Gebwell T2 User manual

Installation, operation and
maintenance manual
T2 heat pump
WWW.GEBWELL.COM

2 Gebwell T² Installation, Operation and Maintenance Manual
Contents
1 WARRANTY ...................................................................................................................................................................................... 6
2 INSTALLATION RECORD ............................................................................................................................................................... 8
3 HEAT PUMP OPERATING INSTRUCTIONS .................................................................................................................................. 9
3.1 General .................................................................................................................................................................... 9
3.2 Ground source heat energy ..................................................................................................................................... 9
3.3 Ground source cooling ............................................................................................................................................ 9
3.4 Heat pump’s operating principle ............................................................................................................................. 9
3.5 Heating functions .................................................................................................................................................. 10
3.6 Tips for saving ...................................................................................................................................................... 10
4 DELIVERY AND HANDLING ....................................................................................................................................................... 11
4.1 Delivery contents .................................................................................................................................................. 11
4.2 Optional accessories ............................................................................................................................................. 11
4.3 Storage .................................................................................................................................................................. 11
4.4 Transport ............................................................................................................................................................... 11
4.5 Removing the packaging ...................................................................................................................................... 11
4.6 Safety instructions ................................................................................................................................................ 11
4.7 Heat pump’s location ............................................................................................................................................ 12
5 HEAT PUMP’S STRUCTURE ......................................................................................................................................................... 12
5.1 T206 – T216 structure ............................................................................................................................................ 12
5.2 T220 – T232 structure ............................................................................................................................................ 12
5.3 Sensor locations .................................................................................................................................................... 13
5.4 Sensors .................................................................................................................................................................. 13
5.5 Pumps ................................................................................................................................................................... 13
5.6 Control valves ....................................................................................................................................................... 14
5.7 Other controls ....................................................................................................................................................... 14
6 DIMENSIONS AND PIPE CONNECTIONS ................................................................................................................................... 14
6.1 Heat pump dimensions ......................................................................................................................................... 14
6.2 Pipe connections ................................................................................................................................................... 14
7 PIPE INSTALLATION ..................................................................................................................................................................... 15
7.1 Collector ............................................................................................................................................................... 15
7.2 Connecting ground cooling ................................................................................................................................... 17
7.3 Charging circuit .................................................................................................................................................... 18
7.4 Connections of an additional heat source ............................................................................................................. 19
7.5 Connections of a fixed fuel boiler ......................................................................................................................... 19
7.6 Connecting the domestic water system ................................................................................................................. 19
7.7 Cascade connections ............................................................................................................................................. 20
8 ACCESSORIES ................................................................................................................................................................................. 2 1
8.1 General .................................................................................................................................................................. 21
8.2 Room sensor QAA55. ........................................................................................................................................... 21
8.3 Wireless room unit QAA78 .................................................................................................................................. 21

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8.4 Wired room unit QAA74 ...................................................................................................................................... 21
8.5 Change-over valve ................................................................................................................................................ 21
8.6 Heating control group / pump circuit .................................................................................................................... 21
8.7 Collector valve group ............................................................................................................................................ 22
8.8 Hot water package ................................................................................................................................................. 22
8.9 Electrical heater of supply water ........................................................................................................................... 22
8.10 Contactor centre .................................................................................................................................................... 22
8.11 SmartWEB remote control .................................................................................................................................... 22
8.12 Cooling control ..................................................................................................................................................... 22
8.13 Cooling control group ........................................................................................................................................... 23
8.14 Control of additional heat source .......................................................................................................................... 23
8.15 Control of fixed fuel boiler ................................................................................................................................... 23
8.16 Modbus 350 communication module .................................................................................................................... 23
8.17 Energy measurement ............................................................................................................................................. 23
9 ELECTRICAL CONNECTIONS ...................................................................................................................................................... 23
9.1 General .................................................................................................................................................................. 23
9.2 Power supply ......................................................................................................................................................... 24
9.3 Overheat protector of the flow-through resistor .................................................................................................... 24
9.4 Compressor’s motor protection switch (F1) .......................................................................................................... 24
9.5 Phase sequence / soft starter .................................................................................................................................. 24
9.6 Outdoor sensor ...................................................................................................................................................... 24
9.7 Supply water’s electrical heater ............................................................................................................................ 24
9.8 Accumulator’s resistor control .............................................................................................................................. 24
9.9 Change-over valve(s) ............................................................................................................................................ 25
9.10 Heating circuits ..................................................................................................................................................... 25
9.11 Domestic hot water’s circulation pump ................................................................................................................. 26
9.12 Hot water package with mixing valve ................................................................................................................... 26
9.13 Hot water package with heat exchanger ................................................................................................................ 26
9.14 Connection of external source pump ..................................................................................................................... 26
9.15 Room sensor (accessory) QAA55. ........................................................................................................................ 27
9.16 Room unit (accessory) QAA75. ............................................................................................................................ 27
9.17 Alarm forwarding .................................................................................................................................................. 27
9.18 External control of the source pump ..................................................................................................................... 27
9.19 Home/Away switch ............................................................................................................................................... 27
9.20 Call for heating 0-10V .......................................................................................................................................... 27
9.21 External prevention of activation .......................................................................................................................... 27
9.22 Tariff control ......................................................................................................................................................... 27
9.23 Installation of extension module ........................................................................................................................... 28
9.24 Connection of a cascade connection ..................................................................................................................... 28
10 FILLING AND VENTING ................................................................................................................................................................ 28
10.1 Heating system ...................................................................................................................................................... 28

