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

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 tempera-

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

indicaon

• An-short Cycle Compressor Delay for cooling applicaons

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

Resisve amps 9.8 Amps 4.9 Amps

Horsepower 1/2 HP 1/2 HP

NC Contact

Full-load amps 5.8 Amps 2.9 Amps

Locked rotor amps 34.8 Amps 17.4 Amps

Resisve amps 5.8 Amps 2.9 Amps

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)

ETC ORDERING INFORMATION

Uni-Line OEM Input No. of 0 - 10 V

Numbers Numbers Voltage Stages Output

ETC-211000-000 ETC-211020-000 120/240 2 No

ETC-211100-000 ETC-211120-000 120/240 2 Yes

ETC-212000-000 ETC-212020-000 24 2 No

ETC-212100-000 ETC-212120-000 24 2 Yes

OPERATION

Liquid Crystal Display (LCD)

The LCD display provides a constant readout of the sensor temperature

Backlight

When any mode key is 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.

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.

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

Figure 2: Two Stage Cooling Example

Figure 1: Two Stage Heang Example

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 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

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 Ç or

down È key to toggle between the C1 or H1 designaon.

Step 5 Press the SET key again to access the An-short Cycle

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

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

Reapply power. If the CL message sll appears, replace the control.

Normal Operang Mode

Relay 1 ON S1

Relay 2 ON S2

*Note Cd alternates with temperature and relay

Program Mode Displays

Figure 5: Dimensions (Inches)

CONTROL MOUNTING

Mount the ETC to a wall or any at surface using a combinaon of any

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.

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

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.

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.

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.

ANTI-SHORT CYCLE COMPRESSOR DELAY

When the unit is configured for cooling and there is a call for cooling,

the relay will not activate until the Anti-short Cycle Compressor

Delay is satisfied. During an Anti-short Cycle Compressor Delay, the

temperature will alternate with Cd to indicate the Relay On is delayed.

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

is designated by the ”-” symbol on the wiring diagram. The output

signal is designated by the ”+” symbol.

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

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.

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.

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

2. Apply power to the control and observe one or more cycles

3. If performance indicates a problem, check sensor resistance

4. To check sensor resistance, disconnect sensor and measure