Product Review: The Honeywell T775 Controller

The Honeywell T775 Series stand alone controllers have now been on the market for several years. This diverse controller offers the technician a multitude of installation options on one small package.

This controller that stands 8 inches wide by 4 inches wide can be mounted anywhere within 1000 feet of its sensor location and be purchased as a standard enclosure or a NEMA 4X enclosure.

The T775 has an EEPROM that saves all values entered. The date and time values are retained for 24 hours after power loss. After power loss of more than 24 hours values may need to be reentered.

IMPORTANT:  If a high limit set point is entered into a T775 controller this value is IRREVERSIBLE !!



Voltage: 24/120/240 note: cannot be used for DC voltages

Set Point Range: -40 to 248 F

T775A and B models:  relay outputs from 1 SPDT to 4 SPDT (no analog outputs). Sensor inputs 1 to 2. Floating outputs 0-to 2

T775M models:  Modulating with analog outputs of 2-10Vdc or 0-10 Vdc or 4-20 mA or Electronic Series 90.  Relay outputs from 0 to 4 SPDT. 2 sensor inputs


T775R models:  RESET OPTION.. 0 to 2 analog outputs 0 to 4 SPDT relay outputs. 0-2 floating outputs.

Sensors: update display and controller every 1 second


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C7100D1001 12 inch Duct Averaging Temperature Sensor

When the need for a standalone controller presents itself think Honeywell and let Stromquist and Company help you select the right controller for your needs. Give us a call… Atlanta 1-800-241-9471 or Orlando 1-800-638-7828

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7 Responses

  1. A 4-20 mA signal can be used on the all the Honeywell T775M series controllers. Only the T775R2019, the T775R2027, and the T775R2043 will accept the use of a 4-20 mA signal if you need reset. Almost forgot the Honeywell T775U2006 and T775U2016 will also use a 4-20 mA signal.

  2. What will be my parameter setting if my heating set point is 70 degrees F and my cooling set point is 74 degrees F. I am interested in the ideal differential and hi-lo limit using T775A/B/M 2000 Electronic Stand-Alone Controllers.

  3. Lino, I am not sure what you mean by parameter. Are you using the T775 to control one stage of heat and one stage of cool? A two to four degree differential ( dead band ) can work well in on/off applications. Sometimes you just have to play with the settings until you get the control you need. Tell us more about your application and we will see if we can help.

  4. Great question! Yes, you can use the T775M model and use the analog output, set one damper actuator to open as the other closes, so one damper Normally open the other normally closed.

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