|
INSTALLATION INSTRUCTIONS
<br /> � ��,Bf,'� MODEL 825Y (3/4" - 2 ")
<br /> V Reduced Pressure Backflow Preventer
<br /> assemby to avad damage to the system or the assembly
<br /> ,! ,�.� caused by system pressure. In addition, protectior, must be
<br /> provided against therma! water expansion, extreme
<br /> �.,.
<br /> ` backpressure and water hammer.
<br /> �.• : �,;:, �, 7. The ReduCed Pressure Backflow preventer is subjaCt to
<br /> damage 'rf the irrternal water is aliowed to freeze. The unit
<br /> � � � �a � " must be protected from freezing by using methods such as a
<br /> � ' °' heated enclosure, insulation using heat tape, draining, or
<br /> � . other suftable means. However, the unit must always be
<br /> ��,�`' � acesssibte for testing and maintenance. For more
<br /> information on freeze protection procedures, contact Febco
<br /> --���.»��ma,��,�<„�.�,��,�
<br /> tor the Freezs Protection Service Instruction Shset.
<br /> �� ♦AFPLICATION� 8. Most field problems occur bscause dirt or debris is
<br /> ��` ��� ' ` ��� ��` "��`� "``����`� � present in the system at the time of installation and becomes
<br /> The Febco tvtcdel 825Y Reduced Pressure Assembfy is trappesi in the first check seating area resutting in a
<br /> designed to prevent backflow of contaminated water into the corttinuous discharge from the relief va!ve during a static or
<br /> patable water system due to backpressure and backflow condition. THE SYSTEM SHOU!D BE FLUSHED
<br /> backsiphor.age. The Reduced Pressure Assambly is gEFORE THE ASSEMBLY IS fNSTALLED. However, to
<br /> acceptable for use in instatlations where the possible ef�ectively flush the assemb{y after it has been instaifed,
<br /> cor�taminating mat6rial may be toxic or hazardous to health. remove both checks and open the inlet shut-off and alfow
<br /> Consuft focal codes before instalfing any backf{ow prevention water to flow for a sufficient time to flush debris from the iine
<br /> assembfy. Typical installations include services to industrial a�d assembiy. If debris in the water system continues to
<br /> pfants, hospitals, morgues, mortuaries, and chemical plants. cause problems, a strainer can be instatied up-stream of the
<br /> They a�e also used in irrigation systems, boiler feed water �mbly.
<br /> frnes and other installations requiring rnaximum protection.
<br /> bIME�1T$IDN3 AND WEI4HT'S'► (U.B. . �31iCHS5}
<br /> z...,. _�+'S!sgp_. . ... . . .
<br /> °� iINSTAI.LATI011T 1 _," size a� A*�� � B � c � D � E I��Les�
<br /> 1. The assembfy should be instalfed in a horizontaf position __3i+ _??_�i4_�„_,«_; � 3E4 � ,ie � 3 +i. I . sre „ ,r2
<br /> t t --t-------------
<br /> 1 t3 S/8 � S} S/8 7 3!1 f 1/B 3 1!1 4 7/& 12 1/2
<br /> with the re{ief vafve on the side. There should Ge a minimum -----j------}---_-�------t_____I_---_-
<br /> ---- -----
<br /> of 12" between the relief vaive discharge port and floor or '_'C'_ _'_'__'��_�'?_�!_�?_�' �_'_'!B_j_3 ,ia , 4 �i8 „
<br /> 1 1/2 18 1/4 � 1S 1!1 ' tp S(8 ! 5 1/4 � 4 1!2 i-S-----28 1/2
<br /> grade, andaminimumafl8"horizor�talclearancearoundthe ____ _____� ____,______�____r _ ____________
<br /> unit for access and ease of testing and maintenance of the z �e C,s ,iz ,o vg � s �i, � , ,n T s as
<br /> relief vafve, Local codes may not alfow this assembly to be -- - _
<br /> instalfed in a vertical position. Check local cocies. �Il►'51�138IQNs AND WEIGHTS• (Metrfc - mm.)'
<br /> Size � A* ' B ' C j p i E �n k wr.
<br /> 2. Approval agencies typically do not recommend ev cv ; ; ,
<br /> installation ot a Reduced Pressure Assembly in a pit. � 3,,.2 I z8s.e ,oee ' ,w.e ' az.e ! ,ae s.z
<br /> Flooding of the pit can result in cross connection --� -�., - �.3 f ,�.e ,a.e a2.e � io4.s a.�
<br /> contamination. If locaf cades ermit installation of a so x�c � �---t----�-�------ �
<br /> ------
<br /> ---- --------
<br /> p __ , zoe.5 i aee.e , �o,.e nz.e ,o.s ; e.,
<br /> --1--=-
<br /> Reduced Pressure Assembl in a it, ade uate draina e .o .e3.t � ��.a fi iec e ? i�.. is..3 � ,z�.c ,z.o
<br /> -- -- --�- ----
<br /> Y P q 9 ----�-----+---=-- i----- --
<br /> must be provided to preverrt the pit from flooding under so ' saz e � 3B3J ' 289.8 } 733.1 t ;,;.s j ,2�.o ia.o
<br /> maximum discharge conditions. �• BV is approximat�I�ngth with Ba��V�Iw Shut-Offs.
<br /> A• GV la approxlmat�I��gth with Gat�VaM Shut-Otfs.
<br /> 3. The assembty should be placed where water discharge All direNnslon�ar�approzlmat�.
<br /> from the relief port will not be objectionable.
<br /> A
<br /> 4. To be approved by the University of Southern California �—e--,
<br /> Foundation tor Cross-Connection Control and Hydraulic �
<br /> Research (USC FFCCC & HR), the assembiy must be � �� �
<br /> purchased and installed with resilient seated shut-offs to sa. ,
<br /> insure bubble tight closure for more consistent results during �`""' � ; � i ,�
<br /> testing. CAUTION: Open and Gose resilient seated shut-offs � ' �
<br />, slowly to prevent weter hammer damage to the system and/or
<br /> assembly. 'S�
<br /> 5. The Febco Reduced Pressure Assembly is designed to be
<br /> serviced while in tine.Straight union connections between the
<br /> shut-ofl vaNes are not recommended since the unit should �
<br /> not be removed from the system during servicing. �w
<br /> B. lnsure that the supply water pressure does not exceed the L_., r�( �
<br /> manufacturer's maximum water pressure rating ot the
<br />
|