Defrost problem.

[scorpx]

I have a -18 cold room.
Problem is really interesting. when dfrost starting ( evrything stops and just resistanst (4) works. ) resistanst stars to turning in 4 sec stop 20 sec and turn again 20 sec. Why they start turn I realy don't understand. is it posible to magnatic area ?

[sedgy]

scorpx, understand -defrost
not understand -resistant stars to turning in 4 sec stop 20 sec and turn again ?
please repeat

[chemi-cool]

Check the setting on the controller:

what is the defrost stop temp?
Where is the avaporator sensor connected to the fins?

What controller do have?

Details, details, details. Pictures are even better.

The more we know - The more we can help.

[scorpx]

this is the evaporator spect


Surface / Oberflache : 145,3

Capacity / Nenn-Leistung (R 404 A) :38.800 W
Air Flow / Luftmenge : 25.575
Air Throw / Wurfweite : 25

Coil Batterie 13x1650 13x1650 2x1650 4x150 300.0
Evaporation : -8C

[Brian_UK]

It seems that a temperature sensor is too close to the heaters.

Heat comes ON and the sensor opens, heater cools down and sensor closes.

OR

A wire/cable is loose somewhere breaking/making the circuit.

[Sandro Baptista]

What's the end defrost temperature set-point. Put the bulb or probe (depending of type of thermostat you are using) far as possible of heaters on a fin location where is more difficult to defrost.

[scorpx]

I think I counld not explain the main problem. Everything works fine, defrost is work great. problem is when "superheater - resistans - heater - hot plate" (I don't know english meaning of this part. Part that warm and melt the ice ) this part start turning in its own right. Because of that electric wires that connect the that part disconnect.

Thanks for all posts...

[paul_h]

So the defrost heater element turns on by itself even when not on defrost mode?
And because of that you have had to disconnect the wires to it?

[scorpx]

So the defrost heater element turns on mean = spinning , rotate, circleing...

[paul_h]

I would hope a defrost heater element would be firmly attached to the evaporator and stationary!

spinning, circling and rotating is what your car wheels do as you drive down the road.

"turning" is a similar english word to spinning, circling, rotating, true; but "turning on" is really meaning "switching on" when taking about anything electrical.
Sorry to confuse with technically incorrect terminology.

[scorpx]

I would hope a defrost heater element would be firmly attached to the evaporator and stationary!

spinning, circling and rotating is what your car wheels do as you drive down the road.

spinning, circling and rotating is what your car wheels do as you drive down the road. = absolutely Yes

[tonyelian]

hi
i think ur problem came from contactor thermal device set too low&auto
thats mean when the defrost starts the themal protector cuts off when it cools it cut in pls check the def contactor during defrost

[coolhibby1875]

could be a pump down system where defrost contactor only pulls in when unit switches of on the lp switch, check and make sure your solenoid isnt passing!