AAON Orion ASM01819 Quick start guide

E-BUS Digital Room Sensor
Technical Guide

TABLE OF CONTENTS
OVERVIEW....................................................................................................................................... 3
BASIC OPERATION.......................................................................................................................... 4
Sensor Operation ..................................................................................................................................................... 4
LED Operation ......................................................................................................................................................... 4
MOUNTING AND WIRING ................................................................................................................ 5
Dimensions .............................................................................................................................................................. 5
Environmental Requirements ................................................................................................................................... 5
Important Wiring Considerations .............................................................................................................................. 5
Mounting .................................................................................................................................................................. 5
SENSOR OPERATION ...................................................................................................................... 6
Main Sensor Display Screens....................................................................................................6
Temperature and Humidity Status Screen .......................................................................................................... 6
Outside Air Temperature Humidity Status Screen............................................................................................... 6
Unit Information Screen ...................................................................................................................................... 6
Setpoint Adjust Screen ....................................................................................................................................... 7
Operation Modes ................................................................................................................................................ 7
TROUBLESHOOTING....................................................................................................................... 8
Temperature Sensor Testing for the Temperature Only Sensor ............................................................................... 8
APPENDIX ..................................................................................................................................... 10
Sensor Confi guration and Test Screens ................................................................................................................ 10
Connecting the E-BUS Digital Room Sensor to the HVAC Unit Controller ............................................................ 12
Connecting a Wall Mounted E-BUS CO2 Sensor to the HVAC Unit Controller ...................................................... 13
Connecting the E-BUS Digital Room Sensor to the VAV/Zone Controller ............................................................. 14
Connecting a Remote Sensor ................................................................................................................................ 15
Mounting Plate Dimensions ................................................................................................................................... 18
PART NUMBER CROSS REFERENCE TABLE
PART DESCRIPTION AAON P/N
E-BUS LCD Digital Room Sensor Temp Only ASM01819
E-BUS LCD Room Sensor Temp & Humidity ASM01820
E-BUS Digital Room Sensor Temp & Humidity (No Display) ASM02221
Wall-Mounted E-BUS CO2 Sensor ASM01829
Mounting Plate G026490
Return Air Duct Temperature Sensor - 12” P87140
VCCX2 Controller ASM01698
VCB-X Controller ASM01862
VAV/Zone Controller P.D. & P.I. ASM01627 / ASM01630
AAON, Inc.
2425 South Yukon Ave.
Tulsa, OK 74107-2728
www.aaon.com
Factory Technical Support Phone: [phone]
Controls Support Phone: [phone]
AAON Manual P/N: G042540, 01N
Copyright February 2019 AAON, Inc.
AAON, Inc. assumes no responsibility for errors or omissions.
This document is subject to change without notice.
This manual is also available for download from our
website—aaon.com—where you can always find the
latest literature updates.

E-BUS Digital Room Sensor Technical Guide 3
OVERVIEW
Overview
The E-BUS Digital Room Sensors are used to sense Space Temperature
only or Space Temperature & Space Humidity. See Figures 1 & 2.
The ASM01819 is the Space Temperature Sensor only model and the
ASM01820 & ASM02221 are a combination Space Temperature & Space
Humidity Sensor model. The ASM02221 model includes an enclosure
without LCD display, front LEDs, and buttons.
Any of the sensors can be used with the VCCX2 Controller and VCB-X
Controller and connect to the controller using various lengths of EBC
E-BUS cables connected between the controller and the sensor. The
EBC E-BUS cables should not run in conduit with other AC line voltage
wiring or with any conductors carrying highly inductive loads.
The ASM01819 model can be used with the VAV/Zone Controller. It is
either hard-wired or connected via EBC E-BUS cable.
The ASM01819 & ASM01820 sensors provide the following useful
functions:
• Provides 112 x 64 monochrome Graphical LCD display with
LED backlight
• Displays the Current Space Temperature
• Displays Outdoor Air Temperature (if controller is confi gured
with an OA Temperature Sensor)
Features
Figure 1: ASM01819 & ASM01820 E-BUS Digital
Room Sensor with LCD Display and Buttons
Display Override
OVERRIDE ALARM
• Displays the Current Space Humidity (ASM01820 model
only)
• Displays Outdoor Air Relative Humidity (ASM01820 model
if controller is confi gured with an OA Humidity Sensor)
• Displays the Current Zone Setpoint Temperature when slide
adjust is entered
• Equipped with Push Buttons for changing the Zone Setpoint
Temperature
• Equipped with an Override Button for forcing the VAV/Zone
Controller or VCCX2 / VCB-X Controller into Occupied
Operation from Unoccupied Operation
• Provides graphics to indicate the Mode of Operation
• Allows connection of a remote 10K Ohm, Type III thermistor
temperature sensor (or 4 sensor averaging array). See
Connecting a Remote Sensor section in the Appendix on
page 15 for details.
• Provides LEDs to indicate Schedule Override, Button Push,
Alarms, and Communications
• Can display Temperature reading from a Remote Temperature
Sensor (see Figures 21 & 22, pages 15 & 16 for instructions)
Figure 2: ASM02221 E-BUS Digital Room Sensor -
No LCD Display or Buttons

