COMPACT CONTROLLER CMT.EC
OPERATION MANUAL
CMT.EC compact controller
2FläktGroup DC-2020-1060-GB 2021-06/R1 • Subject to change
1 Safety and User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Availability of the operation manual . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Scope of application of the operation manual . . . . . . . . . . . . . . . . . . . 4
1.3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Labelling of safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Used safety symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Safety-conscious work procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.8 Modifications and changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.9 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.10 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.11 Personnel selection and qualification . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Technical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Packaged content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Use of the FläktGroup CMT.EC Compact Controller . . . . . . . . . . . . . 9
2.3 Equipment characteristics of the FläktGroup CMT.EC Compact
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Technical data and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Assembly and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Planning of mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Mounting the FläktGroup CMT.EC compact controller . . . . . . . . . . . 14
3.3 Installation of the FläktGroup CMT.EC compact controller . . . . . . . . 15
3.4 Functions of the FläktGroup CMT.EC compact controller . . . . . . . . . 16
3.5 Dismounting the FläktGroup CMT.EC compact controller . . . . . . . . 21
4 Commissioning and testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Factory settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2 Configuration of the FläktGroup CMT.EC compact controller . . . . . . 22
5 FläktGroup CMT.EC compact controller operation . . . . . . . . . . . . . . . . 25
5.1 Overview of the operating elements . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 Explanation of the control elements . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3 Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6 Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Hole distance for the FläktGroup CMT.EC Compact Controller . . . . . . 27
Copyright note
Disclosing, copying, distributing or taking any action in reliance on the contents of this document is strictly prohibited
without express prior consent. Violations entail liability for any damages or other liability arising. All rights in relation to
patents, utility patents or design patents are reserved.
CMT.EC Compact Controller
FläktGroup DC-2020-1060-GB 2021-06/R1 • Subject to change 3
FläktGroup product range - here an example with a CMT.EC compact controller
Safety and User Information CMT.EC Compact Controller
4FläktGroup DC-2020-1060-GB 2021-06/R1 • Subject to change
1 Safety and User Information
The FläktGroup CMT.EC compact controller is designed according to the state of tech-
nology and the recognized safety regulations.
Use the FläktGroup CMT.EC as intended by the manufacturer and only when it is in
perfect working order. Observe the operation manual and be aware of the dangers and
safety precautions, otherwise there may be risk of death or injury to the user or third
persons. Adverse affects to the CMT.EC compact controller itself, connected units or
other equipment may also occur!
Have all faults repaired by an authorized specialist without delay!
All information in this chapter is important and relevant for your safety. However, not
all of the information contained in the present manual is labeled with special danger
pictograms.
1.1 Availability of the operation manual
This operation manual contains important instructions regarding safe and correct oper-
ation of the FläktGroup CMT.EC compact controller.
The current operation manual is intended to be used by operators, building services
engineers, technical personnel or instructed staff as well as electrical specialists.
This operation manual must be available at the location of the FläktGroup CMT.EC
compact controller at all times.
Anyone who works with or on the FläktGroup CMT.EC compact controller must read
and observe this operation manual.
1.2 Scope of application of the operation manual
This operation manual provides information about the following:
– Assembly/disassembly
– Installation
– Commissioning and testing
– Operation
– Maintenance and troubleshooting
1.3 Symbols used
The following symbols are used to highlight particular text sections in this operation
manual:
– This symbol is used for normal lists.
•This symbol indicates instructions to follow.
This symbol indicates the result of an action.
NOTICE!
Additional details on using the unit are specified here.
CMT.EC Compact Controller Safety and User Information
FläktGroup DC-2020-1060-GB 2021-06/R1 • Subject to change 5
1.4 Labelling of safety information
The following designations/symbols are used in this manual to specify safety-relevant
information:
1.4.1 DANGER - Death/serious irreversible injury
Indicates an extremely hazardous situation which will result in death or serious irre-
versible injury, if the safety instruction is not followed.
Example:
1.4.2 ATTENTION – Environmental or material damage
Indicates actions that can result in damage to equipment or property.
Examples:
Electrocution through hazardous voltage will lead to death or serious injury!
•Disconnect the unit from the power supply and ensure the power cannot be
switched back on.
