Gebwell Qi Series User manual

WWW.GEBWELL.COM
Installation, Operation and
Maintenance Manual
Qi Ground Source Heat Pump

2 v3-8 23052017
Contents
1 WARRANTY ...................................................................................................................................................................................... 5
2 INSTALLATION RECORD ............................................................................................................................................................... 7
3 GROUND SOURCE HEAT AND COOLING .................................................................................................................................... 8
3.1 Ground source heat energy ...................................................................................................................................... 8
3.2 Ground source cooling ............................................................................................................................................ 8
3.3 Ground source heat pump’s operating principle...................................................................................................... 8
3.4 Heating functions .................................................................................................................................................... 9
3.5 Tips for saving ......................................................................................................................................................... 9
4 DELIVERY AND HANDLING ........................................................................................................................................................ 10
4.1 Safety instructions ................................................................................................................................................. 10
4.2 Delivery contents .................................................................................................................................................. 10
4.3 Optional accessories .............................................................................................................................................. 10
4.4 Storage .................................................................................................................................................................. 10
4.5 Transport ............................................................................................................................................................... 10
4.6 Removing the compressor unit .............................................................................................................................. 11
4.7 Hauling the compressor unit module ..................................................................................................................... 11
4.8 Removing the packaging ....................................................................................................................................... 12
4.9 Ground source heat pump’s location ..................................................................................................................... 12
5 DIMENSIONS AND PIPE CONNECTIONS ................................................................................................................................... 13
5.1 Pipe Connections ................................................................................................................................................... 13
5.2 Heat pump dimensions .......................................................................................................................................... 13
5.3 Heat pump components ......................................................................................................................................... 14
5.4 Heat pump sensors ................................................................................................................................................ 15
6 PIPE INSTALLATION ..................................................................................................................................................................... 16
6.1 Collector ................................................................................................................................................................ 16
6.2 Connecting ground cooling ................................................................................................................................... 18
6.3 Heat supply circuit ................................................................................................................................................ 19
6.4 Connecting the domestic water system ................................................................................................................. 21
7 ELECTRICAL CONNECTIONS ...................................................................................................................................................... 23
7.1 General .................................................................................................................................................................. 23
7.2 Power supply ......................................................................................................................................................... 23
7.3 Soft starter / phase sequence ................................................................................................................................. 23
7.4 Outdoor sensor ...................................................................................................................................................... 23
7.5 Room sensor (accessory) QAA55 ......................................................................................................................... 24
7.6 Room unit (accessory) QAA75 ............................................................................................................................. 24
7.7 External heating circulation pump / pump for heating circuit 2 (accessory) ......................................................... 24
7.8 Heating control group 2 (accessory) ..................................................................................................................... 24
7.9 Electric heater (SV1) power .................................................................................................................................. 24
7.10 Connection of the hot water circulation pump ...................................................................................................... 25
7.11 Alarm forwarding .................................................................................................................................................. 25

