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dc: Delay before defrosting
When the defrosting condition has been detected, but before the real activation of the cycle, the unit stops the
compressor for a time-interval dc (selectable from 0 to 3 minutes). After the compressor stops, the 4-way valves will
rotate after a time-lapse of dc/2; such an interval allows pressures to be balanced before the defrosting cycle is activated.
With this procedure, the timing of the compressor protection is not respected; therefore the compressor stops and starts
immediately. If dc=0, such a procedure is not effected and the reverse-cycle valve is immediately rotated as usual.
dd: Delay after defrosting
When the defrosting cycle is over, the unit will stop the compressor for a time-interval dd (selectable from 0 to 3min.).
After the compressor stops, the 4-way valves will rotate after a time-lapse of dd/2; such an interval allows pressures to
be balanced and, in case, a dripping of the external exchanger. With this procedure the timing of the compressor
protection is not respected; therefore the compressor stops and starts immediately.
If dd=0, such a procedure is not effected and the reverse-cycle valve is immediately rotated as usual.
dE: End defrosting with 2 gas circuits and 1 air circuit
The parameter dE allows the selection of the end of defrosting in the machines with 2 refrigerating circuits
and 1 air circuit.
Value
Selection
0
when both the circuits have reached the end of defrosting
1
when one of the circuits has reached the end of the defrosting
Antifreeze (parameters "A")
A1: Antifreeze
It indicates the water temperature at the evaporator outlet below which the unit prompts an antifreeze alarm. In the event
of antifreeze alarm the compressor will be stopped but the pump remains ON. The reset is manual and takes place only
when the water temperature
activated according to B1 or B2 probes (with the variation of parameter A6), cause just a message in the display and is
automatically reset.
A2: Differential for antifreeze
It indicates the differential for the antifreeze alarm; the alarm condition can not be reset until the temperature
exceeds the "set point+differential" value (A1+A2).
A3: Time to bypass the antifreeze/low ambient temperature alarm at start-up in Winter operating mode
In the event of an antifreeze alarm condition, this parameter allows to turn on the unit for a specific time-interval (only in
Winter operating mode, since the unit heats water/air). Should the alarm persists after the A3 time has passed, the unit
will automatically turn OFF.
A4: Set point for the activation of antifreeze/ supporting heaters
Indicates the threshold below which the antifreeze heater will be activated (also when the unit is in stand-by).
With ON/OFF B2 and B4 inputs, the antifreeze alarm and the heaters will be activated through an open
contact.
In 2-compressor units or in units with 1 compressor with capacity-controlled routine, 2 steps have been devised for the
activation of support heaters, each with a width equal to one half of the differential (A5); with ON/OFF B1 and B2 inputs
(and with the variation of parameter A6), the low ambient temperature alarm and the support heaters will be activated
through an open contact.
RG66000889-REV.00
returns within the operating limits (that is when it exceeds the value A1+A2). this alarm,
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