Honeywell AQS61, AQS51 User Manual

GENERAL

The AQS51and AQS61 temperature sensor / controller feature two push buttons (MENU and ESC), accessible behind the flip-down lid on the front of the sensor / controller, providing a display selection mode and a maintenance mode for testing and calibration purposes. In the case of the ductmounted version (AQS61-KAM), activation of the push buttons is simulated by short-circuiting the two halves of the zig-zag trace using a screwdriver.

The YELLOW LED will acknowledge each successful push by a short flash. More information is shown on the LCDdisplay.

All functions available with the push buttons are also accessible via the UART serial communication port by using a PC together with the User Interface Program Software AQS-USP22. This tool also provides more complex configurations, calibrations, and performance checkouts of these sensors/controllers.

AQS51/61

COMBINED CO2-/TEMPERATURE ROOM SENSOR/CONTROLLER

SERVICE & CHECKOUT INSTRUCTION

IMPORTANT The use of the service mode using the push buttons or PC is restricted to competent trained service personnel only.

A good knowledge of the sensor/controller functionality and the service mode is required to perform this checkout or calibration.

Display Mode (AQS61)

In this mode, the push button MENU is used to select the actual value indicated on the display - CO2 and temperature alternating, error code, CO2, temperature, output signal OUT1, OUT2 and OUT4, all in percent.

After restart, the display indication will always return to the default display mode (CO2 and temperature alternating).

Functional Test

A simple and visual functional test can be easily performed. Take a breath and blow onto the sensor from a distance of a few centimeters. The sensor will detect a rapid increase in the carbon dioxide concentration. As a result, the red LED will light up if the CO2 level exceeds 1000 ppm (sensor default setting).

If the sensor is connected to a controller, the flow of the ventilation system will eventually increase by changing the fan speed or opening a damper actuator (depending on the installation/application).

In the case of the AQS61, the present output values of the outputs OUT1, OUT2 and OUT4 can be viewed on the LCD by pressing MENU four to six times. The displayed values are in %FS (percent full scale) and can be compared with the actual output value measured using a multimeter.

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Copyright © 2003 Honeywell Inc. • All rights reserved

AQS51/61 COMBINED CO2-/TEMPERATURE ROOM SENSOR/CONTROLLER

MAINTENANCE

General

The AQS51/61 is basically maintenance-free. An internal self-adjusting calibration function takes care of normal longterm drift associated with the CO2 sensor. To ensure the highest accuracy, a time interval of max. five years is recommended between CO2 calibrations, unless some special situations have occurred.

A zero-point calibration can be performed using the push button functions (for AQS61), or (in the case of a complete overview) using a PC together with the AQS-USP22 software version 4.0 (or higher). This software and a special RS232cable are included in the service kit AQS-F0005. The cable is to be connected to the UART port slide connector. To change control parameters and for recalibration (CO2 and temperature), this PC tool must be used. The check can be done on site without interfering with the ventilation system.

Maintenance Mode AQS61

A number of execution options as listed in Table 1 for test functions and calibrations are available from the MAINTENANCE MENU. Access to this maintenance level is provided only from the selected display mode OUT1. By pushing the MENU and the ESC button simultaneously as ENTER command, the sensor/controller leaves the standard display mode OUT1 and enters the maintenance selection mode. With the MENU button, the required maintenance function can be selected (see Table 1). The selected mode is shown on the display.

Always use the ESC button to return to the previous MENU selection mode, especially if any uncertainty exists regarding the operation needed to return back to the DISPLAY MODE. The ENTER command (push MENU and ESC simultaneously) may result in the execution of functions with temporary or permanent changes to parameters affecting sensor/controller outputs and system operation. Prior to such an execution, a “SurE” message is shown on the display.

Table 1. Maintenance functions available on AQS61. Time limit refers to an internal time-out that returns the LCD and maintenance function back to normal. ENTER is a simultaneous pressing of MENU and ESC.

Function	Display	Time-			Functional description
line		limit
			For checking/adjusting connected auxiliary equipment.
			Provides access to a sub-menu where output selection XX = 1...4 is done by pressing
			MENU. The selected output FOXX (= OUT1...OUT4) is fixed by pressing ENTER. For XX
			= 1 & 2 LO always gives 2 V / 4 mA independent of the position of the start point selection
			jumper, but voltage or current according to the position of the jumper. OFF/ON is true for
1	FOUt	no	the relay and open collector outputs.
			FO1 & 2	LO	-selected output is fixed to 2 V / 4 mA
			FO3	LO	-relay contact is open
			FO4	LO	-OUT4 is 0 V/open state
			FOXX	HI	-selected output is fixed to 10 V / 20 mA/closed state
2	bCAL	yes	CO2 -sensor calibration with fresh air. An easy way to correct a zero-point error of a
			sensor. The sensor needs fresh air (380...420 ppm CO2). The calibration must be
			confirmed by pushing ENTER.
3	CAL	yes	Zero-point calibration of the CO2 sensor. The sensor needs zero gas. See the
			calibration instruction of zero-point calibration. The calibration must be confirmed by
			pushing ENTER.

FUNCTIONS

FOUtFixing of Analog and Digital Outputs

This is a functional test for final control elements connected to the outputs. When entering this operation mode, the output is set automatically to 20%, 0% or 100% of full scale as listed in Table 1 and Fig. 1.

Pushing the MENU and ESC button simultaneously for ENTER, provides access to the output selection mode.

Select with the MENU button the output (F01 to F04) to be fixed. Push MENU and ESC (ENTER) and select with the MENU button LO or HI to fix the output to a low or high value as requested.

Push MENU and ESC (ENTER) to fix the output.

To release (unfix) the temporary manual output override, push the MENU button in fixed state.

NOTE: In the event of a power failure or power-off stage, no automatic reset of the selected fixed state is performed. To unfix the output(s) in the power-on mode, enter the maintenance mode FOUt and release the fixed output(s) as described above.

EN2B-0224GE51 R0903

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