Robertshaw Ranco ETC Single Stage Electronic Temperature Control Manuale utente
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INSTALLATION DATA
ETC SINGLE STAGE ELECTRONIC
TEMPERATURE CONTROL
The Ranco® ETC is a microprocessor-based
family of electronic temperature controls,
designed to provide on/o control
for commercial heang, cooling, air
condioning and refrigeraon. The ETC
is equipped with a liquid crystal display
(LCD) that provides a constant read
out of the sensed temperature, and a
touch keypad that allows the user to
easily and accurately select the setpoint
temperature, dierenal and heang/
cooling mode of the operaon. Models
are available that operate on either line
voltage (120/208/240V AC) or low voltage
(24V AC).
APPLICATIONS
With its wide temperature setpoint range
and selectable heang or cooling modes,
the ETC can be used for a wide variety of
applicaons including refrigerated display
cases, walk-in and reach-in refrigerators,
milk coolers, refrigerated warehouses,
chillers, beer and beverage coolers,
tank heang, space and return air temperature
controls and condenser fan cycling.
FEATURES
• Wide setpoint temperature range (-30°F to 220°F) and dierenal
adjustment (1°F to 30°F)
• Simple keypad programming of setpoint temperature, dierenal
and cooling/heang modes
• LCD display readout of sensor temperature, control sengs,
relay status and onboard diagnoscs
• LED (Light Eming Diode) backlight to improve visibility of the display
in low light ambient applicaons.
• IP67 rated (water and dust resistant) thermistor-based probe to
remotely monitor temperature
• The sensor probe can be retroed in the eld by the use of factory
installed interconnect
• Remote temperature sensing up to 400 feet
• SPDT output relay
• User-selectable Fahrenheit/Celsius scales
• Lockout switch to prevent tampering by unauthorized personnel
• Choice of line voltage and low voltage models available
• Oponal 0 to 10 volt analog output available for remote temperature
indicaon
• An-short Cycle Compressor Delay for cooling applicaons
SPECIFICATIONS
Input Voltage 120 or 208/240V AC (24V AC oponal), 50/60 Hz
Temperature Range -30°F to 220°F
Dierenal Range 1°F to 30°F
Switch Acon SPDT
Sensor Thermistor, 1.94in. long x 0.25 in. diameter with
8 . cable, IP67 rated
Power Consumpon 120/208/240V AC: 100 Milliamps
24V AC: 2 - 6 VA
1
Relay Electrical Rangs 120V 208/240V
NO Contact
Full-load Amps 16 Amps 8 Amps
Locked rotor Amps 96 Amps 48 Amps
Resisve Amps 15 Amps 8 Amps
Horsepower 1 HP 1 HP
NC Contact
Full-load Amps 5.8 Amps 2.9 Amps
Locked rotor Amps 34.8 Amps 17.4 Amps
Resisve Amps 5.8 Amps 2.9 Amps
Horsepower 1/4 HP 1/4 HP
Pilot Duty: 125 VA at 120/208/240V AC
Control Ambient Temperature
Operang -20°F to 140°F (-29°C to 60°C)
Storage -40°F to 176°F (-40°C to 80°C)
Ambient Humidity 0 to 95%, RH, Non-condensing
0 to 10V Output Impedance 1K
Enclosure NEMA 1, Plasc
Agency Approvals UL Listed, File E94419, Guide XAPX
CSA Cered, File LR68340, Class 4813 02
ETC ORDERING INFORMATION
Uni-Line OEM Input No. of 0 - 10 V
Numbers Numbers Voltage Stages Output
ETC-111000-000 ETC-111020-000 120/240 1 No
ETC-111100-000 ETC-111120-000 120/240 1 Yes
ETC-112000-000 ETC-112020-000 24 1 No
ETC-112100-000 ETC-112120-000 24 1 Yes
OPERATION
Liquid Crystal Display (LCD)
The LCD display provides a constant read out of the sensor temperature
and indicates if the output relay is energized. When the S1 annunciator
is constantly illuminated during operaon, the relay is energized. The
display is also used with the keypad to allow the user to adjust the
setpoint temperature, dierenal and heang/cooling modes.
Backlight
When any of the 3 mode keys are pressed, the backlight is acvated
and the ETC is in control mode. Press the SET key to begin program
mode.
Control Setup
The temperature setpoint refers to the temperature at which the
normally open (NO) contacts of the output relay will open. Determine
the load (s) to be controlled and the operang mode required, cooling
or heang. Refer to Figure 1 for a visual representaon.
• When the cooling mode is chosen, the dierenal is above the
setpoint. The relay will de-energize as the temperature falls to the
setpoint.