BASIC OPERATION
E-BUS Digital Room Sensor Technical Guide4
Figure 3: E-BUS Digital Room Sensor Components
Alarm LED
Sense
LED
Override
LED
Override
Button
Display
Button
Up
Button
Down
Button
LCD
Display
Cover Set
Screw
MICROCHIP
PIC24HJ
256GP206
Back View
Remote Thermistor
Sensor Connector
Front View
E-BUS Cable
Connection
+12Vdc
GND
-COM
SHLD
Comm LED
(Not visible
with back
cover on)
Display Override
OVERRIDE ALARM
Sensor Operation
When power is fi rst applied to the ASM01819 E-BUS Digital Room
Sensor, the sensor will display the Current Room Temperature and
the current setting of the slide off set. The ASM01820 model will also
display Relative Humidity.
NOTE: The sensor readings are not accurate until the controller
that the sensor is connected to is done calibrating.
The sensor has 4 buttons—<Display>, <Override>, <Up>, and
<Down>. You can also access certain functions by touching the area
below the <Display> and <Override> buttons. The sensor has 4
LEDs—one to indicate an Override, one to indicate an Alarm, one to
indicate Communications, and one to indicate that a button has been
pressed. See Figure 3 for LED and Button Descriptions.
An icon for the current mode of operation will appear in the sensor
display. The operation mode icons are a Snowfl ake for Cooling Mode,
a Flame for Heating Mode, a Fan in motion for Vent Mode, and a Moon
for Unoccupied Mode. When the unit is in Unoccupied Mode, the
screen’s background will turn dark. See Figure 9, page 7 for examples
of operation modes.
Buttons and LEDs
LED Operation
Refer to Figure 3 for LED locations.
Alarm LED: The Alarm LED will blink when there is an alarm from
the Controller.
Sense LED: The Sense LED will blink when the sensor gets a valid
touch.
Override LED: The Override LED is inoperable when in Occupied
Mode. In Unoccupied Mode, if you touch the <Override> button, the
Override LED will blink, indicating an override request. The Control-
ler will respond by sending the unit into override. The Override LED
will then stay on for the duration of the Override. Any time the Unit
is in Override, you can request to cancel the override by touching the
<Override> button, and the Override LED will blink. The Unit will
then cancel the override. The Override LED will then turn off .
Comm LED: The Comm LED located on the back of the sensor
blinks on whenever communications are sensed.

