Main Heating Main Heat 12, Инструкция по установке и обслуживанию, Страница: 62 / 83

Fig. 44
page 45
15.0 Changing Components
15.1 Changing Components
IMPORTANT: When changing components ensure that both the gas and electrical supplies to the boiler are isolated before any work is started.
"The boiler cannot be switched off at the boiler, therefore it is important to isolate the electrical supply at the mains fuse." ​
Hazardous materials are not used in the construction of these products, however reasonable care during service is recommended.
When replacing the combustion box door after changing components, it is essential that the retaining screws are tightened fully.
After Changing Components a combustion check should be performed (see Section 15.8.11 ).
This is especially important on gas carrying parts, and those that may affect combustion (e.g. fan).
1. Before changing any components please read Section 1.2 Important Information.
2. Remove the outer case and lower door panel (see "Fitting the Outercase" ​ Section 13.0.0 ).
WARNING: The PCB Control and Fan Assembly are 325 Vdc. Isolate at supply before access.
3. Isolate the water circuit and drain the system as necessary. A drain point is located on the heat exchanger manifold at the right hand side of the boiler
( Fig. 45 ) to enable the heat exchanger to be drained.
4. Place a tube on the drain point to drain water away from electrics. Turn anticlockwise to open ( Fig. 45 ).
NOTE: When reassembling always fit new 'O' rings, ensuring their correct location on the spigot.
Green "O"
​ rings are used for gas joints and Black "O" ​ rings for water joints.
Use Greasil 4000 (Approved Silicone Grease).
5. After changing a component re-commission the boiler where appropriate and check the inhibitor concentration (see Section 6.2 and 12.1 ).