Oilon RE 28 05 User manual

M8009 2147EN
25 October 2021
Installation and
operation manual
RE 28–48, RE 56–96

Contents
1 Introduction
1.1 Heat pumps covered in the manual........................................................... 3
1.2 Product description..................................................................................... 3
1.3 Instructions and diagrams...........................................................................4
1.4 Safety notice and warnings........................................................................ 4
1.5 Transportation and storage.........................................................................6
1.6 Scope of delivery........................................................................................ 7
1.7 Accessories................................................................................................. 8
2 Installation
2.1 Installation site.......................................................................................... 10
2.2 Dimensions, connections, and components............................................. 11
2.3 Modbus connection...................................................................................14
3 Installing temperature sensors
3.1 Outdoor temperature sensor.....................................................................15
3.2 DHW tank sensor......................................................................................15
3.3 Buffer tank sensor.....................................................................................16
3.4 Flow temperature sensor for heating circuit 1.......................................... 17
4 Commissioning
4.1 Configuring automation settings............................................................... 19
4.2 Starting the heat pump............................................................................. 19
4.3 Automation factory settings...................................................................... 20
4.4 Bleeding the system of air........................................................................22
5 Operation
5.1 Heat pump user interface......................................................................... 23
5.2 Commissioning menus..............................................................................25
5.3 Start page................................................................................................. 27
5.4 Heating circuit menu.................................................................................27
5.5 Heating curve............................................................................................28
5.6 Domestic hot water menu.........................................................................29
5.7 Changing the user level............................................................................30
5.8 Diagnostics menu......................................................................................31
5.9 Service menu............................................................................................ 31
5.10 Parameter list............................................................................................31
5.11 Resetting the heat pump.......................................................................... 32
5.12 Relay test.................................................................................................. 33
6 Cascade connection
6.1 Cascade connection..................................................................................36
M8009 2147EN 1 (74)

6.2 LPB bus configuration...............................................................................37
6.3 Shared brine circuit pump........................................................................ 39
6.4 Separate heat pump for DHW heating..................................................... 40
7 Technical data
7.1 Technical data...........................................................................................41
7.2 Compressor units......................................................................................45
7.3 Performance data......................................................................................46
7.4 EN 14285 Technical data sheets............................................................. 59
7.5 Operating conditions................................................................................. 63
7.6 Condenser circuit and evaporator pressure loss...................................... 65
7.7 Pumps....................................................................................................... 66
7.8 Temperature sensors................................................................................71
7.9 EU product data........................................................................................71
2 (74) M8009 2147EN

1 Introduction
1.1 Heat pumps covered in the manual
Model Item code Refrigerant
RE 28 05 RE2805 R-410A
RE 33 05 RE3305 R-410A
RE 38 05 RE3805 R-410A
RE 42 05 RE4205 R-410A
RE 48 05 RE4805 R-410A
RE 56 05 RE5605 R-410A
RE 66 05 RE6605 R-410A
RE 76 05 RE7605 R-410A
RE 84 05 RE8405 R-410A
RE 96 05 RE9605 R-410A
1.2 Product description
RE 05 heat pumps
RE 05 heat pumps come in two configurations: RE 28–48 heat pumps have a single
compressor unit, while RE 56–96 heat pumps have two compressor units. All RE heat
pumps include a control cabinet. The standard position of the control cabinet is on the
unit's left side, but it can be moved to the right side if needed.
RE 28–48 models
By default, the unit’s automation system has been configured for one domestic hot
water tank, one buffer tank for a heating circuit, and one heating circuit controlled by
a three-way valve. The automation system supports numerous other connections,
systems and accessories. Alternative system configurations are presented in separate
technical manuals for the automation system.
RE 56–96 models
The heat pump includes two compressor units, which can be used independently or
they can be joined together. The automation system has a separate controller and
separate electrical connections for each unit. If the units are used separately, they
operate independently of each other.
In standard two-unit deliveries, the units’ automation systems have been connected
for joint use (in a cascade configuration). In cascade systems, one of the heat pump
controllers operates as the master and controls the entire system, while the other, the
slave controller, operates under the master controller. The upper unit is the master unit
and the lower unit the slave unit.
M8009 2147EN 3 (74)