• An-short Cycle Compressor Delay for cooling. Aer a relay
de-energizes, the ETC will prevent the relay from turning on unl a
congurable me has occurred to protect compressor.
• When the heang mode is chosen, the dierenal is below the
setpoint. The relay will de-energize as the temperature rises to the
setpoint.
2
Programming Steps and Display Mode
The ETC can be programmed in four simple steps using the LCD display
and the three keys on the face of the control.
Step 1 To start programming, press the SET key once to access the
Fahrenheit/Celsius mode. The display will show the current
status, either F for degrees Fahrenheit or C for degrees
Celsius. Then press either the up Ç or down È arrow key
to toggle between the F or C designaon.
Step 2 Press the SET key again to access the setpoint. The LCD will
display the current setpoint and the S1 annunciator will
be blinking on and o to indicate that the control is in the
setpoint mode. Then press either the up Ç key to increase
or the down È key to decrease the setpoint to the desired
temperature.
Step 3 Press the SET key again to access the dierenal.
The LCD will display the current dierenal and the DIF 1
annunciator will be blinking on and o to indicate that the
control is in the dierenal mode. Then press either the
up Ç key to increase or the down È key to decrease the
dierenal to the desired seng.
Step 4 Press the SET key again to access the cooling or heang mode.
The LCD will display the current mode, either C1 for cooling
or H1 for heang. Then press either the up Ç or down È key
to toggle between the C1 or H1 designaon.
Step 5 Press the SET key again to access the An-short Cycle
Compressor Delay when in Cooling Mode. Press the up Ç or
down È keys to set the delay from 1 to 20 minutes. Press
SET key again to nish the programming.
Figure 1: Setpoint and Dierenal Sengs. Diagram indicates relay
on and o points in either the heang or cooling modes
Lockout Switch
The ETC is provided with a lockout switch to prevent tampering by
unauthorized personnel. When placed in the LOCK posion, the keypad
is disabled and no changes to the sengs can be made. When placed
in the UNLOCK posion, the keypad will funcon normally.
To access the lockout switch, disconnect the power supply and open
the control. The switch is located on the inside cover about 2 inches
above the boom. (See Figure 2). To disable the keypad, slide the
switch to the le LOCK posion. To enable the keypad, slide the switch
to the right UNLOCK posion. All ETC controls are shipped with this
switch in the UNLOCK posion.
LOCKOUT :
LOCK
UNLOCK
USE COPPER CONDUCTORS ONLY
DISPLAY CODES
F FAHRENHEIT
C CELSIUS
H1 HEAT STAGE 1
C1 COOL STAGE 1
EP PROBE FAILURE/
OUT OF RANGE
EE EEPROM FAILURE
E1 IMPROPER KEY
E2 MEMORY ERROR
RELAY RATINGS N.O /N.C.
VAC
120
208/240
LRA
96/34.8 48/17.4
FLA
16/5.8 8/2.9
15/5.8 8/2.9
RES A
PILOT DUTY 125VA
1
THERMOSTATS
52N8
Step Annunciator Descripon Display
1 F or C Fahrenheit or Celsius
Scale
2 S1 (blinking) Setpoint
Temperature
3 DIF 1(blinking) Dierenal
Temperature
4 C1/H1 Cooling or
Heang Mode
5 D1 Cooling Delay
Set to 1-20 Minutes
Figure 2: Lockout Switch
NOTE: The ETC will automacally end programming if no keys are
depressed for a period of thirty seconds. Any sengs that have
been input to the control will be accepted at that point.
All control sengs are retained in non-volale memory if power to
ETC is interrupted for any reason. Re-programming is not necessary
aer power outages or disconnects unless dierent control sengs
are required.
3
INSTALLATION INSTRUCTIONS
WARNING
Electrical Shock Hazard - Turn o power at the main
power source before installing the ETC control.
DO NOT restore electrical power to the unit unl the
ETC control is properly installed and cover assembled.
Fire Hazard - DO NOT locate the ETC control in an
explosive atmosphere as a re could result due to
possible spark generaon in the control.
All ETC Controls are designed as temperature controls
and are not used as temperature limit controls.
Where failure or malfuncon of the ETC control could
cause personal injury or property damage, other
devices (limit or safety controls) or systems (alarm
or supervisory) intended to warn or protect against
failure or malfuncon of the ETC control must
be installed.
CAUTION
Read all of the informaon in these instrucons before installing
or operang the ETC control.
The schemac drawings and other informaon included in these
installaon instrucons are for the purpose of illustraon and
general reference only.
