RT-SVX063G-EN
71
for 40 continuous seconds, the supply fan will indicate a
No-Flow condition.
Operation during Manual Override and
VOM (Emergency Override) Modes
Manual Override, VOM, and Emergency Override modes
will operate as defined except for the following
modifications:
1. If the fan is ON it will run at line frequency.
2. The VAV Box Relay will follow the defined operation
specified in each VOM Mode Front Panel setting.
3. External fan control in bypass mode is supported. An
external Supply Fan Speed Setpoint value = 0% will
turn the fan Off, and any value > 0 will turn the fan On.
The Supply Fan Speed Status always reports 100%
speed during active supply fan bypass operation.
Minimum Ventilation Control
Symbio 800 provides outdoor air minimum ventilation
control via options described below. Traq
TM
outdoor air
flow control is the highest priority when installed and
enabled. If Traq becomes disabled or inactive, Outdoor Air
Flow Compensation will calculate a damper minimum
position setpoint (this option should be disabled on
constant volume units). If Outdoor Air Flow Compensation
is disabled, Outdoor Air Minimum Position Setpoint will
calculate damper minimum position setpoint.
Outdoor Air Flow Control (Traq)
The outdoor air damper is modulated to provide outdoor air
flow (cfm) required by Outdoor Air Minimum Flow Setpoint.
The outdoor air damper will modulate closed and open to
maintain the required outdoor air minimum flow rate. See
for additional information and settings.
The provided air flow measurement capabilities include
periodic, automatic calibration; however, air flow gain and
offset settings are provided for field adjustment.
Outdoor Air Flow Compensation
The outdoor air damper minimum position is modulated to
provide outdoor air based on a variable supply fan speed.
When supply fan increases speed the outdoor air damper
minimum position is reduced, to prevent over ventilation.
When supply fan decreases speed the outdoor air damper
minimum position is increased to maintain design outdoor
air flow requirements. There are three user editable
settings to linearize damper position with the fan curve.
See
for additional information.
Outdoor Air Minimum Position Control
This function provides a fixed damper position for minimum
outdoor airflow requirements. The damper is controlled to a
position determined by Economizer Minimum Position
Setpoint Active. This feature is available on all unit types
with an outdoor air damper, but commonly used on
constant volume units.
Demand Control Ventilation (DCV)
Demand control ventilation reduces energy consumption
by reducing the outdoor air damper below minimum
ventilation based on space CO
2
. Decreasing CO
2
levels
will decrease damper position to DCV minimum damper
position setpoint. Increasing CO
2
level will increase
damper position to design minimum setpoint. DCV requires
a valid space CO
2
value.
Demand control ventilation setpoints used in all methods.
•
Space CO
2
high limit
•
Space CO
2
low limit
DCV when enabled with outdoor airflow control (Traq),
DCV resets the outdoor air minimum flow setpoint based
on space CO
2
. DCV enabled with Outdoor Air Flow
Compensation, DCV resets the outdoor air damper
minimum position based space CO
2
and supply fan speed.
DCV enabled with Outdoor Air Minimum Position Control
resets the outdoor air damper minimum position based on
space CO
2
.
Table below summarizes the settings used for each
Minimum Damper Position Control and Demand Control
Ventilation.
Содержание IntelliPak with Symbio 800
Страница 16: ...16 RT SVX063G EN Figure 1 20 to 30 ton front view inches 40 28 90 63 27 31 FRONT VIEW 20 30T Dimensional Data ...
Страница 18: ...18 RT SVX063G EN Figure 3 40 to 55 ton front view inches 27 31 40 28 90 63 FRONT VIEW 40 55T Dimensional Data ...
Страница 64: ...64 RT SVX063G EN Figure 37 Dry bulb changeover map Startup the Unit ...
Страница 137: ...RT SVX063G EN 137 Notes ...
Страница 138: ...138 RT SVX063G EN Notes ...
Страница 139: ...RT SVX063G EN 139 Notes ...
