Cetetherm Midi Wall IQHeat Manual

DOC-1560 Rev 2019-10-17
Installation, service and operating instruction Cetetherm Midi Wall IQHeat
Heating and domestic hot water substation for apartment houses (10-30 apts.)

This manual is published by Cetetherm.
Cetetherm can without further notice make changes and improvements to the content in this manual if it is necessary due to printing
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All these types of changes will be included in future release of the manual.
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Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
1
Contents
1General ..................................................................................................................................3
1.1 Comfort......................................................................................................................................................3
1.2 Installation .................................................................................................................................................3
1.3 Long-term security.....................................................................................................................................3
1.4 CE-marking................................................................................................................................................3
1.5 Information about the document................................................................................................................3
1.6 General warnings ......................................................................................................................................4
1.7 Product overview Midi Wall .......................................................................................................................5
2Operating instructions..........................................................................................................6
2.1 Operation...................................................................................................................................................6
2.2 Safety equipment/inspection.....................................................................................................................6
3Installation.............................................................................................................................7
3.1 Unpacking..................................................................................................................................................7
3.2 Preparation................................................................................................................................................7
3.3 Mounting....................................................................................................................................................7
3.4 Mounting the options.................................................................................................................................8
3.5 Adjustments and settings for start up........................................................................................................8
3.6 Dismantlement...........................................................................................................................................8
3.7 Commissioning advice ..............................................................................................................................8
3.8 Connection overview.................................................................................................................................9
3.9 Measure sketch Midi Wall IQHeat.......................................................................................................... 10
4Control center IQHeat.........................................................................................................11
4.1 Password and login................................................................................................................................ 12
4.1.1 Log in................................................................................................................................................. 13
4.2 Time functions setting of time and date ................................................................................................. 13
4.2.1 Reading date and time...................................................................................................................... 13
4.2.2 Setting date and time ........................................................................................................................ 13
5Troubleshooting..................................................................................................................14
5.1 Fault indication for IQHeat...................................................................................................................... 14
6Electrical installation..........................................................................................................15
6.1 General................................................................................................................................................... 15
6.2 Connection to internet ............................................................................................................................ 15
6.3 Installation of outdoor temperature sensor............................................................................................. 15
6.4 Electrical circuit diagram ........................................................................................................................ 16
7Schematic diagram, main components.............................................................................17
7.1 Option 3-point HB metering.................................................................................................................... 17
8Pump settings and capacity...............................................................................................18
8.1 General................................................................................................................................................... 18
8.2 DHWC pump Grundfos UPSO 15-55, capacity...................................................................................... 18
8.3 Heating circuit pump Grundfos UPMXL 25-125 180 Auto (GFJOC), settings and capacity.................. 19
8.3.1 Changing pump curve setting ........................................................................................................... 20
8.4 Heating circuit pump Grundfos Magna3 25-100, capacity..................................................................... 21
9Service instructions............................................................................................................22
9.1 Tap water, service instructions............................................................................................................... 22
9.1.1 Tap water too cold............................................................................................................................. 22
9.1.2 Tap water too warm........................................................................................................................... 22
9.1.3 Hot water temperature unstable........................................................................................................ 22
9.1.4 Nosie in the DHWC system............................................................................................................... 23
9.2 Heating system, service instruction........................................................................................................ 23
9.2.1 Heating system temperature too high or too low .............................................................................. 23
9.2.2 No heating......................................................................................................................................... 23
9.2.3 Noise in the radiator system.............................................................................................................. 24
9.2.4 Heating temperature unstable........................................................................................................... 24
9.2.5 Heating system often needs topping up............................................................................................ 24

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
2
10 Service actions for the installer.........................................................................................25
10.1 Check if the district heating strainer is blocked...................................................................................... 25
10.2 Check the function of the heating and hot water valve and actuator..................................................... 26
10.3 Check heating circuit strainer................................................................................................................. 27
10.4 Check DHWC pump............................................................................................................................... 27
10.5 Run the pump manually ......................................................................................................................... 28
10.6 Check the volume take-up and pressure equalizing of the expansion vessel ....................................... 28
11 Maintenance and repairs....................................................................................................29
11.1 Change the pumps................................................................................................................................. 29
11.2 Change the heating and hot water actuator........................................................................................... 30
11.3 Change the heating or hot water valve .................................................................................................. 30
11.4 Change the temperature sensor heating supply/return.......................................................................... 31
11.5 Change the outdoor temperature sensor ............................................................................................... 31
11.6 Change the expansion vessel................................................................................................................ 31
12 Options................................................................................................................................32
12.1 3-point HB metering ............................................................................................................................... 32
12.2 Mounting floor stand............................................................................................................................... 32
12.3 Balancing valve DHWC.......................................................................................................................... 33
13 Technical data and performance .......................................................................................35
13.1 Operation data Midi Wall 70................................................................................................................... 35
13.2 Operation data Midi Wall 100................................................................................................................. 36
13.3 Operation data Midi Wall 130................................................................................................................. 37
13.4 Technical data........................................................................................................................................ 37

