Brochure

Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
© July 2014
We reserve the right to alter designs, specifications and information without notice.
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-ZMC-ES-0714
Electric Operators
ELECTRIC ZONE VALVE ACTUATOR
ZMC - ES Series
1
Macon ZMC - ES
Macon Model ZMC- ES 24V End switch is a
thermoelectric valve drive for opening and clos-
ing 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 Macon ZMC - ES
24V End switch is controlled by a 24 V room
thermostat with two-point output or pulse-width
modulation.
1) Features
• 360º installation position
• Integrated switch with floating contact
• Patented 100% protection against leaky valves
• Available in normally closed (NC)
• Power consumption 1 watt
• Simple snap-on installation
• High functional safety and long expected ser-
vice life
• First-Open function
• Adaptation check on valve
• Alignment aid on the valve
• Compact size, small dimensions
• All round function display
• Noiseless and maintenance-free
2) Function
The actuator mechanism of the Macon ZMC-ES with end switch uses a PTC resistor heated wax element and a compression
spring. The wax element is heated by applying the operating voltage and moves the integrated ram. The force generated by
this movement is transferred on the valve lifter and opens and closes the valve. The integrated micro switch allows the use of
its switching signal depending on the opening of the valve.
2.1 Version NC: Normally Closed (valve closed)
Figure: Example with respect to the travel path of 4 mm.
The characteristic curves of the travel path of 5 mm result
from this.
In case of the normally closed version, the valve is
opened steadily by the ram motion upon switching
on the operating voltage and after expiry of the dead
time. The integrated micro switch is switched with a
travel path of approx. 2 mm.
After the operating voltage is cut and after expiry of
the hold time the valve is closed evenly by the
closing force of the compression spring. The
integrated switch is closed after an actuator travel of
approx. 2 mm.
The closing force of the compression spring is
matched to the closing force of commercially
available valves and keeps the valve closed when
de-energized.