alphainnoTec HT 6Split User manual

27-11-2020
29183
Installation and operating
manual
Indoor unit
Cooperating with air
heat pumps
HT 6Split
HT 12Split
Technische Änderungen vorbehalten | 83021400bUK – Originalbetriebsanleitung | ait-deutschland GmbH

3List of contents |HT 6Split
HT 12Split
List of contents
1 Important information_____________ 4
Information regarding safety __________________________ 4
2 Supply and operation______________ 6
Transport_________________________________________ 6
Assembly_________________________________________ 6
Included items_____________________________________ 6
Removal of the covers_______________________________ 6
3 Indoor module structure _________ 7
HT 6Split / HT 12Split _______________________________ 7
4 Pipe connections____________________ 9
General pipe connections ____________________________ 9
Pipe connections__________________________________ 13
Other information__________________________________ 13
Connection options ________________________________ 14
Connection options ________________________________ 18
DHW circulation___________________________________ 20
5 Outdoor unit LSplit________________21
Transport and storage______________________________ 21
Assembly________________________________________ 21
Lift from the street to the set up location________________ 21
Lift from the pallet to nal positioning __________________ 22
Scrapping _______________________________________ 22
Condensation run off_______________________________ 22
Recommended alternative for leading off condensation water22
Dimensions ______________________________________ 24
Installation area___________________________________ 26
Sound pressure levels______________________________ 26
6 Electrical connections ___________27
General information________________________________ 27
Connections______________________________________ 28
Optional connections_______________________________ 30
Settings _________________________________________ 31
7 Start-up and regulation __________31
Preparations _____________________________________ 31
Filling and venting _________________________________ 31
Circulation pump __________________________________ 32
Start____________________________________________ 33
Start guide_______________________________________ 33
8 Control - Introduction____________34
Display unit ______________________________________ 34
Menu system_____________________________________ 35
9 Control_________________________________37
Menu 1 - INDOOR CLIMATE_________________________ 37
Menu 2 - HOT WATER _____________________________ 38
Menu 3 - INFO____________________________________ 38
Menu 4 - MY SYSTEM _____________________________ 39
Menu 5 - SERVICE ________________________________ 40
Start guide_______________________________________ 41
Settings for the user _______________________________ 43
Service submenus_________________________________ 52
Cooling settings___________________________________ 58
10 Service _______________________________59
Service actions ___________________________________ 59
11 Disturbances in comfort_______63
Troubleshooting___________________________________ 63
Additional heating only _____________________________ 64
12 Accessories ________________________65
Connecting the KVR accessory_______________________ 66
13 Technical data _____________________67
Dimensions and layout of connections _________________ 67
Technical data ____________________________________ 68
Performance _____________________________________ 69
Diagram of electrical connections _____________________ 70

4HT 6Split
HT 12Split
1 Important information
Information regarding
safety
Serial number
Symbols
Marking
HT 6Split / HT 12Split features
the CE mark and water protec-
tion IP21.
The CE mark conrms that Alpha in-
notechastaken careforproduct con-
formity with applicable regulations of
relevant EU Directives. The CE is re-
quired for most products sold in the
EU, regardless of their place of man-
ufacture.
IP21 means that items with the di-
ameter greater or equal to 12.5 mm
cannot access inside causing dam-
age, and that the product has been
secured against vertically falling wa-
ter drops.
The device can be operated by chil-
dred aged over 8 and persons with
physical, sensoric, or mental disa-
bilities, and without any experience
or knowledge about its operation, if
supervised or trained in safe opera-
tion, and if they understand the risks
related to its operation. The device
must not serve as a toy for children.
Activities related to cleaning and ba-
sic maintenance must not be per-
formed by unsupervised children.
Rightstoimplementdesignchanges
are reserved.
©Alpha innotec 2019
This manual contains installation
and maintenance procedures for
specialists.
The serialnumber islocatedat the
bottom of the rating plate, on the
top cover HT 6Split / HT 12Split
and consists of 14 digits.
IMPORTANT
This symbol informs about the
risk to the device or a person
CAUTION
This symbol points to im-
portant information to be
noted when operating the
device easier.
ADVICE
This symbol shall mean
tips to make product oper-
ation easier.
Serial
number
(PF3)
Chapter 1 | Important information

