Instructions

ManualsBrandsCaleffi ManualsFlow Switches1" NPT Male Universal Flow Switch

SAFETY INSTRUCTION

This safety alert symbol will be used in this manual to draw attention to safety related

instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT!

YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY

RESULT IN A SAFETY HAZARD.

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 thr 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.

Flow Switch

626 Series

68235.01

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 5 (IP54), the switch can be used in particularly

humid and dusty environments. The cover i

s 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: 1” NPT male

Maximum operating pressure: 150 psig (10 bar)

Maximum temperature of the fluid: 250° F (120°C)

Minimum temperature of the fluid: -20° F (-30°C)

Maximum ambient temperature: 130° F (55°C)

Suitable for pipes: 1” to 8” (25 to 200 mm)

Electrical Data

Max Voltage: 250 VAC

Current: 15 A

Electrical connection: 1/2” NPT threaded

Protection class: NEMA type 5 (IP54)

Certification Mark:

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CALEFFI

Summary of content (4 pages)

PAGE 1
CALEFFI www.caleffi.com 68235.01 Flow Switch © Copyright 2009 Calef fi 626 Series 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 thr boiler whenever there is no circulation of the carrier fluid in the boiler circuit.
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CAUTION: All work must be performed by qualified personnel trained in the proper application, installation, and maintenance of systems in accordance with all applicable codes and ordinances. CAUTION: Over-tightening and breakage can occur with the use of PTFE pipe joint compounds. PTFE provides lubricity so that care must be exercised not to over-tighten joints. Failure to follow these instructions could result in property damage and /or personal injury.
PAGE 3
Electrical Connections Unscrew the four cover screws and lift off the outer cover. Make sure the wires do not obstruct the function of the switch mechanism. Diagrams showing the internal connections of the micro-switch with: Flow switch is used to activate a device when flow starts. When flow starts and the increasing operating flow is reached or exceeded, the common (black wire) and normally open (red wire) contacts are closed, while the common (black wire) and the normally closed (blue wire) are open.
PAGE 4
Calibration The minimum and maximum operating flow rates are given in the table below. Adjustments should be carried out as follows: turn the calibration screw (A) in a clockwise direction for the contacts to close at higher flow rate B values or in a counterclockwise direction for lower flow rate values. When the adjustment has been made lock the screw (A) with the C A locking ring nut (B). Avoid all contact with the presetting screw (C).