Regulation; Second Compressor Management; Normal Mode Logic; Step Logic - 2Cc=Haf - Emerson DIXELL XD70T Installing And Operating Instructions

CoM PAr Parity control for COM1
Ui b1F Button 1 enabled in stand-by
Ui SCS User interface timeout
Ui bS Sound Level
Ui PSU Password for level Pr2
inF dP1 Probe P1 value visualization
inF dP2 Probe P2 value visualization
inF dP3 Probe P3 value visualization
inF dP4 Probe P4 value visualization
Real regulation Set Point (SET + HES +
inF rSE
SETd)
inF FdY Firmware release date: day
inF FMn Firmware release date: month
inF FYr Firmware release date: year
inF rEL Firmware release
inF SUb Firmware sub release
inF Ptb Parameter map version

6. REGULATION

The regulation is based on the temperature measured
by the thermostat probe (P1) with a positive differential
compared to the set point: if the temperature increases
and reaches the set point plus differential, the
compressor will start. The compressor will stop when
the temperature reaches the set point value again. In
case of fault because of the thermostat probe, the start
and stop of the compressor are timed through
parameters CoF and Con.

7. SECOND COMPRESSOR MANAGEMENT

This regulation can be activated when oAx=CP1 and oAy=CP2 and is valid only for ONOFF compressor
type.

7.1 NORMAL MODE LOGIC

The controller is able to manage applications where a couple of ONOFF compressors are used. The
available logic allows:
-
To use a step logic (par. 2CC=HAF) for the second compressor activation
-
To use a parallel logic (par. 2CC=FUL) for second compressor activation
Some delays are implemented to guarantee the right time between two consecutives compressor activation
or between first and second compressor activation.
Rotation function (par. rCC) can be activated to equalize number of working hours of both compressors.
7.1.1 STEP LOGIC – 2CC=HAF
The par. 2CC = HAF enables step logic:
- The first compressor (based on the rotation sequence) will be activated when T > SET+HY1.
- The second compressor (based on the rotation sequence) will be activated when T > SET+HY+HY1.
Moreover, par. 2on sets a delay between the activation of the first and the second compressor.
The deactivation logic follows:
- The second compressor (according to the rotation sequence) is switched off when the temperature
drops below: T < SET+HY
- The first compressor (according to the rotation sequence) is switched off when the temperature
drops below: T < SET
- Every compressor stop will load the relative anti-short cycle timer (par. AC or AC1).
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