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5.1.5 Current Sensors
Current sensors are installed on high voltage supply wires to sense current going to a fan motor.
They are used to prove the ON/OFF state of fan motors.
FIGURE 5.1.5 CURRENT SWITCH
NOTE: Current sen-
sors are calibrated
for reduced fan
speed at time of
shipment from the factory.
Immediately after entering
new operating parameters
for the fans (done during
the start up process), cur-
rent sensors are to be
re-calibrated for minimum
current draw. The fan
should be running at its
minimum speed.
When the unit starts, this screen will show when the fans are enabled. There is a slight delay
of a few seconds, and then the second line, supply (or exhaust) fan on shows the status of the
current sensor.
The current sensors are factory adjusted and may need to be field-adjusted for the application.
This will be evidenced by getting a supply fan alarm (AL10) or exhaust fan alarm (AL11). The
instructions are in the Alarms and Troubleshooting section of this manual.
5.1.6 Filter Monitoring
There is a pressure transducer across the filters on the outdoor air and RA streams to monitor
the filter status. The scaling is factory set in this screen.
The alarm level can be set pressure can be set such that if the pressure reaches the alarm
level, the unit will alarm but keep running.
UNIT OPERATION