INVENTOR P8MVI32-09WiFi User manual

• SERVICE MANUAL
ENGLISH
WALL MOUNTED UNIT
AIR CONDITIONING SYSTEMS
MODELS:
P8MVI32-09WiFi / P8MVO32-09
P8MVI32-12WiFi / P8MVO32-12
P8MVI32-18WiFi / P8MVO32-18
P8MVI32-24WiFi / P8MVO32-24

CONTENTS
1. Precaution .................................................................................................................................................... 2!
1.1 Safety Precaution .................................................................................................... 2!
1.2 Warning ................................................................................................................... 2!
2 Information servicing ................................................................................................................................... 4!
3. Model list .................................................................................................................................................... 10!
4. Dimension .................................................................................................................................................. 11!
4.1 Indoor Unit ............................................................................................................. 11!
4.2 Outdoor Unit .......................................................................................................... 14!
5. Refrigerant Cycle Diagram ....................................................................................................................... 18!
6 Installation Details ...................................................................................................................................... 19!
6.1 Wrench torque sheet for installation ...................................................................... 19!
6.2 Connecting the cables ........................................................................................... 19!
6.3 Pipe length and the elevation ................................................................................ 20!
6.4 Installation for the first time ................................................................................... 21!
6.5 Adding the refrigerant after running the system for many years ........................... 22!
6.6 Re-installation while the indoor unit need to be repaired ...................................... 22!
6.7 Re-installation while the outdoor unit need to be repaired .................................... 25!
7. Disassemble Guide ................................................................................................................................... 26!
8. Wiring Diagram .......................................................................................................................................... 32!
8.1 Indoor Unit ............................................................................................................. 32!
8.2 Outdoor Unit .......................................................................................................... 33!
9. Operation Characteristics ........................................................................................................................ 34!
10. Electronic function .................................................................................................................................. 35!
10.1 Abbreviation ........................................................................................................ 35!
10.2 Display function ................................................................................................... 35!
10.3 Main Protection ................................................................................................... 36!
10.4 Operation Modes and Functions ......................................................................... 37!
10.5 Multi-function board instruction (This multi-function board is optional) ............... 45!
11. Troubleshooting ...................................................................................................................................... 48!
11.1 Indoor Unit Error Display ..................................................................................... 49!
11.2 Trouble shooting ................................................................................................. 50!
Caution: Risk of fire/flammable materials

2
1. Precaution
1.1 Safety Precaution
n To prevent injury to the user or
other people and property damage, the
following instructions must be
followed.
n Incorrect operation due to
ignoring instruction will cause harm or
damage.
n Before service the unit, be sure
to read this service manual at first.
1.2 Warning
Ø Appliance shall be stored in a room
without continuously operating open flames
(for example an operating gas appliance) and
ignition sources (for example an operating
electric heater).
Ø Installation
n Do not install the unit at place
where leakage of flammable gas may
occur. In case gas leaks and
accumulates at surrounding of the
unit, it may cause fire.
n Do not use a defective or
underrated circuit breaker. Use this
appliance on a dedicated circuit.
There is risk of fire or electric shock.
n 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.
n Always ground the product.
There is risk of fire or electric shock.
n Install the panel and the cover of
control box securely.
There is risk of fire of electric shock.
n Always install a dedicated circuit
and breaker.
Improper wiring or installation may
cause fore or electric shock.
n Use the correctly rated breaker
of fuse.
There is risk of fire or electric shock.
n Do not modify or extend the
power cable.
There is risk of fire or electric shock.
n Do not install, remove, or
reinstall the unit by yourself
(customer).
There is risk of fire, electric shock,
explosion, or injury.
n 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.
n For installation, always contact
the dealer or an authorized service
center.
n Do not install the product on a
defective installation stand.
n 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.
n 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.
n Take care to ensure that power
cable could not be pulled out or
damaged during operation.
There is risk of fire or electric shock.
n Do not place anything on the
power cable.
There is risk of fire or electric shock.
n Do not plug or unplug the power
supply plug during operation.
There is risk of fire or electric shock.
n Do not touch (operation) the
product with wet hands.

