On the existing thermostat you have terminals V, C and F. I think these would correspond to a new thermostat as follows:
Old-------- New
V---------- Rc/Rh
C ----------- Y
F------------ G
To test this, (old thermostat) jump V and F wires, fan should turn on.
Jump V and C wires, compressor should come on. If that works, the old to new connections above should work. You won't hurt anything (or yourself) jumping these wires out. If you are thinking of a programmable stat make sure it's battery operated and doesn't require a Common wire.
Old-------- New
V---------- Rc/Rh
C ----------- Y
F------------ G
To test this, (old thermostat) jump V and F wires, fan should turn on.
Jump V and C wires, compressor should come on. If that works, the old to new connections above should work. You won't hurt anything (or yourself) jumping these wires out. If you are thinking of a programmable stat make sure it's battery operated and doesn't require a Common wire.