A.Y. McDonald 27000 Super Booster Multistage Pump - NSF 61/372 Potable

A.Y. McDonald builds the 27000 Super Booster for jobs that need high pressure at modest flow: booster systems, filtration, spray systems, water circulation and reverse osmosis, plus general-purpose pumping in residential and commercial work and pressure washing in agriculture. The line runs from 1/2 to 2 HP in six flow groups, rated by the nominal flow in the model name: J 5 GPM, V 7 GPM, K 10 GPM, L 15 GPM, P 20 GPM and M 25 GPM.

Certified for drinking water to NSF/ANSI 61 and NSF/ANSI 372.

The pump is meant to be fed with water at or slightly above the centerline of its impellers: from a city main, a wall hydrant, or a storage tank piped to the intake. It lifts 2 to 3 ft at most, and only with a dependable foot valve and a priming tee.

• Keyed-shaft motor with shaft extension and coupling — the motor and the pump end separate for easy motor replacement.
• Corrosion-resistant build — stainless steel shell, shaft extension and hex shaft; no-lead brass intake and discharge; thermoplastic impellers and diffusers.
• 3/4 in ceramic/carbon rotary mechanical seal and a drain plug.

Each 27000 Super Booster runs as one self-contained pump. Size it to the full peak demand at the pressure you need.

Each table shows the pressure the pump develops at the flow shown, in PSI. Find your nominal flow group, then your model, and read across: the first column is the shut-off, the most the model can make.

J group, 5 GPM nominal · pressure in PSI

V group, 7 GPM nominal · pressure in PSI

K group, 10 GPM nominal · pressure in PSI · curves end at 20–21 GPM

L group, 15 GPM nominal · pressure in PSI · curves end at 26–28 GPM

P group, 20 GPM nominal · pressure in PSI · curves end at 31–33 GPM

M group, 25 GPM nominal · pressure in PSI · curves end at 34–36 GPM

Reading it: the 1 HP K model (27100KHB) holds 116 PSI at 10 GPM and 69 PSI at 15 GPM. Fed from a city main, the pump adds its pressure on top of what arrives, so a pressure relief valve is always required.

Zero flow is the shut-off point — a ceiling, not a working point, and A.Y. McDonald warns against running against a closed valve for more than a minute. Figures are 60 Hz US data digitized from the published curves in the Pumps by Baker catalog, rev 3/26, pp. 277-278, and rounded down, at the digitized flows nearest 20%, 50% and 75% of each group’s curve end; the 0 GPM column is the published shut-off. The last column is the last digitized point; where a group’s curves run further, the curve end (max flow, rounded down) is named above its table. The full curves are in the image gallery and on the Data Sheet tab. Feet of head = PSI × 2.31.

Three-phase builds (suffix Z, 230V; suffix Y, 460V) and single-phase TEFC builds (suffix FC) use the same pump end and published curve as the single-phase model with the same letter and HP. Factory wiring: 1/2 HP models ship wired for 115V, 3/4 HP and larger for 230V, and 2 HP models are 230V only. Voltage is changed with the voltage change device on the motor, never at the pressure switch.

Shut-off sources: Pumps by Baker catalog, rev 3/26, pp. 277-278, and Installation Instructions 3210-371 (3/22). For 27100MHB and 27200MHB A.Y. McDonald prints 81 and 149 psi beside 178 ft and 327 ft; the feet and the published curve give 77 and 141 psi, and the lower figure is shown.

Per the Pumps by Baker catalog, rev 3/26, pp. 275-276.