Emerson E2 Manuel D’Utilisation
11-24
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E2 RX/BX/CX I&O Manual
11.6.11 Separate Setpoints
The Separate Setpoints strategy for AHU allows a Cut
In/Cut Out setpoint to be set up for each heat and cool
stage instead of just one cool and one heat setpoint set up
for each stage (Normal strategy). Dehumidification con-
trol can be performed while controlling with separate set-
points.
stage instead of just one cool and one heat setpoint set up
for each stage (Normal strategy). Dehumidification con-
trol can be performed while controlling with separate set-
points.
11.6.12 AHU Zone Control
Unlike MultiFlex RTU rooftop controller applications,
AHU applications are not required to be grouped into
Zone applications (AHUs are usually large enough to be
“zones” in and of themselves).
Zone applications (AHUs are usually large enough to be
“zones” in and of themselves).
However, if desired, you may associate an AHU Con-
trol application with a Zone application. The AHU will
then use the Zone’s Temperature Control setpoints, occu-
pancy state, summer/winter state, and economization and
dehumidification enable signals. More information on
Zone control is available in Section 11.7, Zone Control.
then use the Zone’s Temperature Control setpoints, occu-
pancy state, summer/winter state, and economization and
dehumidification enable signals. More information on
Zone control is available in Section 11.7, Zone Control.
11.6.13 Hardware Overview
To set up an AHU for control by an E2, numerous tem-
perature and humidity sensors for several different appli-
cations must be connected to the I/O Network, as well as
fan and cool proof checking devices, economization
checking devices, curtailment devices, and all of the heat-
ing, cooling, and dehumidification outputs.
cations must be connected to the I/O Network, as well as
fan and cool proof checking devices, economization
checking devices, curtailment devices, and all of the heat-
ing, cooling, and dehumidification outputs.
Listed below are wiring instructions for some of the
inputs and outputs that are part of a typical AHU setup.
Table 11-10
- Suction Group Inputs
Inputs
Sensor Type
Wiring
Instructions
Space Temperature
Temperature
Space Humidity
Humidity
Supply Air Temp
Temperature
Return Air Temp
Temperature
Outdoor Air Temp
Temperature
).
Outdoor Air Humid
Humidity
Set up as Out-
door Humidity
Provider in
Global Data (see
door Humidity
Provider in
Global Data (see
).
Curtailment Device
Digital
Set up as Curtail-
ment in Global
Data (see
ment in Global
Data (see
Fan Proof
Digital
Fan Proof Reset
Digital
VS Inverter Alarm
Digital
Enthalpy Switch
(Indoor and/or Out-
door)
(Indoor and/or Out-
door)
Digital
Dewpoint Probe (for
Economization)
Economization)
Dewpoint
Mixed Air Temp (ana-
log economizers only)
log economizers only)
Temperature
Inputs
Sensor Type
Wiring
Instructions
Table 11-10
- Suction Group Inputs