Impecca ISMO-1821 User manual

Owner's Manual
Split Type Wall-mounted Air Conditioner
Model: ISMO-1821
Thank you for choosing our product.
For proper operation, please read and keep this manual carefully.
If you have lost the Owner’s Manual, please contact the local agent or
visit www.impecca.com for an electronic version.
v. 1.1

CONTENTS GENERAL INFORMATION
1
2
3
4
4
5
8
6
7
7
8
Technical Data
Electrical Connections
Installing The Outdoor Unit
Maintenance
Installation Dimension Diagram
Check After Installation
Bleeding
Conformity And Range
The Instructions Before Use
Name of Parts
Outdoor Unit Working Temperature Range
GENERAL
INSTALLER INFORMATION
The products in this manual may be different with the rea one, according to different models,l
some models have displayer and some models without displayer, the position and shape of
the displayer please refer to the real one.
In line with the company’s policy of continual product improvement, the aesthetic and dimensional
characteristics, technical data and accessories of this appliance may be changed without notice.
This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety.
Children should be supervised to ensure that they do not play with the appliance.
This marking indicates that this product should not be disposed with other
household wastes throughout the EU. To prevent possible harm to the
environment or human health from uncontrolled waste disposal, recycle
it responsibly to promote the sustainable reuse of material resources. To
return your used device, please use the return and collection systems or
contact the retailer where the product was purchased. They can take this
product for environmental safe recycling.

Explanation of Symbols
Indicates a hazardous situation that, if not avoided, will result in death
or serious injury.
Indicates a hazardous situation that, if not avoided, could result in death
or serious injury.
Indicates a hazardous situation that, if not avoided, may result in minor
or moderate injury.
Indicates important but not hazard-related information, used to indicate
risk of property damage.
Indicates a hazard that would be assigned a signal word
WARNING or CAUTION.
CONFORMITY AND RANGE GENERAL INFORMATION
Please read this owner's manual carefully before operating the unit and keep it carefully for consultation.
Only use the air conditioner as instructed in this booklet. These instructions are not intended to
cover every possible condition and situation. As with any electrical household appliance, common sense
and caution are therefore always recommended for installation, operation and maintenance.
1
Instructions for installation and use of this product are provided by the manufacturer.

THE INSTRUCTIONS BEFORE USE GENERAL INFORMATION
WARNING
When having a burning smell or
smoke,please turn off the power
supply and contact with the ser-
vice center.
If the abnormity still exists,the unit
may be damaged,and may cause
electric shock or fire.
Power must adopts the special
circuit to prevent fire.
Otherwise, it can cause electric
shock or fire.
Disconnect the power supply if
long putting the air conditioner
out of use.
Otherwise,the accumulated dusts
may cause overheating or fire.
Never damage the electric wire
or use the electric wire which is
not appointed.
Otherwise,it will cause overheating
or fire.
When cleaning,it is necessary
to stop driving and turn off the
power supply.
Cut off power supply
Otherwise,it may cause electric
shock or damage.
The power supply must adopt the
special circuit that with air switch
protection and assure it has enou-
gh capacity.The unit will be turned
on or off according to your requir-
ement automatically,please do not
turn on or turn off the unit freque-
ntly,otherwise disadvantage effect
may be caused to the unit.
Rated voltage of this air conditi-
oner 220-240V, 60Hz, The com-
pressor will vibrate sharply if the
voltage is too low, resulting in
damage to refrigerating system.
Electrical component are easy to
damage if the voltage is too high.
Don't attempt to repair the air
conditioner by yourself.
The wrong repair will lead to an
electric shock or fire,so you should
contact the service center to repair.
Don't step on the top of the
outdoor unit or place something
on it.
If it is damaged, it may lead to the
fall of the unit and cause the injury.
Please note whether the insta-
lled stand is firm enough or not.
Earthing: The unit must be reli-
ably earthed.The earthing cable
shall be connected to the spec-
ial earthing device in the const-
ruction.
As falling off the outdoor unit can be
dangerous.
Never cut off or damage power
cables and control wires. If the
power cable and signal control
wire were damaged, change
them by professional.
2
★ ★
★ ★
★
★
★ ★
★ ★
★
★

