60
RT-SVX072A-EN
• not pass between buildings.
Variable Air Volume System
Controls
Discharge Temperature Control
Changeover Contacts
These contacts are connected to the customer
connection 1KF11 when daytime heating on Discharge
Temperature Control units with internal or external
hydronic heat is required. Daytime (occupied) heating
switches the system to a Zone Temperature Control
type mode of operation. Refer to the unit wiring
diagram for the field connection terminals in the unit
control panel. The switch must be rated at 12 ma @ 24
VDC minimum.
Remote Zone Sensor (BAYSENS073*)
This electronic analog sensor features remote zone
sensing and timed override with override cancellation.
It is used as the source for zone temperature control.
Refer to for the Temperature vs. Resistance coefficient.
Remote Zone Sensor (BAYSENS074*)
This electronic analog sensor features single setpoint
capability and timed override with override
cancellation. It is used with a Trane Integrated
Comfort™ system. Refer to for the Temperature vs.
Resistance coefficient.
Equipment Stop
A field-supplied single pole single throw switch can be
used to shut down the unit operation. This switch is a
binary input wired to the customer connection, wired
to 1XD24 (see unit diagrams). Ensure the appropriate
jumper wire at 1XD24 is removed when this switch is
installed. When opened, the unit shuts down
immediately and can be canceled by closing the switch.
The switch must be rated for 12 ma @ 24 VDC
minimum.
Ventilation Override Mode (VOM)
Contacts
Ventilation Override Modes (VOM) give the building
controller the ability to override normal unit operation
and provide special ventilation operation. VOM is
initiated only at the provided five binary inputs (Mode
A, Mode B, Mode C, Mode D, Mode E). When any of the
normally open contacts are closed, VOM initiates
specified functions such as space pressurization, relief,
purge, purge with supply air pressure control, and unit
off when any one of the corresponding binary inputs
are activated. The compressors and condenser fans,
and all other components not directly controlled via
VOM events, are disabled during the ventilation
operation. If more than one ventilation sequence is
activated, Mode A has highest priority, Mode E has
lowest.
This function gives the customer the ability to override
normal unit operation via a supervisory controller.
Typically, these requests originate from a fire control
panel. Flexibility is provided by allowing the customer
to re-define each of the five responses at the front
panel, along with allowing each individual response to
be ‘Locked’ to insure expected operation is not
changed. See Programming Guide for more
information.
This feature is optional. When configured VOM has
priority over Emergency Override, System Mode Off,
and normal unit operation. The following overrides will
prevent or terminate VOM operation.
• Local Stop
• Equipment Stop
• Emergency Stop
• Manual Control
When any VOM Mode (A, B, C, D, E) input is activated
or closed, the VOM mode of operation will begin in less
than 10 seconds, and a VOM Relay binary output will
energize/close. Heating capacity, cooling capacity, and
Rapid Restart will be disabled/terminated.
Refer to Table 29, p. 61 summarizing the unit operation
in response to VOM binary inputs Modes. VOM inputs
are fully configurable; therefore, Table 29, p. 61
provides the factory default settings.
If one or more of the 5 VOM inputs are closed, the unit
will enter the VOM mode with the highest priority (A
highest, E lowest). Should the unit be in an active VOM
mode and a VOM input of higher priority is closed, the
unit will immediately transition to the higher priority
mode. Should the unit be in an active VOM mode and a
VOM input of lower priority is closed, the unit will not
change to this lower priority mode until the current
(higher priority) VOM mode binary input is opened.
When all VOM inputs are open, within 15 seconds,
VOM terminates. All unit components will be reset OFF
or CLOSED, and after Unit Power Up Delay is honored,
the unit will start normal operation.
These functions are controlled by binary inputs wired
to the VOM. They can be initiated by a toggle switch, or
a time clock. The switch must be rated for 12 ma @ 24
VDC minimum.
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