Komfovent MOU User manual

MOU
EN Installation Manual

UAB KOMFOVENT we reserve the right to make changes without prior notice.
MOU2-20-03 3
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WEEE Directive (2002/96/EC) and your national law. This product should be handed over to a designated
collection point, or to an authorised collection site for recycling waste electrical and electronic equipment (EEE).
Improper handling of this type of waste could have a possible negative impact on the environment and human
health due to potentially hazardous substances that are generally associated with EEE. At the same time, your
cooperation in the correct disposal of this product will contribute to the e󰀨ective usage of natural resources. For
more information about where you can drop o󰀨 your waste equipment for recycling, please contact your local city
o󰀩ce, waste authority, approved WEEE scheme or your household waste disposal service.
Content
1. SAFETY PRECAUTIONS ............................................................................................................................... 4
2. OUTDOOR UNIT INSTALLATION................................................................................................................. 5
2.1. Outdoor Unit Installation Instructions ......................................................................................................... 5
3. REFRIGERANT PIPING CONNECTION....................................................................................................... 8
3.1. Notes On Pipe Length and Elevation......................................................................................................... 8
3.2. Refrigerant Piping Connection Instructions................................................................................................ 8
4. PIPING DIAGRAMS.......................................................................................................................................11
5. WIRING .......................................................................................................................................................... 12
5.1. Outdoor Unit Wiring................................................................................................................................. 13
6. AIR EVACUATION......................................................................................................................................... 14
6.1. Evacuation Instructions............................................................................................................................ 14
6.2. Note On Adding Refrigerant..................................................................................................................... 15
7. OUTDOOR UNIT SPECIFICATIONS........................................................................................................... 16
8. AHU KIT SPECIFICATIONS KA8140/8141, KA8243/8245......................................................................... 17
8.1. Introduction .............................................................................................................................................. 17
8.2. Specication and packing list................................................................................................................... 17
8.3. System design.......................................................................................................................................... 18
8.4. Function and Setting ................................................................................................................................ 18
8.4.1. KA8140/KA8141........................................................................................................................... 18
8.4.2. KA8243/KA8245........................................................................................................................... 19
8.5. Control module connection to controller................................................................................................... 21
8.5.1. KA8140/KA8141 connection to C6............................................................................................... 21
8.5.2. KA8140/KA8141 connection to C6M............................................................................................ 21
8.5.3. KA8140/KA8141 connection to C5............................................................................................... 21
8.5.4. KA8140/KA8141 connection to C5 zone...................................................................................... 22
8.5.5. KA8243 KA8245 connection to C5............................................................................................... 22
8.5.6. KA8243/KA8245 connection to C5 zone...................................................................................... 22
8.6. Malfunction, Error Code and Solving steps.............................................................................................. 23
8.6.1. E1 solving step--communication error with outdoor unit .............................................................. 24
8.6.2. E2 – temp sensor malfunction...................................................................................................... 25
8.6.3. Ed – outdoor unit malfunction....................................................................................................... 25
8.7. Dimensions .............................................................................................................................................. 26
8.7.1. KA8140/KA814............................................................................................................................. 26
8.7.2. KA8243/KA8245........................................................................................................................... 26

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4
1. SAFETY PRECAUTIONS
Read Safety Precautions Before Installation
Incorrect installation due to ignoring instructions can cause serious damage or injury. The seriousness of po-
tential damage or injuries is classied as either a WARNING.
Failure to observe a warning may result in death. The appliance must be
installed in accordance with national regulations. Failure to observe a
caution may result in injury or equipment damage.
• Carefully read the Safety Precautions before installation.
• Only trained and certied technicians should install, repair and ser-
vice this air conditioning unit. Improper installation may result in elec-
trical shock, short circuit, leaks, re or other damage to the equip-
ment and personal property.
• Strictly follow the installation instructions set forth in this manual. Im-
proper installation may result in electrical shock, short circuit, leaks,
re or other damage to the equipment.
• Before you install the unit, consider strong winds, typhoons and
earthquakes that might a󰀨ect your unit and locate it accordingly.
Failure to do so could cause the equipment to fail.
• After installation, ensure there are no refrigerant leaks and that the
unit is operating properly. Refrigerant is both toxic and flammable
and poses a serious health and safety risk.
Note about Fluorinated Gasses
1. This unit contains fluorinated gasses. For specic information on the type of gas and the amount, please
refer to the relevant label on the unit itself.
2. Installation, service, maintenance and repair of this unit must be performed by a certied technician.
3. Product uninstallation and recycling must be performed by a certied technician.
4. If the system has a leak-detection system installed, it must be checked for leaks at least every 12 months.
5. When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.

