Main Heating Main Heat 12, Инструкция по установке и обслуживанию, Страница: 67 / 83

Fig. 50, Fig. 51 & Fig. 52
page 48
The removal of the fan is necessary to enable the changing of the injector pipe, condensate trap and gas valve (see section 15.6 ).
15.7 Injector Pipe ( Fig. 53 )
1. Remove the injector pipe by pulling out from the 'O' ring joint in the gas valve.
2. Fit the new injector pipe and reassemble in reverse order.
15.8 Gas Valve ( Fig. 53 )
1. Remove the Control PCB (see Section 15.4 ).
2. Isolate gas supply and disconnect the gas tap by removing the four screws.
3. Undo the case pressure pipe from the gas valve.
4. Disconnect the electrical plug from the gas valve.
5. Remove the fan (see
section 15.6 ) and injector pipe.
6. Remove the two gas valve securing screws from inside the air box holding the gas valve.
7. Remove the gas valve from the airbox side.
8. Remove the aluminium spacer and its gasket from the gas valve.
9. Fit the aluminium spacer and gasket to the new valve.
10. 1Fit the new gas valve and reassemble in reverse order.
NOTE: Check for gas tightness after replacing gas valve.
11. Check the CO/CO
2
ratio and CO
2
level at the flue sampling point ( Fig.41a ) is as quoted in Section 4.0 , 'Technical Data'.
12. If the ratio or level is greater than that quoted, telephone the Technical Enquiries for further advice.
IMPORTANT: No adjustment of the gas valve is permissible.
Fig. 53