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
3
1 General
Cetetherm Midi Wall is a complete, ready-to-install heating network substation for heating and hot water. It is
designed for buildings with a primary connection to a heating network. Cetetherm has years of experience in
heating network technology and has developed Midi Wall with well-planned pipe work and with all components
easily accessible for inspection and possible future servicing.
1.1 Comfort
Midi Wall has fully-automatic temperature control for heating and hot water. The heating is controlled in relation
to outdoor temperature and/or desired room temperature. The hot water is controlled and maintained at the
desired temperature.
1.2 Installation
Well planned pipe work and readymade electrical wiring make installation very simple. A pre-programmed
controller and plug-and-socket connection provide further simplification, so that the substation can be started
without delay. The Midi Wall is designed for hanging on the wall.
Before installation this manual must be read.
1.3 Long-term security
All components are adjusted together and undergo thorough function testing in accordance with ISO 9001:2008
quality assurance system. For future servicing requirements, all components are easily accessible and
individually replaceable.
1.4 CE-marking
Midi Wall is CE-marked to certify that the substation conforms to international safety regulations. To maintain
the validity of the CE marking, only identical replacement parts must be used.
1.5 Information about the document
All pictures in this document are general images.
Mid Wall is available in different models and levels of equipment.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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1.6 General warnings
The installation work must be carried out by an authorized installation contractor. Before the system
is taken into operation, it must be pressure tested in accordance with relevant regulations.
The temperature and the pressure of the district heating water are very high. Only qualified
technicians can work with the district heating substation. Incorrect operation may cause serious
personal injury and result in damage to the building.
If the hot water temperature is set too high, people may be scalded. If the hot water temperature is
set too low, unwanted bacteriological growth may occur in the hot water system. This can result in
serious personal injury.
Parts of the Midi Wall may get very hot and should not be touched.
Before the substation is connected to the electrical supply, make sure that the secondary heating
system is topped up with water. Starting up the system without water will damage the circulation
pump.
The substation comes prepared with an electrical plug to be connected to the main supply. The
strain relief clips of the cable must be fitted so that there is no risk of damage. If necessary, the
plug-and-socket connection can be replaced with a permanent installation with an all-pole isolate
switch. This must be carried out by a qualified electrician.
When starting up the district heating substation: to avoid the risk of scalding, make sure that no-one
draws any hot water until the hot water temperature has been adjusted.
Start district heating circulation by first opening the valve in the district heating supply and then
return lines, to avoid pollutions in the system. Open the valves slowly to avoid pressure surges. Do
the same way with the heating circuit, first open the valve for heating supply then return.
Do not shut of the electrical supply to the operator control panel. This will damage the circulation
pump, valves, actuators etc.
The heating station should be placed in a locked space, non-accessible for unauthorized personnel.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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1.7 Product overview Midi Wall
Picture 1
1.
Heat exchanger, heating
21.
Control centre
2.
Heat exchanger, DHW
22.
Actuator, DHW
3.
Control valve, heating
23.
Actuator, heating
4.
Control valve, DHW
24.
Temperature sensor, DHW
5.
Shutoff valve, cold water
25.
Temperature sensor, heating supply
6.
Check valve, cold water
26.
Temperature sensor, heating return
7.
Filling valve
27.
Temperature sensor, outdoor
8.
Hose
28.
Temperature sensor, district heating supply
9.
Safety valve, cold water
29.
Temperature sensor, district heating return
10.
Shutoff valve, DHWC
30.
Temperature sensor, primary heating return
11.
Pump, DHWC
31.
Temperature sensor, DHWC
12.
Non-return valve, DHWC
A.
Heating return
13.
Shutoff valve, DHW
B.
Heating supply
14.
Strainer, primary in
C.
District heating supply
15.
Dummy, heat meter
D.
DHW
16.
Shutoff valve, heating return
E.
CW
17.
Strainer, heating return
F.
DHWC
18.
Safety valve, heating
G.
District heating return
19.
Shutoff valve, heat supply
H.
Connection expansion vessel
20.
Pump, heating