E-BUS Digital Room Sensor Technical Guide
MOUNTING AND WIRING
5
Mounting
CAUTION: Do not touch the front face of the sensor while you
are plugging in the modular sensor cable. Touching the front face
of the sensor while plugging in the cable may prevent proper initial-
ization and keep the buttons on the sensor from working properly.
The E-BUS Digital Room Sensor is designed to be mounted to a vertical
2” x 4” electrical box recessed in the wall. If the wall cannot be pen-
etrated, a plastic surface mount box such as those made by WiremoldTM
may be used to mount the sensor to the wall surface. The Sensor should
be mounted at least 5 feet above the fl oor.
The Sensor is mounted by removing the front cover and fastening the
housing base to the electrical box using the supplied (2) 6/32” x 1” machine
screws. The modular cable is then plugged into the phone jack located on
the circuit board that is mounted on the cover. The cover is then placed
onto the housing base, and the Allen Screw on the bottom of the base is
adjusted to hold the cover in place. A locking screw secures the sensor
to the wall. See Figure 4 for E-BUS Digital Room Sensor dimensions.
Optional Mounting Plate
Included with the Digital Room Sensor is a mounting plate that
can be used, if necessary, to cover the sensor sheet rock opening.
This mounting plate screws onto the back of the housing base.
The mounting plate is then mounted and covers the recessed space
in the wall. A locking screw secures the sensor to the wall. See
Figure 25, page 18 for dimensions.
Environmental Requirements
The E-BUS Digital Room Sensor needs to be installed in an environment
that does not exceed a temperature greater than 150°F or less than -30°F
and does not exceed 90% relative humidity levels (non-condensing).
Indoor Reading Range
The E-BUS Digital Room Sensor’s Indoor Reading Range is 40°F to
120°F and 0-100% RH (RH is available on the ASM01820 & ASM02221
models). Its temperature reading accuracy is +/- .8°F, and its RH reading
accuracy is +/- 3%. Its sensor element is the integral communicating
digital sensing device or external Type III Thermistor 10K Ohm @ 77°F.
Outdoor Reading Range
If your E-BUS Digital Room Sensor is set up to read an Outdoor Air
Temperature Sensor, any outdoor air temperature below -40°F will not
appear on the E-BUS Digital Room Sensor’s display.
Important Wiring Considerations
The E-BUS Digital Room Sensors connect to the VCCX2 or VCB-X
Controller using various lengths of EBC E-BUS cable connected between
the controller and the sensor. The EBC E-BUS cables should not run
in conduit with other AC line voltage wiring or with any conductors
carrying highly inductive loads. See Figure 18, page 12 for wiring.
Dimensions and Mounting
Figure 4: E-BUS Digital Room Sensor Dimensions
MICROCHIP
PIC24HJ
256GP206
4.55”
2.80
Front View Side View Back View
0.69
1.1
1.81
1.87
0.49
Remote Thermistor
Sensor Connector
0.81
+12Vdc
GND
-COM
SHLD
Display Override
OVERRIDE ALARM

SENSOR SCREENS
E-BUS Digital Room Sensor Technical Guide
6
LCD Display Screens
Main Sensor Display Screens
There are 3 Main Sensor Display Screens. The fi rst screen displays the
Current Room Temperature, Operation Mode, Slide Off set, and RH (RH
is available on the ASM01820 model). The second screen displays the
Outside Air Temperature and/or Humidity if Outdoor Air Temperature
and/or Outdoor Air Humidity that is being monitored. The third screen
displays the unit information for the controller that the Digital Room
Sensor is connected to.
Temperature and Humidity Status
Screen
The Main Display Screen dis-
plays the current room tem-
perature, the humidity in the
room (RH is available on the
ASM01820 model), the current
setting of the slide off set, and
an icon for the current mode of
operation once the controller it is
connected to is done calibrating.
The diff erent icons shown are a
Snowfl ake for cooling mode, a
Flame for heating mode, a Fan in
motion for vent mode, and a Moon for unoccupied mode. When the unit
is in unoccupied mode, the screen’s background will turn dark. Refer to
Figure 9, page 7 for operation mode screen examples.
Figure 5: Main Display
Screen
Figure 6: Outdoor Status
Screen
Figure 7: Unit
Information Screen
Outside Air Temperature Humidity
Status Screen
If the connected controller is
receiving an outdoor air tempera-
ture and/or humidity broadcast,
touching <Display> will fi rst
bring up the Outdoor Status
Screen.
Unit Information Screen
Touching <Display> again will
bring up the Unit Information
Screen which contains the con-
troller’s address or ID number,
screen ID, and software version
of the controller connected to
the sensor.

