CALEFFI Uni-Switch 626 Series User manual

68235.06
Uni-Switch™ Universal Flow Switch
© Copyright 2022 Caleffi 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 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 5 (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: 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 200mm)
Electrical Data
Max. Voltage: 250 VAC
Max. Current: 15A
Electrical connection: ½” NPT threaded
Protection class: NEMA type 5 (IP54)
Certification Mark:
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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.
WARNING: This product can expose you to chemicals including lead, which is
known to the State of California to cause cancer and birth defects or other
reproductive harm. For more information go to www.P65Warning.ca.gov.
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 Teflon®
pipe joint compounds. Teflon® provides lubricity so that care must be
exercised not to over-tighten joints. Failure to follow these instructions could
result in propert damage and / or personal injury.
CAUTION: Electrical shock hazard. Disconnect ALL power sources when
instaling or servicing this equipment to prevent eletrical shock or equipment
damage. Failure to follow these instructions could result in property damage
and/or personal injury.
Caleffi shall not be liable for damages resulting from stress corrosion, misapplication or misuse of
it products.
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CONSIGNE DE SÉCURITÉ
Ce symbole d'avertissement servira dans ce manuel à attirer l'attention sur la sécurité concernant
instructions. Lorsqu'il est utilisé, ce symbole signifie. ATTENTION! DEVENEZ ALERTE ! VOTRE
SÉCURITÉ EST EN JEU ! NE PAS SUIVRE CES INSTRUCTIONS PEUT PROVOQUER UN RISQUE
DE SECURITE.
AVERTISSEMENT: Ce produit peut vous exposer à des produits chimiques
comme le plomb, qui est connu dans l’État de Californie pour causer le cancer,
dommages à la naissance ou autre. Pour plus d’informations rendez-vous
www.P65Warnings.ca.gov.
AVERTISSEMENT: Tous les travaux doivent être effectués par du personnel
qualifié formé à la bonne application, installation et maintenance des systèmes
conformément aux codes et règlements locaux.
AVERTISSEMENT: Un serrage excessif et une rupture peuvent survenir avec
l'utilisation de Teflon® composés de joint de tuyau. Le Teflon® offre un
pouvoir lubrifiant de sorte que les soins doivent être exercé pour ne pas trop
serrer les joints. Non-respect de ces instructions pourrait entraîner des
dommages matériels et / ou des blessures corporelles.
AVERTISSEMENT: Risque d'électrocution. Appareil sous tension. Coupez
l’alimentation électrique avante d’effectuer toute intervention. Le non respect
de ces indications peut provoquer des lésions corporelles ou des dégâts
matériels.
Caleffi ne pourra etre tenue responsable des dommages resultant de la corrosion, d’une mauvaise
utilisation ou une mauvaise utilisation des produits.
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Installation:
To install the flow switch correctly follow these instructions:
- When selecting the blade, identify the diameter of the
pipe to which the appliance will be fitted;
- The appliance comes pre-fitted with the 1” blade;
- For diameters of 1 1/4” (DN 32) and above, the pre-fitted
blade should be removed and the long blade fitted, cutting
it to the correct corresponding size for the desired
diameter;
- Fit the flow switch to the pipe, carefully observing the
direction of flow indicated by the arrows stamped on the
cover and on the switch mounting plate. When fitted, the
distance between the upper surface of the pipe and upper
surface of the switch mounting plate should be 3 1/8” (80
mm);
-The tee connection in the pipe can be formed by the
direct welding of a threaded socket;
-This also applies to a 1” (DN 25) diameter pipe, as the
blades are designed to be contained in these smaller
dimensions.
-It is however advisable to check that the weld is free from
burrs on the inside so that the blade can move freely in the
tee connection;
-Whenever possible the flow switch should be installed
with control stem in the vertical position to avoid deposits
of impurities which may cause it to function incorrectly.
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Electrical Connections:
Unscrew the four cover screws and lift off the outer cover .
CAUTION: Make sure the wires do not obstruct the
function of the switch mechanism.
AVERTISSEMENT: Assurez-vous que les fils ne sont
pas entraver le fonctionnement de la changer le
mécanisme.
Diagrams showing the internal connections of the micro-switch with:
Flow switch used to activate a device when
flow stops. When the decreasing operating
flow is reached or stops the common (black
wire) and the normally open (red wire)
contacts open, while the common (black wire)
and the normally closed (blue wire) contacts
close.
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.
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Electrical Rating:
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 values or in a counterclockwise direction for lower flow rate values. When the adjustment
has been made lock the screw (A) with the locking ring nut (B). Avoid all contact with the presetting
screw (C) . An incorrect setting would seriously impair the operation of the switch.
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Operating flow rates: gpm (lpm)
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NOTES
06-2022
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