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This is a field option internal timer which can be field programmed with WF analyzer to select a roomstat
cycle run time. If this downloaded run time (typically 90 minutes) is exceeded before the thermostat is
satisfied, the system automatically switches to either full electric elements or standby.
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SOT S – this is the longer set timer which allows transfer to standby if something might have
happened to the electric system unmonitored.
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SOT E – this must be shorter time than above, is typically used to overcome morning setback
pickup issues. In other words, if you would field download 30 minutes and you program the
setback stat to begin bringing up the temperature 30 minutes prior to the wakeup time; and the
system is not at the new higher temperature at the 30-minute point it will automatically jump to
all stages full on (DT flat) in order to more rapidly raise the building temperature. However, this
also means you will be "short cycling" the HP compressor during other heat calls. The
maximum run time for the compressor is then about 30 minutes at any time of the day or at any
particular heat call.
Notice: Effective program code chips after 7-7-04 the SOT S has been factory set at 90 minutes. This is
an added safety feature to minimize house freeze-up if something is wrong with the electric section,
switching over to standby furnace.
HANDHELD ANALYZER/LAPTOP SOFTWARE
This test tool and/or software is available for temperature offset, field altering the program chip
parameters and setup, and general assistance for troubleshooting.
See the enclosed "WarmFlo Information" document (HD320) for functional details.
Blower speed
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Both the ST and the OT can have temperature entries which provide a SPD A and SPD B
signal within the 10-pin cable for further interface with optional relays to further control
ECM variable speed motors. See next section.
01/10/2008
STAT OVERRIDE TIMER (SOT)
14
HI321
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