Gebwell Qi Installation, operation, and maintenance manual
3
7.12 External control of the source pump ..................................................................................................................... 25
7.13 Home / away switch .............................................................................................................................................. 25
7.14 Remote control / SmartWeb (accessory) ............................................................................................................... 25
7.15 Modbus 350 communication module .................................................................................................................... 25
8 FILLING ............................................................................................................................................................................................ 26
8.1 Filling the heating and domestic water circuits ..................................................................................................... 26
8.2 Filling the collector, non-pressurised .................................................................................................................... 26
8.3 Filling the collector, pressurised ........................................................................................................................... 26
8.4 Pressure test of the collector .................................................................................................................................. 27
9 GROUND SOURCE HEAT PUMP’S USER INTERFACE ............................................................................................................. 28
9.1 Operating elements ................................................................................................................................................ 28
9.2 Display symbols .................................................................................................................................................... 29
9.3 User levels ............................................................................................................................................................. 29
10 ACTIVATING THE GROUND SOURCE HEAT PUMP ................................................................................................................ 30
10.1 Before activation ................................................................................................................................................... 30
10.2 Activation .............................................................................................................................................................. 30
10.3 Operation without a collector and at a worksite .................................................................................................... 30
10.4 Venting .................................................................................................................................................................. 30
11 HEAT PUMP SETTINGS ................................................................................................................................................................. 32
11.1 Time and date ........................................................................................................................................................ 32
11.2 Language selection ................................................................................................................................................ 32
11.3 Time programme settings ...................................................................................................................................... 32
11.4 Domestic hot water settings .................................................................................................................................. 32
11.5 Settings for heating functions ................................................................................................................................ 33
11.6 Settings for the compressor functions ................................................................................................................... 35
11.7 Settings for the electric resistor (SV1) .................................................................................................................. 36
11.8 Electric resistor’s operating method (SV1) ........................................................................................................... 36
12 HEAT PUMP OPERATION ............................................................................................................................................................. 38
12.1 Navigating in the menu ......................................................................................................................................... 38
12.2 Symbols ................................................................................................................................................................. 38
12.3 Setting the heating ................................................................................................................................................. 38
12.4 Setting domestic water heating .............................................................................................................................. 39
12.5 Heating system tracking ........................................................................................................................................ 40
12.6 Special operations ................................................................................................................................................. 40
12.7 The heat pump's measurements ............................................................................................................................. 41
12.8 Vocabulary ............................................................................................................................................................ 42
12.9 Heat pump status information ............................................................................................................................... 42
12.10 Special situations ................................................................................................................................................... 42
12.11 Heat pump status ................................................................................................................................................... 42
12.12 Heating circuit status information ......................................................................................................................... 42

4 v3-8 23052017
12.13 Domestic hot water status information .................................................................................................................. 43
13 MAINTAINING AND SERVICING THE GSHP ............................................................................................................................. 44
13.1 Maintenance notice ............................................................................................................................................... 44
13.2 Inspections ............................................................................................................................................................ 44
13.3 Draining the hot water accumulator (LVV1) ........................................................................................................ 44
13.4 Draining the heating system .................................................................................................................................. 44
13.5 Draining the collector ............................................................................................................................................ 45
14 FAILURES ........................................................................................................................................................................................ 46
14.1 Alerts ..................................................................................................................................................................... 46
14.2 Troubleshooting .................................................................................................................................................... 46
14.3 Troubleshooting table ............................................................................................................................................ 48
15 TECHNICAL SPECIFICATIONS .................................................................................................................................................... 52
16 SET POINT EXAMPLES FOR HEAT PUMP ADJUSTMENTS IN DIFFERENT HEATING NETWORKS. ............................... 53
17 MAINTENANCE RECORD ............................................................................................................................................................. 54
18 ENERGY LABELS ........................................................................................................................................................................... 55
APPENDIX 1: ELECTRICAL DIAGRAM
APPENDIX 2: DECLARATION OF CONFORMITY
ALWAYS KEEP THE OPERATING MANUAL IN THE IMMEDIATEY 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 Protocol, one copy of which must be returned to the device
manufacturer. The protocol 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 compan
y
:
N
ame:
Date: Tel.:
Electrician:
N
ame:
Date: Tel.:

Gebwell Qi Installation, operation, and maintenance manual
5
1 WARRANTY
Gebwell Ltd.
Patruunapolku 5, 79100 LEPPÄVIRTA, tel [phone], [e-mail]
issues the product,
QI 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.

6 v3-8 23052017
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).
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:
• read the installation, operating and maintenance
manual carefully and think whether you have
used the device in accordance with the
instructions in the manuals
• 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
• all parts belonging to a device must be included
when the device is returned
• 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.

