Wire Pump to Diverter Valve ‘Brown’ or use a relay?

[Weezy]

Iv wired in lots of regular Y & S plan heating systems with the regular one pump. However this job i’m going to tomorrow (not seen it yet) has 4 Heating Zones and 1 Hot water Zone, the plumber said i need to ensure when one zone runs it doesn’t back feed and cause another zones pump to run, he said i probably need relays.

Normally the pump is wired onto the orange of the diverter valve along with the boiler switch wire, however i thought if i wired each zones pump onto the corresponding zones Brown wire of the diverter valve there’s no way one zone could power another zones pump.

Is there anything wrong with doing this? I can’t see any reason why this would be a problem and it means i don’t need relays.

(plumber says the boiler is capable of running all zones at once)

 

[Resu]

Only issue I can think of is that the pump will be pushing on the valve for a few seconds until it opens up fully.

 

[Dave OCD]

I've done this before and there were no issues, the valve opens up pretty quickly so I don't think it'll do the respective pump any harm.

 

[cliffed]

Why not use the orange & grey in parallel with the valves as norm.. sorry you have more than 1 pump…

 

[cliffed]

If you are using the brown of that zone valve what controls that valve.
Usually it’s the room stat.
Will you be using the orange & grey in that situation

 

[brianmoooore]

Heating pump is centrifugal, so takes LESS power pumping into a closed pipe than an open one, also, there should be some kind of pressure operated bypass valve between pump and valve, so that argument isn't relevant anyway.
Pump from the brown is the way to go. Don't take electrical advice from plumbers.

 

[cliffed]

If you are using the brown of that zone valve what controls that valve.
Usually it’s the room stat.
Will you be using the orange & grey in that situation

Got where your coming from now…Stat controls valve & pump, use the valve switch connected to the orange & grey for boiler signals Ls Lr…

 

[RedTed]

Iv wired in lots of regular Y & S plan heating systems with the regular one pump. However this job i’m going to tomorrow (not seen it yet) has 4 Heating Zones and 1 Hot water Zone, the plumber said i need to ensure when one zone runs it doesn’t back feed and cause another zones pump to run, he said i probably need relays.

Normally the pump is wired onto the orange of the diverter valve along with the boiler switch wire, however i thought if i wired each zones pump onto the corresponding zones Brown wire of the diverter valve there’s no way one zone could power another zones pump.

Is there anything wrong with doing this? I can’t see any reason why this would be a problem and it means i don’t need relays.

(plumber says the boiler is capable of running all zones at once)

How did you overcome this? I’ve been exact same scenario, 4 valves, 2 pumps, pump shares 2 valves. Plumber says pump on and only one valve. How do you split the valves so they don’t open together on the brown?

 

[RedTed]

Iv wired in lots of regular Y & S plan heating systems with the regular one pump. However this job i’m going to tomorrow (not seen it yet) has 4 Heating Zones and 1 Hot water Zone, the plumber said i need to ensure when one zone runs it doesn’t back feed and cause another zones pump to run, he said i probably need relays.

Normally the pump is wired onto the orange of the diverter valve along with the boiler switch wire, however i thought if i wired each zones pump onto the corresponding zones Brown wire of the diverter valve there’s no way one zone could power another zones pump.

Is there anything wrong with doing this? I can’t see any reason why this would be a problem and it means i don’t need relays.

(plumber says the boiler is capable of running all zones at once)

How did you overcome this? Have exact same scenario but can’t figure how to have zone valves not open with the other and have pump independent? He mentioned relays but I’ve never wired a relay so can’t figure how it’ll work.