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MOU2-20-03 5
Fig. 2.1 Fig. 2.2
2. OUTDOOR UNIT INSTALLATION
2.1. Outdoor Unit Installation Instructions
Step 1: Select installation location.
The outdoor unit should be installed in the location that meets the following requirements:
• Place the outdoor unit as close to the indoor unit as possible.
• Ensure that there is enough room for installation and maintenance.
• The air inlet and outlet must not be obstructed or exposed to strong wind.
• Ensure the location of the unit will not be subject to snowdrifts, accumulation of leaves or other seasonal
debris. If possible, provide an awning for the unit. Ensure the awning does not obstruct airflow.
• The installation area must be dry and well ventilated.
• There must be enough room to install the connecting pipes and cables and to access them for maintenance.
• The area must be free of combustible gases and chemicals.
• The pipe length between the outdoor and indoor unit may not exceed the maximum allowable pipe length.
• If possible, DO NOT install the unit where it is exposed to direct sunlight.
• If possible, make sure the unit is located far away from your neighbors’ property so that the noise from the
unit will not disturb them.
• If the location is exposed to strong winds (for example: near a seaside), the unit must be placed against the
wall to shelter it from the wind. If necessary, use an awning. (See Fig. 2.1 & 2.2)
• Install the indoor and outdoor units, cables and wires at least 1 meter from televisions or radios to prevent
static or image distortion. Depending on the radio waves, a 1 meter distance may not be enough to eliminate
all interference.
Step 2: Install outdoor unit.
Fix the outdoor unit with anchor bolts (M10)
5
Outdoor Units
Outdoor unit installation
Cautions
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outdoor unit. ( Refer to chart 16)
 Locate the outdoor unit as close to the indoor unit as possible.
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chart does not mean that the same is applicable to the situation of an airtight. Leave open
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Necessary room for installation and maintenance
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of air circulation.
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Chart 1
6WURQJZLQG
Wall or obstacle
Air inlet
Air inlet
>30 cm
>60 cm
C
Air outlet
>200 cm
A
>30 cm
Chart 2
Maintain channel
Chart 3
>60 cm
1HFHVVDU\ZLGWK
)L[ZLWKEROW
Deep foundation
Fig. 2.3
• Be sure to remove any obstacles that may block air circulation.
• Make sure you refer to Length Specications to ensure there is
enough room for installation and maintenance.

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MOU2-20-03
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Split Type Outdoor Unit
(Refer to Fig 3.4, 3.5, 3.6, 3.7)
W
H
Fig. 2.4
W
H
Fig. 2.5
A
B
D
Fig. 2.6

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MOU2-20-03 7
Model Outdoor unit dimensions
W × D × H
Mounting Dimensions, mm
Distance A Distance A
MOU-12HFN8 800x333x554 514 340
MOU-18HFN8 800x333x554 514 340
MOU-24HFN8 845x363x702 540 350
MOU-36HFN8 946x410x810 673 403
MOU-48HFN8 952x410x1333 634 403
MOU-55HFN8 952x410x1333 634 404
NOTE: The minimum distance between the outdoor unit and walls described in the installation guide does not
apply to airtight rooms. Be sure to keep the unit unobstructed in at least two of the three directions (M, N, P)
(See Fig. 2.7).
200 cm / 78” in front
30 cm / 11.8” on left
60 cm / 23.6” above
30 cm / 11.8” from back wall
60 cm / 23.6” on right
M
N
P
Fig. 2.7
Drain Joint Installation
Before bolting the outdoor unit in place, you must install the drain joint at the bottom of the unit (See Fig. 2.8).
1. Fit the rubber seal on the end of the drain joint that will connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of the unit.
3. Rotate the drain joint 90° until it clicks in place facing the front of the unit.
4. Connect a drain hose extension (not included) to the drain joint to redirect water from the unit during heating
mode.
NOTE: Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard.
Base pan hole
of outdoor unit
Seal
Seal
Drain joint
(A) (B)
Fig. 2.8

