Armstrong Model 4030 6x5x11.5 30hp Base Mounted Pump

Commercial hydronic zoning can evaluate the Bell & Gossett 1BL032 PL-55 with 2/5 HP, 115 V single-phase power, cast-iron construction for closed loops, 225°F maximum temperature, and 150 psi maximum working pressure for high-head secondary circulation.

The application requires attention to system resistance, valve losses, and operating temperature. The supplied record does not identify exact flow, head, NPSH, pump curve, seal construction, or efficiency, so the PL-55 designation should not be treated as a complete hydraulic selection for commercial hydronic equipment.

Technical Details

- The 2/5 HP motor establishes the listed power class for commercial hydronic planning.
- 115 V single-phase operation supports electrical compatibility checks before installation.
- Cast-iron construction identifies the body material for closed-loop applications.
- The 225°F maximum temperature establishes the documented thermal boundary for system selection.
- The 150 psi maximum pressure sets an important working-pressure limit.
- High-head secondary zoning defines the listed application context for project evaluation.
- The PL-55 model designation identifies the selected circulator for replacement comparison.

Hydraulic Performance and Application

Commercial hydronic heating and high-head secondary zoning are the documented applications for this pump. Exact flow, head, NPSH, efficiency, and curve values are not supplied, so the 2/5 HP motor does not establish hydraulic capacity. Final selection requires system resistance and operating-point verification.

Installation Requirements

Confirm 115 V single-phase power, closed-loop fluid compatibility, piping connections, flow direction, rotation, temperature below 225°F, working pressure below 150 psi, and service clearance before commissioning. Cast-iron construction should remain within the documented closed-loop application rather than being used for open potable-water service.

Warranty and Maintenance

Bell & Gossett provides an 18-Month Limited Warranty from installation or a maximum of 3 years from the product date code, whichever occurs first, for Series PL booster products. Coverage addresses material and workmanship defects, while improper installation, misuse, alteration, negligence, and contrary operation are excluded. Mulmotor can assist with product details and order-related questions.