Boiler Control Instruction & Operation Manual
Page
40
of
68
Setup & Tuning
Parameter Adjustment
Factory
Setting
Range /
Choices
Parameter and Description
3
1 to 5
Domestic Hot Water Response Speed
This parameter adjusts the Domestic Hot Water 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.
0 Min
0 to 30 Min
Domestic Hot Water Low Fire Hold Time
“Low Fire Hold Time” is the number of minutes 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
Domestic Hot Water 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 at
“Low Fire Hold Rate” for “Low
Fire Hold Tim
e”. This delay allows heat to travel out to the system and provide
system feedback prior to the control modulating firing rate.
Demand:
DHW Switch
Modulation:
Outlet
Sensor
Demand:
DHW Switch
Modulation:
Outlet Sensor
Demand:
DHW Sensor
Modulation:
DHW Sensor
Domestic Hot Water Demand/Modulation
Domestic Hot Water Demand may respond to the boiler
’s DHW Switch or DHW
Sensor.
When
“DHW Switch/Outlet Sensor” is selected the boiler responds to a domestic
hot water demand when a DHW Switch is sensed at J9 terminal 1 & 2 and is fired
in response to the Outlet Sensor.
When
“DHW Sensor/DHW Sensor” is selected the boiler responds to a domestic
hot water demand when the DHW Sensor, temperature measured at J9 terminal 1
& 2 is below the
“DHW Setpoint” less “Difference Below” and is fired in response to
the DHW Sensor.
Press
Outdoor Reset
to adjust the following parameters.
Figure 20:
Reset Curve
