27
Rev 2.1
the slave’s commanded firing rate. If at least one stage has been dropped, no stage is requested to exceed the
Common Base Load Rate
.
2-12.3 Add Stage Method
Factory default setting for adding a stage is
Error Threshold
method. A stage is added when the error becomes
excessive based on the degrees away from setpoint and time. Add stage condition will occur when the
modulating slaves are at their maximum rate per the rate allocation rules (base load rate or maximum firing rate)
and header sensor is reading below the lead lag setpoint by amount greater than or equal to the
Add Stage Error
Threshold
(Default 5F). Condition will have to continue for
Add Stage Interstate Delay
(Default 30 seconds)
before stage can be added.
2-12.4 Drop Stage Method
Factory default setting for dropping stage is
Rate Threshold.
A drop stage condition will occur when the last
stage is at the minimum modulation rate. Condition will have to continue for
Drop Stage Interstate Delay
(Default 30 seconds) before stage can be dropped.
2-13 System Integrator Display Wiring and Lead Lag Bus Wiring
2-13.1 System Integrator Display Wiring
System operator interface panel will be preassembled from the factory with the 12V power supply. Installer will
need to wire 120VAC and RS-485 communication connections.
Display communication is done over MB1 RS-485 bus on each boiler (MB1 A, B, and C Terminals on
Honeywell Controller). Daisy chain network wiring to MB1 terminals is required if display is used with
multiple boilers.
Содержание A050-A300
Страница 21: ...21 Rev 2 1 Figure 2 4 Suggested Single Fuel Atlas Gas Piping Figure 2 5 Suggested Dual Fuel Atlas Gas Piping ...
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Страница 31: ...31 Rev 2 1 Figure 2 10 One Atlas One Tank Suggest Piping Diagram ...
Страница 32: ...32 Rev 2 1 Figure 2 11 One Atlas Two Tank Piping Diagram ...
Страница 33: ...33 Rev 2 1 Figure 2 12 Two Atlas One Tank Piping Diagram ...
Страница 34: ...34 Rev 2 1 Figure 2 13 Two Atlas Two Tank Piping Diagram ...
Страница 36: ...36 Rev 2 1 Figure 2 15 Two Atlas in Primary Secondary Loop Piping Diagram ...
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