ETC controls are not to be located in areas of signicant moisture,
dirt or dust as use of the control in such environment may cause
personal injury or property damage and is likely to shorten the
control life.
It is the responsibility of the installer and the user to assure
that the applicaon and use of the ETC control is in compliance
with all applicable federal, state, and local laws, regulaons and
ordinances, including, without any limitaon, all requirements
imposed under the Naonal Electric Code and any applicable
building codes.
INSTRUCTIONS CONCERNANT L’INSTALLATION
AVERTISSEMENT
Risque de choc électrique - Couper le courant à la
source d’alimentaon principale avant d’installer
le contrôleur ETC. NE PAS rétablir l’alimentaon
électrique de l’appareil avant que le contrôleur ETC ne
soit correctement installé et que le couvercle ne soit
assemblé.
Risque d’incendie - Ne pas placer le contrôleur ETC
dans une atmosphère explosive car un incendie
pourrait être déclenché par d’éventuelles éncelles
survenant dans le contrôleur.
Toutes les commandes de l’ETC sont conçues pour
contrôler la température et ne sont pas ulisées
comme témoins des limites de température.
Si une défaillance du contrôleur ETC peut causer
des blessures ou des dommages matériels, d’autres
disposifs (contrôles des limites ou de la sécurité) ou
des systèmes (d’alarme ou de surveillance) desnés
à prévenir ou à protéger contre une défaillance ou un
dysfonconnement du contrôleur ETC, doivent être
installés.
PRÉCAUTIONS
Lire toutes les informaons contenues dans ces instrucons avant
d’installer ou d’uliser le contrôleur ETC.
Les schémas et toutes les autres informaons gurant dans ces
instrucons d’installaon sont indiqués à des ns d’illustraon et
de référence générale seulement.
Les contrôleurs ETC ne doivent pas être placés dans des zones
ayant un taux d’humidité élevé, de la saleté ou de la poussière,
car l’ulisaon du contrôleur dans de tels environnements peut
engendrer des blessures ou des dommages matériels et est
suscepble de raccourcir la durée de vie du contrôleur.
Il est de la responsabilité de l’installateur et de l’ulisateur de
s’assurer que l’installaon et l’ulisaon du contrôleur ETC soit
faites en conformité avec tous les règlements, lois, et ordonnances
fédéraux, provinciaux, et locaux, y compris, sans y être limité,
toutes les exigences imposées par la Naonal Electric Code ainsi
que tous les codes du bâment, en vigueur.
TROUBLESHOOTING ERROR MESSAGES
Display Messages
E1 Appears when either the up Ç or down È key is pressed when not
in the programming mode.
To correct: If the E1 message appears even when no keys are being
pressed, replace the control.
E2 Appears if the control sengs are not properly stored in memory.
To correct: Check all sengs and correct if necessary.
EP Appears when the probe is open, shorted or sensing a temperature
that is out of range.
To correct: Check to see if the sensed temperature is out of range.
If not, check for probe damage by comparing it to a known
ambient temperature between -30°F and 220°F. Replace the
probe if necessary.
EE Appears if the EEPROM data has been corrupted.
To correct: This condion cannot be eld repaired.
Replace the control.
CL Appears if calibraon mode has been entered.
To correct: Remove power to the control for at least ve seconds.
Reapply power. If the CL message sll appears, replace the control.
4
CONTROL WIRING
General
• All wiring should conform to the Naonal Electric Code and local
regulaons.
• The total electrical load must not exceed the maximum rang of the
control (see Specicaons).
• Use copper conductors only.
• Electrical leads should not be taut; allow slack for temperature
change and vibraon.
Input and Output Wiring
For typical wiring diagrams, refer to Figures 4, 5 and 6. All connecons
are made to the power (lower) circuit board. When using the 24V AC
powered models, the 24V AC input lines must enter through the
sidewall of the case. Refer to Figure 3 for locaon of the entry hole and
Figure 7 for wiring.
Analog Output
ETC models are available with an oponal 0 to 10 volt analog output.
This signal is a linear representaon of the sensor temperature with
0 volts = -30°F and 10 volts = 220°F. See gure 8 for wiring informaon
and Figure 3 for locaon of the entry hole. The reference for this output
is designated by the ”-” symbol on the wiring diagram. The output
signal is designated by the ”+” symbol.
Figure 3: Dimensions (in Inches)
CONTROL MOUNTING
Mount the ETC to a wall or any at surface using a combinaon of any
two or more of the sloed holes located on the back of the control
case. The control’s components are not posion sensive, but should
be mounted so that they can be easily wired and adjusted. Avoid
excessive condions of moisture, dirt, dust and corrosive atmosphere.
