Eliwell EW961 User manual

ENGLISH
EN
Electronic controllers for refrigeration units
EW961/971/974
set

STAND-BY (ESC)
Press and release
Returns to the previous menu level
Conrm parameter value
Press for at least 5 secs
Activates the Stand-by function
(when outside the menus)
UP
Press and release
Scrolls through menu items
Increases values
Press for at least 5 secs
Activates the Manual Defrost function
DOWN
Press and release
Scrolls through menu items
Decreases values
Press for at least 5 secs
Congurable function by user (par. H32)
SET (ENTER)
Press and release
Displays alarms (if active)
Opens the Machine Status menu
Press for at least 5 secs
Opens the Programming menu
Conrms commands
SET / Reduced SET LED
Flashing: reduced set active
Quick ashing: access to level 2 parameters
Off: otherwise
Compressor LED
Permanently on: compressor active
Flashing: delay, protection or
blocked start-up
Off: otherwise
Defrost LED
Permanently on: defrost active
Flashing: manual or D.I. activation
Off: otherwise
Fan LED
Permanently on: fans active
Off: otherwise
Alarm LED
Permanently on: alarm on
Flashing: alarm acknowledged
Off: otherwise
set
EN ENGLISH
KEYS AND LEDs

set
set
set set
set
set
set
set
set
set
set
ACCESSING AND USING THE MENUS
Resources are organised into 2 menus which are accessed as explained below:
• ‘Machine Status’ menu: press and release the key.
• ‘Programming’ menu: press for at least 5 secs the key.
Either do not press any keys for 15 seconds (time-out) or press the key once, to conrm the last value displayed
and return to the previous screen.
MACHINE STATUS MENU
Access the “Machine Status” menu by pressing and releasing the key. If no alarms are active, the “SEt” label
appears. By pressing the and keys you can scroll all folders in the “Machine Status” menu:
- AL: alarms folder (only visible if an alarm is active);
- SEt: Set point setting folder;
- Pb1: probe 1 folder;
- Pb2: probe 2 folder **;
(** models EW971 and EW974 only)
Setting the Set point: To display the Set point value press the key when the ‘SEt’ label is displayed.
The Set point value appears on the display. To change the Set point value, press the
and keys within 15 seconds. Press to conrm the modication.
Displaying the probes: When the Pb1 or Pb2* label is displayed, press and the associated probe value will
appear (* Pb2 is only present on models EW971 and EW974).
SET POINT EDIT LOCK
It is possible to disable the keypad on this device. The keypad can be locked by programming the ‘LOC’ parameter.
With the keypad locked you can still access the ‘Machine Status’ menu by pressing to display the Set point,
but you cannot edit them. To disable the keypad lock, repeat the locking procedure.

set
set
set
set
setset
set
set
set
set
set
set
PROGRAMMING MENU
To access the ‘Programming’ menu press for at least 5 secs the key. If specied, the ‘PA1’ access PASSWORD will
be requested (see ‘PASSWORD’ paragraph). At the access, the display will show the rst parameter (“diF”).
By pressing the and keys you can scroll all parameters in the Programming menu:
5 secs
Select the desired parameter using the and keys. Press to see the current value of the selected
parameter. Press and to change the value and then press to save it.
NOTE: It is strongly recommended that you switch the device off and on again each time the parameter conguration
is changed, in order to prevent malfunctioning of the conguration and/or ongoing timings.
PASSWORD
The password “PA1” allow access to the level 1 parameters (USEr) as the password “PA2” allow access to the level 2
parameters (Installer). The level 2 parameters group include also all the level 1 parameters.
Default setting has the password “PA1” disabled (value = 0) while the password “PA2” is enabled (value = 15).
To enabled the password “PA1” (value ≠ 0) and assign the required value, enter in the “Programming” menu, select the
parameter “PS1” with and keys, press the key, assign the required value and conrm it by pressing the
key again.
If the password “PA1” is already enable, at the access to the “Programming” menu, will be required to put in the
password “PA1” or “PA2” according to the parameters that you need to edit. To enter the password ‘PA1’ (or ‘PA2’):
5 secs
If the password is incorrect, the display will show the ‘PA1’ (or ‘PA2’) label and you will have to repeat the entry
procedure. It is possible to access to level 2 parameters also from level 1 parameters by selecting parameter ‘PA2’
(available at level 1) through and keys and then pressing the key.

