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ENG
easy/easy compact/easy split +030220791 - rel. 3.2 - 13.07.2010
A4=0 multifunction input disabled
The multifunction input is not activated and cannot be used as a digital
or analogue input.
A4=1 external alarm
contact open= alarm detected
contact closed= normal operation.
When A4=1 easy can be connected to an external contact for immediately
signalling alarms. The alarm signal can be delayed by setting parameter
A7.
The activation of the alarm brings about a message on the display ((see
par. “5.1 Table of alarms and signals” on page 31), activates the buzzer (if
featured), and stops the compressor due to external alarm (immediate
if A7=0), while the fan continues operating according to parameters F0,
F1, F2, F3, Fd.
If the external alarm is detected during a defrost or a continuous cycle,
the controller stops these (without completing dripping and post-
dripping for defrosts). When the alarm ceases, the unit resumes normal
operation, and then:
• the continuous cycle (cc) can be performed again;
• defrosts can be performed;
• the compressor will start after the time set for parameter c2 (minimum
compressor o time.
A4=2 Enable defrost
contact open= not enabled
contact closed= enabled.
When A4=2 easy can be connected to an external contact for enabling
the defrost; this will then be activated only if the contact is closed and
after the delay set for parameter d5.
If the contact is closed when a defrost in progress, the defrost is
immediately stopped and the unit resumes normal operation (without
performing the dripping or post-dripping phases). The
LED starts
ashing indicating that the defrost call is still pending, awaiting enabling
(closing of the contact), when the defrost restarts (the timer dP is set to
zero).
A4=3 Start defrost on closing
The defrost call is generated when the digital input switches from open
to closed.
When A4=3 easy can be connected to an external contact for starting
the defrost when the contact closes. Setting dI=0 (no interval between
two defrosts) and without any time bands enabled, closing the external
contact will immediately start the defrost.
This function is useful for running timed defrosts without the RTC on
board (used to set the defrost time bands). To do this, simply connect
a mechanical or electronic timer to the digital input and set A4=3 to
guarantee the defrost cycles.
A series of units can be connected to the same timer. In this case, to
prevent all the defrosts from starting at the same time, set parameter d5
to di erent times for each unit connected (see Fig. 4.k).
In models PJEZM* this is used to select the probe whose value is displayed
by the instrument:
contact open= probe 1
contact closed= probe 2.
1
2
3
d5 (3)
dP (3)
d5 (2)
dP (2)
dP (1)
unit 1
unit 2
unit 3
Fig. 4.k
Key:
1 defrost call;
2 open;
3 closed.
A4=4 Curtain switch and night-time operation
contact open= curtain raised, normal operation
contact closed= curtain lowered and night-time operation
When A4=4 easy can be connected to an external contact for managing
the opening and the closing of the curtain on the refrigerated cabinet
and activating night-time operation.
Important:
3. when the contact is closed the temperature set point becomes the
night-time setting and consequently the value of “st” is increased
(“direct” mode) or decreased (“reverse” mode) by the value of r4;
4. night-time operation does not necessarily mean at night, but rather
the time bands in which the value of the set point is modi ed. This
usually corresponds to the period in which the refrigerated cabinet is
not used (shop closed) and when the curtain is down.
Contact Operation Operating mode Set point
open normal direct / reverse St
closed night-time direct St + r4
reverse St - r4
Table 4.k
A4=5 Remote ON – OFF
contact open= controller o
contact closed= controller on.
When A4=5 easy can be connected to an external contact for switching
instrument on/o . ON–OFF from external contact has priority over the
keypad and the supervisor.
See par. “3.5 Functions available from the keypad” page 15 for further
details on the functions of the instrument when OFF.
A4=6 Direct operation of AUX output with H1=3
contact open= AUX output not active
contact closed= AUX output active
When A4=6 easy can be connected to an external contact for controlling
the auxiliary output (H1=3 auxiliary output linked to the digital input).
A4=7 Door switch with evaporator fans o
contact open= door open
contact closed= door closed
This is used to signal the door open alarm and stop the evaporator fan.
See paragraph 4.9 “Door open/closed management“.
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