Trying to plumb nyle therm DHW heat pump

[huffdawg]

Took 5 hours from a cold tank of 52 gallons to 129

 

[huffdawg]

Nice.

Did you figure out your Triangle Tube? I was thinking it must have a drain on it? So you should be able to T your HP-in to that? That should eliminate the short-circuit thing - I would think.

The drain is the cold water in dip tube .. you have to syphon the tank out .. I will use the aux tapping to connect my HP outlet to.

 

[Donl]

Don, there are three wires coming out of the Nyle that were prewired by Tom in Maine . Yellow ,Blue,and Green. The green is not used . the yellow and blue are the 2 legs for 240v . From the panel to the junction box I used 12/2 conductor. I connected both legs to the 12/2 conductor and interrupted one of them with a L6006C honey well aquastat , I used a 15amp 120/240 breaker at the panel.

Do you use a lot of hot water?
A case a beer a month makes for one good party at the end of the year..

We don't use a lot of hot water, there is just the two of us. What we do use is pretty much consistent from day to day.
I have an Efergy energy monitor connect to the dhw circuit. Before installing the nyle we were averaging 10.0kwh's per day. With the Nyle installed we are averaging. 4.8 kwh's a day. That is a 5.2 kwh savings.

5.2 kwh X .186 cents/kwh X. 30 days = $29.01 per month savings. (EDIT) This figure includes hst.


A little over a year to pay for itself, then free beer for life! Not bad at all.

 

[Clarkbug]

Ya I used hepex tubing Clarkbug.. Its the stuff that won't allow oxygen to impregnate through.

But for DHW the oxygen barrier doesnt really matter, since there is fresh water coming in all the time. (Unless you are hooked to the boiler side, in which case ignore my comment....)

 

[huffdawg]

But for DHW the oxygen barrier doesnt really matter, since there is fresh water coming in all the time. (Unless you are hooked to the boiler side, in which case ignore my comment....)

Ya I know, it was just some left over I had laying around

 

[Clarkbug]

Either way, looks good!

 

[tom in maine]

Hooking up a Nyletherm to a non-electric tank is a fairly simple changeover. There are four connections to the unit as it comes from the factory.
Green is ground, it should be connected. The other three original connections are L1 and L2, which are the 240vac feed and "T" which was originally connected
to the lower element. The T connection was a funky design that allowed the use of the lower electric element to control the heat pump.

To operate without that electric water heater control, you need to install a 20k ohm 5 watt resistor between L1 and T. The T feed-in wire is removed from the unit.
You then remove a single wire from L2 that goes to the Bypass switch inside the unit. The unit will now run continuously unless you interrupt the power by installing an aquastat on either L1 or L2 to make on temperature drop. The aquastat is installed on the tank.

If someone is purchasing a Nyletherm, I do this conversion ahead of shipping at no charge. If you need to do it in the field, we can talk you through it. I have a wiring diagram which I can email you.

 

[Donl]

Hooking up a Nyletherm to a non-electric tank is a fairly simple changeover. There are four connections to the unit as it comes from the factory.
Green is ground, it should be connected. The other three original connections are L1 and L2, which are the 240vac feed and "T" which was originally connected
to the lower element. The T connection was a funky design that allowed the use of the lower electric element to control the heat pump.

To operate without that electric water heater control, you need to install a 20k ohm 5 watt resistor between L1 and T. The T feed-in wire is removed from the unit.
You then remove a single wire from L2 that goes to the Bypass switch inside the unit. The unit will now run continuously unless you interrupt the power by installing an aquastat on either L1 or L2 to make on temperature drop. The aquastat is installed on the tank.

If someone is purchasing a Nyletherm, I do this conversion ahead of shipping at no charge. If you need to do it in the field, we can talk you through it. I have a wiring diagram which I can email you.

Thanks Tom for this explanation. I was curious as to how the conversion was done. Now I know.

 

[kopeck]

I did the wiring my self and it was super simple. I also didn't mind doing it as now I have a good feel for how the whole thing works.

I'm still not really sure why a resistor is needed but that's part of the magic that makes it work with an aquastat.