The ETC has provisions for 1/2 inch conduit connecons. The conduit
hub should be secured to the conduit before securing the hub to the
plasc housing of the control. When using the conduit entry in the rear
of the case, a standard plug should be inserted into the conduit hole
in the boom. Cauon should be exercised not to damage the control
circuit board or wiring when installing a conduit connector.
ANTI-SHORT CYCLE COMPRESSOR DELAY
When the unit is congured for cooling and there is a call for cooling,
the relay will not acvate unl the An-short Cycle Compressor
Delay is sased. During an An-short Cycle Compressor Delay, the
temperature will alternate with Cd (Cooling Delay) to indicate the Relay
On is delayed.
5
Figure 5: Typical Wiring Diagram for 24V AC Power Input
and Line Voltage Switching.
Figure 7: Typical Wiring Diagram for 24V AC Power Input
and Line Voltage Switching.
Figure 4: Typical Voltage Wiring Diagram.
Figure 8: 0-10 V Analog Output Located on Power (Lower)
Circuit Board.
Figure 6: Dierent Voltage to Control and Dierent Voltage Load.
FIELD REPAIRS
Field calibrang or repairs to the ETC control must not be aempted.
Sensors and replacement controls are available through Ranco
wholesalers.
SENSOR MOUNTING
For space sensing, mount the sensor where it will be unaected by
heat/cool discharge or radiated heat sources. Spot sensing requires the
sensor to be in good contact with the surface being sensed. The sensor
can be inserted in a bulb well for immersion sensing.
Customer Service Telephone 1.800.304.6563
Customer Service Facsimile 1.800.426.0804
Robertshaw®, Ranco®, Paragon® and Uni-Line® are
trademarks of Robertshaw, its subsidiaries and/or
affiliated companies. All other brands mentioned
may be the trademarks of their respective owners.
For Technical Service
Telephone 1.800.445.8299
www.robertshaw.com
©2018 Robertshaw
02/18 –352-00007-00 Rev D
6
SPECIFICATIONS
The sensor is a negave temperature coecient (NTC) thermistor
sensor. The sensor resistance decreases with temperature increase. It
is .25 x 1.94 long with 8 feet #22 AWG cable. The termistor has a refer-
ence resistance of 30,000 ohms at 77°F (25°C).
Deg. C. Deg. F. RES. Nom.
-40 -40 1,010,000
-30 -22 531,000
-20 -4 291,200
-10 14 166,000
0 32 97,960
10 50 59,700
20 68 37,470
25 77 30,000
30 86 24,170
40 104 15,980
50 122 10,810
60 140 7,464
70 158 5,200
80 176 3,774
90 194 2,753
100 212 2,036
110 230 1,531
Figure 11:
Resistance vs. Temperature Sensor including 8 foot cable.
Figure 10
EXTENDING SENSOR
CAUTION: Sensor wiring splices may be made external from the control.
CAUTION: Disconnect power to control before wiring to avoid possible
electrical shock or damage to the controller.
Addional cable can be spliced to the sensor cable to increase the
length beyond the standard 8 feet. It can be extended up to 400 feet.
The cable should be at least 22 AWG or larger to keep addional
resistance to a minimum.
All splices and wire lengths added to the sensor cable should be made
according to acceptable wiring pracces and should conform to the
Naonal Electrical Code and local regulaons. Use copper conductors
only. Shielded cable is not required. The sensor is not polarity sensive.
Checkout Procedure
1. Before applying power, make sure installaon and wiring
connecons are correct.
2. Apply power to the control and observe one or more cycles
of operaon.
3. If performance indicates a problem, check sensor resistance
to determine if sensor or control is at fault.
4. To check sensor resistance, disconnect sensor and measure
the resistance across the leads while measuring temperature
at the sensor.
SENSOR REPLACEMENT
Figure 9: Sensor replacement on Display (Upper) Circuit Board.
Sensor Replacement
ETC models are available with Quick Connect Sensor feature that
allows for easy sensor replacement due to damage or wear. To access
the sensor connector, disconnect the power supply and open the
control. Remove single screw located in the center of the Display
Upper Circuit Board and carefully remove Display Board Circuit.
Remove Sensor Strain Relief to allow sensor to be removed from unit.
See Figure 3 for location of sensor strain relief. The sensor connection
is made at the P1 Connector on the Display Upper Circuit Board.
See figure 9 for connection information.
Replacement Sensor - Order
Uni-Line Number 1309007-044
(OEM Number 1309007-048)
SENSOR CONNECTOR
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1
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2
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3
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4
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5
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Robertshaw Ranco ETC Single Stage Electronic Temperature Control Manuale utente
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