Section 13: Servicing Instructions; Annual Procedure; Sealing Gaskets; Component Removal - Roberts Gorden AG15ST Installation, Operation & Service Manual

®
B AG I
LACKHEAT NSTALLATION

SECTION 13: SERVICING INSTRUCTIONS

DANGER
Electrical Shock Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.
Failure to follow these instructions can result in death, electric shock, injury or property damage.
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 carrying component.
On completion of any service/fault finding tasks which
require the breaking and remaking of electrical
connections, the checks:- A: Earth Continuity, B: Polarity
and C: Resistance to Earth must then be repeated.

13.1 Annual Procedure

Carry out the following 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, more frequent
service may be necessary.
13.1.1 Burner and Fan Removal
Isolate the heater from the gas and electrical supplies.
Remove the fan plug from the burner. Unscrew the
securing screws on the burner flange. The burner can
now be removed. Take care not to disturb the gasket on
the flanged burner tube. Unscrew the securing screw on
the fan flange spigot. The fan can now be removed.
13.1.2 Burner and Fan Removal Maintenance
Remove the fan and burner independently to floor level
and clean both items internally using a soft brush and
compressed air, if available. Take care not to damage the
internal parts of the burner. Check fan impeller for
cleanliness and free rotation.
The electrodes are an integral part of the burner. To
check spark gap, remove the securing screws on the
electrode and withdraw it ensuring the gasket is not
damaged. Spark gap on electrode should be
approximately 3 mm.
13.1.3 Tube and Reflector Maintenance
With burner and fan removed, clean the outer surfaces of
the tubes using a brush and wipe the inner surface of the
reflector with a soft damp cloth - use a household
42
O S M
PERATION AND ERVICE ANUAL
Explosion Hazard
Turn off gas supply to
heater before service.
WARNING
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
detergent if necessary. Never use abrasive cleaners on
the reflectors. Reassemble the burner and fan in reverse
order. Carry out the Testing Procedure. See Page 41,
Section 12.2.

13.2 Sealing Gaskets

During annual service, all gaskets, as indicated on Page
49, Section 15, must be inspected for cuts, misalignment
or dryness. All round rubber gaskets, sealing the screw
holes, must be replaced in three year intervals or earlier
as needed. All other gaskets must be replaced every five
years or earlier as needed.
Old gaskets must be removed completely before installing
the new gasket. When replacing gaskets on screws,
ensure that the screws are not over tightened.
Deformation of the gasket is an indication of suffcient
torque. The control and combustion chamber doors have
internal seals, replacements must be attached to the
same location.

13.3 Component Removal

First, isolate the heater from the gas and electricity
supply.
Entry to the burner assembly is gained by removing the
six door screws and removing the control chamber door.
Entry to the combustion chamber is gained by removing
the combustion chamber door.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.