Operating remote devices
EST2 System Operations Manual 3.13
SHO-4
The SHO-4 module provides 4 three-position rotary switches and
12 LEDs for remote switching and annunciator applications.
Two yellow LEDs and one green LED are positioned next to
each switch. The yellow LEDs operate independent of the
switches, which the system program controls. The green LED
illuminates when the switch is in the center position. Typical
applications include Hand-Off-Automatic (HOA) control and the
override of automatic systems.
The SHO-4 switches activate control fans, dampers, etc. The
center switch position is the automatic operational position. The
switch, in the center position, lights the green LED to show that
the HVAC system is using its normal control cycle.
In a typical program, the upper switch position forces the device
to turn on through a control module or zone. The lower switch
position forces the device to turn off again. Status zones
connected to vane or limit switches, contractor status switches,
etc. activate the upper and lower LEDs to indicate a device's
status.
STDOP018.CDR
LED/switch group
Slip-in label protector
Figure 3-9: SHO-4 Remote annunciator lamp and switch module
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