39
®
4.
If standby water temperature is less then its cut in value and the lead or lag steam pressure above
its cut in value, then the boiler will operate according to the standby water parameters.
In Figure 14, whenever the boiler water temperature is above 190F (Cut out point), the Operating
Control Output of the BurnerLogix is open. When the boiler water temperature falls to 180F (Cut in
point), the Operating Control Output closes and a burner start-up sequence will be initiated. The
BurnerLogix will modulate the firing rate damper motor based on boiler water temperature until the
temperature rises above 190F (Cut out point).
FIGURE 14.
STANDBY THERMAL SHOCK PROTECTION MODE:
To program the BurnerLogix to control a steam boiler in the “Standby Thermal Shock Protection
Mode” to perform thermal shock protection by monitoring the boiler water temperature instead of
steam pressure, the user programs the following setpoints which are found under AUX1 SET-
POINTS:
AUX1 USE
: The temperature sensor connected to the
AUX1
input will be used to monitor the boiler
water of a steam boiler. Program this setpoint to
STNDBY WTR
. See GETTING STARTED -
SELECT AND PROGRAM THE PRESSURE AND TEMPERATURE SENSOR RANGES section.
After programming the AUX1 for STNDBY WTR selecting the appropriate temperature sensor,
350F or 752F, the following setpoints also need to be programmed: STANDBY STPT, CUT IN,
CUT OUT
, and
MOD RNG
.
Note: Once AUX1 CONFIG is programmed for STNDBY WTR, all THERMAL SHOCK setpoints
will be set to temperature. If thermal shock is to be used, these setpoints must be properly pro-
grammed by the installer or operator. Refer back to the section discussing Thermal shock operation.
LOW
FIRE
BOILER WATER TEMP. OF STEAM BOILER
150
160
170
200
HIGH
FIRE
100%
20mA
0%
4mA
180
190
FOR LAG MODE OPERATION:
AUX 1 USE = STANDBY WTR
STNDBY STPT = 180
o
F
CUT IN = 0
o
F
CUT OUT = 10
o
F
MOD RNGE = 20
o
F
Setpoints for
Lag Mode
operation
BOILER
FIRING
RATE MOTOR
Содержание BurnerLogiX BLL510
Страница 79: ...79 NOTES...
