Motorised Valve's for Combi Central Heating System

by **sham** » Thu Dec 10, 2009 10:48 pm

need answers to the following questions.
1) When replacing a two port unit does the whole central heating system need to be drained.
2) Any-way to isolate before removing
3) Any benefit of using scale inhibitor products when there is a magnaclean on the system

by **rosebery** » Thu Dec 10, 2009 11:44 pm

"1) When replacing a two port unit does the whole central heating system need to be drained."

No just below the level of the valve.

"2) Any-way to isolate before removing"

Drain below the level of the valve.

"3) Any benefit of using scale inhibitor products when there is a magnaclean on the system"

Different animals - do different jobs. So the answer is yes.

Cheers