5HT 6Split
HT 12Split
Waste disposal
Disposal of the packaging
shall be the responsibility
of the installation techni-
cian installing the product,
or a special waste man-
agement facility.
Description Notes Signature Date
Heating medium
Installation rinsing
Installation venting
Diaphragm expansion vessel
Particulate lter
Safety valve
Cut-o󰀨 valves
Pressure in the heating system
Connection according to the drawing
Hot water
Cut-o󰀨 valves
Mixing valve
Safety valve
Power supply
Communication connection
Circuit fuses
Fuses, internal module
Building fuses
Temperature sensor outdoor
Room sensor
Energy meter
Emergency switch
Switch di󰀨erential
Thermostatemergencymodesetting
Miscellaneous
Connected to
Installation acceptance
The heating system must be accepted before start-up. Acceptance must be done by a person with appropriate
qualications. Complete the card in the operating manual by entering the installation data.
CHECKLIST
Chapter 1 | Important information
Do not dispose of decommissioned
products together with regular
household wastes. Hand them over
to a specialist facility dealing with
waste disposal or salesperson of-
fering such services.
Incorrect disposal of the product by
the user is subject to administrative
penalties under applicable regula-
tions.

6HT 6Split
HT 12Split
2 Supply and operation
Transport Included items
Assembly
HT 6Split / HT 12Split heat pump must be transported
and stored vertically in a dry place. HT 6Split / HT12Split
can be, however, carefully placed on the rear side of the
casing when carrying the device into the building.
Leave 800 mm free space at the front of the heat
pump. All maintenance works on HT 6Split / HT
12Split can be done from the front.
The side covers and rear wall of the housing are per-
manently attached, therefore it is not possible to dis-
mantle them.
• HT 6Split / HT 12Split must be set on a solid wa-
terproof base that would keep the weight of the
indoor unit. The regulated legs of the heat pump
allow for levelling and stable setting of the device.
• Because HT 6Split / HT 12Split is equipped with
condensate drain, indoor unit installation site must
be furnished with a  oor drain with a discharge to
the sewer system.
1. Remove screws at the bottom edge of the front cover.
2. Open the cover at the lower edge, taking care to
not damage the connecting cables, and then re-
move the front cover by lifting it up.
3. Disconnect the cable connecting the front cover
to the unit.
Installation site
Removal of the covers
3
Chapter 2 | Supply and operation
20-40 mm Wrench size 13
IMPORTANT
When using an additional heat source, leave behind
the device the space necessary for non trouble free
connections and subsequent maintenance.
25-30 mm
800 mm
IMPORTANT
The opening pressure of the safety valve is 3 bar.
Safety group with safety
valve (3 bar), pressure
gauge and automatic air
vent (1 pc.)
Temperature sensor
Outdoor and indoor
(2 pcs)
Connection p.28
Current sensor (3 pcs)
Connection p.28 230V connection jumper (1 pc.)
LEK
LEK
LEK

7HT 6Split
HT 12Split
3 Indoor module structure
Chapter 3 | Indoor module structure
HT 6Split / HT 12Split XL11 XL10 XL4 XL13 XL14 XL3
GP12
AA27
AA8
AA2:X4AA2:X15
AA2
K2
BT64
XL2
XL1
EP2QN12
BT12CM1
BP4EB1
BT15BT63
BT3
BT6
BT7
X10
X0
BT30
FD1
X1
EB1
AA23
FA1
K1A-K3A
FA2
AA3
SF1
X2
AA7
EB2
BT71
XL5 BT25
QN10