ALARMS
Label Fault Cause Eects Remedy
E1 Probe1 faulty
(cold room)
• reading of out of range operating
values
• probe faulty / short-circuited / open
• Display label E1
• Alarm icon permanently ON
• Min/max alarm regulator disabled
• Compressor operation according to “Ont”
and “OFt” parameters.
• check probe type (NTC)
• check the probe wiring
• replace probe
E2 Probe2 faulty
(defrost)
• reading of out of range operating
values
• probe faulty / short-circuited / open
• Display label E2
• Alarm icon permanently ON
• The defrost cycle will end due to Time out
(Parameter “dEt”)
• check probe type (NTC)
• check the probe wiring
• replace probe
AH1
Probe1 HIGH
Temperature
alarm
• value read by Pb1 > HAL after time
of “tAO”.
(see “MIN/MAX ALARMS table)
• Registration AH1 label in the AL folder
• No eect on regulation
• Wait until temperature value read
by probe1 returns below HAL.
AL1
Probe1 LOW
Temperature
alarm
• value read by Pb1 < LAL after time
of “tAO”.
(see “MIN/MAX ALARMS table)
• Registration AL1 label in the AL folder
• No eect on regulation
• Wait until temperature value read
by probe1 to come back obove LAL
EA External alarm • Digital input activated
(H11 set as external alarm)
• Registration EA label in the AL folder
• Alarm icon permanently ON
• Regulation blocked if EAL = y
• check and remove the external
cause which generate alarm on D.I.
OPd Door Open alarm
• Digital input activated
(H11 set as door switch)
(for a longer time than tdO)
• Registration Opd label in the AL folder
• Alarm icon permanently ON
• Regulator blocked
• close the door
• delay function dened by OAO
Ad2 Defrosting
for time-out
• end of defrosting because of time
instead of because of reaching the
defrost end temperature detected by
the Pb2 probe.
• Registration Ad2 label in the AL folder
• Alarm icon permanently ON
• wait until the next defrost for
automatic return

74 mm
32 mm
29 mm
71 mm
70 mm
59 mm
MANUAL DEFROST CYCLE ACTIVATION
To manually activate the defrost cycle, hold down the key for 5 seconds.
If the defrost conditions are not satised:
- the parameter OdO ≠ 0 (EW961, EW971 and EW974)
- the evaporator probe Pb2 temperature is higher than the defrost end temperature (EW971 and EW974)
the display will ash 3 times, to indicate that the operation will not be carried out.
DIAGNOSTICS
Alarms are always indicated by the buzzer (if present) and the alarm icon .
To switch off the buzzer, press and release any key, the relative icon will continue to ash.
NOTES: If alarm exclusion times have been set (see ‘AL’ folder in the parameters table) the alarm will not be signalled.
A probe 1 (Pb1) malfunction alarm will appear directly on the display with the
indication E1.
Models EW971 and EW974: A probe 2 (Pb2) malfunction alarm will appear
directly on the display with the indication E2.
MECHANICAL ASSEMBLY
The instrument is designed for panel mounting. Make a hole of 29x71 mm, insert the instrument and x it using
the brackets provided. Do not mount the instrument in humid and/or dirty places; it is suitable for use in ordinary
polluted places. Ventilate the place in proximity to the instrument colling slits.

set
UPLOAD
DOWNLOAD
set
set
USING THE COPY CARD
The Copy Card is an accessory connected to the TTL serial port used for quick programming of the device para-
meters (upload and download a parameter map to one or more devices of the same type). Upload (label UL) and
copy card formatting (label Fr) operations should be performed as explained below:
After the password ‘PA2’ has been putted in, press the and keys to scroll through to the required function
(e.g. UL). Press the key to execute the upload. If the operation is successful, the display will show ‘y’, if not it
will show ‘n’.
Upload (UL) This function uploads the programming parameters from the device.
UPLOAD: device Copy Card
Format (Fr) This command is used to format the copy card, an operation which is necessary when using the
card for the rst time. Important: when the copy card has been programmed, the parameter ‘Fr’
will delete all data that have been entered. This operation cannot be cancelled.
Download from reset:
Connect the copy card when the device is switched off. When
the device is switched on, the download from the copy card will
begin automatically. At the end of the lamp test, the display will
show ‘dLy’ if the operation was successful and ‘dLn’ if not.
DOWNLOAD: Copy Card device
NOTES:
- after the parameters have been downloaded, the device uses the downloaded parameter map settings.

