LG THERMA V AHNW16606B0 User manual

SERVICE MANUAL
P/NO : MFL69717001
AIR-TO-WATER
HEAT PUMP
www.lg.com
Before servicing the unit, read the safety precautions in general SVC manual.
Only for authorized service personnel.
GENERAL
CONFIDENTIAL
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

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1. General...........................................................................................................................................3
2. Specification ...................................................................................................................................8
3. Function Table ..............................................................................................................................13
4. Pump Hydraulic Performance.......................................................................................................14
5. Piping Diagrams ...........................................................................................................................15
6. Wiring Diagrams...........................................................................................................................16
7. Exploded View..............................................................................................................................21
8. Model Information.........................................................................................................................29
9. Replacement Procedure for Compressor.....................................................................................31
10. Caution for Assembling Outdoor Panels after Test Run.............................................................32
11. Trouble shooting Guide (Indoor Unit) .........................................................................................33
12. Trouble shooting Guide (Outdoor Unit) ......................................................................................40
Content

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The manual describes the process of setting up and use of the device. Servicing and maintenance
of the device can only be performed by qualified personnel. Read the manual carefully before
working on the device, this way you will be informed about the intended use, functionality and
process of troubleshooting the device.
Definitions
• An informed person is a person who reads this manual.
• A qualified person has a certificate of expert qualifications.
• An authorised commission contractor is trained by the manufacturer and authorised to perform
commission.
• The authorised technician is trained and authorised by the manufacturer to perform maintenance
and servicing of the device.
• The user uses the device according to its use.
• The installer is a person professionally trained for performing hardware and/or electro-installation
work and mounting of the device.
Incorrect use of the device can lead to damage of the device, property or injury to the user or main-
tenance worker. To reduce risk the manual points out important information with the use of sym-
bols.
1.1 Symbol
1. General
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
nIncorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
nMeanings of symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
Be sure not to do.
Be sure to follow the instruction.

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1.3 Safety warnings and instructions
WARNING
Installation
• Ask the dealer or an authorized technician to install the air conditioner.
- Improper installation by the user may result in water leakage, electric shock, or fire.
• Take care to ensure that nobody could step on or fall onto the outdoor unit.
- This could result in personal injury and product damage.
• Always ground the product.
- There is risk of fire or electric shock.
• Always intstall a dedicated circuit and breaker.
- Improper wiring or installation may cause fire or electric shock.
• For re-installation of the installed product, always contact a dealer or an Authorized
Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install, remove, or re-install the unit by yourself (customer).
- There is risk of fire, electric shock, explosion, or injury.
• Do not store or use flammable gas or combustibles near the air conditioner.
- There is risk of fire or failure of product.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Before beginning the service procedure, it is necessary to read the service manual.
• The installation of the device has to be performed in accordance with the manual; otherwise the
manufacturer does not acknowledge the warranty.
• Any remaking or replacement of original components of the device eliminates the manufacturer’s
guarantee for safe and functional operation. In the case of undesignated and incorrect use of the
device, the manufacturer is not responsible for the consequences and will not acknowledge claims for
damages in these cases. The user is solely responsible for injuries and damages on the device itself or
on other objects resulting from undesignated and incorrect use of the device.
• Failure to comply with the manual and good practise while connecting the device to the power supply
can lead to serious injury or death.
• Connecting the device to the power source can only be performed by a qualified installer.
NOTE
WARNING
1.2 General

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• Prepare for strong wind or earthquake and install the unit at the specified place.
- Improper installation may cause the unit to topple and result in injury.
• Do not install the product on a defective installation stand.
- It may cause injury, accident, or damage to the product.
• When installing and moving the air conditioner to another site, do not charge it with a
different refrigerant from the refrigerant specified on the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle
may malfunction and the unit may be damaged.
• Do not reconstruct to change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted and operated
forcibly, or parts other than those specified by LGE are used, fire or explosion may result.
• Ventilate before operating air conditioner when gas leaked out.
- It may cause explosion, fire, and burn.
• Securely install the cover of control box and the panel.
- If the cover and panel are not installed securely, dust or water may enter the outdoor unit
and fire or electric shock may result.
Operation
• Do not damage or use an unspecified power cord.
- There is risk of fire, electric shock, explosion, or injury.
• Use a dedicated outlet for this appliance.
- There is risk of fire or electrical shock.
• Be cautious that water could not enter the product.
- There is risk of fire, electric shock, or product damage.
• Do not touch the power switch with wet hands.
- There is risk of fire, electric shock, explosion, or injury.
• When the product is soaked (flooded or submerged), contact an Authorized Service
Center.
- There is risk of fire or electric shock.
• Be cautious not to touch the sharp edges when installing.
- It may cause injury.

