Evco EC 3-181 User manual

EC 3-181
ON-OFF digital thermostat for compressor,
evaporator fans and defrost (for temperature-
time) management
Operating instructions
Release 1/98 of November the eighteenth 1998
Code EC 3-181 DOC E000
File 3181e.p65
IMPORTANT:
The use of this new instrument is easy; but for safety reasons, it is
important read these instructions carefully before the installation or
before the use and follow all additional informations.
It is very important keep these instructions with the instrument for future
consultations.
ENGLISH
GENERAL INFORMATIONS
WHAT IS THE USE
EC 3-181 is an ON-OFF digital thermostat studied for refrigerating systems management through
the compressor, evaporator fans and defrost (for temperature-time) management.
In factory the instrument gets preset to accept at the measure inputs PTC/NTC probes used in
refrigeration field at the moment.
Some parameters permit to set the thermostat to protect the compressor against overloads
due to several starts repeated in a short time, to manage the defrost according with ones
requirements, to establish the evaporator fans output functioning, to signal working condi-
tions outside the safety limits.
EC 3-181 is available in the 74 x 32 mm (2.91 x 1.25 in.) case and it is studied for panel
mounting with the equipped screw or spring brackets.
GETTING STARTED
INSTALLATION
EC 3-181 was studied for panel mounting, panel cutout 71 x 29 mm (2.79 x 1.14 in.), with the
equipped screw or spring brackets (the overall dimensions and the panel cutout are related in
Fig. 3, the fixing systems suggested by the builder are related respectively in Fig. 4 and in
Fig. 5).
ADDITIONAL INFORMATIONS
- the panel thickness must be included from 1 to 5 mm (0.04 to 0.19 in.)
- verify if the using conditions (ambient temperature, humidity, etc.) are within the
limits indicated by the builder (see the chapter TECHNICAL DATA)
- install the instrument in a location with a suitable ventilation, to avoid the inter-
nal overheating of the instrument
- do not install the instrument near surfaces that can to obstruct the air-grating
(carpets, covers, etc.), heating sources (radiators, hot air ducts, etc.), locations
subject to direct sunlight, rain, humidity, excessive dust, mechanical vibrations
or bumps, devices with strong magnetos (microwave ovens, big speakers, etc.)
- according with the safety norms, the protection against possible contacts with
electrical parts and parts protected with functional insulation only must be ensured
through a correct installation procedure of the instrument; all parts that ensure
the protection must be fixed so that they can not be removed if not with a tool
- if not differently specified at the time of order, the instrument will be equipped
with screw brackets.
ELECTRICAL CONNECTION
EC 3-181 is provided with two screw terminal blocks for cables up to 2.5 mm² (0.38 in.², for the
connection to the power supply, inputs and outputs) and it is provided with one five poles
single line male connector (for the connection to the CLONE configurer/cloner and RICS super-
vision systems), located on the instrument back panel (the connections to derive are related in
Fig. 6 and they are checkable on the polyester label stuck on the instrument case).
ADDITIONAL INFORMATIONS
- if the instrument is brought from a cold to a warm location, the humidity may
condense inside the instrument; wait about an hour before supply the instrument
- verify if the operating power supply voltage, electrical frequency and power of
the instrument correspond to the local power supply (see the chapter TECHNICAL
DATA)
- do not supply more instruments with the same transformer
- if the instrument is installed on a vehicle, its power supply must be derived di-
rectly from the battery of the vehicle
- give the instrument a protection able to limit the current absorbed in case of
failure
- the instrument remains connected to the local power supply as long as the termi-
nals 7 and 8 are derived to the local power supply, even if the instrument is appar-
ently turned off
- give the probes a protection able to insulate them against possible contacts with
metal parts or use insulated probes
Fig. 1
f3-181.wmf
- give the outputs a protection able to protect them against short circuit and over-
load
- do not try to repair the instrument; for the repairs apply to highly qualified staff
- if you have any questions or problems concerning the instrument please consult
Every Control (see the chapter BUILDER DATA).
USE
PRELIMINARY INFORMATIONS
After derived the connections related in Fig. 6, during the normal functioning the instrument
displays the temperature read by the cabinet probe.
Fig. 2
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If an alarm should be active the instrument displays the alarm code flashing and the buzzer
utters an intermittent beep as long as the cause that has given it does not disappear (see the
chapter SIGNALS AND ALARMS); pressure on the key T1 during an alarm permits to silence
the buzzer.
