Description
The Tjernlund Products MAC4E is a Multi-Unit Appliance Interlock Control engineered to coordinate the safe, simultaneous operation of up to four heating or combustion appliances. Designed for commercial and residential HVAC applications where multiple appliances share a common venting system, the MAC4E ensures that each connected unit operates only when proper draft and ventilation conditions are confirmed — helping to prevent backdrafting and supporting code-compliant installations.
Key Features
- Supports interlock control for up to 4 appliance units
- Designed for use with Tjernlund draft inducers and power venters
- Helps prevent backdrafting in shared or common-vent systems
- Promotes safe, coordinated appliance startup sequencing
- Supports code-compliant multi-unit venting installations
- Compact control design for straightforward field installation
Application
The MAC4E is ideal for multi-appliance mechanical rooms where boilers, furnaces, or water heaters share a common venting arrangement. By interlocking each appliance with the draft-proving system, the control helps ensure that no unit fires until safe venting conditions are established — protecting equipment, occupants, and the integrity of the overall system.
Why Choose Tjernlund Products
Tjernlund Products is a trusted name in draft control and power venting solutions, with decades of experience providing reliable accessories for residential and commercial HVAC systems. The MAC4E reflects that commitment to safety, quality, and ease of installation.
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