Drainage pump question

[Raswes]

Hi guys.i hate asking questions like this one but thats the only way i am learning.
Can failure of an external drainage pump connected to the cooling signal cut power supply to the whole a/c unit ?

[frank]

Raswes

Please do NOT post your question in more than one thread.

You will not get faster replies and you just might upset some members.

One question, one post is sufficient.

Please make sure that you choose the most suitable area to post your question.

[The Viking]

+1
And BTW, the answer is no,not without a relay in-between.

[TimTim]

Yes certain types of condensate pumps, if they are wired correctly, will effectively cut out the operation of unit as a form of protection. The idea is that if the condensate pump fails to expel water, in order to prevent the evaporator leaking water there is a float switch that has a normally closed circuit but when the float reaches maximum height it opens the circuit. The switch cuts the current to the power supply of the unit to prevent more condensate being produced.

[coolments]

[ The switch cuts the current to the power supply of the unit to prevent more condensate being produced. [/quote]

Careful with this, if its a split unit that is mains powered to indoor unit which in turn powers the outdoor then you could end up switching upto 13amps through the pump.....Not Good..!!.

As said before switch through a relay rated at the same size as the units circuit breaker. I personally wouldnt advise any one switching any load at all through condensate pump protection switches as they could get it wrong.

Few more things to note if installing a relay and for some reason the condensate pump has its own power supply.
Make sure the pump and unit run on the same phase, as at if not where you install the relay there is a risk of a 415v electric shock should you fail to isolate power before servicing them, also add stickers or labels indicating that both the unit & condensate pump must be isloted in order for the equipment to be safe to work on.

There are other ways, cassette units already have an overflow prtection switch, find its connections on the PCB and then wire your switch of your pump in series with it in N/O or N/C which ever is required, not only would you get the correct code if the condensate pump fails but it would also stop cooling, works great with VRF units.
Also check the wiring diagrams as many other styles on units ceiling mounted but with no lift pump still have the conection there with a jumper wire on it and will fault out also correctly.

Regards, Coolments.

[Legend01]

Try this

Go to Aspen pumps web site and look for dr bob!

He knows it all!

[Legend01]

Try This Link
Ask Dr Bob! (http://www.aspenpumps.com/downloads/ask_dr_bob.pdf)

[lowcool]

dr bob sounds like a ressurectionist,hes everywhere,hes everywhere