SMALL LINEAR THERMOELECTRIC ACTUATORS
Smart-T
APPLICATION
Smart-T small linear actuators are used in room and zone
applications for time-controlled two-point and pulse-widthmodulated (PWM*) regulation of heating and cooling systems
such as fan coil units, radiators, floor heating systems, chilled
ceilings, and convectors.
• Fit on standard M30 x 1.5 heating/cooling valves,
thermostatic radiator valves, and valve inserts for
manifolds and compact radiators.
• Special valve adapters on request.
*Recommended controllers: Excel 10 and Excel 12 controllers
(use with other, non-Honeywell controllers may adversely
influence PWM-operation).
MT4-024/MT4-230
MT8-024/MT8-230
PRODUCT DATA
FEATURES
• No mounting tools required (easily mounted using
valve adapter)
• Water-protected housing design in all mounting
positions
• Pluggable cable for easy installation and servicing
• Auxiliary switch models for driving pumps or fans
• Low power consumption models
• Normally-open and normally-closed models
• Compact design allows installation in limited space
• Visual indicator showing valve position and type of
action (NO or NC)
• Noiseless operation
• Reliable long-term operation
• Overload protection (4 kV) for 230 V models
SPECIFICATIONS
Max. stroke MT4: 4 mm
Power supply MTx-024: 24 Vac/dc ± 20%
Stem force 90 N
Opening/closing time dependent on ambient tem-
Ambient temperature max. 50°C
Electrical
specifications
Protection standard IP44 in all mounting positions
Cable length 1 m, other cable lengths upon
Cable wires MTx-xxx: 2 x 0.5 mm
Max. permissible
auxiliary switch
current
Medium temperature max. 120 °C
MT8: 8 mm
MTx-230: 230 Vac +10% ... -15%
perature (see Table 3)
See Table 3 on page 3.
request
2
MTx-xxxS: 4 x 0.35 mm2
MTx-xxxS: 5 (3) A
® U.S. Registered Trademark EN0B-0490GE51 R0709
Copyright © 2009 Honeywell Inc. • All rights reserved
MT SMALL LINEAR THERMOELECTRIC ACTUATORS
ORDERING INFORMATION
Table 1. Actuators
order number action* additional features voltage stroke
MT4-024-NC normally closed
MT4-024-NO normally open
MT4-024-NC-2.5M normally closed
MT4-024-NO-2.5M normally open
MT4-024LC-NC normally closed
MT4-024LC-NO normally open
MT4-024S-NC normally closed
MT4-024S-NO normally open
MT4-230-NC normally closed
MT4-230-NO normally open
MT4-230-NC-2.5M normally closed
MT4-230-NO-2.5M normally open
MT4-230LC-NC normally closed
MT4-230LC-NO normally open
MT4-230S-NC normally closed
MT4-230S-NO normally open
MT8-024-NC normally closed
MT8-024-NO normally open
MT8-024-NC-2.5M normally closed
MT8-024-NO-2.5M normally open
MT8-024LC-NC normally closed
MT8-024LC-NO normally open
MT8-024S-NC normally closed
MT8-024S-NO normally open
MT8-230-NC normally closed
MT8-230-NO normally open
MT8-230-NC-2.5M normally closed
MT8-230-NO-2.5M normally open
MT8-230LC-NC normally closed
MT8-230LC-NO normally open
MT8-230S-NC normally closed
MT8-230S-NO normally open
*Without power, in combination with standard 2-way valve; "normally closed" = stem extends, "normally open" = stem retracts
order number description
MT-CLIP mounting clip, 10 units
MT-ADAPT-HW mounting adapter M30 x 1.5, 10 units
MT-ADAPT-HP mounting adapter for Herz/Polytherm valves, 10 units
MT-CABLE-1.5M