•Ensure the unit is voltage-free and isolated, earth and short circuit the unit, cover
or shield off neighbouring live components.
ATTENTION
ATTENTION
Environmental damage!
Heavily contaminated filters can have a negative impact on production processes.
Depending on the filtered-out materials, contaminated filters are therefore classi-
fied as hazardous waste and must be properly disposed of according to the pre-
vailing guidelines and laws.
ATTENTION
Device damage – damage through static discharge!
This symbol precedes a warning on static-discharge damage to the unit.
Safety and User Information CMT.EC Compact Controller
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1.5 Used safety symbols
1.6 Safety-conscious work procedures
When working on 230 V / 50 Hz power supplies:
•Observe all assembly instructions for the FläktGroup CMT.EC compact controller.
•Fluctuations or deviations of the line voltage may not exceed the tolerance limits
stated in the technical data, otherwise functional failures and excess conditions
cannot be excluded.
Electrical hazard
PERSONAL injury
Environmental damage
Damage to the unit
Damage through static discharge!
Electrocution through hazardous voltage will lead to death or serious injury!
•Disconnect the unit from the power supply and ensure the power cannot be
switched back on.
•Ensure the unit is voltage-free and isolated, earth and short circuit the unit, cover
or shield off neighbouring live components.
ATTENTION
Risk of damage due to electrostatic discharge!
While carrying out adjustment work on the FläktGroup CMT.EC compact control-
ler, make sure that you discharge yourself statically before touching the circuit
board and electrical components.
CMT.EC Compact Controller Safety and User Information
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1.7 Proper use
The FläktGroup CMT.EC compact controller exclusively serves as the control console
or as a controller for the fan coil units from FläktGroup.
The FläktGroup CMT.EC compact controller can be employed:
– to assign setpoints for room temperature
– to select fan speed
– for the control of:
– an EC motor 3-speed (0-10V)
– a 2-point valve body 2-pipe heater*
– a 2-point valve body 2-pipe cooling
– a 2-point valve body 2-pipe change over, heating or cooling
– a 2-point valve body 4-pipe heating and cooling
– for processing:
– External window contact or fault signal
– External clock timer, card reader or presence detector
– External switch-over with a sensor (NTC) or digital input of heating/cooling medi-
um
– External room temperature sensor (NTC)
The FläktGroup CMT.EC compact controllers meet the IP30 protection class which
protects the unit against outside influences:
Protection IP30
residential area
In protection type IP30 according to DIN EN 60529 for residential areas. May only be
used indoors; in this case ensure that the unit is protected against dust and other sub-
stances.
Improper use And use other than that described above is considered improper. The manufacturer/
supplier is not liable for any damages arising from improper use. The user alone is lia-
ble.
1.8 Modifications and changes
You are not allowed to change, add, or modify the FläktGroup CMT.EC compact con-
troller in any way.
Changes or modifications to the FläktGroup CMT.EC compact controller will invalidate
the CE conformity and render all warranty claims null and void.
(*) NOTICE!
In case of a 2 Pipe system used for heating only the changeover contact (10) need
to be bridged with common (11). Otherwise, the controller is in only cooling (sum-
mer) mode, see fig. 3-1 on page 15.
In case of an external room temperature sensor (NTC) the Jumper located at the
top right of the controller must be removed.
RISK OF PERSONAL INJURY!
The FläktGroup CMT.EC compact controller may not be operated:
– in areas subject to explosion risk
– in rooms with conductive dusts
– in rooms with strong electromagnetic fields
– in rooms with an aggressive atmosphere that attacks plastics, for instance
The FläktGroup CMT.EC compact controller should not be operated with protec-
tion class IP30:
– in humid rooms
– in rooms with dust-laden air
Safety and User Information CMT.EC Compact Controller
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1.9 Spare parts
You may use only original FläktGroup Air Technology spare parts, since FläktGroup
Air Technology is not liable if any third-party spare components are used.
1.10 Disposal
Main and operating supply materials must be disposed of according to material type in
a safe and environmentally friendly manner. In accordance with WEEE guidance.
1.11 Personnel selection and qualification
Ensure that every person working on the FläktGroup CMT.EC compact controller has
read and understood the entire operation manual, especially the chapter on safety. It
is too late to do this after the work has already begun.
