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9.2.9.
VAV Staged Units: B, C, D, and E Boxes
ECTO 0.01 option 3 (MSAV)
p
(
This configuration is a special-case application
This configuration is a special-case application
where the blower speed is staged by the factory
where the blower speed is staged by the factory
installed VFD for fixed speeds for different op-
eration. There are seven different speed stages,
ti
Th
one per cooling stage (4) one for ventilation one
one per cooling stage (4), one for ventilation, one
for heating and one for operation during smoke
for heating and one for operation during smoke
alarm modes. Network commands energize the
blower which will cycle with demand.
bl
hi h ill
l
9.3.
VFD Control
The M2 is only compatible
Th M2 i
l
tibl
with the factory installed
ith th
f
t
i
t ll d
variable frequency drives
variable frequency drives
(VFD) in VAV units used to
(VFD) in VAV units used to
control the supply blower
control the supply blower
and exhaust fan(s). The ana-
and exhaust fan(s) The ana-
log control for the VFDs is
log control for the VFDs is
0−10VDC. This manual uses
0−10VDC. This manual uses
percent (%) for all blower
percent (%) for all blower
and fan speeds. For exam-
and fan speeds. For exam
ple, 50% blower speed
ple, 50% blower speed
equals 30Hz equals 5VDC.
9.4.
Supply Bypass Damper Control
The M2 is only compatible with bypass
Th M2 i
l
tibl
damper actuators specified in the Engi-
damper actuators specified in the Engi
neering Handbook. Specified dampers
neering Handbook Specified dampers
are used to control the supply air vol-
are used to control the supply air vol-
ume for constant air volume w/bypass
ume for constant air volume w/bypass
damper (CAVB) zoning applications.
damper (CAVB) zoning applications.
The analog control for the actuator is a
The analog control for the actuator is a
2−10VDC with 10VDC being fully
2−10VDC with 10VDC being fully
closed. This manual uses percent (%)
closed. This manual uses percent (%)
for bypass damper position. For exam
for bypass damper position. For exam-
ple, 70% bypass damper position
p ,
%
yp
equals 4.4VDC.
)
O
Operation
Cooling compressor 1
Cooling compressor 2
Cooling compressor 3
diff
t
d t
Cooling compressor 4
Ventilation or economizer free cooling
Smoke Alarm Modes
ith d
d
Heating
(1)
Speed %
0
10
20
30
40
50
60
70
80
90
100
Bypass Damper Position (% )
ith b
p
p
ti
Staged % speed must be adjusted for each operation.
Motor Frequency (Hz)
0
6
12
18
24
30
36
42
48
54
60
0 (closed)
10
20
30
40
50
60
70
80
90
100
Page 39
9.
Supply Air Delivery
Staged Speed
(1)
Default ECTO
51%
0.05
51%
0.14
51%
0.15
51%
0.16
51%
0.03
51%
0.02
51%
0.04
VFD Control Voltage (VDC)
0
1
2
3
4
5
6
7
8
9
10
Control Voltage (VDC)
10
9.2
8.4
7.6
6.8
6.0
5.2
4.4
3.6
2.8
2.0
PRODIGYT M2 UNIT CONTROLLER
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