Arzel Zoning
When you design a Pro Panel zoning system with a heat pump and emergency heat, you have some options. You never have to use a heat pump thermostat. However, if you want to use a heat pump thermostat to control emergency heat, here's how it works.
The Pro Panel also has built in control for emergency heat mode. So, for dual-fuel or all-electric systems, you’re optionally allowed to wire a heat pump thermostat to Zone 1. And then if that heat pump thermostat is put into emergency heat mode, it’ll put the whole panel into emergency heat mode, making it so only the backup heat runs and it never heats with the heat pump.
Here, it says if the Zone 1 heat pump thermostat energizes W without Y, that puts the panel into emergency heat mode. So, if the thermostat says, “I want the backup heat to run and not the heat pump,” the panel will know to only run the backup heat no matter which zones are calling.
Keep in mind, a heat pump thermostat is never required. Even if you’ve got a heat pump that you’re controlling, or dual-fuel, or all-electric, you can always do that with single-stage conventional thermostats. This is just an optional control that you can give to your customer to control emergency heat from the Zone 1 thermostat.