LG Therma V R32 Gen3 Manual

LG Therma V R32 Gen3 Typical
Installation with Third Party controls
Installation and Setup
Monobloc system
Rev 1.0 January 14th 2022

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This manual is designed to be a quick guide to the most common type of installation for a LG Therma V R32
Monobloc system.
This assumes heating via Buffer Tank, domestic hot water via a cylinder with sensor pocket and immersion
heater, 3 port valve controlled Via the LG controller and Heating Control Via Third Party.
In the above system the monobloc units functions are controlled by the units own controller and this is only
used by the technician not the end user.
The end user controls the heating demand using a third party wired controller and can use this to set the room
temperature at different times of the day.
The heat pump controls the domestic hot water temperature itself (including for an optional sterilization cycle)
and is assisted by the immersion heater. 2 port valves MUST not to be used upstream of the buffer.
The hot water control is managed through the LG controller. Hot water takes priority over heating.
There is no electric heater inside the monobloc unit, however there is a additional booster heater available.
There is a flow sensor located within the unit.
A pump is installed within the Monobloc, However a second pump will be required on downstream of the buffer to
feed the heating circuits
A strainer must be installed in the return pipework to the mono block. It is strongly recommended by LG in addition to
this a Magnetic filter and Flow setter should also be installed.

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Warranty
Please check the following before commencing startup as they are important conditions of the LG warranty.
• A strainer with a minimum 400 microns must be installed, in addition a Magnetic filter and flow
setter are strongly recommended.
• A buffer tank should be used to ensure a minimum primary water volume of 25lt is obtained for the
single fan units and 50lt for the double fan units.
• The pipe diameter used must be no smaller than 28mm copper (larger if plastic). Contact Secon for advice
if the pipe length exceeds 10 metres or you are using plastic pipe.
• The external unit should be placed on a level, strong base suitable of withstanding its weight.
• The unit should be sited to allow good air flow around the unit and should not be located less than
300mm from any structure behind, with at least 700mm in front (we would recommend no less than 2m)
• Allowance for the condensate to soakaway, via a soakaway of to drain, not to allow ice formation around
the unit.
• Anti freeze is recommended to protect again frost damage this should be premixed and added to the
system, we will go into further detail later.
• The water quality should be tested against LG Requirements.
• The Mains power must be turned on 6 Hours before starting the product.
Part of the startup process involves checking the water flow rate. In order for the unit to operate at all then an absolute minimum flow rates
must be met, but for correct operation as designed then a water flow rates below must be observed below.
Capacity
Rated flow rate LPM
Rated flow rate M³h
Minimum Primary Pipework
size mm
5kw
14.37 Lpm
0.9 m³h
22mm
7kw
20.12 Lpm
1.2 m³h
28mm
9kw
25.87 Lpm
1.5 m³h
28mm
12kw
34.5 Lpm
2.1 m³h
28mm
14kw
40.25 Lpm
2.4 m³h
35mm
16kw
46 Lpm
2.8 m³h
35mm
*Taken from the Manufactures Recommendations, all pipe sizes should be calculated and checked, and remain responsibility of the
installer to provide adequate flow through the unit.

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Power Supply
MonoBloc units require one power supply
Power supplies sizes are-
*All Electrical cable sizes should be checked on site by a NICEIC qualified electrician
The Following Points must be followed
oRCD –Type C.
oRotary Enclosed Isolation switch –IP65.
oMandatory electricity meter fitted within an
enclosed box.
oEnsure power cable does not touch refrigerant
pipework.

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Control Wiring
This shows a basic wiring schematic for a Heating and Domestic hot water system as for the hydraulic drawing
on the first page.
Connections are made to the directly to the Monoblock via the 1st wiring centre as shown below:
*Wiring back to terminals differs on older models until August 2020
Third Party controls should be wired through terminal 17 (L) and terminal 20 (L2) using a NO Relay. Please
see below schematic for single Zone operation through 3rd party controls, this should be integrated with
the above for DHW control also.

