Program: Mbfanswon - Universal Devices ISY-994i User Manual

Home automation

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The light switch is pressed into the job of 'occupancy detector' i.e. if the light is on it is

assumed that the bathroom is occupied.

Goals of the program as as follows:

• provide a single place to set the timeout value

• start the timer when the fan is turned off

• keep the fan running if the light is on

• shut off the fan after the initial time out (with no light on) OR the full time ot time

after the light has been switched off

Four programs combine to implement this:

1. MBFanSwON - Executes the timer. Is initiated when the fa is switched on - passes

control to a check program when te timeout is reached

2. MBFanCheck - Checks the status of the light and either keeps the fan running or

shuts the system down

3. MBLightSwOFF - Resets the timer to allow full run time before shut down

4. MBFanSwOFF - Shuts down the fan and stops the timer.

11.2.1.1Program: MBFanSwON

Main Bathroom Fan Switch On

Control 'BedAndbath / ~Devices / Main Bathroom Fan SW' is switched On

Wait 10 minutes

Run Program 'MBFanCheck' (If)

- No Actions - (To add one, press 'Action')

A timer is started when the fan is turned on. When it times out control is passed to s check

program to determine the next action.