1.3 Instructions and diagrams
Document Designation
Installation and operation manual M8009
RE 05 28–33
Electric diagram
110415
RE 05 38–48
Electric diagram
110414
RE 05 56–66
Electric diagram
110412
RE 05 76–96
Electric diagram
110413
Quick guide 34793587
1.4 Safety notice and warnings
Read these instructions carefully before installation, commissioning, operation, or
maintenance of the device. The given instructions must be followed. Throughout this
manual, the following three symbols are used to point out very important information:
Be careful. The DANGER symbol indicates a possible danger of bodily
harm or lethal injury.
Pay attention. The CAUTION sign indicates a possible danger of
damage to the device, components or surroundings.
Note indicates tips, hints, and other essential information.
Keep these instructions as well as the electrical diagrams available near the device.
Installation, commissioning, or service of the appliance is to be carried
out by authorized and trained personnel only, adhering to all local
regulations and requirements.
Wear proper hearing protection and personal protective equipment,
such as protective footwear, gloves, and safety goggles when
necessary.
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Electrical safety
Once powered on, some of the unit’s components carry a hazardous
voltage. Always pay attention to electrical safety when working with or
near electrical components.
Before any maintenance or servicing, switch off electricity using the
main switch and ensure that there is no voltage present in the unit’s
components.
Refrigerant
Refrigerant leaking from an open or broken circuit may cause
asphyxiation, severe frost damage, arrhythmia, or neurological
symptoms. If you suspect a refrigerant leak, leave the area immediately,
and seek fresh air. Help and warn others.
Safety devices
Do not bypass, disable, or damage any of the unit’s pressure switches
or other safeguards with tools, by accessing the system’s software, or
by any other means.
Bypassing the unit’s safeguards may lead to equipment failure, damage to property or
injury to people.
Lifting and handling
The weight of the unit presents a crush hazard. Use safe work methods
when lifting and handling the unit.
During lifting, do not walk or work under the heat pump or any other
suspended load.
Other considerations
To avoid slipping, keep floor surfaces dry, and seal off or report any
leaks that you detect.
M8009 2147EN 5 (74)

1.5 Transportation and storage
Storage
Store the unit upright in a warm, dry place. Protect the device against water and dust.
Do not stack goods on the unit.
Transportation
Transport the unit upright and protected against water and dust. Do not stack goods
on the unit. Use only safe lifting and handling methods when moving or lifting the
unit. After lifting, lower the unit carefully down onto the floor. Hard impacts can cause
equipment damage.
Do not tilt the unit.
● If the unit is tilted beyond 45 degrees, the compressor may not receive proper
lubrication at startup. As a result, the compressor may become damaged.
● If the unit has been accidentally tilted beyond 45 degrees, leave the unit in vertical
position for at least three hours before starting the compressor.
Lifting
Lift and move the unit with a hand pallet truck or forklift.
● Lift and move the unit only so that both forks of the lifting device extend under the
whole unit.
● Keep the exterior panels of the compressor unit closed when lifting and moving the
heat pump.
● Do not lift the unit from under the control cabinet.
● Do not use the user interfaces as support points when lifting the unit.
Two-unit heat pumps:
Lift the tower consisting of two units only from below the lower unit.
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1.6 Scope of delivery
Equipment and components
Item PCS Designation
Outdoor temperature sensor 1 36217226
Outdoor temperature sensor ver. 1
Delivered with a solar screen panel.
NTC 1 k.
Condenser pump, RE 05 28–48 1 34023075 Wilo-Stratos PARA 25/1-12 T16180 mm 6h
Condenser pumps, RE 05 56–96 2 34023075 Wilo-Stratos PARA 25/1-12 T16180 mm 6h
Buffer tank temperature 1
DHW storage tank temperature 1
Heating circuit 1 flow temperature 1
 Connected to the heat pump’s control cabinet,
cable length approximately 4 m.
Sensors and actuators
Controller Piping
diagram
pos.
   
BRINE CIRCUIT 
B91 TE101 Brine circuit in (evaporator in) S
B92 TE102 Brine circuit out (evaporator out) S
Q8 P101 Brine pump (evaporator circuit pump) O
HEATING 
B71 TE201 Heating water return (condenser in) S
B21 TE202 Heating water flow (condenser out) S
Q9 P201 Heating pump (condenser circuit pump) S
K25/K26 EB203 In-line heater, condenser circuit -
B4 TE255 Buffer tank temperature (tank upper section)* S
B41 TE256 Buffer tank temperature (tank upper lower section) O
B3 TE265 DHW storage tank temperature (tank upper section)* S
B31 (B3) TE266 DHW storage tank temperature (tank lower section) O
Q8 FV202 Change-over valve O
B9 TE0 Outdoor temperature S
HEATING CIRCUIT 1 
B1 TE212 Heating circuit 1 flow temperature* S
Q2 P221 Heating circuit 1 pump O
Y1/Y2 FV222 Heating circuit 1 control valve O
B5/HMI1 TE213 Room temperature 1 O
HEATING CIRCUIT 2 
B12 TE222 Heating circuit 2 flow temperature OA
Q6 P221 Heating circuit 2 pump OA
Y5/Y6 FV222 Heating circuit 2 control valve OA
B52/HMI2 TE223 Room temperature 2 O
M8009 2147EN 7 (74)

