innovair PIN413C2V31 User manual

NATURE INVERTER
SERVICE MANUAL
PIN413C2V31
PIN519C2V31
PIN624C2V31
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......................................................................................................................... 4
2.1 Model Names of Indoor/Outdoor units..........................................................................................4
2.2 Part names of Indoor/Outdoor units..............................................................................................5
2.3 Functions of Indoor/Outdoor units.................................................................................................6
3. Dimension .................................................................................................................................................... 8
3.1 Indoor Unit.....................................................................................................................................8
3.2 Outdoor Unit................................................................................................................................10
5. Refrigerant Cycle Diagram.........................................................................................................................11
6. Wiring Diagram .......................................................................................................................................... 12
6.1 Indoor Unit...................................................................................................................................12
6.2 Outdoor Unit................................................................................................................................14
7 Installation Details...................................................................................................................................... 17
7.2 Connecting the cables.................................................................................................................17
7.3 Pipe length and the elevation......................................................................................................17
7.4 Installation for the first time .........................................................................................................18
7.5 Adding the refrigerant after running the system for many years.................................................19
7.6 Re-installation while the indoor unit need to be repaired............................................................19
7.7 Re-installation while the outdoor unit need to be repaired..........................................................20
8. Operation Characteristics......................................................................................................................... 22
9. Electronic Function ................................................................................................................................... 23
9.1 Abbreviation.................................................................................................................................23
9.2 Display function...........................................................................................................................23
9.3 Main Protection............................................................................................................................24
9.4 Operation Modes and Functions.................................................................................................25
10. Troubleshooting....................................................................................................................................... 29
10.1 Indoor Unit Error Display...........................................................................................................30
10.2 Outdoor unit error display..........................................................................................................31
10.3 Diagnosis and Solution..............................................................................................................34

1
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.

2
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.
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.

3
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.

4
2. Part Names And Functions
2.1 Model Names of Indoor/Outdoor units
Series
Capacity
Indoor units
Outdoor units
12k
PIN413C2V31-I PIN413C2V31-O
18k
PIN519C2V31-I PIN519C2V31-O
24k
PIN624C2V31-I PIN624C2V31-O

5
2.2 Part names of Indoor/Outdoor units

6
2.3 Functions of Indoor/Outdoor units
Ionizer(O)
Silver Ion Filter
Vitamin C Filter(O)
3M HAF Filter(O)
Bio Filter(O)
Golden Fin(O)
Cold Catalyst Filter
Compressor Crankcase Heater
(standard for 16k,21k)
Self Clean(O)
Follow Me(O)
8 Degree Heating(O)
Heat Compensation(O)
Self-diag. Function
PTC Heating Belt(O)
Filter
Louver Position Memory Function
Refrigerant Leakage Detect
O: optional function

7
Cold Catalyst Filter:
Eliminate formaldehyde and other volatile organic compounds as well as harmful gases and odors.
Ionizer:
Release negative ions, eliminate odor, dust, smoke and pollen particles to give you fresh and healthy air.
Silver Ion Filter:
Sterilize bacteria effectively by decomposing cell wall of bacteria.
Vitamin C Filter:
Release Vitamin C which can eliminate active oxygen to beautify the skin.
3M HAM Filter:
Open-hole-structure with charged electrostatic effectively capture dust and particles, ensure maximum air
flow and minimum pressure drop.
Bio Filter(O):
Bio filter consists of a specialized biological enzyme and Eco filter. The Eco filter catches very small airborne
dust particles and bacteria, fungi and microbes. Biological enzyme kills bacteria by dissolving their cell wall
thus eliminating the problem of re-pollution.
Golden Fin:
The Golden hydrophilic condenser can improve the heating efficiency by accelerating the defrosting process.
The unique anticorrosive golden coating on the condenser can withstand the salty air, rain and other corrosive
elements.
Self Clean:
When this function is activated, firstly the indoor unit operates as Fan-only mode with low fan speed, during
this period the condensed water will take some dust on evaporator fins away. After that the unit turns to
heating operation with low fan speed which dries the inside of indoor unit. Finally it turns to fan-only mode and
blows away the wet air. The whole process cleans the internal side of indoor unit and prevents the breeding of
bacteria.
Follow me:
With this technology, a temperature sensor is built in the remote control when you stay close to the remote
control, the unit will automatically change the operation mode to supply comfortable temperature just like the
air conditioner is following you.
Louver position memory function:
When starting the unit again after shutting down, its louver will restore to the angle originally set by the user
Refrigerant leakage detect:
The refrigerant leakage detect function can better prevent the compressor being damaged by refrigerant
leakage or compressor overload.
Self-diag.Function:
Monitoring some abnormal operations or parts failures, microcomputer of the air conditioner will switch off and
protect the system automatically.Meanwhile, the error or protection code will be displayed on the indoor unit.

