Bell & Gossett HS 217D Dura-Stat Thermostatic Module - Manual (Page 3)

For Spirax-Sarco Trap Model TB-25; 1/2” (15mm) NPT
and Model TS-25; 1/2” (15mm) NPT
3
A
B
A
C
D
B
1. Remove the trap cover (A) from the body (B).
2a. Unscrew the coil spring (C) from
the trap cover (A).
b. Discard the coil spring (C).
3a. Remove the thermostatic element (D) from
the trap body (B).
b. Discard the old thermostatic element (D).
E
F
B
4a. Using a 5/8” (16mm) socket wrench,
remove the seat (E) and gasket (F) from
the trap body (B).
b. Discard the old seat (E) and gasket (F).
B G
5. Using a scraper, remove any scale or
debris inside the trap body (B) especially
around the seat area (G). Do not scratch
gasket surface area.