0108RPVDGBEN
12
SECTION 7 MAINTENANCE
7.1
General
Before commencing servicing, turn off the main
gas supply and switch off the main electricity
supply
after the air circulation fan has stopped
.
7.2
It is recommended that maintenance is carried
out at least once a year. More frequent servicing
may be required dependent upon the
environmental circumstances where the air
heater is installed. Regular inspection is
necessary, especially in dirty areas, to assess the
servicing frequency.
7.3
Check condition combustion air fan and
combustion circuit.
7.4
Check for security and worthiness of the
suspension or mounting system.
7.5
To gain access to the controls and combustion
air fan assembly.
Refer to figure 8
-1
Unlatch cam fastener ¼ turn counter
clockwise on controls compartment access
panel.
- 2
Remove access panel.
- 3
Unscrew retaining screw at top of upper
cover panel.
- 4
Upper panel can now be removed by
pushing upwards 2 cm to disengage panel
retaining lugs and then lifted away.
- 5
The flue installation should include a
service access section adjacent to the
connection socket allowing access to the
top of the flue fan. In the event that the
fan housing assembly requires removal i.e.
for replacement, then it is necessary to
remove that section to access the 4
securing screws that fasten the fan
housing through the top of the appliance.
All controls, electrical and flue gas
components are now accessible.
7.5.2
For appliances fitted with horizontal flue
systems: follow steps 1 & 2 above and
then;
- 1. Disconnect flue and combustion air inlet
pipes at the section provided. Ensure that
the pipes will remain supported when
disconnection has been made.
- 2. Remove 4 sheet metal screws securing the
venter fan to the upper cover panel.
- 3. Follow steps 3 & 4 7.5.1 above.
7.5.3
To replace reverse order above as appropriate.
7.6
If it is necessary to remove the cabinet top panel
to gain access to the flue products collector box
or the top of the heat exchanger, it is necessary
to:
- 1. Isolate and disconnect the electrical and
external controls wiring that passes
through the panel.
- 2. Isolate and disconnect the gas service to
the air heater.
- 3. Remove all of the sheet metal screws that
secure the top panel to the appliance and
remove panel as required.
7.7
Remove all dust and dirt from the combustion air
fan (venter) see fig. 10 If dismantling venter
observe critical dimensions before reassembly.
7.8
Check that air circulating fan guard is undamaged
and secure.
7.9
Check security of the fan blade and fan motor.
Note:
The fan motor is lubricated for life and
does not require lubrication.
7.10
Inspect hot surface igniter fig.9 replace if in
doubt about its condition.
Note: The Igniter
device is fragile, therefore, handle carefully
7.11
Inspect and clean the burner assembly, refer to
fig.11
7.12
Inspect heat exchanger and clean as necessary.
This can only be done after removing the burner
assembly.
7.13
After removal of burner assembly, each element
of the heat exchanger can be cleaned by use of
a soft brush and compressed air. Clean both
inside and the outside surfaces.
7.14
Clean burners and gas jets with soft brush and
compressed air. To prevent damage, do not use
hard objects for cleaning the gas injectors
7.15
If fresh supply air intake is provided by means of
a weatherproof grille ensure that it is clean and
protected against blockage, e.g. by leaves, etc.
7.16 If anchor lines of service panels are removed
during servicing, they must be refitted upon
completion of the service.
7.17
Upon completion of any service work it is
necessary to recommission the appliance in
accordance with the step procedure
described in section 6.7.2 of this document.
