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T E C A L 6 5 0 H O P E R A T O R ’ S M A N U A L
Switch Test
The switch test indicates the switch point temperature of a thermostat by
detecting the making or breaking of the circuit made by the contacts of the
thermostat.
In Manual or Program Mode, the last line of the LCD indicates whether the
Switch is open or closed.
If the test is set to Switch Hold when a change is detected (except when the
Ramp Rate is set to MAX), the run is put into pause mode, and the letter 'P'
appears at the bottom right hand corner of the display. Either stop the run by
pressing the
ON/OFF
key, to return the unit to ambient temperature, or restart
by pressing
PAUSE,
to continue heating or cooling.
If the test is set to switch, when a change is detected, the run continues cycling
to the set point temperature.
Note that it is not possible for both "User Probe" and "Switch" tests to be active
at the same time; selecting one automatically disables the other.
Positive connection
Negative connection
(Red)
(Black)
