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