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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2 Operating instructions
2.1 Operation
The temperature and pressure of the incoming heating network water from the culvert network are very high.
For this reason, only the heat from this water is used. The heating network water does not enter the heating
and hot water systems of the building.
The heat from the heating network water is transferred to the heating and hot water systems of the building in
the heat exchangers. The heat is transferred through thin plates of acid-resistant stainless steel which keep the
heating network water separate from the systems in the building.
Midi Wall has automatic temperature control for heating and hot water. The heating circuit is controlled in
relation to outdoor temperature and/or desired room temperature by means of a controller and temperature
sensor. When no heat is needed, the circulation pump in the heating circuit stops automatically, but is started
regularly to make sure that it does not seize up during long idle periods. The hot water temperature is controlled
by a temperature control system which is set to about 55 ºC.
After adjustment, the Midi Wall operates completely automatically. However, in hard water areas it is advisable
to be attentive and to remedy any faults in good time if the temperature of the hot water is too high; otherwise
the risk of lime deposits in the heat exchanger may increase.
2.2 Safety equipment/inspection
•Daily inspection to check for leaks from pipes or components.
•Weekly inspection to make sure that the operation of the heating and hot water control systems is
stable and that the temperature does not fluctuate. Temperature hunting causes unnecessary wear of
valves, actuators and heat exchangers.
•Every three months check the safety valves and the pressure in the heating system.
To check the operation of a safety valve, turn its wheel/knob until water escapes from the valve, then close the
wheel/knob quickly. Occasionally a safety valve may open automatically to release excess pressure. After a
safety valve has been open it is important that it closes properly and does not drip.
Hot water temperature in apartments or one family houses can be set to about 55°C. If the temperature is set
too high, there is a risk of scalding. Setting the hot water temperature too low may result in unwanted
bacteriological growth in the hot water system.
For setting and (if necessary) fine adjustment of the heating and hot water temperatures,
see User instruction IQHeat Doc-1552.
The heating system is topped up via the topping up valve. Be sure to close the valve when the correct pressure
is reached. The water used to top up the system contains oxygen and may cause corrosion in the system. For
this reason, the system should be topped up as seldom as possible, at most once
If a joining must be loosened and then re-installed, for example when installing the substation or when
replacing a filter unit, the joining gaskets should be exchanged to prevent leaks.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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3 Installation
3.1 Unpacking
•Remove the transport packaging and check that the product has not been damaged in transit and that
the consignment agrees with the specifications.
•When lifting the unit, take care not to apply stress to pipes and heat exchangers as this may weaken
them Lift the unit in the frame; avoid lifting the unit by holding the heat exchangers. Use pallet lift where
applicable, if using back straps these should be attached to the substructure of the substation.
NOTE: Risk of injury lifting heavy objects.
3.2 Preparation
•Choose a suitable installation area in accordance with official regulations.
The system may generate sounds during operation caused by pumps, regulators systems, flows etc.
This should be taken into consideration during installation of the unit, so that possible operational
sounds affect the surroundings as little as possible. This means that the system should be installed on
well-insulated walls, such as outer walls or on concrete walls.
•Check the applicable regulations of the district heating supplier. The available differential pressure
should be at least 100 kPa and at most 600 kPa. Where the differential pressure is higher, a differential
pressure controller should be added to the installation.
•Flush heating and hot water systems.
3.3 Mounting
•Mount the substation on a wall with screws and bolts suitable for mounting wall material and substation
