Chromalox PK471-4 specifications Installation, General

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Installation

and

OPERATION INSTRUCTIONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

WCRT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Supersedes PK471-3)

PK471-4

161-562767-001

DECEMBER, 1998

WCRT Weather-Corrosion

Resistant Room

Thermostat

Specifications – Table A

 

Temperature

Switch

 

Maximum Rating

Model

Range (°F)

Action

Description

120 Vac

240 Vac

277 Vac

 

 

 

Full Load Inductive

16.0A

12.0A

10.0A

 

 

 

 

 

 

 

WCRT-100

40-100

SPDT

Locked Rotor

80.0A

60.0A

55.0A

 

 

 

 

 

 

 

 

 

 

Non-Inductive

25.0A

25.0A

22.0A

 

 

 

 

 

 

 

 

 

 

Pilot Duty

125VA

125VA

125VA

 

 

 

 

 

 

 

UL LISTED

Figure 1

GENERAL

Type WCRT thermostats are intended for use in harsh environ- ments. They tolerate continuous spraying with water, high humid- ity, airborne contaminates and moderately corrosive conditions. The nickel plated sensing bulb is attached directly to the bottom of the case where it is shielded from damage or accumulations of insulating particles. The molded Noryl case is sealed at the cover with a neoprene gasket and the adjusting knob opening is closed with a lubricated O ring. Underwriters Laboratories has tested the WCRT and found it meets the requirement for NEMA 4X areas.

High levels of accuracy and sensitivity, 21/2° differential, are pro- vided by the WCRT. Switching is done by heavy duty, precision, single stage, SPDT line voltage snap action switch. Setting is accomplished by rotating the adjusting knob. The dial face is print- ed with large, contrasting numbers and letters on a lustrous back- ground for good visibility. Color coding clearly identifies the func- tion of each conductor.

Applications – Automatically controls room temperature by turn- ing electric air heaters on and off. Can be used to control the air heaters directly, within thermostat rating. For higher ratings use thermostat with magnetic contactor. Place thermostat on inside wall, away from undue heating or cooling influences, about 4 feet above the floor.

NOTICE: Type WCRT thermostats are designed for temperature control service only. Because they do not fail safe, they should not be used for temperature limiting duty.

WARNING: Users should install adequate back-up controls and safety devices with their electric heat- ing equipment. Where the consequences of failure may be severe, back-up controls are essential. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations.

Principle of Operation – Control action of these thermostats is provided through the principle of liquid volume change. With a variation in temperature, the liquid in the sensing element expands or contracts, causing a bellows to actuate the switching mechanism.

WARNING: Not for use in hazardous environments as described in National Electrical Code. Failure to com- ply can result in explosion or fire.

LO Setting is positive open (black to red) for heating loads and is positive closed (black to blue) for cooling loads.

Note: It is not recommended to switch systems directly from heat- ing to cooling and vice versa.

© 2010 Chromalox, Inc.

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Contents General InstallationMounting WiringWiring Wiring Diagrams To check the operation of the cooling systems Testing and Operation

PK471-4 specifications

The Chromalox PK471-4 is a state-of-the-art heating solution designed for various industrial applications, offering unparalleled performance, efficiency, and reliability. One of the key features of the PK471-4 is its robust construction, featuring durable materials that ensure longevity and resistance to harsh environments. The unit is engineered for high-temperature control, making it suitable for processes that require precise thermal management.

One of the standout technologies incorporated into the PK471-4 is its advanced PID (Proportional-Integral-Derivative) control system. This sophisticated technology allows for accurate temperature regulation, reducing overshoot and maintaining stability. Operators benefit from the intuitive digital user interface, which simplifies real-time monitoring and adjustments, helping to optimize operational efficiency.

Another defining characteristic of the Chromalox PK471-4 is its exceptional energy efficiency. The heating elements are designed to minimize energy consumption while maximizing heat output. This not only reduces operational costs but also contributes to a more sustainable industrial practice by lowering carbon footprints. Additionally, the PK471-4's design includes insulation features that prevent heat loss and improve overall system efficiency.

The versatility of the PK471-4 makes it an ideal choice for a wide range of applications, from food processing and chemical manufacturing to HVAC systems. Its adaptability allows for seamless integration into existing industrial setups, making it a popular choice among engineers and facility managers looking for reliable heating solutions.

Safety is also a top priority in the design of the PK471-4. Equipped with multiple safety features, including over-temperature protection and circuit diagnostics, the unit helps to prevent accidents and ensures a safe working environment. These features are vital in industrial settings where unexpected failures can lead to significant downtime or safety hazards.

In summary, the Chromalox PK471-4 is a technologically advanced, efficient, and reliable heating solution suitable for a variety of industrial applications. Its high-performance capabilities, energy efficiency, and robust safety features make it a top choice for businesses aiming to enhance their operational effectiveness while maintaining high safety standards.
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