Watts AMES Deringer 20G User manual

Installation, Operation and
Maintenance Manual
IOM-A-Deringer 20G/30G_2.5-4
Deringer™20G/30G
Double Check Valve/Double
Check Detector Assemblies
Size: 2½" – 4"
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
!

2IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
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
18mm Socket & Wrench Wood Block 2" x 4" x 5"
Wood Block 1" x 2" x 16"
#2 Phillips Head Screwdriver #2 Flathead Screwdriver 5/8" Ratchet Wrench
Adjustable Wrench Deringer Test Cock Wrench Slip-Joint Pliers

3
IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
Closing Shutoff Valves Prior to Maintenance
1. Slowly rotate shutoff valve #2 handle to the closed
position. Stem concealed (A).
2. Slowly rotate shutoff valve #1 handle to the closed
position. Stem concealed (A).
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 (A).
FLOW
FLOW
A
ClosedOpen
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 adjust-
able 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 only: Using a #2 flathead screwdriver open
bypass test cock number 2. (Test cock is open when screw-
driver 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 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
A
A
Bypass Test CockMain Test Cock
Closed Open Closed Open

4IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
Removing Access Port Cover Plate
B
C
A
A
1. Using a 5/8" socket wrench loosen all
eight bolts on the access port cover
plate (A).
2. Remove bolts (A) and store in a safe
place. If lost, tapered bolts must be
replaced with like Deringer cover
bolts and cannot be substituted with
standard bolts.
3. Remove access port cover plate (B).
Do not remove access port O-ring (C).
Removing the First Dual-actionTM Check Module
FLOW
C
1. Use a torx 45 bit or key 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). This allows
easy removal of check modules
2. Insert a flathead screwdriver between the inner valve
body and the first check module flange (C), gently
move the first check module in the downstream
direction until the first check module can easily be
removed from the access port by hand.
B
NOTICE
There are several different versions of the check retaining bolts.
Make sure you use the proper tool for the different types. (torx,
hex, allen)
A
Removing the Second Dual-action Check Module
FLOW
C
A
1. Remove 1st check prior to removing 2nd check as
described above.
2. Use a torx 45 bit or key to loosen the check retainer
bolts on both 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).
3. 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.
B
A
NOTICE
There are several different versions of the check retaining bolts.
Make sure you use the proper tool for the different types. (torx,
hex, allen)

5
IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
Deringer 30G: Disassembly and Maintenance of Bypass Check Valve
C
B
A
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.
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.
A
AC
B
D

6IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
Deringer 30G: Removing Bypass Meter
1. Using the ball valve handles close the #2 bypass ball valve
(D) 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 screw driver open bypass test cock
#2 (B) 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.
C
E
E
G
F
E
FLOW
A
B
D
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 is captured (C) and does not 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
H
B
CA

7
IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
Maintenance of First Dual-action Check Module (Continued)
First Check Tower Bosses and Spring Arms Face Up
Orient seat protrusions as shown
Tower Bosses
Spring Arms
NOTICE
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.
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 is captured (C) and does not 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).
G
D
H
B
C
A
E
DF
NOTICE 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.

8IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 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 move 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 (A) has 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
A
B
G
Not BindingBinding
H
F
I
D
E

9
IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 2020 Watts
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). 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), coax 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
D
NOTICE
Recommended torque for the check retainer bolts is 50 ft. lb.
I
F
G

10 IOM-A-Deringer 20G/30G_2.5-4 2005 EDP#2916003 © 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 cover bolts (D) into tapered cover holes (E).
4. Use ratchet wrench (F) to sequentially tighten all cover bolts (D) alternating from
one side of the valve to the other.
AB
E
C
F
D