32
ACC-APG002A-EN
Table 7. 0 to 100% economizer – multi-speed supply fan (2–speed) (continued)
Supply Fan
Compensa-
tion
Demand
Controlled
Ventilation
Remote
Minimum
Position
Occupancy
Status
Outdoor Air Damper Controlling Setpoints
Enabled
Not Installed
or Disabled
Not Installed
Occupied,
Occupied
Bypass
Supply Fan at 100%:
Design Minimum OA Damper Position at Full Fan Capacity
Supply Fan at minimum speed:
Design Minimum OA Damper Position at Min Fan Capacity
Enabled Installed
Installed or
Not Installed
Occupied
Standby
Supply Fan at 100%:
Standby Minimum OA Damper Position at Full Fan Capacity
DCV Minimum OA Damper Position at Full Fan Capacity
Supply Fan at minimum speed:
Standby Minimum OA Damper Position at Min Fan Capacity
DCV Minimum OA Damper Position at Min Fan Capacity
Enabled
Not Installed
or Disabled
Installed or
Not Installed
Occupied
Standby
Supply Fan at 100%:
Standby Minimum OA Damper Position at Full Fan Capacity
Supply Fan at minimum speed:
Standby Minimum OA Damper Position at Min Fan Capacity
Disabled
Installed or
Not Installed
Installed or
Not Installed
Occupied
Standby
Economizer Minimum Position Setpoint BAS
0 to 50% Motorized Damper
When a 0 to 50% motorized damper is installed, with any supply fan type, the outdoor air damper is
controlled to a setpoint from a Remote Minimum Position (wired input), Motorized Damper Position
Setpoint, or Economizer Minimum Position Setpoint BAS. The following table summarizes which
setpoint is in control of the damper position based on options installed and enabled.
Table 8. 0 to 100% economizer – 0 to 50% motorized damper
Supply Fan
Compensation
Remote Minimum
Position
Occupancy Status
Outdoor Air Damper
Controlling Setpoints
Enabled Installed
Any
Remote Minimum Position
Enabled Not Installed
Any
Motorized Damper Position
Setpoint
Disabled Installed or Not Installed
Any
Economizer Minimum
Position Setpoint BAS
Demand Controlled Ventilation (DCV) — Thermostat Control
When the Symbio™ 700 is configure for Conventional Thermostat Control, 0 to 100% Economizer
Damper and Demand Controlled Ventilation (Installed), the controller provides an Occupancy binary
input that can be used to control Occupied and Unoccupied modes of operation. In Unoccupied mode,
DCV is disabled, and the outdoor air damper minimum position is effective 0%. In Occupied mode, DCV
will control the outdoor air damper based on Space CO2 while the supply fan is On, as described in the
previous sections.
In Occupied mode, if the supply fan cycles Off, the controller will continue to monitor Space CO2. If
Space CO2 exceeds the Space CO2 High Limit setpoint for 15 minutes, the supply fan will turn On and
operate at minimum speed and outdoor air damper at the Design Minimum OA Damper Position. If
Space CO2 falls below the Space CO2 High Limit – 200 ppm, the supply fan will cycle Off. The supply
fan will also cycle off if occupancy changes to Unoccupied.
Outdoor Air Damper Control
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