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Please Note
•We recommend all communication cable and Power cables are separated to stop the
protentional for interference, All communication cables should be screened.
•We recommend that all power supplies to heating pumps and immersion heaters
Should go through local points of isolation via Switched fuse spurs.
•The tank sensor is not a generic item and LG approved sensors should only be used.
•Any Immersion heater stats should be set to maximum.
•All details should be confirmed with the LG manual.
•All Electrical work should be completed by NICEIC approved Electrician.
DIP Switch Settings
The unit contains a number of DIP switches these must be set prior to powering up the unit in order to allow
the unit to operate correctly and to allow some features to function.
The Dip Switches are laid out as the diagram below:
SW2
1 - Off ( Master)
2 - Off
3 –ON (unit, Outdoor Unit DHW tank Installed)
4 –Off (Heating Only)
5 –Off (Flow switch always Detected)
6 –Off
7 –Off
8 –ON (third party thermostat used)
SW1
All off as Default
SW3
1 - Off
2 –ON if Anti Freeze is used
3 - Off
4 - Off
Anti-freezing temperature setting is available in
installer mode. Change the value from -5 to -10 *
*Please Refer to the table below when
setting Anti-Freeze levels

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• It is the responsibility of the installer to ensure the correct amount of antifreeze additiveis applied to
the water system to protect the product against water temperatures below 0℃. The correct volume of
water contained in the system should be calculated, with six additional liters added for the AWHP
product, as per the installation instructions.
Guidance from this instruction is provided below :-
• If Antifreeze is added to the hydraulic system water then the antifreeze solution temp can be adjusted in
the installer settings. (The setting is not visible normally, method is described later)
• Possible settings are displayed as below.
- Temperature : -5 / -10 / -15 / -20 / -25℃(Default : -5℃)
• The values shown are not actual temperature setting but an offset that can be applied to the default value
of 0℃, as shown in the previous slide. When the function is activated the default value is -5℃.
• Example if setting -10 is used;
- entering water temp for judgment is reduced from 15℃to 5℃for protection starting
- entering water for condition release is reduced from 18℃(15℃+ 3℃) to 8℃(5℃+ 3℃)
Pre-Start Check
Please check the following prior to starting the unit :
•The power supply to the mono-bloc must have been on 6hr prior to starting.
•Check all electrical and wiring connections are as per LG spec
•Make sure that all hydraulic connection is as per LG spec
•Make sure the system is full and vented.
•Check the Anti-freeze level is adequate
•Check that the system has been adequately flushed.
•Check there is an adequately sized expansion vessel fitted to the system and safety relief valve. Inside the monobloc
there is a 8lt vessel with a 1 bar precharge, this is adequate for system volumes up to 230lt dependent on system
head.

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Starting the unit for First Time
Power up the unit.
1. Press the Right hand button and Select Menu, Confirm with OK
2. Use the Right hand button Select Setting, Press and Hold the up Button for 3 Seconds
3. 4 square boxes are shown enter the Password (this is the software version in the right hand bottom
corner of the screen).
You are now in the Installer Configuration menu. The following setting need to be set for Basic operation.
Software Version
ok
ok
Min Max
30 50-55 –RADS
40-45 - UFH
ok
ok

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ok
Use Sun 1:00am
ok
ok
ok
60 30
Force end (time) 1
ok
Main+Booster Heater ON
ok
ok
60 0 60
ok
ok
AS ABOVE
ok

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Here We Talk about setting the Weather Compensated Curve in Installer settings.
(*These Setting will be site Dependant)
In the example below the external design temp is -2.8 ֯ C with a Design Flow temp of 50֯C for Radiators
Controler Video: LG Therma V R32 Monobloc Installer Setting Guide - Bing video
Function
Description
Range
Default
Set
Outdoor 1, Heat
(OUT 1)
Heating Lower ambient
Temp
-25 - 35֯c
-10֯c
- 2.8֯c *
Outdoor 2, Heat
(OUT 2)
Heating Higher ambient
Temp
16֯c
19֯c *
Water1, Heat
(LW1)
Heating higher Water Temp
Dependant on Field Settings
35֯c
50֯c *
Water2, Heat
(LW2)
Heating Lower Water Temp
28֯c
30֯c *
MODE- Select HEAT

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Test Run of Heating Pump
Within the Installer menu Select Pump test run
To use this function, the antifreeze short pin must be open and switch No.2 in Option SW 3must be
on.
Please See Earlier Section Regards
Antifreeze Levels
Through out this process the Flowrate should be observed
to check it meet MI.
The system should be vent of air and check that it is full of
water.

