Question about Water Heaters

Open Question

Replace existing old room thermostat with a new digital thermostat

I have 3 wires coming into my old Landis and Gyr room thermostat. Red to port6 Blue to port 4 and yellow to port 3. I have bought a new Honneywell Digital thermostat from screwfix which advised it was for a 3 wire connection. Only 2 wires can be connnected on the new thermostat with out breaking off a seal for the third wire. Can I connect the new thermostat with two wires and which ones - or do I need to connect the 3 wires and to where?

Thanks

regards

Gareth

Posted by on

  • kfournier May 11, 2010

    What type of heating system do you have...gas/oil/electric?

×

5 Suggested Answers

  • 171 Answers

SOURCE: Honeywell wall thermostat

Hi,Richmart
I'm Harvey the Plumber,
First, Your question is if your thermostat is wired correctly!

Assuming that it is correct, a common problem that most people and plumbers overlook is correctly setting the heat anticipater on the thermostat.
Assuming that you have a gas central heating system, then you must simply look on the gas valve for the amp rating.
For instance,if the gas valve printing says .4 amps then set the heat anticipater for .4
It's common for the unit to turn on and off erratically (short cycling) when this setting is not correct.
If all you are worryied about is the wiring, you must look at the wireing diagram that came with the thermostat.
Further diagnoses would requie detailed information about your central heating system.
Or the alternative would be to have a hands on tech help you out.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey

Posted on Sep 09, 2008

Da Brain
  • 11 Answers

SOURCE: Wiring a Drayton Room Stat into central heating system

9 TIMES OUT OF 10 THE COLORS ARE THE SAME. MATCH THEM UP. FIRST LABEL THE WIRES ON THE ORIGINAL STAT, AND PUT THEM IN THE CORRESPONDING PLACE ON NEW ONE.

Posted on Oct 27, 2008

  • 1 Answer

SOURCE: how to instal Generalaire 1137 Humidifier

you should have a plug for 115V, There should be two wires coming out of the bottom of the unit. These are for the humidistat. did you purchase this new??

Posted on Nov 10, 2008

muttandjeff
  • 359 Answers

SOURCE: Connecting a AE9.5

I would use # 8-2-with ground to have positive grounding at device , not 8-3 witch is more costly , also copper only no aluminum

Posted on Feb 01, 2009

SOURCE: I have just purchased and had installed a

Should be 2 low voltage wires.Hook one to termnal(R) and one to termnal(W) at boiler.

Posted on Apr 01, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have two wires coming from my old thermostat (1 black and 1 white), where do I connect these to on my new digital thermostat?


There are way too many types/brands/models of equipment for anyone to answer that question. Pictures and information on your old thermostat, new thermostat and the heater or ac unit it is controlling are going to be a ton of help.

Jan 24, 2016 | Lux Tx500 Series Smart Temp Electronic...

1 Answer

How can I make a thermostat connection?


Good morning Yakup.

The best way is to write down how the old t-stat was wired. If that's not available, the only way to determine for certain where each wire goes, is to check what the installer did at the terminals in your home comfort system. Please note the there is high voltage electric in each piece of equipment so if you decide to open up panels, there is always the risk of damaging the equipment or worse, injury or death if you are not a qualified service technician. However, typical color assignments are as follows:
R= (24v from heating appliance) Red
RC= (24v from cooling appliance) Red
These two are only separated when you have two different appliances providing seasonal comfort, like a boiler and an air handler. If you have a warm air furnace with an air conditioner or a heat pump attached then R+RC will have a jumper across them and only one RED wire will be landed there
W= (heat) White
Y= (cool) Yellow
G= (fan) Green
Those colors are pretty standard
The rest of the colors depend on availability in the jacket and are really up to the installer. You mentioned 7 wires but 8 conductors is more likely so I'm assuming the remaining colors are black, brown, blue, and orange.
I always use the following:
C= (common) Black
O/B= (reversing valve for a heat pump) Orange if the valve is energized for heat and Blue if the valve is energized for a/c.
Aux/E= (auxiliary or electric heat) Brown
L= I believe this is a diagnostic terminal for some systems with feedback data and is not used frequently.
After wiring there is some programing to do to set up your new thermostat to your type of system.

