I N S T A L L A T I O N , O P E R A T I O N , M A I N T E N A N C E
IOM-F-825_826
Operation and Maintenance Manual
Reduced Pressure Backflow Prevention Assemblies
Models 825Y, 825YA, 825, 825D, 825YD & 826YD
Read and understand this manual prior to installing,
operating or servicing this equipment.
TABLE OF CONTENTS
Features and Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Freeze Protection Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Vandalism Protection Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Troubleshooting Procedures and Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7, 8
Field Testing Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9, 10
Service Procedures Model 825Y (
3
/
4
–2") . . . . . . . . . . . . . . . . . . . . . . . 11, 12, 13
Parts Lists and Part Numbers Model 825Y (
3
/
4
–2") . . . . . . . . . . . . . . . . . . 14, 15
Exploded View of Model 825Y (
3
/
4
–2") . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Service Procedures Models 825, 825D and 825YD (2
1
/
2
–3") . . . . . . . . . . 16, 17
Service Procedures Models 825, 825D and 825YD (4–10") . . . . . . . . . . . 18, 19
Parts Lists and Part Numbers Model 825 (2
1
/
2
–10”) . . . . . . . . . . . . . . . . . 20, 21
Exploded View of Model 825 (2
1
/
2
–10") . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Parts Lists and Part Numbers Models 825D and 825YD . . . . . . . . . . . . . . . . 22
Exploded View Models 825D and 825YD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Parts List and Exploded View of Model 825D and 825YD Check Assembly 24
Parts List and Exploded View of Model 825 and 825D Relief Valve . . . . . . . 25
Parts List and Exploded View of Model 825YD Relief Valve . . . . . . . . . . . . . 26
Parts List and Exploded View of Model 826YD Relief Valve and Bypass . . . 27
Service Procedure Relief Valve Models 825, 825D and 825YD (2
1
/
2
–10") 28, 29
Spring Removal Tool Instructions Model 825 (2
1
/
2
–10") . . . . . . . . . . . . . . . . . 30
Commercially Available Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . 31, 32, 33
How To Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Series 825Y
Series 825YA
Series 826YD