Controller Piping
diagram
pos.
HEATING CIRCUIT 3 
B14 TE232 Heating circuit 3 flow temperature OA
Q20 P231 Heating circuit 3 pump OA
Y11/Y12 FV232 Heating circuit 3 control valve OA
B53/HMI3 TE233 Room temperature 3 O
REFRIGERANT CIRCUIT 
K1 COMP1 Compressor S
B81 TE2 Hot gas temperature S
E9 PS1 Low pressure switch S
E10 PS2 High pressure switch S
CONNECTION DEVICE 
OZW/
OCI672
  O
S: Standard equipment
O: Optional accessory, can be connected to the heat pump’s automation system and enabled without
additional equipment.
OA: Optional equipment that requires an auxiliary controller kit (controller + enclosure) for installation.
1.7 Accessories
For a full list of available accessories, please refer to brochures and price lists. Storage
tanks are presented in a separate storage tank brochure.
Accessories
Accessory Temperature sensor NTC10k 5 m
Designation 36217266
Description Sensor with flexible cable (length: 5 m), metallic probe (diameter: 6 mm, length: 50
mm), 1xNTC 10 kOhm, 2 wires, B(25/85)=3976, t0.97 s
Intended use Buffer tank temperature TE255
Heating circuit flow temperature TE212, TE222, TE232
Accessory Sensor pocket 6x200 G1/2
Designation 34021268
Description For 6 mm sensor probes, with cable gland, depth: 200 mm, G1/2" outer thread,
brass
Intended use Sensor pocket for buffer tanks and heating circuits
Compatible
equipment
36217266
Accessory Remote connection device
OCI670/109
Designation 36108276
Description Siemens OCI670/109. For remote connection through the Climatix IC cloud service.
Local connection through a USB cable. Connects to the heat pump controller
through an LPB bus (DB+/MB–) and to the internet through a network cable. You
can establish the connection with an internet browser, the Siemens ACS790
computer program or the Siemens Climatix IC mobile app.
8 (74) M8009 2147EN

Accessory Remote connection device
OZW672.01
OZW672.04
OZW672.16
Designation 36108094
36108107
36108268
Description Siemens OZW672. Remote connection for one, four, or 16 controllers. For remote
connection through the Climatix IC cloud service or a direct IP connection. Local
connection with a network cable or a USB cable. Connects to the heat pump
controller through an LPB bus (DB+/MB–) and to a LAN or the internet through
a network cable. You can establish the connection with an internet browser, the
Siemens ACS790 computer program or the Siemens Climatix IC mobile app.
Accessory Modbus module
OCI351.01/109
Designation 36108283
Description Siemens OCI351.01/109. Modbus RTU RS485.
M8009 2147EN 9 (74)

2 Installation
2.1 Installation site
Site planning and selection
● Install the unit and the associated equipment in a warm, dry place.
● The installation site’s ambient temperature must be within +5...+40 °C (non-
condensing).
● No condensate should accumulate onto the unit’s components from ambient air
(non-condensing atmosphere).
● The air at the installation site should be free of harmful quantities of dust or other
substances that may influence the heat pump’s performance, durability, or safety.
Unit base and leveling feet
Place the unit on a stable, steady base that can carry its entire weight. Mount the unit
securely in a vertical position onto its own leveling feet. Level the machine using the
machine’s leveling feet. The device must be adjusted horizontally using the leveling
feet of the device.
Maintenance and access clearance
Install shut-off valves that allow the unit’s evaporator and condenser to be isolated from
the rest of the system.
● Leave at least 30 cm of clearance behind the unit (on the evaporator and
condenser side).
● Leave at least 80 cm of clearance in front of the unit (on the user interface side).
● Leave at least 80 cm of clearance in front of the unit’s control cabinet door.
● There must be enough space for servicing at least in front of the unit.
Access clearance (RE) ver. 1
Pos. Item
HP Heat pump
FFront
BBack
Control cabinet
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Floor drain
The unit’s installation site must have a floor drain. The site’s floor should be inclined so
that any runoff from the unit leads towards the drain.
2.2 Dimensions, connections, and components
RE 28–48
RE, single compressor unit ver. 4
RE 05 28–48, single-unit configuration.
measurements in the image are in millimeters
Pos. Item
EC Switchboard
HMI User interface
S1 Operating switch, ON/OFF
AF Adjustable feet
(M10, DIN/ISO 17/16 mm)
BI Brine circuit in (evaporator circuit in)
ISO 228 G 2 (normal 2" outer thread)
BO Brine circuit out (evaporator circuit out)
ISO 228 G 2 (normal 2" outer thread)
WO Condenser circuit out, heating water flow
ISO 228 G 1 1/2 (normal 11/4" outer thread)
WI Condenser circuit in, heating water return
ISO 228 G 1 1/2 (normal 11/4" outer thread)
M8009 2147EN 11 (74)