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The System can now be put into normal Operation
Trouble Shooting
Problem
Reason
Solution
1
Heating or
Cooling is not
satisfactory.
• Setting target temperature is
not proper.
• Set target temperature correctly.
• Check if temperature is water-based or air-based . See "Remote
sensor active' and 'Temp. sensor selection' in Chapter6.
• Charged water is not
enough.
• Check pressure gage and charge more water until pressure gage
is indication 2~2.5 Bar
• Water flow rate is low.
• Check if strainer gathers too much partices. If so, strainer
should be cleaned.
• Check if pressure gage indicates above 4 Bar
• Check if water pipe is getting closed due to stacked paticles or
lime.
2
Although
electric power
supply is OK
(remote
controller
displays
information), the
unit does not
start working.
• Water inlet temperature is
too high.
• If water inlet temperature is above 57 °C, the unit does not
operated for the sake of system protection
• Water inlet temperature is
too low.
• If water inlet temperature is below 5 °C in cooling operation, the unit
does not operated for the sake of system protection. Wait while unit
warms up the water inlet temperature.
• If water inlet temperature is below 15 °C in heating operation,the
unit does not operated for the sake of system protection. Wait
while unit warms up to 18 °C the water inlet temperature.
• If you are not using the back up heater accessory (HA**1M
E1), increase the water temperature with the external heat
source (heater, boiler).
If the problem persists, contact your dealer.
• If you want to use the screed drying function, be sure to purchase
and install back up hater accessories (HA** 1M E1).
3
Water pump
noise.
• Air purging is not
completely finished.
• Open the cap of air purge and charge more water until
pressure gage is indicating 2~2.5 Bar
• If water does not splash out when the tip(at the top of the hole)
is pressed, then air purging is not completed yet. If well purged,
the water will splash out like fountain.
• Water pressure is low.
• Check if pressure gage indicates above 0.3 Bar.
• Check if the expanstion tank and pressure gage operates well.
4
Water is flood
out through
drain hose.
• Too much water is
charged.
• Flood out water by opening the switch of the safety valve until
pressure gage is indicating 2~2.5 Bar.
• Expantion tank is
damaged.
• Replace the expantion tank
5
DHW is not hot.
• Thermal protector of water
tank heater is actived.
• Open the side panel of the DHW tank and push the reset button
of the thermal protector. (for more detail information, please
refer to intallation manual of DHW tank.
• DHW Heating is disabled.
• Select DHW Heating Operation and identify if icon is displayed on
the remote conrtoller.

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Error Codes
Code No.
Description
Cause
Normal Condition
1
Problem in remote room air sensor
• Incorrect connection between
sensor and PCB(Heater).
• PCB(Heater) fault
• Sensor fault
• Resistance: 10 kO at 25 centigrade
(unplugged) -+ for Remote room air
sensor
• Resistance: 5 kO at 25 centigrade
(unplugged)-+ for all sensors EXCEPT
remote room air sensor
• Voltage: 2.5 V DC at 25 centigrade
(plugged) (for all sensors)
• Refer resistance-temperature table to
check in different temperature
2
Problem in refrigerant (inlet side) sensor
6
Problem in refrigerant (outlet side) sensor
8
Problem in water tank sensor
13
Problem in solar pipe sensor
16
Problems in sensors
17
Problem in water-inlet sensor
18
Problem in water-outlet sensor
19
Problem in electric heater outlet sensor
10
BLOC Water pump Lock
Restriction of BLOC Water pump
• BLOC Water pump defect/
assembly condition abnormal
• Fan lock by foreign material
3
Bad communication between remote
controller and unit.
• Incorrect connection between
sensor and PCB(Heater)
• PCB(Heater) fault
• Sensor fault
• Wire connection between remote
controller and Main PCB
assembly(Heater) should be tight
• Output voltage of PCB should be 12 V
DC
5
Bad communication between Main PCB
assembly(Heater) and Main PCB assembly(lnverter)
of the unit.
• The connector for transmission is
disconnected
• The connecting wires are
misconnected
• The communication line is broken
• Main PCB assembly(lnverter) is
abnormal
• Main PCB assembly(Heater) is
abnormal
• Wire connection between remote
control panel and Main PCB
assembly(Heater) should be tight.
53
9
PCB program (EEPROM) fault
• Electrical or mechanical damage a
the EEPROM
• This error can not be permitted
14
Problem in flow switch
• Flow switch is open while internal
water pump is working
• Flow switch is closed while internal
water pump is not working
• Flow switch is open while DIP
switch No. 5 of Main PCB
assembly(Heater) is set as on
• Flow switch should be closed while
internal water pump is working or DIP
switch No. 5 of Main PCB
assembly(Heater) is set as on
• Flow switch should be open while
internal water pump is not working
15
Water pipe overheated
• Abnormal operation of electric
heater
• Leaving water temperature is
above 72 °C.
• If there is no problem in electric heater
control, possible maximum leaving
water temperature is 72 °C

