MT4-024
® U.S. Registered Trademark EN0B-0490GE51 R0709
Copyright © 2009 Honeywell Inc. • All rights reserved
MT4-024/MT4-230
MT8-024/MT8-230
SMALL LINEAR THERMOELECTRIC ACTUATORS
Smart-T
PRODUCT DATA
APPLICATION
Smart-T small linear actuators are used in room and zone
applications for time-controlled two-point and pulse-width-
modulated (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).
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
MT8: 8 mm
Power supply MTx-024: 24 Vac/dc ± 20%
MTx-230: 230 Vac +10% ... -15%
Stem force 90 N
Opening/closing time dependent on ambient tem-
perature (see Table 3)
Ambient temperature max. 50°C
Electrical
specifications
See Table 3 on page 3.
Protection standard IP44 in all mounting positions
Cable length 1 m, other cable lengths upon
request
Cable wires MTx-xxx: 2 x 0.5 mm
2
MTx-xxxS: 4 x 0.35 mm
2
Max. permissible
auxiliary switch
current
MTx-xxxS: 5 (3) A
Medium temperature max. 120 °C
MT SMALL LINEAR THERMOELECTRIC ACTUATORS
EN0B-0490GE51 R0709
2
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
2.5 m cable length
MT4-024LC-NC normally closed
MT4-024LC-NO normally open
with low power
consumption
MT4-024S-NC normally closed
MT4-024S-NO normally open
with auxiliary switch
24 Vac/dc
MT4-230-NC normally closed
MT4-230-NO normally open
MT4-230-NC-2.5M normally closed
MT4-230-NO-2.5M normally open
2.5 m cable length
MT4-230LC-NC normally closed
MT4-230LC-NO normally open
with low power
consumption
MT4-230S-NC normally closed
MT4-230S-NO normally open
with auxiliary switch
230 Vac/dc
4 mm
MT8-024-NC normally closed
MT8-024-NO normally open
MT8-024-NC-2.5M normally closed
MT8-024-NO-2.5M normally open
2.5 m cable length
MT8-024LC-NC normally closed
MT8-024LC-NO normally open
with low power
consumption
MT8-024S-NC normally closed
MT8-024S-NO normally open
with auxiliary switch
24 Vac/dc
MT8-230-NC normally closed
MT8-230-NO normally open
MT8-230-NC-2.5M normally closed
MT8-230-NO-2.5M normally open
2.5 m cable length
MT8-230LC-NC normally closed
MT8-230LC-NO normally open
with low power
consumption
MT8-230S-NC normally closed
MT8-230S-NO normally open
with auxiliary switch
230 Vac/dc
8 mm
*Without power, in combination with standard 2-way valve; "normally closed" = stem extends, "normally open" = stem retracts
Table 2. Accessories
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
cable suitable for MT4-024/-230/-024LC/-0230LC and MT8-024/-230/-
024LC/-0230LC, 10 units
EVA10RA Danfoss-RA adapters, 10 units
HCA1VEL Mounting adapter for Velta compact manifold
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