Ss Brewtech’s Biggest Baddest Holiday Giveaway Ever!

Home Brew Forums > Home Brewing Beer > DIY Projects > Brew Stands > Honeywell / Computer Cord Mod
Thread Tools
Old 01-25-2013, 08:29 PM   #1
Feedback Score: 0 reviews
Join Date: Feb 2012
Location: Redmond / Seattle
Posts: 33
Default Honeywell / Computer Cord Mod

Hey everyone,
Being an industrial engineer and not a EE... I need some help. I have a Honeywell RTH110B thermostat and an old computer cable. I would like to combine the two in order to power a small light for heating and a fan inside my fermentation chamber.

The thermostat I believe can handle 24v (not sure on amps) and act as a switch based on temp. The computer power cord has an input of 110-240v (1amp) and output of 19Vcc (2.1amp). Can I splice the output line into the thermostat connections (like hooking up a heater) and then supply a small bulb/fan? Or am I burning doing my house and better off spending the $50 on a controller...

Holgar is offline
Reply With Quote
Old 01-25-2013, 11:21 PM   #2
Feedback Score: 0 reviews
Join Date: May 2011
Location: Stow, MA
Posts: 14,567
Liked 2087 Times on 1623 Posts


That model thermostat is meant to be use as a low-voltage hvac controller. Meaning its outputs are to be used to control relays, and not directly drive loads (like heaters and compressors).

So to cobble together a heater controller, you'd need to add a 110vac to 24vac transformer and a relay with a 24vac coil and points sized for your heater amperage. Then, with the thermostat set for heating mode it would switch the relay which would carry the heater load.

By the time you combine the transformer, relay, and a box to hold everything, the cost might make an STC-1000 look pretty good...

day_trippr is online now
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTT Honeywell UDC BrotherGrim Automated Brewing Forum 0 06-24-2012 08:46 PM
Anyone every try PID on a Honeywell Solenoid? BrianL Brew Stands 0 06-29-2010 04:08 PM
Restoring Computer speed for the computer illiterate? Sea General Chit Chat 21 11-30-2008 02:58 AM
I need computer help! Freezing Computer Kayos General Chit Chat 58 06-06-2008 01:47 PM
Replacing 2-prong cord with grounded cord sphericalcamel Equipment/Sanitation 3 07-04-2007 03:31 PM

Forum Jump

Newest Threads