MAX AND MIN TEMPERATURE ALARM
Relative Temperature
Value to setpoint (Att=1)
Absolute Temperature
Value (Att=0)
Temp. ≤ Set + LAL (only with LAL<0*)
Temp. ≥ Set + HAL (only with HAL>0**)
Temp. ≥ Set + LAL + AFd o
≥ Set - ILALI + AFd (LAL < 0*)
Temp. ≤ Set + HAL - AFd (HAL > 0**)
Temp. ≤ LAL (LAL with sign)
Temp. ≥ HAL (HAL with sign)
Temp. ≥ LAL + AFd
Temp. ≤ HAL - AFd
Minimum temperature
alarm
Maximum temperature
alarm
Returning from
minimum temp. alarm
Returning from
maximum temp. alarm
* if LAL is negative, Set + LAL < Set
** if HAL is negative, Set + HAL < Set
Setpoint - LAL
AFd
Off
Setpoint + HAL
AFd
Setpoint - LAL + AFd Setpoint + HAL - AFd
Setpoint LAL
AFd
HAL
AFd
LAL + AFd HAL - AFd

ELECTRICAL WIRING
Attention! Never work on electrical connections when the machine is switched on.
The device is equipped with screw or removable terminals for connecting electric cables with a diameter of 2.5mm2
(one wire per terminal for power connections).
For the capacity of the terminals, see the label on the instrument.
Do not exceed the maximum current allowed; in case of higher loads, use an appropriate contactor.
Make sure the power supply voltage complies with the one required by the instrument.
Probes have no connection polarity and can be extended using a regular bipolar cable (note that the extension of
the probes affects the EMC electromagnetic compatibility of the instrument: pay extreme attention to wiring).
Probe cables, power supply cables and the TTL serial cables should be distant from power cables.
RESPONSIBILITY AND RESIDUAL RISKS
ELIWELL CONTROLS SRL shall not be liable for any damages deriving from:
- installation/use other than that prescribed and, in particular, that which does not comply with safety standards
anticipated by regulations and/or those given herein;
- use on boards which do not guarantee adequate protection against electric shock, water or dust under the
conditions of assembly applied;
- use on boards which allow access to dangerous parts without the use of tools;
- tampering with and/or alteration of the products;
- installation/use on boards that do not comply with the standards and regulations in force.
DISCLAIMER
This manual and its contents remain the sole property of ELIWELL CONTROLS SRL, and shall not be reproduced or
distributed without authorization by ELIWELL CONTROLS SRL.
Although great care has been exercised in the preparation of this document, ELIWELL CONTROLS SRL, its employees
or its vendors, cannot accept any liability whatsoever connected with its use.
The same applies to any person or company involved in preparing and editing this document.
ELIWELL CONTROLS SRL reserves the right to make any changes or improvements without prior notice.

CONDITIONS OF USE
Permitted use
For safety reasons the instrument must be installed and used according to the instruction provided and in parti-
cular, under normal conditions, parts bearing dangerous voltage levels must not be accessible. The device must be
adequately protected from water and dust as per the application and must also only be accessible via the use of
tools (with the exception of the frontlet).
The device is ideally suited for use on household appliances and/or similar refrigeration equipment and has been
tested with regard to the aspects concerning European reference standards on safety.
Unpermitted use
Any other use other than that permitted is de facto prohibited. It should be noted that the relay contacts provided
are of a practical type and therefore subject to fault. Any protection devices required by product standards or
dictated by common sense due to obvious safety reasons should be applied externally.
TECHNICAL DATA (EN 60730-2-9)
Use: control device (not safety) to integrate
Mounting: panel mounting with 71x29 mm (+0.2/-0.1 mm) drilling template
Control type: 1.B
Pollution rating: 2
Material class: IIIa
Overvoltage category class: II
Nominal impulsive voltage: 2500V
Temperature: Operating: –5 … +55 °C - Storage: –30 … +85 °C
Power Supply: 230Vac (+10% / -10%) 50/60 Hz
Consumption: 4,5W max
Digital Output (relays): please refer to the device label
Fire resistance class: D
Software class: A
NOTA: check the power supply specied on the instrument label; for relay, power supply capacities
and PTC probes, contact the Sales Ofce.

