Operation
3-2
750-437
Q Series Full Modulation
circuit. For optimal efficiency, the controller used should be capable of PID load control. The purge rate, ignition
position, minimum firing rate, maximum firing rate and fuel-air ratio throughout the firing range is determined by
settings made in the Siemens LMV37 display. Refer to the Siemens LMV37 operation manual for further
information.
3.1.3 — Combustion Settings
Fuel and air flow rates are individually adjusted at low fire and at high fire to achieve rated heat input, firing rate
turndown, optimum efficiency, and safe operation. Refer to the nameplate inside the control panel for fuel input
ratings and corresponding manifold pressures.
3.1.4 — Test Equipment
Combustion tests and pressure readings should be conducted on-site and typically requires equipment such as:
•
Combustion analyzer with O2, CO2, and stack temperature indication.
•
U-Tube manometer, or pressure gauge, to measure gas pressure.
•
Manometer to measure draft pressures.
•
Voltmeter/Ammeter.
3.2 — Burner Sequence Overview
Basic overview of the control's normal sequence of operation is provided herein. Refer to the LMV37 manual for
additional sequence-of-operation detail and the burner-wiring diagram to a better understanding of how the
boiler and burner limit devices impact sequence of operation.
3.2.1 — Normal Automatic Sequence of Operation
In automatic operation, the burner cycle proceeds through standby, pre-purge, ignition, main flame operation
(released to modulate and load controller is driving the firing rate), post-purge and return to standby.
During main-flame operation, the burner firing rate is modulated by a load controller in response to the heat
exchanger's pressure or temperature until the operating control* contacts open and end the call for heat.
*operating control contacts may be either an individual operating control device or in a controller which incorporates load controller capability.
The LMV3 operation should be tested when:
• the burner is initially placed into service;
• a control is replaced; or
• the scheduled maintenance program so indicates.
Read the LMV37 manual and fully understand its contents before attempting to operate this equipment. Fail-
ure to observe this warning may result in serious personal injury or death.
!
Warning
Summary of Contents for ProFire Q Series
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Page 18: ...Introduction 1 8 750 437 Q Series Full Modulation...
Page 28: ...Installation 2 10 750 437 Q Series Full Modulation...
Page 50: ...Operation 3 22 750 437 Q Series Full Modulation...
Page 82: ...Troubleshooting 6 24 750 437 Q Series Full Modulation...
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