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3. REFRIGERANT PIPING CONNECTION
Safety Precautions
• All eld piping must be completed by a licensed technician and must
comply with the local and national regulations.
• When the air conditioner is installed in a small room, measures must
be taken to prevent the refrigerant concentration in the room from
exceeding the safety limit in the event of refrigerant leakage. If the re -
frigerant leaks and its concentration exceeds its proper limit, hazards
due to lack of oxygen may result.
• When installing the refrigeration system, ensure that air, dust, mois-
ture or foreign substances do not enter the refrigerant circuit. Con-
tamination in the system may cause poor operating capacity, high
pressure in the refrigeration cycle, explosion or injury.
• Ventilate the area immediately if there is refrigerant leakage during
the installation. Leaked refrigerant gas is both toxic and flammable.
Ensure there is no refrigerant leakage after completing the installa-
tion work.
3.1. Notes On Pipe Length and Elevation
Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and
outdoor units meets the requirements.
3.2. Refrigerant Piping Connection Instructions
• DO NOT install the connecting pipe until both indoor and outdoor
units have been installed.
• Insulate both the gas and liquid piping to prevent water leakage.
Step1: Cut pipes
When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efcient
operation and minimize the need for future maintenance.
1. Measure the distance between the indoor and outdoor units.
2. Using a pipe cutter, cut the pipe a little longer than the measured distance.
• DO NOT deform pipe while cutting. Be extra careful not to damage,
dent, or deform the pipe while cutting. This will drastically reduce the
heating efciency of the unit.
Make sure that the pipe is cut at a perfect 90° angle. Refer to Fig. 3.1 for examples of bad cuts.
Oblique Rough Warped
90°
Fig. 3.1

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MOU2-20-03 9
Step 2: Remove burrs.
Burrs can a󰀨ect the air-tight seal of refrigerant piping connection. They must be completely removed.
1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all burrs from the cut section of the pipe.
Point down
Pipe
Reamer
Fig. 3.2
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal.
1. After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering
the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make sure they are facing in the right direction, because you can’t put
them on or change their direction after flaring. See Fig. 3.3.
Flare nut
Copper pipe
Fig. 3.3
4. Remove PVC tape from ends of pipe when ready to perform flaring work.
5. Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the flare form.
Flare form
Pipe
Fig. 3.4
6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool clockwise until the pipe is fully flared. Flare the pipe in accordance with
the dimensions shown in table 3.1.

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Table 3.1. PIPING EXTENSION BEYOND FLARE FORM
Pipe gauge Tightening torque
Flare dimension (A)
(Unit: mm/Inch) Flare shape
Min. Max.
Ø 6.4 14.2-17.2 N.m
(144-176 kgf.cm) 8.3 8.7
90 ± 4
45 ± 2
A
R0.4~0.8
Fig. 3.5
Ø 9.5 32.7-39.9 N.m
(333-407 kgf.cm) 12.0 12.4
Ø 12.7 49.5-60.3 N.m
(504-616 kgf.cm) 15.4 15.8
Ø 15.9 61.8-75.4 N.m
(630-770 kgf.cm) 18.6 19.1
Ø 19.1 97.2-118.6 N.m
(990-1210 kgf.cm) 22.9 23.3
Ø 22 109.5-133.7 N.m
(1117-1364 kgf.cm) 27 27.3
8. Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring.
Check to make sure there is no refrigerant leak after completing the in-
stallation work. If there is a refrigerant leak, ventilate the area immedi-
ately and evacuate the system (refer to the Air Evacuation section of
this manual).

