FEBCO 765 Pressure Vacuum Breaker Instructions

FEBCO 765 Pressure Vacuum Breaker Instructions

An addon connection kit is required to activate the freeze sensor. Without the connection kit, the sensor is a passive component that has no communication with any other device. (The kit can also be used to retrofit existing installations. For ordering details, see “Add on/Retrofit Sensor Connection Kit.”
Use of the freeze sensor and activation kit with FZ models does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of the PVB assembly. Watts® is not responsible for the failure of alerts due to connectivity or power issues.

FEBCO Series 765 Pressure Vacuum Breakers are used to protect against health hazard and nonhealthy hazard backsiphonage conditions in industrial plants, cooling towers laboratories, laundries, swimming pools, and lawn sprinkler systems.
Series 765 includes a freeze sensor to indicate when temperature nears the freezing point. The sensor relays a signal to building/irrigation management systems when temperature crosses the preset threshold. Freeze alerts are distributed according to BMS/IMS applications, helping facility personnel take action to reduce or eliminate PVB replacement or repair.

Installation Guidelines

• Consult local codes for requirements and restrictions applicable to the area. FEBCO recommends at least 20 psi (138 kPa) for system supply pressure.
• Install the valve only in the orientation/flow direction shown. The air inlet operates in the vertical position. Installation in any other manner causes the device to malfunction.
• Install the valve where it is accessible for periodic testing, maintenance, and repair. The clearances recommended apply to exterior and interior installations. (See Figures 1 and 2.) These minimums do not apply to removable protective enclosures. Refer to local codes for requirements in the area.
• Before installing the valve into the supply line, flush the line of all foreign material.

Failure to flush the line may cause the check valves to become fouled and require disassembly for cleaning. Install the device where spillage is not objectionable, as instantaneous siphon conditions and pressure surges can cause spitting.

• When threading the assembly in line, place the wrench only on the ball valve hex ends. Keep pipe dope (sealant) off the interior surfaces of the valve. After installation, fill the assembly with water and test the device to ensure proper operation. Open the inlet ball valve to pressurize the unit. Slowly open the outlet ball valve to fill the downstream line.

Maintain the downstream pressure above 5 psi (34 kPa) to keep the spring- loaded air inlet poppet closed. If the check valve fails to hold 10 psi minimum, it has become fouled and must be cleaned. Close both ball valves and bleed pressure from the device before disassembly. (For more information, see “Service Procedure.”)
All assemblies are tested at the factory for proper operation and leakage. If the valve does not pass the field test, it may contain a fouled check valve. This condition is not covered by the factory warranty. Remove the valve cover then inspect and clean the check seats. Any damage or improper operation caused by pipeline debris or improper installation/start-up is not included in the factory warranty. In case of a warranty claim, contact the local supplier or FEBCO representative. Do not remove the assembly from the pipeline.

• Protect the assembly from freezing and excessive pressure increases. Pressure increases can be caused by thermal expansion or water hammer. Eliminate excessive pressure situations to protect the valve and system from possible damage. Use the plastic test cock plugs and tethers included in the packaging, if required. For information on freeze protection, download ISF765Winterization.

Field Testing Procedure

FEBCO recommends the use of the appropriate test method presented in the ASSE Series 5000 manual that is consistent with the local codes.
Before starting the procedure, remove the freeze sensor mounting clip from the test cock and set it aside to avoid damage. After the procedure is finished, reattach the clip on either test cock.
Equipment Required
Sight Tube Test Kit (1″ clear plastic Sight Tube about 40″ long with appropriate fittings to attach to test cocks of vacuum breaker)
Purpose of Test
To test the air inlet and the check valves for proper performance.
Test Air Inlet
The air inlet must be tested to verify opening above 1 psi. (For visual aid information, see Figure 3.)

1. Remove the canopy from the top of the vacuum breaker to expose the air inlet.
2. Install the sight tube at test cock No. 2.
3. Close ball valve B on the discharge side of the vacuum breaker.
4. Open test cock No. 2, fill the tube to about 30″ above the poppet, then close the test cock.
5. Close ball valve A on the inlet side of the vacuum breaker.
6. Slowly open test cock No. 2 while watching the poppet in the air inlet. The poppet must unseat. If the air inlet does not open, it is sticking and must be repaired.
7. Close test cock No. 2 and remove the sight tube.

Test Check Valve
The check valve must be tested to hold against 1 psi in the direction of flow.

1. Install the sight tube at test cock No. 1.
2. Open ball valve A to allow the unit to refill with water.
3. Open test cock No. 1 and allow the sight tube to fill about 30″ above the top of the unit, then close the test cock.
4. Close ball valve A. (Ball valve B should already be closed.)
5. Open test cock No. 1.
6. Open test cock No. 2. Water may run from test cock No. 2 initially, but should stop after a short time. The level of water in the sight tube may drop a little, but should not drop below 28″ above the check valve. (Centreline of the discharge ball valve.) If the level in the sight tube continues to drop and water continues to run out of test cock No. 2, the check valve is leaking and must be repaired.
7. Close test cocks No. 1 and No. 2.

