Rinnai Q Premier QP85N Installation & Servicing Instructions Manual page 20

Boiler basic piping
1. shut off valve
2. system circulator
3. check valve
4. balancing valve
5. boiler drain valve
6. dirt trap
7. air separator
8. automatic fi ll valve
9. back fl ow preventer
10. expansion tank (in case the content of the built-in expansion tank is not suffi cient)
11. bypass for system cleaning
12. ASME 30 psi pressure relief valve
13. Temperature and pressure gauge
20
12
P
13
T
V1
Service valve
1
2
3
V2
Service valve
11
7
6
10
5
8 9
4
fi gure 8