4 Gebwell T² Installation, Operation and Maintenance Manual
10.2 Filling the collector, non-pressurised .................................................................................................................... 28
10.3 Filling the collector, pressurised ........................................................................................................................... 29
10.4 Pressure test of the collector ................................................................................................................................. 29
10.5 Venting of the collector’s horizontal piping ......................................................................................................... 29
10.6 Cleaning the collector filter .................................................................................................................................. 30
11 ACTIVATING THE HEAT PUMP ................................................................................................................................................... 30
11.1 Before activation ................................................................................................................................................... 30
11.2 Activation ............................................................................................................................................................. 30
11.3 Venting ................................................................................................................................................................. 31
11.4 Venting the heat supply circuit ............................................................................................................................. 32
11.5 Commissioning of an external source pump. Devices T220, T226 and T232 ........................................................ 32
11.6 Use without a collector and use during construction site ...................................................................................... 33
11.7 Activation of a cascade system ............................................................................................................................. 33
12 HEAT PUMP OPERATION .............................................................................................................................................................. 33
12.1 User interface ........................................................................................................................................................ 33
12.2 User terminals ....................................................................................................................................................... 34
12.3 Display symbols.................................................................................................................................................... 34
12.4 User levels ............................................................................................................................................................ 34
12.5 Heating settings .................................................................................................................................................... 35
12.6 Selecting heating mode ......................................................................................................................................... 35
12.7 Domestic hot water settings .................................................................................................................................. 36
12.8 Resetting the heat pump ........................................................................................................................................ 36
13 SITE-SPECIFIC DEFINITION ......................................................................................................................................................... 37
13.1 Time and date ....................................................................................................................................................... 37
13.2 Summer/winter switch connection ........................................................................................................................ 37
13.3 Language selection ............................................................................................................................................... 37
13.4 Time programs ...................................................................................................................................................... 37
13.5 Heating area (Heating circuit) ............................................................................................................................... 37
13.6 Domestic hot water ............................................................................................................................................... 38
13.7 Domestic hot water circulation pump ................................................................................................................... 39
13.8 Cooling circuit ...................................................................................................................................................... 39
13.9 Heat pump settings ............................................................................................................................................... 41
13.10 Programming the accumulator’s resistors and supply water’s electrical heaters .................................................. 42
13.11 Control of additional heat source .......................................................................................................................... 44
13.12 Control of fixed fuel boiler ................................................................................................................................... 45
13.13 Call for heating (VAK control) ............................................................................................................................. 45
13.14 ModBus communication ....................................................................................................................................... 45
14 SYSTEM INFO ................................................................................................................................................................................. 4 5
14.1 Special situations .................................................................................................................................................. 45
14.2 Heat pump status ................................................................................................................................................... 45
14.3 Heating circuits’ status information ...................................................................................................................... 46

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14.4 Domestic hot water status information .................................................................................................................. 46
14.5 Measurements ....................................................................................................................................................... 46
15 FAILURES ........................................................................................................................................................................................ 48
15.1 Alerts ..................................................................................................................................................................... 48
15.2 Troubleshooting .................................................................................................................................................... 48
15.3 Troubleshooting table ............................................................................................................................................ 50
16 MAINTAINING AND SERVICING THE HEATPUMP .................................................................................................................. 53
16.1 Maintenance notice ............................................................................................................................................... 53
16.2 Inspections ............................................................................................................................................................ 53
16.3 Nominal curves of sensors .................................................................................................................................... 53
16.4 Testing inputs and outputs .................................................................................................................................... 53
17 TECHNICAL SPECIFICATIONS .................................................................................................................................................... 55
18 CONTROLLER’S CONNECTION POINTS .................................................................................................................................... 57
19 SETPOINT EXAMPLES FOR HEAT PUMP ADJUSTMENTS IN DIFFERENT HEATING NETWORKS ................................. 58
20 MAINTENANCE RECORD ............................................................................................................................................................. 59
21 ENERGY LABELS ........................................................................................................................................................................... 60
APPENDIX 1: ELECTRICAL DIAGRAMS
APPENDIX 2: DECLARATION OF CONFORMITY