weight. The distance between floor and screw bracket should be 1420 mm. Note that distance between
screws are 400 mm. Mount the floor support on the central, use the middle mounting hole. Raise the
central and mount it on the wall.
•Place the substation so that connections, adjustment equipment and safety valves are easily
accessible.
•Mount the shutoff valves on district heating supply and return. Shutoff valves are not supplied.
•Connect the pipe works to the connection points, see 3.8 Connection overview.
•When executing hot work on or close by the substation, all incendiary components should be
demounted and removed.
•With supply temperatures above 100°, it is recommended that the actuator is tilted or closed down, see
Picture 2.
•Take rules and instructions regarding hot work into account.
•Connecting pipes shall be suspended so that their weight does not stress the unit.
•All connecting pipes within and connecting to the units’system shall be insulated according to
standards and regulations.
•Drainage pipes from safety valves must be taken to floor gully.
•Energy meters must be installed at a prepared location, replacing a gauge block, or following the
instructions of the energy supplier.
NOTE: the connection pipe between the valves is just for draining.
•Retighten all connections, including those made at the factory. If connections need retightening after
the installation has been taken into service, the system should be depressurised before retightening. If
the system is not depressurised before retightening, gaskets will be damaged.
•Required expansion volume shall be installed and provided with adequate pre-charge before start up.
•Remount plugs in drain valves after possible draining of circuit.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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•Mount the outdoor temperature sensor on the north side of the building, 2 metres above the ground, or
higher. For installation of the outdoor temperature sensor, see 6.3 Installation of outdoor temperature
sensor.
Picture 2
3.4 Mounting the options
•If the substation shall be provided with a 3-point HB metering, see mounting instructions
12.1 3-point HB metering.
•If the substation shall be provided with a floor stand, see mounting instructions
12.2 Mounting floor stand.
3.5 Adjustments and settings for start up
•Open incoming cold water supply and fill the service water and heating circuits, bleeding off any
trapped air.
•Check the operation and opening pressures of the safety valves.
•Adjust the hot water temperature by having a hot water tap open at normal flow rate for a time.
Measure the temperature at the draw-off point with a thermometer. The temperature should be
approximately 55°C. It takes about 20 seconds to get stable tap water temperature. See
troubleshooting chart for adjusting hot water temperature.
NOTE: Make sure that no cold water is mixed with hot water while making this adjustment.
•Start the heating circulation pump at the strongest flow setting during some minutes. The pressure
should be at least 100 kPa during winter and at least 60 kPa during summer.
•Set the pump capacity of the heating circulation pump according to chapter 8, Pump settings and
capacity. Use the lowest setting that manages the heating demand for best electrical efficiency
Make any necessary adjustment of the heating curve of the control and regulating equipment.
Information about the controller can be found in this document.
•Set time, date and hot water temperature on the adjustment center.
•The property owner must be informed on how to operate, adjust and maintain the unit. It is overly
important to inform about the safety systems and the risks associated with the high pressure and
temperature of the district heating systems water supply.
3.6 Dismantlement
When the time comes for the substation to be dismantled and scrapped it must be disposed of in the correct
manner in accordance with local or national regulations.
3.7 Commissioning advice
The controller has been set at the factory. If any function needs tuning, values can be changed with reference
to this manual for parameter setting. Initially, the commissioning process should be carried out with the factory
settings. The parameter settings need tuning only if the district heat terminal does not function accordingly.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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3.8 Connection overview
Picture 3
1
Heat Supply G1 1/4"
5
DHW G1”
2
Heat Return G1 1/4”
6
DH Supply DN25, weld
3
CW G1”
7
DH Return DN255, weld
4
VVC G1”

