Rheem RTG2-42 Troubleshooting Manual page 7

Implementation
Date Affected
December 5, 'dash two'
2006 model
RTG 53/2-42 chassis
July 1, 2008 RTG 66
Models Modification/Upgrade
Flame rod and igniter on
right hand burner swapped;
added a 'target' for the
spark to hit
Improved burner cover plate Burner cover
New programming chip –
all RTG74 models. The new
burner plate cover modified
the air flow characteristics.
This means the chip
programming had to
change.
RTG 74 chassis only
Removed transformer. 120v
AC is the primary power
source to board
Manifold pressure changed
Programming chip changed
to reflect new manifold
pressures
Moved gas inlet connection
to outside the chassis for
easier replacement
New igniter | New wire
harness for igniter | New
location
Direct Vent model only;
altitude configured via dip
switch settings; inlet gas
pressure check port added
SVC 810 Tankless Troubleshooting Manual
New Parts
Burner
plate
Programming
Chips; this is
when the 2
chips in a bag
started.
Yes
No
No
Programming
Chips
No
Yes
Many
6
Board
Programming
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes