Rheem Raypak AVIA 264 Installation And Operation Manual page 41

Orifice Removal
1. Locate and close the external manual shutoff valve.
2. Loosen the external gas union.
3. Locate and remove jacket top.
4. Locate and remove the four (4) bolts & nuts holding
the gas orifice in place. See Figure 64.
5. Carefully remove the gas orifice and do not misplace
the O-rings attached to the flanges.
6. Inspect and/or replace the orifice with the correct
size.
BRACKET
O-RING
Figure 64. Orifice Location
Gas Orifice Selection
Use Table R for the right gas orifice selection. Propane
orifices can be identified by the black paint on the edges.
The notches should face up for easy identification.
The gas orifice is located on the gas train, between the gas
valve and the combustion blower.
NOTE: Gas orifices for propane gas have a black oxide
finish.
Figure 65. Gas Orifice
GAS ORIFICE
Pockets /
Model
Notches
1 264
2 404
1 264
2 404
Table R. Gas Orifice Selection
Igniter Removal
.
1. Remove top cover.
2. Disconnect spark cable from igniter.
3. Use M10 socket, remove the two nuts holding the
igniter.
4. Carefully remove igniter and gasket.
5. When replacing igniter, be sure to add a new gasket
when installing igniter.
.15 +/- .01
Figure 66.
Burner Removal
1. See "Combustion Blower Removal" steps below.
Must remove blower to reach the burner.
2. Once the blower is removed. Use an M10 socket to
remove (16) nuts holding down the burner.
3. Be sure to install a new gasket before installing the
burner.
Gas Type Finish
Natural None
Propane Black
Igniter
41