RE 56–96
RE, two compressor units ver. 2
RE 05 56–96, two-unit configuration. 1: master unit, 2: slave unit.
Pos. Item
EC Control cabinet
HMI1 User interface
Upper unit (master)
HMI2 User interface
Lower unit (slave)
S1 Operating switch (ON/OFF)
Upper unit (master)
S2 Operating switch (ON/OFF)
Lower unit (slave)
AF Adjustable feet
M10, DIN/ISO 17/16 mm
BI Brine circuit in (evaporator circuit in)
ISO 228 G 2 (normal 2" outer thread)
BO Brine circuit out (evaporator circuit out)
ISO 228 G 2 (normal 2" outer thread)
WO Condenser circuit out, heating water flow
ISO 228 G 1 1/2 (normal 11/4" outer thread)
WI Condenser circuit in, heating water return
ISO 228 G 1 1/2 (normal 11/4" outer thread)
Transit bolts in compressor unit bottom plates
Each compressor plate has a transit bolt (screw) that supports the compressor during
transit. The screw goes through the compressor unit’s bottom plate, securing the
compressor’s base to the bottom plate. The transit bolt must be removed before
starting the unit.
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● Remove the transit bolt by unscrewing the screw from the bottom of the unit’s plate.
● The transit bolt has an M8 thread and a 13 mm hexagonal head.
Switches and fuses
RE 28–48
Marking Function Default
position
1S1 Operating switch ON/OFF ON
1FI Compressor motor protection ON
F3 Control fuse (automation system’s fuse) ON
1F4 Condenser circuit pump Q9’s fuse ON
1F5 Evaporator circuit pump Q8’s fuse ON
F6 Heating circuit 1 pump Q2’s fuse ON
F7 (Optional) Heating circuit 2 pump Q6’s fuse ON
RE 56–96
Marking Function Default
position
F3 Control fuse (automation system fuse) ON
S1 Operating switch ON/OFF
Upper unit (master) ON
S2 Operating switch ON/OFF
Lower unit (slave) ON
1F1 Compressor motor protection
Upper unit (master) ON
2F1 Compressor motor protection,
Lower unit (slave) ON
1F4 Condenser circuit pump Q9’s fuse
Upper unit (master) ON
1F5 Evaporator circuit pump Q8’s fuse
Upper unit (master) ON
2F4 Condenser circuit pump Q9’s fuse
Lower unit (slave) ON
2F5 Evaporator circuit pump Q8’s fuse
Lower unit (slave) ON
F6 Heating circuit 1 pump Q2’s fuse ON
F7 (optional) Heating circuit 2 pump Q6’s fuse ON
Operating switches
RE 26–48: operating switch S1; RE 56–96: operating switch S1 and S2
When the switch is in position 1/ON, the unit is in normal operating mode. When
the switch is in position 0/OFF, the compressor is prevented from starting, while the
heat pump’s automation system stays operational. The frost protection function is an
exception to this: it starts the in-line heater and the compressor’s condenser circuit
when the temperature falls below 5°C, even if the switch is set to 0/OFF.
If the condenser circuit’s temperature is below 5°C and you do not want the
compressor to start, set the compressor motor protection circuit breakers to the OFF
position.
M8009 2147EN 13 (74)

