Function
The Caleffi Series 626 water flow switch detects the presence
or absence of flow in piping of heating, air conditioning, cooling
and water treatment systems as well as in pumping and process
systems. In heating systems, the flow switch is normally used to
shut off the burner of the boiler whenever there is no circulation
of the carrier fluid in the boiler circuit. A lack of circulation
can damage critical components and impair the operation of
temperature sensitive safety and protection devices.
This item is designed for use in closed hydronic systems. Do not
use in plumbing applications. This item does not meet the low-lead
plumbing standards of U.S. and Canada.
General Characteristics
A stainless steel bellows separates the electrical and hydronic sections, preventing the possibility
of contact of the fluid with the electrical components. Stainless steel is used in the construction
of many key parts, including the bellows, which protects the switch from corrosion. With a protection
classification of NEMA type 3 (IP54), the switch can be used in particularly humid and dusty
environments. The cover is made of a special non-combustible plastic material. The normally open
and normally closed contacts on the switch enable any electrical device to be switched on or off
as required at the operating flow rate. The operating point can be easily adjusted with the calibration screw.
Technical Characteristics
Connection size:
Maximum operating pressure:
Maximum temperature of the fluid:
Minimum temperature of the fluid:
Maximum ambient temperature:
Suitable for pipes:
Electrical Data
Max. Voltage:
Max. Current:
Electrical connection:
Protection class:
Certification Mark:
1
” NPT male
150 psig (10 bar)
250° F (120° C)
-20° F (-30° C)
130° F (55° C)
1” to 8” (25 to 200mm)
250 VAC
15A
½” NPT threaded with strain relief
NEMA type 3 (IP54)
Uni-Switch™ Universal Flow Switch
© Copyright 2022 Caleffi
68235.07
www.caleffi.com
1
626 Series
