Variable Air Volume System Controls; Constant Volume Or Variable Air Volume System Controls - Trane INTELLIPAK RT-SVX10C-EN Installation And Operating Manual

Remote Minimum Position Potentiometer (5U70)
(BAYSTAT023A)
The remote minimum position potentiometer is used on
units with an economizer. It allows the operator to remotely
set the economizer's minimum position (which controls the
amount of outside air entering the unit). Use the installation
instructions that shipped with the potentiometer to install it,
and the appropriate illustrations in Figure 3-16 or
3-17 to connect it to the unit.
External Auto/Stop Switch (5S67)
A field supplied single pole single throw switch (5S67) may
be used to shut down the unit operation. This switch is a bi-
nary input wired to the RTM. When opened, the unit shuts
down immediately and can be cancelled by closing the
switch. Refer to the appropriate illustrations in
Figure 3-16 or 3-17 for the proper connection terminals in
the unit control panel. The switch must be rated for 12 ma
@ 24 VDC minimum.
VOM Contacts (5K90, 5K91, 5K92, 5K93, 5K94)
If the unit is equipped with a Ventilation Override Module
(VOM), (i.e. unit model number digit 21+ is a "N"), a num-
ber of special functions can be specified by the building
owner or contractor. These functions can include, but are
not limited to; (1) Unit Off, (2) Pressurization, (3) Exhaust,
(4) Purge, and (5) Purge with Duct Pressure Control. They
are controlled by binary inputs wired to the VOM. These
functions can be initiated by; a toggle switch, a time clock,
or an ICS TM output. The switch must be rated for 12 ma @
24 VDC minimum. The following preset sequences can be
modified by the customer;
1. VOM Mode "A" Priority 1 - Unit Off:
-Supply fan - OFF
-Inlet vanes/VFD - 0% (if equipped)
-Exhaust fan - OFF, Exhaust dampers Closed
-O/A dampers - Closed
-Heat - All stages OFF, Modulating Heat output
at 0 vdc
-Occupied/Unoccupied output - De-energized
(Occupied)
-VO Relay - Energized
-Pre-heater State - Off (if equipped)
2. VOM Mode "B" Priority 2 - Pressurize:
-Supply fan - ON
-Inlet Vanes/VFD - 100% (if equipped)
-Exhaust fan - OFF, Exhaust dampers - Closed
-O/A dampers - Open
-Heat - All stages OFF, Modulating Heat output
at 0 vdc
-Occupied/Unoccupied output - Energized
(Unoccupied)
-VO Relay - Energized
-Pre-heater State - Off (if equipped)
3. VOM Mode "C" Priority 3 - Exhaust:
-Supply fan - OFF
-Inlet Vanes/VFD - 0% (if equipped)
-Exhaust fan - ON, Exhaust dampers - Open
-O/A dampers - Closed
-Heat - All stages OFF, Modulating Heat output
at 0 vdc
-Occupied/Unoccupied output - De-energized
(Occupied)
-VO Relay - Energized
-Pre-heater State - Off (if equipped)
Installation (Continued)
4. VOM Mode "D" Priority 4 - Purge:
-Supply fan - ON
-Inlet Vanes/VFD - 100% (if equipped)
-Exhaust fan - ON, Exhaust dampers - Open
-O/A dampers - Open
-Heat - All stages OFF, Modulating Heat output
at 0 vdc
-Occupied/Unoccupied output - Energized
(Unoccupied)
-VO Relay - Energized
-Pre-heater State - Off (if equipped)
5. VOM Mode "E" Priority 5 - Purge with duct pressure
control:
-Supply fan - ON
-Inlet Vanes/VFD - (if equipped) Controlled by
S/A Pressure Control with supply air pressure high
limit disabled.
-Exhaust fan - ON, Exhaust dampers - Open
-O/A dampers - Open
-Heat - All stages OFF, Modulating Heat output
at 0 vdc
-Occupied/Unoccupied output - Energized
(Unoccupied)
-VO Relay - Energized
-Pre-heater State - Off (if equipped)
"OFF" - will appear in the Ventilation Override screen after
all VOM binary inputs have been reset (opened).
Due to codes in some areas, the definitions for some or all
of the VOM modes may have to be locked into the program
by the user. Once the definitions are locked, the Ventilation
Override Module must be replaced in order to reprogram
that sequence.
Refer to Figure 3-16 & 3-17 for the proper connection termi-
nals in the unit control panel for each of the VOM initiating
device's and the appropriate Programming, Troubleshooting
Guide (PTG Latest Edition) for programming instructions.
Emergency Override Definitions (with LCI-I module
installed)
When an LCI-I module is installed, the user can initiate one
of five (5) Emergency Override sqeuences that have the fol-
lowing predefined unit operation:
PRESSURIZE
Supply Fan - On
Inlet Vanes - Open (if equipped)
Exhaust Fan - Off (if equipped)
Exhaust Dampers - Closed (if equipped)
OA Dampers - Open
Heat - All heat stages Off (staged gas and elec.), Hydronic
heat & Mod Gas Heat output at 0%.
Occupied/Unoccupied output - Energized
VO Relay - Energized (with VOM module installed)
OA Preheater State - Off (with VCM module installed)
DEPRESSURIZE
Supply Fan - Off
Inlet Vanes - Closed (if equipped)
Exhaust Fan - On (if equipped)
Exhaust Dampers -Open (if equipped)
OA Dampers - Closed
Heat - All heat stages Off (staged gas and elec.), Hydronic
heat & Mod Gas Heat output at 0%.
Occupied/Unoccupied output - De-energized
VO Relay - Energized (with VOM module installed)
OA Preheater State - Off (with VCM module installed)
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