Electro Industries EM-MC00 Series Installation & Operating Manual page 13

High Voltage Vent Hood Lighting
Note: For multi-speed vent hood installations, consideration must be made with vent
hoods that include higher wattage lighting. It is possible that the low speed trigger point
of the fan is equal to or lower than the current draw of the integrated lighting in the vent
hood itself. In this case, the CT must be installed at the motor in the vent hood minus the
lighting.
WARNING
DO NOT RETURN SOURCE POWER TO UNIT UNTIL CT SECONDARY IS TERMINATED AT
CONTROL BOARD. OPERATING THE VENT HOOD WITHOUT THE CT TERMINATED CAN
CAUSE DAMAGE TO THE CT AND A VERY HIGH SHOCK HAZARD.
Current Transformer Triggering – In order for the CT to properly
communicate external exhaust source blower motor on/off activity, it may
be necessary to provide one or more "wraps" of the power wire through the
CT.
These steps apply to all three CT paired inputs (HI, MED and LO):
1. From the external exhaust source blower motor nameplate or with actual clamp-on
current meter, note and record the external exhaust source blower motor current.
2. Depending upon the motor current, select the correct number of CT turns (see below
chart).
3. Temporarily disconnect power wire selected to feed through the CT. Depending upon the
needed turns through the CT above, either extend this wire or simply put the wire through
the CT hole as needed.
07/29/2019
Motor Current
Less than 1A
2A to 3A
4A to 6A
Greater than 6A
CT Loops or Turns
6 Wraps
3 Wraps
1 Wrap
0 Wraps
11 EI915