Page 12
Using a PIR Only for occupancy Detection
(Typically used in meeting or class room applications)
When you require the SMT-131 to turn the Heating and
Cooling on when people enter a room and off when
people exit the room such as maybe the case in a
conference or class room.
Wire the PIR directly to the DS (door switch input) of the
SMT-131. When movement is detected by the PIR sensor
the SMT-131 will turn the Air conditioning on maintain the
set point. After the last person has left the room the SMT-
131 will wait an installer defined time and then switch to
"Un-Occupied Mode"
Steps to use the SMT-131 in automatic occupancy detection mode.
1.
Wire the PIR movement detector into the DS (Door Switch) input.
2.
Set the PIR input delay period (See page 17 for information on setting the PIR
input delay) to the number of minutes that you wish the Airconditioning to
run after the last movement has detected in the space.
3.
Place a link permanently shorting the PIR input.
Manual Occupancy Input
The DI (Digital Input) & Com 0-10 terminals within the SMT-131 can be used to instantly force the
SMT-
131 into “
Un-occupied M
ode”. This input can be wired to a
simple card reader or other 3
rd
party system that may be pre-installed for room occupancy detection.
When the SMT-
131 is in “Un
-occupied M
ode” the display will go completely blank except for the
words “Unoccupied” in the top left
corner. If the optional HOT-243 hall way panel is installed its
display backlight will go out to let housekeeping know the room is empty. Modbus register 40004
also indicates occupancy status.
Doorbell
A built in doorbell feature is included with the SMT-
131 thermostat. This is normally activated by the
optional outside door station as described above or
via Modbus data link. In circumstances where this
is not convenient the Digital Input (DI) terminals
can be reassigned as a doorbell activation switch
with the digital input options detailed in the
installer menu.
(see page 16).
Simply place a momentary volt free switch across
“DI”
and
Com “0
-
V”
terminals to activate the doorbell. Once pressed, the doorbell will chime for about 10 seconds.
Outside Door Station
When coupled with the optional Smart Temp
door station the guest can set the room as
“Do Not Disturb”, call for housekeeping or be
alerted to visiting guests with a pleasant
doorbell chime. Hotel staff are informed
about the room status or guest’s needs by
text information displayed on the door
station LCD or the door station backlight
colours.