32
®
and make change to AUTO. If currently in MAN mod and at MOD POS screen, press the
RESET/MDFY key and either the NEXT or BACK key to manually change the current firing
rate position. The firing rate motor will move while the NEXT or BACK keys are depressed.
When complete, press the RESET/MDFY key to save the position. Pressing the MODE key will
move the display to the top of the BurnerLogix Main menu screen and then to the ALL-INFO
screen.
The BurnerLogix system has
bumpless
transfer. If the burner is at the
AUTO
position and the current
modulating mode is changed from
AUTOMATIC (AUTO)
to
MANUAL (MAN)
mode,
MOD
POS
will assume the value of the current firing rate position. The operator can change the position to
any value through the
MOD POS
option that follows the MOD USE option in the menu. On the sub-
sequent burner cycle, the firing motor will move to the saved MOD POS value when it gets to
AUTO
.
SEQUENCE OF OPERATION - MARGINAL AND HIGH ALARM LIMITS
The PCV, AUX1 and AUX2 sensors installed with the BurnerLogix provide both high marginal
alarm and high limit alarm functions. The marginal limit can be used to provide an indication that the
sensor value is approaching the high alarm limit before the alarm limit is actually reached. For exam-
ple, a Marginal Stack Alarm may be an indication of the burner overfiring, fouled heat exchanger,
tube leak in heat exchanger, etc.
The user can program both high marginal and high limit alarm setpoints for the temperature or pres-
sure sensors based on the input signal received. If the temperature or pressure exceeds the marginal
high limit for 4 seconds, the alarm output relay will be activated, and the system will remain on line.
If the temperature or pressure high limit alarm is exceeded the BurnerLogix will proceed to lockout
requiring manual reset.
The marginal high setpoint cannot be set higher than the high limit alarm setpoint nor can either be
set lower than the sum of setpoint (STPT) plus cut out (CUT OUT). Alarm points for stack monitor-
ing can be set anywhere within the sensor range to meet the application. The marginal high limit and
high limit alarm setpoints are shown on the display as MRGNL ALM and LIMIT ALM respectively.
SEQUENCE OF OPERATION - COLD START THERMAL SHOCK PROTECTION
Cold Start Thermal Shock Protection is designed to slowly increase the burner firing rate on a cold
start to limit mechanical stress due to thermal differences. The BurnerLogix offers two methods of
thermal shock protection: Low Fire and Segment. Thermal shock parameters are found in the
BOILER PARMS menu in the THERMAL SHK CONFIG sub-menu. The setpoints associated with
selecting this function are:
IMPORTANT: In the event the Primary Control Variable (PCV) pressure or temperature
transducer fails in such a manner as to output less than 4 mA or becomes disconnected, the
BurnerLogix Z system will immediately shutdown and proceed to lockout with the message
PCV UNDER RANGE displayed. However, as boiler output is critical, and a replacement
transducer may not be immediately available, the user may continue to operate the boiler if
MOD USE is placed in the MANUAL position and the control is reset from lockout. The fir-
ing rate position can now ONLY be manually controlled until a replacement transducer is
located and installed. The user must be cautioned the BurnerLogix Z system has no way of
knowing the operating pressure of temperature and it is up to the user to limit the output of
the boiler.
WARNING: The electro-mechanical steam pressure or water temperature high limit switch
MUST remain in the running interlock circuit (3-P).
WARNING: Programming a sensor range that is different from the actual range of the
installed sensor could result in improper operation.
Содержание BurnerLogiX BLL510
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