SERVICING
SERVICING
41 SERVICING SCHEDULE
To ensure the continued safe and efficient operation of the appliance it is recommended that it is checked at regular intervals and serviced as necessary.
The frequency of servicing will depend upon the installation condition and usage but should be carried out at least annually.
It is the law that any service work must be carried out by a registered CORGI installer.
In IE, servicing work must be carried out by a competent person.
1Turn the heating controls to maximum so that the boiler lights and remains running. Check that no other gas appliances in the house are in use or likely to be used.
2When the boiler has settled down check the gas rate at the meter (if the meter is of the pointer type you should time only complete revolutions of the pointer). Check the gas rate against the figures given in Table 2 for CH operation.
3For a combination boiler, fully open a hot water tap. When the boiler has settled down check the gas rate, as in step 2, checking the measured rate against the figures given in Table 3 for HW operation.
4Run the boiler and check the percentage of CO and CO2 in the flue gasses at the sampling point indicated in the following drawing.
Air intake | Exhaust gas | |
Sampling points | ||
Sampling points | ||
|
Note. If your meter reads CO in parts per million the figure must be divided by 10,000 to convert it to a percentage.
5If the ratio of CO/CO2 is less than ,004 and the gas rates measured in steps 3 and 4 are close to nominal then no further action need be taken. If not, proceed to step 6.
6Clean the main burner.
7Clean the heat exchanger.
8Check the injectors for blockage or damage.
9 Check that the flue terminal is unobstructed.
10Check and clean the condensate trap and drain (see frame 73).
The servicing procedures are covered more fully in Frames 42 to 47 and MUST be carried out in sequence.
WARNING.
ALWAYS turn off the gas supply at the gas service cock, and switch off and disconnect the electricity supply to the appliance before servicing.
Switching the boiler on/off switch ‘off’ does not fully isolate the boiler.
ALWAYS test for gas tightness and carry out functional checks on reassembly.
IMPORTANT. When work is complete the boiler inner front sealing panel MUST be correctly refitted, making a good seal.
DO NOT OPERATE THE BOILER IF THE SEALlNG PANEL IS NOT FITTED.
Complete the service section in the Benchmark Commissioning Checklist.
34 | mini HE |
