Available April 2026
Model Pro642
6-Zone Panel with Automatic Bypass Control
For Gas/Electric Equipment with 2-Stage Heating and 2-Stage Cooling or
Conventional and Dual Fuel Heat Pump Equipment with 2-Stage Compressors and 2-Stage Auxiliary Heating
Eliminates calibrating and testing Bypass.
On-panel display for entering settings, testing installation and monitoring equipment operation.
Optional on panel 915MHz radio for use with wireless outdoor temperature sensor and wireless thermostats.
A2L leak detection input.
Push-in terminals and plug&play dampers speed up installation and reduce wiring errors.
Superior actuator with twice the torque and 4 times the operating life of a spring return actuator.
Also available as Model Pro642T which includes terminals for 3-wire 24VAC power open/close dampers or spring return dampers.
Compatible Equipment
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Gas/Electric - 2-stage heating and 2-stage cooling.
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Heat Pump with electric strip heating - 2-stage compressor and 2-stage auxiliary heating. O or B-type reversing valve.
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Heat Pumps with dual fuel heating - 2-stage compressor and 2-stage auxiliary heating. O or B-type reversing valve.
Compatible Zone Thermostats
Use a 24VAC gas/electric or heat pump thermostat in Zone1 for emergency heat control. Use any 24VAC gas/electric thermostat in Zones 2 through 6.
Automatic Bypass Control
The zoning panel provides Automatic Bypass Control using an external modulating bypass damper. The panel automatically positions the bypass damper based on the size of the zone dampers, the bypass damper size, and which zones are calling and how much extra CFM is acceptable for the calling zones.
A2L Refrigerant Leak Detection
All dampers are fully opened when a refrigerant leak is detected by the equipment and the equipment 24VAC (R) is turned off or a dedicated leak detection output is activated.
Easy Wiring
Push-In, screwless terminals and plug&play dampers speed up installation and reduce wiring errors.
Plug&Play or Wired Dampers
The Pro642P has connectors for plug&play dampers. The Pro642T has terminals for 3-wire power open/close dampers or spring return dampers.
Model Pro642P
Model Pro642T
On-Panel Display
Use the preset options or set options and display the operation of the equipment including call status, zone thermostat status, zone damper positions, bypass damper position and leaving air temperature.
positioning and less than 1VA when holding position. LEDs indicate when the damper is fully open or closed. Multiple dampers can be used to define a zone. Electronic motor control ensures long operating life - tested to over 9 million cycles. Cables for connecting the damper to the panel are provided with each damper.
Modulating Dampers
Modulating dampers can be positioned in 2% steps by the panel for exact bypass control. The dampers provide twice the torque of a typical spring return damper actuator and use only 2VA when
Selecting Options
Use factory set options or use the keys and LCD display to select the options best suited to the installation.
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Equipment Type.
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Stages of heating and cooling.
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High and low temperature limits.
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Fan operation in gas heating
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Number of zones being used.
Selecting Auto Bypass Options
Use the keys and the LCD display to select the bypass
options and settings.
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Turn automatic bypass control on or off.
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Set the CFM demand for each zone.
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Confirm the zone damper sizes selected by the panel.
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Select the allowed increased CFM for the calling zones.
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Set the external bypass damper size.
