Blocked plate

[JamesyGoosey1]

Can someone remind me what dt we should be looking for across a plate heat exchanger flow and return (to determine if it's blocked ) can't remeber for the life of me thanks

 

[lame plumber]

well you'll not be getting any hot water out your tap for starters

 

[gassafe]

Normally flow & return get untouchable hot, the boilers cuts out etc... Water at tap is got cold hot because of this etc... Not sure of exact temperature differentials!

 

[JamesyGoosey1]

I seem to remeber 15 -20 degrees is fine any thing above 20 shows signs of restriction but wanted confirmation that was all