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INSTALLATION & SERVICE
INSTRUCTIONS
MITRE-AS
GAS FIRED -INSTANTANEOUS SINK WATER HEATER
G. C. APPLIANCE N° 51 476 33
THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984
In your own interest, and that of safety, it is the law that all gas appliances are installed by
competent persons, in accordance with the above regulations. Failure to install appliances
correctly could lead to prosecution.
Follow these instructions carefully and comply with conditions set out in the current edition of the
Building Regulations Local Water Authority Regulations and relevant Codes of Practice relating
to installation of Domestic Water Heating Appliances. (CP 342. and BS.5546).
LEAVE THESE INSTRUCTIONS BY THE METER
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Summary of Contents for Main Mitre-AS
- Page 1 INSTALLATION & SERVICE INSTRUCTIONS MITRE-AS GAS FIRED -INSTANTANEOUS SINK WATER HEATER G. C. APPLIANCE N° 51 476 33 THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984 In your own interest, and that of safety, it is the law that all gas appliances are installed by competent persons, in accordance with the above regulations.
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Page 2: Technical Data
Page 1 Ventilation Page 2 Fixing Page 3 Water connection Page 3 Water spout connection Page 4 Gas connection Page 4 Commissioning appliance Page 4 Checking burner pressure Page 5 Servicing instructions Page 6 To remove case front Page 7 To remove spark igniter Page 7 To remove. - Page 3 NOMINAL BURNER PRESSURE GAS GROUP GAS INLET PRESSURE NOMINAL BURNER INJECTOR PRESSURE SIZE N. G. mbar in. w.g. mbar in. w.g. mm dia 1.25 THE MAXIMUM PERMITTED WATER PRESSURE THROUGH THIS APPLIANCE IS 10 BAR. THE MINIMUM OPERATING HEAD THROUGH THIS APPLIANCE IS 10fT. (3 BAR). ANY OTHER PRESSURE LOSSES INCURRED THROUGH THE ADDITION OF EXTERNAL PIPES AND FIT-TINGS MUST BE TAKEN INTO ACCOUNT ON INSTALLATION.
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Page 4: Water Inlet Connection
Pull handles and knobs from front of appliance. Remove the two fixing screws 1. Fig. 1 Carefully swing out bottom edge of case front to clear tap spindles. Disconnect wire lead from rear of spark igniter and lift off case front. Deter-mine the correct position for the heater taking into account instructions given under "VENTI-LATION AND AIR SUPPLY". - Page 5 Fig. 1 Fig. 2 Page 3 MITRE - AS WARNING...
- Page 6 TO THE USER PLEASE NOTE THIS APPLIANCE IS NOT SUITABLE FOR USE WITH SHOWERS. Page 3A IMPORTANT: Remove short spout if already fitted. REMOTE HOT WATER OUTLET CONNECTION Fig. 3 IMPORTANT: SEE SECTION ON VENTILA-TION AND AIR SUPPLY The appliance is fitted with a remote hot water outlet. This outlet is for use when a hot water supply is required in a room other than the room in which the appliance is fitted.
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Page 7: Gas Connection
Once the pilot is lit wait 10 seconds and turn the burner control knob to the working position marked If the pilot goes out wait one minute and repeat the above operations. Turn on the hot tap and check ignition of main burners. -
Page 8: Servicing Instructions
Page 4 CHECKING BURNER PRESSURE Allow burners to operate for one minute before checking the pressures shown below. GAS GROUP GAS INLET PRESSURE NOMINAL BURNER INJECTOR PRESSURE SIZE N.G. mbar in. w.g. mbar in. w.g. mm dia 1.25 After checking, turn off hot water tap. Remove pressure test gauge and replace screw and sealing washer. - Page 9 Are there any gas leaks? Check tightness off connections. Replace sealing washers if necessary. Does main burner extinguish quickly when hot Check that push rod in water section water tap is turned off? moves freely. Lubricate if necessary. Is heater noisy in operation? Check for flame "lift"...
- Page 10 1. TO REMOVE CASE FRONT Pull handles and knobs from spindles at front of appliance. Remove two fixing screws 8. Fig. 4 Carefully pull out bottom edge of case front to clear tap spindles. Disconnect wire lead (push fit) from rear of spark igniter. Lift case front and remove.
- Page 11 Release the 'Heat Sensor' from the heating unit (centre screw). Pull assembly carefully forward at the bottom and remove from the appliance by gently pulling downwards to clear the burners. Release screw 11. Fig. 6 and separate the unit. The spark electrode and the thermocouple will now be free. To clean the pilot jet, release union nut 12, fig.
- Page 12 Fig. 5...
- Page 13 Fig. 6 Page 7 Remove the complete pilot and sensing device assembly see section 3 Release two union nuts and washers 20. Fig. 5 . DO NOT lose sealing washers. Release screw 21. Fig. 5 at front of flue deflector and remove retaining strip. Carefully pull heating unit forwards out of the appliance.
- Page 14 When re-fitting injectors re-seal the threads using an approved sealing compound, do not allow sealing compound to block the injectors. When re-assembling the main valve spring and washer ensure that the blind hole in the brass valve is correctly located on the push rod before re-fitting the burner assembly.
- Page 15 Fig. 8 Fig. 9...
- Page 16 Fig. 10 Page 8 7. TO REMOVE SLOW IGNITION DIAPHRAGM Remove burner assembly see section 6 Remove four screws 23. Fig. 9 and lift off the cover. Lift out diaphragm assembly, replace if necessary. Re-assemble in reverse order ensuring that the brass weight is on the under side of the diaphragm and locates in the gas chamber.
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Page 17: Short Spare Parts List
The diaphragm assembly must be fitted with the thrust washer and location boss on the top of the diaphragm and the spring around the location boss on the top of the thrust washer. See Fig. Re-assemble in reverse order ensuring that the gas and water tap spindles face forwards. Re-fit drain screw and washer. - Page 18 Page 10 Page 11...
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