34
Figure 31 - Zoning with pumps - Multizone hydronic piping
1 Cosmogas combi
2 -
3 Heating drain cock
4 Pressure disconnector
5 Flow checks
6 Optional ball valve to isolate heater
7 Supply piping to zones
8 Gas cock
9 Automatic feed
10 Optional ball valve
11 Back-flow preventer
3 - INSTALLATION
12 Added system pump
13 Optional ball valve
14 Tees with drains to bleed zones
15 Return piping from zones
16 Pressure relief valve 150 psi
17 Sanitary drain cock
18 Mixing valve
19 Flow restrictor
20 Hot water outlet
21 Cold water inlet
22 Gas inlet