Watts AMES Deringer 20G User manual

Installation, Operation and
Maintenance Manual
IOM-A-Deringer 20G/20GX/30G/30GX_6-8
Deringer™20G/20GX/30G/30GX
Double Check Valve/Double
Check Detector Assemblies
Size: 20G/30G: 6"&8"
20GX/30GX: 4"&6"
WARNING
!
Read this manual BEFORE using this equipment.
Failure to read and follow all safety and use information can
result in death, serious personal injury, property damage, or
damage to the equipment.
Keep this manual for future reference.
You are required to consult the local building and plumbing
codes prior to installation. If the information in this manual
is not consistent with local building or plumbing codes,
the local codes should be followed. Inquire with governing
authorities for additional local requirements.
WARNING
!
This list is the recommended tools for installation. Other
versions of the same tool can be used. For example, allen
wrenches instead of allen drive sockets.
Tools Required
15/16" Socket
11/8" Socket
Wood Block 2" x 4" x 5"
Wood Block 1" x 2" x 16"
#2 Phillips Head Screwdriver #2 Flathead Screwdriver Ratchet
Adjustable Wrench Deringer Test Cock Wrench Slip-joint Pliers

2IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2005 EDP#2916000 © 2020 Watts
Closing Shutoff Valves Prior to Maintenance
1. Slowly rotate shutoff valve #2 handle (A) clockwise
to the closed position.
2. Slowly rotate shutoff valve #1 handle (C) clockwise
to the closed position.
NOTICE
When the threaded portion of the OS&Y stems are fully exposed above the
handwheel the shutoff valves are in the open position. Before doing any
maintenance be sure to turn the handwheel towards the closed position until
the threaded portion of the OS&Y stems have receded down into the bonnet
indicating the shutoff valves are in the closed position (See diagram to right).
FLOW
A
C
FLOW
ClosedOpen
OS&Y valves in closed position
OS&Y valves in open position
Opening Test Cocks and Bleeding All Pressure
from the Line Before Maintenance
NOTE: valve is still under pressure. When opening test cocks,
water will be released. Take precautions to ensure discharging
water does not damage the surrounding area/equipment or
create an unsafe condition.
1. DO NOT OPEN Main test cock number 1, as it is still
subject to line pressure.
2. Using the DeringerTM test cock wrench or a small
adjustable wrench open (A) main test cock number 4.
(Test cock is open when wrench flats are parallel to water
flow through test cock)
3. Deringer 30G/30GX only: Using a #2 flathead screwdriver
open bypass test cock number 2. (Test cock is open when
screwdriver slot is
parallel to water flow through test cock (B)
4. Using the Deringer test cock wrench or a small adjustable
wrench open main test cock number 3.
5. Deringer 30G/30GX only: Using a #2 flathead screwdriver
open bypass test cock number 1.
6. Using the Deringer test cock
wrench or a small adjustable
wrench open main
test cock number 2.
FLOW
BB
AA
Bypass Test CockMain Test Cock
Closed Open Closed Open

3
IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2005 EDP#2916000 © 2020 Watts
Removing Access Port Cover Plate
C
D
Removing the First Dual-actionTM Check Module
FLOW
C
A
A
Removing the Second Dual-action Check Module
A
Deringer 30G/30GX:
Disassembly and Maintenance of Bypass Check Valve
A
C
B
A
1. Using a 15/16" socket wrench loosen all eight
bolts on the access port cover plate (A).
2 Remove bolts and tapered washers (B) and
store in a safe place. Be careful not to lose
tapered washers as the access cover will not
seal properly without the tapered washers.
3. Remove access port cover plate (C). Do
not remove access port O-ring (D).
B
1. Use a 15/16" socket wrench to loosen the check retainer
bolts on both sides of the valve body (A). Do not com-
pletely remove check retainer bolts from valve body.
Loosen the bolts until the ends of the bolts are flush
with the inner wall of the valve body (B).
2 Insert a flathead screwdriver between the inner valve
body and the first check module flange (C), gently push
the first check module in the downstream direction until
the first check module can easily be removed from the
access port by hand.
A
A
1. Use a 11/8" socket wrench to loosen the check
retainer bolts on each side of the valve body (A). Do
not completely remove check retainer bolts from valve
body. Loosen the bolts until the ends of the bolts are
flush with the inner wall of the valve body (B).
2. Insert a flathead screwdriver between the inner valve
body and the second check module flange (C), gently
push the second check module in the upstream
direction until the second check module can easily
be removed from the access port by hand.
FLOW
C
B
D
Part 1
1. Use an adjustable wrench to rotate check cover (A)
counterclockwise to remove.
2. Examine cover plate O-ring (B) for damage or fouling.
3. Remove spring (C).
4. Remove check poppet assembly (D) and examine for damage
or fouling.
5. Examine seat cage, located inside the bypass check valve body,
for damage or fouling to the sealing seat. Do not remove unless the
seat cage is being replaced.
6. Reverse the order of above instructions to reassemble bypass
check valve.
A
B

4IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2005 EDP#2916000 © 2020 Watts
Maintenance of First Dual-action Check Module
1. Use a #2 phillips head screwdriver to remove tower screws
(A) from the first check seat (B). The double torsion spring
(C) is captured and does not need to be retained during
maintenance.
2. After removing the tower screws (A) examine the elastomer
disk (D) and check seat (E) for fouling or damage.
3 Should elastomer disk (D) need replacement unscrew disk
retainer screws (F) and remove disk retainer (G). Carefully
remove and replace elastomer disk (D). When replacing
elastomer disk (D) be certain that no air, water or debris is
trapped in the clapper (H) cavity behind the elastomer disk (D).
4. Reverse the order of the above instructions to reassemble
check.
• Elastomer disk must be flat in clapper (H) cavity before
tightening disk retainer screws (F).
• Do not cross thread disk retaining screws (F).
F
G
E
D
D
A
H
B
C
Part 2
1. To replace a damaged red silicone poppet disk, use a #2
phillips head screwdriver to remove the disk retaining screw (A).
2. Remove disk retaining washer (B).
3. Use a flathead screwdriver to remove the gasket from
poppet cavity (C).
4. Install new red silicone poppet disk (D).
5. Reverse the order of the above instructions to reassemble
check poppet assembly.
6. Reverse the order of the instructions on the previous page
to reassemble bypass check assembly.
Deringer 30G/30GX: Removing Bypass Meter
1. Using the ball valve handles, close the #2 bypass ball valve (B)
and then #1 bypass ball valve (A). (Ball valve is closed when
“T” handle is perpendicular to water flow through ball valve).
2. Using a #2 flat head screwdriver open bypass test cock #2
(D) and then open bypass test cock #1 (C). (Test cock is
open when screw driver slot is parallel to water flow through
test cock).
3. Using large adjustable pliers or a wrench, unscrew and
retract bypass meter coupling nuts (E). Remove the gaskets
(F) on both sides of bypass meter.
4. Gently remove bypass meter (G) from line. It is OK if the
bypass fittings move slightly during the removal process.
5. Reverse order of above instructions to reinstall bypass
meter. Remember to install gaskets (F) before threading
meter coupling nuts into place. FLOW
A
B
D
C
E
E
GF
A
AC
B
D
E
Disassembly and Maintenance of Bypass Check Valve (continued)

5
IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2005 EDP#2916000 © 2020 Watts
Maintenance of First Dual-action Check Module (continued)
NOTICE
Maintenance of Second Dual-action Check Module
1. Use a #2 phillips head screwdriver to remove tower screws
(A) from the second check seat (B). The double torsion
spring (C) is captured and does not need to be retained
during maintenance.
2. After removing the tower screws (A) examine the elastomer
disk (D) and check seat (E) for fouling or damage.
3. Should elastomer disk (D) need replacement unscrew disk
retainer screws (F) and remove disk retainer (G). Carefully
remove and replace elastomer disk (D). When replacing
elastomer disk (D) be certain that no air, water or debris is
trapped in the clapper (H) cavity behind the elastomer disk (D).
4. Reverse the order of the above instructions to reassemble check.
• Elastomer disk must be flat in clapper (H) cavity before
tightening disk retainer screws (F).
• Do not cross thread disk retaining screws (F).
F
G
D
H
B
CA
E
D
Maintenance of Second Dual-action Check Module
NOTICE
First Check Tower Bosses and Spring Arms Face Up
Orient seat protrusions as shown
Tower Bosses
Spring Arms
The diagram on the right shows the correct orientation of the
first dual-action check module when being re-attached to the
seat. In order to maintain the performance of the valve pay
attention to the proper orientation of the check module.
Second Check Tower Bosses and Spring Arms Face Down
Orient seat protrusions as shown
Tower Bosses
Spring Arms
The diagram on the right shows the correct orientation of the
second dual-action check module when being re-attached to
the seat. In order to maintain the performance of the valve pay
attention to the proper orientation of the check module.

6IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2005 EDP#2916000 © 2020 Watts
Installing Second Dual-action Check Module
1. Insert second check module (A) into access port (B) with second
check towers (C) pointing downstream. Push second check module
(A) downstream into valve sealing ring (D) until check O-ring (E) rests
against valve sealing ring (D). Push second check module (A) into its
fully seated position by hand.
2. Alternatively place 2"x4" piece of wood cut to 5" length (F) against
the backside of the second check seat ring (G). Using a 1"x4" piece
of wood cut to 16" length (H) as a lever between access port wall
the 2"x4" (F) gently coax the second check module (A) into its fully
seated position.
3. Be certain second check module (A) is fully seated and check O-ring
(E) is NOT “fish mouthed” or damaged.
4. Tighten the second check retaining screws (I) ONLY AFTER the
first check module as been installed.
The second check module must be fully seated to ensure
retainer screws do not bind against check seat. Binding
retainer screws against check seat will result in permanent
damage to second check modules.
WARNING
!
FLOW
C
E
A
B
Not BindingBinding
I
Installing First Dual-action Check Module
1. Insert first check module (A) into access port (B) with first
check towers (C) pointing downstream. Push first check
module (A) upstream into valve sealing ring (D) until check
O-ring (E) is resting against valve sealing ring (D). Without
using excessive force, push first check module (A) into its
fully seated position by hand.
2. Alternatively, using a piece of 1"x4" wood cut to 16" length
(F) as a lever between the second check seat (G) and the
first check towers (C), push the first check module (A) into
its fully seated position.
3. Be certain first check module (A) is fully seated and check
O-ring (E) is NOT “fish mouthed” or damaged.
4. Now fully tighten the first and second check retaining screws (I).
The first check module must be fully seated to ensure
retainer screws do not bind against check towers. Binding
retainer screws against check towers will result in permanent
damage to first check modules.
WARNING
!
FLOW
Not BindingBinding
C
A
B
E
F
G
D
I
G
H
F
D

7
IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2005 EDP#2916000 © 2020 Watts
Installing Access Port Cover
1. It is best to never remove the access port O-ring (A). Should the access port
O-ring (A) become dislodged, simply insert it back into access port groove (B).
2. Slide the access port cover (C) into place being certain that access port O-ring
(A) does not become dislodged during the process.
3 Insert tapered washers (E), flat side facing up, and cover bolts (D) into tapered
cover holes (F). Tapered washers (E) must be properly installed or the access
port cover (C) will not seal under pressure.
4. Use 15/16" socket wrench (G) to tighten the 4center cover bolts (D) alternating from
one side of the valve to the other. Then tighten the 4 corner bolts alternating
from one side of the valve to the other.
A
B
F
C
E
G
D
Close Test Cocks and Double Check All Closing/Sealing Mechanisms
1. Using the test cock wrench or a small adjustable wrench
close main test cocks number 2, 3 and 4 (A). (Test cock
is closed when wrench flats on stem are perpendicular to
water flow through test cock)
2. Deringer 30G/30GX: Using a #2 flathead screwdriver close
bypass test cock number 1 and 2 (B). (Test cock is closed
when screwdriver slot on stem is perpendicular to water flow
through test cock)
3. Use the “T” handles to open bypass ball valve number 1 (D)
and then open bypass ball valve number 2 (C). (Ball Valve is
open when “T” handle is parallel to water flow through
ball valve)
4. Double check to be certain of the following:
• All cover bolts are tightened (E)
• Deringer 30G/30GX: Bypass check valve cover is
tightened (F)
• Deringer 30G/30GX: Bypass meter coupling nuts are
tightened (G) FLOW
A
B
C
E
F
G
D
Open
Open
A
B
Closed
Closed

Open Shutoff Valves to make Backflow Preventer Functional
1. Slowly rotate shutoff valve #2 handle (A) to the open
position. Stem exposed (B).
2. Slowly rotate shutoff Valve #1 Handle (C) to the open
position. Stem exposed (B).
FLOW
A
C
B
OpenClosed
Limited Warranty: Ames Fire & Waterworks (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.
IOM-A-Deringer 20G/20GX/30G/30GX_6-8 2020-05 EDP2916000 © 2020 Watts
USA: Backflow T: [phone] • F: [phone] • AmesFireWater.com
USA: Control Valves T: [phone] • F: [phone] • AmesFireWater.com
Canada: T: [phone] • F: [phone] • AmesFireWater.ca
Latin America: T: (55) 4122-0138 • AmesFireWater.com