Appendix A: General Maintenance (continued)
Flue Probe Integrity Check
NOTE: Perform this check after performing the Pump Operation Check outlined
on the previous page.
1. Turn the analyzer on as outlined on page 8. Do not connect anything to the
inlet. Wait until the analyzer has completed the initial purge and sensor check
and is operating normally prior to proceeding to step 2.
2. Connect the A763 mini pump protection filter and flue probe assembly to the
inlet of the analyzer.
3. Cover the end of the flue probe with a small piece of tube and pinch the end
close. After a short period of time the analyzer should display “FLO ERR” and a
rapid beeping should be heard. If this happens the flue probe his operating
properly and the integrity test is complete. If the analyzer does not display “FLO
ERR” this is an indication of a possible leak somewhere in the flue probe and
you may proceed to the next step for further tests.
5. Pinch the hose below the handle of the flue probe. If the analyzer displays
“FLO ERR” there is a leak in the handle assembly and the probe needs to be fac-
tory serviced. If the analyzer does not display “FLO ERR” proceed to the next
step for further tests.
6. Pinch the hose between the analyzer and the water trap. If “FLO ERR” still
does not display there may be an internal leak, pump problem, or other issue
and the analyzer needs to be factory serviced. If “FLO ERR” is displayed there is
a leak in the water trap assembly and the water trap assembly should be
checked as outlined on page 39 & 40.
31
Appendix A: General Maintenance (continued)
Filter Check Continued
The other two filters are located in the water trap. The main filter is the A794F
particle filter. This filter stops debris and dust from traveling down to the analyz-
er. The secondary filter is the A794W water block filter. This filter stops flow in
the event the water trap fills with condensate. Refer to the picture below.
Open the water trap and look at the A794F particle filter. The filter will typically
get dirty from the inside first. If the filter is dark on the inside a replacement fil-
ter should be installed.
If the A794F is clean but saturated with water a replacement should be installed
to ensure proper flow. The saturated filter can be left to dry and reused later.
Pump Operation Check
1. Turn the analyzer on as outlined on page 8. Do not connect anything to the
inlet. Wait until the analyzer has completed the initial purge and sensor check
and is operating normally prior to proceeding to step 2.
2. Cover the analyzer inlet with your finger. The analyzer should display “FLO
ERR” and a rapid beeping should be heard.
If the analyzer does not beep and display “FLO ERR” this may be an indication
the flow sensor requires calibration, the pump is faulty, or there is an internal
leak. The analyzer should be returned for factory service.
Water trap bowl. A794
water trap pictured. A795
water trap is similar but
longer
A794F
Particle Filter
A794W
Water
Block Filter
Water trap lid. O-ring is
located in the lid recess
A794D Filter
Spacer Disc
30
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