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Series
775/775DCDA

Double Check Backflow Preventer
Double Check Detector Assemblies

Sizes: 3" - 8"

• Installation  • Service
• Repair Kits  • Maintenance

LIMITED WARRANTY: Watts Regulator Company warrants each prod-
uct against defects in material and workmanship 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 recondi-
tion the product without charge. This shall constitute the exclusive
remedy for breach of warranty, and the Company shall not be respon-
sible for any incidental or consequential damages, including without
limitation, damages or other costs resulting from labor charges, delays,
vandalism, negligence, fouling caused by foreign material, damage from
adverse water conditions, chemicals, or any other circumstances over
which the Company has no control. This warranty shall be invalidated by
any abuse, misuse, misapplication or improper installation of the
product. THE COMPANY MAKES NO OTHER WARRANTIES EXPRESS
OR IMPLIED EXCEPT AS PROVIDED IN THIS LIMITED WARRANTY.

For field testing procedure, send for IS-TK-DP/DL,
IS-TK-9A, IS-TK-99E and IS-TK-99D.

For other repair kits and service parts, send for
PL-RP-BPD.

For technical assistance, contact your local Watts
representative on back page.

N775/N775DCDA Backflow Preventers are
identical in construction to 775/775DCDA Series
except include short radius elbows between
backflow preventer flange and gate valve flange.

RP/IS-775/775DCDA

IMPORTANT: Inquire with governing authorities
for local installation requirements.

NOTE: For Australia and New Zealand: Pipeline
strainers should be installed between the up-
stream shutoff valve and the inlet of the
backflow preventer.

CALIFORNIA PROPOSITION 65 WARNING

WARNING:  This product contains chemicals
known to the State of California to cause cancer
and birth defects or other reproductive harm.
(Installer:  California law requires that this
warning be given to the consumer.)

Insert lid bolts in holes
provided to remove 1st check

Summary of Contents for 775 Series

Page 1: ...misapplication or improper installation of the product THE COMPANY MAKES NO OTHER WARRANTIES EXPRESS OR IMPLIED EXCEPT AS PROVIDED IN THIS LIMITED WARRANTY For field testing procedure send for IS TK...

Page 2: ...o remove foreign material before installing the unit A strainer should be in stalled as shown ahead of the backflow preventer to prevent discs from unnecessary fouling CAUTION Do not install a straine...

Page 3: ...Up D The downstream shutoff should be closed Open upstream slowly fill the valve and bleed the air through Test cock 2 3 and 4 When valve is filled open the downstream shutoff slowly and fill the wat...

Page 4: ...Check 6 and 8 models only Place yourself so that the water flow through the valve is left to right 1 Shut down water system and lock out system if possible Slowly open all ball valves to relieve air a...

Page 5: ...775DCDA RC1 3 4 3 4 775 775DCDA N775 N775DCDA 0888907 RK 775 775DCDA RC1 6 8 6 8 775 775DCDA N775 N775DCDA Kit includes First Check Assembly O ring and Check Disc Second Check Rubber Parts Kit 088890...

Page 6: ...screwdriver lift the bar up so that the clapper is free to swing up wards away from the seat Figure 8 Using your free hand swing the clapper open until the roller is almost to the free end of the bar...

Page 7: ...urns to PSID No 2 shutoff valve is leaking excessively and must be replaced to test the valve 8 Close all test cocks remove hoses from TC 2 and TC 3 and TC 1 reopen shutoff valve 1 Proceed to Test No...

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