MT-CABLE-2.5M
MT-CABLE-5M
MT-CABLE-10M
EVA10RA Danfoss-RA adapters, 10 units
HCA1VEL Mounting adapter for Velta compact manifold
2.5 m cable length
24 Vac/dc
with low power
consumption
with auxiliary switch
4 mm
2.5 m cable length
230 Vac/dc
with low power
consumption
with auxiliary switch
2.5 m cable length
24 Vac/dc
with low power
consumption
with auxiliary switch
8 mm
2.5 m cable length
230 Vac/dc
with low power
consumption
with auxiliary switch
Table 2. Accessories
cable suitable for MT4-024/-230/-024LC/-0230LC and MT8-024/-230/024LC/-0230LC, 10 units
EN0B-0490GE51 R0709
2
MT SMALL LINEAR THERMOELECTRIC ACTUATORS
ELECTRICAL SPECIFICATIONS
Table 3. Electrical specifications
order number
MTx-024-xx, MTx-024S-xx ~0.7 A < 0.1 A < 3 W 4.0 min 6.0 min
MTx-024LC-xx ~0.2 A < 0.05 A < 2 W 6.0 min 7.5 min
MTx-230-xx, MTx-230S-xx ~0.6 A** 0.014 A 3 W 2.5 min 3.5 min
MTx-230LC-xx ~0.4 A** 0.010 A 2 W 3.5 min 5.5 min
*All values at nominal voltage. **Average during first 500 msec.
initial
current*
permanent
current*
power
consumption*
min. runtime for full nominal valve stroke
4 mm models 8 mm models
MOUNTING
NOTE: Connection leads must not touch piping (heat
transfer).
Fig. 1. Mounting / installation positions
Fig. 2. Dismounting
FUNCTION
When the operating current is applied, a PTC resistor heats
up a wax element. After a delay, this wax element expands,
causing stroke movement.
3
EN0B-0490GE51 R0709
MT SMALL LINEAR THERMOELECTRIC ACTUATORS
Position Indicator
The position indicator (the red indicator behind the window on
the face of the actuator) shows the model's type of action (NO
or NC) as well as the current stroke position.
NC NO
Fig. 3. Position indicator
WIRING
grün, vert, verde,
green, zielony
grün, vert, verde,
green, zielony
braun, brun, marrone,
brown, brazowy
blau, bleu, blu,
blue, niebieski
230 Vac / 24 V
R-T
230 Vac / 24 V
MTx-xxxS
5 A (3)
3 W
Ω
MTx-xxx, MTx-xxxLC
braun, brun, marrone,
brown, brazowy
blau, bleu, blu,
blue, niebieski
R-T
230 Vac / 24 V
Fig. 4. Wiring diagrams
Ω
3 W
(MTx-xxxLC: 2 W)
Opening and Closing Time
stroke
power
NOTE: Opening and closing times depend upon ambient
NO
NC
on
off
dead
time
opening
time
Fig. 5. Opening and closing time
temperature and model.
dead
time
closing
time
time
EN0B-0490GE51 R0709
4
MT SMALL LINEAR THERMOELECTRIC ACTUATORS
Valve Action
NC (normally-closed) version
NC NO NC NO
AB
A
A
AB
B
AB
B
Fig. 6. Valve action
Normally open: 2-way valve, A-B open without power;
Normally closed: 2-way valve, A-B shut without power;
NOTE: Fig. 6 is a schematic diagram showing typical valve
action. Actual function can vary depending upon the
individual type of valve.
NO (normally-open) version
AB
A
A
AB
B
AB
B
DIMENSIONS
H
X
L
dimension
W
H
W
L
X
Fig. 7. Dimensions (in mm)
MT4-xxx MT8-xxx
42
59
67
45
6
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Rolle, Z.A. La Pièce 16, Switzerland by its Authorized Representative:
Automation and Control Solutions
Honeywell GmbH
Böblinger Strasse 17
71101 Schönaich
Germany
Phone: (49) 7031 63701
Fax: (49) 7031 637493
http://ecc.emea.honeywell.com
Subject to change without notice. Printed in Germany
EN0B-0490GE51 R0709
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