Overheat / Fire Protection Panel
Overheat Detector (OVHT DET) Switch

Selects the active overheat / fire detection loop(s).

NORMAL (Center) – Detection loop A and loop B are active.

When A is selected – Detection loop A is the active loop.

When B is selected – Detection loop B is the active loop.
The FAULT light illuminates if a single loop is
inoperative for the selected switch position( A or B).
If both detection loops are inoperative, the FAULT light
will be illuminated in the NORMAL (center) position.