Herz 7708 Series User manual

HERZ Actuator 7708, 7990
Data sheet for 7708,7990 Issue 1115
Dimensions
Dimensions Installation height
1 7708 37
Dimensions Installation height
1 7708 31
1 7708 38
1 7708 39
1 7708 52
1 7708 53
17990 31
1 7990 32
Dimensions Installation height
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Data Sheet HERZ Armaturen 2015

Models
1770831
HERZ Actuator 2-point, M28x1.5, 230V, 50Hz
normally open, closing force 100N, operating voltage 230V~, threaded connection M28x1.5, blue adapter
1 7708 85 is included, max. stroke 5mm
1770837 HERZ Actuator 2-point with end switch, M28x1.5, 230V, 50Hz
normally closed, closing force 100N, operating voltage 230V~, threaded connection M28x1.5, blue adapter
1 7708 85 is included, max. stroke 5mm
1 7708 38
HERZ Actuator 2-point, M28x1.5, 24V, 50Hz
normally closed, closing force 100N, operating voltage 24V~, threaded connection M28x1.5, blue adapter
1 7708 85 is included, max. stroke 5mm
1 7708 39
HERZ Actuator 2-point, M28x1.5, 230 V, 50Hz
normally closed, closing force 100N, operating voltage 230V~, threaded connection M28x1.5, blue adapter
1 7708 85 is included, max. stroke 5mm
1 7708 52
HERZ Actuator 2-point, M28x1.5, 24V, 50Hz
normally closed, closing force 100N, operating voltage 24 V~, threaded connection M28x1.5, red adapter
1 7708 90 is included, max. stroke 5mm
1 7708 53
HERZ Actuator 2-point, M28x1.5, 230V, 50Hz
normally closed, closing force 100N, operating voltage 230 V~, threaded connection M28x1.5, red adapter
1 7708 90 is included, max. stroke 5mm
17990 31 HERZ Actuator modulating 0..10 V, M28x1.5, 24V, 50Hz
normally closed, closing force 100N, operating voltage 24V~, threaded connection M28x1.5, blue adapter
1 7708 85 is included, max. stroke 5mm
1 7990 32 HERZ Actuator modulating 0..10 V, M28x1.5, 24V, 50Hz
normally closed, closing force 125N, operating voltage 24V~, threaded connection M28x1.5, blue adapter
1 7708 85 is included, with valve path recognition, max. stroke 6,5mm
Application 1 7708 37
The HERZ-Actuator 230 V with end switch is a thermoelectric valve drive for opening and closing valves and small valves
used in the scope of HVAC technology. The integrated micro switch with floating contact allows direct operation of a
pump or fan control unit. The HERZ Actuator 230 V with end switch is controlled by a 230 V room thermostat with two-
point output or pulse-width modulation.
Application 1 7708 31, 1 7708 38, 1 7708 39, 1 7708 52, 1 7708 53
The HERZ-Actuator 230 V / 24 V is a thermoelectric valve drive for opening and closing valves on heating circuit distribu-
tors of concealed floor heating and cooling systems. The main field of application is the energy-efficient individual room
temperature control in the range of building management systems and home automation. The HERZ-Actuator 230 V /
24 V is controlled by a 230 V / 24 V room thermostat with two point output or pulse-width modulation.
Application 1 7990 31, 1 7990 32
The HERZ-Actuator 2-point, Proportional 5/6,5 mm is a thermoelectric actuator for the control of heating and cooling
systems in direct proportion to the applied control voltage. The control of the actuators is performed by a 0-10 V DC
signal via a central DDC system or by a room thermostat. Principal area of application is the building management sys-
tem range.
Furthermore, the variant 1 7990 32 with valve path recognition automatically register the valve path for an optimum use
of the active control voltage range. This guarantees an even more precise control of all valves.
Operation
The actuating drive is switched on via an electrical contact, e.g. from a room thermostat, and starts opening or closing
the thermostatic valve. The actuating movement is accomplished by an electrically-heated expansion element. When
the heating current is switched off, the valve closes or opens respectively. The HERZ actuating drive is maintenance-free
and offers silent operation.
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Data Sheet HERZ Armaturen 2015

Emergency function
With factory setting “normally closed” the valve can be opened by removing the drive in case of a power failure.
Installation 1 7708 31, 1 7708 37, 1 7708 38, 1 7708 39, 1 7708 52, 1 7708 53
The wide selection of valve adapters guarantees a perfect match of the HERZ-Actuator to almost any valve bottom or
manifold available on the market. Simply snap-on the HERZ-Actuator to the manually pre-installed valve adapter.
• First the valve adapter is screwed on the valve manually.
• The HERZ-Acutator is placed vertically on the valve adapter.
Installation 1 7990 31, 1 7990 32
The valve adapter assortment guarantees a perfect match of the actuator to almost all valve bottoms and heating circuit
distributors available on the market. The HERZ ActuatorProportional is simply plugged on to the valve adapter previously
installed manually.
Screw the adapter manu-
ally onto the valve.
Connect the line to the ac-
tuator.
Position the HERZ Actua-
tor manually in vertical po-
sition to the valve adapter.
Latch the HERZ Actuator
to the valve adapter by
manually applied vertical
pressure; this can be done
noiselessly and without
any problems.
Installation position
The HERZ-Actuator must be installed preferably in vertical or horizontal installation position. For “upside down” installa-
tion special circumstances (e. g. drainwater) can reduce the lifetime of the actuator.
Vertical Horizontal Upside down
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Data Sheet HERZ Armaturen 2015