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4. PIPING DIAGRAMS
MOU-12HFN8, MOU-18HFN8, MOU-24HFN8
MOU-36HFN8, MOU-48HFN8, MOU-55HFN8

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5. WIRING
Safety Precautions
• Be sure to disconnect the power supply before working on the unit.
• All electrical wiring must be done according to local and national
regulations.
• Electrical wiring must be done by a qualied technician. Improper
connections may cause electrical malfunction, injury and re.
• An independent circuit and single outlet must be used for this unit.
DO NOT plug another appliance or charger into the same outlet. If
the electrical circuit capacity is not enough or there is a defect in the
electrical work, it can lead to shock, re, unit and property damage.
• Connect the power cable to the terminals and fasten it with a clamp.
An insecure connection may cause re.
• Make sure that all wiring is done correctly and the control board cov-
er is properly installed. Failure to do so can cause overheating at the
connection points, re, and electrical shock.
• Ensure that main supply connection is made through a switch that
disconnects all poles, with contact gap of a least 3 mm (0.118”).
DO NOT modify the length of the power cord or use an extension cord.
• Connect the outdoor wires before connecting the indoor wires.
• Make sure you ground the unit. The grounding wire should be away from gas pipes, water pipes, lightning
rods, telephone or other grounding wires. Improper grounding may cause electrical shock.
DO NOT connect the unit with the power source until all wiring and piping is completed.
• Make sure that you do not cross your electrical wiring with your signal wiring, as this can cause distortion
and interference.
Follow these instructions to prevent distortion when the compressor starts:
• The unit must be connected to the main outlet. Normally, the power supply must have a low output imped-
ance of 32 ohms.
• No other equipment should be connected to the same power circuit.
• The unit’s power information can be found on the rating sticker on the product.

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MOU2-20-03 13
5.1. Outdoor Unit Wiring
Before performing any electrical or wiring work, turn o󰀨 the main power
to the system.
1. Prepare the cable for connection
a. You must rst choose the right cable size before preparing it for connection. Be sure to use H07RN-F
cables.
Table 5.1. Minimum Cross-Sectional Area of Power and Signal Cables North America
Rated Current
of Appliance (A) AWG
≤ 7 18
7 - 13 16
13 - 18 14
18 - 25 12
25 - 30 10
Table 5.2: Other Regions
Rated Current
of Appliance (A) AWG
≤ 6 0.75
6 - 10 1
10 - 16 1.5
16 - 25 2.5
25- 32 4
32 - 45 6
b. Using wire strippers, strip the rubber jacket from both ends of signal cable to reveal about 15 cm (5.9”)
of the wires inside.
c. Strip the insulation from the ends of the wires.
d. Using a wire crimper, crimp u-lugs on the ends of the wires.
NOTE: While connecting the wires, please strictly follow the wiring diagram (found inside the electrical box
cover).
2. Remove the electric cover of the outdoor unit. If there is no cover on the outdoor unit, disassemble the bolts
from the maintenance board and remove the protection board. (See Fig. 5.1)
Cover
Screw
Fig. 5.1
3. Connect the u-lugs to the terminals Match the wire colors/labels with the labels on the terminal block, and
rmly screw the u-lug of each wire to its corresponding terminal.
4. Clamp down the cable with designated cable clamp.
5. Insulate unused wires with electrical tape. Keep them away from any electrical or metal parts.
6. Reinstall the cover of the electric control box.

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6. AIR EVACUATION
Safety Precautions
• Use a vacuum pump with a gauge reading lower than -0.1MPa and an air discharge capacity above 40L/min.
• The outdoor unit does not need vacuuming. DO NOT open the outdoor unit’s gas and liquid stop valves.
• Ensure that the Compound Meter reads -0.1MPa or below after 2 hours. If after three hours of operation and
the gauge reading is still above -0.1MPa, check if there is a gas leak or water inside the pipe. If there is no
leakage, perform another evacuation for 1 or 2 hours.
• DO NOT use refrigerant gas to evacuate the system.
6.1. Evacuation Instructions
Before using manifold gauge and vacuum pump, read their operation manuals to familiarize yourself with how
to use them properly.
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
Charge hose
Low pressure valve
Vacuum pump
Charge hose
High pressure valve
Pressure gauge
Fig. 6.1
1. Connect the charge hose of the manifold gauge to service port on the outdoor unit’s low pressure valve.
2. Connect another charge hose from the manifold gauge to the vacuum pump.
3. Open the Low Pressure side of the manifold gauge. Keep the High Pressure side closed.
4. Turn on the vacuum pump to evacuate the system.
5. Run the vacuum for at least 15 minutes, or until the Compound Meter reads -76cmHG (-1x105Pa).
6. Close the Low Pressure side of the manifold gauge, and turn o󰀨 the vacuum pump.
7. Wait for 5 minutes, then check that there has been no change in system pressure.
NOTE: If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve).
If there is a change in system pressure, there may be a gas leak.
8. Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning the
wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve after 5 sec-
onds.
Flare nut
Cap
Valve stem
Valve body
Fig. 6.2

