Eliwell EWPlus 902 User manual

Electronic controllers for refrigeration units
Controles electrónicos para unidades de refrigeración
Contrôleurs électroniques pour unités réfrigérantes
Controladores eletrônicos para unidades de refrigeração
EWP ///
Installation manual includes:
English, Spanish, French, and Portuguese

3
Electronic controllers for refrigeration units
STAND-BY (ESC)
Press and release
Returns to the previous menu level
Confirm 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
Configurable 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
Confirms commands
set
KEYS
EW
PL US
902/961
EW
PL US
971/974
ENGLISH

4
LEDs
Reduced SET / Economy
Flashing: reduced set active
Quick flashing: 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
(only EWPlus 971 and EWPlus 974)
Alarm LED
Permanently on: alarm on
Flashing: alarm acknowledged
Off: otherwise
HEAT mode LED
Permanently on: compressor in HEAT mode
Off: otherwise
(only EWPlus 902 and EW Plus 961)
NOT USED
(only EWPlus 902 and EWPlus 961)
Aux LED
Permanently on: Aux active*
*depending on model
(only EWPlus 971 and EWPlus 974)
°C LED
Permanently on: °C setting (dro = 0)
Off: otherwise
°F LED
Permanently on: °F setting (dro = 1)
Off: otherwise
NOTE:
If the instrument is set in the COOL mode, in order to
use it in the HEAT mode it is necessary to re-program
the instrument by using the properly programmed
Copycard.
The same procedure should be followed to pass from
the HEAT mode to the COOL mode.

5
ACCESSING AND USING THE MENUS
Resources are organized into 2 menus which are accessed as explained below:
• ‘Machine Status’ menu: press and release the set key.
• ‘Programming’ menu: press for at least 5 secs the set key.
Either do not press any keys for 15 seconds (time-out) or press the key once, to confirm the last value
displayed and return to the previous screen.
MACHINE STATUS MENU
Access the “Machine Status” menu by pressing and releasing the set 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 EWPlus 971 and EWPlus 974 only)
Setting the Set point: To display the Set point value press the set 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 set to confirm the modification.
set
set set
Displaying the probes: When the Pb1 or Pb2* label is displayed, press set and the associated probe value
will appear (* Pb2 is only present on models EWPlus 971 and EWPlus 974).
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 set to display
the Set point, but you cannot edit them. To disable the keypad lock, repeat the locking procedure.
set

6
PROGRAMMING MENU
To access the ‘Programming’ menu press for at least 5 secs the set key. If specified, the ‘PA1’ for the level
1 parameters and the ‘PA2’ for the level 2 parameters access PASSWORD will be requested (see Par.
‘PASSWORD’) At the access, the display will show the first parameter (“diF”). By pressing the and keys
you can scroll all parameters in the current level: 5 secs
Select the desired parameter using the and keys. Press set to see the current value of the selected
parameter. Press and to change the value and then press set to save it.
NOTE: It is strongly recommended that you switch the device off and on again each time the parameter
configuration is changed, in order to prevent malfunctioning of the configuration and/or ongoing timings.
PASSWORD
‘PA1’ Password: It allows access to the level 1 parameters. In the standard configuration the password is disabled
(value = 0). To enable it (value ≠ 0) enter the “Programming” menu by pressing the and keys, scroll the
parameters until “PS1” label is displayed, press the set key to display the current value, change it by using the
and keys and then press the set key to save it. If the password is already enabled, you will be required to enter
it to access the ‘Programming’ menu. To enter it:
set
setset
‘PA2’ Password: It allows access to the level 2 parameters. In the standard configuration the password is enabled
(valore ≠ 0). To change its value follow the steps like for ‘PA1’ and change the ‘PS2’ parameter value.
The visibility of the ‘PA2’ label will be:
1) If PA1 and PA2 ≠ 0: By pressing the set key for more than 5 seconds, “PA1” and “PA2” labels will be displayed
at the same level and it will be possible to access either the level 1 or the level 2 parameters.
2) Otherwise: The ‘PA2’ password is present between the level 1 parameters. If ‘PA2’ is enabled, you will be required
to enter it to access the level 2. To enter it follow the steps described for the ‘PA1’ password.
If the password is incorrect, the instruments display the PA1/PA2 label and you will have to repeat the entry
procedure.
set
set
set

7
ALARMS
Label Fault Cause Effects 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 “MAX/MIN TEMP. ALARMS “)
• Registration AH1 label in the AL folder
• No effect 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 “MAX/MIN TEMP. ALARMS”)
• Registration AL1 label in the AL folder
• No effect on regulation
• Wait until temperature value
read by probe1 to come back
obove LAL
EA External alarm • Digital input activated
(H11 = ±5)
• 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 = ±4)
(for a longer time than tdO)
• Registration Opd label in the AL folder
• Alarm icon permanently ON
• Regulator blocked
• Close the door
• Delay function defined 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