OUTDOOR UNIT
No. Description
1 Air outlet grille
2Valve
Be sure to cut off the power supply before cleaning the air conditioner; otherwise electric
shock might happen.
Wetting of air conditioner may cause the risk of electric shock. Make sure not to wash
your air conditioner in any case.
This product must not be disposed together with the domestic waste.
This product has to be disposed at an authorized place for recycling of electrical and
electronic appliances.
Volatile liquids such as thinner or gasoline will cause damage to the appearance of air
conditioner. (Only use soft dry cloth moist cloth clean the air conditioner cabinet).
The temperature of refrigerant circuit will be high,please keep the interconnection cable
away from the copper tube.
Note: The above figures are only intended to a simple
diagram of the appliance and may not correspond to the
appearance of the units that have been purchased.
NAME OF PARTS GENERAL INFORMATION
3
1
2
WARNING
P
L
H
Minimum power cord section
mm
mm
mm
L
P
H
Fuse or air switch
890
362
700
MODE
20
2.5
ISMO-1821
Electricity supply
Electrical data 208/230V,60HZ
mm
2
Size and clearance
TECHNICAL DATA GENERAL INFORMATION
OUTDOOR UNIT WORKING TEMPERATURE RANGE GENERAL INFORMATION
Maximum cooling
Maximum heating
48/-
27/-
OutdoorsideDB/WB( c)

INSTALLER
4
Wrong wire connection may cause malfunction of
some electric components.After fixing cable, ensure
that leads between connection to fixed point have
some space.
An all-pole disconnection switch having a contact
separation of at least 3mm in all pole should be
connected in fixed wiring.
2. Remove the cable clamp, connect the power connection
cable with the terminal at the row of connection and fix
the connection. The fitting line distributing must be
consistent with the indoor unit. terminal of line bank.
Wiring should meet that of indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been fixed well.
5. Install the handle.
unit (one screw).
The connection pipes and the connectiong wirings
of the unit A and unit B must be corresponding to
each other respective.
Note: the above figures are only intended to be a simple
diagram of the appliance and may not correspond to the
appearance of the units that have been purchased.
The appliance shall be installed in accordance with
national wiring regulations.
ELECTRICAL CONNECTIONS
1. Remove the handle at the right side plate of the outdoor
L1
L2
To the power supply
To unit B
Power cord
To unit A
connecting
cable
L1
L2
L1 L2
connecting
cable
Including an air switch with suitable capacity,
please note the following table. Air switch
should be included magnet buckle and heating
buckle function, it can protect the circuit-short
and overload. (Caution: please do not use the
fuse only for protect the circuit)
ISMO-1821 25A
Air switch capacityAir-conditioner

INSTALLING THE OUTDOOR UNIT INSTALLER
BLEEDING INSTALLER
5
Do not install the outdoor unit in pits or air vents
Installing the pipes
Use suitable connecting pipes and equipment for
the refrigerant R410A.
Vacuum pump
Humid air left inside the refrigerant circuit can cause com-
pressor malfunction. After having connected the indoor
and outdoor units, bleed the air and humidity from the
refrigerant circuit using a vacuum pump.
(1) Unscrew and remove the caps from the 2-way and 3-
way valves.
(2) Unscrew and remove the cap from the service valve.
(3) Connect the vacuum pump hose to the service valve.
(4) Operate the vacuum pump for 10-15 minutes until an
absolute vacuum of 10 mm Hg has been reached.
(5) With the vacuum pump still in operation, close the
low-pressure knob on the vacuum pump coupling.
Stop the vacuum pump.
(6) Open the 2-way valve by 1/4 turn and then close it
after 10 seconds. Check all the joints for leaks using
liquid soap or an electronic leak device.
(7) Turn the body of the 2-way and 3-way valves. Discon-
nect the vacuum pump hose.
(8) Replace and tighten all the caps on the valves.
Vacuum pump Vacuum pump
Location
Twisting moment (N.m)
35-40
60-65
45-50
70-75
Φ12
Φ19
Diameter (mm)
Φ9.52
Φ16
15-20Φ6
18K unit need to be installed the indoor unit
Caution: Installation Must be Performed in Accordance
with the NEC/CEC by Authorized Personnel Only.
conversion joint
18K MODE:
●
INDOOR
UNIT
Connect to the
indoor unit
Refrigerant fluid direction of fiow
3-way valve
2-way valve
inlet
(2)Turn
(8) Secure
(7)Turn to open fully
(2)Turn
(8) Secure
(6) Openby 1/4 turn
(7)Turn to open fully
(2)Turn
(8) Secure
Valve cap
Valve cap
Service
The refrigerant pipes must not exceed the maximum
heights 5m(1821K).
Wrap all the refrigerant pipes and joints.
Tighten the connections using two wrenches wor-
king in opposite directions.
Use bolts to secure the unit to a flat, solid floor.
When mounting the unit on a wall or the roof, make
sure the support is firmly secured so that it cannot
move in the event of intense vibrations or a strong
wind.
Install the drain fitting and the drain hose
(for model with heat pump only)
Condensation is produced and flows from the out-
door unit when the appliance is operating in the
heating mode. In order not to disturb neighbours
and to respect the environment,install a drain fitting
and a drain hose to channel the condensate water.
Install the drain fitting and rubber washer on the
outdoor unit chassis and connect a drain hose to it
as shown in the figure.
Model(m) 1821x2
Max. connection pipe length 20
Max. connection pipe length
(Simple one indoor unit) 10