Gebwell Qi Installation, operation, and maintenance manual
7
2 INSTALLATION RECORD
The heating system must be inspected before commissioning following in-force regulations. Only qualified persons may
conduct the inspection. The installation record of the operating manual must be filled out before handing the device over to
the end user.
x Description Note: Inspected by: Date:
Collector:
S
y
stem pressure teste
d
S
y
stem flushe
d
S
y
stem vente
d
Collector liqui
d
Expansion vessel
Mud separato
r
Safet
y
valve
Shu
t
-off valve
x Description Note: Inspected by: Date:
Heating system:
S
y
stem pressure teste
d
S
y
stem flushe
d
S
y
stem vente
d
Safet
y
valve
Diaphra
g
m expansion vessel
Mud separato
r
Pressure
g
au
g
e
Shu
t
-off valve
Admission valve
Buffer accumulato
r
x Description Note: Inspected by: Date:
Domestic water:
S
y
stem pressure teste
d
S
y
stem flushe
d
Safet
y
valve
Pressure
g
au
g
e
Buffer accumulato
r
x Description Note: Inspected by: Date:
Electricity:
Propert
y
fuses
Heat pump fuses
Phase sequence
32A power socke
t
Outdoor temperature senso
r

8 v3-8 23052017
3 GROUND SOURCE HEAT
AND COOLING
A well-designed and appropriately dimensioned ground
source heating system is affordable in terms of operating
expenses and energy efficient. With a ground source 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.
3.1 Ground source heat energy
A ground source 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
3.2 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 ground source heat system can be connected to the
convection heaters of the ventilation system or a
underfloor heating/cooling system for cooling purposes.
3.3 Ground source heat pump’s operating
principle
The ground source 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.

Gebwell Qi Installation, operation, and maintenance manual
9
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.
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 evaporate. At this point,
the refrigerant absorbs heat from the liquid solution
circulating in the heat collection piping.
3.4 Heating functions
Domestic water
The heat pump produces domestic water based on the B3
measurement sensor. Compressor K1 is factory set to
activate when the measurement value drops under +45°C
and deactivated when the value reaches +50°C.
The “domestic water temperature 1” value, which is
shown in the control unit menu, is the temperature
measured by the domestic water operating sensor. The
actual temperature of the domestic water is 5°C–7°C
higher.
Heating
The heat pump produces heating water directly into the
building’s heating network. The control automation
activates the charging procedure when the measurement
value for supply water is 2.5°C lower than the supply
water set point. Charging is deactivated when the
measurement value is 2.5°C higher than 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
3.5 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. ...).

10 v3-8 23052017
4 DELIVERY AND
HANDLING
4.1 Safety instructions
The following safety instructions are to be taken into
account when handling, installing and using the
equipment.
• Do not lift the equipment from any other than the
points indicated on the manual.
• Remove the plug from the socket before carrying
out any maintenance measures.
• 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.
4.2 Delivery contents
• Ground source heat pump
• Installation, operating and maintenance manual
1 pc
• Outdoor temperature sensor 1 pc
• Safety valve for heating circuit
G1/2” – 2.5 bar 1 pc
• Safety valve for domestic water circuit
G1/2” – 10 bar 1 pc
• Supply cord with power plug 1 pc
4.3 Optional accessories
• Collector valve group
• Qi installation set (with or without pump)
• Qi R installation set
• Heating control group
• SMS/WEB server, SMARTWEB
• Cooling control group
• Cooling convector
• Buffer accumulator for domestic water
• Buffer accumulator for heating
• Circulation pump set for domestic water
• Pool heating set
• Diaphragm expansion vessel for collector
• Diaphragm expansion vessel for heating
• Energy measurement
4.4 Storage
Before installation, the ground source heat pump must be
kept in its delivery package in a dry and warm location.
4.5 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 (K1) 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.

Gebwell Qi Installation, operation, and maintenance manual
11
4.6 Removing the compressor unit
1. First, disconnect the front door of the ground
source heat pump by unscrewing the top screws.
2. Disconnect the pipes from the connections
(valves VS1…VS4). NOTE! If you have to
disconnect the unit, ensure that the collector
pipes are insulated when the unit is reinstalled in
order to avoid condensation.
3. Open the screws of the compressor unit supports
and disconnect the compressor unit plugs from
the switchboard and the compressor unit.
4. Pull the compressor unit out.
4.7 Hauling the compressor unit module
The compressor unit is equipped with loops for lifting.
Shafts can be used to lift up the compressor unit. By
threading the shafts through the loops, hauling the
compressor unit can be made easier.
The weight of the compressor unit:
Qi 6 96 kg
Qi 8 103 kg
Qi 10 104 kg
Qi 13 110 kg

12 v3-8 23052017
4.8 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.
• 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.
4.9 Ground source heat pump’s location
A variety of matters related to safety, comfort of use and
maintenance must be considered when positioning the
ground source 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 (K1) 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 ground source 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 ground source 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
ground source heat pump to prevent the transfer of any
vibrations. In addition, reserve at least 600 mm of free
space at the sides of the pump if you want to connect the
collector pipes to the pump’s sides instead of the top.

