MD15-C, MD15-HR and MD15-DA Actuators
For Rxx, RWxx valves and Danfoss RA Series
Application
The MD15-C, MD15-HR and MD15-DA actuators for three-point,
two-point or continuous closed-loop control in zone post-treatment
devices for heating, ventilation and air conditioning systems.
Product Description
MD15-C, MD15-HR, MD15-DA
Q
Content Page
Important Information Regarding Product Safety ..................................................................................................2
MD15-C, MD15-HR and MD15-DA Actuators .......................................................................................................3
Technical Data.....................................................................................................................................................3
Dimensions ..........................................................................................................................................................4
Connection...........................................................................................................................................................5
Valve Installation....................................................................................................................................................6
Mounting and Commissioning the Actuator ...........................................................................................................7
Dismounting the Actuator ....................................................................................................................................11
Manual adjustment ..............................................................................................................................................13
Commissioning ....................................................................................................................................................14
Kieback&Peter GmbH & Co. KG
Tempelhofer Weg 50, 12347 Berlin/Germany
Telefon: +49 30 60095-0, Telefax: +49 30 60095-164
www.kieback-peter.de, info@kieback-peter.com
3.09-20.115-01-EN | 2019-08-12
Product Description
MD15-C, MD15-HR, MD15-DA
Q
Important Information Regarding Product Safety
Safety Instructions
This data sheet contains information on installing and commissioning the product "MD15-C,
MD15-HR, MD15-DA". Each person who carries out work on this product must have read and understood this data sheet. If you have any questions that are not resolved by this data sheet, you can
obtain further information from the supplier or manufacturer.
If the product is not used in accordance with this data sheet, the protection provided will be impaired.
Applicable regulations must be observed when installing and using the device. Within the EU, these
include regulations regarding occupational safety and accident prevention as well as those from the
VDE (Association for Electrical, Electronic & Information Technologies). If the device is used in other
countries, it is the responsibility of the system installer or operator to comply with local regulations.
Mounting, installation and commissioning work on the devices may only be carried out by qualified
technicians. Qualified technicians are persons who are familiar with the described product and who
can assess given tasks and recognize possible dangers due to technical training, knowledge and
experience as well as knowledge of the appropriate regulations.
Legend
!
WARNING
Indicates a hazard of medium risk which can result in death or severe bodily injury if it is not avoided.
CAUTION
Indicates a hazard of low risk which can result in minor or medium bodily injury if it is not avoided.
CAUTION
Indicates a hazard of medium risk which can result in material damage or malfunctions if it is not
avoided.
NOTE
Indicates additional information that can simplify the work with the product for you.
Notes on Disposal
For disposal, the product is considered waste from electrical and electronic equipment (electronic
waste) and must not be disposed of as household waste. Special treatment for specific components
may be legally binding or ecologically sensible. The local and currently applicable legislation must be
observed.
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Page 2 / 14
MD15-C, MD15-HR and MD15-DA Actuators
MD15-DA Small actuator for radiator valves that were
manufactured by Danfoss of the RA-N, RA-FN
or RA-U series
MD15-C Small actuator for valve series D15xx and
W15xx (manufacturer Controlli, series VST and
VMT) that were discontinued in 2003
MD15-HR Small actuator for valve series R15/x and
RW15/x (manufacturer Hora, series 216Z and
316Z) that were discontinued in 11-2015
Technical Data
Nominal voltage AC 24 V ± 10%; 50/60 Hz; DC 24 V ± 10%
Power consumption Dimensioning: 3.7 VA (AC 24 V); 1.7 W (DC 24 V)
Nominal: 2.5 VA (AC 24 V); 1.3 W (DC 24 V)
Switch-on current Max. 10 A for a short time
