andrews R18 Series, Technical Documentation Manual

Page: 57 / 71

18IP22B
49
8.4 Cleaning Before using chemicals and cleaning agents in the water hea-
Always read the instructions on the bottle of the cleaning
The heat exchanger may become heavily soiled (soot for
8.5 Servicing WARNING: ONLY COMPETENT PERSONS SHOULD CARRY
Ensure that both gas and electrical supplies are switched off
ter, please contact your supplier for advise.
agents before using them.
Heat exchanger (external cleaning)
Remove the baffles before cleaning the heat exchanger.
- Use compressed air when the heat exchanger is lightly
soiled.
- Use a stiff brush and soap when the heat exchanger is very
dirty, do not allow the refractory brick-work to get wet.
NB.
example), when the instructions are not followed properly.
This may be caused by:
- insufficient
ventilation
- condensation on the heat exchanger.
If this is the case, clean the complete heat exchanger, including
the baffles. Furthermore, the cause of the problem should be
ascertained and rectified.
Heat exchanger (internal cleaning)
Descale the heat exchanger with the correct chemicals.
Filter inspection (use of a gas filter is recommended)
When the pressure loss over the gas regulator gets too high,
the burner pressure will decrease noticeably. A dirty gas filter
may be the cause. The filter should be inspected at least once
every year. To allow access to the filter element, first remove
the side cover of the gas regulator assembly. Then remove the
filter and replace it if necessary. Replace the cover and check
for leaks.
OUT SERVICING ON THIS WATER HEATER IN ACCOR-
DANCE WITH THE GAS SAFETY (INSTALLATION AND USE)
REGULATIONS 1984.
before carrying out any service operation.
After carrying out any service operation it is important to
check for gas soundness and re-commission the water heater
as described in Section 6 - Commissioning.
Ensure that any panels covering live connections are replaced
securely upon completing any service operation. Wiring dia-
grams and components lists are supplied separately.