CALEFFI 3048 Series User manual

www.caleffi.com

3048 Series

Dual Check Backflow Preventer

Function

Low lead dual check valve backflow preventer for residential

domestic water supply lines or commercial low-hazard backflow

applications. It prevents reverse flow of unsafe water into main

system water supply. This can occur due to pressure changes in

the distribution network that can force water flow in reverse, or

backwards. The two inline serviceable check valves prevent any

contact between the two systems, closing automatically when

backflow conditions occur. The Caleffi 3048 series is certified to

ASSE 1024 by ICC-ES.

The valve complies with NSF/ANSI/CAN 61 (180°F/82°C Commercial

Hot) as certified by ICC-ES, and complies with NSF/ANSI/CAN 372,

low lead, and codes IPC and UPC or use in accordance with the US

and Canadian plumbing codes, as certified by ICC-ES.

Product range

3048 Series NPT male, NPT female, press, sweat, PEX crimp, PEX expansion pipe sizes 1/2”, 3/4”, 1”

NA10884

Technical specifications

Materials

Body, retaining ring and lock nut: DZR low-lead brass CW724R-M

Check valve: EPDM, PPO

Spring: stainless steel

O-rings: peroxide-cured EPDM

Performance

Max. working pressure: 160 psi (11 bar)

Operating temperature range: 32 to 180°F (0 to 82°C)

Medium: water

Flow rate: see graph

The backflow preventer is ICC-ES certified to ASSE 1024, and complies with NSF/ANSI/CAN 372, low lead laws,

and NSF/ANSI/CAN 61 as certified by ICC-ES. It meets codes IPC, IRC and UPC for use in accordance with the

US and Canadian plumbing codes.

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 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 property damage and / or personal injury.

CAUTION: System fluids under pressure or temperature can be hazardous.

Be sure the pressure has been reduced to zero and the system temperature

is below 100°F (38°C). Failure to follow these instructions could result in

property damage and/or personal injury.

CAUTION: If the device is not installed properly, according to the instructions

contained in this manual, it may not operate correctly and may endanger the

user.

Caleffi shall not be liable for damages resulting from stress corrosion, misapplication or

misuse of its products.

CAUTION: Clean the pipes of any debris, rust, incrustations, welding slag

and any other contaminants. For optimal operation, air in the system must

be removed.

CAUTION: Make sure that all the connecting pipework is water tight.

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.

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.

SAFETY INSTRUCTION

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.

Caleffi ne pourra etre tenue responsable des dommages resultant de la corrosion, d’une

mauvaise utilisation ou une mauvaise utilisation des produits.

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: Les liquides du système sont sous pression ou de la

température peivent être dangereux. Être sûr que la pression a été réduite

à zéro et la température du système est inférieure à 100°F (38°C). Le non-

respect de ces instructions peut entrainer des dommages matériels et/ou des

blessures.

AVERTISSEMENT: Nettoyer les tuyaux de tout debris, roille, incrustations,

scories de soudure et d’autres contaminants.Pour un fonctionnement optimal,

de l’air dans le system doit etre retire.

AVERTISSEMENT: S’assurer que tous les raccordements sont étanches.

CONSIGNE DE SÉCURITÉ

AVERTISSEMENT: Si le valve, n’est pas installe, mis en service et Entretenu

correctement, selon les instructions contenues dans ce manuel, il Peut ne pas

fonctionner correctement et peut mettre en danger l’utilisateur.

DIRECTION

OF FLOW

WATER METER DUAL CHECK

The Caleffi 3048 series dual check backflow preventer is typically installed downstream of a water

meter. A pressure reducing valve (if required) may be installed on either side of the dual check

backflow preventer, all subject to local codes and standards.

The dual check backflow preventer can be installed in either a horizontal or vertical pipe; the

checks are spring loaded and will function independent of orientation. Verify that the flow direction

matches the flow indication arrow on the dual check backflow preventer.

If installing models with sweat tailpiece connectors, always sweat the connectors in place then

install the 3048 union body. Attempting to sweat the fittings with the body in place may damage

the check valves.

For serviceability, always install the 3048 in an accessible location and protect the 3048

from potential freezing conditions. Installing isolation valves is highly recommended to permit

disassembly for servicing.

When installing the dual check backflow preventer, make sure not to over-tighten the connections.

