Specification

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8. IMPORTANT! Set the Upstream/Downstream switch shown in Figure 10 so that it matches
the FILTERSCAN WiFi Air Filter Monitor’s position with respect to the air filter (that is, OFF
for upstream mounting or ON for downstream or differential mounting). Please see the
APPENDIX for 'Various HVAC Configurations for Monitor Installation' configurations.
Figure 10: Inside of the FS-245-C FILTERSCAN WiFi monitor
Applying Power – Model FS-245-C (15-24V AC/DC)
SAFETY This model product should only be installed by a licensed electrician.
1. This model is powered from the HVAC system’s auxiliary 15 to 24 VAC/DC power supply and should
be installed by a qualified electrician. A typical installation will have that power run through an
installer-provided conduit to the FILTERSCAN WiFi Air Filter Monitor.
2. Locate the six terminals on the left-hand bottom corner of the printed circuit board illustrated in
Figure10. Connect 15 to 24V AC or DC to the 1
st
and 3
rd
leftmost terminals as shown. The 2
nd
leftmost
terminal is for earth ground connection, if available. DO NOT CONNECT IF THE HVAC SYSTEM’S
AUX POWER HAS ANY LEG CONNECTED TO EARTH GROUND!
3. The three terminals on the rightmost terminals are for connecting the optional dry contact relay output.
Reference Figure 21 in the APPENDIX.
4. When power is applied, the beeper will sound momentarily and the STATUS LED will come on green
momentarily, then turn on and remain red for approximately one minute. This indicates that the unit
15 to
24V AC
Do not connect
Color 1
Color 2
AC/DC
AC/DC