Ranco ETC-111000 - User Manual

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D71

ETC COMMERCIAL TEMPERATURE CONTROLS

RANCO ETC

COMMERCIAL

TEMPERATURE

CONTROLS

The Ranco ETC is a microprocessor-based family of temperature controls

designed to provide on/off control for commercial heating, cooling, air condi-

tioning and refrigeration applications. With its wide temperature range, one

and two stage capability, selectable heating/cooling modes and multi-voltage

input, the ETC is one of the most versatile temperature controls available.

DIGITAL DISPLAY

Unlike many electronic controls, the ETC is simple to install and set up. One

finger is all you need to program it. The standard digital display and keypad

allow the user to adjust the temperature settings with 1° resolution. Setpoint

temperature, differential and mode of operation (heating or cooling) can all be

selected using the keypad and display.

When not in the programming mode, the display gives a constant readout of

the sensor temperature. Annunciators on the liquid crystal display also indi-

cate when the relay is energized.

CHOICE OF ONE OR TWO STAGE MODELS

The ETC line includes both one and two stage models. On two stage con-

trols, each stage can be set independently thus eliminating the bothersome

task of calculating interstage temperatures. And two stage models can be set

up with overlapping heating or cooling stages.

REMOTE TEMPERATURE SENSING

The ETC is capable of remote temperature sensing up to 400 feet away from

the control when using standard 22 gauge sensor wire.

BUILT-IN SAFETY

Every ETC model is equipped with diagnostic programs that check for hard-

ware, software or system problems and display different error codes to indi-

cate where the trouble is.

The ETC also has a keypad lockout switch to prevent tampering with the

control settings by unauthorized personnel. The switch, which is located

inside the enclosure, can be used to disable the keypad function.

OPTIONAL ANALOG OUTPUT

ETC models are available with a 0 to 10 volt analog output that can be used

for remote temperature indication or as input to a central monitoring system.

This signal is a linear representation of the sensor temperature with 0 volt

–30°F and 10 volts = 220°F.

ETC-111000

SPECIFICATIONS

Temperature setpoint range –30° to 220°F

Differential range 1°F to 30°F

Input power requirements 120 or 208/240 VAC (24 VAC optional)

Sensor Thermistor, 2" long x 1/4" dia. with 8' cable

Control Ambient Temperatures

Operating –20°F to 140°F

Storage –40°F to 176°F

Ambient humidity 0 to 95% RH, non-condensing

Enclosure NEMA 1, plastic (NEMA 4X optional)

Dimensions NEMA 1 models, 6.52" high x 2.7" wide x 2.48" deep

NEMA 4X models, 7.84" high x 2.7" wide x 2.48" deep

0 to 10 V output impedance 1 K ohms

Agency Approvals UL listed, file E94419, Guide XAPX

CSA certified, file LR68340. class 4813 02

Switch action SPDT

RELAY OUTPUT RATINGS - NO (NC): ONE STAGE TWO STAGE

120V 208/240V 120V 208/240V

Full load amps 16 (5.8) A 8 (2.9) A 9.8 (5.8) A 4.0 (2.9) A

Locked rotor amps 96 (34.8) A 48 (17.4) A 58.8 (34.8) A 29.4 (17.4) A

Resistive amps 15 (5.8) A 8 (2.9) A 9.8 (5.8) A 4.9 (2.9) A

Horsepower 1 (1/4) HP 1 (1/4) HP 1/2 (1/4) HP 1/2 (1/4) HP

Pilot duty 125VA at 120/208/240 VAC

ORDERING DATA

UNI-LINE NUMBER INPUT 0 TO 10 VOLT

ORDER NO. OF STAGES ENCLOSURE VOLTAGE OUTPUT

ETC-111000 NO

ETC-111100 YES

ETC-112000 NO

ETC-112100 YES

ETC-141000 NEMA 4 NO

ETC-211000

ETC-211100 YES

ETC-212000 NO

ETC-212100 YES

ETC-241000 NEMA 4 120/208/240 VAC NO

ONE

TWO

NEMA 1

120/208/240 VAC

24 VAC

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Summary

Product Description

Built-in Safety Features

Highlights diagnostic programs and keypad lockout for safety.

Specifications

Relay Output Ratings

Provides electrical ratings for the relay contacts (NO/NC).

Troubleshooting Error Messages

Display Messages

Details specific error codes (E1, E2, EP, EE, CL) and their meanings.

The Ranco ETC (Electronic Temperature Control) is a microprocessor-based family of temperature controls designed for on/off control in commercial heating, cooling, air conditioning, and refrigeration applications. Its versatility stems from a wide temperature range, one or two-stage capability, selectable heating/cooling modes, and multi-voltage input.

