Ames Fire & Waterworks 20S Bronze Residential Fire Sprinkler System Dual Check Backflow Preventers - Manual (Page 2)

Kit for Series 20, 20S
ORDERING CODE KIT NO. SIZE
in. mm
0085613 RK 20/Cu20 T 1 ⁄
2
- 1 1 ⁄
4
20 15 - 32
1 ⁄
2
- 1 Cu20 15 - 25
0085614 RK 20S T 1 - 1 1 ⁄
4
20S 25 - 32
Kit Includes: First and Second Check modules, O-rings and spacers if needed.
Service, Replacement Parts and Maintenance
Servicing Series 20, 20S
1. Remove the Series 20 from the line (union nut and adapter
remain in the line).
2. Remove the two check modules by pressing firmly from the
outlet end (end with wrench pads). O-ring seals will be
removed with the removal of modules from the body.
CAUTION: To prevent damage to O-ring seals, do not attempt to
pry the O-ring seal free before removing check modules.
NOTE: Complete check module assemblies are available as
replacement parts. It is recommended that if check modules are
fouled, that the entire check module be replaced.
3. Inspect body bore and clean surfaces of any foreign
material.
4. Using silicone grease, apply small amount to each exterior
surface of the O-ring seals. If O-ring is to be replaced, lubri-
cate as above. A light application of silicone grease to inlet
of body bore is beneficial. Do not lubricate seat of seat
disc.
NOTE: Only FDA approved silicone grease should be used and is
furnished with each Ames Model 20, 20S dual check repair kit.
5. Reinsert the check modules and O-rings into body in direc-
tion of flow.
NOTE 1: For 20S the spacer slots must be aligned with the ribs of
the first check module before inserting
NOTE 2: 1st and 2nd check modules are identical and
interchangeable. Do not overtighten union nut.
Servicing Model L20
1. Shut off water at street side of meter.
2. Remove covers and remove Disc Assembly.
3. Inspect rubber disc for dirt or debris.
4. Clean and/or replace as needed.
5. Inspect machined seat area for nicks and mineral build up
clean with emery cloth.
6. Reassemble the check assembly in the reverse order. (1st
and 2nd check modules are identical and interchangeable)
Kit for Series L20
ORDERING CODE KIT NO. SIZE
in. mm
0085615 RK L20 T 3 ⁄ 4 , 1 20 - 25
Inlet Outlet
1st Check Module
1st Check Module
Check Covers
2nd Check Module
2nd Check Module
O-ring Module seal
Individual O-ring Check Seals
O-ring
Series 20
Series L20
RP/IS-A-20 0904 EDP# 1915925 ©Ames Fire & Waterworks, 2009
www.amesfirewater.com
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