6 Gebwell T² Installation, Operation and Maintenance Manual
1 WARRANTY
Gebwell Ltd.
Patruunapolku 5, 79100 LEPPÄVIRTA, tel [phone], [e-mail]
issues the product,
T2 heat pump
a warranty regarding manufacturing and material faults, with the following contents.
Warranty period and start date
A two- (2) year warranty will be issued to this product, counting
from the product delivery date.
Two copies of the commissioning and warranty protocol will be
delivered with the heat pump. The installer / reseller of the heat
pump fills the said protocol in and goes over it with the customer.
Both Parties confirm they have gone over the protocol, and
accept the terms of warranty with their signature. The customer’s
copy of the warranty protocol must be stored, and presented on
request. The other copy must be delivered to the factory within
1 month from the product commissioning date. The warranty is
not valid in case the commissioning and warranty protocol has
not been filled in correctly, or if the factory copy has not been
returned to the factory.
Warranty contents
The warranty extends to all manufacturing and raw material
faults that have occurred in this product during the warranty
period, as well as the direct expenses related to the changing of
these devices.
The buyer is responsible for any device malfunctions caused by
the storage conditions between the delivery and commissioning
date (cf. installation, operating and maintenance manual;
storage).
5-year component warranty
In addition to the normal product warranty, a five- (5) year
component warranty will be issued to the heat plate exchangers,
starting from the product delivery date.
The component warranty does not extend to the direct or indirect
expenses caused by the changing of a component. Otherwise, all
terms and limitations of the product warranty apply for the
component warranty, as well.
Warranty limits
The warranty does not extend to the expenses (travel, power
consumption, etc.) caused by a malfunctioning device, the
buyer’s production loss, loss of earnings or other indirect
expenses.
This warranty has been given on the condition that the product
is working in normal operating conditions, and that the operating
instructions are followed carefully. The liability of the guarantor
is limited according to these terms and conditions, and the
warranty does not extend to such damage as the product may
cause to another item or person.
The warranty does not extend to direct personal injuries or
damage to property caused by the delivered product.
The warranty presupposes that the installation has followed all
valid regulations, generally accepted methods of installation and
installation instructions given by the manufacturer of the
product.
The warranty does not extend to or is not valid in case the
product is used in any other way than required by the sizing.
The customer is obliged to perform a visual check on the product
before the installation, and it is not allowed to install a product
that is clearly faulty
The warranty does not cover malfunctions, which have been
caused by
• the transportation of the product
• the carelessness of the product operator, the overload
of the product, the failure of adhering to the operating
instructions or maintenance
• circumstances beyond the guarantor’s control, such as
voltage fluctuations (the maximum range of voltage
fluctuations is +/- 10%), lightning, fire or accidents
other than those caused by the repair work,
maintenance or structural changes done by authorised
resellers
• product installation or positioning on the operating
site, which is in contradiction with the installation,
operating and maintenance manual, or otherwise
incorrect.
The warranty does not extend to the repair of defects that are
insignificant as far as the product’s operating condition is
concerned, such as surface scratches. The warranty does not
extend to the normal adjustments of the product as outlined in
the operating manual, operation training visits, maintenance and
cleaning measures, or such work which is caused by the neglect
of safety or installation regulations or the settlement of this on
the installation site.
The warranty terms outlined in the joint recommendation of the
Association of Finnish Metal and Engineering Industries and the
Finnish Competition and Consumer Authority are observed to
such an extent which has not been separately mentioned above.
The warranty becomes void, if the product is
• repaired or altered without Gebwell Ltd.’s permission
• used for a purpose, for which it has not been intended
• stored in a humid or otherwise unsuitable location (cf.
installation, operating and maintenance manual).

