User manual SAUNIER DUVAL ISOMAX F 28 E

[. . . ] ISOMAX IN WARRANTY TECHNICAL HELPLINE THIS IS A CAT I2E+ APPLIANCE 01773 828400 01773 828100 1 INSTALLATION AND OPERATING INSTRUCTIONS ISOMAX F 28 E Note!The boiler serial number is marked on the label attached to the inside of the drop down door. Refer to the 'Introduction' section page 3 for a description of the basic functions of the boiler. The 'Users' section describes how to safely operate the boiler. USERS SECTION Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 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 the modulating gas valve coil, see diagram 23. Set the OFF/Summer/Winter switch to the `Summer' position. Adjust the domestic hot water temperature adjuster to maximum setting. Remove the protective cover from the gas valve adjuster. Turn nut `A', see diagram 23: CLOCKWISE: To increase the pressure. ANTICLOCKWISE: To decrease the pressure. Maximum setting Reconnect the electrical connector removed from the modulating gas valve coil. Remove the protective cover from the gas valve adjuster. Turn nut `B', see diagram 23: CLOCKWISE: To increase the pressure. ANTICLOCKWISE: To decrease the pressure. After adjustment, refit the cover to the gas valve adjuster. Bypass The ISOMAX has a built-in bypass. This must be adjusted according to the requirements of the system, refer to the flow rate pressure curve (diagram 4). 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 24. Turn the screw clockwise to close the bypass. When using thermostatic radiator valves (TRV's) on all of the radiators, it is essential that a separate, adjustable bypass of 15 mm minimum diameter is fitted between the flow and return of the heating circuit, see diagram 8. Any bypass must be fitted before system controls. Electrical connection MODULATING COIL Diagram 23 a Diagram 24 20 Reg 054 Reg 020 ROUTINE CLEANING AND INSPECTION To ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at regular intervals. The frequency of servicing will depend upon the particular installation conditions and usage, but in general once a year should be enough. It is the law that any servicing is carried out by a qualified registered person. · Operate boiler and check for any faults that need to be put right. · Isolate boiler from the gas and electrical supplies. [. . . ] 1070 90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 920 95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 785 100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 680 System pressure sensor The resistance of the sensor at various pressures is as follows : 0 bar . . . . . . . . . . . . . . . . . . . . . . [. . . ]