CBV-2U4-3T(-N) |
Control Sequence Overview
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Primary Air State: Hot
The hot primary air state is used when the Air Handler goes into a heating mode. The hot primary air state is
used to put the box into Morning Warmup Mode. In this mode the primary air damper opens in direct
proportion to the heating load percentage calculated by the
CBV-2U4-3T(-N)
controller.
The PrimaryAirState may be set by the GroupXOccupiedCode or by the on-board Supply Air temp to hot air.
When the primary air state is hot, the primary air volume control is approximated below:
•
Heat Flowrate Setpoint is
(A211).
•
Deadband Flowrate Setpoint is
(A210).
•
Cooling Flowrate Setpoint is also
(A210).
Primary Air Flow Reset CO
2
Local CO
2
Sensor
(A67) goes above the
(A255), the primary air flow setpoint will
modulate up to the
(A211), or maximum Flowrate setpoint. CO
2
demand calculation can be
determined from point
(A76). If the
CBV-2U4-3T(-N)
is in heat mode, the heat will
stage on accordingly. If heating demand is greater than 95%, however, the calculated
(A76) will be limited to 70%.
Remote
CO
2
Sensor
If the
CBV-2U4-3T(-N)
is a slave VAV box, and another controller is master and has a CO
2
sensor, users can
write the CO
2
(A75). When configured for remote CO
2
, this
will calculate the Flowrate setpoint in the same manner as if it had a local CO
2
sensor.
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800
900
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Primary Air Hot
CFM Stpt
Heat
Stpt
DB
Stpt
Cool
Stpt
Содержание CBV-2U4-3T
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