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What to do if a malfunction occurs
If a malfunction occurs during the warranty period, the customer
must immediately (normally within 14 days) notify the
authorised Gebwell reseller from whom the product was bought.
The notification must include which product has malfunctioned
(product model, serial number), the details of the malfunction in
as much detail as possible, as well as the circumstances when the
malfunction has developed and/or occurs. The warranty form,
correctly filled in at the handover time must be submitted on
request. Appealing to a warranty-period notification is not valid
after the warranty period is over, unless the notification has been
submitted in writing during the warranty period.
The notification must be submitted immediately after the
malfunction has been discovered. If the notification is not
submitted immediately once the buyer has noticed the
malfunction, or when the buyer should have noticed the
malfunction, the buyer loses the right to appeal to this warranty.
Maintenance service in Finland
Maintenance work for this product, during the warranty period
and after the warranty period, is performed by the maintenance
organization authorised by the manufacturer, throughout the
entire estimated economic life of the heat pump.
How to submit a service request
All warranty repairs, service requests and orders for spare parts
will primarily be submitted directly to the authorised Gebwell
reseller that sold/delivered the product. Before submitting a
service request, the following things must be taken into
consideration:
1. read the installation, operating and maintenance
manual carefully and think whether you have used
the device in accordance with the instructions in the
manuals
2. before submitting a warranty repair request, ensure
that the warranty period is still valid, read the
warranty terms carefully and find out the product’s
model and serial numbers
3. all parts belonging to a device must be included when
the device is returned
4. the returned product must be closed in such a way,
that handling it would not cause health or
environmental hazards.
A device changed on the basis of the warranty is the property of
the device manufacturer. Gebwell Ltd. reserves the right to
decide how, where and who will perform the repair work or
change that is at the manufacturer’s responsibility.
Gebwell Ltd. is not liable for the breakdown of a wrongfully
installed device.
The device can only be repaired by a professional. Incorrect
repair work and settings can cause danger for the user, the
malfunction of the device, and weaken the efficiency of the
device. The visit of a retailer or a service agent is not free of
charge even during the warranty period, in case the device has to
be repaired due to incorrect installation, repair or adjustment.
ALWAYS KEEP THE OPERATING MANUAL IN THE IMMEDIATE VICINITY OF THE DEVICE!
Carefully study the manual before installing, adjusting or maintaining the device. Observe the instructions provided. Request
a technician to fill out the Commissioning and Warranty Protocoll, which must be returned to the device manufacturer. The
protocoll is a requirement for maintaining the validity of the manufacturer’s warranty.
Fill out the information below. This information must be available if the device experiences any failures.
Model: Serial number:
HVAC company: Name:
Date: Tel.:
Electrician: Name:
Date: Tel.:

8 Gebwell T² Installation, Operation and Maintenance Manual
2 INSTALLATION RECORD
The heating system must be inspected before commissioning following in-force regulations. Only qualified persons may
conduct the inspection. The below installation record must be filled out before handing the device over to the end user. The
completed installation record is also a condition for the validity of the warranty.
x Description Note: Inspected by: Date:
Collector:
System pressure tested
System flushed
System vented
Brine
Expansion vessel
Mud separator
Safety valve
Shut-off valve
Collector loop 1, length
Collector loop 2, length
Collector loop 3, length
Collector loop 4, length
x Description Note: Inspected by: Date:
Heating system:
System pressure tested
System flushed
System vented
Safety valve
Diaphragm expansion vessel
Mud separator
Pressure gauge
Shut-off valve
Admission valve
Buffer accumulator
x Description Note: Inspected by: Date:
Domestic water:
System pressure tested
System flushed
Safety valve
Pressure gauge
Buffer accumulator
x Description Note: Inspected by: Date:
Electricity:
Property fuses
Heat pump fuses
Phase sequence
32A power socket
Outdoor temperature sensor

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3 HEAT PUMP OPERATING
INSTRUCTIONS
3.1 General
Gebwell T is a perfect heat pump, which saves energy and
offers efficient technical possibilities. A well-designed
and appropriately dimensioned ground source heating
system is affordable in terms of operating expenses and
energy efficient. With a heat pump, you can efficiently
heat both interior air and domestic water. In summer, the
system can also be used to cool interior air in an
environmentally friendly fashion.
3.2 Ground source heat energy
A heat pump collects heat from the ground and transfers
it inside the building. The heat can be collected using
pipes sunk in a bored well, heat collection pipes installed
near the ground surface or pipes anchored at the bottom of
a water system.
Bored well as a heat source
Ground as a heat source
Water system as a heat source
More information on heat collection systems and their
scaling can be found on the website of Gebwell Ltd. and
the Finnish Heat Pump Association.
www.gebwell.com
www.sulpu.fi
3.3 Ground source cooling
The cold temperature of the brine can also be used to cool
dwellings. In summer, the free cooling energy can be
transferred from the ground with just a circulation pump.
The heat pump system can be connected to the convection
heaters of the ventilation system or an underfloor
heating/cooling system for cooling purposes.
3.4 Heat pump’s operating principle
The heat pump’s refrigerant circuit includes four main
components:
• Evaporator
• Compressor
• Condenser
• Expansion valve
The heat in the ground is absorbed into a liquid solution
circulating in the heat collection pipes.
In the evaporator, the liquid comes into contact with the
refrigerant that, when vaporised, binds heat energy from
the liquid solution that circulates in the ground. The liquid
solution returns to the ground about 4°C cooler than when
coming out to the surface. The lowest permissible
temperature for the liquid solution coming to the heat
pump is -5°C.
The compressor increases the pressure and temperature of
the refrigerant. The refrigerant also absorbs the heat
energy generated by the compressor’s operation.
The hot refrigerant is conveyed to the condenser, where
the heat energy of the refrigerant is transferred to the water
circulating in the building’s heating system. The
refrigerant condenses into liquid upon releasing heat
energy.