Use suitable instruments for the refrigerant R410A.
Do not use mineral oils to clean the unit.
Ensure that the recommende dspace is left around the appliance.
The installation must be done by trained and qualified service personnel with reliability according to this
manual.
Contact service center before installation to avoid the malfunction due to unprofessional installation.
When picking up and moving the units, you must be guidedby trained and qualified person.
Do not use any other refrigerant than R410A.
●
MAINTENANCE INSTALLER
INSTALLATION DIMENSION DIAGRAM INSTALLER
6
30cm
or above
Space to the cover
200cm
50cm
30cm
(Air inlet side)
or above
or above
Space to the wall
(Air outlet side)
or above
or more
Space to the cover
50cm

CHECK AFTER INSTALLATION INSTALLER
7
Check Items
Is the installation reliable?
Has the gas leakage been checked?
Is the thermal insulation of the unit
sufficient?
Is the drainage smooth?
Does the power supply voltage accord
with the rated voltage specified on the
nameplate?
Are the lines and pipelines correctly
installed?
Are the models of lines in conformity
with requirements?
Are there any obstacles near the air
inlet and outlet of the indoor and out-
door units?
Have the length of refrigerating pipe
and refrigerant charge amount been
recorded?
Has the unit been safely grounded?
Problems Owing to Improper Installation
The unit may drop, vibrate or make noises
May cause unsatisfactory cooling (heating)
effect
May cause condensation and water dropping
May cause condensation and water dropping
The unit may bread down or the components
may be burned out
The unit may bread down or the components
may be burned out
The unit may bread down or the components
may be burned out
The unit may bread down or the components
may be burned out
It is not easy to decide the charge amount
of refrigerant.
Risk of electrical leakage

CUSTOMER SUPPORT
Before contacting customer support, please see the troubleshooting guide above.
Visit our website to contact us, find answers to Frequently Asked Questions, and for other
resources which may include an updated version of this user's guide.
 WWW.IMPECCA.COM
If you wish to contact us by phone, please be sure to have your model number and serial
number ready and call us between 9:00am and 6:00pm ET, at [phone].
Keep tabs on Impecca's newest innovations & enter contests via our social network feeds:
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 www.instagram.com/impecca/
@impeccausa

© 2016 Impecca, a division of LT Inc., Wilkes Barre, PA.

Thank you for choosing Commercial Air Conditioners, please read this
owner’s manual carefully before operation and retain it for future reference.
Commercial Air Conditioners
Owner's Manual
Flex Series R410A GMV Multi VRF
Floor and Ceiling Type
Indoor Unit (For North America)
Models:
ISMI-FC18
ISMI-FC24
v 1.1