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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3.9 Measure sketch Midi Wall IQHeat
Picture 4

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
11
4 Control center IQHeat
IQHeat is an intelligent controller for district heating and cooling substations.
Whether it is energy saving, energy cost reduction or comfort monitoring that is the goal, IQHeat from
Cetetherm is an excellent choice.
IQHeat is fitted with a display.
IQHeat has always a temperature sensor on the primary side supply and return, and on the secondary side
supply and return. The sensors allow for the effective limitation of return temperatures and simple monitoring
and remote troubleshooting of functional or comfort problems.
IQHeat is always factory tested and factory set.
Midi Wall can be equipped with different IQHeat models:
•IQHeat50: serves one heating circuit
•IQHeat100: serves one heating circuit and one hot water circuit
Communication with the processing unit takes place with ModBus or TCP/IP.
Different methods of communication are available, depending on the external communication modules that are
connected.
The following add-on modules are available as options and can be connected to a Midi Wall:
•MBus
•BacNet IP
•Advanced Web
Add-on modules give you the option of
•meter data via MBus
•Integrated WEB server where all data and history from IQHeat is available through a simple web
browser without requiring any special software or server connections
•BacNet and LON as well as ModBus give you the option of controlling IQHeat from the central building
automation system.
For more information about the IQHeat please see User instruction IQHeat Doc-1552.
This manual describes all the services, functions and settings that can be made with the processing unit, which
is common to all models of IQHeat.
Not all the services, functions and settings are utilised by the different models.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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4.1 Password and login
The controller has password protection, allowing access to different menus.
The following log-in levels are available:
All users: no log-in, no password required
•read access to all menus except the system parameters, configuration and detail menus
•read access to alarm lists and alarm history
End user, level 6, password 1000
•appears with one key in the upper left corner of the display
•all rights as for in "all users"
•read access to all menus except configuration menus
•write access to the main set points (Setpoints/Settings. > Setpoints)
•alarms and alarm history can be acknowledged and reset
Service level, level 4, password 2000
Used for configuring I/Os and system settings. Only qualified service personnel should make changes at this
level.
•appears with two keys in the upper left corner of the display
•all rights as for "End users"
•access to all menus except I/O configuration and system settings
OEM, level 2
•appears with three keys in the upper left corner of the display
•all rights as for System Administrator
•access to all menus and system settings.
Contact Cetetherm if there is a need to change anything at this level.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
13
4.1.1 Log in
1. Keep the OK button pressed to access the
Password menu.
2. The first digit of four is marked with 0.
3. Turn the navigation dial until the desired number
appears.
4. Press OK to proceed to the next digit, continue
until all four are entered correctly and press OK.
The current key symbol will appear in the upper left
corner of the display window.
4.2 Time functions setting of time and date
The controller's clock includes the functions for summer and winter time changes and leap years. The clock has
a backup function to cover at least 24 hours of power cuts.
4.2.1 Reading date and time
1. Press Info to access Main overview.
2. The top line shows the set date and time.
4.2.2 Setting date and time
Requires login at end user level.
1. Press Info until the page with the date and time are displayed.
2. Move the cursor to the line for date and time.
3. Press OK to edit the day.
4. Set the correct day with the navigation dial, press OK to confirm and continue to edit the month and
year.
5. Continue to edit the hours, minutes and seconds in the same way.
6. Exit the menu with ESC.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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5 Troubleshooting
5.1 Fault indication for IQHeat
The processing unit alerts for different situations. Alarms are indicated on the control display with the alarm
symbol .
Alarms are divided into three classes:
•A or 1 = Alarm, High
•B or 2 = Alarm, Low
•C or 3 = Alarm, Warning
Active alarms:
•alarm symbol in the display flashes
•alarm button on the control panel flashes
Acknowledged but still active alarm:
•alarm symbol in the display lights
•alarm button on the control panel lights
If a GSM modem is connected to the processing unit, an alarm is sent by text message to the specified
telephone number.
For more information please see User instruction IQHeat Doc-1552.

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
15
6 Electrical installation
6.1 General
The wiring in Midi Wall conforms to the applicable rules for CE marking and has undergone electrical safety
testing and function testing. For permanent installation must the substation be connected to an all-pole isolator
switch. This must be done by a duly qualified electrician.
The substation must be connected to a grounded power outlet.
6.2 Connection to internet
For connection to internet the control panel has a cable with RJ45-contact.
6.3 Installation of outdoor temperature sensor
Connect the outdoor temperature sensor to a terminal strip in accordance with the
electrical diagram, if there is a resistor, remove it.
The resistor simulates an outdoor temperature of 0°C.
If using a cable with two conductor area of 0.75mm2the maximum cable length is
80 meters.
Picture 5

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
16
6.4 Electrical circuit diagram
Picture 6

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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7 Schematic diagram, main components
Picture 7
7.1 Option 3-point HB metering
Picture 8
1.
Welded filter
2.
Shut off valves
3.
Manometer clock
4.
Sensor pocket energy meter primary in
5.
Sensor pocket energy meter primary out
6.
Flanged dummy 260mm energy meter

Cetetherm Midi Wall IQHeat
Installation, service and operating instruction
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8 Pump settings and capacity
8.1 General
Mini Wall is equipped with two circulation pumps, one for the hot water circulation, DHWC-pump, and one for
the heating circuit.
The DHWC pump is a traditional three speed circulation pump. The DHWC pump has a switch where the
speed/capacity can be set.
The heating circuit can be equipped with two different circulation pumps, both pumps are pressure controlled.
8.2 DHWC pump Grundfos UPSO 15-55, capacity
Picture 9
Picture 10