RT-SVX073A-EN
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Table 34. Outdoor air damper minimum ventilation control methods (continued)
Traq Outdoor Air Flow
Compensation
Demand Control
Ventilation
Description Outdoor Air Damper
Controlling Setpoints
Disabled Enabled/Active Disabled Outdoor Air Damper
Minimum Position is reset
based on supply fan speed.
Setpoint:
Economizer Minimum
Position Setpoint Active
Settings:
Design Min OA Damper Pos
Setpoint Max Fan
Design Min OA Damper Pos
Setpoint Mid Fan
Design Min OA Damper Pos
Setpoint Min Fan
Disabled Enabled/Active Enabled/Active Outdoor Air Damper
Minimum Position is reset
based on supply fan speed
and space CO2.
Setpoint:
Economizer Minimum
Position Setpoint Active
Settings:
Design Min OA Damper Pos
Setpoint Max Fan
Design Min OA Damper Pos
Setpoint Mid Fan
Design Min OA Damper Pos
Setpoint Min Fan
DCV Min Outdoor Air Dampr
Pos at Max Fan
DCV Min Outdoor Air Dampr
Pos at Min Fan
Disabled Disabled Enabled/Active Outdoor Air Damper
Minimum Position is reset
based on space CO
2
.
Setpoint:
Economizer Minimum
Position Setpoint Active
Settings:
Design Min OA Damper
Position
DCV Min Outdoor Air
Damper Pos Setpoint
Disabled Disabled Disabled Outdoor air damper position
is controlled by cooling
Setpoint:
Economizer Minimum
Position Setpoint Active
During normal occupied periods of heating and cooling
modes of operation, the outdoor air damper maintains
ventilation requirements via the minimum position control
methods. However, the following modes of operation will
override the damper minimum position setpoint to 0%.
• Morning Warm Up
• Pre cool
• Night Purge
• Unoccupied Heat
• Unoccupied Cool
• Off
Relief Fan and Space Static Pressure
Control
The primary role of relief fan is to relieve air from the
building to control space static pressure. This is common
when the unit is economizing and bringing in large
quantities of outside air.
Space Static Pressure Control with
Statitrac™
Statitrac™ is an option. Space static pressure control
operation will become active when the supply fan is On and
proven, the outdoor air damper position is greater than the
relief enable position setpoint and a valid space static
pressure value is greater than the active space static
pressure setpoint plus half the deadband.
When the activation conditions have been met, the unit will
start the relief fan and control relief damper and fan speed
to maintain the space static pressure setpoint. Once the
relief fan operation is proven, the fan will modulate to track
the relief damper position.
Space pressure control operation terminates when the
relief damper is closed and the space static pressure is
below setpoint minus half the deadband, or space static
pressure is within deadband for 30 minutes.
Unit Startup
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