Heat Pump problem

Postby Paul Pepper » Fri May 11, 2007 6:09 pm

Having a real nightmare with a heat pump. Have installed with 63a MCB on non-RCD side of consumer unit, with properly sized cable running to local isolator above heat pump. Heat pump only requires high ampage during startup (it has a scroll compressor) - normal running is around 20 amps. It contains an backup electrical cassette (3kW) to heat water which is randomly tripping the 63a MCB after between 2-10 mins of operation, and for love nor money I can't understand why!
I'm on the verge of getting a sparky in to have a fiddle (I'm a heating engineer) - just wondered if anyone has an idea what might be causing this?

Many thanks!
Paul Pepper
Posts: 38
Joined: Fri May 11, 2007 6:02 pm


Simply Build It

Postby sparx » Sat May 12, 2007 9:56 am

I would just love to get my hands on this one!!!!
or even a circuit diagram....
If compressor running on steady load to extract heat from ground/air, is back up heater in circuit with a water circulating pump plus flow switch to control cassette? would need clamp on ammeter placed around system to locate cause, no sign of loose connection i suppose, wish could be more help, regards SPARX (South Kent Coast area)
Posts: 2166
Joined: Wed Mar 21, 2007 8:33 pm
Location: The fifth continent.

Postby Paul Pepper » Sat May 12, 2007 12:54 pm

Not actually got compressor up and running yet (ground loop not yet filled with water). Only running system with electrical cassette - hence my confusion! Can't find sight nor sound of a loose connection - cassette has it's own MCB in heat pump tho, so can only assume fault is on supply?

Thanks for any advice!

Paul (S. Lincs)

I'm trying to find a circuit diagram for you - you're interested.

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Paul Pepper
Posts: 38
Joined: Fri May 11, 2007 6:02 pm

Postby Paul Pepper » Sun May 13, 2007 2:29 pm

Found the problem - faulty MCB! Changed it and now it's all working like a charm!
Thanks for advice tho!
Paul Pepper
Posts: 38
Joined: Fri May 11, 2007 6:02 pm

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