Maintenance
5-26
750-382
CBT
S.2. Anti-short cycle
time is too long
Check anti-short cycle
time
Reduce ant-short cycle
time parameter; set to
0 to disable this func-
tion. Anti-short cycle is
located in the "Steam
Configuration" parame-
ter group.
Boiler cycles on and off
too frequently
T. Demand: Steam
Burner state: Standby
(normal)
T.1. Steam Off hystere-
sis setting is too low
Check Steam Off point
on boiler status screen
Increase the Steam Off
point hysteresis param-
eter setting to allow
boiler to modulate lon-
ger before shutting off.
T.2. PID gains are too
aggressive, or too high
Check P (proportional)
and I (integral) gain
settings.
Reduce the gain values
for both P and I gain.
Observer control of
boiler to meet steam
pressure set point.
TABLE 5- 2. Common abbreviations
WD Wiring Diagram
ILK Safety InterLock circuit (always require a manual reset)
LCI Limit Control Input circuit (resets automatically)
SP Set Point (steam pressure)
PID Proportional-Integral-Derivative (control method)
SSOV Safety Shut-Off Valve
FW Feed Water
LWCO Low Water Cut-Off
ALWCO Auxiliary Low Water Cut-Off
CAPS Combustion Air Proving Switch
LGPS Low Gas Pressure Switch
HGPS High Gas Pressure Switch
HLC High Limit Control (steam pressure)
OLC Operating Limit Control (steam pressure)
LED Light Emitting Diode (common on solid state controls, such as LWCO)
AC or VAC Alternating Current (electrical power) or Voltage AC
DC or VDC Direct Current (electrical power) or Voltage DC
RPM Revolutions Per Minute (combustion air fan speed or firing rate)
DIN electrical connector type defined by German standards association
UV Ultra-Violet (flame scanner type)
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures
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