Function Description

The ETC provides precise temperature management for various commercial and industrial settings. It can be used in refrigerated display cases, walk-in and reach-in refrigerators, milk coolers, refrigerated warehouses, chillers, beer and beverage coolers, tank heating, space and return air temperature control, and condenser fan cycling. The control operates by sensing temperature remotely and activating or deactivating a relay based on user-defined setpoints and differentials.

Important Technical Specifications

Temperature Setpoint Range: -30°F to 220°F (-29°C to 104°C).
Differential Range: 1°F to 30°F.
Input Power Requirements: Available in 120/208/240 VAC (50/60 Hz) or 24 VAC (2-6 VA) options.
Sensor: NTC thermistor, 1.94 inches long x 0.25 inches in diameter, with an 8-foot cable. The sensor resistance decreases with increasing temperature, with a reference resistance of 30,000 ohms at 77°F (25°C). Remote sensing is possible up to 400 feet with standard 22 gauge sensor wire.
Control Ambient Temperatures:
- Operating: -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.
Enclosure: NEMA 1 (plastic) standard, with NEMA 4X (plastic) optional for enhanced protection.
- NEMA 1 Dimensions: 6.52" high x 2.7" wide x 2.48" deep.
- NEMA 4X Dimensions: 7.84" high x 2.7" wide x 2.48" deep.
Output Relay: SPDT (Single Pole Double Throw).
- One Stage (NO Contact):
  - 120V: Full-load 16 A, Locked rotor 96 A, Resistive 15 A, 1 hp.
  - 208/240V: Full-load 8 A, Locked rotor 48 A, Resistive 8 A, 1 hp.
- One Stage (NC Contact):
  - 120V: Full-load 5.8 A, Locked rotor 34.8 A, Resistive 5.8 A, 1/4 hp.
  - 208/240V: Full-load 2.9 A, Locked rotor 17.4 A, Resistive 2.9 A, 1/4 hp.
- Two Stage (NO Contact):
  - 120V: Full-load 9.8 A, Locked rotor 58.8 A, Resistive 9.8 A, 1/2 hp.
  - 208/240V: Full-load 4.0 A, Locked rotor 29.4 A, Resistive 4.9 A, 1/2 hp.
- Pilot Duty: 125 VA at 120/208/240 VAC.
Optional Analog Output: 0 to 10 VDC, with 1 K ohm output impedance. This signal linearly represents sensor temperature, where 0 volts corresponds to -30°F and 10 volts to 220°F.
Agency Approvals: UL listed (file E94419, Guide XAPX) and CSA certified (file LR68340, Class 4813 02).

Usage Features

Digital Display and Keypad: The ETC features a standard digital LCD display and a three-button keypad for easy programming. The display provides a constant readout of the sensor temperature, annunciators for relay status, and error messages.
Simple Programming: Programming is a four-step process:
1. Select Fahrenheit or Celsius scale.
2. Set the desired temperature setpoint.
3. Adjust the differential (hysteresis).
4. Choose between cooling (C1) or heating (H1) mode. Settings are retained in non-volatile memory even after power interruptions.
One or Two-Stage Models: Available in both one and two-stage configurations. Two-stage models allow independent setting of each stage, including overlapping heating or cooling stages.
Remote Temperature Sensing: The ETC can sense temperature up to 400 feet away from the control unit, allowing for flexible sensor placement.
Lockout Switch: An internal lockout switch prevents unauthorized tampering with control settings. When in the "LOCK" position, the keypad is disabled.
Diagnostic Programs: Built-in diagnostic programs check for hardware, software, or system problems and display specific error codes (E1, E2, EP, EE, CL) to aid in troubleshooting.
Mounting: The control can be mounted to a wall or any flat surface using slotted holes on the back of the case. It has provisions for 1/2 inch conduit connections.

Maintenance Features

Error Messages: The LCD displays specific error codes to assist in diagnosing issues:
- E1: Indicates an improper key press or a stuck key.
- E2: Indicates control settings are not properly stored in memory.
- EP: Indicates a probe failure (open, shorted, or out of range). Troubleshooting involves checking the sensor's temperature range and physical integrity.
- EE: Indicates corrupted EEPROM data, requiring control replacement.
- CL: Indicates entry into calibration mode, requiring a power cycle.
Sensor Replacement: The sensor (Part No. 1309007-044) is a replaceable component.
Installation Guidelines: Emphasizes compliance with National Electric Code and local regulations, proper wiring (copper conductors only, slack in leads), and avoiding taut electrical leads to prevent damage from temperature change and vibration.
Environmental Considerations: Advises against locating the control in explosive atmospheres, or areas with significant moisture, dirt, dust, or corrosive environments to ensure safety and prolong control life.
Safety Precaution: All ETC series controls are designed as operating controls only. If a control failure could result in personal injury or property loss, a separate safety control and/or alarm should be installed.