Makeit go Right
16-04-2009, 07:00 PM
A customer has a 3.5kW Fujitsu R22 system (not sure of exact model) and wants it replaced with a quieter system (bedroom application).
The interconnecting pipework is concealed behind expensive cornices and plastered/papered walls etc and they are looking for a solution that can reuse the old R22 pipework, rather than having to refurbish 2-3 rooms.
a) The existing pipework sizes need checking for wall thickness: I believe I need a minimum of 0.8mm wall thickness for R410a gas, up to ¾-inch dia pipes. How would one normally measure the existing? With a calliper thingy? ie compare inside dia and outside dia, or just measure wall thickness. Any other practicals ways to do this?
b) Also need to confirm existing pipe diameters and make sure manufacturer is happy if they are slightly wrong-sized. (The run is about 9m.)
c) The existing system works so it could be pumped down after running for 30mins or so to get rid of most of the oil. And if other cleaning is required, that could be done too, of course.
Therefore, I am looking for a very quiet 3.5kW system, ideally one that the manufacturer is receptive on reusing R22 pipework.
So, “Mirror mirror, on the wall, who is the quietest of them all?”
I checked with Daikin kit re reuse of R22 pipewk and they can only offer RZQ solutions (7kW and upwards) and, anyway, their small units are not so quiet.
I am presently searching Mitsubishi, Panasonic, and Hitachi…….thought I’d check if anyone has been down this road already?
Which models, what tips?
The interconnecting pipework is concealed behind expensive cornices and plastered/papered walls etc and they are looking for a solution that can reuse the old R22 pipework, rather than having to refurbish 2-3 rooms.
a) The existing pipework sizes need checking for wall thickness: I believe I need a minimum of 0.8mm wall thickness for R410a gas, up to ¾-inch dia pipes. How would one normally measure the existing? With a calliper thingy? ie compare inside dia and outside dia, or just measure wall thickness. Any other practicals ways to do this?
b) Also need to confirm existing pipe diameters and make sure manufacturer is happy if they are slightly wrong-sized. (The run is about 9m.)
c) The existing system works so it could be pumped down after running for 30mins or so to get rid of most of the oil. And if other cleaning is required, that could be done too, of course.
Therefore, I am looking for a very quiet 3.5kW system, ideally one that the manufacturer is receptive on reusing R22 pipework.
So, “Mirror mirror, on the wall, who is the quietest of them all?”
I checked with Daikin kit re reuse of R22 pipewk and they can only offer RZQ solutions (7kW and upwards) and, anyway, their small units are not so quiet.
I am presently searching Mitsubishi, Panasonic, and Hitachi…….thought I’d check if anyone has been down this road already?
Which models, what tips?