101
106308-05 - 3/23
APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
Select to access the following parameters.
Parameter and Description Factory Setting Range / Choices
Response Speed
Adjusts Domestic Hot Water temperature control Proportion Integral Derivative
(PID) values. A higher value causes a larger firing rate change per degree of
requested temperature change. If set too high, firing rate overshoots required value,
temperature exceeds Difference Above, and boiler cycles unnecessarily. A lower
value causes a smaller firing rate change per degree of requested temperature
change. If set too low, firing rate response will be sluggish and temperature will
wander away from setpoint.
3 1 to 5
Proportional Rate
Proportional gain value for Domestic Hot Water temperature control. A higher
value yields tighter, more active, PID control. Proportional Rate is the primary PID
modulation rate tuning adjustment and provides the immediate modulation rate
response. Select value based on desired initial response. If set too high, burner
modulation rate can oscillate.
26 0 to 400
Integral Rate
Integral gain value for Domestic Hot Water temperature control. A higher value yields
faster ramp rate. 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. If set too high, burner modulation rate can oscillate.
9 0 to 400
Select to access the following parameters.
Parameter and Description Factory Setting Range / Choices
Response Speed
Adjusts Sequence Master temperature control Proportion Integral Derivative (PID)
values when boiler is connected in boiler-to-boiler network. A higher value causes
a larger firing rate change per degree of requested temperature change. If set too
high, firing rate overshoots required value, temperature exceeds Difference Above,
and boiler cycles unnecessarily. A lower value causes a smaller firing rate change
per degree of requested temperature change. If set too low, firing rate response will
be sluggish and temperature will wander away from setpoint.
3 1 to 5
Proportional Rate
Proportional gain value for Sequencer Master temperature control. A higher
value yields tighter, more active, PID control. Proportional Rate is the primary PID
modulation rate tuning adjustment and provides the immediate modulation rate
response. Select value based on desired initial response. If set too high, burner
modulation rate can oscillate.
22 0 to 400
Integral Rate
Integral gain value for Sequencer Master temperature control. A higher value yields
faster ramp rate. 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. If set too high, burner modulation rate can oscillate.
7 0 to 400
10 Operation (continued)
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