Honeywell CVL4022ASVAV1 Engineering Manual page 3

APPLICATION
VAV systems in commercial buildings typically incorporate a
central air handler that delivers a modulated volume of air at a
preconditioned temperature to multiple zones. Each zone is
serviced by a VAV terminal box unit. Each box incorporates an
air flow pickup assembly and motorized damper with optional
fan and/or reheat coil. The controller determines and
regulates the air flow of conditioned air to the space. The zone
PRIMARY
AIR TERMINAL UNIT
AIR
DP
PICKUP
1 1 1 1 1 1 1 2 2 2 2 2
3 4 5 6 7 8 9 0 1 2 3 4
1 1
1 2 3 4 5 6 7 8 9 0 1 2
PRIMARY
AIR TERMINAL UNIT
AIR
DP
PICKUP
1 1 1 1 1 1 1 1 1 1 2
9 0 1 2 3 4 5 6 7 8 9 0
1 2 3 4 5 6 7 8
TERMINAL HEAT DISCHARGE
AIR
M1 M2
ECHELON BUS
E-BUS NETWORK ACCESS
Fig. 1. Typical CVL4022NS-VAV1 box control application
TERMINAL HEAT DISCHARGE
AIR
M1
M1-REHEAT
VALVE
ACTUATOR
E-BUS
Fig. 2. Typical CVL4022AS-VAV1 box control application
being fed by the terminal box will use a TR2X Wall Module or
a Zio (TR71/TR75 only) Digital Wall Module for space
temperature determination and access to the LONWORKS
Bus network for operators. Fig. 1 shows a typical VAV box
control application for the CVL4024NS-VAV1 controller. Fig. 2
shows a typical VAV box control application for the
CVL4022AS-VAV1 controller. Table 2 shows the capabilities of
the CVL controllers.
TEMPERATURE SENSOR WITH
REMOTE SETPOINT ADJUSTMENT
AND UNOCCUPIED BYPASS
OVERRIDE BUTTON
TR2X
WINDOW CONTACT
M1 = DAMPER ACTUATOR
M2 = VALVE ACTUATOR
TEMPERATURE SENSOR
WITH REMOTE SETPOINT
ADJUSTMENT
3
RETURN
AIR
OCCUPANCY
CONTACT
M33867
RETURN
AIR
70
E-BUS
NETWORK
ACCESS
M33868
31-00083—02