8HT 6Split
HT 12Split
LEGEND
Pipe connections
XL1 Connection, heating medium, supply
XL2 Connection, heating medium, return
XL3 Connection, cold water
XL4 Connection, hot water
XL5 Connection, hot water circulation
XL10 Connection, cooling
XL11 Connection, safety group,manometer
XL13 Connection, liquid cooling medium
XL14 Connection, gas cooling medium
HVAC elements
CM1 Diaphragm expansion vessel, closed
QN10 Isolation valve, domestic hot water / cen-
tral heating
QN12 Isolation valve, cooling/heating
GP12 Circulation pump
EP2 Heat exchanger
Sensors
BP4 Pressure sensor, high pressure
BT3 Temperature sensor, heating medium re-
turn
BT6 Temperature sensor, hot water loading
BT7 Temperature sensor, top of the hot water
heater
BT12 Temperature sensor, condenser outlet
BT15 Temperature sensor, liquid
BT25 Temperature sensor, heating medium
supply
BT63 Temperature sensor, heating medium sup-
ply downstream the submersible heater
BT64 Temperature sensor, cooling medium
supply
BT71 Temperature sensor, heating medium re-
turn
Electrical elements
X0 High voltage terminal block 400V~/230V~
X1 Low voltage terminal block 230V~
X2 Low voltage terminal block 230V~
X10 Low voltage terminal block 230V~
AA2:X4 Low voltage terminal block
AA2: X15 Low voltage terminal block
K1A-K3A Submersible heater switch
K2 Alarm relay
BT30 Thermostat - emergency mode
AA2 Main card
AA3 Sensor card
AA23 Communication card
AA7 Relay card
AA8 Titanium anode card
AA27 Relay card
FD1 Temperature limiter
FA1 Circuit breaker (to internal module)
FA2 Circuit breaker (L Split)
EB1 Submersible heater
Other
EB15 HT 6Split / HT 12Split
SF1 Controller switch
PF3 Serial number
EB2 Domestic hot water tank
Chapter 3 | Indoor module structure

9HT 6Split
HT 12Split
4 Pipe connections
General pipe connections
Pipe installation must be carried out in accordance
with current norms and directives.
The pipe dimension should not be less than the recom-
mended pipe diameter according to the table below.
However, each system must be dimensioned individu-
ally to achieve the recommended system ows.
The system can cooperate with a low- and medium
temperature heating system. Recommended temper-
ature of the heating medium at minimum designed
outdoor temperature DOT must not exceed 55°C on
supply, and 45 °C on return circuit from the heating
system, whereas HT 12Split / HT 6Split can achieve
even 65 °C when using a ow-through heating mod-
ule or another peak heat source.
Excess medium owing out of the safety valve must
be discharged via a pipe to a oor drain. The over-
ow pipe must be slanted at the entire length from the
safety valve, and must be secured against freezing.
In order to achieve maximum system e󰀩ciency, we
recommend the installation of HT 12Split / HT 6Split
as close to the heat pump as possible.
The HT 12Split / HT6Split module is not equipped with
cut-o󰀨 valves, which must be installed outside the in-
door module to make future maintenance easier.
The HT 12Split / HT 6Split module can be connected
to the central heating, cooling, and domestic hot wa-
ter installation. Install the supplied safety valve and
the manometer.
Air/water
heat pump Minimum
ow during
defrosting
(100%
pump
speed (l/s)
Minimum
recom-
mended
pipe
dimension
(DN)
Minimum
recom-
mended
pipe
dimension
(mm)
HT6Split/
L6Split 0,19 20 22
HT 12Split/
L8Split 0,19 20 22
HT 12Split/
L12Split 0,29 20 22
IMPORTANT
Any high points in the climate system, must be
equipped with air vents.
IMPORTANT
The pipe systems need to be ushed out before
the indoor module is connected so that
any debris cannot damage component parts.
IMPORTANT
As long as heating circuits in the system have not been
lled with the heating medium, do not set the switch
(SF1) in the controller in position “I” or “ ”. The com-
pressor in the heat pump and the ow-through heating
module can be damaged.
MINIMUM SYSTEM FLOWS
The installation must be dimensioned at least to man-
age the minimum defrosting ow at 100% pump op-
eration, see table.
IMPORTANT
All connections require free ow, hence a discharge
valve must be installed.
IMPORTANT
An undersized system can result in damage to the
machine and lead to malfunctions.
Chapter 4 | Pipe connections
HT 6Split / HT 12Split is
equipped with a pressure
expansion vessel of
10 litres. The pre-pres-
sure of the pressure ex-
pansion vessel must be
dimensioned according to
the maximum height (H)
between the vessel and
the highest positioned
radiator, see gure. A
pre-pressure of 0.5 bar (5
mvp) means a maximum
permitted height di󰀨er-
Expansion vessel
Bu󰀨er vessel
Minimum volume of the heating system
CAUTION
The diaphragm expansion vessel at the domestic hot
water installation is not required. It is, however, required
to install a safety valve with opening pressure of 3 bar.
ence of 5 m. The maximum system volume excluding
the boiler is 220 litres at the above pre-pressure.
Approx. 10 l/kW is required for connection to the heat
pump, and many heating systems do not have this
volume. To prevent operational problems, the volume
is then expanded using a UKV bu󰀨er vessel.
H
LSplit 6 8 12
Minimum volume of the heating system
during heating / cooling 50l 80l 100l
IMPORTANT
In order to achieve undisturbed ow of the heating sys-
tem, use a hydraulic coupling or open heating loops.
Remember to always keep the minimum required ow
in the installation - see the section "Minimal ow in the
installation".

