Heat Pump has Ice?

[york_hvac]

Ihave a 2.5 Ton York Heat Pump E1FD030S06 and AHU Model FA4B. Last night, it got down to 64 inside the house, so I tried the heat for the first time and seemed to be working great. When I got home today and took my dog outside (No, he does not "go" on condensors) I went over to the unit to see how it looked and there was ice on the very small copper lines inside the unit. I think these lines were comong from the distributor. Also, there was what I think was water dripping from the line that enters what I belive to be the distributor. The outside air temp was 52 degrees at the time. Is this normal?

Thanks!

-York_Hvac

[speedracer]

Sounds normal, but only a technician right there can check the charge. The big pipe leaving the outdoor unit should be hot when running. The unit has a defrost system to deal with ice buildup on the coil and tubing.