View Full Version : Need a correctly sized valve

26-10-2005, 06:27 PM
I mated a Prestcold Condensing Unit
Model Number PR500/A0089-12-BS

to a 20 kw evaporator, and wrongly specified a size 6 orifice for the Danfoss ext equalised expansion valve.

The valve is overfeeding...............sending liquid all the way down the suction line, all 10 metres of it.

I have turned the valve in and to try and reduce flow through the valve, but not having much effect, now Ive got a clump of ice around the valve body itself.

I need to replace the size 6 orifice with the correct one. Would anyone be able to help tell me the size of orifice I need.

I dont have a data sheet on the capacity of this condensing unit. All I can say is I am using it for a freezer application and using refrigerant R22.


26-10-2005, 07:53 PM
A rough estimate Aiyub: a PR500 is a 5 HP and gives +/-
5 kW at -30C, orifice 04.

A 5HP gives at -10C +/- 10 kW (double the HP for the kW's)

26-10-2005, 08:42 PM
Thanks Peter

Ill fit a number 4 orifice tomorrow