Gebwell Qi Installation, operation, and maintenance manual
13
5 DIMENSIONS AND PIPE
CONNECTIONS
5.1 Pipe Connections
A1. Brine from the ground ø28 mm
A2. Brine to the ground ø28 mm
B1. Heating supply
Qi6-10 ø22 mm, Qi 13 ø28 mm
B2. Heating return
Qi6-10 ø22 mm, Qi 13 ø28 mm
C1. Cold water ø22 mm
C2. Domestic hot water ø15 mm
C3. Hot water circulation ø15 mm
E1. Electrical connections (outdoor sensor, flow sensor,
actuators, etc.)
5.2 Heat pump dimensions

14 v3-8 23052017
5.3 Heat pump components
CHANGE-OVER VALVE
+ ACTUATOR (VV1)
SHUT-OFF VALVE (VS1)
SHUT-OFF VALVE (VS2)
SHUT-OFF VALVE (VS3)
SHUT-OFF VALVE (VS4)
INSIDE THE COMPRESSOR UNIT:
- HEAT SUPPLY PUMP (P2)
- SOURCE PUMP (P1)
- COMPRESSOR (K1)
- EXPANSION VALVE (PV1)
- EVAPORATOR (LS1)
- CONDENSER (LS2)
AIR VENT NIPPLE (VI1)
CIRCUIT
BREAKERS
(F2, F3, F4, F10)
MOTOR’S PROTECTIVE SWITCH (F1)
HOT WATER ACCUMULATOR (LVV1)
FLOW-THROUGH
RESISTOR (SV1)
SWITCHBOARD
OVERHEAT PROTECTOR
FOR FLOW-THROUGH
RESISTOR (SV2)

Gebwell Qi Installation, operation, and maintenance manual
15
5.4 Heat pump sensors
B3 Domestic hot water
B21 Charge heating water supply
B91 Brine from the ground
B92 Brine to the ground
B71 Charge heating water return
B21 B3
B71
B91
B92

16 v3-8 23052017
6 PIPE INSTALLATION
6.1 Collector
When 40x4.2 PN6.3 PEM hoses are used.
Device *Recommended
length of
collection piping
(m)
Recommended
active drilling
depth (m)
Qi6 300
–
400 110
–
130
Qi8 350
–
2x250 130
–
160
Qi10 400
–
2x300 160
–
200
Qi13 2x250
–
3x400 210 x 2x150
* Depends from soil
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.
Residual installation impurities must be flushed from the
collector before installing the heat pump.
The collector connection must be selected before
installing the device in place. The connection can be
changed to the right, left or back instead of the top. At
least 600 mm of connection space must be reserved in the
outgoing direction.
1. Disconnect the collector pipes from the
elbow fittings by pressing the plastic collar
of the claw coupling with a wrench.
2. Disconnect the pipe from the top connection
and turn the elbow fitting to the desired
direction.
3. Cut the pipe to the desired length, if
necessary.
• Insulate all of the building’s source/brine pipes
with closed-cell insulation in order to prevent
water condensation.
• Use supports insulated with rubber to support the
pipes.
• Place the level expansion vessel in the highest
point of the collector, in the incoming pipe before
the source pump.
• Mark the name of the heat collection liquid on
the level expansion vessel.
• Install shut-off valves in the pipe connections as
close as possible to the ground source heat pump.
• Ensure that water does not spill on the pump or
in the electrical devices during operation.
• Connect the supplied collector valve group,
including the expansion vessel, as shown in the
figure. The arrow on the valve housing indicates
flow direction. The valve group size is DN25. Do
not use a pipe size smaller than 28 mm for the
connections (bigger is recommended).
• The collector must be pressure tested at a
pressure of 3bar and the test pressure must be
maintained for at least 30 min.
• In the collector/brine, only use connection parts
that are intended for cold conditions.
UTILITY
ROOM

