Emerson E2 operation manual Separate Setpoints, AHU Zone Control

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.

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).

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.

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.

Listed below are wiring instructions for some of the inputs and outputs that are part of a typical AHU setup.

Inputs	Sensor Type	Wiring
		Instructions
Space Temperature	Temperature	See Table 9-1 on
		page 9-3
Space Humidity	Humidity	See Table 9-1 on
		page 9-3
Supply Air Temp	Temperature	See Table 9-1 on
		page 9-3
Return Air Temp	Temperature	See Table 9-1 on
		page 9-3
Outdoor Air Temp	Temperature	Set up as Out-
		door Air Provider
		in Global Data
		(see Section
		10.17).
Table 11-10- Suction Group Inputs

Inputs	Sensor Type	Wiring
		Instructions
Outdoor Air Humid	Humidity	Set up as Out-
		door Humidity
		Provider in
		Global Data (see
		Section 10.17).
Curtailment Device	Digital	Set up as Curtail-
		ment in Global
		Data (see Sec-
		tion 10.17).
Fan Proof	Digital	See Table 9-1 on
		page 9-3
Fan Proof Reset	Digital	See Table 9-1 on
		page 9-3
VS Inverter Alarm	Digital	See Table 9-1 on
		page 9-3
Enthalpy Switch	Digital	See Table 9-1 on
(Indoor and/or Out-		page 9-3
door)
Dewpoint Probe (for	Dewpoint	See Table 9-1 on
Economization)		page 9-3
Mixed Air Temp (ana-	Temperature	See Table 9-1 on
log economizers only)		page 9-3

Table 11-10- Suction Group Inputs

11-24 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013