Burnham Apex APX399 Installation, Operating And Service Instructions page 100

X. Operation
G. Changing Adjustable Parameters (continued)
Remote
"Press" button to access the following parameters:
4-20mA
Factory range /
Setting Choices
Local,
Local
4-20mA
Local,
Local
4-20mA
80°F -
130°F Central Heat
Setpoint
80°F -
180°F Central Heat
Setpoint
* Only visible when Central Heat Setpoint Source is set to 4-20mA.
Sequence
Master
"Press" button to access the following parameters:
Factory
range / Choices
Setting
Enable,
Disable
Disable
Boiler Boiler Piped,
Piped Primary Piped
Enable,
Disabled
Disable
120 Secs 120 - 1200 Secs
Central Heat
195°F Setpoint,
195°F
50% 50% - 100%
3 1-5
Sequence
"Press" button to access the following parameters:
Slave
Factory
range / Choices
Setting
None 1-8
Use Boiler First,
Normal Normal,
Use Boiler Last
100
Central Heat Modulation Source
This parameter enables the 4-20mA input to control firing rate and the thermostat input to control boiler on/off
demand directly without using the internal setpoint. The 4-20mA selection is used to enable a remote multiple boiler
controller to control the Sage2.1 Control:
Local: 4-20mA Input on Terminal 9 & 10 is ignored.
4-20mA 4-20mA Input on Terminal 9 & 10 is used to control firing Rate % directly.
Central Heat Setpoint Source
Sets the remote (Energy Management System) control mode as follows:
Local: Local setpoint and modulation rate is used. 4-20mA input on Terminal 9 & 10 is ignored.
4-20mA 4-20mA Input on Terminal 9 & 10 is used as the temperature setpoint. The following two
parameters may be used to adjust the signal range.
Central Heat 4-20madc Setup, 4 ma Water Temperature*
Sets the Central Heat Temperature Setpoint corresponding to 4mA for signal input on terminal 9 & 10. Current
below 4mA is considered invalid, (failed or incorrect wired input).
Central Heat 4-20madc Setup, 20 ma Water Temperature*
Sets the Central Heat Temperature Setpoint corresponding to 20mA for signal input on terminal 9 & 10. Current
above 20mA is considered invalid, (failed or incorrect wired input).
Master Enable/Disable
The Sequencer Master Enable/Disable is used to "turn on" the Multiple Boiler Controller. Warning! enable
ONLY one Sequence Master.
indirect Water Heater (iWH)
Boiler Piped Sequencer to respond to an Isolated DHW demand that is piped to a single boiler. The
individual boiler goes on "Leave" from the Sequencer Master and goes to DHW Service.
Primary Piped The Sequence Master responds to the DHW Call For Heat. This allows one or more
boilers to provide heat to the IWH.
DHW Two Boiler Start
The Sequencer to immediately start two boilers for a DHW call for heat. Used when DHW is the largest
demand. Only visible when primary piped IWH is selected.
Boiler Start Delay
Slave boiler time delay after header temperature has dropped below the setpoint minus "Diff below" setpoint.
Longer time delay will prevent nuisance starts due to short temperature swings.
Stop all Boilers Setpoint
When this temperature is reached all boilers are stopped. This setpoint allows the Sequencer to respond to
rapid load increases.
Base Load Common rate
To maximize condensing boiler efficiency, the firing rate is limited to an adjustable value. Boilers are kept at
or below this firing rate as long as the boilers can handle the load. After last available boiler has started, the
modulation rate limit is released up to 100%.
response Speed
This parameter adjusts the Sequence Master 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 "Diff
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.
Parameter and Description
Boiler address
Each boiler must be given a unique address. When "Normal" slave selection order is used, the boiler address
is used by the Master Sequencer as the boiler start order. The boiler address is also the Modbus Address
when a Energy Management System is connected.
Slave Selection Order
"Use Boiler First"; places the Slave in the lead permanently.
"Normal"; firing order follows boiler number (1,2,3,..) order.
"Use Boiler Last"; places the slave last in the firing order.
Parameter and Description
Parameter and Description