Operating Manual - John Morris Scientific

Ultra-Low Refrigerated Circulators
Warning:
The working temperature range of the refrigerated circulator is determined during
configuration. If set to >Control seriel < and > eprog serial< and >eprog<
Start conditions:
The external variable lies within the range –1 % to –100 %.
Time limit:
A 1-stage cooling machine produces cooling capacity after 5 minutes, a 2-stage
cooling machine after 10 minutes.
The indicator light illuminates only after this delay.
This time delay after switch-off and switch-on of the cooling unit ensures protection
of the cooling compressor.
Temperature limit
The bath temperature must be within the configured range (working temperature
range) of the refrigerated circulator. If the temperature exceeds the maximum
temperature, the compressor remains switched-off if cooling is requested. If the
bath temperature falls below the configured temperature range, the compressor
switches on and cold is applied to the bath after the time delay indicated above.
Stop conditions:
If the external variable is above 95 % (heating capacity) for more than 5 minutes,
the cooling machine is switched off.
Refrigerated circulators are configured to the effect that the compressor can only
operate within a certain, limited temperature range. The compressor is switched off
if the temperature exceeds the configured maximum temperature.
Special conditions on FP88-HL
If cooling is requested, the FP88 cooling machine changes the variable to the effective
value within 100 seconds starting at 0 % (at –100 % this means –1 % per second).
Only after this time is elapsed, cooling capacity is produced and the indicator light
illuminates.
If the variable is changed to the heating range (between 1 % to 100 %) within these
100 seconds, then the time is set to 0 if cooling is requested again.
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