EC 3-181 is provided with one working setpoint and with some configuration parameters that
get stored in a non volatile memory and that permit to set the instrument according with ones
requirements (see the chapter CONFIGURABILITY).
The output K 1 is associated to the compressor and to the working setpoint, it remains acti-
vated continuously as long as the temperature read by the cabinet probe reaches the working
setpoint and when it rises above the working setpoint of the hysteresis value (differential) the
output gets reactivated, except during a defrost and a dripping.
The output K 2 is associated to the evaporator fans and it is forced to the status ON, except
during a dripping and except what established with the parameters of the family F.
Passed the defrost interval from the moment of the instrument start or from the moment in
which the instrument presents a request of a defrost cycle, if the conditions permit it (the
temperature read by the evaporator probe must be below the defrost stopping setpoint) the
instrument automatically presents the following request of a defrost cycle.
A defrost cycle provides three phases (defrost, dripping and evaporator fans stoppage) con-
nected in cascade since the end of one automatically determines the passage to the following
one.
The output K 3 is associated to the defrost and it remains continuously activated during the
defrost as long as the temperature read by the evaporator probe reaches the defrost stopping
setpoint when the defrost ends and the instrument automatically moves to the dripping; if the
instrument was set to manage defrost to resistances (electrical) during a defrost the output K 1
gets forced to the status OFF, if the instrument was set to manage hot gas defrost (reversal of
cycle) during a defrost the output K 1 remains continuously activated.
Passed the dripping length from the moment of the defrost end the instrument automatically
moves to the evaporator fans stoppage; during a dripping the outputs K 1 and K 2 get forced to
the status OFF.
Passed the evaporator fans stoppage length from the moment of the dripping end the defrost
cycle ends; during an evaporator fans stoppage the output K 2 activation gets disabled.
If the conditions permit it (the temperature read by the evaporator probe must be below the
defrost stopping setpoint) keeping pushed the key T2 for four seconds at least or activating the
remote defrost digital input the instrument presents a request of a defrost cycle.
WORKING SETPOINT SETTING (WORKING TEMPERATURE)
To modify the working setpoint value keep pushed the key T3 (the instrument displays the
actual value) and at the same time push and release over and over the key T1 or T2 as long as
the instrument displays the desired value (keeping pushed the key T1 or T2 the value gets
decreased or increased more quickly): after the modification release the key T3 last; during the
pressure of the key T3 the LED L1 flashes quickly to indicate that a working setpoint setting
DIMENSIONAL DATA
OVERALL DIMENSIONS AND PANEL CUTOUT
The dimensions are expressed in millimetres and inches (third-scale drawing).
Fig. 3
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INSTALLATION
WITH THE FIXING SYSTEMS SUGGESTED BY THE BUILDER
Panel mounting, with the equipped screw (Fig. 4) or spring brackets (Fig. 5) (third-scale drawing).
Fig. 4
ms3vv.wmf
Fig. 5
ms3vm.wmf
ELECTRICAL CONNECTION
CONNECTIONS TO DERIVE
Instance of typical application.
BUILDER DATA
EVERY CONTROL S.r.l.
Via Mezzaterra 6, 32036 Sedico Belluno ITALY
Phone [phone] (a.r.) Fax [phone]
Internet addresses
e-mail: [email protected]
http://www.everycontrol.it
TO BE CAREFUL
This publication exclusively belongs to EVERY CONTROL and shall not be reproduced and distributed if not expressly authorized by the same EVERY CONTROL.
EVERY CONTROL does not assume any responsibility in order to the characteristics, to the technical data and to the possible mistakes related herein or deriving from the use of the same.
EVERY CONTROL can not be considered responsible for damages caused from the inobservance of the additional informations.
EVERY CONTROL reserves the right to make any modification without prior notice and at any time without prejudice the basic functioning and safety characteristics.
Fig. 6
c3-181e.wmf
14

procedure is running (to the release of the key T3 the instrument automatically turns out from
the working setpoint setting procedure).
ADDITIONAL INFORMATIONS
- for the whole period of a corrupted memory data alarm the access to the working
setpoint setting procedure is refused
- the working setpoint is programmable within the limits established with the pa-
rameters r1 and r2
- the working setpoint value gets stored in a non volatile memory even if a lack of
power supply happens.
CONFIGURATION PARAMETERS SETTING
Configuration parameters are arranged on two levels, to protect the most tricky settings against
undesirable violations and they are arranged in families that can be recognized through the
initial letter of the label.
