Help on my ac unit

Question

we are buying a house with a ruud upka-030jas ac unit. we have tried to turn it on. it blows the fan on in the inside of the house but the outside unit does not come on. there is no manual that we have found. is there a special trick or may something be wrong?

alyson capone

model# upka-030jas
serial# 4919 m2293 073