Ämne: Nibe 1255 English

[Sanntos]

Standard är 230V, 50 hz, Ungern har det med

[Carl N]

in Hungary?

Sorry, missed that.  Skämspådig

I don't think it's possible to connect to the heat pump using the CAT5 cable in another way then via uplink.
But there are other ways to remote control the heat pump, you can use SMS 40 or MODBUS 40.
With SMS 40 you can also use an android app in your smartphone to control the heat pump.

[luk2011]

230V 50Hz it's standard, but it's available three phase 400V , ground and neutral also.
I didn't buy it yet, but i wish to buy Nibe 1245 6kw or 8kw  from  Sweden , because in my country the price of heat pump it's allmost double than in Sweden .
And even if i travelling to Malmo, and i'll calculate the travel costs, will be more cheaper than to buy it from my country .
Just i need to find some on-line store, from where i can personally pick-up .

Maybe i need to buy Nibe 1245 in my own risk, so if i'll buy it, i'll have warranty just in Sweden, and if i'll have ( i hope not ), any deffect to heat pump, i'll can't going back to Sweden to repair it .

Can i ask you guys, what's the most often problems/defect with Nibe 1245 ?
It's worth to buy this modell, it's not worth ?
Can i risk it ?
I can hope, than in 3 years i'll don't have any problem with heat pump ?
The heat pump it have more modules, and i can change it me to ( if i get a change module ) ?
What will happens, if the power will have a high peak voltage ?
I think the heat pump it have some protection for this problem .
What you can tell me about reliability of Nibe 1245 ?
The scroll compressor it's good ? I'll don't have problems with compressor ?

Please, don't judge me if i asking newbie question, but i didn't have any heat pump in my life .
Until last summer i didn't hear about heat pumps, and specially about Nibe .

The only one person from my town who have a heat pump, it's a guy who have a Nibe 1226 11kw model, and he buy it personally from Sweden also .

What you can say about Nibe 1245 6kw and Vaillant Geotherm Exclusiv vws 63/3.

This modell from Vaillant it have cooling function also, not just heating .

But what about comparation with Viessmann 333G ?

How can i use it Nibe 1245 for cooling also ? Wall cooling  . Ceiling floor cooling etc ?
I need some extra module for cooling ? How much it will cost that cooling module ?

Can i use somehow Nibe 1245 in combination with ventilation system : Hoval Homevent RS 250 ?

thank you

luk

[Carl N]

Hi!
1245 is rather new, I havn't seen so many problemt with it yet.
If the price is doubled in Hungary, I would say it's worth to take the risk to import it.
A high peak voltage is never good, but i don't thing the heat pump is more sensitive than other electrical equipments.

I think the heat pump have a piston compressor, but if you adjust the heat pump properly (we can ) the compressor should not be any problem, problems occurs mostly when the heat pump have to high temperature curve and the heat is controlled by the thermostats on the radiators (this is not good for the heat pump).

I don't know anything about Vaillant, but I have heard that Viessmann heat pump is as good as Nibe.

If you want to connect a heat pump to an FTX ventilation system you must buy a waterborne duct heater, but I think it's not worth it.

1245 don't have active cooling, and it's not efficient to have passive cooling with geothermal ground heat.

(I have passive cooling with geothermal "bedrock" heat, a drilled hole).

[luk2011]

I wish to use it with underfloor heating, and not with radiators .
http://www.lksystems.se/en/LK-Systems-Sverige/Floor-Heating/FAQ-Under-Floor-Heating
It's not a good ideea to can setup the temperature in every room separately ?
But if i'll have wall heating pipes, i can't use the Nibe 1245 6kw for passive cooling ?
What means must to correct setup the heat curve ?
I need to setup the spread ( temp difference between brine out and brine in ), to have the highest brine temperature and COP ?
I wish to use the Nibe 1245 6kw with trench collector ( slinky loops ) .

[Carl N]

Well, the best way to setup the heating is to adjust the basic flow on each loop at the underfloor heating so you get correct temperature in every room + adjust the temperature curve on the heat pump.
When you have found the right temperature curve you can use the thermostats to avoid over temperature in any room.
The right curve on the heat pump is the one that give correct temperature inside at any outdoor temperature without any thermostat choking the flow, to low flow over the heat pump is not good for it.
This can take some time and requires some effort to get it right, but the result is that the heat pump is running really cheap and you aviod unnecessary wear.

The flow on the collector side is usually not any problem if you connecting the loops in parallel.

[luk2011]

http://www.nibe.eu/nibedocuments/13955/231611-3.pdf
page #78 heating medium : Max external avail. press at nom flow 67 kPa

for 0.13 L/s, which means 468 L/h, and this would be a spread of 6070/1.16/468 = 11.18°C

http://www.nibeonline.com/pdf/Datenblatt_CH_F1245-6.pdf
Nominelle Durchflussmenge 0.13 l/s, 0.47 m3/h
max. verfügb. ext. Druck 46 kPa

=================================================

http://www.nibeonline.com/pdf/Datenblatt_CH_F1245-6.pdf
In lower right diagram that we have an external pressure of about 20kPa = 200mbar at 0.3 L/s and 80% power.


http://www.nibe.eu/nibedocuments/13955/231611-3.pdf
In this document, at page #32 , for 0.3l/s we have 30kPa = 300mbar .

So, it's a little strange which document it's the right one .

==========================================================

The question it's, which it's the correct values of pressure loss in heating medium side of Nibe 1245 6kw ?
Above, you can see 2 different values of pressure loss in heating medium side, for the same heat pump ( Nibe 1245 6kw )

What's wrong ? What's the correct document ?
The above 2 documents have totally different diagrams . Just look it the pressure loss for 0.3l/s in heating medium side .

I can disable from Nibe 1245 6kw menu, the heater rod ? I can taking OFF the heater rod ?

thank you

luk