3
n Do not place a heater or other
appliance near the power cable.
There is risk of fire and electric shock.
n Do not allow water to run into
electrical parts.
It may cause fire, failure of the product,
or electric shock.
n Do not store or use flammable
gas or combustible near the product.
There is risk of fire or failure of product.
n Do not use the product in a
tightly closed space for a long time.
Oxygen deficiency could occur.
n When flammable gas leaks, all
naked flames shall be removed or
extinguished.
n 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.
n 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.
n 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.
n When the product is soaked,
contact an authorized service center.
There is risk of fire or electric shock.
n Be caution that water could not
enter the product.
There is risk of fire, electric shock, or
product damage.
n Ventilate the product from time
to time when operating it together with
a stove etc.
There is risk of fire or electric shock.
n Turn the main power off when
cleaning or maintaining the product.
There is risk of electric shock.
n 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.
n Take care to ensure that nobody
could step on or fall onto the outdoor
unit.
This could result in personal injury and
product damage.
Ø CAUTION
n Always check for gas
(refrigerant) leakage after installation
or repair of product.
Low refrigerant levels may cause failure
of product.
n Install the drain hose to ensure
that water is drained away properly.
A bad connection may cause water
leakage.
n Keep level even when installing
the product.
It can avoid vibration of water leakage.
n 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.
n Use two or more people to lift
and transport the product.
n 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.
Ø Operational

4
n Do not expose the skin directly
to cool air for long time. (Do not sit in
the draft).
n 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.
n Do not block the inlet or outlet of
air flow.
n 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.
n Do not touch the metal parts of
the product when removing the air
filter. They are very sharp.
n Do not step on or put anything
on the product. (outdoor units)
n 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.
n Do not insert hands or other
objects through air inlet or outlet while
the product is operated.
n Do not drink the water drained
from the product.
n Use a firm stool or ladder when
cleaning or maintaining the product.
Be careful and avoid personal injury.
n 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.
n Do not recharge or disassemble
the batteries. Do not dispose of
batteries in a fire.
They may burn of explode.
n 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.
2 Information servicing
1.Checks to the area
Prior to beginning work on systems
containing flammable refrigerants, safety
checks are
necessary to ensure that the risk of ignition
is minimised. For repair to the refrigerating
system, the following precautions shall be
complied with prior to conducting work on
the
system.
2. Work procedure
Work shall be undertaken under a
controlled procedure so as to minimise the
risk of a
flammable gas or vapor being present
while the work is being performed.
3. General work area
All maintenance staff and others working in
the local area shall be instructed on the
nature
of work being carried out. Work in confined
spaces shall be avoided. The area around
the
work space shall be sectioned off. Ensure
that the conditions within the area have
been
made safe by control of flammable
material.
4. Checking for presence of refrigerant
The area shall be checked with an
appropriate refrigerant detector prior to and
during work,
to ensure the technician is aware of
potentially flammable atmospheres.
Ensure that the

5
leak detection equipment being used is
suitable for use with flammable
refrigerants, i.e. no
sparking, adequately sealed or intrinsically
safe.
5. Presence of fire extinguisher
If any hot work is to be conducted on the
refrigeration equipment or any associated
parts, appropriate fire extinguishing
equipment shall be available to hand. Have
a dry powder or
CO2 fire extinguisher adjacent to the
charging area.
6. No ignition sources
No person carrying out work in relation to a
refrigeration system which involves
exposing
any pipe work that contains or has
contained flammable refrigerant shall use
any sources of
ignition in such a manner that it may lead
to the risk of fire or explosion. All possible
ignition
sources, including cigarette smoking,
should be kept sufficiently far away from
the site of
installation, repairing, removing and
disposal, during which flammable
refrigerant can
possibly be released to the surrounding
space. Prior to work taking place, the area
around
the equipment is to be surveyed to make
sure that there are no flammable hazards
or ignition
risks.NO SMOKING signs shall be
displayed.
7. Ventilated area
Ensure that the area is in the open or that it
is adequately ventilated before breaking
into the
system or conducting any hot work. A
degree of ventilation shall continue during
the period
that the work is carried out. The ventilation
should safely disperse any released
refrigerant
and preferably expel it externally into the
atmosphere.
8. Checks to the refrigeration
equipment
Where electrical components are being
changed, they shall be fit for the purpose
and to the correct specification. At all times
the manufacturer's maintenance and
service guidelines shall be followed. If in
doubt consult the manufacturer's technical
department for assistance. The following
checks shall be applied to installations
using flammable refrigerants:
lthe charge size is in accordance with
the room size within which the refrigerant
containing parts are installed;
lthe ventilation machinery and outlets
are operating adequately and are not
obstructed;
lif an indirect refrigerating circuit is being
used, the secondary circuit shall be
checked
for the presence of refrigerant; marking to
the equipment continues to be visible and
legible.
lmarkings and signs that are illegible
shall be corrected;
lrefrigeration pipe or components are
installed in a position where they are
unlikely to be exposed to any substance
which may corrode refrigerant containing
components, unless the components are
constructed of materials which are
inherently resistant to being
corroded or are suitably protected against
being so corroded.
9. Checks to electrical devices
Repair and maintenance to electrical
components shall include initial safety
checks and component inspection

