Maintenance - andrews MAXXflo Installation, Operation And Maintenance Manual

MAINTENANCE

At least once a year, the following works must be
carried out:
1. Check the CO 2 percentage at Minimum and
Maximum load. Adjust if necessary, (see page 33)
2. Check the output at full load by measuring the gas
usage. If this deviates more than 10% from the
nominal value (see Section 2, Technical Details)
then this is an indication of dirt or blockages
in the flue gas exhaust channel, the air supply
channel or the condensation drain.
3. Check the condensation drain and rinse the
condensation tray and condensation drain with
clean water. An opening has been provided for
this on the top of the condensation tray, see
Fig 16 (below). Rince with fresh water until
the condensation drain is running clear. It is
recommended that the condensate hose and 90
drain elbow is removed from each heat engine to
remove all debris from the sump.
Fig 16 – Flushing Point
It is important to make sure the sump is
clear and the condense can flow freely
4. Check the ionisation electrode. This must be
straight and clean (light residue is normal).
5. Flush the water heater tank by opening the
drainage tap. Let water flow out of the water
heater until no more chalk residue comes out with
the water. In areas with hard water, it is necessary
to flush out the water heater more frequently.
6. Test the operation of the TRV and expansion
valves by opening and letting an adequate
amount of water flow and then shutting them,
until water flow stops. Whilst doing this, make
sure the discharge pipe does not back up.
7. If the water heater is to be drained for any reason,
first take the water heater out of operation and
then proceed as follows:
(i) Turn off the water tap in the cold water supply.
(ii) 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.
(iii) Open the drainage tap of the water heater so the
appliance runs empty. Be careful, the water
flowing out can be very hot!
8. The storage tank should be inspected annually
and cleaned if required. To gain access, first 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
O
may be required.
9. Unscrew and remove the head of the pressure
reducing valve, clean and reasemble.
Burner and exchanger
The 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. The
top of the exchanger must never be opened.
The 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 altered or dismantled.
MAXXflo Water Heater
MAINTENANCE • SECTION 7
37 37