Fireye BurnerLogiX BLL510, Manual, Page: 38 / 80

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ture sensor (P/N TS350-2, -4, or -8 or TS752-2, -4, or -8) on the steam boiler, connect it to the
AUX1 input, and program the sensor to operate in the STNDBY WTR mode.
STANDBY LAG MODE
To program the BurnerLogix to control a steam boiler in the “Standby Lag Mode”, the user programs
the following setpoints which are found under
AUX1 CONFIG>:
STNDBY WTR : This selects the temperature sensor connected to the AUX1 input terminals will be
used to monitor the boiler water of a steam boiler and programmed to operate in the STNDBY WTR
mode. See GETTING STARTED - Select and Program the Pressure and Temperature Sensor Ranges
section.
STNDBY STPT (Water Temperature Setpoint): This determines the boiler water temperature the
BurnerLogix will maintain.
CUT IN (Cut In Value): Determines the point in which the boiler water temperature must reach to
close the operating control. This is a differential value that is subtracted from the water temperature
setpoint ( WTR SP ).
CUT OUT (Cut Out Value): Determines the point in which the boiler water temperature must reach
to open the operating control. This is a differential value that is added to the water temperature set-
point ( WTR SP ).
MOD RNG (Modulating Range): This determines the range of boiler water temperature in which the
firing rate motor is commanded from its low fire to its high fire position.
The Standby mode of operation is similar to the operating control and modulating control functions.
See SEQUENCE OF OPERATION - OPERATING CONTROL and SEQUENCE OF OPERATION
-MODULATING CONTROL sections.
When AUX1 is configured to be used as standby water, both lead or lag pressure and temperature
inputs are monitored continuously with steam pressure having priority. Because both steam and
water are active inputs, the BurnerLogix will operate the burner in the following manner:
1.
While the standby water temperature is above its cut in point, the lead or lag steam pressure cut
in point is monitored.
2.
If the standby water temperature is above its cut in point and the lead or lag steam pressure is
below its cut in point, the burner will operate and control according to the steam pressure set-
points.
3.
If the standby water temperature is less than its cut in point and the lead or lag steam pressure is
less than its cut in point then:
a. If thermal shock is active and the standby water temperature is less than the thermal
shock exit point, the boiler will be controlled according to the thermal shock setpoints
(temperature).
b. If the standby water temperature is above the thermal exit point, the boiler will be
controlled according to the lead or lag steam pressure setpoints.
c. While the boiler is firing and the standby water setpoint is satisfied and if the steam
pressure is below its setpoint then control is switched to the lead or lag steam
pressure parameters.
WARNING: Location of the boiler water temperature sensor is critical in the operation of
Standby Water. Consult the boiler manufacturer for guidance for its location or refer to
Bulletin TS-3501 for proper location and wiring of this temperature sensor.
CAUTION: Programming the AUX 1 USE for STANDBY WTR automatically converts all
of the setpoints associated with the operation of Thermal Shock Protection to UNUSED. See
SEQUENCE OF OPERATION- COLD START THERMAL SHOCK PROTECTION sec-
tion to set these values properly.