Bell & Gossett 138810 GMU30P Glycol Make-Up Unit

Large mechanical rooms can evaluate the Bell & Gossett 138810 GMU30P glycol make-up unit with 30-gallon storage, polyethylene tank construction, 115 V single-phase power, automatic pressure-switch control, and a low-level alarm function.

The GMU30P is intended for closed-loop heating, chilled water, process, snowmelt, and radiant-heat systems, with the PVC piping version identified by the part number. Installation requires a level base, accessible service area, supported discharge piping, leak inspection, and secondary containment for glycol service.

System Components

- Thirty-gallon storage capacity establishes the reservoir volume for make-up planning.
- Polyethylene tank construction identifies the documented storage material.
- 115 V single-phase power supports electrical connection and control-panel planning.
- Pressure-switch control provides automatic pump start and stop based on pressure.
- PVC piping identifies the supplied piping configuration for fluid compatibility review.
- A low-level alarm provides a documented status function for maintenance response.
- Closed-loop heating and chilled-water service define the listed application context.

Performance and Application

The GMU30P is listed for closed-loop heating, chilled water, process systems, snowmelt, and radiant heat. Official GMU documentation identifies the 30-gallon class for automatic make-up service, but the supplied SKU record does not establish exact flow, pressure settings, efficiency, or final pump performance.

Installation Requirements

Place the unit on a level, secured base with accessible inspection space, support the discharge line independently, inspect visible fittings for leaks, and provide secondary containment for glycol applications. Install correctly sized relief, expansion, pressure, temperature, and flow-control devices appropriate for the closed-loop system.

Warranty and Maintenance

Bell & Gossett provides an 18-Month Limited Warranty from shipment or a 1-Year Limited Warranty from installation, whichever occurs first, covering defects in materials and workmanship. Proper installation and intended use are required, while misuse, alteration, negligence, and contrary operation are excluded. Mulmotor provides product-information support before purchase and order-related assistance.