10 HT 6Split
HT 12Split
XL10
XL1
XL2
-EB101
-BT1
BA-SVM 10-200
-GP11
P
XL18XL19
HS1 -BP4
-BT15
-BT12
-BT3
-GP12 -BT25 -QN12 -BT63
-BT71
-QN10
-BT7
-BT6
P
EQ-BT25/BT64
The HT 6Split / HT 12Split indoor unit is equipped
with a coil water heater, diaphragm expansion vessel,
safety group, electric heating module (heater), isola-
tion valves, plate heat exchanger, metering instru-
ments, and an electronic circulation pump. Together
with the outdoor unit of air heat pump LSplit, forms a
complete heating system.
The LSplit outdoor unit provides heat for heating the
domestic hot water and supplying the heating system
while using free energy in the outdoor air, e󰀩ciently
operating within the range of low temperatures up to
-20°C.
Installation diagram The connection of the outdoor unit and indoor unit HT
6Split / HT 12Split, with a system of pipes lled with
a cooling medium secures the connection against
freezing in the event of any power outages. The con-
trol of system operation is the function of controller
module.
Symbol Description


Cut-o󰀨 valve


Non-return valve


Three-way valve


Safety valve


Temperature sensor


Diaphragm expansion
vessel

Manometer


Vent


Circulation pump
Electric module
Symbol Description


Particulate lter


Compressor


Heat exchanger
Cooling


Central heating
systems


Domestic hot water
Relief valve
Additional heat source
Basic connection diagram
Chapter 4 | Pipe connections
HT 6Split
HT 12Split
The control mechanism of HT 6Split / HT 12Split al-
lows for two cooling operation systems to be used:
• 2-pipe cooling system,
• 4-pipe cooling system.

11HT 6Split
HT 12Split Chapter 4 | Pipe connections
The operating principle of the 2-pipe system is to
use the same installation for cooling operation as
for heating (Diagram of 2-pipe cooling operation). In
the 2-pipe system, the control mechanism operates
all components of the system i.e. GP10, expansion
The operating principle of the 4-pipe system is to use
separate heating and cooling circuits. In the 4-pipe sys-
tem, a cooling tank is required. The BT64 sensor should
be placed in the bu󰀨er vessel or on the cooling ow
Diagram of 2-pipe cooling operation
Diagram of 4-pipe cooling operation
modules (additional heating/cooling circuits) etc. Se-
lection of the 2-pipe system can be found in the SER-
VICE section, menu 5.2.4.
pipeline. BT64 is connected at the AUX inputs. Selec-
tion of the 4-pipe system can be found in the SERVICE
section, menu 5.2.4.
XL10
XL1
XL2
-EB101
-BT1
BA-SVM 10-200
-GP11
P
XL18XL19
HS1 -BP4
-BT15
-BT3
-GP12 -BT25
-QN12 -BT63
-BT71
-QN10
-BT7
-BT6
P
-BT2
-BT3
-QN11
-GP20
AA25
EQ-BT25/BT64
-BT12
XL10
XL1
XL2
-EB101
-BT1
-BT64
BA-SVM 10-200
-GP13
P
XL18XL19
HS1 -BP4
-BT15
-BT12
-BT3
-GP12 -BT25
-QN12 -BT63
-BT71
-QN10
-BT7
-BT6
P
EQ-BT25/BT64
-GP11
HT 6Split
HT 12Split
HT 6Split
HT 12Split

