Watts 994RPDA - Manual

S-TSG 1329 © 2013 Watts
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca A Watts Water Technologies Company
Problem Cause Should valve
be replaced?
Solution
A. Valve spits periodically
from the vent.
A.1 Fluctuating supply pressure. No A.1 Install a spring-loaded, soft seated check
valve immediately upstream of the device.
A.2 Fluctuating downstream
pressure.
No A.2 Install a spring-loaded, soft seated check
valve downstream of the device as close
as possible to the shutoff valve.
B. Valve drips continually
from the vent.
B.1 Fouled first check. No B.1 Flush valve. If flushing does not resolve
problem, disassemble valve and clean or
replace the first check.
B.2 Damaged or fouled relief valve
seat.
No B.2 Clean or replace the relief valve seat.
B.3 Relief valve piston “O” ring not
free to move due to pipe scale,
dirt or build-up of mineral
deposits.
No B.3 Clean, grease or replace the piston “O”
ring
B.4 Excessive backpressure, freez-
ing, or water hammer has dis-
torted the second check.
No B.4 Eliminate source of excessive backpres-
sure or water hammer in the system
downstream of the device. Use Watts No.
601 to dampen out backpressure and No.
15M2 to eliminate water hammer. Replace
defective second check assembly. In
case of freezing; thaw, disassemble, and
inspect internal components.
Replace as necessary.
B.5 Electrolysis of relief valve seat
or first check seats.
No B.5 Replace relief valve seat or inlet cover.
Install dielectric unions (Watts Series 3001
through 3006). Electrically ground the
piping system and/or electrically isolate
the device with plastic pipe immediately
upstream and downstream of the device.
B.6 Valve improperly reassembled. No B.6 If valve is diassembled during installation,
caution must be exercised to install check
springs in their proper location.
C. Valve exhibits high
pressure drop.
C.1 Fouled strainer. No C.1 Clean strainer element or replace.
C.2 Valve too small for flows
encountered.
Yes C.2 Install proper size device based upon flow
requirements.
D. No water flows
downstream of valve.
D. Valve installed backwards. No D. Install valve in accordance with flow
direction arrow.
E. Valve does not test
properly.
E.1 Follow manufacturer's test pro-
cedure.
No E.1, E.2 Clean or replace gate valve with full
port ball valves or resilient wedge
shutoff valves.
E.2 Leaky downstream gate valve. No
F. Valve quickly and
repeatedly fouls
following servicing.
F. Debris in pipe line is too fine to
be trapped by strainer.
No F. Install finer mesh strainer element in the
strainer.
G. Winterization of back-
flow preventers.
G. Prevent freeze damage by enclosing in a
WATTSBOX heated enclosure. For addi-
tional information, reference ES-WB or
ES-WB-T.
Troubleshooting Guide
Reduced Pressure Backflow Preventers
S-TSG