To gain access to the first level keep pushed at the same time for four seconds at least the keys
T1 and T2 (passed four seconds the instrument displays the label PA).
To select a parameter of the first level push and release over and over the key T1 or T2 as long
as the instrument displays the label of the desired parameter.
To modify the parameter value keep pushed the key T3 (the instrument displays the actual
value) and at the same time push and release over and over the key T1 or T2 as long as the
instrument displays the desired value (keeping pushed the key T1 or T2 the value gets de-
creased or increased more quickly); after the modification release the key T3 last (to the
release of the key T3 the instrument displays the label of the parameter again).
To gain access to the second level enter inside the first level and select the label PA.
Keep pushed the key T3 (the instrument displays the actual value) and at the same time push
and release over and over the key T1 or T2 as long as the instrument displays -19 (keeping
pushed the key T1 or T2 the value gets decreased or increased more quickly): after the modi-
fication release the key T3 last (to the release of the key T3 the instrument displays the label PA
again); keep pushed at the same time for four seconds at least the keys T1 and T2 (passed four
seconds the instrument displays the first parameter of the second level).
To select a parameter of the second level push and release over and over the key T1 or T2 as
long as the instrument displays the label of the desired parameter.
To modify the parameter value keep pushed the key T3 (the instrument displays the actual
value) and at the same time push and release over and over the key T1 or T2 as long as the
instrument displays the desired value (keeping pushed the key T1 or T2 the value gets de-
creased or increased more quickly); after the modification release the key T3 last (to the
release of the key T3 the instrument displays the label of the parameter again).
To turn out from the configuration parameters setting procedure keep pushed at the same time
for four seconds at least the keys T1 and T2 or do not operate with the keys for fifty seconds at
least (time-out exit).
ADDITIONAL INFORMATIONS
- for the whole period of a corrupted memory data alarm the access to the configu-
ration parameters setting procedure is refused
- the modification of a parameter value which unit of measure is the hour or the
minute or the second has not immediate effect; to obtain this effect it must not be
executed during the course of the value
- the configuration parameters values get stored in a non volatile memory even if a
lack of power supply happens.
CONFIGURABILITY
WORKING SETPOINT
LABELMIN. MAX. U.M. ST. WORKING SETPOINT
r1 r2 °C +2 working setpoint
It establishes the temperature associated to the output K 1.
CONFIGURATION PARAMETERS
LABELMIN. MAX. U.M. ST. PASSWORD
PA -55 99 --- 0 password (§)
It is the password that permits to gain access to the second level.
LABELMIN. MAX. U.M. ST. MEASURE INPUTS
/0 1 4 --- 1 kind of probe
It establishes the kind of probe that the instrument must recognize to its measure inputs, as
indicated:
1 = PTC probe 2 = reserved
3 = NTC probe 4 = reserved.
/1 -55 +99 °C/8 0 calibration
It establishes a threshold to add algebraically to the signals coming from the measure inputs
(for instance to correct the signals).
/2 0 6 --- 3 digital filter
It establishes a time constant to apply to the signals coming from the measure inputs, as indi-
cated:
0 = 0 sec. 1 = 0.4 sec.
2 = 1.2 sec. 3 = 3.0 sec.
4 = 8.0 sec. 5 = 19.8 sec.
6 = 48.0 sec.
/3 --- --- --- --- reserved
Reserved.
LABELMIN. MAX. U.M. ST. ON-OFF TEMPERATURE REGULATOR ASSOCIATED TO
THE WORKING SETPOINT AND TO THE OUTPUT K 1
r0 +1 +15 °C +2 hysteresis (differential) (§)
It establishes the hysteresis (differential) relative to the working setpoint.
r1 -55 +99 °C -50 minimum working setpoint programmable
It establishes the minimum working setpoint programmable; the instrument automatically veri-
fies if the value established with the parameter r1 is below the maximum working setpoint
programmable established with the parameter r2.
r2 -55 +99 °C +50 maximum working setpoint programmable
It establishes the maximum working setpoint programmable; the instrument automatically veri-
fies if the value established with the parameter r2 is above the minimum working setpoint
programmable established with the parameter r1.
LABELMIN. MAX. U.M. ST. OUTPUT K 1 PROTECTION
C0 0 15 min. 0 disabling time to the output activation from the instru-
ment start
It establishes the time that disables the output activation from the moment of the instrument
start.