10 Gebwell T² Installation, Operation and Maintenance Manual
The pressure of the refrigerant remains high when being
transferred to the expansion valve. In the valve, the
refrigerant’s pressure decreases rapidly. From the
expansion valve, the refrigerant passes on to the
evaporator where it is once again evaporated. At this
point, the refrigerant absorbs heat from the liquid solution
circulating in the heat collection piping.
3.5 Heating functions
Domestic water
The heat pump produces domestic water based on the B3
measurement sensor. The domestic hot water’s switching
differential is 5 degrees. The compressor is factory set to
activate when the measurement value drops under +50°C
and deactivated when the value reaches +55°C.
Heating
The heat pump produces heating water directly into the
building’s heating network in accordance with the set
point that is created from the outdoor temperature and the
set heating curve. The control automation activates the
charging on the basis of the calculated set point and return
water measurement (B71) formed by the controller. The
heat pump’s return water switching differential (2840)
setting defines the compressor’s activation and
deactivation points. When the return water measurement
value is less than the set point by half of the return water
switching differential, the compressor is activated. The
compressor turns off when the return water measurement
value reaches the set point + half of the return water
switching differential. The automation reduces
temperature rise in the return water set point above the
condenser.
Example: Return water switching differential (2840) 6°C.
Supply water set point: 30°C. Condenser’s temperature
difference Δt 6K.
The charging procedure is activated when the return water
measurement value (B71) reaches 21°C. The charging
ends, when the return water measurement value is 27°C.
The heat pump’s charging pump rotates whenever it is in
heating mode.
Mixing heating circuit:
The heating circuit’s supply water set point is calculated
in accordance with the outdoor temperature measurement
and the set heating curve. The controller controls the 3-
way mixing valve and keeps the heating circuit’s supply
water temperature at the set point.
Heat supply and source pump:
In order for a heat pump to function at the best possible
efficiency, the conditions of the heating system and
collector must be ideal. The difference between the
heating system’s output and input temperatures must be
6°C–10°C and the output and input temperature difference
of the collector must be 3°C–4°C. Efficiency and savings
are reduced at temperature differences other than those
described above.
Factory settings:
Heat supply pump: 6°C
Source pump: 4°C
3.6 Tips for saving
The heat pump's function is to produce heat and domestic
hot water according to your wishes. The system aims to
fulfil these wishes by all means available, within the
framework of the set values.
Important factors affecting the energy consumption are
the interior temperature, hot water consumption, hot water
temperature level, the insulation level of the real estate, as
well as the desired level of comfort.
Please note the above points when making changes on the
device for settings.
IMPORTANT!
Thermostats for floor heating and radiators can have a
negative impact on energy consumption. They slow down
the flow in the heating system and the heat pump will
compensate this by raising the temperature of the network.
This will affect the operation of your device consuming
more electricity. Thermostats are designed to react only to
control of so-called free-heat (sun, heat generated by
people, fireplaces, etc. ...).

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4 DELIVERY AND
HANDLING
4.1 Delivery contents
• Heat pump
• Outdoor temperature sensor
• Operating, maintenance and installation manual
• Spare seals
• Commissioning and warranty protocoll
• External source pump, devices T220-T232
4.2 Optional accessories
• Spare valve
• Room sensor
• Collector valve group
• Pump heating circuit
• Heating control group
• Cooling control group
• SMS/WEB server, SMARTWEB
• Buffer accumulator for domestic water
• Buffer accumulator for heating
• Domestic water control group
• Charging package for domestic water
• Pool heating set
• Diaphragm expansion vessel for collector
• Diaphragm expansion vessel for heating
• Energy measurement
• Fixed fuel boiler control
• Additional heat source control
• Cooling control
• Modbus communication module
4.3 Storage
Before installation, the heat pump must be kept in its
delivery package in a dry and warm location.
4.4 Transport
The heat pump may be temporarily tilted, but it must not
be left inclined for a long period of time, not even in
transit. The heat pump’s maximum tilt angle is 20°. It is
not recommended to turn the pump on its side. However,
if there is a need to turn the heat pump on its side, for
transport purposes, for example, the compressor unit must
be removed for the duration of transit. In any case the heat
pump must not be transported on its back. If the heat pump
has been tilted in transit, you must allow the pump to stand
upright for at least two hours before activation so that the
compressor’s lubrication oil has time to reach the required
locations. Only lift the heat pump by the pallet. The pump
must be transported on the pallet all the way to the
installation location.
4.5 Removing the packaging
The product is packaged in protective plastic such that the
installation can be performed without removing the
plastic. The protective plastic can be kept in place to
protect the pump until activation.
• Ensure that you have received the correct products
with the correct accessories.
• Remove the packaging material, and before
installation, check that the heat pump has not been
damaged during transport. Inform of any possible
transport damage.
• Transport the heat pump near the planned installation
location.
• Lift the pump off its transport pallet.
• Adjust the pump so that it is level and stands firmly
on its adjustable legs.
• Ensure that the frame, with the exception of the
adjustable legs, is not in contact with the building’s
structures.
4.6 Safety instructions
The following safety instructions are to be taken into
account when handling, installing and using the
equipment.
• Turn off the device’s main switch before any
maintenance procedures
• Never compromise safety by bypassing safety
devices
• Only qualified personnel should conduct maintenance
/ repair measures on the cooling unit of the
equipment
• The heat pump is not to be flushed with water
• Keep all the shell plates in place to prevent water
splashing on the electronic components of the
equipment.

