Robertshaw RANCO ETC Series User manual

INSTALLATION DATA
ETC Two STagE
ElECTroniC TEmpEraTurE
ConTrol
The Ranco® ETC is a microprocessor
based family of electronic temperature
controls, designed to provide on/o
control for commercial heang, cooling,
air condioning and refrigeraon. The ETC
is equipped with a liquid crystal display
(LCD) that provides a constant readout
of the sensed temperature, and a touch
keypad that allows the user to easily and
accurately select the setpoint temperature,
dierenal and heang/cooling mode
of the operaon. 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 heang or cooling modes,
the ETC can be used for a wide variety of
applicaons including mulple compressor
control, two stage heang, venlaon
control, automac changeover, condenser
fan cycling, space and return air temperature
control, water cooled condensers and control
with alarm funcon.
FEATURES
• Wide setpoint temperature range (-30°F to 220°F) and dierenal
adjustment (1°F to 30°F)
• Simple keypad programming of setpoint temperature, dierenal and
cooling/heang modes
• Two individually programmable stages for heang and/or cooling
• LCD display readout of sensor temperature, control sengs, relay
status and onboard diagnoscs
• LED (Light Eming Diode) backlight to improve visibility of the display
in low light ambient applicaons.
• IP67 rated (water and dust resistant) thermistor-based probe to
remotely monitor temperature
• The sensor probe can be retroed in the eld by the use of factory
installed interconnect
• Remote temperature sensing up to 400 feet
• Two SPDT output relays
• User-selectable Fahrenheit/Celsius scales
• Lockout switch to prevent tampering by unauthorized personnel
• Choice of line voltage and low voltage models available
• Oponal 0 to 10 volt analog output available for remote temperature
indicaon
SPECIFICATIONS
Input Voltage 120 or 208/240V AC (24V AC oponal), 50/60 Hz
Temperature Range -30°F to 220°F
Dierenal Range 1°F to 30°F
Switch Acon SPDT
Sensor Thermistor, 1.94 in. long x 0.25 in. diameter
with 8 . cable, IP67 rated
Power Consumpon 120/208/240V AC: 100 milliamps
24V AC: 2-6V AC
1
Relay Electrical Rangs
120V 208/240V
NO Contact
Full-load amps 9.8 A 4.9 A
Locked rotor amps 58.8 A 29.4 A
Resisve amps 9.8 A 4.9 A
Horsepower 1/2 hp 1/2 hp
NC Contact
Full-load amps 5.8 A 2.9 A
Locked rotor amps 34.8 A 17.4 A
Resisve amps 5.8 A 2.9 A
Horsepower 1/4 hp 1/4 hp
Pilot Duty: 125 VA at 120/208/240 VAC
Control Ambient Temperature
Operang -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, Plasc
Agency Approvals UL Listed, File E94419, Guide XAPX
CSA Cered, File LR68340, Class 4813 02
ETC ORDERING INFORMATION
Input No. of 0 - 10 V
Part Numbers Voltage Stages Output
ETC-211020-000 120/240 2 No
ETC-211120-000 120/240 2 Yes
ETC-212020-000 24 2 No
ETC-212120-000 24 2 Yes
OPERATION
Liquid Crystal Display (LCD)
The LCD display provides a constant readout of the sensor temperature
and indicates if either of the two output relays is energized. When the
S1 annunciator is constantly illuminated during operaon, the Stage 1
relay is energized. Likewise, when the S2 annunciator is constantly
illuminated during operaon, the Stage 2 relay is energized. The display
is also used with the keypad to allow the user to adjust the setpoint
temperatures, dierenals and heang/cooling modes for each stage.
Backlight
When any of the 3 mode keys are pressed, the backlight is acvated
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 loads to be controlled and the operang modes required for each
stage, cooling or heang.
•
When the cooling mode is chosen, the dierenal is above the setpoint.
The relay will de-energize as the temperature falls to the setpoint.
•
When the heang mode is chosen, the dierenal is below the setpoint.
The relay will de-energize as the temperature rises to the setpoint.
The ETC two stage control can be set up for two stages of heang, two
stages of cooling or one stage cooling plus one stage heang. Refer to
Figures 1, 2 and 3 for a visual representaons of dierent control setups.

