Section 12: Servicing Instructions; Annual Service Procedure; Component Removal - Roberts Gorden CRT-10 Installation, Operation & Service Manual

®
CORAYVAC I
NSTALLATION

SECTION 12: SERVICING INSTRUCTIONS

IMPORTANT: Never use the heater as a support for
ladders or other access equipment. Always test for
gas soundness with a suitable detection fluid after
completing any servicing or exchange of gas carry-
ing component. On completion of any service/fault
finding tasks which require the breaking and remak-
ing of electrical connections, recheck the following:
A:Earth Continuity, B:Polarity and C:Resistance to
Earth.

12.1 Annual Service Procedure

Carry out the following service procedure annually.
The preferred time would be immediately before the
winter heating period. If very dirty conditions arise, it
may be necessary to carry out this procedure more
often. If the unit takes in air through an air duct or
filter assembly, less frequent service may be
necessary.
12.1.1 Isolate the heater from the gas and electricity
supply by shutting off the appliance cock and dis-
connecting the union connector, switching off the
local electrical supply and removing the appliance
plug.
12.1.2 Remove the mains plug from the burner.
Remove the two nuts that secure the burner head to
the combustion chamber. The burner can now be
removed.
12.1.3 Remove the burner to the floor level and
clean internally using a soft brush and compressed
air if available. Take care not to damage the internal
parts of the burner. When removing the burner, take
care not to disturb the gasket on the combustion
chamber.
12.1.4 The electrode is an integral part of the burner
head. Check that the spark gap is approximately 3
mm.
12.1.5 With the burner removed, clean the outer sur-
faces of the tubes using a brush and wipe the inner
surface of the reflector with a soft damp cloth - use a
household detergent if necessary. Never use abra-
sive cleaners on the reflectors.
12.1.6 Reassemble the burner in reverse order.
Carry out the Commissioning and Testing Proce-
dure on Page 35, Section 11.2.
36
O S M
PERATION AND ERVICE ANUAL

12.2 Component Removal

First, isolate the heater from the gas and electricity
supply; shut off appliance cock and disconnect the
gas union connection. Switch off the local electrical
supply and remove the appliance plug.
Entry to the burner assembly is gained by removing
the two (2) door screws and removing the side
cover.
12.2.1 Electrode (See Page 36, Section 12.1.4)
Remove the electrode cover and the two allen
screws that secure the electrode to the burner head.
Inspect the electrode gasket; replace as required.
12.2.2 Injector Jet
When the side cover is removed completely, the
burner assembly is exposed. The jet is located in the
mixing block behind the pipe plug. Remove brass
injector jet (orifice). Replace in reverse sequence.
12.2.3 Solenoid Valve/Governor
Remove the electrode cover from the burner head
and unplug spark and sensor leads. Remove burner
head by unscrewing the two allen screws. Remove
the tagged wires from the burner run neon. Remove
the cross-head screw retaining the valve connec-
tion. Withdraw the connection block. Remove the
ground wire from the gas valve and from the air
shutter screw. The gas train can now be withdrawn
from the compartment. The gas train can now be
dismantled. Replace part and reassemble in reverse
order.
NOTE: When reassembling, a suitable sealant must
be used to ensure that no gas leaks occur. Further
to this, the assembly must be square so that all the
components are upright.
12.2.4 Automatic Flame Control Unit
Remove ignition lead, sense wire and other
connectors. Unscrew two (2) screws from the cover.
Replace if faulty. Refit in reverse sequence.
12.2.5 Neons
Remove the two push connectors from the neon.
Remove the neons by depressing the retaining tabs
inward. Replace in reverse sequence.