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10
Operation
(continued)
12. Sequencer Slave
Select
to access the following parameters.
Boiler Address
Each boiler must be given a unique address. When Slave Selection Order is set to
Use Normal Order, the boiler address is used by the Sequence Master as the boiler
start order.
Slave Selection Order
First
Boiler will always be first to start.
Normal
Boiler start order follows boiler address number.
Last
Boiler will always be last to start.
13. Limits
Select
to access the following parameters.
Stepped Modulation Start Offset
Reduces firing rate when supply, differential, or stack temperature is Stepped
Modulation Start Offset degrees below the high limit setting to help avoid lockouts.
For example, when the setting is 20°F, maximum modulation rate will begin to be
reduced when stack temperature is 20°F below the Stack High Limit and will be at
minimum modulation when stack temperature is 10°F below the limit.
Note: Feature is only active for supply temperature when Header Sensor is selected
as modulation sensor, when a boiler is a slave, or when a boiler is responding to a
remote demand (4-20mA or Modbus).
Stepped Modulation Recycle Offset
Recycles boiler when supply, differential, or stack temperature is Stepped
Modulation Recycle Offset degrees below the high limit setting to help avoid
lockouts. For example, when the setting is 10°F, the boiler will recycle when
temperature is 10°F below the limit.
Note: Feature is only active for supply temperature when Header Sensor is selected
as modulation sensor, when a boiler is a slave, or when a boiler is responding to a
remote demand (4-20mA or Modbus).
Preferred Supply High Limit
Adjustable high limit for supply temperature. Adjustable only up to control maximum
value.
Note: Included to allow installers and inspectors to test the limits.
Preferred Stack High Limit
Adjustable high limit for stack temperature. Adjustable only up to control maximum
value.
Note: Included to allow installers and inspectors to test the limits.
106308-05 - 3/23
Parameter and Description
Parameter and Description
APEX
Installation, Operating, & Service Instructions
Factory Setting
None
Normal
Factory Setting
20°F
(-6.7°C)
10°F
(-12.2°C)
210°F
(98.9°C)
204°F
(95.6°C)
Range / Choices
1 to 8
First
Normal
Last
Range / Choices
(Stepped
Modulation
Recycle Offset
+6°F) to 30°F
10°F to (Stepped
Modulation Start
Offset - 6 °F)
60 to 210°F
(16 to 98.9°C)
150 to 204°F
(65.6 to 95.6°C)
99
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