22-Flue Gas Sensor
6.2.3 CH Model
Resistors
Overheat Thermostat
Air Purge
Terminal Blocks
Expansion Vessel
Circuit Breaker
Contactor
Relay Boards
Drain Valve
Pressure Sensor
Flow Manifold
Pressure Relief Valve
Circula
�
on Pump
Figure
9.
CH Boiler
14
Figure 8. Installation for ST Boiler
**External WRAS appoved filling loop must be added during installation.