A.Y. McDonald DuraMAC Micro Duplex Variable Speed Booster Pump

The DuraMAC Micro Vertical Multistage Variable Speed Duplex Booster System changes motor speed with the demand of the system, which saves energy over traditional constant speed booster systems. It is simple, versatile and reliable, with easy set-up installation.

Each pump runs on its own Yaskawa iQpump Micro drive, whose software and internal PLC protect the drive, pump, motor and system. Stainless steel pump, energy-efficient NEMA TEFC motors, 2 in NPT stainless steel manifolds and a 304 stainless steel base.

Typical applications: commercial buildings, apartment buildings, schools, light industrial and process water, and irrigation where pressure has to hold steady as demand changes.

Two pumps carry double the flow at the same pressure, and hold more pressure at the flow the building draws. At 40 GPM a single 17066V040Y adds 34 psi; this 17066V080Y Duplex adds 57 psi, because each pump carries half the water (A.Y. McDonald’s published simplex and duplex charts).

Each pump has its own drive and discharge transducer. For larger buildings, the IQ1000 family runs to 420 GPM.

The figures below are the pressure this system adds at full speed, all pumps running. That is what a pump curve measures — the impeller does not know what pressure is already on its inlet. The drive holds lower pressures by running slower, so the curve is the ceiling at each flow.

Models · 40 GPM

Models · 80 GPM

Every model: 56C motor frame.

Source: Baker Water Systems DuraMAC Booster Pumps catalog, rev 3/26, pp. 257–260 and 269–273. Minimum tank, motor frame and PEI from A.Y. McDonald’s technical information pages. — = no PEI published for that model.

Pressure added in PSI, both pumps running, by system flow · 40 GPM models · curves end at 53–56 GPM

Pressure added in PSI, both pumps running, by system flow · 80 GPM models · curves end at 101–103 GPM

Drawing from a tank or cistern — nothing arrives with pressure, so what the pump adds is what you get. Read the table straight through at the flow the building needs.

Fed by a city main — the pump adds on top of what already arrives, and the drive holds the set point you program. Incoming pressure turns into extra flow at the same set point.

Size to the published curve. This is where the pump turns the most electricity into water pressure. Ask for more flow than it can deliver at your setting and it runs at full speed continuously, which is where motors and seals wear out. Sizing a booster to the building rather than to the headline numbers is what makes it last.

Zero flow is the shut-off point — a ceiling, not a working point; the zero-flow column shows the published model boost. Figures are 60 Hz US data at full speed, digitized from the published curves in the Baker Water Systems DuraMAC Booster Pumps catalog, rev 3/26, p. 260, and rounded down. The catalog rates these models at 20 or 40 GPM per pump; the published curves continue beyond that rating. A.Y. McDonald publishes no efficiency curve for these models, so no best operating range is stated. Voltage builds of the same model (-1, -3) run on the same curve. Where a table’s last column is not the curve end, the curve end is named in its title. Points left out to keep the tables readable: 10, 30, 50 GPM on the 80 GPM models table. The full curves are in the image gallery. Feet of head = PSI × 2.31.

• Variable speed control speeds up and slows down with demand, holding a constant pressure.
• Factory set point 50 psi, easily changed in the field.
• Sleep Mode with low-flow protection, sleep boost and automatic system restart.
• Dry-run protection.

Parts in contact with the water, per the Baker Water Systems DuraMAC Booster Pumps catalog, rev 3/26.

Seals, impellers, drive components and other service parts for these systems are listed on DuraMAC Booster Pump Parts — Micro, by part number.