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0813EN November 2016
Thermo-elecTric acTuaTors
Thermo-elecTric acTuaTors Normally closed
r473, r473m
Main characteristics
• R473 thermo-electric actuators are equipped with a 2-conductors wire to
connect them to ambient thermostats or control units.
• R473M thermo-electric actuators are equipped with a 4-conductors wire for
a stroke-end micro switch to control circulators or zone valves (brown: phase -
blue: neutral- black and grey: micro switch).
Position mechanical indicator
R473 and R473M thermo-electric actuators include a position mechanical
indicator (A) on the top which enables to visually identify the current position
of the actuator and the valve it serves.
The actuator opens the valve when electrically powered.
The position indicator (A) is lifted up when the valve is open.
The position indicator is particularly useful during testing to perform
operation verications without activating the system or disassembling the
actuator.
A
Lifted position indicator =
thermo-electric actuator and
valve it serves open
A
Lowered position indicator =
thermo-electric actuator and
valve it serves closed
Manual locking lever
For an easier installation on valves and/or manifolds, R473 and R473M
thermo-electric actuators feature a red manual locking lever.
Warning.
Once the actuators are installed on the valves and/or manifolds, the
manual locking lever must be pushed in.
B
Thermo-electric actuator with lever
(B) extending from the actuator.
B
After installation,
manually push the lever (B)
inside the actuator.
Description
Thermo-electric actuators installed on distribution manifolds, radiator
thermostatizable valves or fan coil units enable to adequately control the
ambient temperature by combining energy saving to high levels of comfort.
The R473 and R473M thermo-electric actuators feature absolute operational
quietness, a long life as they have no mechanical parts subject to wear and tear
and a proper slowed-down closing system to prevent water hammer eects.
The activation mechanism includes wax bulbs controlled by low-
consumption electrical PTCs.
Versions and product codes
Series Product code Voltage Characteristics
R473
R473X221 230 V
2-conductors wire
R473X222 24 V
R473M
R473MX221 230 V
4-conductors wire,
with stroke-end micro switch
R473MX222 24 V
Technical data
• Complies with EMC and B.T. directive provisions.
• Status without voltage: normally closed (N.C.)
• Rapid connection for Giacomini standard valves and/or manifolds
• Position mechanic indicator
• Linear movement
• Actuator useful stroke: 2,4 mm
• Pollution class: II
• Nominal pulse voltage: 4 kV
• Protection class: IP40
• Protection against direct contacts through double insulation (Class II)
• Power wire: H03 VV-F; useful length 1 m
• Opening and closing time at 20 °C: ~ 6 mins.
• Room temperature of use: -5÷50 °C
• Storage room temperature: -20÷65 °C
• Max. temperature for device installation surface: 90 °C
• PBT self-extinguishing case material V0-UL94
• Normally open micro switch with closed valve (only for versions with stroke-
end micro switch)
R473 R473M
This appliance should not be operated
by children younger than 8 years, people
with reduced physical, sensory or mental
capacities, or inexperienced people who are
not familiar with the product, unless they
are given close supervision or instructions
on how to use it safety and are made aware
by a responsible person of the dangers its
use might entail.
Children must not play with the appliance.
It is the user’s responsibility to clean and
mantain the appliance. Children should
never clean or mantain it unless they are
given supervision.
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