Adjust hydronic flow with Armstrong 119381-113 Compass R40-45CI, an ECM circulator for variable-flow heating systems and modern balancing work. The 120 V single-phase pump uses adaptive power from 5 W to 45 W, helping the motor respond to changing demand instead of running at one fixed output. Its 14.7 feet maximum head suits lower-resistance circuits. Confirm the required duty point, connection arrangement, and control settings before installation.

The inverter-driven ECM motor can move up to 40 GPM through the cast-iron pump body. A digital speed and mode LED display gives technicians direct setup feedback, while integrated electronic overload protection helps protect the motor during abnormal operating conditions. The supplied data does not state seal material, exact connection size, dimensions, or weight, so verify the current submittal and available service clearance before startup.

Key Features & Benefits

- ECM Inverter-Driven Motor: Adjusts circulation for variable-flow hydronic systems and changing heating demand.
- 5 W to 45 W Adaptive Power: Helps reduce unnecessary electrical use during lower-load operation.
- 40 GPM Maximum Flow: Supports larger residential and light commercial heating circuits within the stated rating.
- 14.7 Feet Maximum Head: Provides a clear selection reference for lower-resistance system layouts.
- Digital LED Interface: Gives technicians direct speed and mode feedback during pump setup.
- Electronic Overload Protection: Helps protect the motor during abnormal operating conditions.
- 120 V Single-Phase: Fits compatible US service panels without requiring three-phase power.
- Cast-Iron Body: Provides the specified casing material for compatible hydronic heating applications.

Why Choose Armstrong 119381-113 Compass R40-45CI

The Compass R40-45CI is aimed at hydronic systems that do not operate at one fixed flow condition. Its ECM motor, adaptive power range, and digital interface give installers more control than a basic fixed-speed circulator.

- Build: Cast iron, ECM motor technology, electronic overload protection, and LED controls provide defined construction and operating features.
- Value: Adaptive power and variable-speed operation can reduce unnecessary run power when system demand drops.
- Audience: Suited to hydronic contractors, radiant-heating installers, retrofit teams, and facility maintenance technicians.

Applications & Use Cases

Use Armstrong 119381-113 Compass R40-45CI for modern hydronic balancing, variable-flow heating systems, radiant circuits, and compatible retrofit projects. Manufacturer reference data identifies the R40-45 configuration with a compact 6.5-inch flange-to-flange dimension and 10-pound approximate weight. Confirm the exact connection pattern, bolt spacing, orientation, and service clearance before installation.

Warranty & Support

- Warranty Terms Require Confirmation: Verify duration, coverage, registration, exclusions, and authorized service requirements with Armstrong or the seller.
- Match SKU 119381-113, Compass R40-45CI, 120 V supply, and connection details against the existing nameplate.

Flush the loop, purge trapped air, verify the 120 V supply, and inspect the display and control response during commissioning. Confirm the operating point stays below the 14.7-foot head rating, then monitor noise, vibration, temperature, and fault indications. Purchase the Armstrong 119381-113 Compass R40-45CI ECM hydronic circulator through Mulmotor.com for authentic equipment, applicable warranty support, and pump assistance.