Question about RTO Home Heating Products 5.5HH240 Electric Tankless Water Heater 240 Volts

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Replacing older t86 two wire thermostataà

Replacing older t86 two wire thermostata with a ctk87.

old one had two wires,black and white.

new one has three possible connections,
what should the new color codes be?

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Brown goes to live black to nutral green to earth

Posted on Nov 16, 2009

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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.

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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

Water heater timer not working or bad wiring?


10/15/2012
Hi Liz.
This is a live answer. And you can add a comment after trying following step, and I will comment back..
Replace battery, and then reset the timer using reset button located to left of display screen.
http://waterheatertimer.org/pdf/eh40-english.pdf

Oct 15, 2012 | Intermatic EH40 - Electronic Water Heater...

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I have 240 timer switch and I wana use it for 120 ? How can I do that?


if the switch is rated for 240, then hook up the same way but use the 110 black and white wire for 110 volts to switch, instead of the red and black wire for 240 . on 110 black wire is always hot and the white is the neutral wire. the best wire to use is 12/2 with ground.

Jun 20, 2011 | Water Heaters

1 Answer

PowerStar AE9.5 isn't working. Bought new. Water lines are hooked up to the correct water lines. The 240V wire coming from the breaker is hooked up as follows: Uncovered copper wire connected to ground,...


Hi,
The unit will not owrk unless you have 240V ACROSS the black and white wires...if you do not have that coming to the unit then you have a bad breaker...

heatman101

Feb 19, 2011 | Bosch PowerStar AE9.5 AE9.5 Point-of-Use...

1 Answer

Wiring an electric water heater


Hello,You are correct! Black/blue=black & Yellow=white 220volt single phase power.There are 3 wires for 3 phase power connection NOT the case in a home.Also an "off peak"timer option would use (black) only controlling the bottom element and (blue) controlling the top element.

Apr 21, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

My hot water heater has a red and a black wire,but the electric supply wires coming in to power the water heater have a red,black white and a bare ground. Which wires go where?


Your 220v hot water heater does not need the neutral(white) wire coming in. Bare wire goes to ground -green headed screw. Black goes to black, Red goes to red. White gets teminated with a wirenut or some electrical tape.

Jan 24, 2010 | Rheem 80 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Wiring a wh40 intermatic timer to a sears hot water heater


Shut off breaker to you water heater. STILL TEST FOR VOLTAGE BEFORE YOU TOUCH ANY WIRING. The 3 wire that go to you water heater disconnect them. You are going to install them to your WH 40 timer.
The wires that you disconnected will now go to terminals: Black to Terminal 1 & White To Terminal 3, The Ground copper wire will go to the ground terminal should be a green screw.
You will have to buy some 10/2 wiring to go from your timer to your water heater. You can buy it by the foot at Lowes. Figure how much you will need.
With the new 10/2 wire install the Black to terminal 2 & White To Terminal 4, the ground wire will go to the ground screw with the other ground wire.
Wiring that went to terminals 2 & 4 will be installed to you water heater, the same way when you disconnected them. Set your timer clock and your done. Turn breaker back on!


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