LMV Series Technical Instructions
Document No. LV3-1000
SCC Inc. Page 3 Section 4
d. Ensure environmental conditions (temperature, vibration, moisture, etc.) are not
exceeded.
3. Ensure that all wiring is per the applicable wiring diagram and also meets applicable local and
national codes. Particular attention should be paid to the following:
a. If a step-down control transformer is the source of 120 VAC power for the LMV3, the
ground and neutral should be bonded (connected) on the transformer.
b. Voltage supply to a 120 VAC LMV3 must be between 102 and 132 VAC, 47-63 Hz.
Waveform must be a full sine wave.
4. Fuel (gas) supply must be adequate to support high fire operation and fuel (gas) train must be
sized correctly.
a. Fuel (gas) pressure before the firing rate control valve must be correct, stable and
repeatable at all firing rates and must not vary when other fuel (gas) burning appliances
(other boilers in the building) are being operated.
b. The fuel (gas) pressure regulator on the burner being commissioned should not be fully
open at high fire and should not be bouncing off the seat at low fire. Fuel regulator
must be sized properly, and have adequate turndown capability.
5. A temporary stack gas analyzer that has been calibrated and at a minimum reads O
2
(%) and CO
(ppm) must be used for setting combustion.
6. Knowledge of what fuel flow represents high fire of the burner / boiler combination and also the
turndown of the burner / boiler combination. This can typically be found on the burner / boiler
nameplate.
7. A method of determining firing rate (fuel flow within +/- 5%) should be used. This, in
combination with knowledge of high fire and turndown, is used to set the fuel flow on each
curve point. An Excel spreadsheet is available for this purpose.
8. For steam boilers, the feedwater supply must be adequate to support high fire operation.
Feedwater controls must be working properly.
9. The load on the boiler must be adequate so that a burner / boiler combination can be run at
high fire for a minimum of 5 minutes.
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