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206007075

Active Member

1

Monday, June 13th 2005, 4:07am

Pump Start Relay

Does anyone know what I should replace a 30A pump start relay with? I have a large water pump, 220. The current relay seems to short the zone when it tries to turn on.. Aren't relays fairly reliable? I image this one to be over 10-20 years old.

Wet_Boots

Supreme Member

Posts: 4,030

Location: Metro NYC

2

Monday, June 13th 2005, 3:06pm

Old relays might draw too much electricity for modern solid-state controllers. You really need a multimeter to measure the electrical resistance and current draw of the present relay.

206007075

Active Member

3

Tuesday, June 14th 2005, 10:26am

just took notes this morning.... the pump is 1 1/2 hp, the relay says 30 amp resistive. The controller is a new solid state. Any recommendation to replace the relay.. and if so w/ what? thanks.....

Wet_Boots

Supreme Member

Posts: 4,030

Location: Metro NYC

4

Tuesday, June 14th 2005, 4:08pm

The simplest solution is to buy an expensive controller, like a Hunter ICC, which can supply more current to operate the relay.

water miser

Senior Member

Posts: 19

Location: USA

5

Sunday, June 26th 2005, 3:25am

has the system worked before?i would replace it with what the manufacturer of the pump suggest.also on the transformer which plugs into the wall has a va rating which stands for volt/amps.thats the maximum amout of volt/amps the 24v side of the system can have.to determine the volt/amps of the system requires some skill with a meter.if the system has worked before,then all of a sudden not worked ,i would ohm out the relay coil and solinoid coils.
when the controller calls for a zone to be on does the pump turn on?if not is there 220v sitting at the pump?my suggestion is to call someone quilified to systematically troubleshoot the system,and not just change parts.i cann't see blindly changing parts out when it's not needed.you could end up spending more money.

Wet_Boots

Supreme Member

Posts: 4,030

Location: Metro NYC

6

Sunday, June 26th 2005, 8:03am

Just because there have been efficiency improvements in valve solenoids, with the result that entry-level solid-state lawn sprinkler controllers now supply much less power than old motorized controllers did, does not mean that there has been any comparable efficiency improvements in power relays. You are pretty much stuck with having to overspend to supply the power needs of the old relay.

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