Electrical connections may only be carried out by qualified licensed staff or other indi-
viduals with proper professional training and experience in the following areas:
– Occupational health and safety regulations
– Accident prevention regulations
– Directives and recognized codes of practice
All skilled staff must be able to assess the entrusted work and must be able to recog-
nize and avoid all associated dangers.
CMT.EC Compact Controller Technical description
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2 Technical description
2.1 Packaged content
FläktGroup CMT.EC: –Compact controller for assembly on a flush-mounted socket (protection class
IP30) consisting of top and mounting plate
–Supplementary sheet – for connection and operation overview of the controller.
Optional: –Sensor – room-temperature sensor type 903.414, R= 10 kOhm/25 °C
–Sensor – attached sensor for the water inlet temperature type 903.434,
R= 10 kOhm/25 °C
2.2 Use of the FläktGroup CMT.EC Compact Controller
The FläktGroup CMT.EC enables the control of fan-coil units for room-climate control.
The features are summarized as follows:
The assignment of...
– setpoints such as room air temperature
– fan operating modes such as stage 1
The activation of...
– EC motor 3-speed (0-10V)
– 2-point valve body 2-pipe heater*
– 2-point valve body 2-pipe cooling
– 2-point valve body 2-pipe Change Over, heating or cooling
– 2-point valve body 4-pipe heating and cooling
Processing of...
– External window contact or fault signal
– External clock timer or card reader
– External switch-over with a sensor (NTC) or digital input of heating/cooling medium
– External room temperature sensor (NTC)
(*) NOTICE!
In case of a 2 Pipe system used for heating only the changeover contact (10) need
to be bridged with common (11). Otherwise, the controller is in only cooling (sum-
mer) mode, see fig. 3-1 on page 15.
In case of an external room temperature sensor (NTC) the Jumper located at the
top right of the controller must be removed.
Technical description CMT.EC Compact Controller
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2.3 Equipment characteristics of the FläktGroup CMT.EC compact controller
Type Equipment features
Setpoint
assignment Connection to the unit Other
Setting of the fan speed
Setting of the room
temperature
EC ventilator (0-10V,
3-speed)
Heating valve (2-point)
Cooling valve (2-point)
Valve heating or cooling
Change Over (2-Point)
Input for window, fault
contact or presence
detector
Input clock timer or card
reader
Input for the switch-over of
heating/cooling medium
Input for the room
temperature sensor
Input of the inlet-
temperature sensor
Integrated room
temperature sensor
Automatic valve and fan
controller
CMT.EC
CMT.EC Compact Controller Technical description
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2.4 Technical data and accessories
Type series CMT.EC
Area of application Comfort area
Ambient atmosphere
Permissible ambient temperature 0 °C to 45 °C
Permissible ambient relative humidity <80 % r.h
Permissible storage temperature -10 °C to 50 °C
Permissible storage relative humidity <95 % r.h
Electromagnetic compatibility
Electromagnetic emission EN 61000-6-3 2011-09
Electromagnetic immunity EN 61000-6-2 2011-06
Mechanical data
External dimensions (W/H/D) 84 x 114 x 30 mm
Mounting on the wall
Weight 165 grams
Casing material Bayblend© FR3010
Casing front panel Similar to RAL 9016 (white)
Lower part of casing Similar to RAL 9016 (white)
Protection type (according to DIN 40050) IP30
Application position installed vertically
Cable entry point from behind
Electrical data
Supply voltage 230 V AC 50/60 Hz
Fan outputs (digital) -
Fan output (analogue) 0 - 10 V max. 1 mA
Valve outputs (digital) 230 V AC, 50/60 Hz max. 0.4 A (on/off or PWM)
Comfort/economy input (digital)
(Clock timer or card reader)
3.3 VDC
Release input (digital)
(Window or fault contact)
3.3 VDC
Change-over contact heating/cooling
(digital)
3.3 VDC
External room temperature sensor input
(analogue)
NTC sensor,10 KΩ at 25 °C, Beta 3435.
External input inlet-temperature sensor
(analogue)
NTC sensor,10 KΩ at 25 °C, Beta 3435.