Technical data 1 7708 31, 1 7708 39, 1 7708 53
Operating voltage 230 V AC, +10%...–10%, 50/60 Hz
Max. inrush current < 550 mA during 100 ms max.
Operating power 1 W 1)
Stroke (actuator travel) 5.0 mm
Actuating force 100 N ±5%
Fluid temperature 0 to +100°C 2)
Storage temperature -25°C to +60°C
Ambient temperature 0 to +60°C
Type of protection IP 54 3) / II
CE conformity according to EN 60730
Housing material/housing colour Polyamide / light grey (RAL 7035)
Connecting cable/colour 2 x 0.75 mm2PVC / light grey (RAL 7035)
Cable length 1 m
Weight with connecting cable (1 meter) 100 g
Surge protection according to EN 60730-1 min. 2.5 kV
1) measured with precision reference instrument LMG95 - 2) in dependence of the adapter even higher - 3) in all installation positions
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Data Sheet HERZ Armaturen 2015
Technical data 17708 38, 1 7708 52
Operating voltage 24 V AC/DC, +20%...-10%
Max. inrush current < 300 mA during 2 min. max.
Operating power 1 W
1)
Stroke (actuator travel) 5.0 mm
Actuating force 100 N ±5%
Fluid temperature 0 to +100°C 2)
Storage temperature –25°C to +60°C
Ambient temperature 0 to +60°C
Type of protection IP 54 3) / III
CE conformity according to EN 60730
Housing material/housing colour Polyamide / light grey (RAL 7035)
Connecting cable/colour 2 x 0.75 mm2PVC / light grey (RAL 7035)
Cable length 1 m
Weight with connecting cable (1 meter) 100 g
Surge protection according to EN 60730-1 min. 2.5 kV
1) measured with precision reference instrument LMG95 - 2) in dependence of the adapter even higher - 3) in all installation positions
Technical data 17708 37
Operating voltage 230 V AC, -10%...+10%, 50/60 Hz
Max. inrush current < 550 mA during max. 100 ms
Operating power 1 W
1)
Stroke (actuator travel) 5.0 mm
Actuating force 100 N ±5%
Switching current for micro switch 230 V AC: 5 A resistive load, 1 A inductive load
Switching point of micro switch NC approx. 2 mm
Fluid temperature 0 - +100°C 2)
Storage temperature -25 °C to +60°C
Ambient temperature 0 to +60°C
Degree / class of protection IP 54 3) / II
CE conformity according to EN 60730
Casing material / colour Polyamide / light grey (RAL 7035)
Connection line / colour 4 x 0.75 mm² PVC / light gray (RAL 7035)
Cable length 1 m
Weight with connecting cable (1 m) approx. 150 g
Surge protection according to EN 60730-1 min. 2.5 kV
1) measured with precision reference instrument LMG95 - 2) in dependence of the adapter even higher - 3) in all installation positions

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Data Sheet HERZ Armaturen 2015
Technical data 17990 31, 1 7990 32
Voltage 24 V AC, -20 %... +20 %
Control voltage range 0 V… 10 V DC
Max. inrush current < 300 mA for max. 2 Min.
Operating power 1. W
1) (1 7990 31) / 1,2 W1) (1 7990 32)
Resistance of control voltage input 100 kΩ
Stroke 5 mm (1 7990 31) / 6.5 mm (1 7990 32)
Actuating force 100 N ±5% (1 7990 31) / 125 N ±5% (1 7990 32)
Fluid temperature 0 to +100°C 2)
Storage temperature -25°C to +65°C
Ambient temperature 0 to +60°C
Degree / class of protection IP 54 3) / III
CE conformity according to EN 60730
Casing material / colour Polyamid / white
Connection line / colour 3 x 0.22 mm² PVC / white
1) measured with precision reference instrument LMG95 - 2) in dependence of the adapter even higher - 3) in all installation positions
Room thermostat
Standard room thermostats equipped with a thermal feedback loop can be used for piloting the HERZ actuating drive. If
required, several drives can be connected in parallel taking the maximum admissible electrical load of the switch contact
into account.
Design and planning notes
When selecting the switch contacts and mains fuses, the inrush current of the heating element must be taken into ac-
count. The voltage loss in the electric lines must not exceed 10%, ensuring that the indicated runtime is guaranteed.
Max. cable length for an actuating drive with given cable cross-sections (information with voltage drop approx. 5%; at
230V voltage drop is 10V, at 24V voltage drop is 1V).
When using several actuating drives, the indicated cable length must be divided by the number of actuating drives con-
nected.
Cable cross-section (mm2)230V, max. length (m) 24 V, max. length (m)
2 x 0.75 1500 168
2 x 1.0 2000 224
2 x 1.5 3000 340
2 x 2.5 5000 560
Resistance values
Please refer to the HERZ standard diagrams contained in the relevant standard sheets with regard to resistance values
when operating HERZ valves with HERZ actuating drives. The curves "Valve fully open" or "max." apply.