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MOU2-20-03 15
9. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The Pressure
Gauge should read slightly higher than atmospheric pressure.
10. Remove the charge hose from the service port.
11. Using hexagonal wrench, fully open both the high pressure and low pressure valves.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it hits against the stopper.
DO NOT try to force the valve to open further.
12. Tighten valve caps by hand, then tighten it using the proper tool.
6.2. Note On Adding Refrigerant
• Refrigerant charging must be performed after wiring, vacuuming and the leak test.
• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system. Doing so can
damage or impact the unit’s function.
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the appropriate re-
frigerant is used.
• Refrigerant containers must be opened slowly. Always use protective gear when charging the system.
• DO NOT mix refrigerants types.
Some systems require additional charging depending on pipe lengths L (m).
Pipe diameter, mm Ø 6,35 Ø 9,52
Additional refrigerant volume, g 15x(L-5) 30x(L-5)
The standard pipe length varies according to local regulations.

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Model MOU-12HFN8 MOU-18HFN8 MOU-24HFN8 MOU-36HFN8 MOU-48HFN8 MOU-55HFN8
Cooling capacity, kW 3.52
(1.52~5.28)
5.28
(2.90~5.74)
7.03
(3.22~8.21)
10.55
(4.04~12.02)
14.07
(4.75~14.58)
15.53
(5.28~16.71)
EER 4.14 3.23 3.21 2.67 2.74 2.61
SEER 7.8 6.1 6.1 6.1 6.1 6.1
Energy E󰀩ciency
Class A++ A++ A++ A++ A++ A++
Heating capacity, kW 4.40
(1.03~5.57)
5.42
(2.37~6.10)
7.62
(2.43~8.65)
11.14
(2.95~14.14)
16.12
(3.93~16.77)
18.17
(4.4~19.34)
COP 4.00 3.71 3.72 3.71 3.19 3.01
SCOP 4.6 4.0 4.0 4.0 4.0 4.0
Energy E󰀩ciency
Class A++ A+ A+ A+ A+ A+
Max. input
consumption, W 2350 2950 2950 5600 6200 7500
Max. input current, A 10 13.5 13.5 10.0 11.2 14
Power supply,
Ph, V, Hz
1Ph, 220-240V,
50Hz
1Ph, 220-240V,
50Hz
1Ph, 220-240V,
50Hz
3Ph, 380-415V,
50Hz
3Ph, 380-415V,
50Hz
3Ph, 380-415V,
50Hz
Wiring, # x mm² 3 x 1,0 3 x 1,0 3 x 2,5 5 x 2,5 5 x 2,5 5 x 2,5
Compressor type Rotary Rotary Rotary Rotary Rotary Rotary
Compressor model ZKFN-40-8-1L-5 ZKFN-34-8-1-3 ZKFN-50-8-2 ZKFN-120-8-2 ZKFN-85-8-22 ZKFN-85-8-22-2
Compressor
capacity, W 3465 4385 7649 10010 13675 13675
Refrigerant oil/oil
charge, ml VG74/350 VG74 /440 ESTEL OIL RB74AF/670 VG74/1000 1400 1400
Outdoor air flow, m³/h 2000 2000 2700 4000 7500 7500
Outdoor noise level
(sound pressure),
dB(A)
55 55 62 64 66 66
Outdoor dimension
(WxDxH), mm 800x333x554 800x333x554 845x363x702 946x410x810 952x415x1333 952x415x1333
Outdoor packing
(WxDxH), mm 920x390x625 92x390x625 965x395x775 1090x500x885 1095x495x1480 1095x495x1480
Outdoor Net / Gross
weight, kg 34.7/37.5 33.7/36.6 49.4/52.8 81.5/87.0 106.7/119.9 111.3/124.3
Refrigerant type R32 R32 R32 R32 R32 R32
GWP 675 675 675 675 675 675
Refrigerant charged
volume, kg 0.87 1.15 1.5 2.4 2.8 2.95
Design pressure, MPa 4.3/1.7 4.3/1.7 4.3/1.7 4.3/1.7 4.3/1.7 4.3/1.7
Refrigerant piping
Liquid side / Gas side,
mm Ø6.35/Ø9.52 Ø6.35/Ø12.7 Ø9.52/Ø15.9 Ø9.52/Ø15.9 Ø9.52/Ø15.9 Ø9.52/Ø15.9
Liquid side –
Gas side, inch 1/4”/3/8” 1/4”/1/2” 3/8”/5/8” 3/8”/5/8” 3/8”/5/8” 3/8”/5/8”
Max. pipe length, m 25 30 50 65 65 65
Max. di󰀨erence
in level, m 10 20 25 30 30 30
Ambient temp.
cooling, °C -15~50 -15~50 -15~50 -15~50 -15~50 -15~50
Ambient temp.
heating, °C -15~24 -15~24 -15~24 -15~24 -15~24 -15~24
7. OUTDOOR UNIT SPECIFICATIONS

