Io Hvac Controls SC-LLC-200 Lead-lag Controller

Product Description

The IO HVAC CONTROLS SC-LLC-200 is a lead-lag controller designed to sequence multiple HVAC units or compressors in a shared load application. Lead-lag control alternates which unit runs first, balancing runtime hours across equipment and reducing wear on any single unit. The SC-LLC-200 is installed by licensed HVAC technicians in commercial and light commercial systems where two or more parallel units serve a common zone or loop. At 1 pound and a compact 8 x 4 x 10 inch footprint, it fits into standard control panels without consuming excess space.

The SC-LLC-200 is suited for systems where runtime equalization across multiple compressors, pumps, or air handlers is required. Typical installations include rooftop unit arrays, chiller plant staging, or multi-compressor refrigeration systems. The controller manages the automatic switchover of lead and lag designations based on accumulated runtime, keeping equipment loads balanced across the system without manual intervention from the service technician.

Key Features

• Sequences lead and lag units to equalize runtime and reduce single-unit wear
• Compact enclosure at 8 x 4 x 10 inches fits standard control panel installations
• Lightweight construction at 1 pound simplifies panel mounting
• Designed for commercial and light commercial multi-unit HVAC applications

Compatibility

Designed as an OEM-style replacement or upgrade controller for commercial HVAC systems requiring lead-lag sequencing of parallel units or compressors.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with low-voltage control wiring and commercial system staging. Disconnect and lock out all power to the control panel before beginning installation or wiring work. Verify all wiring connections against the system schematic before restoring power. Follow applicable local codes and NEC requirements for control circuit wiring.

Technical Specifications

• Dimensions (W x H x D): 8 x 4 x 10 inches
• Weight: 1 pound

Standard Information

• Brand: IO HVAC CONTROLS
• Manufacturer Part Number: SC-LLC-200