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Tunstall Corporation

118 Exchange Street • Chicopee, MA 01013

We reserve the right to alter designs, specifications and information without notice.

Phone (413) 594-8695 · Fax (413) 598-8109

www.tunstall-inc.com • www.maconcontrols.com

Bulletin-MTWZ-T1-T4-0714

Non-Electric Operators

THERMOSTATIC OPERATOR

DIRECT MOUNT w/REMOTE SENSOR

MTWZ (Models T1-T4)

Operation

The sensor is wax-filled and the wax volume varies according to ambient temperature. The volume

changes are transmitted to the valve stem via a liquid capillary system. The valve body has a return

spring which closes the valve when the stem is under low pressure. When the force from the sensor and

the return spring are balanced to the room temperature selected, the valve disc stops in that position to

allow a certain amount of water or steam to flow through the valve. Temperature changes cause the

valve disc to change position and thereby continuously modulate the flow so that the room temperature

is maintained at the desired temperature. The unit is secured against damage from over pressure by a

pressure absorbing spring.

Features

 Valve-mounted setting knob and remote tem-

perature sensor

 Brass sensor, High sensitivity

 Fiberglass valve plug shaft

 Stainless steel capillary tube, 6’6” standard

length

 Longer capillary available, consult factory

 Fits all Macon NT series valves

 Replaces the valve-mounted sensors on built-

in convectors, etc., and where the valve-

mounted sensor is exposed to draft from

doors and windows

 Fully automatic - nonelectric, no wiring

 Manufactured to exacting standards using ex-

ceptionally high quality materials

 Each sensor is tested and re-checked to

achieve exact settings before leaving the fac-

tory

 Note that changing of the actuator can be ac-

complished without draining of the system

 All Macon thermostats can be locked at or

limited to a specific temperature or tempera-

ture range

 Simple one-trade installation

 Sensor guard furnished at no extra cost

 All Macon valves and thermostats conform to

ASHRAE Standard 102P-1983 and European

Standard EN 215/1215. We are also ISO 9001

certified (1994) and ISO 14001 certified

(1998).

See reverse for

min/max field adjustment

(MTWZ shown with

Macon NT series valve)