Room temperature sensor Integrated
Options
External room temperature sensor Type 903.414
External inlet-temperature sensor Type 903.434
Technical description CMT.EC Compact Controller
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2.4.1 Technical data and accessories
Optional accessories Sensor type 903.414
Mechanical data
External dimensions (W/H/D) 84 x 84 x 22 mm
Allowed ambient temperature -35 °C to 70 °C
Mounting on the wall
Weight 40 grams
Casing colour RAL 9010 (pure white)
Application position vertical
Protection type (according to
DIN 40050)
IP20
Cable entry point Cable inlet from behind, for flush-mounted box
Electrical data
Resistance 10 KΩ/25 °C
Voltage Max. 12 V
Optional accessories Sensor Type 903.434
Mechanical data
External dimensions of bulb 6 x 35 mm
Maximum ambient temperature 100 °C
Mounting on pipework
Weight 40 g
Casing colour RAL 9010 (pure white)
Application position arbitrary
Protection type (according to
DIN 40050)
IP43
Cable length 2 m
Electrical data
Resistance 10 KΩ/25 °C
Voltage Max. 12 V
CMT.EC Compact Controller Assembly and Installation
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3 Assembly and Installation
3.1 Planning of mounting
Assembly of the
FläktGroup
CMT.EC compact controller/
room temperature sensor
* recommended
installation height = 1.5 m
Electrocution through hazardous voltage will lead to death or serious injury.
The electrical installation and (dis)assembly of the FläktGroup CMT.EC compact
controller may only be carried out by qualified electricians in compliance with this
operation manual and current VDE regulations.
Before drilling, ensure that the drilling area is free from electrical cables and pipes.
•Mount the FläktGroup CMT.EC compact controller only in closed rooms.
NOTICE!
The installation site of the CMT.EC compact controller or the room temperature
sensor is crucial for the precise control of room temperature.
Therefore, do not mount the CMT.EC compact controller or the sensor
– next to doors, windows or passageways, since intensive air movement can fal-
sify the measured value
– on hot or cold walls (e.g. chimney, outside wall), since the wall temperature can
cause incorrect measurements,
– placed behind blinds and net curtains, as the insulating layers of air can cause
incorrect measurements.
– be fitted adjacent to unit discharge grilles, as discharge temperature can cause
incorrect measurements
– be fitted below cold surfaces like windows, since descending cold air flow can
cause incorrect measurements.
*
NOTICE!
If a FläktGroup fan-coil unit has a heating or cooling change-over function, the
mounting location of the inlet-water temperature sensor is of decisive signifi-
cance for the accuracy of the automatic switch-over.
•Therefore, mount this flow sensor on the piping in a position where the current
water temperature can be best recorded. Pay attention that this sensor is not
assembled at a position where the water flow can be blocked by e.g. a valve.
Assembly and Installation CMT.EC Compact Controller
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3.2 Mounting the FläktGroup CMT.EC compact controller
The casing of the FläktGroup CMT.EC compact controller is suitable for mounting on
walls and in-wall flush boxes.
•Open the FläktGroup CMT.EC compact controller with a screwdriver and lift the
upper part upwards from the mounting plate
•Route the wires through the connection aperture in the mounting plate of the
CMT.EC compact controller.
•Install the mounting plate of the CMT.EC compact controller on the wall or on the
flush-mounted socket.
NOTICE!
•For mounting the FläktGroup CMT.EC compact controller on the wall, maintain
the specified drilling distance (see „Hole distance for the FläktGroup CMT.EC
Compact Controller“ on page 27).
•Make sure that the mounting plate is not deformed during installation.
NOTICE!
•At assembly, pay attention to the control unit on an in-wall flush box, especially
a hollow wall box, to avoid influencing the room temperature measurement. To
avoid draught, provide appropriate insulation of the flush-mounted socket, if
necessary.
•If the control panel is mounted on a flush-mounted socket, edges of the
mounting plate may remain visible, depending on the socket and the way it is
mounted. If necessary, use paint, wallpaper, or similar means to prepare the
installation surface.
•It is also possible to hide the visible edges of the mounting plate by using a wall-
lamp socket with vertical mounting dimensions (screw clearance) of 60 mm.
