxos Inverter

3. Dimension
3.1 Indoor Unit
WD
H
Model
W
D
H
NIN516C2V31(ID) 920mm
(36.22in)
223mm
(8.78in)
292mm
(10.5in)
NIN522C2V31(ID) 998mm
(39.29in)
240mm
(9.45in)
322mm
(12.68in)
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Nexxos Inverter

Model
R
L
H
Dimension of installation hole
NIN516C2V31(ID)
185mm
(7.28in)
150mm
(5.91in)
45mm
(1.77in)
Φ65mm
(2.56in)
Model
R
L
H
Dimension of installation hole
NIN522C2V31(ID)
120mm
(4.72in)
100mm
(3.94in)
45mm
(1.77in)
Φ65mm
(2.56in)
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Nexxos Inverter

Model W D H
NIN1225C2V31(ID) 1450mm
(57.1in)
265mm
(10.43in)
340mm
(10.39in)
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Nexxos Inverter

3.2 Outdoor Unit
More than 60cm(23.6in)
More than 70cm(27.6in)
More than 30cm(11.8in)
More than 60cm(23.6in)
(Service space)
Fence or
obstacles
More than 30cm(11.8in)
Note: The above drawing is only for reference. The appearance of your units may be different.
Model
W
D
H
W1
A
B
NIN516C2V31(OD) 760mm
(29.9in)
285mm
(11.2in)
590mm
(23.2in)
823mm
(32.4in)
530mm
(20.9in)
290mm
(11.4in)
NIN522C2V31(OD) 845mm
(33.3in)
320mm
(12.6in)
700mm
(27.6in)
908mm
(35.7in)
560mm
(22.0in)
335mm
(13.2in)
NIN1225C2V31(OD)
900mm
(35.43in)
315mm
(12.40in)
860mm
(33.86in)
980mm
(38.58in)
590mm
(23.23in)
333mm
(13.11in)
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Nexxos Inverter

4. Refrigerant Cycle Diagram
For cooling only models:
INDOOR OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
CAPILIARY TUBE
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
ACCUMULATOR
T4 Ambient
temp. sensor
T5 Discharge
temp. sensor
T3 Condenser
temp. sensor
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Nexxos Inverter

For heat pump models:
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
Compressor
2-WAY VALVE
3-WAY VALVE
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
T3 Condenser
temp. sensor
Accumulator T5 Discharge temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
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Nexxos Inverter

5. Wiring Diagram
5.1 Indoor Unit
NIN516C2V31(ID)
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Nexxos Inverter

NIN522C2V31(ID)
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Nexxos Inverter

NIN1225C2V31(ID)
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Nexxos Inverter

5.2 Outdoor Unit
NIN516C2V31(OD)
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Nexxos Inverter

NIN522C2V31(OD)
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Nexxos Inverter

NIN1225C2V31(OD)
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Nexxos Inverter

For NIN516C2V31(OD)
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Nexxos Inverter

For NIN522C2V31(OD)
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Nexxos Inverter