E-BUS Digital Room Sensor Technical Guide
SENSOR SCREENS
7
Setpoint Adjust Screen
Touching <> or <> will dis-
play the Setpoint Adjust Screen.
You can adjust the cooling and
heating setpoints from this screen
based on the VAV/Zone, VCCX2,
or VCB-X Controller slide off set
setpoint. For example, if the con-
nected controller’s Max Slide
Off set Setpoint is set for fi ve, you
can adjust the setpoint up fi ve
degrees and down fi ve degrees.
NOTE: If the VAV/Zone or Unit Controller’s slide off set setpoint
is set to Zero, this screen will not appear when you touch
<> or <>.
Figure 9: Operation Mode Screens
Cooling Mode
with Snowfl ake Icon
Heating Mode
with Flame Icon
Vent Mode
with Fan in Motion Icon
Figure 8: Setpoint Adjust
Screen
Unoccupied Mode
with Moon Icon
Operation Modes
Refer to Figure 9 for operation mode screen examples. The diff erent
icons shown are a Snowfl ake for cooling mode, a Flame for heating
mode, a Fan in motion for vent mode, and a Moon for unoccupied
mode. When the unit is in unoccupied mode, the screen’s background
will turn dark.
LCD Display Screens

TROUBLESHOOTING
E-BUS Digital Room Sensor Technical Guide8
Troubleshooting the Temperature Only Sensor
Figure 10: Temperature/Resistance Testing for ASM01819 - Temperature Only Sensor

E-BUS Digital Room Sensor Technical Guide
TROUBLESHOOTING
9
Temperature/Resistance Chart
Table 1: Temperature/Resistance for Type III 10K Ohm Thermistor Sensors
Temperature – Resis-
tance –for Type III 10K
Ohm Thermistor Sensors
Temp
(ºF)
Resistance
(Ohms)
-10 93333
-5 80531
0 69822
5 60552
10 52500
15 45902
20 40147
25 35165
30 30805
35 27140
40 23874
45 21094
50 18655
52 17799
54 16956
56 16164
58 15385
60 14681
62 14014
64 13382
66 12758
68 12191
69 11906
70 11652
Temperature – Resis-
tance – for Type III 10K
Ohm Thermistor Sensors
Temp
(ºF)
Resistance
(Ohms)
71 11379
72 11136
73 10878
74 10625
75 10398
76 10158
78 9711
80 9302
82 8893
84 8514
86 8153
88 7805
90 7472
95 6716
100 6047
105 5453
110 4923
115 4449
120 4030
125 3656
130 3317
135 3015
140 2743
145 2502
150 2288

APPENDIX
E-BUS Digital Room Sensor Technical Guide
10
Pixel Test Screen
To select the first option—
Pixels—touch <> while at
the Sensor Configuration &
Test Screen (Figure 12). The
Pixel Test Screen tests the pixels
of the LCD display, allowing
you to make the screen white
with black characters, black
with white characters, or a
black or white screen. To exit
this screen, touch <Display>.
Sensor Info & LED Test Screen
To select the second option—
Info & LEDS—touch <>
while at the Sensor Configura-
tion & Test Screen (Figure 12).
The Sensor Info & LED Test
Screen shows the version of
software that the sensor is run-
ning and allows you to test the
LEDs that are used on the con-
troller. Touching <> will turn
the LEDs on and touching <>
will turn the LEDs off . To exit
this screen, touch <Display>.
Sensor Configuration and Test Screens
Sensor Configuration and Test
Screens
To access the Sensor Configuration & Test Screens, you fi rst need to
access the Unit Information Screen by touching <Display> while at
the Main Display Screen.
NOTE: While in the Sensor Configuration & Test Screens, the
<Display> button functions as an exit key to return to the
previous screen or menu. After a few seconds, however,
the sensor will automatically revert to the Main Display
Screen. Refer to Figure 11 when reading the instructions
that follow.
Sensor Configuration & Test Screen
While the Unit Information
Screen is being displayed, you
can enter the Sensor Configura-
tion & Test Screen options by
touching simultaneously below
the <Display> and <Over-
ride> buttons. (See Figure 11
which shows where to touch to
access this option.)
Override
Button
Display
Button
Touch
Here
Touch
Here
Display Override
Figure 11: E-BUS Digital Room Sensor Buttons
Figure 12: Sensor
Confi guration & Test
Screen
Figure 14: Sensor Info &
LED Test Screen
Figure 13: Sensor Info &
LED Test Screen

