Argo 1 Zone Expansion Module - Arm Switching Relay

A. The Argo AD-1 is an add-on module that expands a compatible Argo ARM switching relay control by one additional heating zone.

It allows an existing hydronic zoning control to accommodate another thermostat-controlled circulator, zone valve, or relay without replacing the entire ARM control panel. Argo describes its AD expansion modules as an economical way to add zones to compatible ARM controls.

The AD-1 is commonly used when a boiler system is being extended to serve a new room, addition, indirect water heater, or other separately controlled heating area.

A. No. The Argo AD-1 is an expansion module designed to operate with a compatible Argo ARM switching relay control.

It does not replace the main ARM control panel. Instead, it connects to the expansion interface of the existing controller and adds one thermostat-controlled zone.

Before ordering, confirm that the installed Argo control supports AD-series expansion modules and that an expansion connection is available.

A. The Argo AD-1 is intended for use with compatible expandable controls in the Argo ARM switching relay series.

Argo’s installation documentation covers the AD-1 alongside the ARM-2P, ARM-3P, ARM-4P, and ARM-6P switching relay controls. The exact installation arrangement depends on the existing control, system wiring, and available expansion capacity.

Verify the model number of the installed ARM control before purchasing the expansion module.

A. The Argo AD-1 adds one heating zone to a compatible Argo ARM switching relay system.

That additional zone can receive a call for heat from its own thermostat and control the connected hydronic heating equipment according to the system’s wiring configuration.

For projects requiring several additional zones, Argo also offers other expansion options, including the four-zone AD-4 module.

A. The Argo AD-1 product specifications identify its thermostat input as SPST.

SPST means single-pole, single-throw, which is the basic switching arrangement commonly used for two-wire heat-only thermostat calls. When the thermostat closes the circuit, the control recognizes the demand for heat.

Thermostat and control wiring should follow the current Argo installation manual and the requirements of the connected heating system.

A. The Argo AD-1 is rated for a single-phase motor load of up to 1/3 horsepower at 120 volts AC.

This rating is relevant when the added zone controls a compatible hydronic circulator or similar motor load. The connected equipment must remain within the control’s listed electrical ratings.

The Rural Energy product page lists a 1/3-horsepower, 120-volt AC motor rating for the AD-1.

A. Yes. The Argo AD-1 is designed for hydronic zoning applications and may be used with compatible zone valves, relays, or circulator-based controls when properly configured.

The correct application depends on the existing ARM control, the connected load, and the boiler system’s wiring design. The AD-1 should not be selected solely by physical fit; electrical ratings and control compatibility must also be confirmed.

Manufacturer and distributor specifications describe the module as suitable for use with many zone valves or relays.

A. Installation should be completed by a qualified heating or electrical professional familiar with boiler controls and line-voltage wiring.

The module works with thermostat circuits and 120-volt equipment, so incorrect wiring can damage the control, create an electrical hazard, or prevent the heating system from operating properly.

Argo’s installation manual warns of fire, electrical-shock, explosion, and asphyxiation hazards and instructs installers to read the complete instructions before beginning work.

A. Confirm the existing Argo control model, available expansion connection, thermostat type, connected load, voltage, and required number of additional zones.

The AD-1 adds only one zone and is intended for compatible Argo ARM controls. It should not be treated as a universal replacement for every boiler relay or zoning panel.

Also determine whether the required interconnection cable, enclosure hardware, or other installation components are already present or must be ordered separately.

A. The Rural Energy listing is for one Argo AD-1 One-Zone Expansion Module.

The product page identifies model AD-1, one-zone capacity, SPST thermostat current, and a 1/3-horsepower single-phase motor rating at 120 volts AC. The main ARM switching relay, thermostat, circulator, wiring, and other system components are not identified as part of this listing.

Review the current product page and installation documentation before ordering to confirm package contents and system compatibility.