● RE 26–48: circuit breaker 1F1
● RE 56–96: circuit breakers 1F1 and 2F1
In RE 56–96 models, operating switch S1 halts the upper compressor unit (master),
and operating switch S2 halts the lower compressor unit (slave).
2.3 Modbus connection
Accessory Modbus module
OCI351.01/109
Designation 36108283
Description Siemens OCI351.01/109. Modbus RTU RS485.
The structure and operation of the previous version of the product (OCI350.01/101; 36108133) is nearly
identical.
Connect the RVS61.843 module to the controller’s connector X60. Use two-sided tape
to attach the module on top of the controller.
If the system includes several heat pumps, equip each controller with the Modbus
module. Activate the terminating resistor in the last module in the chain by setting each
of the module’s DIP switches to the top position.
● The terminating resistor is disabled, when both of the DIP switches are in the lower
position.
You can check that the controller has identified the module using the ACS program. In
the configuration menu, the line Modbus interface available will show yes, and the
Modbus menu will appear.
Modbus parameters
Configure the Modbus connection parameters presented below either using the user
interface or the ACS program.
Menu Line Setting
Modbus 6641 Modbus slave
address
Modbus 6652 Baud rate
Modbus 6653 Parity
Modbus 6654 Stop bit
The Modbus registers are available from our website and our customer services.
14 (74) M8009 2147EN

3 Installing temperature sensors
3.1 Outdoor temperature sensor
The heat pump’s outdoor temperature sensor (B9) is delivered with the heat pump. See
the necessary sensor connections in the unit’s electric diagram.
● In two-unit RE models, connect the sensor to controller A1.0 (master controller, in
the upper unit). If the system includes several heat pumps, connect the sensor to
the whole system’s master controller.
Connecting the sensor
Connect the sensor in terminal K in the heat pump’s Siemens RVS61.843 controller.
● Use a regular insulated copper twin cable for connecting the cable and extending
the cable.
● Select the cross-sectional area of the wires by consulting the table below.
● Join or splice the cable ends in a way that causes no additional electrical resistance
in the wires. Protect the joint against moisture and oxidation.
Cable length (m) 40 60 80 120
Wire cross-sectional area (mm2)0.50 0.75 1.0 1.5
Outdoor installation
Install the sensor outside the building with the sensor cable gland pointing downwards.
● Place the sensor in a position where the prevailing outdoor temperature can be
measured as accurately as possible.
● Make sure that the sensor is not exposed to solar radiation or heat from the
building.
Even though the sensor housing is protected against dust and water spray (IP65,
provided that the cable gland is pointed downwards), it is advisable to install the unit in
a location that is covered from rain. A good place for the sensor would be, for example,
under the eaves in a shady spot on the north wall of the building.
3.2 DHW tank sensor
The sensor cable is approximately 4.5 m long. The sensor probe’s diameter is 6 mm
and length 50 mm.
Install the sensor in the domestic hot water tank’s sensor pocket as specified in the
piping diagram.
M8009 2147EN 15 (74)

