To 50% Motorized Damper - Trane Symbio 700 Controller Application Manual

Outdoor Air Damper Control
Table 7. 0 to 100% economizer – multi-speed supply fan (2–speed) (continued)
Supply Fan
Compensa-

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
Enabled
Enabled
Disabled
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.
32
Demand
Controlled
tion Ventilation
Not Installed
Enabled Not Installed
or Disabled
Installed or
Enabled Installed
Not Installed
Not Installed Installed or
Enabled
or Disabled Not Installed
Installed or Installed or
Disabled
Not Installed Not Installed
Remote Minimum
Position
Installed
Not Installed
Installed or Not Installed
Remote
Occupancy
Minimum
Status
Position
Supply Fan at 100%:
Occupied, Design Minimum OA Damper Position at Full Fan Capacity
Occupied
Supply Fan at minimum speed:
Bypass
Design Minimum OA Damper Position at Min Fan Capacity
Supply Fan at 100%:
Standby Minimum OA Damper Position at Full Fan Capacity
DCV Minimum OA Damper Position at Full Fan Capacity
Occupied
Standby
Supply Fan at minimum speed:
Standby Minimum OA Damper Position at Min Fan Capacity
DCV Minimum OA Damper Position at Min Fan Capacity
Supply Fan at 100%:
Standby Minimum OA Damper Position at Full Fan Capacity
Occupied
Standby
Supply Fan at minimum speed:
Standby Minimum OA Damper Position at Min Fan Capacity
Occupied
Economizer Minimum Position Setpoint BAS
Standby
Occupancy Status
Any
Any
Any
Outdoor Air Damper Controlling Setpoints
Outdoor Air Damper
Controlling Setpoints
Remote Minimum Position
Motorized Damper Position
Setpoint
Economizer Minimum
Position Setpoint BAS
ACC-APG002A-EN