Control Three-point signal (open/stop/close), two-point signal (open/close) or
Continuous control DC 0(2)..10 V, < 0.5 mA, invertible
Connection Built-in cable
1.5 m; 3 x 0.5 mm
Motor switch-off Actuator spindle: when extending = load-dependent, when retracting =
path-dependent
Display LED display for operating voltage and status
Actuating noise < 28 dB (A)
Positioning stroke MD15-C 6 mm; MD15-HR 9 mm and MD15-DA 3 mm
Positioning time 22 s/mm
Positioning force MD15-C and MD15-HR: nominal 200 N
MD15-DA: nominal 100 N
Position indicator Stroke range scale
Manual adjustment Only when disconnected from the power supply
Socket for hexagon key under the cover nipple on the actuator cover, 4 mm
key socket
Valve exercise Can be switched on
Permissible medium
temperature in the
valve
Ambient temperature 0..50° C
Ambient humidity During operation: 0..85% r.h., non-condensing
Overvoltage category III
Level of contamination
Degree of protection IP54 only with the appropriate installation position (see page 12)
Protection class III
0..120° C
Out of operation: 0..85% r.h., non-condensing
2
Product Description
MD15-C, MD15-HR, MD15-DA
Q
2
Page 3 / 14
3.09-20.115-01-EN | 2019-08-12
Product Description
MD15-C, MD15-HR, MD15-DA
Q
Dimensions
Installation position 360°
Maintenance Maintenance-free
Weight 250 g
- MD15-C, MD15-HR
86,5 48,5
51
M30x1 DIN 13 (MD15-HR)
M30x1,5 DIN 13 (MD15-C, MD15-HE)
- MD15-DA
86,5 48,5
51
60
75
M30x1,5 DIN 13
60
75
18,6
M4
M30x1,5 DIN 13
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Ø
25,8
Ø
28,8
Page 4 / 14
Connection
MD15-C, MD15-HR, MD15-DA
- Continuous control
MD15-C, MD15-HR,
MD15-DA
M
1
2
3
BN
BU
0 V AC/DC
24 V AC/DC
Y = 0/2..10 V DC
- Three-point control - Two-point control
GY
Product Description
Q
!
MD15-C, MD15-HR,
MD15-DA
M
1
2
3
BU
BN
GY
0 V AC/DC
24 V AC/DC
CAUTION
Temporary peak loads of up to 10 A may occur when switching on the actuator. Ensure suitability of
switching components (e.g. controller connection) to ensure proper functioning and to avoid malfunctions and damage.
NOTE
The actuation direction can be changed by switching the supply lines to terminals 2 and 3 on the
actuator or by setting DIP switch 3.
0 V AC/DC
24 V AC/DC
MD15-C, MD15-HR,
MD15-DA
M
1
2
3
BU
BN
GY
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Product Description
MD15-C, MD15-HR, MD15-DA
Q
Valve Installation
CAUTION
!
The valve may only be installed by qualified technicians. In addition to the generally applicable installation guidelines, the following items are to be observed:
■ The pipeline system and the fixture interior must be free of foreign objects. In the event of contam-
inated media, dirt collectors are to be inserted upstream of the valves with fine screens, mesh width
0.25 mm.
■ There must be no tension between the valve and the pipeline connection.
■ To avoid eddy formations in the valve body, the valve should be installed in a straight section of the
pipe. A distance of 10 times the nominal diameter is recommended between the valve flange and
manifold or other similar parts.
■ The installation location is to be selected so that the ambient temperature at the actuator is kept
between 0 °C–+50°C.
■ When carrying out installation, the permissible max. pressure difference p and the specified
direction of flow must be observed (see table in "Types" section, as well as the "Valve Principle").
■ The three-way valves are to be used as mixing valves. Pay attention to the direction of flow (see
fig. "Valve Principle").
■ Once the valve is installed, make sure the ball in the valve seating can be moved easily by pushing
in the valve stem.
■ To install the actuator and remove the housing cover, approx. 170 mm of free space is required
above the actuator.
■ Observe the direction arrow on the valve body. Inverting the direction of flow impairs control
behavior.
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Mounting and Commissioning the Actuator
CAUTION
!
Do not electrically operate MD15-C, MD15-HR, MD15-DA Kleinstellantrieb without a valve.
CAUTION
Installation and commissioning work may only be carried out by qualified technicians.
If the valve is installed in the system, make sure that no differential pressure builds up in the valve
body before beginning work. If necessary, close the gate valve and turn off pumps. After the pipeline
has cooled off, the actuator can be installed.
Be sure to comply with VDE guidelines and local wiring regulations. The device is connected
according to the legally binding system circuit diagram.
Installation: MD15-C and MD15-HR
°
0
6
3
Product Description
MD15-C, MD15-HR, MD15-DA
Q
1 2 3 4
%%
1 2 3
5 6
9 10 11
7
8
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Q
Product Description
MD15-C, MD15-HR, MD15-DA
► Place the actuator on the threaded connection of the valve and tighten hand-tight using the union
nut.
► Establish the electrical connection.