12 HT 6Split
HT 12Split
Indoor HT 6Split / HT 12Split module
• It is recommended that the HT 6Split / HT 12Split
module should be installed in a room with a oor
drain, at best in a utility room or a boiler house.
• The oor must be solid, concrete at best.
• The HT 6Split / HT 12Split module must be set
with its back to the outer wall, at best in a room
where noise is not a problem. If possible, do not
place the device near a wall of a bedroom or an-
other room where noise might be a problem.
• The device can be leveled using regulated legs.
• Pipes must be led in such a way that they are not
adjacent to the bedroom or living room.
• Remember to leave about 800 mm free space at
the front and 220 mm over the device to provide
for future maintenance.
1. Connect HT 6Split / HT 12Split module to the
heating system, cold, and hot water pipelines.
2. Install the cooling medium pipes.
3. Connect the outdoor temperature sensor, and ca-
bles between HT 6Split / HT 12Split and LSplit.
4. Connect power supply to module HT 6Split / HT
12Split.
5. Proceed according to start-up instructions in
chapter Start-up and regulation.
Recommended order of assembly
P
SHK 200S
SHK 200S-6
XL10
XL18XL19
XL1
XL2
-EB101
-BT1
HS1 -BP4
-BT15
-BT3
-GP12
-BT64
-BT25
-QN12 -BT63
-BT71
-QN10
-BT7
-BT6
P
Scheme with the connection of an additional heat source
Chapter 4 | Pipe connections
HT 6Split
HT 12Split

13HT 6Split
HT 12Split
Pipe connections
Pipe connections
XL1 Connection, Heating medium supply
Ø22 mm
XL2 Connection, Heating medium return
Ø22 mm
XL3 Connection, cold water Ø22 mm
XL4 Connection, hot water Ø22 mm
XL5 Connection, circulation Ø15 mm
XL10 Connection, cooling Ø22 mm
XL11 Connection, safety group
Ø22 mm, manometer
XL13 Liquid cooling medium
Connection ¼” (HT 6Split)
Connection ⅜” (HT 12Split)
XL14 Gas cooling medium
Connection ½” (HT 6Split)
Connection ⅝” (HT 12Split)
XL 18 Connection, returnto anadditionalheat source
Ø22 mm
XL 19 Connection, supply from additional heat
source Ø22 mm
Other information
PF3 Serial number plate
Chapter 4 | Pipe connections
20-40
1589 115
XL11
XL10
XL4 XL5 XL3 XL2 XL1
XL14
XL13
PF3
600.5
610.5
300
156
93.5 92.5 87 63 55
65
155
44
152
XL18
XL19
103mm
XL11 XL10 XL4 XL13 XL14 XL3
XL2
XL1

14 HT 6Split
HT 12Split
Chapter 4 | Pipe connections
Connection options
Compatible heat pumps air/water by
alpha innotec with unit HT 6Split / HT
12Split
Connecting the heating system
Indoor HT 6Split / HT12Split units can cooperate with
external units of Split type. Compatible heat pumps
LSplit include:
An external heat source, eg a gas or oil boiler, can be
connected to the back of the HT 6Split / HT 12Split,
removing the access block to the connection sockets
(picture below). Scheme on page 11.
The HT 6Split / HT 12Split module is equipped with a
condensate hose in the heat exchanger section. The
hose drains all condensate away from the device to
minimize the risk of damage. If necessary, the hose can
be extended.
Refrigerant pipes must be installed between the ex-
ternal module LSplit and HT 6Split / HT 12Split .
The installation must be executed according to the
applicable standards and directives.
Conden-
sate hose
Supply from
additional heat
source (XL 19)
Return to an
additional heat
source (XL 18)
Limitations
• Maximum pipe length, L6Split, L8Split, L12Split
is L=30 m.
• Maximum height di󰀨erence (H): ±7 m.
• Connection of the outdoor unit to the indoor unit
must ensure free movement of the refrigerant.
Pipe connections of the heating system are to be
made at the top.
• All the required protections and cut-o󰀨 valves
must be installed as close to the HT 6Split / HT
12Split module as possible.
• Where necessary, install the vents.
• Safety valve with a nanometer at the central heat-
ing circuit and the safety valve at the hot water
system must be installed on relevant conductors
XL 11 and XL 4. In order to prevent air sockets,
the overow pipe must be slanted at the entire
length from the safety valve, and must be se-
cured against freezing.
• When connecting to the installation where all
heaters have been equipped with thermostat
valves, install a discharge valve or remove sever-
al thermostats to assure appropriate ow.
Symbol Application
L6Split HT 6Split
L8Split HT 12Split
L12Split
IMPORTANT
The term “heating system”, as used in this installation
and operation manual, shall mean the heating or cool-
ing system supplied with a hot or cold medium from
the HT 6Split / HT 12Split module for heating or cool-
ing purposes.
Connection of the external heat source
Condensate elimination
Connecting refrigerant pipes
(not supplied)
More information about LSplit to be found at
https://www.alpha-innotec.com/ and in relevant in-
stallation manuals for accessories used.
Chapter Accessories can serve to check the list of ac-
cessories to be used with HT 6Split / HT 12Split.
CAUTION
Suitable safety valve must be installed directly on the
cold water supply line to the hot water tank. Safety
valve will protect against excessive increase of pres-
sure.
CAUTION
The outdoor unit, factory-lled with refrigerant, enables
the use of refrigerant pipes (dimension L) between the
outdoor unit and the indoor unit measured with a length
of L = 15m. The maximum permissible length of the re-
frigerant pipes can be 30m, but this requires topping up
the installation with a refrigerant.
L
H
L
H
HK 200S
HK 200S
AMS 10
AMS 10
HT 6Split / HT 12Split
HT 6Split / HT 12Split
LSplit
LSplit

