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Window Contact
The window contact input (WC) is used to automatically disable the HVAC system if a window is
left open. This is done to prevent energy waste by trying to heat or cool an open room.
The SMT-131 window input can be set for a Normally Open (switch open when window is closed)
or normally closed logic (switch closed when window is closed). When the window is left open for
longer than the pre-set time (0 to 300 seconds) the SMT-131 will automatically turn OFF. The text
“OFF” will flash in the LCD to indicate that the remote window (or door switch) is holding the
SMT-131 in off mode. The wall controller will prohibit all changes.
The SMT-131 will automatically restart once the window is closed.
The Installer menu option 28 “Window Input Logic” and option 29 “Window Input Delay”
(page15)
sets the window detection logic in the SMT-131.
Door Switch
The Door switch input (DS) is used by the SMT-131 for 2 functions.
1)
To detect that the door has been opened and then closed to let somebody into or out
of the room.
2)
To detect if the door has been left open.
The SMT door switch input can be set for a Normally Open (switch open when door is closed) or
normally closed logic (switch closed when door is closed). The Installer menu 30 “Door Input
Logic” and option 31“Door Input Delay”
(page
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)
sets the door
detection logic in the SMT-131.
Entering or exiting the room.
Once the door is opened and then closed the SMT-131 will begin its occupancy detection process
using the PIR input described below. Based on the outcome of this process the SMT-131 will
remain on and permit guest interaction with the SMT-131 (adjust mode and set point for
example), or switch to “un-occupied” mode where the SMT-131 will substitute the guest set point
and mode for the installer pre-set values.
Door Left Open
When the door is left open for longer than the pre-set time (0 to 300 seconds) the SMT-131 will
automatically turn OFF. The text “OFF” will flash in the display to indicate that the remote door
(or window switch) is holding the SMT-131 in off mode. This is done to prevent energy waste by
trying to heat or cool an open room.
The SMT-131 will automatically restart once the door is closed.
PIR input
A PIR (passive infra-red) movement detector can be directly wired to the SMT-131 “PIR” input. As
movement is detected by the PIR it will send multiple On/Off pulses to the SMT-131 every time it
detects movement. The SMT-131 using this data along with door switch data will determine the
occupancy status of the room and behave accordingly. Note, the PIR must be separately
powered, typically from a 12VDC supply.
Summary of Contents for SMT - 131
Page 1: ...SMT 131 Manual Ver 2 1...
