Potterton Promax SL Series Installation & Service Instructions Manual page 75

Fig. 53
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. Fit the new gas valve and reassemble in reverse order.
NOTE: Check for gas tightness after replacing gas valve.
11. Check the CO/CO ratio and CO
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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.
15.9 Condensate Trap (Fig. 54)
1. Disconnect the condensate trap from the base of the heat exchanger.
2. Disconnect the condensate drain (outside the boiler) from the condensate trap.
3. Undo the condensate trap lock nut and remove the trap from the boiler. Disconnect the sensor leads.
level at the flue sampling point (Fig.41a) is as quoted in Section 4.0, 'Technical Data'.
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