15HT 6Split
HT 12Split
Pipe dimensions and materials
HT 12Split Gas pipe Liquid pipe
Pipereplacement Ø15,88 mm (5/8”) Ø9,52 mm (3/8”)
Connection Connection – (5/8") Connection – (3/8”)
Material Quality of copper SS-EN 12735-1 or
C1220T, JIS H3300
Minimum ma-
terial thickness 1,0 mm 0,8 mm
External diam-
eter, copper
pipe (mm)
B, using
R410A (mm)
B, using a
conventional
tool (mm)
Ø 9,52
0,0~0,5 0,7~1,3
Ø 15,88
Ø 6,35 1,0~1,5
Ø 12,7
External
diameter,
copper
pipe (mm)
Torque
(Nm)
Tightening
angle
(°)
Recom-
mended
tool length
(mm)
Ø6,35 14~18 45~60 100
Ø 9,52 34~42 30~45 200
Ø12,7 49~61 30~45 250
Ø 15,88 68~82 15~20 300
Pipe connection
• Execute the pipe installation with the mainte-
nance valves (QM35, QM36) closed.
• L6Split / L8Split: Remove the side panel on LSplit
during the installation to make access easier. Socket connections
Extension:
Shift:
• L12Split:Remove the “to be removed” part from
the external panel at the LSplit mode where pipes
are to be led. The drawing below presents exem-
plary pipe outlets.
• Make sure that no water or dirt can permeate to the
pipes. Contamination of the pipes may damage
the heat pump.
A
B
Vacuum
pump
Serviceventil, gas
Mätuttag
Manometer
Serviceventil, vätska
Zawór serwisowy,
ciecz
Zawór serwisowy,
gaz
Wyjście pomiarowe
Manometr
Pompa
próżniowa
A
B
Vacuum
pump
Serviceventil, gas
Mätuttag
Manometer
Serviceventil, vätska
Zawór serwisowy,
ciecz
Zawór serwisowy,
gaz
Wyjście pomiarowe
Manometr
Pompa
próżniowa
A
B
Vacuum
pump
Serviceventil, gas
Mätuttag
Manometer
Serviceventil, vätska
Zawór serwisowy,
ciecz
Zawór serwisowy,
gaz
Wyjście pomiarowe
Manometr
Pompa
próżniowa
IMPORTANT
When soldering, apply the shielding gas.
External diameter,
copper pipe A (mm)
Ø 6,35 9,1
Ø 9,52 13,2
Ø 12,7 16,6
Ø 15,88 19,7
HT 12Split
HT 6Split
• Bend pipes with maximum bending radius (at
least R100~R150). Do not bend pipes many
times. Use a bending machine.
• Connection of refrigerant pipes to the outdoor unit
and indoor unit should be perform with are con-
nections after prior dismantling of production ends.
• Connect the socket connection and tighten with
appropriate torque. Apply the appropriate tight-
ening angle if the torque wrench is not available.
HT 6Split Gas pipe Liquid pipe
Pipe replace-
ment Ø12,7 mm (1/2”) Ø6,35 mm (1/4”)
Connection Connection – (1/2") Connection – (1/4”)
Material Quality of copper SS-EN 12735-1 or
C1220T, JIS H3300
Minimum ma-
terial thickness 1,0 mm 0,8 mm
Front
Elements to be removed
Chapter 4 | Pipe connections

