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
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