Armstrong 119181-113 Compass R20-75 Dry Rotor Variable Speed Circulator

Need quiet zone circulation at changing system demand? Armstrong 119181-113 Compass R20-75 adjusts through ECM variable-speed control for residential heating, radiant flooring, and hydronic zone systems. Its 120 V single-phase motor delivers up to 20 GPM against a maximum head of 24.6 feet, while Auto, constant-pressure, fixed-speed, and proportional-pressure modes give installers several control options. Purge the loop, verify the flange connection, and select the control mode after the system is filled.

The Armstrong Compass R20-75 uses dry-rotor ECM technology with a cast iron body and standard two-bolt flange connection. Its operating temperature range extends from 36°F to 230°F, supporting many residential heating applications when fluid conditions are compatible. Verified data does not include amp draw, RPM, impeller material, seal type, dimensions, weight, thermal protection, pressure-switch settings, or self-priming capability, so confirm electrical and hydraulic requirements before installation.

Key Features of Armstrong 119181-113 Compass R20-75

- 20 GPM maximum flow for residential heating and zone circulation.
- 24.6-foot maximum head for radiant-floor and hydronic loop design.
- 120 V single-phase motor suits compatible residential electrical service.
- ECM dry-rotor motor supports variable-speed circulation control.
- Auto, constant-pressure, fixed-speed, and proportional-pressure control modes.
- Cast iron body supports closed-loop residential heating applications.
- Standard two-bolt flange connection simplifies compatible pump replacement.
- 36°F to 230°F operating temperature range supports approved hydronic fluids.
- Amperage, RPM, impeller, seal, dimensions, weight, thermal protection, and warranty terms require confirmation.

Why the Armstrong 119181-113 Compass R20-75 Stands Out

This Armstrong variable-speed circulator combines ECM motor control with multiple pressure modes for residential heating systems that experience changing zone demand.

- Build: Dry-rot ECM construction, cast iron housing, and a two-bolt flange support residential hydronic installation with compatible system components.
- Value: Variable-speed control can reduce unnecessary pump output when zones close, helping limit noise, energy use, and hydraulic imbalance.
- Audience: Residential HVAC contractors, radiant-floor installers, boiler technicians, hydronic service teams, and property maintenance professionals can apply this model to compatible heating loops.

Applications & Use Cases

Use the Armstrong 119181-113 Compass R20-75 for residential boiler circulation, radiant-floor heating, zone circulation, and closed-loop hydronic systems. Physical dimensions, unit weight, and flange reach were not supplied, so verify pipe spacing, two-bolt alignment, control access, wiring position, motor clearance, and service room before installation.

Warranty & Support

- Factory warranty terms were not included in the supplied product data. Confirm warranty duration, control requirements, registration steps, and authorized service support before purchase.
- Purge trapped air, inspect the flange and seal area, verify control settings, and confirm system pressure during commissioning.

Clean strainers, review variable-speed operation, check for leakage, and confirm the selected pressure mode during scheduled boiler maintenance. Purchase the Armstrong 119181-113 Compass R20-75 variable-speed circulator pump from [store domain] for authentic equipment, applicable factory warranty protection, and pump support.