12 Gebwell T² Installation, Operation and Maintenance Manual
4.7 Heat pump’s location
A variety of matters related to safety, comfort of use and
maintenance must be considered when positioning the
heat pump.
The temperature of the location must be between +5°C
and +30°C. The room must be sufficiently ventilated. If
the humidity in the room is high, water condenses on the
cold pipe sections of the collector.
The heat pump compressor generates noise that may be
conveyed to other spaces via the building’s structures. It
is recommended to use flexible parts in the pipe
connections. The heat pump must be positioned in a way
that the sound does not disturb any living areas. If
necessary, soundproofing of the wall structures between
the room in which the pump is located and the living areas
can be reinforced and extra rubber pads installed under the
pump’s legs. We recommend placing the heat pump in a
separate technical room. The sound transmitted through
structures can be limited with the floor structures of the
pump room and other solutions. A separate cast floor cut
off from the building’s other spaces prevents noise from
being carried to living areas through the floor.
Reserve at least 700 mm of maintenance space in front of
the pump so that the compressor unit can be taken out for
maintenance. For the same reason, do not install the pump
below the floor surface. Leave free space behind the heat
pump to prevent the transfer of any vibrations.
5 HEAT PUMP’S
STRUCTURE
5.1 T206 – T216 structure
5.2 T220 – T232 structure
A. Heat pump’s main switch (Q1)
B. Operating terminal
C. Charge output
D. Supply water electrical heater (accessory)
E. Charge return

v2-7 24052017 13
F. Condenser
G. Charging pump (LP)
H. Drain valve, charging circuit
I. Control centre
J. Supply water electrical heater, operating switch
(accessory)
K. Brine to the ground
L. Brine from the ground
M. Cooling unit’s electrical connections
N. Compressor’s motor protection switch F1 and soft
starter
O. Maintenance shut-off low pressure (KP)
P. Maintenance shut-off high pressure (KP)
Q. Liquid inspection glass (KP)
R. Source pump (MLP) (T220-T232 external)
S. Compressor
T. Drain valve, collector
5.3 Sensor locations
a. Charge, flow sensor B21
b. Charge, return water sensor B71
c. Collector, inlet sensor B91
d. Collector, output sensor B92
5.4 Sensors
Inside the heat pump:
B81 Hot gas sensor
B91 Collector’s inlet sensor
B92 Collector outlet sensor
B21 Heat pump flow sensor
B71 Heat pump return water sensor
External sensors:
B9 Outdoor sensor
B10 Common flow sensor
Accumulator sensors:
B3 Domestic water
B4 Additional accumulator 1 (upper)
B41 Additional accumulator 2 (lower)
B42 Additional accumulator 3 (middle)
Heating circuit sensors:
B1 Supply water temperature sensor 1
B12 Supply water temperature sensor 2
B14 Supply water temperature sensor 3
Room sensors:
B5 Room sensor 1
B52 Room sensor 2
B53 Room sensor 3
Other sensors:
B13 Pool sensor
B16 Cooling flow sensor
B22 Fixed fuel boiler sensor
B38 Domestic water consumption sensor
5.5 Pumps
Inside the heat pump:
Q8 Source pump
(NOTE! T20-T30 external)
Q9 Charging pump
Heating circuit pumps:
Q2 Heating circuit pump 1
Q6 Heating circuit pump 2
Q20 Heating circuit pump 3
Domestic water pumps:
Q4 Domestic water circulating pump
Q34 Domestic water exchanger’s charging
pump
Other pumps:
Q10 Fixed fuel boiler pump
Q19 Pool pump
Q24 Cooling circuit pump

14 Gebwell T² Installation, Operation and Maintenance Manual
5.6 Control valves
Y1 / Y2 Heating circuit 1 (open / closed)
Y5 / Y6 Heating circuit 2 (open / closed)
Y11 / Y12 Heating circuit 3 (open / closed)
Y23 / Y24 Cooling circuit (open / closed)
Y33 / Y34 Domestic water (open / closed)
5.7 Other controls
Q3 Domestic water change-over valve
Y21 Cooling change-over valve
Y28 Cooling pump/change-over valve
6 DIMENSIONS AND PIPE
CONNECTIONS
6.1 Heat pump dimensions
6.2 Pipe connections
T206 – T216 T220 – T232
1 Charge output cu Ø 28mm cu Ø 35mm
2 Charge return cu Ø 28mm cu Ø 35mm
3 Brine from the
ground
cu Ø 28mm cu Ø 35mm
4 Brine to the
ground
cu Ø 28mm cu Ø 35mm

