Appendix B:
A773 SULFUR FILTER INSTALLATION & MAINTENANCE
4. Beginning on the “Flue Probe” side of the A773 sulfur filter, pull the yellow
thermocouple cord out of the channel of the flue probe tube. Pull out approx-
imately the length of the water trap that was removed.
5. Being careful not to cut the yellow cord, cut out a section of the flue probe
tubing the length of the water trap on the “Flue Probe” side of the A773 sul-
fur filter. (See picture below)
6. Install the water trap in the flue probe hose where the piece was cut out. Make
sure the water trap is positioned correctly. The water trap lid should face the
“Hose End” side of the hose.
A773 SULFUR FILTER MAINTENANCE:
The A773 should be replaced when most of the pellets become discolored, usual-
ly white or black.
If the A773 begins to trap condensate and fill with water but the pellets are not
discolored to the point replacement is required, it should be removed and allowed
to dry. Once it is dry it can be reused.
33
Appendix B:
A773 SULFUR FILTER INSTALLATION & MAINTENANCE
When performing combustion tests on oil fired equipment it is important to
use the optional A773 sulfur filter. Failure to do so can result in incorrect and
readings. This filter also protects the sensors from the affects of sulfur. The
A773 does not have to be removed when working with other types of fuels.
PROCEDURE
1. Begin with the water trap section of the flue probe oriented as shown in the
picture below.
2. Remove the water trap from the flue probe hose. (See picture below)
3. Insert the A773 sulfur filter flue probe tube where the water trap was
removed..
32
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