andrews R18 Series, Technical Documentation Manual

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18IP22B
41
Fig. 27 Measuring ionisation
6.4 Instructions to user Upon satisfactory completion of commissioning hand the Tech-
h. Re-check the main burner pressure at maximum and by
modulating the damper down also check the main burner
indicated in table 15, adjust if necessary at the main
burner governor.
Check this against a gas rate reading at the installation
gas meter.
i. Check the operation of the water flow switch by gradually
closing down one of the water heater isolating valves. The
water heater should go to lock-out.
j. Check that the pump overrun is operating correctly when
the water heater is switched off and that any time controls
are operational.
nical documentation to the person responsible for the plant and
explain the method of safe operation. Ensure that he/she is fully
conversant with the starting, shut down, general operation and
emergency shut down procedures. Explain the operation of the
high limit thermostat, but stress that in case of repeated over-
heating of the water heater that the fault should be corrected by
a competent person.
Stress the importance of regular servicing for safe and efficient
operation and that if a gas leak is detected to turn off the water
heater at the gas service cock and to call the local gas supplier.
Water heater failure
In case of water heater failure the system will fall into lock-out.
Reset the water heater with the reset button on the control
panel. Repeat this several times if necessary. If the water
heater still does not start, refer to chapter ‘Operation and fault
finding’ (7).