ABB CBV-2U4-3T User Manual page 51

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
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:
900
Heat
800
Stpt
700
600
500
400
300
200
100
0
68 69
• Heat Flowrate Setpoint is
• Deadband Flowrate Setpoint is
• Cooling Flowrate Setpoint is also
Primary Air Flow Reset CO
Local CO Sensor
2
If the local ZoneCO2ValueCV
modulate up to the
determined from point
stage on accordingly.
LocalRemoteSlaveC02Calc
Remote CO
Sensor
2
If the CBV-2U4-3T(-N)
write the CO calculated demand to the
2
will calculate the Flowrate setpoint in the same manner as if it had a local CO
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CBV-2U4-3T(-N) |
Primary Air Hot
DB
Stpt
70 71 72 73 74
TABPriAirMaxStpt
TABPriAirDbandStpt
TABPriAirDbandStpt
2
(A67) goes above the
TABPriAirMaxStpt (A211), or maximum Flowrate setpoint. CO
LocalRemoteSlaveC02Calc
If heating demand is
(A76) will be limited to 70%.
is a slave VAV box, and another controller is master and has a CO
RemoteSlaveCO2Cmd
Control Sequence Overview
CBV-2U4-3T(-N)
Cool
Stpt
75 76 77
(A211).
(A210).
(A210).
LocalCO2Stpt (A255), the primary air flow setpoint will
(A76). If the CBV-2U4-3T(-N)
greater than 95%,
(A75). When configured for remote CO
controller.
CFM Stpt
demand calculation can be
2
is in heat mode, the heat will
however, the calculated
sensor, users can
2
2
sensor.
2
, this
51