6
procedures. If a fault exists that could
compromise safety, then no
electrical supply shall be connected to the
circuit until it is satisfactorily dealt with. If
the fault cannot be corrected immediately
but it is necessary to continue operation,
an adequate
temporary solution shall be used. This
shall be reported to the owner of the
equipment so all
parties are advised. Initial safety checks
shall include:
lthat capacitors are discharged: this shall
be done in a safe manner to avoid
possibility of sparking;
lthat there no live electrical components
and wiring are exposed while charging,
recovering or purging the system;
lthat there is continuity of earth bonding.
10. Repairs to sealed components
10.1 During repairs to sealed
components, all electrical supplies shall be
disconnected from the equipment being
worked upon prior to any removal of sealed
covers, etc. If it is absolutely necessary to
have an electrical supply to equipment
during servicing, then a permanently
operating form of leak detection shall be
located at the most critical point to warn of
a potentially hazardous situation.
10.2 Particular attention shall be paid to
the following to ensure that by working on
electrical
components, the casing is not altered in
such a way that the level of protection is
affected. This shall include damage to
cables, excessive number of connections,
terminals not made to original
specification, damage to seals, incorrect
fitting of glands, etc.
lEnsure that apparatus is mounted
securely.
lEnsure that seals or sealing materials
have not degraded such that they no
longer serve the purpose of preventing the
ingress of flammable atmospheres.
Replacement parts shall be in
accordance with the manufacturer's
specifications.
NOTE: The use of silicon sealant may
inhibit the effectiveness of some types of
leak detection equipment. Intrinsically safe
components do not have to be isolated
prior to
working on them.
11. Repair to intrinsically safe
components
Do not apply any permanent inductive or
capacitance loads to the circuit without
ensuring that this will not exceed the
permissible voltage and current permitted
for the equipment in use. Intrinsically safe
components are the only types that can be
worked on while live in the presence of a
flammable atmosphere. The test apparatus
shall be at the correct rating.
Replace components only with parts
specified by the manufacturer. Other parts
may result
in the ignition of refrigerant in the
atmosphere from a leak.
12. Cabling
Check that cabling will not be subject to
wear, corrosion, excessive pressure,
vibration, sharp edges or any other
adverse environmental effects. The check
shall also take into account the effects of
aging or continual vibration from sources
such as compressors or fans.
13. Detection of flammable refrigerants
Under no circumstances shall potential
sources of ignition be used in the
searching for or detection of refrigerant
leaks. A halide torch (or any other detector
using a naked flame)
shall not be used.
14. Leak detection methods

