Bell & Gossett HS 902D Model 62 Vacuum Breaker - Manual (Page 3)

3
1. Make sure the steam, air or water supply is turned off
and pressure is relieved. On steam systems, allow
unit sufficient time to cool.
2. Remove complete vacuum breaker from system.
3. Pull cover (A) from base (B), this is a snap in place
cover that can be removed by hand.
4. Measure and note distance from end of stem (C) to
top locknut (D). Remove locknuts (D) and (G),
spring (E), and stem (C) from base (B).
5. Remove O-Ring (F) from stem (C) and discard.
Clean all parts, apply silicone lubricant to new O-Ring
and push into the shoulder of the stem, Make sure
the O-Ring is flat with the end of the stem.
6. Reassemble all parts. Tighten locknuts (D) and (G) to
the same distance as measured in step 4 (above).
Push on the stem several times to make sure it is free
to move in its guide and snap cover in place on base.
7. Reinstall on system and check for leaks.
MAINTENANCE
SCHEDULE:
• Initially and every 6 months thereafter.
• Replace vacuum breaker every 15 years.
More frequent replacement of the vacuum breaker
is required when used on water systems in
locales where significant water treatment is
required, or where more frequent cleaning is
necessary.
PROCEDURE:
• Turn off steam or water before servicing
vacuum breaker.
• To prevent serious burns, wear heat resistant
gloves when handling hot equipment.
Failure to follow this caution could cause
personal injury.
! CAUTION
O-Ring Replacement (Part Number 601313)
F
B
E
D
G
C
A
1. Inspect for leaks. Stop all leaks by tightening or
replacing O-Ring, as necessary.