3223
5
GB
AMULET INSTALLATION INSTRUCTIONS
(Required on some models)
The amulets provided have been selected by Riello to protect the
combustion tube from hot exhaust gases and flame. This protec-
tion may be needed in applications where the combustion tube
opening in the combustion chamber refractory is larger than the
tube outside diameter.
The amulet has been sized to fit Riello Model 40 sizes F3 and F5
plus the Riello Model R35.
When installing this amulet, handle it carefully.
Do not exert undue pressure when pushing the amulet over the
combustion tube.
Excessive force can result in a broken amulet!
If the amulet will not fit easily onto the tube, remove a small amount
of the inner diameter with a sharp knife to provide the necessary clearance.
The diagram below shows the proper position of the amulet after installation.
D7285
Amulet shown in the
flush mounted position
Head receeded
1/4 inch max.
NO AMULET
AMULET
FLUE GASES
FLUE GASES
Tapered combustion
chamber causes increase
in pressure inside
Tapered combustion
chamber causes increase
in pressure inside
HIGH PRESSURE
HIGH PRESSURE
HEAT
HEAT
HEAT
HEAT
Increase in pressure down
air tube due to increase
in combustion chamber
pressure
Increase in pressure down
air tube due to increase
in combustion chamber
pressure
LOW PRESSURE
LOW PRESSURE
AIR TUBE
AIR TUBE
Increase in pressure
down air tube due
to increase in
combustion chamber
pressure
Amulet helps prevent
not gases from
travelling down
air tube
S7941