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Installation
• Always check for gas (refrigerant) leakage after installation or repair of product.
- Low refrigerant levels may cause failure of product.
• 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.
• Keep level even when installing the product.
- To avoid vibration or water leakage.
• Do not install the unit where combustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion may result.
• Use power cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a fire.
• 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 refrigeration system.
- There is risk of damage or loss of property.
• Keep the unit away from children. The heat exchanger is very sharp.
- It can cause the injury, such as cutting the finger. Also the damaged fin may result in
degradation of capacity.
• When installting the unit in a hospital, communication station, or similar place, provide
sufficient protection against noise.
- The inverter equipment, private power generator, high-frequency medical equipment, or
radio communication equipment may cause the air conditioner to operate erroneously, or
fail to operate. On the other hand, the air conditioner may affect such equipment by
creating noise that disturbs medical treatment or image broadcasting.
• Do not install the product where it is 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.
Operation
• Do not use the air conditioner in special environments.
- Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the air
conditioner or damage its parts.
• Do not block the inlet or outlet.
- It may cause failure of appliance or accident.
• Make the connections securely so that the outside force of the cable may not be applied to
the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
CAUTION

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• 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, or personal injury.
• Install and insulate the drain hose to ensure that water is drained away properly based on
the installation manual.
- A bad connection may cause water leakage.
• Be very careful about product transportation.
- Only one person should not carry the product if it weighs more than 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands for a means of
transportation. It is dangerous.
- Do not touch the heat exchanger fins. Doing so may cut your fingers.
- When transporting the outdoor unit, suspending it at the specified positions on the unit
base. Also support the outdoor unit at four points so that it cannot slip sideways.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts, may cause stabs or
other injuries.
- Tear apart and throw away plastic packaging bags so that children may not play with
them. If children play with a plastic bag which was not torn apart, they face the risk of
suffocation.
• Turn on the power at least 6 hours before starting operation.
- Starting operation immediately after turning on the main power switch can result in
severe damage to internal parts. Keep the power switch turned on during the operational
season.

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2. Specification
Indoor
Indoor unit AHNW16606B0 /HN1616T NB0
Version
Controller TT3000 (MD1)
Device placement Indoor
Electrical data
1f connection of the internal unit 2)
Frequency Hz 50
Rated voltage V ~ 230
Max. operational current A 11.1
Max. electrical power kW 2.52
Fuses 6) A 1 x C16
Electrical power cable 1) mm23 x 4
Electric heater 1 x 2 kW ~ 230 V
3f connection of the internal unit 2)
Frequency Hz 50
Rated voltage V 3N ~ 400
Max. operational current A 11.1
Max. electrical power kW 6.52
Fuses 6) A 3 x C16
Electrical power cable 1) mm25 x 2.5
Electric heater 3 x 2 kW ~ 230 V
Max. external electric power 2) W500
Cooling system
Max. operational pressure MPa 5,0
Refrigerant Pipe c onnections
Pipe connection of the liquid pipe
3/8''
Pipe connection of the gas pipe 5/8''
Primary side (heat source) - air
Heating and cooling
Range of operation -
min. / max. air temperature °C Depending on the external air - water unit
Secondary side (heat sink) - water
Min. / Max. pressure in the system MPa 0,05 / 0,3 (0,5 / 3 bar)
Recommended dimensions of
pipes of the device 4) DN 25
Heating
Rated flow 3) m3 / h Min 1 m3/h
Pressure drop at rated flow kPa 10
Range of operation -
min. / max. water temperature °C 25 / 58
Cooling
Range of operation -
min. / max. water temperature °C 7 / 25
Pipe connections for the water connection
Return line system R1’’ (ext. u.)
Supply line system R1’’ (ext. u.)
DHW – hot water connection R1’’ (ext. u.)
DHW – cold water connection R3/4’’ (ext. u.)
Volume
DHW Tank l 200
Buffer tank l 40
Dimensions and mass
Dimensions (W x H x D) mm 607 x 2045 x 725
Transport mass kg 238
Net mass kg 228
Noise
Level of sound power dB (A) 36
Level of sound pressure at a
distance of 1 m dB (A) 27
Communication
Connect ion between outdoor and
indoor unit 3 x 0.75 mm 2
Connection to CNS MODBUS protocol (UTP cable – connection RJ45) – RS 485
Connection to the internet 5) UTP cable - connection RJ45 - Ethernet
Miscellaneous
Protection class – indoor unit IPX1
19.9
4.52
1 x C20
3 x 4
2 x 2 kW ~ 230 V

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Note :
1) With the cable we have taken into account laying B2 from the table A.52.4 – IEC 60364-5-52. The cable in the installation pipe is fixed to the wall.
The dimensions of the electrical cables must always be checked or determined by the designing engineer of electrical installations.
2) Joint maximal load (circulation pumps, electronic valves ...) which can be connected to or powered by the internal unit, must not exceed the specified
value. Higher consumers (i.e. pumps) should have their own supply.
3) The circulation pump must be dimensioned in such a way that it ensures rated flow through the device.
4) This is true for pipe connections of suitable dimensions and joint distance of up to 20m. Pipe dimensions and types of pumps must always be verified or
determined by the designing engineer of electrical installations. Circulation pumps must be dimensioned in such a way so as to ensure rated voltage (see
table) through the device.
5) Connection to the internet is not necessary for the operation of the device but it is necessary for remote control through the Home Cloud service.
It is also advisable for faster troubleshooting of the device’s operation.
6) The size of the fuse depends on the choice of the connection power of the electrical heater.

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Outdoor
Outdoor Units AHUW146A2 AHUW096A3
Combination Indoor Units AHNW16606B0 AHNW16606B0
Power Supply Ø / V / Hz 1/220-240/50 1 / 220-240 / 50
Maximum Running Cooling A 25 19
Current Heating A 25 19
Wiring Connections
For Power Supply
(Included Earth)
Number of wires 3 3
* Capacity
Cooling(Under floor) kW 11.0
Heating(Under floor) kW 14.0
* Power Input
Cooling(Under floor) kW 3.04
Heating(Under floor) kW 3.16
*EER Cooling(Under floor) W/W 3.61
*COP Heating(Under floor) W/W 4.44
Operation Range (Min.~Max.)
Outdoor Temperature
Cooling °C DB 5 ~ 48
Heating °C DB -20 ~ 30
Compressor
Type - Hermetic Motor
Model - GPT442MBA
Quantity EA 1
Displacement cm3/Rev. 44.2
Capacity kW 13.92
Compressor Motor
Type - Brushless
Quantity EA 1
Rated Output W 4,000
Refrigerant
Type - R410A
Charge g 2,300
Control - Electronic Expansion Valve
Refrigerant Oil
Type - FVC68D
Charged Volume cc 1,300
Heat Exchanger
Quantity EA 2
Rows EA 2
Columns EA 32
FPI Fins/inch 14
Fan
Type - Propeller
Quantity EA 2
Air Flow Rate CMM(l/s) 55
Fan Motor
Model - BLDC
Quantity EA 2
Output W 124
Sound Power Level Heating dB 69
Liquid Piping Connection
Type - Flare
Outer Diameter mm(inch) Ø 9.52 (3/8)
Gas Piping Connection
Type - Flare
Outer Diameter mm(inch) Ø 15.88 (5/8)
Piping Length (Outdoor Unit ~
Indoor Unit)
Minimum m 3
Standard m 7.5
Maximum m 50
Height Difference (Outdoor
Unit ~ Indoor Unit)
Maximum m 30 30
Additional Refrigerant Charge g/m 40
Dimensions
Unit(W x H x D) mm 950 x 1,380 x 330
Packed Unit(W x H x D) mm 1,140 x 1,462 x 461
Weight
Unit kg 94
Packed Unit kg 107
**Rated water flow rate LPM 40
9.0
9.0
2.88
2.23
3.12
4.04
5 ~ 48
-20 ~ 30
Hermetic Motor
GJT240MAA
1
24
7.41
Brushless
1
2,137
R410A
1,800
EEV
FVC68D
900
1
2
38
14
Propeller
1
58
BLDC
1
124
65
Flare
Ø 9.52 (3/8)
Flare
Ø 15.88 (5/8)
3
7.5
50
40
950 × 834 × 330
1,065 × 918 × 461
59
65
26
Note :
1. Capacities and power inputs are based on the following conditions:
* : Cooling conditions - Indoor Water Temperature 23°C/18°C; Outdoor Air Temperature 35°CDB/24°CWB
Heating conditions - Indoor Water Temperature 30°C/35°C; Outdoor Air Temperature 7°CDB/6°CWB
Standard piping length 7.5m
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose of improvement.
4. ** Indoor unit Rated water flow rate.