E-BUS Digital Room Sensor Technical Guide
APPENDIX
11
LCD Backlight Test Screens
To select the third option—
BACKLT—touch <Override>
while at the Sensor Configuration
& Test Screen (Figure 12, page
10). This option allows you to
control when the LCD backlight
turns on and off . You can con-
fi gure the backlight to stay on at
all times, remain off at all times,
or to come on when any button
is touched on the sensor.
To exit this screen, touch <Dis-
play>.
Sensor Configuration and Test Screens
Thermistor Averaging Screen
To select the fourth and fi nal op-
tion—THRM AVG—, while at
the Sensor Configuration & Test
Screen (Figure 12, page 10),
touch simultaneously below the
<Display> and <Override>
buttons. (See Figure 11, page
10 which shows where to touch
to access this option.)
This option allows you to set the
rate—from 1-15 seconds—at
which the sensor takes a new
temperature reading. Touch <>
to increase the number of seconds
and touch <> to decrease the
number of seconds.
To exit this screen, touch <Dis-
play>.
NOTE: The sensor takes the average of the last 10 readings based
on the number that is entered in this screen. For example,
if you want a 3-second sample, the sensor will take the
average of the last 10 readings every 3 seconds over a
30-second span. Therefore, if you have your sensor next
to an outside doorway, you would want to enter a higher
number for your sample to give a more accurate read-
ing for the room temperature in case the outside door is
opened often.
Figure 15: Backlight Test
& Confi guration Screen
Figure 16: Temperature
Averaging Screen
Address Screen
To access the Address Screen,
while at the Thermistor Averag-
ing Screen, (Figure 16), touch the
<Override> button.
This option allows you to set the
address—from 1-10. Touch <>
to increase the number and touch
<> to decrease the number.
The default is 1.
To exit this screen, touch
<Display>.
Figure 17: Address
Screen
SENSOR
1
COMM
ADDRESS

APPENDIX
E-BUS Digital Room Sensor Technical Guide
12
E-BUS Digital Room Sensor to HVAC Unit Controller Wiring
E-BUS Digital Room Sensor to HVAC
Unit Controller Wiring
The E-BUS Digital Room Sensor connects to the VCCX2 or VCB-X
Controller with the EBC E-BUS expansion cable.
The E-BUS Digital Room Sensor should be mounted at approximately
5 Ft. above the fl oor on the wall in an area that does not have drafts or
is exposed to direct sunlight. See Figure 18 for wiring details.
Figure 18: E-BUS Digital Room Sensor Wiring

E-BUS Digital Room Sensor Technical Guide
APPENDIX
13
Figure 19: ASM01829 – Wall Mounted E-BUS CO2 Sensor Wiring
E-BUS CO2 Wall Mounted Sensor to
HVAC Unit Controller Wiring
The ASM01829 Wall Mounted E-BUS CO2 Sensor is used to monitor
CO2 levels in the space served by the HVAC unit. The CO2 Sensor con-
nects to the VCCX2 or VCB-X Controller with an EBC E-BUS cable. It
can be daisy-chained with the E-BUS Digital Room Sensor for applica-
tions requiring both a room CO2 sensor and room temperature sensor.
It should be mounted at approximately 5 Ft. above the fl oor on the wall
in an area that does not have drafts or is exposed to direct sunlight. See
Figure 19 for wiring details and installation notes.
Wall Mounted E-BUS CO2Sensor Wiring
NOTE: The ASM01831 Duct Mounted E-BUS CO2 Sensor can
be used if desired instead of the Wall Mounted E-BUS
CO2 Sensor. However, the E-BUS Digital Room Sensor
does not directly connect to the Duct Mounted E-BUS
CO2 Sensor. See the Duct Mounted E-BUS CO2Sensor
Technical Guide for Duct Mounted E-BUS CO2 Sensor
wiring details.

