Four-Zone Switching Relay, 120 VAC

Argo ARM4P Four-Zone Switching Relay – Centralized Control for Hydronic Heating Systems

The Argo ARM4P is a four-zone switching relay panel designed for managing multiple circulator pumps or zone valves in hydronic heating applications. Built for 120VAC input, it provides integrated control for up to four independent zones and is expandable to a total of 15 zones using plug-in zone modules.

This relay panel includes a 30 VA transformer, plug-in cube-style relays, auto-reset electronic fuse protection, and an integrated priority timer. Diagnostic LED indicators and clearly labeled terminals streamline field wiring and troubleshooting.

Core Features

• Four-Zone Capacity: Controls four separate heating zones using circulators or zone valves
• Expansion Support: Expandable to 15 zones with optional add-on modules
• Built-in Transformer: 30 VA transformer provides 24 VAC control voltage to thermostats
• Relay Configuration: Plug-in DPDT relays rated for 1/3 hp operation
• Electronic Protection: Integrated auto-reset fuse minimizes downtime during overload conditions
• Priority Timer: Cycles inactive zones at 30-minute intervals to prevent stagnation and cold spots
• Visual Diagnostics: Zone status lights accessible through the panel cover for service reference

Technical Specifications

• Model: ARM4P
• Voltage Input: 120 VAC
• Control Output: 24 VAC via transformer
• Transformer Rating: 30 VA
• Amperage Rating: 7.2 A
• Load Rating: Supports 1/3 hp per relay output
• Frequency: 60 Hz
• Boiler Delay: 5-second shut-off delay to reduce short cycling

Installation Requirements

The ARM4P is intended for surface-mounted installation in mechanical or utility rooms. All terminal connections for thermostats, circulators, transformers, and boiler interfaces are clearly marked for ease of use. Installation should be completed by licensed HVAC professionals in accordance with all applicable electrical and mechanical codes.

Field Applications

Suitable for residential or light commercial hydronic heating systems, the Argo ARM4P provides centralized zone control while offering expandability and service-friendly features. Its factory-tested board design and plug-in relay configuration reduce field labor and facilitate future system modifications.

Additional Capabilities

• Switchable Zone Priority: Allows assignment of domestic hot water or high-demand zone override
• Replaceable Plug-In Relays: Cube-style relays simplify field service and reduce downtime
• Double-Sided Circuit Board: Enhances durability and signal reliability; 100% factory tested
• Terminal Markings: Includes labeled screw terminals and clamping plates for secure connections

Professional Integration

Designed for use in new installations or retrofit projects, the Argo ARM4P delivers consistent zone performance with electrical protection and expandability features contractors expect. Its configuration supports optimal system sequencing and long-term reliability across multi-zone systems.