● If a dedicated tank is used, install the sensor in the lower section of the tank.
● If a combined storage tank is used, install the sensor in the upper section of the
tank.
● Install the sensor probe (supplied with the unit) into a sensor pocket designed for
6-mm probes. The sensor pocket needs to extend into the interior of the tank by at
least 150 mm.
Install the sensor in a way that allows it to measure the temperature of the fluid in the
storage tank as accurately as possible. The sensor pocket needs to extend far enough
into the interior of the tank, and the sensor pocket’s internal diameter must be suitable
for the sensor probe’s diameter.
● Use only metallic sensor pockets that won't corrode to any significant degree (from
the outside or the inside) over time.
● The air gap between the probe and the pocket wall should be as small as possible.
If necessary, use thermal paste between the sensor probe and the pocket walls.
● To ensure that the sensor probe remains firmly seated at the bottom of the sensor
pocket, secure the sensor cable with a cable gland.
The cable can be extended if required. Use a regular insulated copper twin cable for
connecting the cable and extending the cable (0.5mm2, length < 40m).
● Join or splice the cable ends in a way that causes no additional electrical resistance
in the wires.
● Protect the joint against moisture and oxidation.
If the heat pump will not be used for heating domestic hot water (and the sensor will not
be installed), disconnect the sensor’s wires from the heat pump’s control cabinet and
protect the bare wire ends. You can otherwise leave the sensor in place.
3.3 Buffer tank sensor
Installation
The heat pump comes with the buffer tank temperature sensor (B4) already connected.
Install the sensor in the buffer tank as specified in the piping diagram.
● If a dedicated tank is used, install the sensor in the upper section of the tank, below
the heating circuit outlets.
● If using a combined storage tank with separate sections for DHW heating and
space heating, install the sensor in the lower section of the tank.
● Install the sensor probe into a sensor pocket designed for 6-mm probes. The sensor
pocket needs to extend into the interior of the tank by at least 150 mm. The sensor
pocket is available as an accessory, see section Accessories.
Install the sensor in a way that allows it to measure the temperature of the fluid in the
storage tank as accurately as possible. The sensor pocket needs to extend far enough
into the interior of the tank, and the sensor pocket’s internal diameter must be suitable
for the sensor probe’s diameter.
● Use only metallic sensor pockets that won't corrode to any significant degree (from
the outside or the inside) over time.
● The air gap between the probe and the pocket wall should be as small as possible.
If necessary, use thermal paste between the sensor probe and the pocket walls.
● To ensure that the sensor probe remains firmly seated at the bottom of the sensor
pocket, secure the sensor cable with a cable gland.
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The sensor cable is approximately 4.5 m long. The sensor probe’s diameter is 6 mm
and length 50 mm.
The cable can be extended if required. Use a regular insulated copper twin cable for
connecting the cable and extending the cable (0.5mm2, length < 40m).
● Join or splice the cable ends in a way that causes no additional electrical resistance
in the wires.
● Protect the joint against moisture and oxidation.
If the heat pump will not be used for heating a buffer tank (and the sensor will not be
installed), disconnect the sensor’s wires from the heat pump’s control cabinet and
protect the bare wire ends. You can otherwise leave the sensor in place.
3.4 Flow temperature sensor for heating circuit 1
Installation
In single-unit RE heat pumps, the heating circuit 1 flow sensor (B1) is used to control
the circuit’s control valve (Y1/Y2). In two-unit configurations, the sensor is installed in a
the cascade’s shared flow line (sensor marking: B10; see the details at the end of this
section).
The sensor can be installed in the heating circuit’s flow line, even if there is no valve
to be controlled by the heat pump; this will allow the sensor’s reading to be viewed
through the automation system.
● If you do not install the sensor in the flow line, disconnect the sensor’s wires from
the heat pump’s switchboard and protect the bare wire ends.
● You can otherwise leave the sensor in place.
Install the sensor in the heating circuit flow line as indicated in the piping diagram.
Place the sensor in a way that allows it to measure the temperature in the flow line as
accurately as possible.
Install the sensor 0.5–2.0 m downstream from the control valve. Install the sensor
preferably downstream from the circulation pump. If the sensor is too close to the
valve, its readings will be inaccurate, and placing the sensor too far downstream will
cause harmful control delay.
Attach the sensor to a metallic pipe surface or in a metallic sensor pocket in the pipe.
Surface installation
● Attach the sensor firmly and securely against the pipe surface along the entire
length of the metal sleeve covering the sensor probe.
● Finish by adding thermal insulation to insulate the sensor from ambient air
temperature.
● If necessary, use thermal paste between the sensor probe and the pipe surface.
● It is advisable to attach the sensor along the pipe surface at the 3 o’clock or 9
o’clock position.
Installation in a sensor pocket
Iinstall the sensor in a pocket intended for 6 mm probes.
M8009 2147EN 17 (74)

If the pipe has a small diameter, create a 90 degree turn in the line flow direction with
a tee fitting. Place the sensor pocket in the outlet that is parallel to the original line. The
probe itself should extend upstream from the turn. This will allow you to install even a
long sensor pocket (150–200 mm) along the line. The sensor pocket is available as an
accessory, see section Accessories.
Tee fitting with sensor pocket ver. 1
Pos. Item
A Flow direction
B Tee fitting
C Sensor probe in pocket
D Sensor pocket connection
Using a tee connector to install a sensor pocket in a small-diameter pipe.
Sensor cable
The cable can be extended if required. Use a regular insulated copper twin cable for
connecting the cable and extending the cable (0.5mm2, length < 40m).
● Join or splice the cable ends in a way that causes no additional electrical resistance
in the wires.
● Protect the joint against moisture and oxidation.
Shared cascade flow sensor
By default, in two-unit RE models (and in multi-unit heat pump configurations), a single
shared flow temperature sensor (B10) is used to control the entire cascade. The heat
pump comes with the sensor already connected. Install the sensor to the condenser’s
flow line downstream from the last heat pump in the cascade. See the instructions
above.
An example of shared cascade flow sensor installation. M: Master, S1: Slave 1, S2: Slave 2 (Slave 2 not
present in standard two-unit RE configurations).
The shared cascade flow line and the heat pumps’ individual flow lines are shown in red.
18 (74) M8009 2147EN