► After the line power has been switched on, an automatic initialization run takes place. The
actuator first travels to the upper end position and then to the lower end position.
The actuator will not respond to the control signal until the initialization run is complete.
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Page 8 / 14
Mounting the MD15-DA
°
0
6
3
Danfoss
RA-N DN 10... 25
RA-FN DN 10... 25
RA-U DN 10... 20
Product Description
MD15-C, MD15-HR, MD15-DA
Q
2mm
1 2 3
5 6 7 8
1 2 3
9 10 11
4
12
Page 9 / 14
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Product Description
MD15-C, MD15-HR, MD15-DA
%%
13 14 15 16
► Place the valve adapter onto the valve and tighten the hexagon socket screw
(see figure 5).
► Place the actuator on the threaded connection of the valve and tighten hand-tight using the union
nut (see figure 7).
► Establish the electrical connection.
► After the line power has been switched on, an automatic initialization run takes place. The
actuator first travels to the upper end position and then to the lower end position.
The actuator will not respond to the control signal until the initialization run is complete.
NOTE
When the unit is remounted, you must adapt the valves again by performing a reinitialization (see
page 14).
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Page 10 / 14
Dismounting the Actuator
CAUTION
Before beginning to remove the unit, make sure that no differential pressure builds up in the valve
body before beginning work. If necessary, close the gate valve and turn off pumps.
After the pipeline has cooled off, you can begin removing the actuator.
CAUTION
!
Before beginning to remove the unit, put the actuator in the top position.
Removal: MD15-C and MD15-HR
100%
Product Description
MD15-C, MD15-HR, MD15-DA
Q
1 2 3 4
5
► Move the actuator to the top position using a control signal.
► Disconnect the actuator from the line power. Then disconnect all electrical connections.
► Loosen the union nut.
► Remove the actuator from the valve.
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Q
Product Description
MD15-C, MD15-HR, MD15-DA
Removal: MD15-DA
100%
1 2 3 4
5 6 7
► Move the actuator to the top position using a control signal.
► Disconnect the actuator from the line power. Then disconnect all electrical connections.
► Loosen the union nut.
► Remove the actuator from the valve.
► Loosen the hexagon socket screw on the valve adapter.
► Remove the valve adapter.
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Page 12 / 14
Manual adjustment
CAUTION
!
!
Manual adjustment may only be performed when the actuator is installed.
► Disconnect the actuator from the power supply.
► Fold the cover nipple to the side.
► A hexagon key (key socket 4 mm) can be used to move the
actuator into any position.
CAUTION
If you manually adjust until the slip clutch responds, turn the hexagon key half a turn in the opposite
direction after the manually set stroke position has been reached.
Product Description
MD15-C, MD15-HR, MD15-DA
Q
NOTE
An initialization run must be performed after a manual adjustment.
This occurs during operation when a valve end position is reached as part of normal operation.
You can perform this initialization manually by actuating switch 6, see p. 15.
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3.09-20.115-01-EN | 2019-08-12
Product Description
MD15-C, MD15-HR, MD15-DA
Q
Commissioning
Valve Functions
The valve functions are adjusted with switches (A) 1 to 6 under the connection cover.
Function with switch position ON Switch (A) Function with switch position OFF
Reinitialization ON->OFF/OFF ->ON Reinitialization ON->OFF/OFF ->ON
No function No function
No function No function
Actuating direction and position feedback 100..0%
DC 2..10 V DC 0..10 V
Valve exercise on Valve exercise off
Switch 1: Valve exercise
If plant specifications permit, the valve exercise feature may be activated during commissioning.
Valve exercise prevents the cone from jamming when the valve is not
moved for a long period of inactivity, e.g. for heating systems during the
summer.
If valve exercise is activated, the valve cone is raised for a few seconds
when there is no movement for 21 days.
Default setting: off
Switch 2: sets the control range for the continuous actuating signal to
DC 0..10 V or DC 2..10 V
Default setting: DC 0..10 V
ON
6
5
4
Actuating direction and position feed-
3
back 0..100%
2
1
A
Switch 3: sets the actuating direction and position feedback for a con-
trol voltage of DC 10 V to “valve open” or “valve closed” .
Default setting: 0..100%; “valve open”
Switch 6: Reinitialization
When the unit is remounted, you must adapt the valves again by performing a reinitialization.
You can do this by moving switch 6 from “OFF” to “ON” or from “ON” to
“OFF”.
The LED (under the connection cover) flashes during initialization.
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