New Economizer Control


Just when you think you can’t learn anything new about economizers,  Honeywell is going to phase out all of those controls and is introducing a new control — the W7220.  Not that the information on the old controls is obsolete — there are still a lot of those economizers out there. One of the nice things about the new control is it has a screen on it and actually does diagnostics (see attached information at the end of this post).

Jade Econ ctl 1

This new control does use a new set of sensors for mixed / discharge air as well as enthalpy.  It can, however be used with the M7215 actuator currently being used.

Jade econ wd

C7250A1001/U 20k Temperature sensor for mixed or discharge air in roof top packaged equipment

?????????????????????????????????????????????????Overview
The C7250 Mixed Air sensor is designed for use as a 20k input to a controller for mixed air temperature in rooftop packaged air conditioning equipment. A separate controller such as the JADE™ Economizer System (Model W7220) provides power and communications for the C7250 Mixed Air sensor.

Product Specifications
Application: Electronic 20K temperature sensor for A 20K TEMPERATURE SENSOR INTENDED FOR SENSING MIXED OR DISCHARGE AIR IN ROOF TOP PACKAGED AIR CONDITIONING EQUIPMENT. USED WITH A W7220 ECONOMIZER CONTROLLER.

C7400S1000/U S-Bus Enthalpy Sensor – Outside, supply or return air

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Overview

Digital enthalpy (humidity/temperature) sensor for use with S-Bus devices and W7220 economizer controller

Features

  • This unit mounted C7400S enthalpy sensor includes solid state temperature and humidity sensors.
  • Outputs a digital communicating signal on a two-wire Sylkbus communications link, reporting the temperature and humidity separately to the controller.
  • The controller determines the enthalpy (total heat), enabling economizer modes of operation when outside air enthalpy is suitable for free cooling.
  • Enthalpy sensors are compatible with Honeywell economizer systems.
  • When used with an economizer, the enthalpy boundary curve is programmed via the controller. When the temperature and humidity are determined to be suitable based on the relationship to the boundary, the controller allows outside air for economizing.
  • Ambient temperature operating range from -40° to 150° F.
  • Dual enthalpy sensors in outside air and return switches the controllers to economizer mode of operation anytime the outside enthalpy is less than the return air enthalpy.

Application: Provides Honeywell SYLK Bus signal in relation to enthalpy – 5% accuracy Sensor for A SOLID STATE ENTHALPY SENSOR DESIGNED TO SENSE TEMPERATURE AND HUMIDITY WITH 5% ACCURACY. USE WITH W7220 ECONOMIZER CONTROL, FOR USE IN OUTDOOR AIR INTAKES OF HVAC ROOFTOPS

As these new controls are introduced, I will be learning about them and then creating  posts , as necessary about them.  For now, be aware that this is occurring and your manufacturer my be supplying you with a KIT to replace existing economizer components with these new one..

Honeywell JADE Econ1

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About yorkcentraltechtalk

I have been in the HVAC industry most of my life. I worked 25 years for contractors on anything from residential to large commercial boilers and power burners. For the past 23+ years I had been employed by York International UPG Division ( a division of Johnson Controls) as a Technical support/Service Manager but I am now retired. One of my goals has always been to "educate" dealers and contractors. The reason for starting this blog was to share some knowledge, thoughts, ideas, etc with anyone who takes the time to read it. The contents of this blog are my own opinions, thoughts, experiences and should not be construed as those of Johnson Controls York UPG in any way. I hope you find this a help. I always welcome comments and suggestions for postings and will do my best to address any thoughts, questions, or topics you may want to hear about. Thanks for taking the time to read my postings! Mike Bishop
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One Response to New Economizer Control

  1. grasshopper says:

    very good thanks for info.

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