RT-SVX36G-EN
79
Installation
The DIP switches on the subbase are used to enable or disable applicable functions, i.e.; Morning
Warm-up, Economizer minimum CFM override during unoccupied status, Fahrenheit or
Centigrade, Supply air tempering, Remote zone temperature sensor, 12/24 hour time display,
Smart fan, and Computed recovery.
During an occupied period, an auxiliary relay rated for 1.25 amps @ 30 volts AC with one set of
single pole double throw contacts is activated. See
for the Temperature vs. Resistance
coefficient.
Remote Minimum Position Potentiometer (5U70) (BAYSTAT023*)
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
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 binary 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
or
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), a number 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/Return, (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 ICSTM output. The switch must be rated for 12 ma @ 24 VDC
minimum. The following preset sequences can be modified by the customer;
•
VOM Mode “A” Priority 1 - Unit Off:
–
Supply fan - OFF
–
Inlet vanes/VFD - 0% (if equipped)
–
Exhaust/Return fan - OFF, Exhaust/Return 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)
•
VOM Mode “B” Priority 2 - Pressurize:
–
Supply fan - ON
–
Inlet Vanes/VFD - 100% (if equipped)
–
Exhaust/Return fan - OFF, Exhaust/Return 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)
•
VOM Mode “C” Priority 3 - Exhaust/Return:
