Moe,
The relays in the IntelliFlo are made to control relatively low current devices, they are not meant to control the AC current required by a heat pump.
One relay is rated for a max of 16 amps and the other for a max of 5 amps.
In most cases you would wire the heat pump to circuit breaker and just use the IntelliFlo3's relay to control when the heat pump can run or not. Just like the thermostat in your house turns your AC on and off, but it does not directly control the AC going to the Air Conditioning system.
The relays in the IntelliFlo3 can do what you want, but not directly, you'd need to use a contactor. I know nothing about heat pumps, but I assume, just like your house AC, heat pumps have their own internal contactor or relay.
Thanks,
Jim R.