Hello, we are mid install with a 14kw Therma V currently just running the UFH to stop the house freezing up.

 

Upstairs rads and some relays for the 3 port valve needed to fully commission it.

 

 

The issue we have is with icing... there isn't a manual defrost option and I'm wondering if it's been set up correctly.

 

 

So much ice on it we can't even see the fins at the back and the fans are starting to touch the frost on the inside.

 

Plumber who fitted it doesn't touch the internals and the supplier won't come out until the whole system is finished.

 

 

Is there a way of running the defrost function manually? I read online that there is an electric heating option to speed defrost but I can't see the option to adjust it on the settings....

 

Other than a bucket if warm water I'm running out of ideas!

 

Are there Dip switches to turn on the defrost option? 

 

 



 



 

 

Edited December 15, 20223 yr by Chris g
Spacing

No that is not going to work like that.

 

Contact LG directly. Don't say anything about install not finished, just say it is a new system just being started for the first time now, and it clearly is not defrosting as it should.  Your supplier should also take the same view, shame you mentioned to him that the install was not finished as typical today everyone is looking for an easy get out clause to not address the problem.

 

This is not something you can turn on or off or do manually so if it is not working it must be a fault.

 

With it turned off you could try defrosting with warm water but unless the air temperature is now above zero, the water left on the evaporator will just freeze again.

How much system water volume do you have at the moment, actually open to the heat pump, do you have a buffer?  If there enough volume of water to allow the unit to defrost?

 

Compare that to the minimum install requirements, before you talk with them as they may ask.  If you answer incorrectly you risk voiding any warranty.

I am surprised it carries on running having failed to defrost.  That makes me thing it does not even know it needs to defrost?  Sensor failure or miss placed?

It probably doesn't have a differential pressure sensor so will defrost on pre set logic rather than by need.

 

Lack of open system volume sounds likely