Technical data

injectors are correctly aligned, and that they
are clean, and that there are no
contaminates restricting the orifices, if
necessary clean carefully with compressed
air and or lint free cloth and acetone.
Caution
The injector orifice is precision machined to
fine tolerances, do not clean with hard sharp
or abrasive instruments. If the injectors have
been removed from the manifold, when they
are replaced, and care should be taken not
to over tighten.
Ensure all joints are gas tight.
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.
Fan and Limit Thermostats
Open the right hand door, so as to gain
access. Remove securing screw from cover,
remove cover plate and disconnect the
cables. Remove the screws which secure the
unit to the side of the heater and withdraw
the thermostat complete from the heater.
Check that the bi metal coil and its housing
are secure clean as necessary with a soft
brush .
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.
Multibloc Valve
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.
It should be noted that full clockwise
adjustment will result in the valve being
closed permanently.