User Notice
◆When installing, the entire capacity of the cooperating indoor unit should be not larger than
150% of outdoor unit, otherwise, it will cause the shortage of cooling (heating) capacity.
◆The power supply of the entire unit must be the power supply of outdoor unit. And disconnect
the main power of outdoor unit before cleaning.
◆In order to start up the unit successfully, the main power switch should be opened 8 hours
before the operation.
◆After receiving the turn off signal, every indoor unit will continue to work for 20-70sec to
make good use of the rest cool air or the rest heat air in the heat exchanger, which will prepare for
the next operation. And this is normal.
◆When the selected operating mode of the indoor unit is conflicted to the operating mode of
the outdoor unit, 5 sec later, the malfunction hint will be shown on the indoor unit or wired controller,
then the indoor unit will stop. At this time, change the operating mode of the indoor unit to the one
that would not conflict with the outdoor operating mode to make the operation normal. The HEAT
mode conflicts with each of the COOL mode, DRY mode and FAN mode, while the COOL mode,
DRY mode and FAN mode are compatible between each other.
◆The appliance shall not be installed in the laundry. The appliance shall not be used by
children without supervisor.
◆Power supply fluctuating range (+/-10%, +/-1Hz)
◆Humidity range: 30%~95%.
◆Main switch provided by end user: main switch handle should be black or gray, it can be
locked in “OFF” position with padlock.
◆The main disconnection device should be installed at a height of 0.6~1.7m. Over current
protection is required(UL 1995,CSA C22.2).
◆The cooling range of the unit is the outdoor ambient temp -5~48℃ DB, the heating range of
the unit (only for the heat pump type unit) is the outdoor ambient temp. -15~27℃ DB.
◆This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
This product must not be disposed together with the domestic waste. This product has
to be disposed at an authorized place for recycling of electrical and electronic appliances.
Thank you for selecting Impecca air conditioner. Before use, please read this
manual carefully and keep it properly for furthur reference.

Contents
1 Safety Precautions .......................................................................................... 1
2 Installation Precautions and Location Choosing ............................................. 2
2.1 Installation Precautions ......................................................................................... 2
2.2 Location Choosing ................................................................................................ 2
2.3 Imappropriate Location ......................................................................................... 2
3 Installation of Floor and Ceiling Type Indoor Unit ............................................ 3
3.1 Space Dimension for Unit Installation ................................................................... 3
3.2 Important Notice .................................................................................................... 3
3.3 Installation Description .......................................................................................... 3
3.4 Electrical Wiring .................................................................................................... 6
3.5 Drainpipe Installation ............................................................................................ 7
3.6 Install the Connection Pipes ................................................................................. 8
4 Part Names of Floor and Ceiling Type Indoor Unit ........................................ 10
5 Working Temperature Range ......................................................................... 11
6 Maintenance Method ..................................................................................... 12
6.1 Cleaning the Air Filters ........................................................................................ 12
6.2 Cleaning the Unit ................................................................................................ 12
6.3 At the Start of the Season ................................................................................... 12
6.4 During the off Season ......................................................................................... 12
7 Operating Instructions ................................................................................... 13
8 Malfunction Analysis ...................................................................................... 15
8.1 Service Center ..................................................................................................... 15
8.2 After-sales Service ............................................................................................... 16

Flex Series for North America
1
1 Safety Precautions
Please read this manual carefully before using this unit. Operate it correctly according to the
guide in this manual.
Please pay special attention to the indicating meaning of these two marks:
Warning! This mark means that the unit may cause property damage, personal injury or
loss of life if the operation is incorrect.
Caution! This mark means that the unit may cause minor or moderate property damage or
personal injury.
Warning!
◆
The unit should be earthed reliably. Do not connect the earth line to the gas pipe, water pipe,
drainage pipe or other unsafe places in potential.
◆Air conditioner must use special power supply circuit and switches for creepage protect and
air with enough capacity should be installed in the circuit.
◆Ensure that the connecting of power cord is reliable, otherwise, electric shock or fire may
happen.
◆Do not cut off the power supply when the unit is running, otherwise the lifetime of the unit will
be shortened.
◆Do not damage wires or use the wires that are not recommended, otherwise, electric shock
or fire may happen
◆Please don’t operate the unit with wet hands, or electric shock may happen.
◆Do not put a finge , a rod or other objects into the air outlet or inlet to avoid of damage or
injury.
◆Cut down the main power supply immediately if any abnormality happens (such as smell of
fire etc.). Contact with the service center and consult the qualified technician
◆Do not repair or adjust the air conditioner by yourself. Please contact the service center or
Impecca technicians for help.
◆Do not use the fuse with unsuitable capacity or iron thread instead of fuse, otherwise, it will
cause malfunction or fire
◆Switch off the power supply of the unit before cleaning the air conditioner, otherwise, electric
shock or damage may happen.
◆Please turn off the main power of the whole unit before cleaning the conditioner, otherwise
electric shock or harm may be happened.
◆Chemical sprayer should be placed 1m or more away from the unit, otherwise fire or
explosion may happen.
◆Do not block air inlets or outlets. Impaired air flow may result in insufficient performance or
trouble.