C1 0 15 min. 5 disabling time to the output activation from the previ-
ous activation
It establishes the time that disables the output activation from the moment of the previous
output activation.
C2 0 15 min. 3 disabling time to the output activation from the previ-
ous deactivation
It establishes the time that disables the output activation from the moment of the previous
output deactivation.
C3 0 1 --- 0 output status during a cabinet probe failure alarm
It establishes the status to which the output gets forced during a cabinet probe failure alarm, as
indicated:
0 = during a cabinet probe failure alarm the output gets forced to the status OFF
1 = during a cabinet probe failure alarm the output gets forced to the status ON.
C4 0 1 --- 0 disabling time to the output activation and deactivation
It establishes if to disable the output activation and deactivation for a fixed time, as indicated:
0 = inactive
1 = the output activation and deactivation get disabled for 3 sec.
LABELMIN. MAX. U.M. ST. DEFROST REGULATOR
d0 0 99 (*) 8 defrost interval
It establishes the time interval that pass from the moment of the instrument start or from the
moment in which the instrument presents a request of a defrost cycle to the moment in which
the instrument automatically presents the following request of a defrost cycle.
If the parameter d0 has value 0 the instrument never automatically presents a request of a
defrost cycle, except what established with the parameter d4.
d1 0 1 --- 0 kind of defrost
It establishes the kind of defrost that the instrument must manage, as indicated:
0 = to resistances (electrical)
1 = to hot gas (reversal of cycle).
d2 -55 +99 °C +2 defrost stopping setpoint
It establishes the temperature to which a defrost gets stopped and it is referred to the evapora-
tor probe.
d3 1 99 (*) 30 defrost maximum length
It establishes the defrost maximum length.
Passed the defrost maximum length from the moment in which the instrument activates a
defrost cycle, if the temperature read by the evaporator probe is below the setpoint established
with the parameter d2 the defrost ends.
d4 0 1 --- 0 defrost cycle at the instrument start
It establishes if the instrument automatically must present a request of a defrost cycle at the
moment of the instrument start, as indicated:
0 = inactive
1 = the instrument automatically presents a request of a defrost cycle at the moment of the
instrument start.
d5 0 99 (*) 0 delay to a defrost cycle activation from the instrument
start
If the parameter d4 has value 0 it establishes a time interval to add to the interval established
with the parameter d0; the value so obtained establishes the time interval that pass from the
moment of the instrument start to the moment in which the instrument automatically presents
the following request of a defrost cycle.
If the parameter d4 has value 1 it establishes the delay with which the instrument automatically
presents a request of a defrost cycle from the moment of the instrument start.
A manual presentation of a request of a defrost cycle during the count of the delay established
with the parameter d5 clears the delay.
d6 0 1 --- 1 locking of the displayed temperature from a defrost cy-
cle activation
It establishes if to lock the displayed temperature from the moment in which the instrument
activates a defrost cycle, as indicated:
0 = inactive
1 = during a defrost, a dripping and as long as the temperature read by the cabinet probe
reaches the working setpoint, the instrument displays the temperature read by the
cabinet probe in the moment in which the instrument activates a defrost cycle.
d7 0 15 (*) 2 dripping length
It establishes the dripping length.
d8 0 15 hours 1 disabling time to the temperature alarm activation from
the defrost cycle end
It is significant exclusively if the parameter db has value 0, it establishes the time that disables
the temperature alarm activation from the moment of the defrost cycle end.
d9 0 1 --- 0 disabling times to the output K 1 activation override
It is significant exclusively if the parameter d1 has value 1, it establishes if to clear the disa-
bling times to the output K 1 activation in the moment in which the instrument presents a
request of a defrost cycle, as indicated:
0 = inactive
1 = in the moment in which the instrument presents a request of a defrost cycle the
disabling times to the output K 1 activation get cleared.
dA --- --- °C --- evaporator probe reading (§)
It permits to display the temperature read by the evaporator probe.
db 0 1 --- 0 times base for the parameters d0, d3, d5, d7 and F5
It establishes the unit of measure of the parameters d0, d3, d5, d7 and F5, as indicated:
0 = the unit of measure of the parameter d0 is the hour and the unit of measure of the
parameters d3, d5, d7 and F5 is the minute
1 = the unit of measure of the parameter d0 is the minute and the unit of measure of the
parameters d3, d5, d7 and F5 is the second.
