I have a Hunter B01 thermostat. It works fine, but I am a tinkerer and I want to rebuild the circuit so that heat and cool both will operate according to the ambient temperature without having to move the switch from heat to cool. I have a 4-wire heat/cool system. Can the B01 be reconfigured to operate in a heat/cool mode without the need for a switch?

SOURCE: Hunter 44630 thermostat

Here is a link that will have wiring diagram it is for a similar model hunter. Also check your dip switch on the back of the stat to ensure it is set for gas (HG) or electric heat (HE) depending on your type of unit. Good Luck. Rule of thumb for most four wire systems is RED (power to stat) Yellow (Cooling) Green (Fan) White (heat)

SOURCE: hunter thermostat

you shouldnt have to.

SOURCE: MY HEAT PUMP SYSTEM WILL NOT WORK IN EMERGENCY MODE

the thermostat sub base has a place to connect a wire usually white to energize the heat strips when you push the stat way hotter than the house temp. that is why the strips come on in normal heat. it also has a terminal that is only energized in emergency heat and it also should have a wire connected to it so that terminal can supply power to the strips when the stat is switched into emerg heat . you can identify the terminal from the wiring diagram and if need be jumper w2 wire over to the aux terminal and it will work. they both go back into the airhandler and power the same strips. w2..................................................................................................w2 in airhandler to strips or w2...jumper to aux......................................................................................................................w2 in airhandler to strips.

SOURCE: Wiring Hunter Thermostat to 6 wire Carrier fa4bnf036

you probably purchased a 4 wire thermostat which we call heat/cool you stated you have 6 wires which signifies a heat pump you have to purcahase a heat pump thermostat and then write down the color of the wires to there related spots example...yellowe-y red-r white- w and so forth also before you do this kill the power the voltage typical for residential is only 24v's but if the wires touch you could blow a fuse

SOURCE: I replaced my Janitrol 7

There should be electric heat strips in the airhandler.

They automatically come on when the unit goes into defrost, the thermostat is turned up more than 7 degrees over the indoor temp or if the outdoor temp is just so cold the HP cannot keep up.

Tat is your auxillary or emergency heat.

What does the new t-stats installers booklet say that the 0170 function and #2 #7 options are for?

If it is for gas vs elec heat then set it on the elec option.

The difference is that in gas heat systems the blower comes on a few min AFTER the furnace fires up to allow the heat exchanger to get hot.
In an electric furnace the blower has to come on emediatly because the heat strips get hot emediatly and if the blower is delayed the system will shut of in high temp overload.