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Data Sheet HERZ Armaturen 2015
1779025 HERZ Electronic room temperature controller for 2-point control
1 switchover contact
Setpoint range 10– 30°C
Switching differential +/-0.2K fixed
Operating voltage 24 V
1779423 HERZ Electronic climate controller with PI behavior
For heating and cooling operation, with programmable time and temperature settings. Outputs for actuat-
ing drive (3-point) and thermal drive and for one pump or fan (ON/OFF signal) Fixed basic program (factory
setting) for initial commissioning, easy adaptation to the system by selecting of one out of 8 basic control
modules via service parameters. Housing can be plugged onto electronics, white (RAL9010), front with
keypad and digital displays in viewing window. Timer with weekly and annual programs, relay with operat-
ing hours counter. For wall mounting or mounting onto in-wall socket.
1779604 HERZ Transformer 230/24V
The overload-proof HERZ safety transformer 230/24V is designed for the connection of HERZ room thermostats and
HERZ actuating drives and suitable for operation of 8 HERZ actuating drives max.
Version as per VDE0551
Protection class II
Protection class IP20
ISO Cl. T40/E
Input voltage 230V
Fuse in input circuit 50-60Hz, 315mA
Output voltage 24V
Power 50VA
Quick installation on device rail ref. DIN42227/3
Dimensions 106x90x74mm (BxHxT)
1779123 HERZ Electronic room temperature controller for 2-point or pulse control with
timer
For individual control with programmable times and temperatures. Timer with weekly and annual
programs, automatic switchover from summer to winter time.
Setpoint range 8– 38°C
Switching differential as 2-point controller 0.4– 8K
Measurement accuracy 0.3K at 20°C
Operating voltage 230V
1779015 HERZ Electronic room temperature controller for 2-point control
1 switchover contact
Setpoint range 10– 30°C
Switching differential +/-0.2K fixed
Operating voltage 230V
1 7940 62 HERZ-RTC-2 Room Temperature Computer
With 3 weekly programmes, 4 temperature steps, vacation programme for heating and cooling,
switching difference adjusting. Set value range 5–40 °C, operating voltage 24 V, output voltage
0–10 V.

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Data Sheet HERZ Armaturen 2015
Electric connections 17708 38, 1 7708 39, 1 7708 53
We recommend usage of the following lines
for installing a 230 V system:
Light plastic-sheathed cable NYM 1.5 mm² or
flat webbed building wire NYIF 1.5 mm²
Electric connections 17708 38, 1 7708 52
We recommend usage of the following lines
for installing a 24 V system:
Light plastic-sheathed cable NYM 1.5 mm² or
flat webbed building wire NYIF 1.5 mm²
Note: All diagrams are for illustrating purposes only and do not claim to be complete. All information contained in this brochure corresponds to the state of knowledge at the time of
going to print and is intended for informational purposes only. We therefore reserve the right to make any changes subject to advancing technology. The images are symbolic represen-
tations only and can therefore visually deviate from the actual appearance of products. Any deviations in color are due to typography. Subject to country-specific product variants. We
reserve the right to change specifications and functions without notice. Please contact your nearest HERZ subsidiary if you have any questions.
Electric connections 1 7708 37
We recommend usage of the following lines
for installing a 230 V system:
Light plastic-sheathed cable NYM 1.5 mm² or
flat webbed building wire NYIF 1.5 mm²
Electric connections 17990 31, 1 7990 32
Calculation of maximum cable length (copper cable) for 24 V rated voltage
L = C x A / n
L Cable length in m; K Constant (269 m/mm²); A Conductor cross-
section in mm²; n Number of Alpha-Actuators
We recommend the following cables for installing a 24 V system:
Telephone line J-Y(ST)Y 0.8 mm2
Light plastic-sheathed cable: NYM 1.5 mm²
Flat webbed building wire: NYIF 1.5 mm²
Transformer: A safety isolating transformer according to EN 61558-
2-6 must always be used. Transformer dimensioning results from
the making capacity of the HERZ-Actuators.
Rule-of-thumb formula: Ptransformer = 7.2 W x n
n = Number of OEM Actuators