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Wabastco ?
on circulation pump 24 volt which wire is hot ? Black or Brown. To confuse me the rest of our prevost 24 volt system is black ground. German engineering uses brown as ground. Sometimes my head hurts! I know I can check flow but in this case would be better to know in advance. Just a little hard to get system open to ckeck at this point. Thanks in advance bob.
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4 Replies
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Robert,
The A-plug on the Webasto Control Unit powers the circulating pump. The spade blade that is in line with all the other spade blades is the positive (+) and the blade that is 90 degrees to the other blades is the negative (-).
I have a jpg file showing this that I can send you, or anyone else interested, if you will e-mail me your address, please.
I do not know what the wire colors for these two wire are. I agree that Webasto uses brown for ground on the Aqua Hot heaters which do not have a A-plug connected.
jrlegett at gmail dot com
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no a plug connect on this one. just two straight pins. Using webasco pump on a custom hvac system I have built. Going to bite bullit and wire br to ground and check flow. Dummy me should have done this in first place. That is what happens when you think outside box!! Yes I am labeling results as I go so I won’t have to rely on aging memory. Thanks! you have helped with the reasoning process.I have the diagram for 24 V system but it didn’t show anything past relay for pump. The wire is red. Bob
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Bob,
Wish I was there to see your situation for the learning I would receive.
The circulating pump has to be commanded ON by something. Normally the control unit via the A-plug does that. Prehaps the 24 vdc coming from the A-plug is used as a signal to a relay to run the pump. Will be interested to hear what you find. All the best.
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brown is ground= correct rotation. Wire are also tatoo now! Bob
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