43
Menu item
Value
Description
HEAT LOSS
0.0%
Used to calculate boiler efficiency. Percentage of boiler
output lost through the shell of the boiler at high fire. The
default is 0% and ranges to 9.9% in 0.1% increment. The
PPC4000 will calculate the heat loss at all firing rates and
is dependent on burner turndown ratio.
TURNDOWN RATIO
3
Used to determine amount of heat loss at all firing rate
positions. Calculated value is subtracted from gross
efficiency. Default is 3 with a range of 1 to 10 and an
increment of 1. A value of 1 will result in a constant heat
loss across all firing rate values.
TRANSPORT DELAY
0s
The range is 0 to 60s. The default is 0s. This is the amount
of time it takes for a step change in O
2
to be realized after a
step change of air/fuel is made. Transport delay value
should be calculated or derived at lowest air velocity (Low
Fire)
TRIM TYPE
AIR
Default selection is AIR trim. As trimming the FUEL servo
is more sensitive than trimming the AIR servo, the user
should be cautious when selecting FUEL trim.
FUEL
TRIM LIMIT RATIO
1
Trim limit ratio is used in determining trim limit. The range
of value is 1 to 8 with the default value being 1. See section
titled SETTING TRIM LIMITS.
TRIM LIMIT
DEFAULT
Applies to degrees of trim at low fire. Selecting DEFAULT
will implement a trim limit of 0.1 degrees at low fire.
MANUAL allows users to enter trim limit at low fire for each
profile assigned. See section titled SETTING TRIM
LIMITS.
MANUAL
TRIM LIMIT (X)
0.1
Parameter shown if TRIM LIMIT is set to MANUAL. The
term (X) refers to profile assignment. The range of trim limit
allowed is 0.1 to 3 degrees in 0.1 degree increments. See
section titled SETTING TRIM LIMITS.
TRIM P-GAIN (X)
6%
Sets the proportional gain term. The higher the gain term
is, the more aggressive the O
2
trim. The range of value is 0
to 100% where 100% is maximum gain. Care should be
used when selecting this term.
TRIM I-GAIN (X)
95
Sets the integral gain term and is the amount of error signal
being fed back. The maximum value is 100% and a faster
rate of integration (resets per minute) is realized. The
range is 0- to 100%.
O2 FAULT ALM
WARNING
Default value is WARNING and pertains to faults detected
in the O2 probe. WARNING will disable O2 trim and burner
operation will default to commissioned air and fuel servo
settings. A LOCKOUT selection will cause burner
shutdown with the lockout message recorded to fault
history.
LOCKOUT
O2 LEVEL ALM
UNUSED
Action that takes place if programmed O
2
levels are
exceeded. UNUSED is no action taken. WARNING is
alarm energized, burner remains on line. LOCKOUT
results in burner shutdown and message recorded to fault
history.
WARNING
LOCKOUT