16 HT 6Split
HT 12Split
Pressure test and leakage test
Vacuum pump Insulation of cooling medium pipes
Filling the system with a cooling medium
A
B
Vacuum
pump
Serviceventil, gas
Mätuttag
Manometer
Serviceventil, vätska
Zawór serwisowy,
ciecz
Zawór serwisowy,
gaz
Wyjście pomiarowe
Manometr
Pompa
próżniowa
Both HT 6Split / HT 12Split and LSplit are facto-
ry-tested for pressure and leakage, but pipe connec-
tions between the devices must be checked when the
installation has been completed.
When executing pipe connections, pressure tests,
leakage tests and vacuum tests, maintenance valves
(QM35, QM36) must be closed. To ll the pipes and
HT 6Split / HT12Split with a refrigerant medium main-
tenance valves should be opened again.
Connections:
Principle:
• Cooling medium (both gas and liquid) pipes must
be insulated to provide thermal insulation and
prevent condensation.
• Apply insulation that can sustain at least 120°C.
Use a vacuum pump to remove all air. Turn on ex-
traction for at least one hour. Final pressure, after
emptying, must total 1 mbar (100 Pa, 0.75 Tr or 750
microns) of absolute pressure. If the system is still
moist or is leaking, negative pressure will grow after
the end of emptying.
IMPORTANT
Pipe connections between devices must undergo a
pressure test and leakage test after completing the in-
stallation process, according to applicable regulations.
Use nitrogen only for system compression and rinsing.
ADVICE
In order to achieve a better nal e󰀨ect and to acceler-
ate emptying, follow the following sections.
• Pipelines should have the largest diameter possi-
ble, and be as short as possible.
• Empty the system to 4 mbar and ll it with dry ni-
trogen to atmospheric pressure to end emptying.
LSplit is supplied together with a cooling medium for
cooling medium of max. length of 15 m. If the length
of the cooling medium pipes exceeds 15 m, supple-
ment the cooling medium in the volume of 0.06 kg/m
for HT 12Split and 0.02 kg/m for HT 6Split.
IMPORTANT
In the case of systems with cooling medium pipes with
the length of up to 15 m, the supplied volume of the
cooling medium is su󰀩cient.
Wires for connecting indoor
and outdoor units Exterior tape
Gas piping
Insulation
Liquid piping
Okablowanie
Rura z cieczą
Taśma
Rura gazowa
Izolacja
Przyłącza:
Band (accessory) Pipe cover (accessory)
Zworka Zabezpieczenie rury
Wires for connecting indoor
and outdoor units Exterior tape
Gas piping
Insulation
Liquid piping
Okablowanie
Rura z cieczą
Taśma
Rura gazowa
Izolacja
Przyłącza:
Band (accessory) Pipe cover (accessory)
Zworka Zabezpieczenie rury
Chapter 4 | Pipe connections
Measurement output
Maintenance
valve - liquid
Maintenance
valve - gas
Manometer
Vacuum
pump
Cabling Tape
Gas pipe
Insulation
Pipe for liquid
Jumper Pipe protection
CAUTION
All connections and work related to the refrigeration
system must be made by a person with appropriate
authorizations and certicates.
CAUTION
The maximum permissible length of the refrigerant pipes
can be 30m, but this requires topping up the installation
with a refrigerant after exceeding 15m.

17HT 6Split
HT 12Split
Connections
LSplit can be connected in many various ways.
More information on connections to be found at web-
site https://www.alpha-innotec.com/
L6Split L8Split L12Split
Max pressure, climate system 0,25 MPa (2,5 Bar)
Highest recommended supply/return temperature at dimensioned
outdoor temperature 55/45 °C
Max temperature in HT 6Split / HT 12Split +65 °C
Max ow line temperature with compressor +58 °C
Min supply temperature cooling +7 °C
Max supply temp. cooling +25 °C
Min volume, climate system during heating, cooling* 50 l 80 l 100 l
Min volume, climate system during under oor cooling* 80 l 100 l
Max ow, climate system 0,38 l/s 0,57 l/s
Min ow, climate system, 100% circulation pump speed
(defrosting ow) 0,19 l/s 0,29 l/s
Min ow, heating system 0,12 l/s 0,15 l/s
Min ow, cooling system 0,16 l/s 0,20 l/s
*-Regards circulating volume
Chapter 4 | Pipe connections