Hope that helps. God bless and be careful.

Aug 06, 2014 | Honeywell RTH6350D1000 5/2Day Prog...

1 Answer

Replacing a janitrol hpt 18-60 with a Filtrete 3m-22


What is the question that you have about this? What is the make and model of the hvac unit that it is running?

Apr 21, 2013 | Filtrete Thermostat. 7-Day Digital...

1 Answer

Water heater


Guessing that you have 240Volt residential non-simultaneous electric water heater? And that you have 30 amp breaker and 10 gauge wire. And that water heater is located within 100 feet of breaker box. And there are no leaks running hot water out of tank. And that you installed fully brand NEW elements of same wattage as old elements. And that fully brand new thermostats were installed, and wiring exactly duplicates wiring that was present before. And that factory-insulation was re-installed over elements and thermostats.

1) Guessing the 'hot water shut off' means the ECO red reset button located on upper thermostat keeps tripping and cutting off electric power to water heater?
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/images/WH-w-combined2-1000.jpg
http://waterheatertimer.org/How-to-test-water-heater-wires.html

2) If the ECO is tripping, then water is getting too hot, or there is shorted wire located near the upper thermostat, .
Typically replacing both thermostats and replacing elements will solve this problem .... assuming that new thermostats and elements are good, and wiring correct.
Double-Check your wiring on upper and lower thermostats.
Test wires for short.
Make sure factory-insulation is re-installed over thermostats so cool room temperature will not affect temperature reading.
Check that thermostats sit flat against steel tank.
Many short draws hot water can also cause stacking event that will trip circuit breaker.

3) Add comment and say what you find using checklist above.
Be careful to explain findings fully, using same words found on links above, so illuminated diagnosis can be made.

Dec 28, 2012 | Water Heaters

1 Answer

I replaced the heating elements(2) and switiches(2) on my Rudd electric hot water heater. Model PES 40-2. The switghes came with several wiring diagrams.(universal) Can I get a diagram specific to my...


Residential water heaters USUALLY follow same diagram unless water heater is wired for other purpose. Multiple diagrams on instructions show available options. Take photo of wiring before removing wires on any electrical device.
Upper element.
Black wire from top of heater connects to #1 top left screw.
Red wire from top connects to #3 top right screw.
Blue wire from upper element connects to #4 middle screw on right side
Red wire from lower element connects to #4 middle screw on right side
Yellow wire from upper element connects to #2 lower left screw
Black wire from lower thermostat connects to #4 lower right screw
Upper element: Yellow and Blue wires connect to either screw
Lower element: Red wire from top connects to either screw
Lower thermostat: Black wire from top connects to top screw
Short wire between lower thermostat and lower element

http://waterheatertimer.org/images/Water-heater-wiring-w-numbe.jpg
http://waterheatertimer.org/images/Thermostats-numbered-divided-500.jpg
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html

Sep 18, 2010 | Whirlpool Water Heaters

1 Answer

Wiring a Drayton Room Stat into central heating system


9 TIMES OUT OF 10 THE COLORS ARE THE SAME. MATCH THEM UP. FIRST LABEL THE WIRES ON THE ORIGINAL STAT, AND PUT THEM IN THE CORRESPONDING PLACE ON NEW ONE.

Oct 26, 2008 | Water Heaters

Not finding what you are looking for?
Water Heaters Logo

Related Topics:

87 people viewed this question

Ask a Question

Usually answered in minutes!

Top Water Heaters Experts

Donni Steen

Level 3 Expert

659 Answers

Brad Brown

Level 3 Expert

15109 Answers

Gil Shultz

Level 3 Expert

3368 Answers

Are you a Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...