FURTHER INFORMATIONS
Input Characteristics
Display Range: NTC: –50.0°C ... +110°C; PTC: –55.0°C ... +140°C
(on display with 3 digit + sign)
Accuracy: Better than 0,5% of full-scale + 1 digit
Resolution: 0,1 °C
Buzzer: YES (it depends from model)
Analogue Input: EW961: 1 NTC input
EW971: 2 NTC inputs
EW974: 2 NTC inputs
Digital Input: 1 voltage-free digital input
Output Characteristics
Digital Output: EW961: 1 Compressor relay: UL60730 (A) 1,5 Hp (10FLA - 60LRA) max 250Vac or
UL60730 (A) 2 Hp (12FLA - 72LRA) max 250Vac or
UL60730 (A) 12A max 250Vac
EW971: 1 Defrost relay: N.O. 8(4)A - N.C. 6(3)A max 250Vac
1 Compressor relay: UL60730 (A) 1,5 Hp (10FLA - 60LRA) max 250Vac or
UL60730 (A) 2 Hp (12FLA - 72LRA) max 250Vac or
UL60730 (A) 12A max 250Vac
EW971: 1 Defrost relay: N.O. 8(4)A - N.C. 6(3)A max 250Vac
1 Compressor relay: UL60730 (A) 1,5 Hp (10FLA - 60LRA) max 250Vac or
UL60730 (A) 2 Hp (12FLA - 72LRA) max 250Vac or
UL60730 (A) 12A max 250Vac
1 Fan relay: 5(2)A max 250Vac

Mechanical Characteristics
Housing: PC+ABS UL94 V-0 resin plastic casing, polycarbonate glass, thermoplastic resin
keysDimensions: front 74x32 mm, depth 59 mm (excluding terminals)
Terminals: screw/removable terminals for cable with a diameter of 2,5mm2
Connectors: TTL for connection to Copy Card
Humidity: Operating / Storage: 10…90 % RH (not condensing)
Regulations
Electromagnetic compatibility: This device complies with Directive 2004/108/EC
Security: This device complies with Directive 2006/95/EC
Food safety: This device complies with standard EN 13485 as follows:
- suitable for storage
- cliamate range A
- measurement class 1 in the range from -35°C to 25°C (*)
(* exclusively using Eliwell NTC probes)
NOTE: The technical data included in this document, related to measurement (range, accuracy, resolution, etc.)
refer to the instrument itself, and not to its equipment such as, for example, sensors. This means, for example, that
sensor(s) error(s) shall be added to the instrument’s one.

TABLE OF PARAMETERS
PAR.Liv. DESCRIPTION
SEt Temperature SEtpoint.
COMPRESSOR
diF 1&2 diFferential. Relay compressor tripping differential. The compressor stops on reaching the
Setpoint value (as indicated by the adjustment probe), and restarts at temperature value equal
to the Setpoint plus the value of the differential. Note: the value 0 cannot be assumed
HSE 1&2 Higher SEt. Maximum possible setpoint value.
LSE 1&2 Lower SEt. Minimum possible setpoint value.
OSP 2 Offset Set Point. Temperature Value to be added to the Set-Point if reduced set is enabled
(Economy function).
dOd 2 digital (input) Open door. Digital input that allow you to switch off loads.
Valid if H11 = ±4 (door switch). n = does not switch off loads; y = switch off loads.
dAd 2 digital (input) Activation delay. Delay time in activating the digital input.
Ont 2 ON time (compressor). Compressor activation time in the event of faulty probe. If OFt=1 and
Ont=0, the compressor is always off, while if OFt=1 and Ont>0 it operated in duty cycle mode.
OFt 2 OFF time (compressor). Compressor deactivation time if probe is faulty. If Ont=1 and
OFt=0, the compressor is always on, while if Ont=1 and OFt>0 it operated in duty cycle mode.
dOn 2 delay (at) On compressor. Delay time in activating the compressor relay after switch-on of
instrument.
dOF 2 delay (after power) OFF. Delay after switch off; the indicated time must elapse between switch-
off of the compressor relay and the successive switch-on.
dbi 2 delay between power-on. Delay between switch-ons; the indicated time must elapse between
two successive switch-ons of the compressor.
OdO (!) 2 delay Output (from power) On. Delay time in activating the outputs after switch-on of the
instrument or after a power failure.

