Control Wiring - Electro Industries EM-MC00 Series Installation & Operating Manual

There are two "tie-in" options available in connecting the Make-Up Air unit to a vent hood or other
venting equipment.
 Option 1 – Connect an isolated "dry" switch or relay contact to the R & W terminal block (TB1).
 Option 2 – Connect the supplied current transformer (CT) to terminal block (TB2)
o CT terminal block (TB2) allows for connections for up to three CT's, for use in
applications where multiple venting sources are utilized
Dry Type Switch Contact (Option 1)
This "on and off" control contact applied across R and W depends upon installation requirements and can
take on several possibilities:
– Pressure differential switch
– CT with integrated switch (not CT provided with unit)
– Relay across exhaust blower motor
– End switch associated with exhaust damper/motor
– Room thermostat
Note: A switch closure between R & W (TB1) results in high speed blower output only.
Connection Details
Connect one side of the field provided switch to the TB1
"R" and the other side of the switch to the TB1 "W".
NOTE: If using both Option 1 and Option 2, Option 1
(R&W) always has priority over Option 2 (CT). R&W
results in HI fan speed only.
Current Transformer (Option 2)
CT terminal block (TB2) – located on the left side of the
control module labeled "HI MED LO". This terminal block
allows connection of up to 3 CTs, based on quantity of
exhaust sources. Please refer to the Advanced Installation
section in this manual for applications involving more than
one venting source. Connect supplied CT as shown below.
If the installation includes a multi or variable speed fan, see
the Basic Setup & Configuration section for further
details.
Standard installation:
*Switch closure across CT HI-MED-LO will not activate make-up air. Contact factory for special
wiring application.
07/29/2019

Control Wiring

10 EI915