18 HT 6Split
HT 12Split
Connection to the heat pump
Connection when operating without a
heat pump
Connection of hot and cold water
No change is required to the hydraulic connections
conguration for the internal unit to operate individu-
ally, without an external unit.
Connection options
Chapter 4 | Pipe connections
IMPORTANT
Water supply uti lity must have necessarily installed
safety valve which will protect against excessive in-
crease of pressure.
IMPORTANT
Do not use the heater if there is a blockage of the safe-
ty valve.
IMPORTANT
Installation of any narrowing (e.g. reducers, lters etc.)
and shut-o󰀨 valves between the heater and the safety
valve is not allowed. It is only permitted mounting three-
way adapter with drain valve that allows to empty the
tank and three-way adapter with expansion vessel.
P
P
P
-BT6
P
P
P
The HT 6Split / HT 12Split unit is not equipped with a
shut-o󰀨 valve for the central heating system, hot water
system or electric additional heat; these must be in-
stalled on the outside of the indoor unit to facilitate any
future servicing.
The hot water tank should be connected to a water
supply system with water pressure of min. 1 bar,
max. 10 bar. If the pressure at the cold water inlet to
the tank is higher than the permissible level, use a
pressure reducer. During heating of the water in the
tank, the pressure increases, which is why each tank
must be equipped with the appropriate safety valve,
installed on the cold water supply, which will protect
the tank against an excessive increase in pressure.
If using hot water circulation, see subsection “DHW
circulation”.

19HT 6Split
HT 12Split
When connecting to a system with thermostatic
valves on all radiators/underoor heating pipes, use
the appropriate hydraulic solutions which ensure the
proper heating medium volume and minimum, undis-
turbed ow. See the subsection “Bu󰀨er vessel”.
Heating system connection
The system can be extended with additional heating cir-
cuits only when provided an additional expansion card
After using an EP Split card, an additional heating circuit
can be activated in the controller.
Connecting an additional heating circuit
Additional accessories and options and how to con-
nect them are described in the EP Split manual.
Chapter 4 | Pipe connections
P
P
P
P
-BT25
Connecting the 2-pipe cooling operation
system
In the 2-pipe cooling operation system, the sensor
BT64 / EQ-BT25 assumes the function of sensor
BT25. Degree minutes are counted according to EQ-
BT25.
P
P
EQ-BT25/
BT64
-BT63
-BT25
IMPORTANT
The heat pump should have cooling insulation and are
working in an intermittent mode.
Connecting the 4-pipe cooling operation
system
The 4-pipe system requires an additional cooling
bu󰀨er vessel. Sensor BT64 must be transferred to
the bu󰀨er vessel. Degree minutes for heating are
counted according to BT25. Degree minutes for cool-
ing operation are counted according to BT 64.
-BT64
P
P
EQ-BT25/BT64 -BT25

20 HT 6Split
HT 12Split
IMPORTANT
If connection AA3: X7 is used for another purpose, an
additional EP Split accessory is required to connect the
hot water circulation pump control.
DHW circulation
The HT 6Split / HT 12Split have possibility to connect
DHW circulation. The circulation connection (XL5) is
located at the top of the tank.
To connect the circulation:
1. Remove the XL5 plug from the top of the housing.
520
120
2. Remove the front panel, then move the control
box to the right to gain access, to the hydraulic
connections.
3. Remove the plug from the circulation pipe (XL5).
4. Fit an elbow (not included in HT 6Split / HT 12Split)
facing towards the back of the casing, into the
circulation connection port.
5. Connect the pipe to the elbow, dimensions as
shown in the drawing below, routing it out at the
top of the casing, where the XL5 plug is located.
6. Fit a circulation pump at the outlet of the pipe from
the HT 6Split / HT 12Split unit, and then connect its
control to the controller.
7. Replace the control box and the front panel.
Chapter 4 | Pipe connections
Dimensions of the
pipe for circulation elbow 15x15
XL5
XL5
P
P
Connecting the control of the hot water circulation pump
The hot water circulation pump can be connected in
two con gurations:
• to board AA3:X7 on block AA3-X7:-NO (230V),
and N, PE from block X1.
1
0 PE 2
L
N
PE
3
2
3
4
5
6
7
8
9
Expansion Card External
GP11
X1
AA5-X9
Accessory board AA5 External
PE
L N
X1
L
L
N
N
PE
PE
1 2 3
ExternalX1
BA-SVM
10-200
GP11
AA3:X7
C NO NC
AA3-X7
P
• in case AA3:X7 output is already in use, to acces-
sory board AA5 (not included in HT 6Split / HT
12Split) on block AA5-X9:8 (230V), AA5-X9:7 (N)
and X1:PE
HT 6Split /
HT 12Split