750-96 (revised 2010)
Model CB Packaged Boiler Manual
7-5
7.6 — Program and Flame Safety Control
FIGURE 7-2. Fuse Sizes Chart
7.6 — Program and Flame Safety Control
This control requires no maintenance since it is a microprocessor system with safety and logic timings that are
inaccessible. Neither are there any accessible contacts. Do check to see that the retaining screw is securely hold-
ing the chassis to the mounting base. Also check to see that the amplifier and the program module are tightly
inserted.
The relay’s self-diagnostic ability includes advising when it or its plug-in modules are at fault and require replace-
ment.
In areas of extreme high humidity, your spare control should be stored in a dry atmosphere. During an extended
shutdown (e.g., seasonal), the active control should be removed and stored. Moisture can cause problems.
It is recommended that service be rotated between the active and a spare control to assure having a working
replacement.
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