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Note :
1. Capacities and power inputs are based on the following conditions:
* : Cooling conditions - Indoor Water Temperature 23°C/18°C; Outdoor Air Temperature 35°CDB/24°CWB
Heating conditions - Indoor Water Temperature 30°C/35°C; Outdoor Air Temperature 7°CDB/6°CWB
Standard piping length 7.5m
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose of improvement.
4. ** Indoor unit Rated water flow rate.
Outdoor Units AHUW126A3 AHUW146A3 AHUW166A3
Combination Indoor Units AHNW16606B0 AHNW16606B0 AHNW16606B0
Power Supply Ø / V / Hz 1 / 220-240 / 50 1 / 220-240 / 50 1 / 220-240 / 50
Maximum Running Current Cooling A25 25 25
Heating A25 25 25
Wiring Connections For Power Supply
(Included Earth)
Number of
wires 333
* Capacity Cooling(Under floor) kW
10.4 11.0 12.0
Heating(Under floor) kW 12.0 14.0 16.0
* Power Input Cooling(Under floor) kW
3.30 3.53 4.00
Heating(Under floor) kW 2.78 3.43 4.18
* EER Cooling(Under floor) W/W 3.15 3.12 3.00
* COP Heating(Under floor) W/W 4.32 4.08 3.83
Operation Range (Min.~Max.)
Outdoor Temperature
Cooling °C 5 ~ 48 5 ~ 48 5 ~ 48
Heating °C -20 ~ 30 -20 ~ 30 -20 ~ 30
Compressor
Type -Hermetic Motor Hermetic Motor Hermetic Motor
Model -GPT442MAA GPT442MAA GPT442MAA
Quantity EA 1 1 1
Displacement cm3/Rev. 44.2 44.2 44.2
Capacity kW 13.92 13.92 13.92
Compressor Motor
Type -Brushless Brushless Brushless
Quantity EA 1 1 1
Rated Output W4,000 4,000 4,000
Refrigerant
Type -R410A R410A R410A
Charge g2,300 2,300 2,300
Control - EEV EEV EEV
Refrigerant Oil Type -FVC68D FVC68D FVC68D
Charged Volume cc 1,300 1,300 1,300
Heat Exchanger
Quantity EA 2 2 2
Rows EA 2 2 2
Columns EA 32 32 32
FPI Fins/inch 14 14 14
Fan
Type -Propeller Propeller Propeller
Quantity EA 2 2 2
Air Flow Rate CMM(l/s) 55 55 55
Fan Motor
Model -BLDC BLDC BLDC
Quantity EA 2 2 2
Output W124 124 124
Sound Power Level Heating dB(A) 66 66 66
Liquid Piping Connection Type -Flare Flare Flare
Outer Diameter mm(inch) Ø 9.52 (3/8) Ø 9.52 (3/8) Ø 9.52 (3/8)
Gas Piping Connection Type -Flare Flare Flare
Outer Diameter mm(inch) Ø 15.88 (5/8) Ø 15.88 (5/8) Ø 15.88 (5/8)
Piping Length
(Outdoor Unit ~ Indoor Unit)
Minimum m 3 3 3
Standard m7.5 7.5 7.5
Maximum m50 50 50
Height Difference
(Outdoor Unit ~ Indoor Unit) Maximum m30 30 30
Additional Refrigerant Charge g/m 40 40 40
Dimensions Unit(W x H x D) mm 950 x 1,380 x 330 950 x 1,380 x 330 950 x 1,380 x 330
Packed Unit(W x H x D) mm 1,140 x 1,462 x 461 1,140 x 1,462 x 461 1,140 x 1,462 x 461
Weight Unit kg 94 94 94
Packed Unit kg 107 107 107
**Rated water flow rate LPM 34 40 46

