Brochure

ManualsBrandsCaleffi ManualsFlow Switches1" NPT Male Universal Flow Switch

01052/09 NA

Flow switch

series 626

Function

The flow switch detects whether there is any flow in the pipe and

opens or closes an electrical contact. It is normally used in heating,

air-conditioning, refrigeration, water treatment, additive pumping

and process systems in general. By means of the flow switch it is

possible: to control devices such as pumps, burners, compressors,

refrigerators,

motorized valves; to turn on indicator and alarm

devices and regulate equipment for dosing water additives.

In heating s

ystems, especially, the flow switch functions to switch

the burner off in case of a lack of medium circulation within the

water heater circuit. A lack of circulation would otherwise impair

the operation of the temperature-sensitive safety and protection

devices.

Product range

Code 626600A Flow switch Size 1” NPT

Code 626009 Replacement paddles (blades)

CALEFFI

Technical specifications

Materials

Body: brass

Cover: self-extinguishing polycarbonate

Microswitch protection casing: self-extinguishing polycarbonate

Bellows rod and bellows: stainless steel

Paddle (Blades) for pipes: stainless steel

Microswitch spring: stainless steel

O-Ring seals: EPDM

Performance

Medium: drinking water and glycol solutions

Max. percentage of glycol: 50%

Max. working pressure: 150 psi (10 bar)

Medium temperature range: -20–250°F (-30

–

120°C)

Max. ambient temperature: 130°F (55°C)

Connection: 1” NPT male

Pipe adjustability: from 1” to 8”

Electric specifications

Voltage: 250 V

Electrical connection: 1/2" FNPT threaded

Current: 15 (5) A

Protection class: NEMA Type 5 (IP 54 )

Certification: CE, C-UL

Dimensions

5/16”

7/16”

2 15/16”

2 3/8”

Code

626600A

Weight (lb)

2.05

30V9

C US

ACCREDITED

ISO 9001 No. 0003

ISO 9001 FM 21654

Summary of content (4 pages)

PAGE 1
Flow switch CALEFFI series 626 01052/09 NA ACCREDITED ISO 9001 FM 21654 ISO 9001 No. 0003 Function The flow switch detects whether there is any flow in the pipe and opens or closes an electrical contact. It is normally used in heating, air-conditioning, refrigeration, water treatment, additive pumping and process systems in general.
PAGE 2
Operating principle Construction details The flow switch is composed of a paddle (blade) (1) integral with a control rod (2) connected, at the top, to an adjustable counter spring (3). The assembly, by rotating around a pin under the action of the water flow, operates a microswitch contained in a protective casing (4). At rest, the counter spring keeps the microswitch contact open.
PAGE 3
Reference standards Flow rate adjustment In heating systems with a closed expansion tank, where circulation is ensured by motor pumps, the flow switch is used to stop the heat supply to the generator when the pumps stop and there is no circulation. The minimum and maximum operating flow rates are given in the table below.
PAGE 4
Application diagrams Example of using the flow switch in a plumbing system In systems for instantaneous hot water production with heat exchangers, the flow switch has the job of governing the pump and enabling water circulation in the exchanger primary circuit when required by the user.