DEFROST
dty 1&2 defrost type. Type of defrosting.
0 = electric defrost - compressor off (OFF) during defrosting;
1 = reverse cycle defrost (hot gas); compressor on (ON) during defrosting;
2 = Free defrost; defrosting independently of compressor.
dit 1&2 defrost interval time. Interval between the start of two successive defrosting operations.
dCt 2 defrost Counting type. Selection of count mode for the defrosting interval.
0 = compressor operating hours (DIGIFROST® method);
Defrosting active only if compressor is on;
1 = Real Time - equipment operating hours; defrost counting is always active when the
machine is on and start everytime the instrument switch on;
2 = compressor stop. Each time the compressor stops a defrosting cycle is performed
according to parameter dtY.
dOH 2 defrost Offset Hour. Start-of-defrosting delay time from the call.
dEt 1&2 defrost Endurance time. Defrosting time-out; determines duration of defrosting.
dSt 1&2 defrost Stop temperature. Defrost stop temperature (dened by the evaporator probe).
dPO 2 defrost (at) Power On. Determines if at the start-up the instrument must enter defrosting (if
the temperature measured by the evaporator allows this operation). y = yes; n = no.
EVAPORATOR FAN
FPt 2 Fan Parameter type. Characterizes the ‘FSt’ parameter that can be expressed or as an absolute
temperature value or as a value related to Setpoint. 0 = absolute 1 = relative.
FSt 1&2 Fan Stop temperature. Fan lock temperature; if the value, read by the evaporator probe, is
higher than the set value, fans stop.
FAd 2 FAn differential. Fan starting differential (see par. ‘FSt’).
Fdt 1&2 Fan delay time. Delay time in activating fans after a defrost operation.
dt 1&2 drainage time. Dripping time.
dFd 1&2 defrost Fan disable. Allows to select the evaporator probes exclusion during defrost.
y = yes (fan disable); n = no.
FCO 2
Fan Compressor OFF. Allows to select compressor fans lock OFF (switched off).
y = fans activated (with thermostat; based on the value read by the defrost probe, see
parameter “FSt”); n = fans off; dc = not used.

Fod 2
Fan open door. Fans active when the door is open.
Allows you to select the option of stopping the fans when the door is open, and re-starting
the fans when door is closed (if they were active). n = fans stop; y = fans unchanged.
ALARMS
Att 2 Allow you to select if the parameters HAL and LAL will have absolute (Att=0) or relative (Att=1)
value.
AFd 2 Alarm Fan differential. Alarm differential.
HAL 1&2 Higher ALarm. Maximum temperature alarm. Temperature value (in relative value) which if
exceeded in an upward direction triggers the activation of the alarm signal.
LAL 1&2 Lower ALarm. Minimum temperature alarm. Temperature value (in relative value), which if
exceeded in a downward direction, triggers the activation of the alarm signal.
PAO 2 Power-on Alarm Override. Alarm exclusion time after instrument switch on, after a power
failure.
dAO 2 defrost Alarm Override. Temperature alarm exclusion time after defrost.
OAO 2 Alarm signaling delay after digital input disabling (door close). Alarm is only for high-low
temperature alarms.
tdO 2 time out door Open. Alarm activation delay time open door.
tAO 1&2 temperature Alarm Override. Temperature alarm signal delay time.
dAt 2 defrost Alarm time. Alarm for defrosting ended due to time out.
n = alarm deactivated; y = alarm activated.
EAL 2 External Alarm Clock. External alarm to lock loads (n = don’t lock loads; y = lock loads).
COMMUNICATION
dEA 2 Device address in family (valid values from 0 to 14).
FAA 2
Device family (valid values from 0 to 14). The FAA and dEA values represent the network
address of the equipment and are indicated in the following format “FF.DD” (where FF=FAA
and DD=dEA).
DISPLAY
LOC 1&2
LOCk. Setpoint change shutdown. See related paragraph. There is still the possibility to enter
into parameters programming and modify these, including the status of this parameter to
permit keyboard shutdown. n = no; y = yes.