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20
Thermal fuse is damaged
• Thermal fuse is cut off by abnormal
overheating of internal electric
heater
• Mechanical fault at thermal fuse
• Wire is damaged
• This error will not be happened if
temperature of electric heater tankis
below 80 °C
Display
code
Title
Cause of error
Check point & Normal condition
21
DC PEAK
(1PM Fault)
• Instant over current
• Over Rated current
• Poor insulation of 1PM
• An instant over current in the U,V,W
phase
- Comp lock
- The abnormal connection of U,V,W
• Over load condition
- Overcharging of
refrigerant Pipe
length. Outdoor
Fan is stop
• Poor insulation of compressor
22
Max. C(T
Input Over Current
1. Malfunction of Compressor
2. Blocking of Pipe
3. Low Voltage Input
4. Refrigerant, Pipe length, Blocked...
23
DC Link High/ Low Volt
• DC Link Voltage is above 420 V DC
• DC Link Voltage is below 140 V DC
• Check CN_(L), CN_(N) Connection
• Check Input Voltage
• Check PCB DC Link voltage sensor parts
24
Low/High Pressure Switch Perception Error
• Low pressure is below 0.2 kgf/cm
2.
• High pressure is above 42~44kgf
/cm
2.
• Pressure switch is self-defective.
• Check the low/high pressure
• Check the connection of harness
26
DC Compressor Position
• Compressor Starting fail error
• Check the connection of comp wire
"U,V,W"
• Malfunction of compressor
• Check the component of "IPM",
detection parts.
27
AC Input Instant over Current Error
PCB(lnverter) input current is over 100
A(peak) for 2 us
1. Overload operation (Pipe
clogging/Covering/EEV
defect/Ref. overcharge)
2. Compressor damage
(Insulation damage/Motor
damage)
3. Input voltage abnormal (L,N)
4. Power line assemble condition
abnormal
5. PCB assembly 1 Damage (input current
sensing part)
29
Inverter compressor over current
(HM**1M U*3) Inverter Compressor
input current is 35 Apk.
(HM**3M U*3) Inverter Compressor
input current is 35 Apk.
1. Overload operation (Pipe
clogging/Covering/EEV
defect/Ref. overcharge)
2. Compressor damage(lnsulation
damage/Motor damage)
3. Input voltage low
4. ODU PCB assembly 1 damage

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Display
code
Title
Cause of error
Check point & Normal condition
41
Problem in D-pipe temperature sensor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector
(Open/Short)
3. Defect of outdoor PCB(lnverter)
43
Problem in high pressure sensor
Abnormal value of sensor
(Open/Short)
• Bad connection of connector PCB(lnverter)
• Bad connection high pressure connector
• Defect of high pressure connector
(Open/Short)
• Defect of connector PCB(lnverter)
(Open/Short)
• Defect of PCB(lnverter)
44
Problem in outdoor air temperature sensor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector
(Open/Short)
3. Defect of outdoor PCB(lnverter)
45
Problem in Cond. middle pipe temperature sensor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector
(Open/Short)
3. Defect of outdoor PCB(lnverter)
46
Problem in suctionpipe temperature sensor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector
(Open/Short)
3. Defect of outdoor PCB(lnverter)
52
PCB Communication Error
Checking the communication state
between Main PCB and Inverter PCB
• Generation of noise
source interfering with
communication
32
High temperature inDischarge pipe of the
inverter compressor
• Overload operation (Outdoor fan
constraint, screened, blocked)
• Refrigerant leakage (insufficient)
• Poor INV Comp Discharge sensor
• LEV connector displaced/ poor
LEV assembly
• Check outdoor fan constraint/
screened/ flow structure
• Check refrigerant leakage
• Check if the sensor is normal
• Check the status of EEV assembly
35
Low pressure Error
Excessive decrease of low pressure
• Defective low pressure sensor
• Defective unit fan
• Refrigerant shortage/leakage
• Deformation because of damage of
refrigerant pipe
• Defective unit EEV
• Covering/ clogging (unit
covering during the cooling
mode/ unit filter clogging during
heating mode)
• SVC valve clogging
• Defective unit PCB(lnverter)
• Defective unit pipe sensor