CMT.EC Compact Controller Assembly and Installation
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3.3 Installation of the FläktGroup CMT.EC Compact Controller
For the connection of the CMT.EC compact controller we recommend the use of the
following cables or a comparable model.
The following steps are necessary to connect the CMT.EC compact controller:
– Connecting mains electrical supply
– Connect HVAC equipment
– Possibly connect status signals
– Possibly connect external sensors
Terminal connections:
M1 Supply voltage phase (L)
M2 Supply voltage neutral wire (N)
M3 Common neutral wire voltage outputs
M4 Valve outlet – heater / heating or cooling change over
M5 Valve outlet – cooling
M6 Economy/presence contact
M7 Common connection window/economy*
M8 Window contact
M9 Remote room temperature sensor
M10 Common connection remote/changeover*
M11 Winter/summer changeover
M12 EC fan signal 0-10V positive (+)
M13 EC fan signal 0-10V positive (-)
* If several wires lead to this clamp, then an appropriate clamp connection must be created on-
site that conducts only one wire below this clamp.
Fig. 3-1: Terminal connections
Connection type Terminal number Manufacturer Cable type Cross section
Fan AC, valves 3, 4, 5 LAPP cable ÖLFLEX® CLASSIC 110 1.5 mm2
Status signal / Sensor inputs 6, 7, 8, 9, 10, 11, 12, 13 LAPP cable ÖLFLEX® CLASSIC 110 0.75 mm2
PHASE
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3.4 Functions of the FläktGroup CMT.EC compact controller
3.4.1 Fan control
The fan can be started under the following prerequisites:
– In case a flow sensor is connected and activated, the water temperature should be
suited to the operating mode (heating / cooling)
– If the compact controller was released by the window / fault contact
The fan mode is set with a rotary switch.
The 4 positions of the rotary switch are:
A = Automatic Mode
P = Programming of fan speed
1 = Fan speed 1
2 = Fan speed 2
3 = Fan speed 3
In the normal mode, the operation of the fan is dependent on:
– The relationship between the measured and desired room temperature
– Position of the fan rotary switch
– Position of dip switch number 3 (see fig. 3-1 on page 15)
– Fan continuous operation (Dip Switch on CON)
– Fan ON/OFF (fan is only switched on when the desired room temperature is not
attained) (Dip Switch on CYC)
– Fan start and stop delay of 30 seconds both in heating and cooling operation
In automatic mode the fan speed will be adjusted dependant on the setpoint and mea-
sured temperature. It will be proportionally reduced from maximum speed down to min-
imum speed in relation to the temperature being reached.
The temperature at which the compact controller switches between summer and winter
operation is called the neutral band (4 °K). In normal operation, the setpoint between
heating and cooling operation does not change.
When controller is switched on using the temperature dial the fan is activated accord-
ing to the rotational speed switch setting, fan speed 1, 2 and 3. The temperature control
switches the fan ON/OFF to the selected speed if no fan continuous operation is
selected using Dip Switch 3.
Fan start delay
Setting of the fan speed
In winter mode, the fan is only started after a fixed delay of 30 seconds in order to pre-
vent the draught formation.
1. Turn off the power of the device.
2. Remove the cover and note the configuration of the DIP switches. Remove the
jumper and any connected external temperature sensor located at the top area
of the right terminals as circled in red in fig. 3-2.
This configuration must be done by electrically trained or competently safety
orientated individuals.
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Fig. 3-2:
3. Turn power back on.
4. Turn the temperature setpoint dial to "P" ("Programming" as shown on the
cover) position. Internal LED will blink. Set the fan speed dial to the first-
speed stage. The cover can be positioned temporarily to set these dials (see
fig. 3-3).
Fig. 3-3:
Be aware of electric shock as there are now some parts of the controller exposed
that might have 230 V~. Use appropriate insulated tools.
1
2
3
4
5
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5. Select the desired voltage by using tab. 3-1. The DIP switches are numbered
from the top to bottom with 1 to 5. The 5th switch is reserved.
Tab. 3-1:
0-state = left,
1-state = right
6. Set the fan dial in second- and third-speed position and repeat step 5 for each
of the other 2 fan speeds.
7. Turn the temperature setpoint dial away from "P" (Programming) position, the
speed settings are saved.