Over time, a material stress failure can occur with subsequent water leakage causing damage.

The 3048 has dual union connections with Posi-Stop o-ring seals which do not require pipe dope

or tape. See graphic on next page.

Typical dual check backflow preventer pit installation:

Installation:

Spring check valves

Posi-Stop™ O-ring seals

3048 series dual check backﬂow preventer section view:

Service, maintenance:

The Caleffi 3048 should be inspected and cleaned, rebuilt or replaced every 5 years. If excessive

pressure drop is experienced in the domestic water supply, dirt or other debris may be causing higher

than normal pressure drop in the dual check backflow preventer. The 3048 can be easily inspected

by removing the body from the dual union connectors. To disassemble the check valves, remove the

sealing brass ring from the downstream side.

Dimensions:

NPT female

sweat

press*

NPT male

PEX crimp

PEX expansion

Code A B C Wt.

(lb/kg)

NPT female threaded connections

304843A 1⁄2" 213⁄16” 51⁄4” 1.2/0.5

304853A 3⁄4” 213⁄16” 5½” 1.6/0.7

NPT male threaded connections

304840A 1⁄2” 213⁄16” 55⁄16” 1.0/0.4

304850A 3⁄4” 213⁄16” 51⁄8” 1.2/0.5

304860A 1” 213⁄16” 513⁄16” 1.6/0.7

Sweat connections

304849A 1⁄2" 213⁄16” 49⁄16” 1.2/0.5

304859A 3⁄4” 213⁄16” 51⁄16” 1.6/0.7

304869A 1” 213⁄16” 513⁄16” 1.6/0.7

*Lay length for press:

size 1/2”: 3 1⁄2inch

size 3/4”: 3 3⁄8inch

size 1”: 3 7⁄8inch

Code A B C Wt.

(lb/kg)

Press connections*

304846A 1⁄2" 213⁄16” 53⁄16” 1.0/0.4

304856A 3⁄4” 213⁄16” 515⁄16” 1.2/0.5

304866A 1” 213⁄16” 57⁄8” 1.4/0.6

PEX crimp connections

304847A 1⁄2” 213⁄16” 67⁄16" 1.0/0.4

304857A 3⁄4” 213⁄16” 67⁄16” 1.2/0.5

304867A 1” 213⁄16” 65⁄8” 1.4/0.6

PEX expansion connections

304848A 1⁄2" 213⁄16” 77⁄16” 1.0/0.4

304858A 3⁄4” 213⁄16” 77⁄16” 1.2/0.5

304868A 1” 213⁄16” 77⁄16” 1.4/0.6

Hydraulic characteristics

0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25 27.5 30 32.5 35 37.5

Flow rate, GPM

psi

0 9.5 28 47 66 85 104 123 142

GPM

LPM

1/2”

3/4”

1”

kPa

110

psi

3048 series 1/2 inch 3/4 inch 1 inch

Cv 8.0 9.5 10.5

Code A B C Wt.

(lb/kg)

Press connections*

304846A 1⁄2" 213⁄16” 53⁄16” 1.0/0.4

304856A 3⁄4” 213⁄16” 515⁄16” 1.2/0.5

304866A 1” 213⁄16” 57⁄8” 1.4/0.6

PEX crimp connections

304847A 1⁄2” 213⁄16” 67⁄16" 1.0/0.4

304857A 3⁄4” 213⁄16” 67⁄16” 1.2/0.5

304867A 1” 213⁄16” 65⁄8” 1.4/0.6

PEX expansion connections

304848A 1⁄2" 213⁄16” 77⁄16” 1.0/0.4

304858A 3⁄4” 213⁄16” 77⁄16” 1.2/0.5

304868A 1” 213⁄16” 77⁄16” 1.4/0.6

0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25 27.5 30 32.5 35 37.5

Safety

If the dual check backflow preventer valve is not installed, commissioned and maintained

properly in accordance with these instructions, it may not operate correctly, and may cause

damage to objects and/or people. Make sure all the connections are watertight.

Caleffi North America, Inc.

3883 West Milwaukee Road

Milwaukee, WI 53208

T: 414.238.2360 F: 414.238.2366

04-2023

NOTES

For Technical Support call 1-414-338-6338, or

email techsupport.us@calef.com

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