Siemens LMV5 Series Technical Instructions page 188

Technical Instructions
Document No. LV5‐1000
11. The AZL52 will then prompt "when value stable, continue with ENTER". After the burner is at
Point 2, wait at least an additional 30 seconds to make sure that the O
representative of Point 2, then press Enter. Pressing Enter stores the O
point. The value that is stored should be close (+/‐ 0.2%) to the "saved" value that was recorded
for Point 2 during Ratio Control Curve commissioning.
NOTE: It is important to wait long enough to get a steady‐state O
pressed. If in doubt, wait longer for the value to stabilize. Waiting longer than necessary has
no ill effects for the O
NOTE: If the O value displayed on the AZL52 is not steady (oscillating more than +/‐ 0.1% O
2
it is likely that the O
burner / boiler that are affecting the fuel / air ratio. These issues must be corrected before
proceeding.
12. Next, slowly increase the StandardVal number, which reduces the air flow into the burner. The
reading beside O2 Control should start to drop as StandardVal is increased. Note that the Tau
time of the boiler comes into play here, so it may take 10‐15 seconds or more for a change in
the StandardVal number to be seen in the O
13. Once the StandardVal number has been increased enough to get the %O
the O Ratio Control Curve, the point can be stored. This is done by pressing Enter, Escape, and
2
then Enter again.
NOTE: If the Ratio Control Curve point was saved 0.5% O
above), then lowering the %O
point on or very close to the target %O
14. After the point is stored, the delay time at Point 2 (Tau Low‐Fire) will be measured. This should
occur and the AZL52 should state "Measurement Successful, Control Parameters Stored".
15. The rest of the Points (3 thru 10) can now be done in a similar manner. The delay time (Tau
High‐Fire) will also be measured at the high fire point, in this case Point 10.
16. After the delay time is successfully measured at Point 10, escape out of the O
Figures 6‐6 and 6‐7 below for an example of what typical O
curves might look like for this application.
17. If the burner must always be run with either temperature compensation or O
low NOx mesh burners):
a. Limit the low fire to the load number at Point 2. This can be done by setting parameter
MinLoadGas to the load number of Point 2 using the following menu path:
Params & Display > RatioControl > Gas Settings > LoadLimits > MinLoadGas
Section 6 Page 16 SCC Inc.
trim commissioning.
2
sensor is not mounted correctly, or there are other issues with the
2
reading.
2
by 0.5% using the StandardVal should put the O
2
.
2
HOME
value being read is
2
Ratio Control Curve
2
value before Enter is
2
at least 0.5% below
2
above the target %O (see step 3
2 2
Control Curve
2
control curve. See
2
trim curves and Lambda Factor
2
trim (most ultra‐
2
LMV Series
),
2