Honeywell AQS51, AQS61 User Manual

AQS51/61

CO2 / TEMPERATURE SENSOR WITH BUILT-IN CONTROLLER FOR WALL MOUNTING

INSTALLATION INSTRUCTIONS

GENERAL INFORMATION

The AQS51 and AQS61 CO2 / Temperature Sensors are used to measure the concentration and temperature of carbon dioxide in indoor air. The units can be configured as controllers with programmable outputs for both ON/OFF relay control and the linear control of e.g. mixed air dampers and fans. The wall mounting housing has been designed with snap-in features to minimize installation time.

The units can be directly connected to common VAV (Variable Air Volume) controllers, Direct Digital Control (DDC) devices, or standalone control systems. The linear output functions are pre-programmed as CO2 and temperature transmitters. In addition, the AQS51 and AQS61 have a relay output pre-programmed as a CO2 limiter. All functions can be modified from a PC (Windows 95, 98, NT) using the AQSUSPxx (version 4.0 or higher) software together with the AQS3/4-CABLE communication cable.

® U.S. Registered Trademark						EN1B-0189GE51 R0102
Copyright © 2002 Honeywell Inc. • All rights reserved

AQS 51/61 CO2 / TEMPERATURE SENSOR WITH BUILT-IN CONTROLLER

DIMENSIONS

Fig. 1. Dimensions (in mm) of AQS 51/61 (all oval holes have the same size)

WALL MOUNTING

Mounting the Wall Plate

The wall plate mounts vertically on the wall or on the wall wiring outlet box.

1.Position and level the wall plate on the wall and use a pencil to mark the mounting holes.

2.Remove the wall plate from the wall, drill two holes for M4 screws in the wall as marked, and insert dowel into the holes.

3.Position the wall plate over the holes and pull the wires through the wiring opening.

4.Loosely insert the mounting screws into the holes and tighten them (see Fig. 2).

Mounting System Unit onto Wall Plate

1.Bend the wires to the top to allow wiring connections to the terminals.

2.Engage first the top tabs of the sensor/controller protection case into the top holes of the wall plate and then press the lower edge of the case onto the wall plate to latch (see Fig. 3). Be careful not to damage the temperature sensor.

Fig. 3. Mounting the sensor/controller onto the wall plate

Fig. 2. Mounting of the wall plate

EN1B-0189GE51 R0102

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AQS 51/61 CO2 / TEMPERATURE SENSOR WITH BUILT-IN CONTROLLER

Removing System Unit from Wall Plate

Fig. 4. Removing the wiring terminal cover and the sensor/controller

1.Loosen the screw on top of the wiring terminal cover and remove the wiring terminal cover from the wall plate (see Fig. 4).

2.Pull out first the bottom of the sensor/controller, then disengage the top tabs and remove the top.

	Wiring				normally-open
		G+	G0 OUT1OUT2	M
						relay	OUT4
	R/T
	GND		0%
	+5 V
		startpoint20%
	RXD			current	voltage	current voltage	open
	TXD
							collector voltage
		selection		OUT1 OUT2 OUT4
		digital inputjumper

Fig. 5. Connections and jumpers on AQS51/61. The shaded positions represent the default settings

CAUTION

Check that all wiring is correctly completed before turning the power on! Do not connect wires when the unit is powered. Do not detach the sensor/controller from the wall plate when the power is on!

The AQS51/61 signal ground (M) is not galvanically separated from the power supply G0 terminal. If the analog output signals are connected to controllers or DDC systems, these units must have the same ground. If necessary, use

separate floating transformers for sensor and controller / DDC system.

1.Connect the correct wires to the terminals and securely tighten each terminal screw. Follow the actual job wiring diagrams if available or refer to Table 2 for terminal designations. A sticker is located on the inside of the terminal cover that identifies the terminals (see Fig. 5). All wiring must comply with local electrical codes, ordinances and regulations.

2.Place the wiring terminal cover by fitting the notches of the cover into the hooks of the wall plate. Tighten the locking screw (see Fig. 6).

Fig. 6. Installing the wiring terminal cover

Electrical Connections

CAUTION

The power supply must be connected to G+ and G0. G0 is considered as system ground. If the analog output is connected to a controller, the same ground reference must be used for the AQS51/61 unit and for the control system! Unless different transformers are used, special precautions must be taken!

NOTE: The signal ground of the AQS 51/61 is not galvanically separated from its power supply!

Table 1. Default output configurations for AQS51/61

	Terminal	Default output	Default output range
	OUT1	0...10 Vdc	0...2000 ppm CO2
	OUT2	0...10 Vdc	0...50 °C
	Relay	closed	> 1000 ppm CO2
		open	< 900 ppm CO2
	OUT4	closed	> 2000 ppm CO2
		open	< 1900 ppm CO2

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