Question about Bosch AE-3.4 PowerStar 0.5 GPM Point-Of-Use Indoor Tankless Electric Water

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Trying to wire with a black & white wire, to a blue & red on unit.

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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

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

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

We hada power outage. The light on the power button from the noritz tankless water heater remote control does not come on.


I'd first try cutting electricity to the unit and then powering it back up; however, there's a good chance you unit was damaged from a voltage surge following the power return. If you have a volt meter, here are a few things to check:
-voltage across the gfi - the gfi is located on the bottom of the unit; it is a black box with a blue, white, green, black, and white wires coming into it. There should be about 100VAC across the blue/white and black/white pairs.
-If there's no voltage across either pair, your transformer is fried and needs to be replaced.
-If there is voltage across the blue/white but not the black/white, look for moisture in the bottom of the unit. If there's no visible moisture (indicating a leak), you may need to replace the gfi.
-If there's voltage on both sides of the gfi, measure voltage at the remote terminals (location depends on model). You should have 15VDC across the terminals. If there's no voltage, your circuit board is dead.

Good Luck!

Aug 04, 2010 | Noritz Tankless Water Heater Natural Gas...

1 Answer

We had a power outage. The light on the power button of the Noritz tankless water heater remote control does not come on. Help1


I'd first try cutting electricity to the unit and then powering it back up; however, there's a good chance you unit was damaged from a voltage surge following the power return. If you have a volt meter, here are a few things to check:
-voltage across the gfi - the gfi is located on the bottom of the unit; it is a black box with a blue, white, green, black, and white wires coming into it. There should be about 100VAC across the blue/white and black/white pairs.
-If there's no voltage across either pair, your transformer is fried and needs to be replaced.
-If there is voltage across the blue/white but not the black/white, look for moisture in the bottom of the unit. If there's no visible moisture (indicating a leak), you may need to replace the gfi.
-If there's voltage on both sides of the gfi, measure voltage at the remote terminals (location depends on model). You should have 15VDC across the terminals. If there's no voltage, your circuit board is dead.

Good Luck!

Aug 04, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Is there an eternal fuse?


There is a GFI on the bottom right hand corner of the heater. It is a black box with 5 wires on the bottom in this order: blue, white, green ground, black, and white. The voltage across the blue/white should be about 100VAC and the voltage across the black/white should also be 100VAC. If the black/white isn't registering any voltage, the gfi is tripped.

The GFI typically trips due to moisture in the unit; however, it can also be fried if there was a voltage surge while you were gone. Use a hair dryer to dry up any moisture inside the unit, specifically around the GFI. If the water is pooling or you see a visible drip coming from the top of the heater, you heat exchanger is probably leaking and needs to be replaced.

If you have voltage on both sides of your gfi, check the voltage at the remote terminals. You should have 15VDC. If there is no voltage, you circuit board is damaged and needs to be replaced. If there is voltage at the remote terminals but no display on your remote, then check your remote wiring.

Aug 01, 2010 | Noritz 6.9 Gallon Residential Direct Vent...

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

I need to know what wires go to each marking


com=common= [ L ](live)same, the one that kills you. =red/brown N - neutral=black/blue Earth=green or green&yellow striped old colours= red, black, & green. new colours= brown, blue & green/yellow. L,N E.......... If you are uncertain of your abilities to wire up ,ask a competent electrician .........your life is worth more than £50.00.

Mar 08, 2010 | Water Heaters

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.

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