8
3. Dimension
3.1 Indoor Unit
WD
H
Model
W
D
H
PIN413C2V31-I
770mm
(30.3in)
188mm
(7.4in)
255mm
(10.0in)
PIN519C2V31-I
905mm
(35.6in)
198mm
(7.8in)
275mm
(10.8in)
PIN624C2V31-I
1030mm
(40.6in)
218mm
(8.6in)
315mm
(12.4in)

9
LR
H
Model
R(mm)
L(mm)
H(mm)
Dimension of installation hole(mm)
PIN413C2V31-I
95mm
(3.7in)
170mm
(6.7in)
45mm
(1.8in)
Φ65mm(2.56in)
PIN519C2V31-I
80mm
(3.1in)
100mm
(3.9in)
45mm
(1.8in)
Model
R(mm)
L(mm)
H(mm)
Dimension of installation hole(mm)
PIN624C2V31-I
163mm
(6.4in)
293mm
(11.5in)
45mm
(1.8in)
Φ65mm(2.56in)
H
L
R

10
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
H
D
W1
A
B
PIN413C2V31-O
780
(30.7in)
250
(9.8in)
540
(21.3in)
843
(33.2in)
549
(21.6in)
276
(10.9in)
PIN519C2V31-O
760mm
(29.9in)
285mm
(11.2in)
590mm
(23.2in)
823mm
(32.4in)
530mm
(20.9in)
290mm
(11.4in)
PIN624C2V31-O
845mm
(33.3in)
320mm
(12.6in)
700mm
(27.6in)
908mm
(35.7in)
560mm
(22.0in)
335mm
(13.2in)

11
5. Refrigerant Cycle Diagram
For cooling only models:
INDOOR OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
CAPILIARY TUBE

12
6. Wiring Diagram
6.1 Indoor Unit
PIN413C2V31-I
PIN519C2V31-I

13
PIN624C2V31-IW

14
6.2 Outdoor Unit
PIN413C2V31-O
PIN519C2V31-O

15
PIN624C2V31-O
For PIN413C2V31-O

16
For PIN519C2V31-O
For PIN624C2V31-O

17
7 Installation Details
7.1 Wrench torque sheet for
installation
Outside diameter
Torque
Additional tightening
torque
Ф6.35mm
1/4in
1500N.cm(153kgf.cm)
1600N.cm(163kgf.cm)
Ф9.52mm
3/8in
2500N.cm(255kgf.cm)
2600N.cm(265kgf.cm)
Ф12.7mm
1/2in
3500N.cm(357kgf.cm)
3600N.cm(367kgf.cm)
Ф15.9mm
5/8in
4500N.cm(459kgf.cm)
4700N.cm(479kgf.cm)
Ф19mm
3/4in
6500N.cm(663kgf.cm)
6700N.cm(683kgf.cm)
7.2 Connecting the cables
The power cord should be selected according
to the following specifications sheet.
Appliance Amps
AWG Wire Size
10
18
13
16
18
14
25
12
30
10
The cable size and the current of the fuse or
switch are determined by the maximum
current indicated on the nameplate which
located on the side panel of the unit. Please
refer to the nameplate before selecting the
cable, fuse and switch.
7.3 Pipe length and the elevation
Models
Pipe size
Gas
Liquid
PIN413C2V31-I+PIN413C2V31-O
3/8in
(Ф9.52mm)
1/4in
(Ф6.35mm)
PIN519C2V31-I+PIN519C2V31-O
1/2in
(Ф12.7mm)
1/4in
(Ф6.35mm)
PIN624C2V31-I+PIN624C2V31-O
5/8in
(Ф15.9mm)
3/8in
(Ф9.52mm)
Models
Standard
length
Max.
Elevatio
n
Max.
Length
A
Additional
refrigerant
PIN413C2V31-I
PIN413C2V31-O
7.5m
(24.6ft)
10m
(32.8ft)
25m
(82.0ft)
15g/m
(0.53oz/3.3ft)
PIN519C2V31-I
PIN519C2V31-O
7.5m
(24.6ft)
20m
(65.6ft)
30m
(98.4ft)
15g/m
(0.53oz/3.3ft)
PIN624C2V31-I
PIN624C2V31-O
7.5m
(24.6ft)
25m
(82.0ft)
50m
(164ft)
30g/m
(1.07oz/3.3ft)

18
7.4 Installation for the first time
Air and moisture in the refrigerant system have
undesirable effects as below:
●Pressure in the system rises.
●Operating current rises.
●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 evacuated to remove gas and
moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral
detergent on the indoor unit connections or
outdoor unit connections by a soft brush to
check for leakage of the connecting points of
the piping. If bubbles come out, the pipes have
leakage.
1. Air purging with vacuum pump
1) Completely tighten the flare nuts of the
indoor and outdoor units, confirm 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 lo to the 3-way valves 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) Operate the vacuum pump to evacuate.
6) Make evacuation for 30 minutes and check
whether the compound meter indicates
-0.1Mpa(14.5Psi). If the meter does not
indicate -0.1Mpa(14.5Psi) after pumping 30
minutes, it should be pumped 20 minutes
more. If the pressure can’t achieve
-0.1Mpa(14.5Psi) after pumping 50 minutes,
please check if there are some leakage
points. Fully close the handle Lo valve of the
manifold valve and stop the operation of 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 7seconds
after the gas coming out, then tighten the
flare nut again. Make sure the pressure
display in the pressure indicator is a little
higher than the atmosphere pressure. Then
remove the charge hose from the 3 way
valve.
8) Fully open the 2 way valve and 3 way valve
and securely tighten the cap of the 3 way
valve.
2. Air purging by refrigerant
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’