13
6.2.2 HST Model (System Boiler)
Figure 6. HST Boiler
Figure 7. Installation for HST Boiler
**External WRAS appoved filling loop must be added during installation.
1- Main Exchanger
2- Silencer
3- Mixer
4- Fan
5- 3 Way Valve
6- Condensing Water Hose
7- Outlet Manifold
8- 3 Bar Safety Valve
9- Pressure Sensor
10- Condensate Trap
11- Gas Valve
12- Return Manifold
13- Pump
14- Flexible Connection Hose
15- Expension Vessel(8L)
16- Expansion Tank Holder Bracket
17- Rainwater Hose
18- Rainwater Collection Reservoir
19- Ignition Electrode
20- CH Return Temperature Sensor
21- CH Supply Temperature Sensor
22-Flue Gas Sensor
CH Return
Boiler Return
Boiler Supply
CH Supply
Wras Approved
Filling Loop**
DHW
Storage Tank
DHW
Water Main
BS Stop Valve
Fixed spindle type
