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| | | | | | | | | | | | | | | | | | | | | | | | | | | | SETTINGS | | | | | | | | | | 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. • Connect a suitable pressure gauge as described in 'Commissioning'. Maximum setting • Remove one electrical connector from the modulating gas valve coil. • Turn the domestic hot water temperature adjuster to maximum setting. | | | | | | | | | | • Remove the protective cover
| | A | | | | | | | | | | from the gas valve adjuster. Using a 2 mm 0 rod, press in the spindle in the middle of screw M, see diagram 25. • Turn nut 'B' to obtain the desired pressure, see technical data. | | | | | | | | | | Minimum setting This must be done AFTER the maximum setting. • Hold not B to prevent from turning, turn nut 'A' to obtain the desired pressure, see technical data. After adjustment, refit the cover to the gas valve adjuster and refit electrical connector. Bypass The THEMA F 23 E has a built-in bypass. This must be adjusted according to the requirements of the system, refer to the flow rate pressure curve (diagram 3). The boiler is supplied with the built-in bypass open a half a turn. It is adjusted by turning the bypass screw (a), see diagram 26. Turn the screw clockwise to close the bypass. When using thermostatic radiator valves (TRV's), it is recommended that an additional, adjustable bypass of 15 mm minimum diameter is fitted between the flow and return of the heating circuit, see diagram 6. Any bypass must be fitted before system controls. | | | | | | | | | | PCB Settings The PCB on the Thema F 23 E can be set to operate in different ways to suit individual installations. The dip switch SW1, see diagram 27, should be set as follows: | | | | | | | | | | 1 - OFF 2- ON 3 - OFF | | 4 - OFF 5- OFF 6 - OFF | | | | | | | | | | CHANGING GAS TYPE- Should it become necessary to change the gas type, a modification kit will be required. This modification must only be carried out by a suitably qualified engineer. Conversion: Natural Gas (G20) to G30/G31 Part No. 86161 | | | | | | | | | | J | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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