LABELMIN. MAX. U.M. ST. TEMPERATURE ALARM REGULATOR
A0 +1 +15 °C +2 hysteresis (differential)
It establishes the hysteresis (differential) relative to the parameters A1 and A2.
A1 -55 0 °C -10 lower alarm set relative to the working setpoint
It establishes a threshold to add algebraically to the working setpoint; the value so obtained
establishes the temperature below which the lower temperature alarm gets activated and it is
referred to the cabinet probe.
If the parameter A1 has value 0 the lower temperature alarm never gets activated.
A2 0 +99 °C +10 upper alarm set relative to the working setpoint
It establishes a threshold to add algebraically to the working setpoint; the value so obtained
establishes the temperature above which the upper temperature alarm gets activated and it is
referred to the cabinet probe.
If the parameter A2 has value 0 the upper temperature alarm never gets activated.
A3 0 15 hours 2 disabling time to the alarm activation from the instru-
ment start
It establishes the time that disables the temperature alarm activation from the moment of the
instrument start.
A4 --- --- --- --- reserved
Reserved.
LABELMIN. MAX. U.M. ST. EVAPORATOR FANS REGULATOR ASSOCIATED TO THE
OUTPUT K 2
F0 0 1 --- 1 output functioning
It establishes the output functioning, as indicated:
0 = the output is associated to the setpoint established with the parameter F1, it remains
continuously activated as long as the temperature read by the evaporator probe reaches
the setpoint established with the parameter F1 and when it falls below the setpoint
established with the parameter F1 of the hysteresis value (differential) established with
the parameter F2 the output gets reactivated, except what established with the
parameters d7, F3, F4 and F5
1 = the output gets forced to the status ON, except what established with the parameters d7,
F3, F4 and F5.
F1 -55 +99 °C -1 output deactivation setpoint
It is significant exclusively if the parameter F0 has value 0, according with the modality estab-
lished with the parameter F6, it establishes the temperature to which the output gets deacti-
vated and it is referred to the evaporator probe.
F2 +2 +15 °C +2 hysteresis (differential)
It is significant exclusively if the parameter F0 has value 0, it establishes the hysteresis (differ-
ential) relative to the parameter F1.
F3 0 1 --- 1 output typology
It establishes a bond with the output K 1 status, as indicated:
0 = inactive
1 = during the status OFF of the output K 1 the output gets forced to the status OFF.
F4 0 1 --- 1 output forced to the status OFF during the defrost
It establishes if to force the output to the status OFF during a defrost, as indicated:
0 = inactive
1 = during a defrost the output gets forced to the status OFF.
F5 0 15 (*) 15 evaporator fans stoppage length
It establishes the evaporator fans stoppage length.
F6 0 1 --- 0 kind of output deactivation setpoint
It is significant exclusively if the parameter F0 has value 0, it establishes the kind of output
deactivation setpoint that the instrument must manage, as indicated:
0 = absolute (the output deactivation setpoint establishes the temperature to which the
output gets deactivated)
1 = relative to the temperature read by the cabinet probe (the value obtained subtracting
the absolute value of the output deactivation setpoint to the temperature read by the
cabinet probe establishes the temperature to which the output gets deactivated).
LABELMIN. MAX. U.M. ST. CONNECTION IN A SERIAL NETWORK WITH EVCOBUS
PROTOCOL COMMUNICATION
L0 --- --- --- --- reserved
Reserved.
L1 1 15 --- 1 instrument address
It establishes the address to which the instrument (slave) answers when it is connected to a
serial network with EVCOBUS protocol communication managed from a master (for instance a
Personal Computer).
ADDITIONAL INFORMATIONS
- the symbol (§) indicates that the parameter is of the first level
- the symbol (*) indicates that the unit of measure depends from the parameter db.
SIGNALS AND ALARMS
SIGNALS
If the LED L1 is turned ON it means that the output K 1 is activated.
If the LED L2 is turned ON it means that the output K 3 is activated.
If the LED L3 is turned ON it means that the output K 2 is activated.
If the LED L1 flashes it means that a count of a disabling time to the output K 1 activation is
running (see the parameters C0, C1, C2 and C4).
If the LED L2 flashes it means that a count of a delay time to a defrost cycle activation is
running (see the parameters C0, C1, C2 and C4) or that a dripping is running (see the param-
eter d7).
If the LED L3 flashes it means that an evaporator fans stoppage is running (see the parameter
F5).
