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

×

Ad

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.

×

Ad

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 there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

Installing a Honeywell TB8220U programmable thermostat. All of the wires are connected but AC will not come on. I believe I have a single-transformer system. I have the red wire connected to ''C'', since...


On the old thermostat how many and what terminals did you have?
Usually
R = Red One Side of 24 volt Transformer
RH = Usually jumpered to R or RC
C = Common the other side of the 24 volt transformer opposite the R
G = Green Blower
Y = Yellow Cool
W = White Heat

May 30, 2010 | Honeywell Electronic Programmable...

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

885 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

588 Answers

Paul Carew

Level 3 Expert

3280 Answers

vance jones

Level 2 Expert

120 Answers

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

Answer questions

Manuals & User Guides

Loading...