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navien and odr? (12 Posts)
navien and odr?Hi,customer wanted Navien Combi ch 240. We installed boiler as per manufacturers specs,primary/secondary,sch80 on exhaust,etc.
So the boiler has been running for a couple of weeks now and customer is very happy which is great.I asked a heating consultant I know to come and calibrate the boiler and test for efficiency.
By the way there is two heating zones with a taco switching relay and room thermostats.
Boiler was running at 83% eff.it condensed a little on fire up but after a few minutes it stopped condensing.So we installed ODR.Now boiler wont fire.
We call tech support.It appears you cant use the odr if you are using two zones .We are told that the remote control that comes with boiler has to be used as the room thermostat and then the odr will work as long as you have only one zone.
I went to a Navien class and this was never mentioned,we were actually told to put the remote inside boiler away from the homeowner.
I am not here to knock Navien,I would just like to know if anyone has had a similar experience or is there a way to correct the problem because right now I do not have a condensing boiler.
Makes No SenseThere is a TT connection at the boiler. It's nothing more then a switch to tell the boiler I need heat or I don't need heat. Should have no bearing what so ever with outdoor reset.
I would think you'd just set the programming to 24hr clock for heating, set your K-Factor, stick it in the cabinet, end switch from zone control to 'TT" on the unit and away you go.
http://www.navienamerica.com/__DATA/ProductDocument/2013/4/3/_Navien%20CH-ASME%20Installation%20Manual_20130404.pdf."The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."This post was edited by an admin on April 25, 2013 9:32 PM.
I was disappointed alsoI did not realize this fact until after the install. Hopefully they correct this in the next version coming soon.
odrI know it doesnt make sense Chris.From what I am gathering from Navien (you get a different answer from tech support every time you call)the only way odr will work is by using the remote control as room stat,and this will only work on one zone.You can use odr but only on a single zone system.I am not knocking the product for what it costs it is great.I would just love to see it condensing a bit more.I am trying to get a rep to come to my job and correct the situation,obviously it is very possible I am doing something wrong.
Runs ODR with separate zones just fineWe have separate stats and the outdoor temp sensor and things work great.
odri dont understand why a tech support manager said it wont work on more than one zone if not using the remote.What temps is your boiler running at and did you measure the efficiency of the boiler.Without the odr the boiler i installed runs great it just goes to 180 etc.I have a navien rep coming this week so hopefully he can figure it out.I must say they do have a good support team behind them.
I don't know this boilerBut it seems that you can make this zone just fine even if it doesn't support both a heat demand input and the indoor feedback unit, just as long as you place the indoor feedback unit in your "most difficult" zone. This will then be the only thing that drives your system demand, and thermostats in other zones will only open zone valves for their zone without any feedback to the system. This is the same way TRVs are usually employed - since they don't have any end switches on them. :-)
Use the remoteSounds to me like you unplugged the Navien remote?
A DIP switch disables the navien remote as the room stat allowing a different input such as end switches or a aftermarket thermostat to be connected to R &W on the term strip. However the Navien remote must stay installed and plugged in as its the means of setting and controlling the ODR. If the remote is not plugged in to board, how do you expect to select and set the outdoor reset curve? This is done on the remote in place of a supply or return water temp setting.
Most installations leave it mounted close to the boiler. It will now be the means of dialing the domestic water temp, overriding the board settings.
It's quite simple to do and use.This post was edited by an admin on April 27, 2013 12:11 PM.
remoteI have in the past used this boiler with odr.This is why im boggled.Remote is plugged in.Boiler was runnig for 2 weeks.Went to install odr.boiler wont fire.we are told from navien,remote must be used as room stat in order for odr to work.one remote equals one zone.i used circs on this install and not zone valves.as i said i have rep coming this week so hopefully they can address the issue.Thanks for your input.
How mine is setupWe have the dip switches set to use external thermostats on ours. Have control unit mounted right beside our boiler and always keep on. Installed the thermo-resister outside and plugged into two wire cable for unit. Set the K-Curve based on the formula Navien customer support provided, which is not in the manual for some strange reason. Was pretty straightforward. Entire process took about 15-20 minutes for us.
On a side note, there are different resistances available on the sensors. Did you get the correct resistance sensor?
Do you have the dip switches set correctly?
As soon as the sensor was plugged in, the unit did its thing. If I can do it, anyone can.
Good luck with yours.
warmweather shut downA senior tech from California emailed and said you must use remote control as room stat when using odr.I did what you did homeowner and all is well,unit runs like a champ.Only problem is you cant raise wwsd past 65 degrees to test.Unit is in 3 months and havent had a call back yet,Thanks
Just now?That's what I posted back on April 27th
But it's not the indoor stat, just a means of setting the curve, as long as DIP switch 3 of 8 is up (on). A external input on R & W is then the call for heat.
.This post was edited by an admin on June 3, 2013 10:32 AM.