Heating and Cooling Controllers Fit Many Applications

OriginallyPublished MPMN June 2004

HOTLINE

Heating and Cooling Controllers Fit Many Applications

Microprocessor-based units offer flexibility and options

Susan Wallace

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 parameterson 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 arefully adjustable, permitting application-specific programming for stable controland 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 heatingor cooling.

The controller accepts 24-V ac or dc or 120/208/240-V ac power supplies. It can beused in conjunction with thermocouples or solid-state relays in addition to thermistorsand 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
url: www.fenwaycontrols.com

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