v2-7 24052017 15
7 PIPE INSTALLATION
7.1 Collector
When viewing from the front, the heat pump’s collector
pipes are at the right edge of the device.
NOTE! In T220, T226 and T232 devices the source pump
must be installed externally. The pump is delivered in
conjunction with the equipment delivery. It is
recommended that the pump is installed vertically to the
line from the ground. In this way, air does not accumulate
inside the pump.
• In the collector/brine, only use connection parts that
are intended for cold conditions.
• Install shut-off valves in the pipe connections as
close as possible to the heat pump.
• Place the level expansion vessel in the highest point
of the collector, in the incoming pipe before the
source pump.
• A dirt separator (filter) must be installed to the
collector’s line coming from the ground in
accordance with connection diagrams.
• Use supports insulated with rubber to support the
pipes.
• Mark the name of the heat collection liquid on the
level expansion vessel.
• Ensure that water does not spill on the pump or in the
electrical devices during operation.
• The collector must be pressure tested at a pressure of
3bar and the test pressure must be maintained for at
least 30 min.
• Insulate all of the building’s source/brine pipes with
closed-cell insulation in order to prevent water
condensation.
• Rinse the pipes of any installation debris prior to
installing the heat pump
When measuring the collection circuit, the geographical
location, soil type, heat pump’s efficiency and the
property’s heating needs must be taken into consideration.
When 40x4.2 PN6.3 PEM hoses are used
Device Recommended
length of collection
piping (m)
Recommended
active drilling
depth (m)
T206 250 – 2x250 100 - 160
T208 300 – 2x300 140 - 200
T210 400 – 2x400 170 – 2x120
T213 2x250 – 3x400 210 – 2x150
T216 2x300 – 4x400 2x140 – 2x190
T220 2x400 – 6x400 2x170 – 3x170
T226 3x300 – 8x400 2x210 – 3x180
T232 3x400 – 10x400 3x180 – 4x200
The table values are examples intended to be guidelines.
Before beginning installation, accurate calculations of the
building’s heat requirements must be prepared.
The maximum length for a single collector loop is 400 m.
If there is a need to install more piping, the piping must be
divided into two loops that are connected in parallel. The
connection must be conducted so that the loop flow can be
balanced.
The collection piping must rise constantly towards the
heat pump in order to prevent air pockets. If this is not
possible, venting mechanisms must be installed at the high
points.
UTILITY
ROOM

16 Gebwell T² Installation, Operation and Maintenance Manual
Collector’s connection examples:
Connection T206 – T216
Connection T220 – T232
The line coming from the ground must be branched to the
expansion tank. The expansion tank must be directly
above the line coming upwards, so that air can rise directly
into the expansion tank. Do not make a connection to the
side branch or the air is prevented from rising freely.
Collector installation in multiple loops
When using multiple collectors, shut-off and balancing
valves must be included in all circuits. Observe the valve
manufacturer’s instructions when installing the balancing
valves. However, the valves must be installed so that
adjustment and inspection can be arranged easily and
freezing is prevented. Vent the circuits one at a time and
adjust the flow in proportion to each circuit lengths. Try
to use collection circuits of a roughly equal length.

v2-7 24052017 17
Pressurised collector
A collector can also be pressurised. In this arrangement,
the diaphragm expansion vessel, which is available as an
accessory, is used. If the level expansion vessel does not
fit the highest location of the circuit, a pressurised system
should be used.
7.2 Connecting ground cooling
Ground cooling works best when heat is collected by
means of a bored well. The temperature of a loop installed
in the ground or in a lake may rise high enough to prevent
the extraction of sufficient cooling capacity. The air in the
collector must be able to freely rise to the expansion
vessel. Venting must always be arranged at the highest
point of the collector. If there is a need to connect a
cooling radiator to the highest point of the collector, the
venting must be arranged through it.
A cooling accessory available for the heat pump can be
used to control/adjust the cooling. Building automation or
an air supply unit can also control the source pump inside
the heat pump. See instructions in the electrical
connection diagram.
Connection options
Direct connection to convection heater
Heat exchanger connection with cooling control
COOLING

