5. Startup and conguration
5.1 Sequence of operation
The exodraft EBC30 initializes when 120 V AC power is supplied. It checks for the presence of integrated components such
as add-on boards and pressure sensors. The control does not detect variable frequency drives or damper actuators.
y The software version is displayed on the LED screen
y The control checks for intake and exhaust application by sensing current drawn by an intake or exhaust XTP prop-
erly connected.
y It then displays Found or Not Found for Exhaust and Intake modes
y The control checks for any add-on modules and displays Relay Found,Triac Found, or Nothing Found.
y The EBC30 system application is displayed as intake only, exhaust only, or intake and exhaust.
y The dierential pressure reading will be (+) or (-) in reference to the type of pressure being maintained. The pres-
sure reading will be displayed to the hundredths decimal place.The display reads ‘NOT USED’ when an XTP sensor is
not connected.
Intermittent operation
In intermittent operation, both AUX INPUT and AUX RELAY connections are made between each appliance and the EBC30.
This allows the control to start and stop the fan when an appliance is attempting to re, and to prevent the appliances
from operating if proper draft is not met.
y The EBC30 initiates pressure control when a voltage signal from any of the six appliances is sensed at the AUX
INPUT terminals. No electrical path connects the AUX INPUT terminals so no current passes between them. The LED
between the AUX INPUT terminals lights when a call for heat voltage is sensed.
y The Control sends a 100 % output to the controlled fans in the system via the fan control module for 120 V AC fans
or the VFD1 (exhaust) or VFD2 (intake) 0-10 V DC outputs for 3 phase fans controlled by Variable Frequency Drives.
y The Ashcroft XTP pressure transducers sense the draft between the exhaust stack and the room or between the
outsideair and the room and send a 0-10 V DC signal back to the XTP1 (exhaust) or XTP2 (intake) terminals.
y The current pressure reading is displayed on the EBC30. It displays INT or EXH then the pressure reading or both if
the application is Intake and Exhaust.
y The DRAFT INPUT terminals must be closed by an external Proven Draft Switch or by a manually installed jumper
before any appliances are allowed to operate.
y The AUX RELAY contacts will close only for the appliances that are calling for heat when draft set point pressure is
met and DRAFT INPUT is closed. When the AUX RELAY closes, the LED between the terminals will light and the ap-
pliance will be permitted to operate normally.
y The EBC30 will individually close the AUX RELAY contacts for other appliances as they call for heat via their AUX
INPUT connections while proper draft is maintained.
y The AUX RELAY contacts will open for individual appliances if their AUX INPUT voltage is lost, or open all AUX RE-
LAYS if the draft is not met or no appliance calls for heat.
The EBC30 modulates draft pressures by increasing or decreasing the fan speed in response to changing pressure signals.
The pressure shown on the display is always in inches of water column of relative vacuum draft.
The exhaust fan increases speed to increase the draft felt by the appliances. The intake fan increases speed to decrease
the draft read on intake only systems. Fan speed is controlled by the 0 to 10 V DC output signals at VFD1 & VFD2 terminals
where 10 V DC is maximum speed.
The Fan Control Module sends 0 to 120 V AC to control single phase fans when they are used. The FCM defaults to control
the Intake fan when both Intake and Exhaust applications are used. If the EBC30 draft reading is out of acceptable range
(64 % deviation) for 15 seconds, the control will go into Alarm status and open all of the AUX RELAY contacts that shut
down the appliances. When draft is met again, it will function as stated above. The control will also go into alarm immedi-
ately when the Ashcroft XTP detects an internal failure.
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EBC30 3002180 100315
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