yesterday on a carrier heat pump i had delta t of 12. so i open ahu and see wheather i have a piston or txv. i see txv so i know im charging using sub cooling. i get my fluke temp meter and 2 clamp on thermometers hook up guages and see no sub cooling. i add 3 lb of 22. and get my subcooling to 11 degrees(marked as correct subcooling on odu data plate) and then i notice superheat of about 3 degrees. i know this should be higher if the valve is controlling superheat. im in boonies and cell wont work so cant call boss even if he would pick up on fri evening. i stop charging and can only think the txv is open. for some reason. the valve is closed by spring pressure and the external equaliser. it is opened by bulb pressure. could the bulb be off the suction line or stuck open. what else could cause this.