6. Servicing
WARNING: Always switch off and disconnect electricity supply
and close the gas service valve before carrying out any servicing
work or replacement of failed components. Access doors on TE
units are fitted with electrical interlocks however these alone
must not be relied upon to prevent equipment operation during
maintenace or servicing work.
6.1 General
Full maintenance should be undertaken not less than once per
year. After any servicing work has been completed or any
component replaced the air heater(s) must be fully commissioned
and tested for soundness as described in Section 6.
6.2 Burner Maintenance
1. Refer to the Burner Instructions supplied with the heater.
6.3 Heat Exchanger Cleaning
1. Disconnect the gas supply at the inlet to the gas controls
assembly.
2. Unplug the electrical connections from the heater electrical
panel to the buner.
3. Remove the nuts securing the burner to the heat exchanger
bushes.
To remove a bush slacken all screws in it and remove (one or
two screws depending on the size of the bush). After oiling point
and thread of grub screws (bush size 1008 to 3030) or under
the head and thread of cap screws (bush size 3535 to 5050)
insert them into the jacking off hole(s) in the bush.
Tighten the screw(s) uniformly and alternatively until the bush
is loose in the hub and fan is free on the motor shaft. Remove
fan and bush.
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