2
Programming Steps and Display Mode
The ETC two stage can be programmed in seven 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 Ffor degrees Fahrenheit or Cfor degrees
Celsius. Then press either the up Çor down Èarrow key
to toggle between the For C designaon.
Stage 1
Step 2 Press the SET key again to access the stage 1 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 Çkey to increase
or the down Èkey to decrease the setpoint to the desired
temperature.
Step 3 Press the SET key again to access the stage 1 dierenal.
The LCD will display the current dierenal and the DIF 1
annunciator will be blinking on and o to indicate that the
control is in the dierenal mode. Then press either the
up Çkey to increase or the down Èkey to decrease the
dierenal to the desired seng.
Step 4 Press the SET key again to access the stage 1 cooling or heang
mode. The LCD will display the current mode, either C1 for
cooling or H1 for heang. Then press either the up Çor
down Èkey to toggle between the C1 or H1 designaon.
Stage 2
Step 5 Press the SET key again to access the stage 2 setpoint. The
LCD will display the current setpoint and the S2 annunciator
will be blinking on and o to indicate that the control is in the
setpoint mode. Then press either the up Çkey to increase
or the down Èkey to decrease the setpoint to the desired
temperature.
Step 6 Press the SET key again to access the stage 2 dierenal.
The LCD will display the current dierenal and the DIF 2
annunciator will be blinking on and o to indicate that the
control is in the dierenal mode. Then press either the
up Çkey to increase or the down Èkey to decrease the
dierenal to the desired seng.
Step 7 Press the SET key again to access the stage 2 cooling or heang
mode. The LCD will display the current mode, either C2 for
cooling or H2 for heang. Then press either the up Çor
down Èkey to toggle between the C2 or H2 designaon.
Press the SET key once more and programming is complete.
Refer to Page 3 for an illustrated guide to programming the ETC.
NOTE: The ETC will automacally end programming if no keys are
depressed for a period of thirty seconds. Any sengs that have
been input to the control will be accepted at that point.
All control sengs are retained in non-volale memory if power to
ETC is interrupted for any reason. Re-programming is not necessary
aer power outages or disconnects unless dierent control sengs
are required.
Figure 3: One Stage Cooling and One Stage Heang Example
Figure 2: Two Stage Cooling Example
Figure 1: Two Stage Heang Example

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 unl 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 generaon in the control.
All ETC Controls are designed as temperature controls
and are not used as temperature limit controls.
Where failure or malfuncon 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 malfuncon of the ETC control must
be installed.
Lockout Switch
The ETC is provided with a lockout switch to prevent tampering by
unauthorized personnel. When placed in the LOCK posion, the keypad
is disabled and no changes to the sengs can be made. When placed
in the UNLOCK posion, the keypad will funcon 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 boom. (see Figure 4). To disable the keypad, slide the
switch to the le LOCK posion. To enable the keypad, slide the switch
to the right UNLOCK posion. All ETC controls are shipped with this
switch in the UNLOCK posion.
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 Descripon Display
1 For CFahrenheit or Celsius
Scale
2 S1 (blinking) Stage 1 Setpoint
Temperature
3 DIF 1 (blinking) Stage 1 Dierenal
Temperature
4 C1/H1 Stage 1 Cooling or
Heang Mode
5 S2 (blinking) Stage 2 Setpoint
Temperature
6 DIF 2 (blinking) Stage 2 Dierenal
Temperature
7 C2/H2 Stage 2 Cooling or
Heang Mode
Figure 4: Lockout Switch
INSTRUCTIONS CONCERNANT L’INSTALLATION
AVERTISSEMENT
Risque de choc électrique - Couper le courant à la
source d’alimentaon principale avant d’installer le
contrôleur ETC. NE PAS rétablir l’alimentaon élec-
trique 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 éncelles
survenant dans le contrôleur.
Toutes les commandes de l’ETC sont conçues pour
contrôler la température et ne sont pas ulisées com-
me témoins des limites de température.
Si une défaillance du contrôleur ETC peut causer
des blessures ou des dommages matériels, d’autres
disposifs (contrôles des limites ou de la sécurité) ou
des systèmes (d’alarme ou de surveillance) desnés
à prévenir ou à protéger contre une défaillance ou un
dysfonconnement du contrôleur ETC, doivent être
installés.
TROUBLESHOOTING ERROR MESSAGES
Display Messages
E1 Appears when either the up Çor down Èkey 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 sengs are not properly stored in memory.
To correct: Check all sengs 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 condion cannot be eld repaired.
Replace the control.
CL Appears if calibraon mode has been entered.
To correct: Remove power to the control for at least ve seconds.
Reapply power. If the CL message sll appears, replace the control.

