Distech Controls SC-EP Series User manual
Installation Guide
Product Description
The electronic to pneumatic transducer converts an electical input signal to a pneumatic output signal to position pneumat-
ic damper and valve actuators in HVAC systems. The transducer provides a linear 3-15 PSI output in response to a 4-20
mA, 0-10 Vdc or PWM input.
General Installation Recommendations
Disconnect the power supply before installation and do not exceed device ratings.
Make all connections in accordance with the wiring diagram and electrical codes.
Particles in the air supply larger than 0.03 microns may adversely aect the reliability and life of the transducer.
A SC-EPAF in line air lter is recommended for installation between the main air supply and the main air port of the de-
vice.
A refrigerated air dryer, particulate lter and coalescing lter should provide a quality air supply.
Compressor oil must be non-paran mineral base of naphtha base. Synthetic base oils will destroy pneumatic controls
and void the warranty.
Do not locate the unit in areas subject to incidental contact, vibration, severe mechanical shock, excessive moisture,
or corrosive fumes.
The transducers must be mounted within 5° of the upright position. See the “UP” arrow on the PCB or label.
SC-EP Series
SC-EP Series
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Mounting Instructions
Select the mounting location and mount the device with the “UP” arrow pointing upwards using the two screws through
the base of the snap track. The PCB may be removed from the snap track for easier installation. See Figure 1. Ensure
that the screw heads do not contact the PCB.
If the enclosure is present, use a Phillips screw driver to remove the (2) screws, as shown in Figure 3. Mount the en-
closure to a vertical surface within 5° of perfectly vertical ensuring the device is upright, using the “UP” arrow on the
PCB as a guide. The enclosure is to be secured using the two integrated screw tabs using #10 self tapping screws (not
supplied). See Figure 4.
Make all necessary electrical connections as per the wiring instructions.
Connect the pneumatic lines to the unit, ensuring that the main air supply is connected to the black tube and the branch
line is connected to the clear tube. The main and branch lines are also labeled on the end of the valve with a “M” and
a “B”. See Figure 2.
The device may be tested by applying the input ZERO signal (either 4 mA, 2 Vdc, or 0 Vdc as applicable) and checking
the output for a pressure of 3 PSIG (21 kPa). Then adjust the input for the SPAN signal (either 20 mA or 10 Vdc) and re-
check the output for a pressure of 15 PSIG (103 kPa). The device is factory calibrated for these ranges and should not
be readjusted in the eld. If the unit does not perform as indicated, then verify all applicable electrical signals (4 mA, 20
mA, 0 Vdc, 10 Vdc, and the power supply) using a multimeter. Also verify that the input air supply is 20-30 PSIG (138-
207 kPa) and that the unit is properly mounted and that all wiring is per the wiring illustrations.
Device Information
SC-EP Series_IG_10_EN
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Specications subject to change without notice.
©, Distech Controls Inc., 2019. All rights reserved.
Global Head Oce - 4205 place de Java, Brossard, QC, Canada, J4Y 0C4 - EU Head Oce - ZAC de Sacuny, 558 avenue Marcel Mérieux, 69530 Brignais, France
Wiring Instructions
The SC-EP04XX is a loop powered 4-20 mA device and requires a 4-20 mA signal to be connected to the INPUT ter-
minal and the system common connected to the COM terminal.
The SC-EPFSXX requires a jumper selection for the input signal type, either 4-20 mA or 0-10 Vdc. If 4-20 mA is selected
then the wiring is the same as for the SC-EP04XX however if a 0-10 Vdc signal type is selected then a power supply
signal must also be provided on the PWR terminal. Make sure that the shorting bars on the jumper run the same direc-
tion as the indicating lines beside the jumper.
The SC-EP10XX is a loop powered 2-10 volt device and requires a 2-10 Vdc signal to be connected to the INPUT termi-
nal and the system common connected to the COM terminal.
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