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New Rheem 205,000 BTU Heater installed to replace Raypac 185,000. Very similar but not identical. Checked 240 volts red to black on supply before starting. Connected red to red, black to black, green to green. Display works fine. Word "SPK" appears when you move temp up to 102 degrees. You can hear the igniter firing but it does not light. Ideas? **** East 832 978 4654

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  • dickeast Jul 28, 2009

    Already bleed gas line to the front of the heater. Have no idea how to find pilot but will take a look when it cools down. If I don't get it today, I am oot of town for a bit and then will try agian. ****

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  • Master
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Well, first make sure that gas is flowing into the unit and then out of the gas valve as everything should be hooked up right from your description. I would also make sure that the igniter is lined up with the gas valve, possibly one is out of place and so they are not able to light. Let me know what you find.


Benjamin

Posted on Jul 28, 2009

  • Benjamin Patri
    Benjamin Patri Jul 28, 2009

    Alright, sounds good, will be looking for your next reply

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I have a new heater with diferant terminals from the old one so not sure how to atach the wires


There is no need to rewire the internal of the heater!
Just bring in the electrical supply to the heater, it can be either 120 or 240 volts.
If the heater you have is like the picture associated with your post, then all then have to do is change the supplied plug from 240 to 120. It comes pre set for 240. That plug is inside the cabinet.

If any other brand, then you need to change the wires at the transformer of the heater. All heaters need to be supplied with primary voltage: 120 or 240. Then the control system is supplied with secondary voltage out of the transformer. The secondary voltage is no more than 28 volts. and these wires are normally colored as blue or yellow.

Secondary power is already wired within the heater. NO need to change where they are. You will only need to deal with the Primary wiring.

There are many varieties of transformers that transform high primary voltage to a low secondary voltage of 28 volts. and these transformers have many wires: primary & secondary.
I will try to make this easy to understand.

If you have a Gas Heater Transformer with these colors:
  • Red
  • Black
  • White
  • Green
Or...
  • Red
  • White with Red Stripe
  • Black
  • White with Black Stripe
  • Green
These are Dual Voltage Transformers, you can bring in either 120 Volts or 240 Volts

If you bring in only 120 Volts...
1st example:
The Red wire will not be used! Hot wire to the Black, and the Neutral/Common, to the white wire. Green to ground.

2nd example:
Connect the Red wire with the White with Red Stripe together and connect these to the incoming Neutral/Common wire, normally White.
Connect the Black Wire with the White with Black Stripe to your incoming Hot Wire, which is normally Black.
Green to ground

If you bring in 240 Volts...
1st example.
1 Hot wire to the Red, the Other Hot wire to the Black, and White wire is not used. Green to ground

2nd Example:
Wire nut the two Striped wires together. then one incoming Hot wire to the Black, the other incoming Hot wire to Red.
Green to ground

Or This is only a Low voltage - 120 Volts Only
  • Black
  • White
  • Green
Or either any of these combinations...
  • 2 Blacks w/Green
  • 2 Reds w/Green
  • 1 Black, 1 Red w/green
This type will only be a high voltage, 240 volts only
Picture below is what a transformer looks like and it is where your incoming supply wires go. The smaller leads with the spade connections will go to a specific location & is the 'Secondary" .

Good Luck



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1 Answer

Rheem 27 instant electric hot water heater causes customer's home lighting to flicker.


According to the literature I read, this heater requires a DEDICATED 240 volt, 60 amp service minimum. That means it should have its own circuit breaker with nothing else on that line. Depending on the overall electric service size for the building, the heater is causing an overload when it's on and resulting in a voltage drop that causes the flickering and possibly other issues.

You didn't say if this was a residential installation but if it is, most homes have a 100 amp 240 volt service (in the USA). The heater is using most of the home's power. If there are other loads on the service like an electric range or oven, the problem will be worse.

If the home is new, it may be equipped with a 240 volt, 200 amp service. If that's the case, the heater should be checkd with an ammeter to be sure it is not over-drawing for some reason like under sized wiring, bad connections or contaminated heating electrodes.

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You might have crossover problem caused by bad faucet cartridge.
http://waterheatertimer.org/Crossover.html

The green standby light should come on when 240Volt power is applied. Page 6 manual.
Both red lights should come on when tankless is activated. Page 6 manual

RTE 13 requires 60 amp breaker and 6 gauge wire
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html
http://waterheatertimer.org/pdf/Rheem-TanklessElectricUC_AP15447.pdf

Factory temperature setting is usually default 120 degrees.
Adjust temps page 11 manual
Thermostat calibration is always approximate.
120 degrees is not hot enough to burn the skin.
Exceptionally cold incoming water temperature can cause tankless not to heat enough hot water: install tempering tank to preheat water to room temperature.
Tankless cannot be exposed to more than 11 grains hardness in water. Delime tankless yearly, clean water filter monthly, do not install low-flow restrictions or conserve water since the flow rate must remain high for tankless to activate.
Rheem does not post service manuals for their tankless water heaters.
Call Rheem 800 432-8373

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Hello,For 220volt Choose which side you will connect to.Take the nut off that side black=black / white=red leave the other side alone.The manual is useless.

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I think the only thing powered its the transformer. You connect L1 to Black and white to W and leave the red empty. If it's 120V and you connect L1 to Black and L2 to Red if it's 240V and leave W empty. See attched link to manual, and schematic inside. http://www.raypak.com/uploads/6000.52AG.pdf

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check your power supply there should be two 120 volt lines that will make 240
on your power cord wich is flat you measure from line 1(black) to neutral 2 (white) =120 and 2(white) to 3(red)=120
and from 1(black) to 3(red) =240 volts ac
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