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electricity current permitted. As the instrument is built-in equipment
with permanent connection inside housing, it is not equipped with

either switches or internal devices to protect against overload of
current: the installation will include an overload protection and a

two-phase circuit-breaker, placed as near as possible to the
instrument, and located in a position that can easily be reached by

the user and marked as instrument disconnecting device which
interrupts the power supply to the equipment. It is also

recommended that the supply of all the electrical circuits connected
to the instrument must be protect properly, using devices (ex.

fuses) proportionate to the circulating currents. It is strongly
recommended that cables with proper insulation, according to the

working voltages and temperatures, be used. Furthermore, the
input cable of the probe has to be kept separate from line voltage

wiring. If the input cable of the probe is screened, it has to be
connected to the ground with only one side. We recommend that a

check should be made that the parameters are those desired and
that the application functions correctly before connecting the

outputs to the actuators so as to avoid malfunctioning that may
cause irregularities in the plant that could cause damage to people,

things or animals.

3.4 - ELECTRICAL WIRING DIAGRAM

11 12

Pr3 Pr2 Pr1

Dig.

OUT3 OUT1 OUT2

INPUTS

W09Y

100...240

VAC

SUPPLY

INTERNAL

BUZZER

1/2HP 250VAC,1/3HP 125VAC

1HP 250VAC, 1/2HP 125VAC

1/8HP 250/125 VAC

OUT3: 4A-AC1 (2A-AC3) / 250 VAC;

OUT2: 8A-AC1 (3A-AC3) / 250 VAC;

OUT1: 14A-AC1 (6A-AC3) / 250 VAC;

C: 16A MAX

4 - FUNCTIONS

4.1 - ON / STAND-BY

FUNCTION

The instrument, once powered up, can assume 2 different
conditions:

- ON : means that the controller uses the control functions.
- STAND-BY : means that the controller does not use any control

function and the display is turned off except for the Stand-by led.
If there is no power, and then power returns, the system always
sets itself in the condition it was in before the black-out.
The ON/Stand-by function can be selected:
- Pressing the key U for at least 1 sec. if the parameter

"t.UF"

= 4.

-Pressing the key DOWN/AUX for at least 1 sec. if the parameter

"t.Fb"

= 4.

- using the digital input if the parameter

“i.Fi”

= 10

4.2 - MEASURING AND VISUALIZATION

Via the parameter

“i.SE”

it is possible to select the type of probes

that one wishes to use and which can be: thermistores PTC
KTY81-121 (

) or NTC 103AT-2 (

Via the parameter

“i.uP”,

it is possible to select the temperature

unit of measurement the desired measurement resolution (

=°C /

1° ;

=°C / 0.1° ;

= °F / 1°;

= °F / 0.1°).

The instrument allows the measuring to be calibrated, that can be
used for re-calibrating the instrument according to application
needs, through the parameters

“i.C1”

(for the input Pr1),

“i.C2”

(for the input Pr2) and

“i.C3”

(for the input Pr3).

The functions carried out by Pr2 and Pr3 probes is defined by the
parameters

“i.P2”

and

“i.P3”

This parameters can be configured for the following functions:

= EP

- Evaporator probe: used to managing the defrost and the

evaporator fans (see relative functions)

= Au

- Auxiliary probe

= dG

- Digital input (see Digital input functions)

If probe Pr2 and/or Pr3 is/are not used, set the relative parameter

“i.P2”

and/or

“i.P3”

= oF.

It is not possible to program the two parameters for the same func-
tion. (priority goes to i.P2)
Using the parameter

“i.Ft”,

it is possible to set the time constant

for the software filter for measuring the input values to be able to
reduce the sensitivity to measurement disturbances (increasing the

time).
Through the parameter

“i.dS”,

it is possible to fix the normal

visualisation on the display that can be the measurement of the

probe Pr1 (P1), the measurement of the probe Pr2 (P2), the
measurement of the probe Pr3 (P3), the active set point value (SP),

or it can have the numerical display switched off (oF).
Through the parameter

“i.CU”,

it is possible to program an measu-

re offset that will be applied to the temperature show on the display

(only if i.dS”= P1, P2, P3).
All the controls will always happen in operation of the measure

corrected only by the calibration parameters (“i.C1”, “i.C2”, “i.C3).
The normal visualisation on the display is established by par.

“i.dS”, but it is possible to visualise all the variables and the highest
and lowest Pr1 peak measurement values in rotation by quickly

pressing and releasing key U.
The display will alternately show the code that identifies the

variable and its value.
The variable are:

“Pr1”

- Pr1 temperature

“Pr2”

- Pr2 temperature ( on/oF state if is progr. as digital input )

“Pr3”

- Pr3 temperature ( on/oF state if is progr. as digital input )

“

Lt”

and the lowest Pr1 peak temperature

“Ht

” and the highest Pr1 peak temperature

When the instrument is switched off, peak values are always
re-set. However, it is also possible to reset these values if the

instrument is switched on by using the DOWN key hold for 3 sec.
during peak visualization.

The display will show “---” and peaks memory will be reset.
The exit of this visualisation mode occurs automatically 15 seconds

after the last pressing on the key U.
Please remember that visualisation of the Pr1 probe can be

changed by the defrosting display lock function, by using the
parameter

“d.dL”

(see defrost function).

4.3 - DIGITAL INPUT

The digital input present on the instrument, alternative to Pr2 or Pr3
probe, accepts free voltage contacts, the function carried out is
defined by the parameter

“i.Fi”

and the action can be delayed for

the time set in parameter

“i.ti”.

If digital input is used, set the input relative parameter “i.P2” or
“i.P3” = dG.

The parameter “i.Fi” can be configured for the following functions:

= 0

- No function

= 1

- Defrosting start command with contact normally open: on

closing the digital input 1 (and after the “i.ti” time) a defrosting cycle

is activated.