Trane IntelliPak 2 - Page 89

RT-SVX073A-EN
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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 user interface, 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 the table below summarizing the unit operation in
response to VOM binary inputs Modes. VOM inputs are
fully configurable; therefore, 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.
Table 43. Ventilation override mode
VOM Input OUTPUT OPERATION Heat Cool Mode Status
Mode A
(Unit Off)
Supply fan Off/0% Off
Outdoor air damper Closed
Relief fan / Relief damper Off/Closed
Return Fan/Relief Damper Off/Closed
VAV Box Relay Energized
Mode B
(Pressurize)
Supply fan On/100%
(a)
Fan Only
Outdoor air damper 100%
Relief fan / Relief damper Off/Closed
Return Fan/Relief Damper Off/Closed
VAV Box Relay Energized
Mode C
(Depressurize)
Supply fan Off/0% Fan Only
Outdoor air damper 0%
Relief fan / Relief damper On/Open
Return Fan/Relief Damper On/Open
VAV Box Relay De-engerized
Mode D
(Purge)
Supply fan On/100% Fan Only
Outdoor air damper Open
Relief fan / Relief damper On/Open
Return Fan/Relief Damper On/Open
VAV Box Relay Energized
Unit Startup