wire extra pump

[gordy28]

i need to put in extra pump to feed 10 rads, at the moment i have wired back to existing pump, which means whenever the boiler starts the 2nd pump kicks in, i need to wire it into the programer so that when it asks for heat it comes in, i have a landris/ staffa rwb9 programer, can anybody tell me what connections on the programer to wire the pump onto please. thanks graham

 

[Puddle]

Not sure why you need two pumps?, it is bad practice to put two pumps on a system, working against each other, can burn one or tuther out,if water not circulating round system correctly, balance or increase size of pump,vari speed ect

 

[gordy28]

the last rad in system is in the conservatory, when i put the conservatory up i ran microbore under the floor to feed last rad, now it only gets warm, when i connect extra pump just before it gets hot. i have put in a grundfoss 15/60 pump but that dont help. i have it on flow at the moment and it does interfere with 2 other rads so i was going to fit extra pump on return, i have tried to cut flow on other rads to try and balance the system without any luck. so i thought if i put the pump on return it may sort any problems out. but im not a plumber and would welcome any advise, i may not get a chance to change anything untill next weekend because of work, ps i am running on speed 3 on pump

 

[Blake]

If you shut off every rad in the house apart from the conservatory, does it then get hot?

 

[gordy28]

yes it does

 

[tweakyboy]

Have you tried balancing the system properly? Not just by turning off each individual radiator?

 

[Blake]

well that rules out a bent pipe etc on the microbore if it gets hot. Shut off the lock shields on every other rad and then open half a turn. This should restrict the flow sending the heat on to the conservatory rad. If the other rads are not hot enough, open a fraction at a time on the lock shield.

 

[gordy28]

will try that, and post back. thanks

 

[gordy28]

i balanced the rads and they are all nice and hot now except that the 3 rads furthest away from the boiler are 20 degrees f colder at the bottom than the top, these are quite new rads and the system has been cleaned so i dont think its sludge,( this is without the 2nd pump so i wont need that now ), 2 of these rads are on a long 15mm run, would it help if i extend the 22mm run of flow and return and reconnect the 2 rads with a shorter 15mm run