SETTINGS

Bypass When using thermostatic radiator valves (TRV’s), it is essential that a separate, adjustable bypass of 15 mm minimum diameter is fitted between the flow and return of the heating circuit, Gas valve setting All boilers are tested and factory set during manufacture. Should it be necessary to reset a gas valve, for example, after replacement, proceed as follows: Shut down boiler. Minimum setting Remove one electrical connector from themodulating gas valve coil, see diagram 19.
MODULATING COIL Connect a suitable pressure gauge as describedin ‘ Commissioning ’. Turn the OFF/Summer/Winter switch to the‘Summer’ position. Turn the domestic hot water temperature adjusterto maximum setting. Remove the protective cover from the gas valveadjuster. Turn nut ‘ A ’, see diagram 19: CLOCKWISE: To increase the pressure. ANTICLOCKWISE: To decrease the pressure. Maximum setting Reconnect the electrical connector removedfrom the modulating gas valve coil. Remove the protective cover from the gas valveadjuster. Turn nut ‘ B ’, see diagram 19: CLOCKWISE: To increase the pressure. ANTICLOCKWISE: To decrease the pressure.After adjustment, refit the cover to the gas valveadjuster.
Diagram 19 Reg 020

CHANGING GAS TYPE

Should it become necessary to change the gas type, a modification kit comprising injectors and factory set gas valve will be required. This modification must only be carried out by a suitably qualified engineer. 16
85820 C 10/97