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Author Topic: Heat pump compressor not running  (Read 2435 times)
Richard Owen
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« on: December 04, 2008, 10:40:06 AM »

Hm, stumped by this one.

Heat pump didn't come on last night.

I've just been and checked everything. Here is the full SP:


Model: WRB09
Status: On (green LED on controller)
Mode: Heating
Target temperature: 42c
Current temperature: 26c
Error codes: None

Power is supplied to the unit and all the LEDs are lit.
Both circulation pumps are running and there is liquid in the circuits.

Any ideas why the compressor isn't starting?
« Last Edit: December 04, 2008, 11:17:21 AM by Richard Owen » Logged

44 Yingli 230Wp panels feeding into 2x Solar Edge SE5000 inverters.
20x 58mm SE, 20x 58mm SW, Solar Thermal feeding 320l thermal store.
10kW heat pump.
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Billy
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« Reply #1 on: December 04, 2008, 10:54:48 AM »

Just noticed the date, public holiday in China, where was pump made? Grin Grin
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Ted
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« Reply #2 on: December 04, 2008, 11:23:37 AM »

Do you have a separate UFH circulation pump? If so usually these are wired back to the HP control board so that if the circ. pump fails (or is otherwise powered off) then the main heat pump won't come on either.
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Richard Owen
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« Reply #3 on: December 04, 2008, 11:28:04 AM »

Do you have a separate UFH circulation pump? If so usually these are wired back to the HP control board so that if the circ. pump fails (or is otherwise powered off) then the main heat pump won't come on either.

I have lots of pumps, but the system is 'compartmentalised'. The control systems are independent of each other. The heat pump has no 'knowledge' of other parts of the system. I use the return temperature and a timer to control the operation of the pump.

Your WRB09 isn't the most sophisticated of beasts.

So, I don't think it can be effected by any other part of the system.

More thoughts please!
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44 Yingli 230Wp panels feeding into 2x Solar Edge SE5000 inverters.
20x 58mm SE, 20x 58mm SW, Solar Thermal feeding 320l thermal store.
10kW heat pump.
300W of Hydro Power.
guydewdney
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« Reply #4 on: December 04, 2008, 11:30:36 AM »

is the main power relay clicking? has the timer (internal one that only fires it up after x seconds) failed?
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Ivan
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« Reply #5 on: December 05, 2008, 12:04:27 AM »

Is the compressor unusually cold? The compressor has a fail-safe to stop it starting in cold conditions to prevent it from icing and snapping something. I think the manual recommends that it is on for at least two hours before it is started up. Has it been powered-down for a period of time? There's a heater band on the compressor, which protects the compressor by warming it, as necessary - perhaps that isn't working for some reason?
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Richard Owen
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« Reply #6 on: December 05, 2008, 08:14:03 AM »

Thanks for the replies chaps.

Problem sorted.

In turning the pump on and off at the controller to see which pumps and relays were firing, I noticed that the band heater round the compressor wasn't warm.

I couldn't find out where to reset it (as the temp probe was working because if I held it between my fingers I could here the relay clicking.)

So, I turned everything off for a couple of hours to let everything reset.

When I turned it back on, everything worked again.

Thanks for all the help.
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44 Yingli 230Wp panels feeding into 2x Solar Edge SE5000 inverters.
20x 58mm SE, 20x 58mm SW, Solar Thermal feeding 320l thermal store.
10kW heat pump.
300W of Hydro Power.
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