8
MANUAL DEFROST CYCLE ACTIVATION
To manually activate the defrost cycle, hold down the key for 5 seconds.
If the defrost conditions are not satisfied:
- the parameter OdO ≠ 0 (EWPlus 902/961/971/974)
- the evaporator probe Pb2 temperature is higher than the defrost end temperature (EWPlus 971/974)
the display will flash 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 flash.
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 EWPlus 971/974: 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 2-13/16” x 1-1/8” (71x29mm), insert the ins-
trument and fix 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.
74 mm
32 mm
29 mm
71 mm
70 mm
59 mm

9
USING THE COPY CARD
The Copy Card is an accessory connected to the TTL serial port used for quick programming of the device
parameters (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:
set
After the password ‘PA2’ has been putted in, press the and keys to scroll through to the required
function (e.g. UL). Press the set 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 first 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.
UPLOAD
DOWNLOAD

10
MAX/MIN TEMPERATURE ALARM
Relative Temperature
Value to Setpoint (Att=1)
Absolute Temperature
Value (Att=0)
Temp. ≤ Set + LAL *
Temp. ≥ Set + HAL **
Temp. ≥ Set + LAL + AFd or
≥ 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

11
CONDITIONS OF USE
Permitted use
For safety reasons the instrument must be installed and used according to the instruction provided and in
particular, 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
Classification: Control device (not safety) to integrate
Mounting: Panel mounting with 2-13/16” x 1-1/8” (71x29mm) drilling template
Control type: 1.B
Pollution rating: 2
Material class: IIIa
Overvoltage category class: II
Nominal impulsive voltage: 2500V
Temperature: Operating: –5 to +65°C (+23 to +149°F) - Storage: –30 to +85°C (–22 to +185°F)
Power Supply: 115Va or 230Va (+10% / -10%) 50/60 Hz
Consumption: 4VA max
Digital Output (relays): Please refer to the device label
Fire resistance class: D
Software class: A
NOTE: Check the power supply specified on the instrument label; for relay and power supply
capacities, contact Technical Service.

12
Input Characteristics
Display Range: NTC: –50°C to +110°C (–58°C to +230°F)
(on display with 3 digit + sign)
Accuracy: Better than 0.5% of full-scale + 1 digit
Resolution: 0.1°C (0.1°F up to 199.9 ; 1°F beyond)
Buzzer: YES (it depends on the model)
Analogue Input: EWPlus 902/961: 1 NTC input - EWPlus 971/974: 2 NTC inputs
Digital Input: 1 voltage-free digital input
Output Characteristics
Digital Output: Model Relay Type of load Power Supply 115VaPower Supply 230Va
EWPlus 902: OUT1 - N.O. Resistive 8A 8A
Motor 1/8 Hp 1/2 Hp
OUT1 - N.C. Resistive 6A 6A
EWPlus 961: Compressor Motor 16 FLA / 96 LRA 12 FLA / 72 LRA
EWPlus 971:
Compressor Motor 16 FLA / 96 LRA 12 FLA / 72 LRA
Defrost - N.O. Resistive 8A 8A
Motor 1/8 Hp 1/2 Hp
Defrost - N.C. Resistive 6A 6A
EWPlus 974:
Compressor Motor 16 FLA / 96 LRA 12 FLA / 72 LRA
Defrost - N.O. Resistive 8A 8A
Motor 1/8 Hp 1/2 Hp
Defrost - N.C. Resistive 6A 6A
Fan Resistive 3A 3A
Motor 1.4 FLA / 7.5 LRA 1.4 FLA / 7.5 LRA
Mechanical Characteristics
Housing: PC UL94 V-0 resin plastic casing, polycarbonate glass
Dimensions: Front 2-15/16” x 1-1/4” (74x32mm), depth 2-15/16” (59mm) (excluding terminals)
Terminals: Screw terminals for cable with a diameter of 13 AWG (2.5mm2)
Connectors: TTL for connection to Copy Card
Humidity: Operating / Storage: 10 to 90% RH (not condensing)

13
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
- application: air
- climate range A
- measurement class 1 in the range from -25°C to 15°C (-13°F to 59°F) (*)
(* 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: diF ≠ 0.
HSE 1&2 Higher SEt. Maximum possible setpoint value.
LSE 1&2 Lower SEt. Minimum possible setpoint value.
HC 2 The regulator will go to HOT operating mode (set to ‘H’) or COLD operating mode (set to ‘C’)
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.

14
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 (defined 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.

15
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 par. “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).

16
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
Configuration 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.

