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7.4.10 When the set temperature or the heating time period
has been reached, electrical power to the burner
relay will be switched of and the burner will
extinguish. The air fan will continue to run until the
heat exchanger has been cooled down to a safe
level.
7.4.11 To turn off the air heater for a short period,
a. turn room thermostat to lowest setting.
To relight reset thermostat.
For prolonged period;
a. turn room thermostat to low setting,
b. turn gas supply to the appliance off.
c. switch off electricity supply to the air heater
after air
circulation fan has stopped
.
To relight follow lighting instructions.
7.4.12 The gas service tap must only be operated in
emergencies, for servicing or prolonged periods of
shutdown of the air heater.
SECTION 8. MAINTENANCE
8.1
General
Before commencing servicing, turn off the main gas
supply and switch off the main electricity supply
after
the air circulation fan has stopped
.
8.2
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.
8.3
Check condition and security of flue and combustion
air system.
8.4
Check for security and worthiness of the suspension
or mounting system.
8.5
To gain access to the controls and flue gas fan
assembly.
8.5.1 For appliances fitted with vertical flue systems, refer to
figure 8. Follow the four step procedure:
- 1. Unlatch cam fastener
3
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.
8.5.2
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 8.5.1 above.
8.5.3 To replace reverse order above as appropriate.
8.6
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.
8.7
Remove all dust and dirt from the combustion air fan
(venter) see fig. 10 If dismantling venter observe
critical dimensions before reassembly.
8.8
Check that air circulating fan guard is undamaged and
secure.
8.9
Check security of the fan blade and fan motor.
Note:
The fan motor is lubricated for life and does not
require lubrication.
8.10 Inspect hot surface igniter fig.9 replace if in doubt
about its condition.
Note: The Igniter device is
fragile, therefore, handle carefully
8.11 Inspect and clean the burner assembly, refer to fig.11
8.12 Inspect heat exchanger and clean as necessary. This
can only be done after removing the burner assembly.
8.13 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.
