Technical data

33
Fan and Motor
Check that the fan is secure and rotates
freely without excessive play in the shaft.
The fan blades and motor should be
cleaned using a soft brush.
The fan and motor assembly can be
removed from the heater by first
disconnecting the leads from the terminal
block and by removing the strain relief bush.
The four screws securing the fan and motor
assembly to the rear of the plenum can be
removed, and the assembly complete with
guard can then be removed from the heater.
Limit stats
If the heater has gone into an overheat
condition, remove the black dust cover and
depress the green button.
On models with two fans a second limit
control is situated inside the right side panel
and is wired in series. If the heater has gone
into an overheat condition, depress the red
button.
Flue System
Check that the flue is in good condition, that
it is adequately supported, that there are no
blockages or restrictions.
Check that any joints are properly sealed
preventing an escape of products of
combustion.
Check condensate drain if fitted.
.
Check for signs of water ingress and any
resultant damage.
Flue Venter
Check that the flue fan is clean and free
from any dust deposits.
Differential Air Pressure Switch
Check that the tubes are connected and
clear and free from dust.
Check that they are not kinked or damaged.
Check electrical connections are intact.
Test
Test and re-commission as per sections 3.0
to 3.4 inclusive.
Automatic Controls
Automatic control is by way of a Honeywell
controller.
Spark Ignition is via an ignition electrode
ensure that the ceramic insulation material
is not damaged or cracked.
Flame supervision is via a flame sensor rod.
Check the flame sensor rod for signs of
pitting or corrosion, ensure that the ceramic
insulation material is not damaged or
cracked. Check connections are secure.
Main Governor
To adjust the main governor, using a
screwdriver remove the metal cover to
reveal the adjustment screw, and turn as
follows :
Clockwise to increase pressure.
Anticlockwise to decrease pressure.