Q2 EXHAUST OPERATING MODE
The control can operate the fan(s) in either ‘continuous’ or ‘intermittent’ mode. The mode can be changed via the display.
The display only shows the chosen mode. The mode can be overridden by the dip switches inside the cover on the print
board. If switches are all in ON positions the control will act as there were a call for heat for all appliance at all times. This
will disable pre-purge, post-purge and prime functions. This is a function that is benecial for MODS, MCAS operations
and for testing/troubleshooting.
In ‘continuous’ mode the fan operates continuously. During times when the heating appliance(s) is not operating, the fan
will still operate although at its lowest capacity. Some exhaust will be pulled through the appliance. The chimney is always
primed and there is no real need for pre- and post-purge functions. The energy consumption in this mode is minimal.
In ‘intermittent’ mode the fan only operates if at least one appliance is operating. When no appliance(s) is operating the
fan shuts down. In this mode, pre- and post-purge functions are very important and must be set. This mode oers the low-
est energy consumption.
If a heating system operates constantly, or the time between cycles is very short (less than 5-10 minutes), ‘continuous’
mode should be considered. Otherwise, ‘intermittent’ mode should be selected.
There is no need to set this value, if the control is used to control the supply of combustion air.
If used with a damper actuator, set for ‘continuous’ operation.
Q3 SET EXHAUST PRE-PURGE
When operating in ‘intermittent’ mode it is important to set the pre-purge. Pre-purge is the period from when there is a
call for heat until the control allows the appliance to start assuming the fan is operating at the proper capacity. The setting
can be anywhere from 0 to 1800 seconds.
There is no need to set this value, if the control is used to control the supply of combustion air.
Q4 SET EXHAUST POST-PURGE
When operating in ‘intermittent’ mode it is important to set the post-purge. Post-purge is the period from when the appli-
ance shuts down until the control allows the fan to shut down assuming there are no more products of combustion in the
chimney system. The setting can be anywhere from 0 to 1800 seconds.
There is no need to set this value, if the control is used to control the supply of combustion air.
Q5 SET INTAKE
For setting the room pressure. The lowest possible value is 0.012 inWC. Most applications require a setting of 0.012 inWC.
The %-value indicates the relative setting of the total range of the sensor.
There is no need to set this value, if the control is used to control the draft or exhaust pressure.
Q6 INTAKE OPERATING MODE
The control can operate the fan(s) in either ‘continuous’ or ‘intermittent’ mode. The display only shows the chosen mode.
See also Q2 about the dip switch, which can be very benecial for the supply of combustion air or make-up air, especially
where there are chillers, fans etc. that consume air. In ‘continuous’ mode the supply fan operates continuously. During
times when the heating appliance(s) is not operating, the supply fan will still operate although at its lowest capacity. Some
pressurization of the mechanical room may occur. The room is always primed and there is no real need for pre- and post-
purge functions. The energy consumption in this mode is minimal.
In ‘intermittent’ mode the supply fan only operates if at least one appliance is operating. When no appliance(s) is operat-
ing the supply fan shuts down. In this mode, pre- and post-purge functions are very important and must be set. This mode
oers the lowest energy consumption.
If a heating system operates constantly, or the time between cycles is very short (less than 5-10 minutes), ‘continuous’
mode should be considered. Otherwise, ‘intermittent’ mode should be selected.
There is no need to set this value, if the control is used to control the draft or exhaust pressure.
15
EBC30 3002180 100315
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