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BIAC User Manual Installation
set to a value lower than current HSP,
the HSP will be adjusted to the CSP value
automatically. This means that during
mashing and boiling, it is convenient to
set the cooling set point above 212ºF
so that the heating set point can be set
anywhere below 212ºF.
For example, when CSP=67ºF, HSP=62ºF,
HSP can be set to any value between
-58 and 67.0. For CSP, it can be set to
any value between -58 and 248. If you
set it to 55.0, the HSP will be set to 55.0
automatically.
A small differential between heating (HDF)
and cooling (CDF) set points gives tighter
control, but a larger differential reduces
the frequency of cycling on and off and
therefore extends the life of the relay and
compressor.
Note 2. When the measured temperature
is higher than the AL set point, the high limit alarm will be on; when the measured
temperature is lower than AL, the low limit alarm will be on.
When the alarm is on, the display will be flashing between the measured value and the alarm
type. To mute the alarm when it is on, press the Down key momentarily. (If the measured value
moves out of the alarm zone and then returns into the alarm zone again, the alarm will sound
again. To disable the alarm, set AH=AL.)
The upper value that AL can be set to is the current value of AH. But AH can be set to any value
between -58–248ºF (-50–125ºC). When AH is set to a value lower than the current AL, the AL will
be adjusted to the AH value automatically. For example, when AH=95ºF, AL can be set to any
value between -58 and 95. For AH, it can be set to any value between -58 and 248. If you set it
to 25, the AL will be lowered to 25 automatically as AL cannot be above AH.
Note 3. The Cooling Antishort is the minimum delay time in minutes for turning the cooling
load back on. When the controller is used for cooling and the load is a compressor (such
as glycol chiller), it should not turn on the compressor when it is at highest pressure (e.g.,
just after it turned off); otherwise, it may shorten the life of the compressor. The Anti-Short
cycle delay function, therefore, can be used to prevent the rapid cycling of the compressor.
(Technical note: it does this by establishing the minimum time that NO contacts remain open—
after reaching cutout—before closing again. The delay overrides any Load Demand and does
not allow the NO contacts to close until the set time-delay value has elapsed. This allows time
Table B
Summary of Contents for BIAC
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