Boiler Control Instruction & Operation Manual
Page 4
4
of
68
Setup & Tuning
Press
Tune
to access the following menus.
Press
Central Heat
Tuning
within the Tune menu to adjust the following parameters
Factory
Setting
Range /
Choices
Parameter and Description
3
1 to 5
Response Speed
This
parameter
adjusts the Central Heat temperature controller Proportion Integral
Derivative (PID) values. Higher values cause a larger firing rate change for each
degree of temperature change. If set too high firing rate
“overshoots” required value,
increases to high fire causing the temperature to exceed the
“Difference Above”
setpoint and cycle the boiler unnecessarily. Lower values cause a smaller firing rate
change for each degree of temperature change. If set too low, the firing rate response
will be sluggish and temperature will wander away from setpoint. Refer to
Table 11
for PID values used by these selections.
44
0 to 400
Proportional Rate
Proportional Gain value for Central Heat control modes. A larger gain value results
in tighter, more active, PID control. Gain is the primary PID modulation rate tuning
adjustment and provides the immediate modulation rate response. Pick a gain
based on the desired initial response. The burner modulation rate can oscillate if the
Proportional Gain is too large.
45
0 to 400
Integral Rate
Integral gain value For Central Heat control Modes. A larger value makes the Integral
ramp in less time (i.e., faster). Integral is a secondary PID modulation rate tuning
adjustment that ramps the output over time (typically minutes). Based on the selected
Local PID P, select the corresponding (from above table) Integral value. Repeats per
minute between 0.5 and 2.0 are typical. The burner modulation rate can oscillate if
the Integral time is too large.
0 min
0 to 30 min
Central Heat Low Fire Hold Time
“Low Fire Hold Time” is the number of seconds the control will wait at low fire
modulation rate before being released to modulate. After ignition and flame
stabilization periods the firing rate is held at low fire for
“Low Fire Hold Time”.
This delay allows heat to travel out to the system and provide system feedback
prior to the control modulating firing rate.
1200 RPM
1200 to 1300
RPM
Central Heat Low Fire Hold Rate
“Low Fire Hold Rate” is the modulation rate the boiler will fire at for the duration
of the
“Low Fire Hold Time” before being released to modulate. After ignition
and flame stabilization periods the firing rate is held a
t “Low Fire Hold Rate” for
“Low Fire Hold Time”. This delay allows heat to travel out to the system and
provide system feedback prior to the control modulating firing rate.
