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Heating and Cooling Controllers Fit Many Applications

Originally Published MPMN June 2004


Heating and Cooling Controllers Fit Many Applications

Microprocessor-based units offer flexibility and options

Susan Wallace
Heating and cooling controls from Fenwal are designed for fast, trouble-free installation and wiring.

The new Series 59 from Fenwal (Ashland, MA) comprises heating and cooling controls that can be tailored for many OEM applications. Features include added power-input choices, more sensor options, four different relay output options, alarm and time functions, and a wide operating temperature range. 

The controllers are designed for fast, trouble-free installation and wiring. They display temperature and other parameters on large LEDs, and provide accurate, stable control. Temperature is sensed by a thermistor, RTD, thermocouple, or solid-state relay, 
and then the controller turns a heater or refrigeration unit on or off as programmed. 

Set-point temperatures and other parameters are programmed using two push buttons on the face of the device. Differential and set-point offset values are fully adjustable, permitting application-specific programming for stable control and less-frequent cycling. Settings can be tamperproof, factory preset, or field adjustable. 

The Series-59 product line includes timer features that can sound an alarm or shut down processes at a predetermined temperature set point. The LED shows set-point or process temperature and error messages, and a status light indicates when the controller is heating or cooling.

The controller accepts 24-V ac or dc or 120/208/240-V ac power supplies. It can be used in conjunction with thermocouples or solid-state relays in addition to thermistors and RTD sensors. 

Output types include 5-A SPDT, 30-A SPST, and 15-A SPDT, and an SSR driver. The Series-59 controllers are certified to UL Standard 873. They meet the requirements of CSA Standard CAN C22.2 Mp. 24-93, and ANSI Z21.23 for gas appliance approval. CE approval is pending. 

Fenwal Controls

400 Main St.
Ashland, MA 01721
tel: 508/881-2000
fax: 508/881-7619

Copyright ©2004 Medical Product Manufacturing News

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