PS1 1&2 PAssword 1. When enabled (value ≠ 0) it constitutes the access key for level 1 parameters.
PS2 2 PAssword 2. When enabled (value ≠ 0) it constitutes the access key for level 2 parameters.
ndt 2 number display type. View with decimal point. y = yes; n = no.
CA1 1&2 CAlibration 1. Positive or negative temperature value added to the value read by probe 1.
CA2 1&2 CAlibration 2. Positive or negative temperature value added to the value read by probe 2.
ddL 1&2 defrost display Lock. Viewing mode during defrosting.
0 = shows the temperature read by the room probe;
1 = locks the reading on the temperature value read by room probe when defrosting
starts, and until the next time the Setpoint value is reached;
2 = displays the label “dEF” during defrosting, and until the next time the Setpoint value
is reached.
dro 2 display read-out. Select °C or °F for displaying the temperature read by the thermostat probe.
(0 = °C, 1 = °F).
PLEASE NOTE: the switch between °C and °F DO NOT modify setpoint, differential, etc.
(for example set=10°C become 10°F)
ddd 2 Selection of type of value to be displayed.
0 = Setpoint; 1 = cold room probe (Pb1); 2 = evaporator probe (Pb2).
CONFIGURATION
H08 2 Stand-by operating mode. 0 = display switch off;
1 = display switch off, loads and alarms stopped;
2 = display with OFF label, loads and alarms stopped.
H11 2 Conguration of digital inputs/polarity. 0 = disabled; ±1 = defrosting; ±2 = reduced set;
±3 = not used; ±4 = door switch; ±5 = external alarm; ±6 = Stand-by (ON-OFF).
ATTENTION!: the “+” sign indicates that the input is activated when the contact is closed.
the “-” sign indicates that the input is activated when the contact is open.
H25 (!) 2 Enable/Disable the buzzer. 0 = disabled; 4 = enabled; 1-2-3-5-6 = not used.
H32 2 DOWN button congurability.
0 = disabled; 1 = defrost; 2 = not used; 3 = reduced set; 4 = stand-by.
H42 1&2 Evaporator probe present. n = not present; y = present.
reL 1&2 reLease rmware. Device version: read only parameter.
tAb 1&2 tAble of parameters. Reserved: read only parameter.

COPY CARD
UL 2 Up load. Programming parameter transfer from instrument to Copy Card.
Fr 2 Format. Erasing all data in the copy card.
(!) WARNING!
• If one or more of these parameters highlighted with (!) are modied, the controller must be switched off and
switched on again to ensure correct operation.
• Parameter H25 is present only in model with buzzer on board.
SUPERVISION
The device can be connected to:
• telecontrol system TelevisSystem (°)
• ParamManager fast parameter setting software
• DeviceManager fast parameter setting software (only parameter table)
The connection can be made via TTL serial port.
For connection to RS-485 bus use TTL/RS485 interface BusAdapter 150.
For connection to PC should be used:
• for TelevisSystem: PCInterface 1110/1120 with Televis licence;
• for ParamManager: PCInterface 2150/2250 with ParamManager licence;
(°) To congure the instrument for this purpose, use parameters “dEA” and “FAA” in the “Programming” menu.

EW961: CONNECTIONS/ CONNESSIONI/ CONNEXIONS/ ПОДКЛЮЧЕНИЯ
TERMINALS/ MORSETTI/ BORNES/ РАЗЪЕМЫ
compressor relay / relè compressore / relais compresseur / реле компрессора
N-L Power Supply / Alimentazione / Alimentation / Источник питания
A TTL input / Ingresso TTL / Entrée TTL / TTL порт
EW961
A
N
L
TTL
910
D.I.
Supply
4.5W max
Pb1
(A)
(thermostat)
2 3 411

TERMINALS/ MORSETTI/ BORNES/ РАЗЪЕМЫ
defrost relay / relè sbrinamento / relais dégivrage / реле размораживания
compressor relay / relè compressore / relais compresseur / реле компрессора
N-L Power Supply / Alimentazione / Alimentation / Источник питания
A TTL input / Ingresso TTL / Entrée TTL / TTL порт
EW971: CONNECTIONS/ CONNESSIONI/ CONNEXIONS/ ПОДКЛЮЧЕНИЕ
EW971
A
N
L
TTL
10
D.I.
Supply
4.5W max
Pb1
11
Pb2
(A)( B)
(evaporator)
(thermostat)
9
2 3 48
7
6
5

EW974: CONNECTIONS/ CONNESSIONI/ CONNEXIONS/ ПОДКЛЮЧЕНИЕ
TERMINALS/ MORSETTI/ BORNES/ РАЗЪЕМЫ
defrost relay / relè sbrinamento / relais dégivrage / реле размораживания
compressor relay / relè compressore / relais compresseur / реле компрессора
fan relay / relè ventole / relais ventilateurs / реле крыльчаток
N-L Power Supply / Alimentazione / Alimentation / Источник питания
A TTL input / Ingresso TTL / Entrée TTL / TTL порт
1
EW974
A
N
L
TTL
10
(C)
D.I.
Supply
4.5W max
Pb1
11
Pb2
(A)( B)
(evaporator)
(thermostat)
9
2 3 48
7
6
5