RT-SVD03G-EN 111
Space Pressure Control with Statitrac (27.5-50 Tons)
Description of Function
With the RTRM v9.0 release, Voyager 3 units will have the option to utilize Space Pressure Control
with Statitrac for applications requiring tighter building pressure control. The Space Pressure
Control function turns the exhaust fan on and off and modulates the exhaust dampers independent
of the outside air dampers to maintain Space Pressure within the Space Pressure Deadband. The
Space Pressure Deadband is centered around the user selectable Space Pressure Setpoint. This
function is active whenever configured for Space Pressure Control with Statitrac and the Supply
Fan is energized.
Note: The unit must be equipped with an RTRM v9.0 or later, RTEM v1.0 or later, RTOM v3.0 or
later, and RTVM 3.0 or later to fully utilize Space Pressure Control with Statitrac.
Exhaust Fan Control
The Exhaust Fan(s) will be turned ON when the Space Pressure value rises above the deadband and
1. the Exhaust Enable Setpoint is set to 0% or
2. the Exhaust Enable Setpoint is greater than 0%, the OA Damper position is greater than the
Exhaust Enable Setpoint, and the integration of the control has determined that the exhaust
fans are needed
Once the Exhaust Fan(s) are energized, the Space Pressure control algorithm then provides control
of the exhaust damper which will open beyond its minimum position (3.5Vdc) up to 100% when
the pressure is above the Deadband and close toward min position when the pressure is below the
Deadband.
Note: The exhaust damper will be held at a control signal of 3.5Vdc any time the unit is powered
up, except during override conditions, to ensure that the exhaust fan does not run against
a closed damper.
The Exhaust Fan(s) will be turned OFF when either of the following conditions occur:
1. The exhaust damper is at minimum position for 30 continuous minutes.
2. Integration of space pressure error determines that the exhaust fan is not required.
Sensor and Setpoint Arbitration
Sensor and setpoint values may be provided from local sensor and setpoint inputs located on the
RTVM and RTOM and also from BAS/NETWORK provided data. If a valid value is provided from
BAS/NETWORK for the Space Pressure, Space Pressure Setpoint, or Exhaust Enable setpoint that
value will override the local setpoint and sensor inputs and will be used for control. If BAS/
NETWORK is not providing a valid value for any of these sensors or setpoints, the control will utilize
the local sensors and setpoints for space pressure control.
Space Pressure Zero Function
The Space Pressure Control function will provide a 23Vdc output signal from the RTVM
approximately every 60 seconds to energize solenoids for calibration purposes.
Exhaust Damper Output Control
The RTVM will provide a 2-10Vdc output signal range from 0-100% for Exhaust Damper control.
Note that any time the unit is powered up, the Exhaust Damper Output signal will be at 3.5Vdc
unless overridden completely closed. This is to ensure that the Exhaust Fan does not run against
fully closed dampers.
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