18 Gebwell T² Installation, Operation and Maintenance Manual
7.3 Charging circuit
When viewing from the front, the heat pump’s charging
circuit is at the left side of the device. The charging circuit
has had shut-off valves installed at the factory in order to
facilitate maintenance work. See the charging circuit’s
connection in the connection options below or the site-
specific diagram.
• Install the required protective devices, mud separator
(strainer) as well as the shut-off and check valves.
• Residual installation impurities must be flushed from
the building’s heating system pipes before installing
the heat pump.
• It is recommended to perform the installation to a
closed heating system with a diaphragm expansion
vessel.
• Ensure that water does not spill on the pump or in the
electrical devices during operation.
• The product must be protected against overpressure
with a safety valve. The safety valve’s maximum
opening pressure must be 2.5 bar, and the valve must
be installed in the heating system’s return pipe. It is
recommended to lead the overflow pipe of the safety
valves to the nearest floor drain. Install the overflow
pipe so that the water can flow out of the pipe
without obstructions.
• A connection to a system equipped with thermostats
requires a bypass valve to be installed in all the
radiators or that a few thermostats be removed to
ensure sufficient flow. Refer to Technical
specifications table for pump’s minimum flow
• The heating system must have the device’s minimum
flow, refer to the Technical specifications table for
the minimum flow
Connection options:
1. Heating supply
2. Heating return
3. Brine in (from the ground)
4. Brine out (to the ground)
5. Cold water
6. Domestic hot water
7. Hot water circulation
Connecting a heat pump system to a HPe accumulator
Connecting a heat pump system to two G-Energy
accumulators
DHW EXCHANGER
FILLING

v2-7 24052017 19
7.4 Connections of an additional heat
source
Connection of an additional heat source to the
heating circuit
Use of an additional heat source requires the AVS
extension module sold as an accessory. An additional heat
source refers to a secondary heat source, which produces
additional heat / power in the ground source heat hybrid
system. The heat source can be, for example, an oil burner,
electrical boiler, district heating or natural gas. The heat
pump’s controller directly controls the additional source
with a 0-10V control message or relay control. If the
additional source is controlled with relay control (K27),
the adjustment must be made with a 0-10V control
message, either by using a circulating pump of control
valve. The B10 flow sensor is used as the additional heat
source’s control sensor. The control of an additional heat
source requires the introduction from the controller.
Additional heat source with the connection of
heating/domestic hot water
The additional heat source may be connected after the heat
pump, before the change-over valve. This allows the use
of the additional heat source for charging heating and
domestic hot water. The control of the additional heat
source can be implemented with an adjustable pump
control, adjustable additional heat source or a 3-way
mixing valve with 0-10V control.
7.5 Connections of a fixed fuel boiler
Boiler control
Boiler control refers to an uncontrolled heat source, such
as a wood boiler or water-circulated fireplace. The use of
wood boiler control requires the AVS module sold as an
accessory, as well as a accumulator sensor B4. Heat
distribution must be implemented with a control group in
order to control the temperature of supply water. In the
connection example below, the heat pump’s controller
measures the temperature of the accumulator and the
wood boiler, and controls the boiler’s charging pump Q10
in accordance to the temperature values set for the
controller.
7.6 Connecting the domestic water system
The domestic water system must be equipped with a safety
valve (max 10bar) installed in the cold water line as shown
in the figure. It is recommended to lead the overflow pipe
of the safety valves to the nearest floor drain. Install the
overflow pipe so that the water can flow out of the pipe
without obstructions.
The domestic water safety valve may leak nearly every
time higher consumption of warm domestic water ceases.
The overflow is caused by the thermal expansion of cold
water and pressure shocks. The safety valve leak can be
prevented by installing an expansion vessel in domestic
water network. The vessel evens out the pressure changes
and prevents pressure shocks.
Wood boiler connection, heating
A
dditional hea
t
source
connection
heating
Heating Heating
DHW DHW
ADH MD 1
HP
ADH
ADH
Heating DHW
DHW
Heating
WOOD
BOILER
GSHP
HP
HP

20 Gebwell T² Installation, Operation and Maintenance Manual
Accumulator tank for the domestic water system
If the consumption of domestic water is high, the heat
pump can be supplemented with an electrically heated
additional accumulator. The heat pump heats the cold
water in the internal accumulator, after which the water is
led to the external buffer accumulator. The electric
resistance of the external accumulator maintains the
temperature at the desired level. The system uses the
external accumulator to prepare for spikes in the
consumption of heat energy. If there are radiators in the
circulation of hot water, the connection must be confirmed
by an HV engineer.
7.7 Cascade connections
A cascade connection refers to the connection of several
heat pumps to the heating system. The heat pumps are
electronically connected to each other with a bus cable.
The device’s master device 1 is defined as the managing
device of the cascade, which controls switching the other
devices on and off according to the need of heat. The
plant’s master device operates as the producer of domestic
hot water. Up to 16 devices can be connected to one
cascade system.
Cascade with two heat pumps, Master device 1
operates at the producer of domestic hot water:
Cascade with three heat pumps, Master device 1
operates at the producer of domestic hot water:
1. Charge supply to domestic hot water accumulator
2. Charge return from the domestic hot water
accumulator
3. Heating supply
4. Heating return
5. Brine from ground to heat pump
6. Brine to ground from heat pump
** NOTE! The external source pump visible in the
cascade connections is inside the heat pump in T206
– T216 devices.
Master Device 2
Device 1
Master Device 2 Device 3
Device 1
CW HWC HW