ENMET ISA-M - Manual (Page 6)

ENMET Corporation ISA – M
4
4.0 Installation 4.0 Installation
The ISA – M is completely oiltight. Use the correct oiltight fitting for the cord or conduit when supplying power to
the unit.
N OTE : This instrument is N OT rated for hazardous locations. The instrument must be located in a NON-Hazardous area.
4.1 Mounting and Power Hook-up
Figure 3: Mounting Dimensions of the ISA – M
1. A 110 V AC line cord is supplied, plug this into an appropriate outlet.
2. If conduit is preferred, remove the terminal strip cover from TB4 inside the control unit (simply pull the cover off
of its holding prongs). Apply 110 V AC power to the appropriate terminals. (Refer to Figure 2).
C AUTION : Utilizing 220 V AC power requires a change in the transformer hook-up by a competent electrician or
electronics technician; but this change is best done at ENMET.
12 V DC may be used as a primary source (refer to Figure 2) or as an emergency back-up source, both ac and dc
power can be applied at the same time. Current flows from the ac source; dc current will flow only when the ac
power is interrupted.
3. Run the relay contact leads through the same oiltight fitting as the power supply leads or out through a second
fitting.
N OTE : When the power supply is interrupted, the relays switch to the same position as for a true gas alarm condition,
and the power light goes off. Do not connect the unit to other voltage supply lines.
4. Replace terminal strip cover on TB4 inside the control unit.
5. Proceed to Section 5.0 for initial warm-up and operating procedures.