JOHNSON CONTROLS
11
FORM ET130.13-NOM3 (708)
Manual Fan CFM Adjustment
1. Verify that the jumper on ETPWM board is in the
“MAN” position (shipped from factory in Manual
mode)
2. Connect voltmeter to wire loop VDC (+) and wire
loop COM (-).
3. Determine the DC voltage for required airfl ow from
the Fan Calibration Curve supplied on the side of
the equipment. Use the bottom (5 to 10 volts DC)
scale on the chart. An example Fan Calibration
curve is shown in Table 3; however, the curve on
the side of the equipment should be used in deter-
mining the voltage.
4. Using a 1/8” fl at bladed screwdriver, adjust the
manual speed potentiometer, labeled SPD, to
obtain the required voltage. Clockwise increases
airfl ow, counterclockwise decreases airfl ow.
5. Do not set the voltage lower than 5.1 VDC or
higher than 9.9 VDC or motor may experience
starting problems.
6. Do not set the balance voltage outside limits of the
voltage/CFM curve or erratic motor operation and
eventual failure may result.
Remote Fan CFM Adjustment
1. Relocate the jumper on ETPWM board to the REM
position.
2. Determine the DC voltage for required airfl ow from
the Fan Calibration Curve supplied on the side of
the equipment. Use the top (2 to 10 Analog Input
Volts DC) scale on the chart. An example Fan
Calibration curve is shown in Table 3; however,
the curve on the side of the equipment should be
used in determining the voltage.
3. Remotely adjust the external voltage source to the
desired volts DC for required airfl ow.
4. Do not operate motor at control voltage lower than
2.1 VDC or higher than 9.9 VDC or motor may
experience starting problems.
5. Do not operate motor at control voltage outside
limits of the voltage/CFM curve or erratic motor
operation, and eventual failure may result.
Status LED
When the motor is running, the LED alternates between
CFM and RPM indications. In the RPM mode, LED
turns on for a period of approximately 220 microseconds
at a rate of 36 pulses per revolution. This mode lasts
for ten seconds. Due to the rapid rate, LED will appear
to be dimly lit, not fl ashing. As RPM is increased,
brightness will increase. In the CFM mode, the LED
will fl ash slowly, and at maximum brightness, once for
every 100 CFM. Accuracy is +/- one fl ash. LED will
then return to RPM mode, and cycle will repeat.
MAINTENANCE
Factory Provided Damper Actuator
Equipment may be supplied with a fi eld
or factory mounted damper actuator.
If actuator is factory provided, see
ACT24 Actuator IOM available at
www.enviro-tec.com. See Table 1 for
maximum wire lengths for control
voltage.
Damper Shaft
There is an indicator on the end of the damper shaft that
can be used to determine the position on the damper
blade. If the indicator is horizontal, the damper is
completely open.
Motor/Blower
Fan powered terminal unit motors are equipped with
permanently lubricated bearings and require little or
no maintenance. The frequency of required cleaning
is dependent on the operating hours of the system,
fi lter maintenance and effi ciency as well as dirt load.
Periodically inspect the motor and blower-housing wheel
for accumulation of dust and clean as necessary.
TABLE 1 - MAXIMUM WIRE LENGTHS
WIRE SIZE MAX FEET
16 GA 1225 FT
18 GA 725 FT
20 GA 400 FT
22 GA 200FT
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