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Note :
1. Capacities and power inputs are based on the following conditions:
* : Cooling conditions - Indoor Water Temperature 23°C/18°C; Outdoor Air Temperature 35°CDB/24°CWB
Heating conditions - Indoor Water Temperature 30°C/35°C; Outdoor Air Temperature 7°CDB/6°CWB
Standard piping length 7.5m
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose of improvement.
4. ** Indoor unit Rated water flow rate.
Outdoor Units AHUW128A3 AHUW148A3 AHUW168A3
Combination Indoor Units AHNW16606B0 AHNW16606B0 AHNW16606B0
Power Supply Ø / V / Hz 3 / 380-415 / 50 3 / 380-415 / 50 3 / 380-415 / 50
Maximum Running Current Cooling A16.1 16.1 16.1
Heating A16.1 16.1 16.1
Wiring Connections For Power Supply
(Included Earth)
Number of
wires 555
* Capacity Cooling(Under floor) kW
10.4 11.0 12.0
Heating(Under floor) kW 12.0 14.0 16.0
* Power Input Cooling(Under floor) kW
3.30 3.53 4.00
Heating(Under floor) kW 2.78 3.43 4.18
* EER Cooling(Under floor) W/W 3.15 3.12 3.00
* COP Heating(Under floor) W/W 4.32 4.08 3.83
Operation Range (Min.~Max.)
Outdoor Temperature
Cooling °C 5 ~ 48 5 ~ 48 5 ~ 48
Heating °C -20 ~ 30 -20 ~ 30 -20 ~ 30
Compressor
Type -Hermetic Motor Hermetic Motor Hermetic Motor
Model -GPT442MAA GPT442MAA GPT442MAA
Quantity EA 1 1 1
Displacement cm3/Rev. 44.2 44.2 44.2
Capacity kW 13.92 13.92 13.92
Compressor Motor
Type -Brushless Brushless Brushless
Quantity EA 1 1 1
Rated Output W4,000 4,000 4,000
Refrigerant
Type -R410A R410A R410A
Charge g2,300 2,300 2,300
Control - EEV EEV EEV
Refrigerant Oil Type -FVC68D FVC68D FVC68D
Charged Volume cc 1,300 1,300 1,300
Heat Exchanger
Quantity EA 2 2 2
Rows EA 2 2 2
Columns EA 32 32 32
FPI Fins/inch 14 14 14
Fan
Type -Propeller Propeller Propeller
Quantity EA 2 2 2
Air Flow Rate CMM(l/s) 55 55 55
Fan Motor
Model -BLDC BLDC BLDC
Quantity EA 2 2 2
Output W124 124 124
Sound Power Level Heating dB(A) 66 66 66
Liquid Piping Connection Type -Flare Flare Flare
Outer Diameter mm(inch) Ø 9.52 (3/8) Ø 9.52 (3/8) Ø 9.52 (3/8)
Gas Piping Connection Type -Flare Flare Flare
Outer Diameter mm(inch) Ø 15.88 (5/8) Ø 15.88 (5/8) Ø 15.88 (5/8)
Piping Length
(Outdoor Unit ~ Indoor Unit)
Minimum m 3 3 3
Standard m7.5 7.5 7.5
Maximum m50 50 50
Height Difference
(Outdoor Unit ~ Indoor Unit) Maximum m30 30 30
Additional Refrigerant Charge g/m 40 40 40
Dimensions Unit(W x H x D) mm 950 × 1,380 × 330 950 × 1,380 × 330 950 × 1,380 × 330
Packed Unit(W x H x D) mm 1,140 × 1,462 × 461 1,140 × 1,462 × 461 1,140 × 1,462 × 461
Weight Unit kg 94 94 94
Packed Unit kg 107 107 107
**Rated water flow rate LPM 34 40 46

