Boiler Control Instruction & Operation Manual, Rev 1
Page
36
of 64
Setup & Tuning
Parameter Adjustment
WARNING
Asphyxiation Hazard. Boiler type is factory set and must match the boiler model. Only change the boiler type
setting if you are installing a new or replacement Control. The boiler type setting determines minimum and
maximum blower speeds. Incorrect boiler type can cause hazardous burner conditions and improper operation that
may result in PROPERTY LOSS, PHYSICAL INJURY OR DEATH.
Modulation Configuration
Factory
Setting
Range /
Choices
Parameter and Description
Model
Dependent
Minimum to
Maximum
Modulation
Central Heat Max Modulation Rate
This parameter defines the highest modulation rate the Control will go to during a
central heat call for heat. If the rated input of the installed radiation is less than the
maximum output of the boiler, change the Central Heat Maximum Modulation (fan
speed) setting to limit the boiler output accordingly.
100%
Minimum to
Maximum
Modulatio
n”
Domestic Hot Water (DHW) Max Modulation Rate
This parameter defines the highest modulation rate the Control will go to during a
Domestic Hot Water call for heat. If the rated input of the indirect water heater is less
than the maximum output of the boiler, change the DHW Maximum Modulation (fan
speed) setting to limit the boiler output accordingly.
Model
Dependent
Minimum
+ 100 to
Maximum -100
Minimum Modulation Rate
This parameter is the lowest modulation rate the Control will go to during any call for
heat.
0 Min
0 to 30 Min
Central Heat & Domestic Hot Water Forced Rate 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 & Domestic Hot Water Forced 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.
11 (ºF)
(Stepped
Modulation
Recycle Offset
+ 6)
to 30
Stepped Modulation Start Offset
Stepped Modulation is provided to help the boiler continue to supply heat when
temperatures are beginning to approach Limits. This feature helps avoid manual reset
and soft lockouts by reducing the firing rate when the temperature i
s “Stepped
Modulation Start Offs
et” degrees below the Limit setting. For example, when the setting
is11 F the maximum modulation rate will begin to be reduced when stack temperature is
11 F below the Stack Limit and will be at minimum modulation when stack temperature
is 5 F below the limit.
Supply Temperature (High Limit 210 F) (see
Note
below),
Differential Temperature (Differential Temperature Limit 100 F),
Stack Temperature (Stack Limit 230 F),
Note
: This feature is not active for Supply temperature when it is the modulation sensor.
For example, this feature is active when Header Sensor is selected as modulation
sensor, when a boiler is a slave, when a boiler is responding to a remote modulation
demand (4-20mAdc or Modbus).
NOTE:
Maximum Modulation Rates are designed for 100% nameplate rate at 0°F (-18°C) combustion air. Contact
factory before attempting to increase the Maximum Modulation Rate