4
Figure 5: Dimensions (Inches)
CONTROL MOUNTING
Mount the ETC to a wall or any at surface using a combinaon of any
two or more of the sloed holes located on the back of the control
case. The control’s components are not posion sensive, but should
be mounted so that they can be easily wired and adjusted. Avoid
excessive condions of moisture, dirt, dust and corrosive atmosphere.
The ETC has provisions for 1/2 inch conduit connecons. The conduit
hub should be secured to the conduit before securing the hub to the
plasc 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 boom. Cauon should be
exercised not to damage the control
circuit board or wiring when installing
a conduit connector.
CAUTION
Read all of the informaon in these instrucons before installing
or operang the ETC control.
The schemac drawings and other informaon included in these
installaon instrucons are for the purpose of illustraon and
general reference only.
ETC controls are not to be located in areas of signicant 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 applicaon and use of the ETC control is in compliance
with all applicable federal, state, and local laws, regulaons and
ordinances, including, without any limitaon, all requirements
imposed under the Naonal Electric Code and any applicable
building codes.
PRÉCAUTIONS
Lire toutes les informaons contenues dans ces instrucons avant
d’installer ou d’uliser le contrôleur ETC.
Les schémas et toutes les autres informaons gurant dans ces
instrucons d’installaon sont indiqués à des ns d’illustraon 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’ulisaon du contrôleur dans de tels environnements peut
engendrer des blessures ou des dommages matériels et est
suscepble de raccourcir la durée de vie du contrôleur.
Il est de la responsabilité de l’installateur et de l’ulisateur de
s’assurer que l’installaon et l’ulisaon 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 Naonal Electric Code ainsi
que tous les codes du bâment, en vigueur.

5
CONTROL WIRING
General
• All wiring should conform to the Naonal Electric Code and local
regulaons.
• The total electrical load must not exceed the maximum rang of the
control (see Specicaons).
• Use copper conductors only.
• Electrical leads should not be taut; allow slack for temperature
change and vibraon.
Input and Output Wiring
For typical wiring diagrams, refer to Figures 6 and 7. All connecons 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 5 for locaon of the entry hole.
Analog Output
ETC models are available with an oponal 0 to 10 volt analog output.
This signal is a linear representaon of the sensor temperature with
0 volts = -30°F and 10 volts = 220°F. See gure 8 for wiring informaon
and Figure 5 for locaon 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 8: 0-10 V Analog Output
Located on Power (Lower) Circuit Board
Figure 7: Typical Wiring Diagram for 24 VAC Power Input
and Line Voltage Switching.
Figure 6: Typical Voltage Wiring Diagram.
FIELD REPAIRS
Field calibrang or repairs to the ETC control must not be aempted.
Sensors and replacement controls are available through Ranco
wholesalers.
SENSOR MOUNTING
For space sensing, mount the sensor where it will be unaected 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 [phone]
Customer Service Facsimile 1.800.426.0804
[email protected]
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 [phone]
[email protected]
www.uni-line.com
www.robertshaw.com
©2015Robertshaw
08/15–352-00008-00
6
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.
Addional 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 addional
resistance to a minimum.
All splices and wire lengths added to the sensor cable should be made
according to acceptable wiring pracces and should conform to the
Naonal Electrical Code and local regulaons. Use copper conductors
only. Shielded cable is not required. The sensor is not polarity sensive.
Checkout Procedure
1. Before applying power, make sure installaon and wiring
connecons are correct.
2. Apply power to the control and observe one or more cycles
of operaon.
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 5 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
Part No. 1309007-048
Figure 10
SPECIFICATIONS
The 1309007-048 sensor is a negave temperature coecient (NTC)
thermistor sensor. The sensor resistance decreases with temperature
increase. It is .25 x 1.94 long with 8 feet #22 AWG cable. The thermistor
has a reference 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 of 1309007-048.
Sensor including 8 foot cable.
SENSOR CONNECTOR