Question about Honeywell Programmable Thermostat Heater

1 Answer

Installing CM900 Honeywell into Junior 24 Bosch Combi

The honeywell manual wants me to connect 2 wires from points A and B in the honeywell to points labelled T1 and T2 in the boiler. The boiler manual doesn't use these letters but tells me I have a switched live, a live and a neutral (plus the neutral and live of the mains supply). Any ideas which the honeywell wants where?

Posted by on

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 70 Answers

What kind of boiler are using is this boiler a on the demand electric or gas? You need low voltage wires. If you get me make and model # of off boiler i can try and find wiring diagram . Tell me a little more about you heat system to. Like baseboard heat or in floor how many zones

Posted on Jan 16, 2009

  • 1 more comment 
  • Scott Magill Jan 16, 2009

    It looks like you need a 230volt thermostat so make sure the cm900 is a 230volt thermostat if it is connect supply to Ls , neutral to Ns and Lr is power when thermostat contact is closed. I will try and find wiring diagram for the cm900 it will take a little while. Do you have any information on the thermostat.

  • Scott Magill Jan 16, 2009

    have you got it to work. I haven't found anything on the cm900 t-stat

  • Scott Magill Jan 17, 2009

    Looks like you have to connect thermostat labled a to LS and B to LR.Sorry it took so long to find the cm900 thermostat you probaly have it installed by now. This will only work this way if you only have 1 thermostat in the hole house.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Initial setup power present but no lights are


Allot on the Honeywell digital, programmable thermostats need a 24 volt common wire to them, the old manual type thermostats, only need 2 wire, but the digital ones, need the common wire to run the lights and program.
They do make a digital, that will run on battery power only, so they require only 2 wires.
Have a great Day.
Sincerely,
Paul

Mar 23, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

Replacing WHITE-RODGERS manual thermostat with 3 wires ( red, white, blue and installing Honeywell electronic thermostat RTH110B, how do I connect it? The heating is not central, baseboard heating.


I have only seen one Honeywell thermostat that would work with a 3-wire heating system.

I would replace it with a White-Rodgers 1F80-0471. They are about $100, but they are a good thermostat, and they work well with the 3-wire zone valves.

Most other thermostats have the "Y" terminal that you need, but do not control the zone valve correctly.

Helping Hands Services
- Fairbanks, Alaska -

Jan 30, 2010 | Honeywell Electronic Programmable...

2 Answers

Require room thermostat for ferroli combi boiler optimax 25c . I have a honeywell at the moment which stopped working. it has two wires coming into it from the boiler


Get a Ferroli wireless programmable room stat. City plumbing supplies can get hold of them but you'd be looking at approx £130. Part number 30800009. No wiring involved, the receiver connects to the boiler pcb. Had same problem but now fine.

Feb 18, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Installing a honeywell CM900 wireless programmable thermostat


the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.

Dec 04, 2007 | Honeywell Programmable Thermostat Heater

Not finding what you are looking for?
Heating & Cooling Logo

869 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

paulcarew

Level 3 Expert

2404 Answers

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...