Gebwell Qi Installation, operation, and maintenance manual
17
Connection options
Connection from top
Connection from left
Connection from right
The incoming ground line must be branched to the
expansion vessel. The expansion vessel must be at the end
of the line rising directly upwards so that air can pass
directly into the expansion vessel. Do not make a
connection to the side branch or otherwise so that air
is not prevented from rising freely.

18 v3-8 23052017
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 the each circuit lengths.
Try to use collection circuits of a roughly equal length.
Pressurised collector (Recommended)
A collector can also be pressurised. In this arrangement,
the diaphragm expansion vessel, which is available as an
accessory, is used.
6.2 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 power. 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 (P1)
inside the heat pump. See instructions in the electrical
connection diagram.
Connection options
Direct connection to convection heater
Connecting mixing circuit for cooling with a heat
exchanger

Gebwell Qi Installation, operation, and maintenance manual
19
6.3 Heat supply circuit
The heating system controls the interior temperature with
a control adjuster and, for example, radiators, underfloor
heating, ventilation and convection heaters.
• Residual installation impurities must be flushed
from the building’s heating system pipes before
installing the heat pump.
• Install the required protective devices, mud
separator (strainer) as well as the shut-off and
check valves. Shut-off valves must be installed
as close as possible to 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
4.0bar, 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.
Connecting the heating system
Connection options
Accumulator tank to heating system
If the liquid volume of the heating system is too small in
proportion to the heat pump’s power, a buffer accumulator
can be used in the heating system.
NOTE! Ensure pump’s minimum flow with bypass valve
or by leaving sufficient amount of open circuits in heating
network. Refer to Technical specifications -table for pump
specific minimum flows.
Radiator/underfloor heating system with a buffer
accumulator
In radiator heating system, it is recommended to install a
buffer accumulator and extra circulation pump to avoid
the noise (clicking) in radiators. The accumulator and the
circulation pump prevent radiators from cooling down
during domestic hot water charging and the noise does not
arise.
If underfloor heating system requires an external
circulation pump, it should be dimensioned to meet the
needs of the underfloor heating system. If the liquid
volume of the heating system is too small in proportion to
the heat pump’s power, a buffer accumulator can be used
in the heating system.
OUTDOOR SENSOR
ON NORTH WALL
OUTDOOR SENSOR
ON NORTH WALL
Buffer reservoi
r
HEATING CIRCUIT 1

20 v3-8 23052017
Underfloor heating with an external heat supply pump
If heat pump’s internal heat supply pump is insufficient to
underfloor heating, an external heat supply pump is to be
installed. The pump has to be dimensioned to correspond
to demand of underfloor heating system.
NOTE! Ensure pump’s minimum flow with bypass valve
or by leaving sufficient amount of open circuits in heating
network. Refer to Technical specifications -table for pump
specific minimum flows.
Multiple heating systems with buffer accumulator
The following connection method is used when a building
features heating systems that utilise varying temperatures
– radiator heating and underfloor heating, for example.
Connecting an heating convector post-heating radiator
The ground source heat pump can be supplemented with
an accessory QiIV1, which enables connection of post-
heating radiator of water-circulating air convector. This
prevents post-heating radiator to freeze during domestic
hot water charge. Check the maximum flows and the post-
heating radiator’s power levels in the technical
specifications.
Mounting of installation set (with or without a pump)
Installation sets sold as accessory for heat pump ease and
speed up the installation. This guide to connecting applies
to both sets – with and without a pump.
OUTDOOR SENSOR
ON NORTH WALL
Underfloor Heating 1
Underfloor Heating 2
Radiator heating HC1
Buffer reservoir
Underfloor heating HC2
OUTDOOR SENSOR
ON NORTH WALL
OUTDOOR SENSOR
ON NORTH WALL
Buffer reservoir