K

 

[huffdawg]

I would like to use this relay to control dhw temp from the nyle heat pump. I know this might be a dumb question. The four terminals on the left are already being used to turn on a circ pump that supplies boiler water to heat the tank,it is 120v. Could I use the terminals on the right to interrupt power to the nyle, it is 240 volt?

 

[tom in maine]

I am not sure that this is the right fit. It appears that this unit is passing power to a device, not just switching. Many aquastats will switch the 3.5amps that the Nyletherm draws without the electric element in the equation, eliminating the need for a relay.

 

[huffdawg]

I am not sure that this is the right fit. It appears that this unit is passing power to a device, not just switching. Many aquastats will switch the 3.5amps that the Nyletherm draws without the electric element in the equation, eliminating the need for a relay.

There isn't a real convenient spot for an aquastat. just thought it might work ,would make installation a lot simpler.

 

[huffdawg]

f

Got the second DHW Heat Pump running .... No burnibg any more wood till Oct.

 

[huffdawg]

funny one unit seems to make a fair bit of condensate and the other doesn't make any .

 

[joecool85]

We don't use a lot of hot water, there is just the two of us. What we do use is pretty much consistent from day to day.
I have an Efergy energy monitor connect to the dhw circuit. Before installing the nyle we were averaging 10.0kwh's per day. With the Nyle installed we are averaging. 4.8 kwh's a day. That is a 5.2 kwh savings.

5.2 kwh X .186 cents/kwh X. 30 days = $29.01 per month savings. (EDIT) This figure includes hst.


A little over a year to pay for itself, then free beer for life! Not bad at all.

How much did you pay for your Nyle?

 

[huffdawg]

Hey Tom , what do you do with the nyle's after they are put out of service for the winter heating season? I assume you shut the supply and discharge then drain the water out, I guess you might call it winterizing.

 

[tom in maine]

I do nothing because I feed one of our tanks directly. Since the innards of the heat pump are all copper. I would not bother to drain it.

The units are $300 plus tax in Maine or shipping elsewhere (+$65 in CONUS).

 

[velvetfoot]

Just thought I'd chime in and say I'm happy with mine. It's charging an electric water heater.

 

[huffdawg]

Yes I am also very happy with the two of mine 5 months no wood consumption by the time Oct comes around. Thank you Tom for the friendly service and all the installation tips.

 

[avc8130]

Wow...anyone done the mental exercise of determining if it is cheaper to keep the Nyletherm running next to the wood boiler extracting the heat given off or if it is cheaper to run the indirect with the wood boiler water heat?

ac

 

[Coal Reaper]

Wow...anyone done the mental exercise of determining if it is cheaper to keep the Nyletherm running next to the wood boiler extracting the heat given off or if it is cheaper to run the indirect with the wood boiler water heat?

ac

that might only make sense if you are running a WG

 

[velvetfoot]

Wow...anyone done the mental exercise of determining if it is cheaper to keep the Nyletherm running next to the wood boiler extracting the heat given off or if it is cheaper to run the indirect with the wood boiler water heat?

ac

I would think if the excess heat from the boiler isn't really needed down there, why not? On the other hand, a lot of non-cheap plumbing I'm putting in now will go to waste.

 

[maple1]

Wow...anyone done the mental exercise of determining if it is cheaper to keep the Nyletherm running next to the wood boiler extracting the heat given off or if it is cheaper to run the indirect with the wood boiler water heat?

ac

If you mean just keep the Nyletherm running all winter beside the boiler, I think I would shut the Nyletherm down in the winter also. It doesn't use much juice relatively speaking, but it's still some juice.

 

[velvetfoot]

If you mean just keep the Nyletherm running all winter beside the boiler, I think I would shut the Nyletherm down in the winter also. It doesn't use much juice relatively speaking, but it's still some juice.

According to this, www.eia.gov/neic/experts/heatcalc.xls , I'm apparently wasting my money on pellets, in general, not just dhw, vs. an aire source heat pump. Oh well, what else is new.

 

[avc8130]

that might only make sense if you are running a WG

Well it clearly wouldn't work for the guys wasting all of their boiler and storage loss outside of their heated envelop...