RT-SVX072A-EN
61
Table 29. VOM
VOM Input Output
Operation Heat Cool
Mode
Status
Mode A Supply fan Off/0% Off
(Unit Off) Outdoor air
damper
Closed
Relief fan /
Relief damper
Off/Closed
Return Fan /
Relief
Damper
Off/Closed
VAV Box
Relay
Energized
Mode B Supply fan On/100%
(1)
Fan Only
(Pressurize) Outdoor air
damper
100%
Relief fan /
Relief damper
Off/Closed
Return fan /
Relief damper
Off/Closed
VAV Box
Relay
Energized
Mode C Supply fan Off/0% Fan Only
(Depressu-
rize)
Outdoor air
damper
0%
Relief fan /
Relief damper
On/Open
Return fan /
Relief damper
On/Open
VAV Box
Relay
De-engerized
Mode D Supply fan On/100%
(1)
Fan Only
(Purge) Outdoor air
damper
Open
Relief fan /
Relief damper
On/Open
Return fan /
Relief damper
On/Open
VAV Box
Relay
Energized
Table 29. VOM (continued)
VOM Input Output Operation Heat Cool
Mode
Status
Mode E Supply fan On/Duct
Static
Pressure
Control
Fan Only
(Purge with
Duct Static
Pressure
Control)
Outdoor air
damper
Open
Relief fan /
Relief damper
On/Open
Relief fan /
Relief damper
On/Open
VAV Box
Relay
Energized
Refer to the appropriate Programming,
Troubleshooting Guide (PTG latest edition) for
programming instructions.
Emergency Stop Switch
A normally closed (N.C.) switch wired to the customer
connection (1KF11) and 1XD24 may be used during
emergency situations to shut down all unit operations.
When opened, an immediate shutdown occurs. An
emergency stop diagnostic is entered into the user
interface. The switch must be rated for 12 ma @ 24
VDC minimum.
Occupied/Unoccupied Contacts
This binary input provides the Occupied/Unoccupied
status information of the building to the Symbio 800. It
can be initiated by a time clock, or a Building
Automation System control output. The relay’s
contacts must be rated for 12 ma @ 24 VDC minimum.
Wall or Duct Mount Humidity Sensor
(BAYSENS036* or BAYSENS037*)
This field-installed humidity sensor is mounted in the
space or in the return air duct, sending an analog input
to the customer connection (1KF10) and 1XD26. It must
be ordered/installed with modulating hot gas reheat,
but can also be used for humidification applications.
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