APPENDIX
E-BUS Digital Room Sensor Technical Guide
14
E-BUS Digital Room Sensor to VAV/Zone Controller Wiring
E-BUS Digital Room Sensor to VAV/
Zone Controller Wiring
The Temperature Only E-BUS Digital Room Sensor connects to the
VAV/Zone Controller with an EBC E-BUS expansion cable. It can also
be hard-wired to the VAV/Zone Controller.
The E-BUS Digital Room Sensor should be mounted at approximately
5 Ft. above the fl oor on the wall in an area that does not have drafts or
is exposed to direct sunlight. See Figure 20 for wiring details.
Figure 20: VAV/Zone Controller E-BUS Digital Room Sensor Wiring

E-BUS Digital Room Sensor Technical Guide
APPENDIX
15
Connecting a Remote Sensor
Connecting a Remote Sensor
If the job requires this Sensor to be mounted outside of a conditioned
space, a remote Standard Space Sensor (ASM02227) or Return Air Tem-
perature Sensor (P87140), or any 2-wire 10K Ohm, Type III thermistor
temperature sensor can be hard-wired to the E-BUS Digital Room Sen-
sor. Other versions of the AAON standard space sensors (ASM01638,
ASM01642, ASM01643) with slide adjust and/or override button should
not be used as the remote sensor.
Contact AAON Controls for wiring information if a four sensor averag-
ing array will be used as the “remote sensor”.
See Figure 21 for Return Air Temperature Sensor wiring. See Figure
22, page 16 for Space Sensor wiring.
E-BUS Digital Room Temperature Only Sensor
Disconnect the modular cable from the E-BUS Digital Room Sensor
before performing the following modifi cations.
If using the Temperature Only version of the Digital Room Sensor, you
must fi rst remove the Sensor’s back cover. You will see a loop of wire
hanging off of the sensor circuit board. See Figure 23, page 17. This is
the external thermistor loop wire. Clip the external thermistor loop wire
so that the sensor will read the remote temperature input. Be sure to cut
Figure 21: Return Air Temperature Sensor Wiring
the ends of the wire close to the circuit board so that the sensor loop wire
ends won’t short between each other. The remote sensor then wires to the
remote sensor terminal block on the back of the Digital Room Sensor.
If using the Standard Space Sensor as the remote sensor, you must clip
off the C1 capacitor from the back of the Sensor Be sure to cycle power
to begin reading the remote sensor. See Figure 22, page 16.
E-BUS Digital Room Temperature and Humidity
Sensor
Disconnect the modular cable from the Digital Room Sensor before
performing the following modifi cations.
If using the Temperature and Humidity versions of the Digital Room
Sensor, you only need to wire the remote sensor to the remote sensor
terminal block on the Digital Room Sensor. DO NOT CLIP OFF OR
REMOVE the temperature/humidity sensor element on the Digital
Room Sensor. See Figure 24, page 17. When the remote temperature
sensor is wired in, it will override the on-board temperature value of the
Digital Room Sensor, even though the sensor element remains attached.
If using a Standard Space Sensor as the remote sensor, you must clip off
the C1 capacitor from the back of the sensor. Be sure to cycle power to
begin reading the remote sensor. See Figure 22, page 16.

APPENDIX
E-BUS Digital Room Sensor Technical Guide
16
Connecting a Remote Sensor
Figure 22: Attaching the ASM02227 Space Room Sensor

E-BUS Digital Room Sensor Technical Guide
APPENDIX
17
Connecting a Remote Sensor
Figure 23: Wire Clipping Instructions For Digital Room Temperature Only Sensor
Figure 24: Instructions For Digital Room Temperature & Humidity Sensor

APPENDIX
E-BUS Digital Room Sensor Technical Guide
18
Mounting Plate Dimensions
Figure 25: G026490 Mounting Plate Dimensions
1.64
3.285
0.060
5.045
3.27
Optional Mounting Plate
Included with the Digital Room Sensor is a mounting plate that
can be used, if necessary, to cover the sensor sheet rock opening.
This mounting plate screws onto the back of the housing base.
The mounting plate is then mounted and covers the recessed space
in the wall. A locking screw secures the sensor to the wall. See
Figure 25 for dimensions.

E-BUS Digital Room Sensor Technical Guide
NOTES
19

2425 South Yukon Ave • Tulsa, OK • 74107-2728
Ph: [phone] • Fax: [phone]
AAON® Manual P/N: G042540, 01N
Printed in the USA • © February 2019 AAON • All Rights Reserved
AAON Factory Technical Support: 918-382-6450
techsuppor[email protected]
AAON Controls Support: 866-918-1100
Monday through Friday, 7:00 AM to 5:00 PM
central standard time.
NOTE: Before calling Technical Support, please have the
model and serial number of the unit available.
PARTS: For replacement parts please contact your local
AAON Representative.