ALARMS
If the instrument displays the indication E2 flashing and the buzzer utters an intermittent
beep (corrupted memory data alarm) it means that there is a corruption of the configuration
data in the memory (turn OFF and turn ON again the instrument: if to the turning ON again the
alarm does not disappear the instrument must be replaced); during this alarm the access to
the working setpoint setting and the configuration parameters setting procedures is refused
and all outputs get forced to the status OFF.
If the instrument displays the indication E0 flashing and the buzzer utters an intermittent
beep (cabinet probe failure alarm) it means that: the kind of connected cabinet probe is not
proper (see the parameter /0), the cabinet probe is faulty (verify the cabinet probe integrity),
there is a mistake in the instrument-cabinet probe connection (verify the instrument-cabinet
probe connection integrity), the temperature read by the cabinet probe is outside the limits
permitted by the cabinet probe in use (verify that the temperature near the cabinet probe be
inside the limits permitted by the cabinet probe); during this alarm the output K 1 gets forced
to the status established with the parameter C3, if a defrost cycle is running the defrost cycle
ends and the instrument never activates a defrost cycle.
If the instrument displays the indication E1 flashing and the buzzer utters an intermittent
beep (evaporator probe failure alarm) it means that there is one of the faults saw in the
previous case but referred to the evaporator probe; during this alarm, if the parameter F0 has
value 0 the output K 2 gets forced to the same status of the output K 1, if the parameter F0 has
value 1 the output K 2 remains continuously activated, except what established with the param-
eters d7, F3, F4 and F5 and the defrost ends passed the defrost maximum length.
If the instrument displays the temperature read by the cabinet probe flashing and the buzzer
utters an intermittent beep (temperature alarm) it means that the temperature read by the
cabinet probe is outside the limit established with the parameter A1 or A2 (see the parameters
A0, A1 and A2); inactive.
ADDITIONAL INFORMATIONS
- if the parameter F0 has value 1 during an evaporator fans stoppage the LED L3 does
not flashe
- the alarm codes are related in order of precedence
- during a defrost cycle the temperature alarm is disabled.
TECHNICAL DATA
TECHNICAL DATA
Case: plastic black (PC-ABS), self-extinguishing.
Size: 74 x 32 x 65 mm (2.91 x 1.25 x 2.55 in.).
Installation: panel mounting, panel cutout 71 x 29 mm (2.79 x 1.14 in.),
with the equipped screw or spring brackets.
Type of protection: IP 54.
Connections: screw terminal blocks with pitch 5 mm (0.19 in., power
supply, inputs and outputs) for cables up to 2.5 mm² (0.38
in.²), five poles single line male connector with pitch 5.08
mm (0.2 in., serial port).
Ambient temperature: from 0 to +60 °C (+32 to +140 °F, 10 ... 90 % of not con-
densing relative humidity).
Power supply: 12 Vac/dc, 50/60 Hz, 1.5 VA.
Insulation class: II.
Alarm buzzer: incorporated.
Measure inputs: 2 (cabinet and evaporator probe) configurable for PTC/NTC
probes.
Digital inputs: 1 for the remote presentation of a request of a defrost cy-
cle (5 V, 1 mA) with NO contact.
Working range: from -50 to +150 °C (-58 to +199 °F) for PTC probe, from
-40 to +110 °C (-40 to +199 °F) for NTC probe.
Setting range: from -55 to +99 °C (-55 to +99 °F).
Resolution: 1 °C (1 °F).
Display: 3-digit display 12.5 mm (0.49 in.) high red LED display
with automatic minus sign, output status indicators.
Outputs: three NO contact 8 (3) A @ 250 Vac relays for one ½ HP @
250 Vac compressor, evaporator fans and defrost system
management.
Kind of defrost managed: to resistances (electrical) and to hot gas (reversal of cy-
cle), automatic, manual and remote.
Defrost management: for interval, stopping temperature and maximum length.
Serial port: TTL with EVCOBUS protocol communication, for the con-
nection to the CLONE configurer/cloner and RICS super-
vision systems.
HOW TO ORDER
CODING SYSTEM
Instrument name: EC 3-181.
Desired measure input: P (for PTC/NTC probes).
Desired power supply: 012 (12 Vac/dc).
Options: custom configuration, presetting to accept at the measure
inputs Pt 1000 probes, temperature display in °F, green
LED display, presetting for the connection to remote indi-
cator (the maximum distance that can be interfaced is
50 m, 164.04 ft.).
2 3