Flex Series for North America
2
2 Installation Precautions and Location Choosing
2.1 Installation Precautions
The installation of air conditioner must be conform to national and local safety
laws.
Installation quality will directly affect the normal use of air conditioner. Do not
attempt to install the air conditioner by yourself. Please contact your dealer after buying
this machine. Professional installation workers will provide installation and test services
according to installation manual.
Do not connect to power until all installation work is completed.
2.2 Location Choosing
＊Such a place where cool air can be distributed throughout the room.
＊Such a place where condensate water could be easily drained out.
＊Such a place that can handle the weight of indoor unit.
＊Such a place, which is easy for maintenance.
＊Such a place where is easy to get connected with the outdoor unit.
＊Such a place where is 1m or more away from other electric appliances such as television,
audio device, etc.
＊Avoid a location where there is heat source, high humidity or inflammable gas
＊Do not use the unit in the moist surroundings, such as a laundry, a bath, a shower or a
swimming pool.
＊Be sure that the installation conforms to the installation drawings.
2.3 Imappropriate Location
＊Where there is too much of oil.
＊Where it is acid base area.
＊Where there is irregular electrical supply.

Flex Series for North America
3
3 Installation of Floor and Ceiling Type Indoor Unit
3.1 Space Dimension for Unit Installation
The space around the unit is adequate for ventilation. (Refer to Fig.1)
>600
>1000
>300
>600
>1500
>300
>600
>600 >1500
>200
>2300
POWER
RUN
TIMER
Fig.1
3.2 Important Notice
(1). The unit must be installed by the professional personnel according to this install instruction
to ensure the well use.
Please contact the local Impecca special nominated repair department before installation. Any
malfunction caused by the unit that is installed by the department that is not special nominated
by Impecca would not deal with on time by the inconvenience of the business contact.
(2). It should be done by professional personnel when the air conditioner unit is moved to other
place.
3.3 Installation Description
＊Ceiling type
＊Floor type
These two types of units have similar installing procedure as follows:
(1). Determine the mounting position on ceiling or wall by using paper pattern to indicate indoor
frame. Mark the pattern and pull out the paper pattern.(Refer to Fig.2)
(2). Remove the return grill, the side panel and the hanger bracket from the indoor unit as per
procedure bellow.
＊Press the fixing knob of the air intake grills, the grilles will be opened wider and then pull
them out from the indoor.
＊Loosen the side panel fixing screw and remove the side panel. (Refer to Fig.3
＊Loosen two hanger bracket setting bolts (M8) on each side for less than 10mm. Remove two
hanger bracket fixing bolts (M6) on the rear side. Detach the hanger bracker by pulling it backward

Flex Series for North America
4
(Refer to Fig.5).
Installation
paper plank
Side panel fixing screw(M4)
Fig.2 Fig.3
(3). Set the suspension bolt. (Use W3/8 or M10 size suspension bolts)
＊Adjust the distance from the unit to the ceiling slab beforehand. (Refer to Fig.4)
(4). Fix the hanger bracket to the suspension bolt.
Warning!
＊Make sure that extended suspension bolt from the ceiling stays inside the appointed
position. Readjust the hanger bracket when it is out of the appointed position. (Refer to Fig.6)
＊Suspension bolt is fixed in the cap of indoor unit. Never remove the cap
(5). Lift the unit and slide forward unit in place. (Refer to Fig.7)
(6). Screw tightly both hanger bracket-setting bolts (M8). (Refer to Fig.5)
(7). Screw tightly both hanger bracket-fixing bolts (M6) to prevent the displacement of the
indoor unit. (Refer to Fig.5)
(8). Adjust the height so that rear side of the drainpipe slightly inclines to improve drainage.
Caution!
＊Adjust the height by rotating the nut with a spanner.
＊Insert the spanner into the hanger bracket through the interspace. (Refer to Fig.8)
In case of hanging
It is possible to install hanger brackets by not removing the brackets from the indoor unit. (Refer
to Fig.9)
Only the specified accessories and parts for installation work could be used

Flex Series for North America
5
Celling
40 or less
Hanger bracket
Suspension bolt
Celling slab
BOLT POSITION INWARD
Hanger bracket
Fig.4 Fig.5
Hanger bracket
setting bolt(M8)
Hanger bracket
fixing bolt(M6)
Hanger bracket
Fig.6 Fig.7
Fig.9Fig.8
When installing the indoor unit, you can refer the paper pattern for installation. Make sure that
the drainage side must be 10mm lower than the other side in order to drain the condensate water
easily.
AB
C
D
H
Unit:mm