Check the listing for details. Aprilaire 6303 Single-Stage 2 or 3-Zone Heat Pump Zone Control Panel. Condition: New. Listed at 133.56 USD. Aprilaire 6303 Single-Stage 2 or 3-Zone Heat Pump Zone Control Panel Manufacturer Part Number: 6303 The Aprilaire 6303 2 or 3Zone Heat Pump Zoned Comfort Control System has been designed to increase comfort in your home and reduce energy costs. It can do this because it provides flexibility for all your zone control needs by offering all the features you demand. The Aprilaire 6303 Comfort Control knows, at any given time, which zones of your home require conditioned air. With this information, the Zoned Comfort Control automatically directs the air to the zones necessary thus increasing the comfort level throughout your home and conditioning only the areas that need it reducing your energy costs. Key Features:2- heating and 1 cooling stageControls high and low balance point from one outdoor temperature senorTime delay override to simplify check out and troubleshootingEmergency Heat mode – Locks out the heat pump for heatingVacation mode – Zone 1 thermostat controls all zones Key Specifications:Heating Stages2Cooling Stages1Number of Zones3Electrical SpecificationInput Voltage Range18 - 30 VMechanical SpecificationDimensions (Inches)9.66 x 8.63 x 1.86Weight1 lbOperating Temperature32 degF to 158 degFRelative Humidity90%, Non-Condensing