8. Switch off the power.
9. Replace the jumper in case of using the internal temperature sensor or
reconnect the external temperature sensor. Reconfigure the DIP switches
according to the label under the temperature dial or as per the previous
setting noted at the start.
10. Mount the cover. Turn the power back on and the device is set with the
desired fan speeds.
Voltage value [V] DIP 4 DIP 3 DIP 2 DIP 1
1.0 0 0 0 0
1.6 0 0 0 1
2.2 0 0 1 0
2.8 0 0 1 1
3.4 0 1 0 0
4.0 0 1 0 1
4.6 0 1 1 0
5.2 0 1 1 1
5.8 1 0 0 0
6.4 1 0 0 1
7.0 1 0 1 0
7.6 1 0 1 1
8.2 1 1 0 0
8.8 1 1 0 1
9.4 1 1 1 0
10.0 1 1 1 1
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3.4.2 Heating and cooling valve outputs
On/Off control
With this setting, the output is regulated with a 6-periods-per-hour algorithm, whereby
the switch-on time is dependent on the P+I control signal. If the room temperature is at
50% on the proportional band, the output is switched 5 minutes ON and 5 minutes
OFF.
Fan-coil unit with an ON/OFF
Fig. 3-4: Fan coil unit with a 2-line ON/OFF heating valve output.
The desired room temperature is set at the upper tolerance limit of the proportional
band so that the valve is closed when the measured room temperature lies above the
setpoint.
Fig. 3-5: Fan coil unit with a 2-line ON/OFF cooling valve output.
The desired room temperature is set to the lower tolerance limit of the proportional
band so that the valve is closed when the measured room temperature lies below the
setpoint.
0%
100%
0%
100%
0%
100%
PROPORTIONAL
BAND
HEATING OUTPUT
TERMINAL 4
ROOM/RETURN
TEMPERATURE
SETPOINT
0%
100%
0%
100%
PROPORTIONAL
BAND
COOLING VALVE
OUTPUT TERMINAL 5
or 4 (4 PIPE or 2 PIPE)
ROOM/RETURN
TEMPERATURE
SETPOINT
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Fig. 3-6: Fan coil unit with a 4-line ON/OFF valve outputs.
The desired room temperature is set on the upper tolerance limit of the proportional
band when the compact controller is in heating mode and on the lower limit value when
it is in cooling mode.
3.4.3 Summer and winter operation switch-over
With a 2-pipe application, the switch-over of summer to winter operation takes place
with a contact connected to terminal 10 or an inlet-temperature sensor connected to
terminal 10/11 (fig. 3-1).
With a 4-pipe application, the switch-over from summer to winter operation takes place
on the basis of the measured room temperature and setpoint. If the room temperature
increases to greater than the setpoint plus a neutral band (factory setting 4 °K), the
compact controller is switched over to summer operation. Conversely, when the room
temperature falls below the setpoint minus the neutral band, the compact controller
switches to winter operation.
The room temperature setpoint is the same in summer as well as in winter operation.
If another setpoint is desired, it must be set with the temperature rotary switch.
3.4.4 Comfort and Economy Mode switch-over
In normal operation (Comfort Mode), there is the possibility of switching the compact
controller over to night operation (Economy Mode) with the digital input on terminal
6/7 (fig. 3-1).
The direction of operation for this input can be changed using dip switch 4.
When this dip switch is set on NO, the contact must be bridged to trigger Economy
mode. If the dip switch is set on NC, the contact must be opened to trigger Economy
mode.
If the economy mode is activated, the room temperature setpoint is reduced (in heating
operation) or increased (in cooling operation) with 4 °K.
3.4.5 Room frost protection
When the CMT.EC controller is turned off using the window contact, the room frost pro-
tection is activated with a temperature setpoint of 5 °C. This function is also active
when the controller is turned off using the temperature dial.
0%
100%
0%
100%
0%
100%
PROPORTIONAL
BAND
COOLING
VALVE
OUTPUT
TERMINAL 5
ROOM/RETURN
TEMPERATURE
SETPOINT
PROPORTIONAL
BAND
DEAD
ZONE
HEATING
VALVE
OUTPUT
TERMINAL 4
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