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54
Open and Reverse Phase Error
Prevention of phase unbalance and
prevention of reverse rotation of
constant-rate compressor
Main power wiring fault
60
PCB(lnverter) & MainEEPROM check sum error
EEPROM Access error and Check SUM
error
1. EEPROM contact defect/wrong insertion
2. Different EEPROM Version
3. ODU Inverter & Main PCB assembly 1
damage
61
High temperature in Cond. Pipe
• Overload operation (Outdoor fan
constraint, screened, blocked)
• Unit heat exchanger contaminated
• EEV connector displaced/ poor EEV
assembly
• Poor Cond . Pipe sensor assembly/
burned
• Check outdoor fan constraint/ screened /
flow structure
• Check if refrigerant overcharged
• Check the status of EEV assembly
• Check the status of sensor assembly/
burn
62
Heat sink Temp, High error
Heatsink temperature is greater than 110
°C.
1. Part no. : EBR37798101 ~09
- Check the heatsink
sensor: 10 kO / at 25
°C(Unplugged)
- Check the outdoor
fan is driving rightly 2. Part
no.: EBR37798112~21
- Check the soldered condition in the
22,23 pin of 1PM, PFCM
- Check the screw torque of 1PM, PFCM
- Check the spreadable condition of
thermal grease on 1PM, PFCM
- Check the outdoor fan is driving rightly
65
Problem in HeatsinkTemperature sensor
Abnormal value of sensor
(Open/Short)
• Check if there is defect of
thermistor connector
(Open/Short)
• Check defect of outdoor PCB(lnverter)
Display
code
Title
Cause of error
Check point & Normal condition
67
Fan lock error
Fan RPM is less than 10 for 5 seconds
from start-up operation. Fan RPM is less
than 40 in operation except for start-up
operation
1. . Fan motor damage
2. Assembly condition abnormal
3. Jammed fan by surroundings
114
Problem in Vapor injection inlet temperature
sensor
• Open (Below -48.7 °C)/
Short(Over 96.2 °C)
• Soldered poorly
• Internal circuit error
1. . Bad connection of thermistor
connector
2. Defect of thermistor connector
(Open/Short)
3. Defect of outdoor PCB(Outdoor)
115
Problem in Vapor injection outlet temperature
sensor
• Open (Below -48.7 °C)/
Short(Over 96.2 °C)
• Soldered poorly
• Internal circuit error
1. . Bad connection of thermistor
connector
2. Defect of thermistor connector
(Open/Short)
3. Defect of outdoor PCB(Outdoor)

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First two weeks: Blocked filters and/or air pockets
Flow rate alarms are likely to occur during the first two weeks after commissioning; this is due to
the formation of air-pockets which may occur and temporarily affect the flow-rate. In most cases,
the air will migrate to the auto-airvents (AAV) and release without any requirement for
intervention.
Equally, if any sediments are in the hydronic pipework, they will be caught by the internal strainer.
Blockages in thestrainer can cause CH14 alarms. In this case, the strainers will need to be cleaned
Recommendation: once the unit has been installed, advise the customers that it is quite likely and normal for a
CH14 alarmto occur in the first two weeks. This will give the customer reassurance if and when the fault does
arise!
If the cause was air, then a simple power reset could allow the system to continue working as normal, once the
pocket of airhas made its way to the AAV

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