Air Source Heat Pumps

paceinternet

Care to share the coil cleaner products with us, with and without flush?
Maybe moneysaving opportunities for others.

richardc1983

What do you mean? What is it you need to know?

paceinternet

"spraying solvent & flush"
"it doesnt need rinsing"

What products are the service people using to clean the coil?
Sometimes they wash them off with water, sometimes they don't. So which products are good and could save you some money if you did it yourself?

richardc1983

Will have a look what it says in the bottle and report back!

stevehead

Here were the Swedish Testing and Research Institute's findings. they test at 7C, 2C, -7C and -15C
http://www.swedishenergyagency.se/WEB/STEMFe01e.nsf/V_Media00/C12570D10037720FC12574E5003D72B1/$file/luftluft.pdf

Google Translation does a pretty good job of Swedish - English.

richardc1983

Had my units serviced today,

He stripped the covers, sprayed the coils, cleaned filters and fans and any other build up of dust then put it back together.

Didnt need to rinse due to no rinse formula.

Sorted till summer season!

THe 3rd unit into the back room now complete this is connected to the multi split that runs my other 2 indoor units.

Only problem I have come across now is that due to constant refrigerant circulation on units that are thermostat off (eev valve remains open approx 10%) this is still enough refrigerant to raise the coil temp above 40C so that the fan comes on to clear heat from the coil, this is raising the temp in rooms that dont need the heat, meaning the back room which is the coldest room of them all could do with that heat is taking longer to warm up!

HMMMMM.....

stevehead

Looks like cleaning is deff a DIY job - I wasn't privy to the actual chemicals they used, but I'm sure any aluminium friendly cleaner - like the ones for cleaning engines - would do the trick.

While my engineers were here they pointed me to these new Hitachi's with a COP of 6.36!!
http://www.hitachiaircon.com/argws/files/attachment/SalesManuals/S-Series%20Wall%20Mounted.pdf

richardc1983

Very good link there Steve, technology always improving eh!

I have used kitchen cleaners on my units coils before when I have done them myself, and also the ones with bleach in the spray also very good at cleaning the coils. Just ensure you give them a spray down with clean water after to flush out any reminants of bleach.

Andy_WSM

richardc1983 wrote: »

Only problem I have come across now is that due to constant refrigerant circulation on units that are thermostat off (eev valve remains open approx 10%) this is still enough refrigerant to raise the coil temp above 40C so that the fan comes on to clear heat from the coil, this is raising the temp in rooms that dont need the heat, meaning the back room which is the coldest room of them all could do with that heat is taking longer to warm up!

HMMMMM.....

That sounds like a bit of a problem to me. You have lost some of the control that should be an advantage of such a system - and presumably, some of the efficiency too?

richardc1983

Andy_WSM wrote: »

That sounds like a bit of a problem to me. You have lost some of the control that should be an advantage of such a system - and presumably, some of the efficiency too?

Would say it's same as before but it matters more in that room now that it's heated! Energy use is same.