56
13.5. Supply Constant Air Volume (CAV) with Zone Bypass Damper Control
Configuration ID 2
position
7
must be set to
Y
to enable Prodigy 2.0 Zone bypass operation with Constant Air Volume.
This configuration is used for L Connection or third-party zoning systems that utilize a blower bypass damper for
controlling duct static pressure. The M3 unit controller controls duct static pressure by reading the duct pressure and
varying the bypass damper position between minimum and maximum positions. There are four different set points: one
for cooling, one for ventilation, one for operation during smoke alarm modes, and one for heating. All blower on and off
delays still apply.
The minimum/maximum damper positions and static pressure set points are listed as follows (for further details, see
Zone Line Installation instruction 505,090M):
Table 36. Supply CAV with Zone Bypass Damper Control
Operation
Minimum Position
Maximum Position
Duct Static Pressure
Parameter
Default
Parameter
Default
Parameter
Default
Cooling
38
20%
40
100%
37
1.0” in H20.
Ventilation
38
20%
40
100%
35
1.0” in H20.
Smoke Alarm Modes
38
20%
40
100%
34
1.0” in H20.
Heating
39
20%
40
100%
36
1.0” in H20.
13.5.1.
Bypass Damper Actuator
The M3 unit controller is only compatible with bypass damper actuators specified in the Product Specification bulletin and
specified during unit configuration purchase and fieldinstalled. Specified dampers are used to control the supply air
volume for constant air volume with bypass damper zoning applications. The analog control for the actuator is a 210VDC
with 10VDC being fully closed. This manual uses percent (%) for bypass damper position. For example, 70% bypass
damper position equals 4.4VDC.
Table 37. Bypass Damper Actuator
Bypass Damper Position (% )
Control Voltage (VDC)
0 (closed)
10
10
9.2
20
8.4
30
7.6
40
6.8
50
6
60
5.2
70
4.4
80
3.6
90
2.8
100
2
