Our Brivis ducted heater/air condition system has two zones. With the air con on one zone works OK. Swap to the other zone and initially the air con works but after 15 minutes or so the air flow from the ducts hardly flows, the air that is flowing from the ducts is no longer cold and leaving the air con on causes the big copper pipe outside the house to form ice. Any ideas what could be the problem?
Can the air get from that zone back to the return? (You do know where the return is fitted, don't you?) Despite having more than one zone where cool air is sent, all A/Cs I've ever seen have only single return. You might need to put a vent panel into the door that divides the two zones.
Clifford Heath.
Clifford, Thank you for your reply. Yes air does go through the return, initially, but then as there is a drop in air coming out of the ducts there is also hardly any air flowing to the return. I have now noticed that it is also happening with the heater the same zone initially works and then after around 15 minutes it hardly works.
Perhaps the return air duct is crushed and collapses under the vacuum?
We recently had a problem with one of our split system units where it would hardly produce any cooling or heating. Upon inspection we noticed one of the copper pipes connecting the outdoor to the indoor unit had ice on it (where it exits the outdoor unit). The problem in this case was low refrigerant caused by a small leak in one of the fittings. The leak was fixed, the refrigerant replaced and it now operates as it should both heating and cooling (and no ice on the pipes). Maybe your iced-up pipe is a sign of low refrigerant?
Andy
Does not make sense in this case because one of the zones is working. If the refrigerant was low, which is common to both zones, none of the zones were working.
Richard
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