7
The following leak detection methods are
deemed acceptable for systems containing
flammable refrigerants. Electronic leak
detectors shall be used to detect
flammable
refrigerants, but the sensitivity may not be
adequate, or may need re-calibration.
(Detection equipment shall be calibrated in
a refrigerant-free area.) Ensure that the
detector is not a potential source of ignition
and is suitable for the refrigerant used.
Leak detection equipment shall be set at a
percentage of the LFL of the refrigerant
and shall be calibrated to the refrigerant
employed and the appropriate percentage
of gas (25 % maximum) is confirmed. Leak
detection fluids are suitable for use with
most refrigerants but the use of detergents
containing chlorine shall be avoided as the
chlorine may react with the refrigerant and
corrode the copper pipe-work.
If a leak is suspected, all naked flames
shall be removed or extinguished.
If a leakage of refrigerant is found which
requires brazing, all of the refrigerant
shall be
recovered from the system, or isolated
(by means of shut off valves) in a part of
the system
remote from the leak. Oxygen free
nitrogen (OFN) shall then be purged
through the system both before and
during the brazing process.
15. Removal and evacuation
When breaking into the refrigerant circuit to
make repairs or for any other purpose
conventional procedures shall be used.
However, it is important that best practice
is
followed since flammability is a
consideration. The following procedure
shall be adhered to:
lremove refrigerant;
lpurge the circuit with inert gas;
levacuate;
lpurge again with inert gas;
lopen the circuit by cutting or brazing.
The refrigerant charge shall be recovered
into the correct recovery cylinders. The
system
shall be flushed with OFN to render
the unit safe. This process may need to be
repeated several times. Compressed air or
oxygen shall not be used for this task.
Flushing shall be achieved by breaking the
vacuum in the system with OFN and
continuing to fill until the working pressure
is achieved, then venting to atmosphere,
and finally pulling down to a vacuum. This
process shall be repeated until no
refrigerant is within the system. When the
final OFN charge is used, the system shall
be vented down to atmospheric pressure
to enable work to take place. This
operation is absolutely vital if brazing
operations on the pipe-work are to take
place.
Ensure that the outlet for the vacuum pump
is not close to any ignition sources and
there is
ventilation available.
16. Charging procedures
In addition to conventional charging
procedures, the following requirements
shall be followed:
lEnsure that contamination of different
refrigerants does not occur when using
charging equipment. Hoses or lines shall
be as short as possible to minimize the
amount of refrigerant contained in them.
lCylinders shall be kept upright.
lEnsure that the refrigeration system is
earthed prior to charging the system with
refrigerant.
lLabel the system when charging is
complete (if not already).
lExtreme care shall be taken not to
overfill the refrigeration system.

8
lPrior to recharging the system it shall be
pressure tested with OFN. The system
shall be
leak tested on completion of charging but
prior to commissioning. A follow up leak
test shall be carried out prior to leaving the
site.
17. Decommissioning
Before carrying out this procedure, it is
essential that the technician is completely
familiar with the equipment and all its
detail. It is recommended good practice
that all refrigerants are recovered safely.
Prior to the task being carried out, an oil
and refrigerant sample shall be taken.
In case analysis is required prior to re-use
of reclaimed refrigerant. It is essential that
electrical power is available before the task
is commenced.
a) Become familiar with the equipment and
its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure
that:
lmechanical handling equipment is
available, if required, for handling
refrigerant cylinders;
lall personal protective equipment is
available and being used correctly;
lthe recovery process is supervised at all
times by a competent person;
lrecovery equipment and cylinders
conform to the appropriate standards.
d) Pump down refrigerant system, if
possible.
e) If a vacuum is not possible, make a
manifold so that refrigerant can be
removed from various parts of the system.
f) Make sure that cylinder is situated on the
scales before recovery takes place.
g) Start the recovery machine and operate
in accordance with manufacturer's
instructions.
h) Do not overfill cylinders. (No more than
80 % volume liquid charge).
i) Do not exceed the maximum working
pressure of the cylinder, even temporarily.
j) When the cylinders have been filled
correctly and the process completed, make
sure that the cylinders and the equipment
are removed from site promptly and all
isolation valves on the equipment are
closed off.
k) Recovered refrigerant shall not be
charged into another refrigeration system
unless it has
been cleaned and checked.
18. Labelling
Equipment shall be labelled stating that it
has been de-commissioned and emptied of
refrigerant. The label shall be dated and
signed. Ensure that there are labels on the
equipment stating the equipment contains
flammable refrigerant.
19. Recovery
lWhen removing refrigerant from a
system, either for servicing or
decommissioning, it is
recommended good practice that all
refrigerants are removed safely.
lWhen transferring refrigerant into
cylinders, ensure that only appropriate
refrigerant
recovery cylinders are employed. Ensure
that the correct numbers of cylinders for
holding the total system charge are
available. All cylinders to be used are
designated for the recovered refrigerant
and labelled for that refrigerant (i.e. special
cylinders for the recovery of refrigerant).
Cylinders shall be complete with pressure
relief valve and associated shut-off valves
in good working order.
lEmpty recovery cylinders are
evacuated and, if possible, cooled before
recovery occurs.