UAB KOMFOVENT we reserve the right to make changes without prior notice.
MOU2-20-03 17
8.AHU KIT SPECIFICATIONS KA8140/8141, KA8243/8245
8.1. Introduction
KA8140/KA8141, KA8243/KA8245 control module enables to control inverter type outdoor unit without the
needs of air conditioner factory produced indoor unit. It gives possibility to control outdoor unit capacity and
state to produce heator cooling for AHU or water heater/cooler.
KA8140/KA8141, KA8243/KA8245 control module enables to control inverter condensing unit capacity
0-10%~100% by external input 0~10VDC signal.
Dry contact signal is used to control outdoor unit to work in cooling or heating mode.
KA8243 do not have temp sensor and anti-frozen protection must be from AHU controller or water heater/
cooler controller.
KA8140/KA8141, KA8245 have temp sensor and provide evaporator anti-frozen protection.
The installation and operation of outdoor unit as well controller must be done according to the manuals
(i.e. User’s manual, Installation manual, Technical Specication, Service Manual).
8.2. Specication and packing list
Model KA8140/KA8141 KA8243/KA8245
Casing Plastic Plastic
Dimension (h × w × d) 61 x 100 x 191 mm 45 × 100 × 191 mm
Weight 0.4 KG 0.35 KG
Operation Temperature Range -25 °C ~ +45 °C -25°C ~ +45 °C
Operation Humidity Range 40 - 90 % 40-90 %
Power Supply 230 VAC, 1 Phase, 50/60Hz 230 VAC, 1 Phase, 50/60 Hz
Voltage Range 208 - 240V 208-240 V
Fuse 15 A, 250 V 15 A, 250 V
Resistance class IP54 IP54
Packing list
Box body 1 piece 1 piece
Box cover 1 piece 1 piece
Anti-water seal between box body and box cover 1 piece 1 piece
Temp sensor 1 piece 1 piece (for KA8245 only)
Gland 3 pieces 3 pieces
Manual 1 piece 1 piece

EN
UAB KOMFOVENT we reserve the right to make changes without prior notice.
MOU2-20-03
18
8.3. System design
AHU KIT
AHU CONTROLLER
Signal
communication with
outdoor unit
Power supply 230 V
Temp Sensor for
KA8140/KA8141/
KA8245
Heat exchanger
refrigerant pipes
Alarm
Defrost
cooling
heating
0-10 V
KA8140/KA814,
KA8243/KA8245
L N
8.4. Function and Setting
8.4.1. KA8140/KA8141
ALARML N S DEFROST
L
N
AHU KIT
OUTDOOR UNIT
Communication with outdoor unit
Power supply 240AC
FUSE: T2A/250VAC
Capacity input
0...10 VDC
Heating input
digital
Cooling input
digital
Alarm output
5A/250VAC
5A/30VDC
Defrost output
5A/250VAC
5A/30VDC
CONTROLLER PCB
Heat LED
Cool LED
Def. LED
L1(W) NS
ENC1
TEMP1
CN2
T2 Evaporator
Coil Temp
Sensor
CN1
HEAT
+ – COOL