Restore Operation
Restore all valves and test cocks to the original positions and replace the canopy.

Service Procedure

The general service instructions apply to all sizes. (For visual aid information, see “Parts.”) Before starting the procedure, remove the freeze sensor mounting clip from the test cock and set aside to avoid damage. After the procedure is finished, reattach the clip on either test cock.

• Rinse all parts with clean water before assembly.
• DO NOT USE ANY PIPE DOPE, OIL, GREASE, OR SOLVENT ON ANY PARTS unless instructed to do so.
• Do not force the parts into place. The parts should fit freely together. Excess force may cause damage and render the device inoperable.
• Carefully inspect seals, seating surfaces, and other areas for damage or debris.
• Test the unit after servicing to ensure proper operation.
• Tighten the canopy nut only until it cannot turn freely.
• Rapidly open the inlet ball valve to minimize spillage through the air vent.
• Slowly open the outlet ball valve.
• Test the unit to ensure proper operation.
• Test the unit after servicing to ensure proper operation.

Sizes 1/2″ to 1¼”

1. Disassemble the bonnet/poppet.
   a. Close the outlet ball valve then close the inlet ball valve. Bleed the residual pressure by opening test cock No. 2.
   b. Remove the canopy nut and the canopy.
   c. Unscrew the bonnet assembly from the valve body by hand. (If necessary, use an appropriate sized wrench on the outside diameter of the bonnet. However, this may cause damage and require replacement of the bonnet assembly.)
   d. Remove the poppet/seal assembly from the body.

2. Remove the check valve.
   a. Evenly depress the retaining bracket approximately 1/4″, and rotate the bracket 90 degrees.
   b. Remove the bracket and the spring and check assembly.

3. Replace the check valve seal.
   a. Remove the screw holding the guide, and lift the seal from its holder.
   Do not damage the guide legs or the guide pin of the holder.
   b. Insert the seal disc into the holder, position the guide in the center of the seal, and thread the retaining screw through the guide into the holder.
   c. Lightly tighten the screw to hold the guide from rotation.
   Overtightening may cause distortion of the guide legs.

4. Reassemble the device by reversing the preceding steps and using the following special instructions.
   a. Position the check assembly into the valve body. Position the spring into the recessed area on the top side of the check assembly.
   In some cases it may be easier to position the spring on the check assembly before positioning it in the valve body.
   b. When installing the retaining bracket, ensure the spring is cantered on the base of the bracket.
   c. Roll the rubber disc into the recess on the poppet and position the poppet assembly in the valve body.
   d. To ease assembly of the bonnet into the valve body, apply a thin coating of petroleum jelly on the Oring. DO NOT USE ANY OTHER LUBRICANT.
   e. Ensure the guide pin of the bonnet correctly enters the hole in the poppet.
   f. Thread the bonnet into the valve body by hand until the bonnet flange bottoms on the top surface of the valve body. DO NOT OVERTIGHTEN.
   g. Tighten the canopy nut only until the canopy cannot turn freely.
   h. Rapidly open the inlet ball valve to minimize spillage through the air vent, then slowly open the outlet ball valve.

Sizes 11/2″ to 2″

1. Disassemble the unit.
   a. Close the outlet ball valve then close the inlet ball valve. Bleed the residual pressure by opening test cock No. 2.
   b. Remove the six bonnet bolts, lift the bonnet from the valve body, then remove the poppet and the seat disc.
   c. To replace poppet spring, unscrew the nut and the guide pin and remove the spring. Use caution to avoid damage to the guide pin. Install a new spring and reassemble.
   d. Remove the spring retaining the web and the spring and check assembly.

2. Replace the valve seal.
   a. Remove the guide retaining the nut and guide, then lift the seal from the holder.
   b. Insert a new seal, position the guide in the center of the holder/seal, and thread the nut to retain the guide. Lightly tighten the nut to keep the guide from rotating.

3. Reassemble the unit.
   a. Position the check valve assembly, spring, and retaining web in the valve body. Ensure the arms of the retaining web are aligned with the guide and supports in the valve body.
   b. Roll the rubber disc into the recess on the poppet and position the poppet assembly in the retaining web. Place the bonnet on the valve body. Ensure the retaining web is properly supported by the three case bosses inside the bonnet.
   c. Insert the bonnet bolts and tighten.
   d. Rapidly open the inlet ball valve to minimize spillage in the air vent, then slowly open the outlet ball valve.
   e. Test the unit to ensure proper operation.

Parts

Troubleshooting

Addon/Retrofit Sensor Connection Kit

Limited Warranty: FEBCO (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge. THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product. Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.

USA: T: (800) 7671234 · FEBCOonline.com Canada: T: (888) 2088927 · FEBCOonline.ca Latin America: T: (52) 5541220138 · FEBCOonline.com
© 2023 Watts

References

• FEBCO | Watts Brands
• FEBCO | Watts Brands
• Watts | Plumbing, Heating and Water Quality Solutions

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>