Heat pump fill & flush outside

[LaChab]

I feel rather tempted to add a few bits to one of the outside pipes from the heat pump to make up a fill & flush function. (28x15x28 tees, 15x3/4 service valves, 28 full bore valve)

BUT I haven't seen it on any schematic, they always seem to be indoors, which doesn't seem as convenient.

Ok idea? Bad idea?

Is it likely to be a problem, particularly freezing?

Thanks,

[SimonD]

6 minutes ago, LaChab said:

I feel rather tempted to add a few bits to one of the outside pipes from the heat pump to make up a fill & flush function. (28x15x28 tees, 15x3/4 service valves, 28 full bore valve)

BUT I haven't seen it on any schematic, they always seem to be indoors, which doesn't seem as convenient.

Ok idea? Bad idea?

Is it likely to be a problem, particularly freezing?

Thanks,

There are some installations where installer will put a tee and ball valve off the flow & return outside. They put them before the heat pump isolation valves so you can isolate the heat pump and flush the system through - there are pros and cons to this approach. Just then make sure all the pipework is properly insulated. If you do a fill and flush setup, if you're using mains rather than a pump flushing machine, just make sure you've got easy access to mains water outlet.

[LaChab]

@SimonD Thanks for the observations. Hadn't thought of utilising ing the "normal" valves. I was thinking of using end feed tees rather than a pre-made unit so the insulation would be less disturbed. Outside gives me access to a convenient hosepipe!