Data Sheet

ManualsBrandsHoneywell Home ManualsActuators for underfloor heatingThermal actuator, passive (NC) thermal Honeywell Home

® U.S. Registered Trademark EN0B-0490GE51 R1006

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.

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

MTx-xxxS: 4 x 0.35 mm

Max. permissible

auxiliary switch

current

MTx-xxxS: 5 (3) A

Medium temperature max. 120 °C

Summary of content (5 pages)

PAGE 1
MT4-024/MT4-230 MT8-024/MT8-230 SMALL LINEAR THERMOELECTRIC ACTUATORS Smart-T 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
PAGE 2
MT SMALL LINEAR THERMOELECTRIC ACTUATORS ORDERING INFORMATION Table 1. Actuators order number action* additional features MT4-024-NC normally closed MT4-024-NO normally open MT4-024-NC-2.5M normally closed 2.5 m cable length MT4-024-NO-2.5M normally open MT4-024LC-NC normally closed with low power consumption MT4-024LC-NO normally open MT4-024S-NC normally closed with auxiliary switch MT4-024S-NO normally open MT4-230-NC normally closed MT4-230-NO normally open MT4-230-NC-2.5M normally closed 2.
PAGE 3
MT SMALL LINEAR THERMOELECTRIC ACTUATORS ELECTRICAL SPECIFICATIONS Table 3. Electrical specifications order number initial current* permanent current* power consumption* MTx-024-xx, MTx-024S-xx ~0.7 A < 0.1 A MTx-024LC-xx ~0.2 A < 0.05 A MTx-230-xx, MTx-230S-xx ~0.6 A** 0.014 A MTx-230LC-xx ~0.4 A** 0.010 A *All values at nominal voltage. **Average during first 500 msec. <3W <2W 3W 2W runtime for full nominal valve stroke 4 mm models 8 mm models 4.0 min 6.0 min 6.0 min 7.5 min 2.5 min 3.5 min 3.
PAGE 4
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.
PAGE 5
MT SMALL LINEAR THERMOELECTRIC ACTUATORS Valve Action DIMENSIONS NC (normally-closed) version NC NO (normally-open) version NO NC NO H A B A X B L A AB A B A AB W B AB B A dimension MT4-xxx MT8-xxx W 42 57 65 H 45 L 6 X AB B Fig. 7. Dimensions (in mm) 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.