17
H22 (!) 2 (Only EWPlus 971) Configurability of digital output 2 (B).
0 = Disabled; 1 = Compressor; 2 = Defrost; 3 = Fan; 4 = Alarm; 5 = AUX; 6 = Standby.
H23 (!) 2 (Only EWPlus 974) Configurability of digital output 3 (C). Same as H22.
H25 (!) 2 (Option) Enable/Disable the buzzer. 0 = Disabled; 4 = Buzzer; 1-2-3-5-6 = Not used.
H32 (!) 2 DOWN button configurability.
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 firmware. 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 modified, 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
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 license;
• for ParamManager: PCInterface 2150/2250 with ParamManager license;
(°) To configure the instrument for this purpose, use parameters “dEA” and “FAA” in the “Programming” menu.
NOTE: The instrument can be connected to TelevisSystem but the RVD function is not available.

18
CONNECTIONS
EWPlus 902 TERMINALS
OUT1 regulator relay OUT1
N-L Power Supply (115Va or 230Va)
A TTL input
EWPlus 961 TERMINALS
Compressor relay
N-L Power Supply (115Va or 230Va)
A TTL input
EWPlus 961EWPlus 902
N
L
3 6 7 9 10
D.I.
Power Supply
4VA max
Pb1
4 5 11
(thermostat)
LOAD
OUT1
A
TTL
E
W
PLU
S
902
N
L
2 3 9 10
D.I.
Pb1
4 11
(A)
(thermostat)
A
TTL
E
W
PLU
S
961
Power Supply
4VA max

19
CONNECTIONS
EWPlus 971 TERMINALS
Compressor relay
Defrost relay
N-L Power Supply (115Va or 230Va)
A TTL input
EWPlus 974 TERMINALS
Compressor relay
Defrost relay
Fans relay
N-L Power Supply (115Va or 230Va)
A TTL input
EWPlus 974EWPlus 971
N
L
2 3 6 7 8 9 10
D.I.
Pb1
4 5 11
Pb2
(A) (B)
(evaporator)
(thermostat)
A
TTL
E
W
PLU
S
971
Power Supply
4VA max
1
N
L
2 3 6 7 8 9 10
(C)
D.I.
Pb1
4 5 11
Pb2
(A) (B)
(evaporator)
(thermostat)
A
TTL
E
W
PLU
S
974
Power Supply
4VA max

20
Parameters - Default setting
PAR EWPlus 902/961 EWPlus 971 EWPlus 974 M.U. Level
RANGE DEFAULT RANGE DEFAULT RANGE DEFAULT
SEt -50,0 ... 99,0 32,0 -50,0 ... 99,0 32,0 -50,0 ... 99,0 32,0 °C/°F
diF 0,1 ... 30,0 2,0 0,1 ... 30,0 2,0 0,1 ... 30,0 2,0 °C/°F 1&2
HSE LSE ... 230 99,0 LSE ... 230 99,0 LSE ... 230 99,0 °C/°F 1&2
LSE -55,0 ... HSE -50,0 -55,0 ... HSE -50,0 -55,0 ... HSE -50,0 °C/°F 1&2
HC H/C C flag 2
OSP -30,0 ... 30,0 0,0 -30,0 ... 30,0 0,0 -30,0 ... 30,0 0,0 °C/°F 2
dOd n/y n n/y n n/y n flag 2
dAd 0 ... 255 0 0 ... 255 0 0 ... 255 0 min 2
Ont 0 ... 250 0 0 ... 250 0 0 ... 250 0 min 2
OFt 0 ... 250 1 0 ... 250 1 0 ... 250 1 min 2
dOn 0 ... 250 0 0 ... 250 0 0 ... 250 0 secs 2
dOF 0 ... 250 0 0 ... 250 0 0 ... 250 0 min 2
dbi 0 ... 250 0 0 ... 250 0 0 ... 250 0 min 2
OdO 0 ... 250 0 0 ... 250 0 0 ... 250 0 min 2
dty 0/1/2 0 0/1/2 0 flag 1&2
dit 0 ... 250 6 0 ... 250 6 0 to 250 6 hours 1&2
dCt 0/1/2 1 0/1/2 1 0/1/2 1 num 2
dOH 0 ... 59 0 0 ... 59 0 0 ... 59 0 min 2
dEt 1 ... 250 30 1 ... 250 30 1 ... 250 30 min 1&2
dSt -50,0 ... 150 45,0 -50,0 ... 150 45,0 °C/°F 1&2
dPO n/y n n/y n n/y n flag 2
FPt 0/1 0 flag 2
FSt -50,0 ... 150 100,0 °C/°F 1&2
FAd 1,0 ... 50,0 2,0 °C/°F 2
Fdt 0 ... 250 0 min 1&2
dt 0 ... 250 0 0 ... 250 0 min 1&2
dFd n/y y flag 1&2
FCO n/y y flag 2
Fod n/y n flag 2
Att 0/1 1 0/1 1 0/1 1 flag 2
AFd 1,0 ... 50,0 2,0 1,0 ... 50,0 2,0 1,0 ... 50,0 2,0 °C/°F 2