UAB KOMFOVENT we reserve the right to make changes without prior notice.
MOU2-20-03 19
8.4.2. KA8243/KA8245
TEMP1
0-10V
PIPE TEMP
SENSOR
AHU KIT
OUTDOOR UNIT
Digital
Input
Cooling
Mode
Digital
Input
Heating
Mode
Run led
Heat led
Cool led
Def. led
ENC1
(power setting)
Power setting:
Fuse 15A, 250V
Code:
Model:
0
53 71 90 105 140 160 200
1 2 3 4 5 6-F
Alarm Defrost
Alarm
output
5A-250VAC
5A-30VDC
Defrost
output
5A-250VAC
5A-30VDC
TEMP1
PIPE TEMP
SENSOR
Communication
BUS
2-core shielded
2 x 0.5mm2
0-10VDC
Capacity
input
(max 10VDC)
Power supply
E Q P L1 L2 L3 N
N L
N
L1
L2
L3
400V, 50H, 3Ph+T
Connection Terminal Introduction:
N, L – Power supply connection terminal 230V,1-phase, 50/60Hz.
ALARM – Digital output 5A-250VAC or 5A-30VDC. When outdoor unit has malfunction signal is activated.
DEFROST – Digital output 5A-250VAC or 5A-30VDC. When outdoor unit is in defrost mode is activated.
PQ – Terminal to communication cable between controller and outdoor unit. Should not be less than
2×0,5mm2 (shielded) (KA8243/KA8245).
S – Communication between controller and outdoor unit (KA8140/KA8141).
Di󰀨erent outdoor units may have di󰀨erent signal terminal. Please refer tofollowing connection:
E Q P S1 SS2
Q P Q SP
Outdoor unit
terminal
PCB
terminal
Outdoor unit
terminal
Outdoor unit
terminal
PCB
terminal
PCB
terminal
Remark: If S1-Q/S2-P does not work,
then change it to S1-P/S2-Q.
TEMP1 – Anti-frozen protection sensor terminal (for KA8140/KA8141, KA8245). Please know that temp
sensor must be placed at middle of heat changer.
0-10V – Analog input terminal to control outdoor unit capacity.

EN
UAB KOMFOVENT we reserve the right to make changes without prior notice.
MOU2-20-03
20
Capacity steps:
0-0.5 V 0% (unit stopped)
0.5-1.5 V, 10 % capacity (LED display digit 1)
1.5-2.5 V, 20 % capacity (LED display digit 2)
2.5-3.5 V, 30 % capacity (LED display digit 3)
3.5-4.5 V, 40 % capacity (LED display digit 4)
4.5-5.5 V, 50 % capacity (LED display digit 5)
5.5-6.5 V, 60 % capacity (LED display digit 6)
6.5-7.5 V, 70 % capacity (LED display digit 7)
7.5-8.5 V, 80 % capacity (LED display digit 8)
8.5-9.5 V, 90 % capacity (LED display digit 9)
9.5-10.5V, 100% capacity (LED display digit 10)
Negative(0/-) and Positive(10/+) terminals can not be mixed, otherwise it
may destroy this control module. Signal input can not exceed 10.5VDC,
otherwise it may destroy this control module.
COOL – Digital input. When terminals are closed, the unit will run in cooling mode and “COOL” LED will be on.
HE AT – Digital input. When terminals are closed, the unit will run in heating mode and “HEAT” LED will be on.
NOTE: HEAT signal has the priority. If both COOL and HEAT terminals are closed, unit will run in HEAT mode.
ENC1 (KA8140/KA8141) – knob for multi split connection to select indoor unit capacity.
This knob is for multi indoor units connection only.
This knob will not work at one indoor to one outdoor connection.
Knob selection Indoor unit capacity Knob selection Indoor unit capacity
02,0 kW unit 67,1 kW unit
12,6 kW unit 79,0 kW unit
23,2kW unit 810,5 kW unit
33,5 kW unit 914,0 kW unit
45,3 kW unit A - F 16,0 kW unit
57,1 kW unit
ENC1 (KA8243/KA8245) – knob to select condensing unit model.
Knob selection Condensing unit Knob selection Condensing unit
05,3 kW unit 310,5 kW unit
17,1 kW unit 414,0 kW unit
29,0 kW unit 516,0 kW unit
LED lamps introduction:
RUN LED is lightened when controller is powered on.
HEAT LED is lightened when the unit is operating in heating mode.
COOL LED is lightened when the unit is operating in cooling mode.
DEF LED is lightened when the unit is in defrost mode.