Maintenance - andrews CWH30/200 Installation, Operation And Maintenance Manual

MAINTENANCE

At least once a year, the following works must be
carried out:
1. Check the CO 2 percentage and adjust if necessary,
(see page 33).
2. Check the output at full load by measuring the gas
usage. If this deviates more than 15% from the
nominal value (see Section 2, Technical Details)
then this is an indication of dirt or blockages in the
fl ue gas extraction channel, the air supply channel
or the condensation extractor.
3. Switch off the electricity supply. Check
the condensation extraction and rinse the
condensation tray and condensation extraction
with clean pipe water. An opening has been
provided for this on the top of the condensation
tray, see Fig 16. When no more impurities come out
then the condensation extraction is clean.
4. Check the ionisation electrode. Th is must be
straight and clean (light residue is normal).
Fig 16 – Flushing Point
5. Flush the water heater tank by opening the
drainage tap. Let water fl ow out of the water heater
until no more chalk residue comes out with the
water. In areas with hard water, it is necessary to
fl ush out the water heater more frequently.
6. If the water heater is to be drained for any reason,
fi rst take the water heater out of operation and
then proceed as follows:
a. Turn off the water tap in the cold water supply
b. Open one of the warm water taps that can be
found at a point higher that the water heater in
order to bleed the warm water pipe section. If
the water heater is set up above the level of the
drainage points, it will be necessary to open the
warm water connection to let the appliance run
empty.
c. Open the drainage tap of the water heater so the
appliance runs empty. Be careful, the water fl owing
out can be very hot!
7. Th e storage tank should be inspected annually and
cleaned if required. To gain access, fi rst drain the
tank as above. Remove the inspection hatch clamp
securing the hatch and lift out the hatch plate.
Please check the hatch seal as a new one may be
required.
Burner and exchanger
Th e burner and exchanger do not normally need to
be cleaned. If there is a suspicion of dirt then the
exchanger should be opened on the bottom. New
gaskets must always be used when assembling. Th e
top of the exchanger must never be opened.
Th e hot surface igniter is a vulnerable part that should
only be removed if it has to be replaced.
Only original parts recommended by the manufacturer
can be used as replacement parts. Components that
are sealed may not be changed or dismantled.
MAXXfl o Water Heater
MAINTENANCE • SECTION 7 37 37