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3. Function Table
Indoor
Features Notes Function availability
Buffer tank ensures energy for defrost hydraulic separator to bal-
ance the heating system 40liters
Circulation pump O
3way valve control to switch between space heating and DHW heating O
Electrical heater on/off for heating and DHW 3 X 2kW max
Stop by flow switch O
Safety valve O
Outdoor temperature sensing for weather dependent operation O
modbus communication between outdoor unit and indoor unit O
heating loops control 1 direct, 1 mixing O
DHW heating O
Cooling O
Screet drying O
Gas/oil boiler heat utilisation (hybrid function) O
Weather dependent heating (heating curve) O
Web cloud service connectin with web module option
2 extra heating loops 2 mixings with expansion module optoin
Pool cooling/heating with expansion module option
Solar / boimass heat utilisation with expansion module option
Room thermostat with curve correction with KT1 or KT2 module option
Local ON/OFF thermostat connection option

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4. Pump Hydraulic Performance
Pump capacity
AHNW16606B0
Pump model : Yonos PARA RS 25/7.0 PWM1 Ku
WARNING
Selecting a water flowrate outside the curves can cause damage to or malfunction of the unit.

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5. Piping Diagrams
1Return flow – heating system ABuffer tank
2Flow – heating system BCirculating pump
3DHW – Hot water CElectric flow heater
4DHW – Circulation D -
5DHW – Cold water ECondenser
6ODU – gas pipe F3 Way Valve
7ODU – liquid pipe GDHW tank
8Mg. Annode TIC Temperature sensor
9 - PIC Pressure indicator
10 Safety group – Pressure indicator, safety valve,
automatic air vent FZAL Flow switch

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6. Wiring Diagrams
Indoor Unit
Model : AHNW16606B0

- 17 -
ELEMENT TERMINAL BLOCK DESCRIPTION
X1 L1, L2, L3, N, PE Power cable
X2
A5, GND Temperature sensor for external temperature
Q11, N Cooling valve
Q12, N, PE Additional external source
X3
Q7, N, PE Circulation pump of heating cycle 1 (optional)
Q8, N, PE Circulation pump of heating cycle 2 (optional)
N, Q9+, Q10- Mixing valve of heating cycle 2 (optional)
A7, GND Temperature sensor of mixing-heating cycle 2 (optional)
X4
D8, GND Switch heating/cooling and/or PV signal (optional)
D7, GND Thermostat of heating cycle 2 (optional)
D6, GND Thermostat of heating cycle 1 (optional)
D5, GND Remote on/off (optional)
X5 BUS–A, BUS – B, GND, 10 V Communication with the ODU
X6 A+, B-, 12 V, GND Communication spatial corrector (optional)
X7 A+, B-, 12 V, GND Communication with expansion unit TT3003
1Flow electrical heater
2Tree way valve for switching between heating and DHW
3Basic input/output module MD1
4D4 Flow switch
5Web module (OPTIONAL)
TW Modbus Communication with PLC
TX Modbus Not in use
Ethernet Internet connection
6A6 Temperature sensor of the supply pipe
7Q3 Main circulation pump
8A1 Temperature sensor of the return line
9Process module - PLC
WM Communication with the Web module
TEX MODBUS communication with the ODU
TS Communication with the spatial corrector
TE2 Communication with the basic module MD1
RQ1 ALARM dry contact
RQ2 RESET dry contact
10 Power supply ~ 230 V / 12 V
LPhase 230 V 50 Hz
NNeutral 230 V 50 Hz
Protective earth
V- GND
V+ 12 V dc
11 A3 Temperature sensor refrigerant pipe – condenser inlet.
12 A4 Temperature sensor refrigerant pipe – condenser outlet.
13 Membrane Keyboard
14 A2 Temperature sensor of sanitary water
CElectrical contactor of the electrical heater
TV Thermal protection of the electrical heater
RC RC Filter.

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Outdoor Unit
Models : AHUW146A2
Models : AHUW096A3

- 19 -
Models : AHUW166A3, AHUW146A3, AHUW126A3

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Models : AHUW168A3, AHUW148A3, AHUW128A3