A.Y. McDonald AutoPAC P - 20 GPM - 23000 Series, 1/2-5 HP
A.Y. McDonald AutoPAC P - 20 GPM 23000 Series performance curve: total head vs flow by horsepower, Pumps by Baker catalog p. 153
A.Y. McDonald AutoPAC P - 20 GPM - 23000 Series, 1/2-5 HP
A.Y. McDonald AutoPAC P - 20 GPM 23000 Series performance curve: total head vs flow by horsepower, Pumps by Baker catalog p. 153

A.Y. McDonald AutoPAC P - 20 GPM 23000 Constant Pressure Pump

HP - Motor Dia: 1/2 HP - 4 in Motor
Voltage - Phase: 230V 1Ph 2-Wire
Control - Model - Head: Switch - 23050P2-APS - 93 ft at 20 GPM

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$2,082.89
SKU: 6630-587
Weight : 41.0 lb
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Description
A.Y. McDonald · Constant Pressure Pump System
AutoPAC P - 20 GPM, 23000 Series
Baker domestic stainless steel 4 in submersible pump, motor and AutoDRIVE constant pressure drive, 1/2 to 5 HP, 23 builds.
93-644 ft at 20 GPM
1/2-5 HP
230V Single-Phase Supply
AutoDRIVE Constant Pressure VFD
Pressure Switch or Transducer Control
958 ft Max Head (Shut-off)
1 1/4 in NPT Discharge
NEMA 3R Drive Enclosure
39-84 lb Weight
What Ships and What It Needs to Run

Included: the pump end and Baker 4 in motor, assembled, with the AutoDRIVE constant pressure drive matched to the motor, and the pressure switch (APS models) or pressure transducer with 10 ft wire (APT models). The drive model for each build is in the Models table.

Power: 230V single-phase supply from a circuit breaker for every build; the three-phase builds take single-phase power and the drive makes three-phase for the motor. Breaker sizes are under Before You Buy.

Sized at install: drop cable, splice kit and the pressure relief valve shown in the manufacturer’s installation diagram.

Overview

The AutoPAC is Baker’s constant pressure well package: a 23000 Series 4 in submersible pump, a Baker motor of the same horsepower, and the AutoDRIVE variable frequency drive. The drive holds a set pressure by changing the pump speed, which allows a smaller pressure tank and a quick, simple installation; setup takes 5 steps or less on the drive’s backlit display.

This listing is the P - 20 GPM class: 1/2 to 5 HP, with pressure switch and transducer control. The AutoDRIVE is American made and housed in a NEMA 3R steel enclosure rated for outdoor use.

Genuine A.Y. McDonald equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier. Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor.
A.Y. McDonald Warranty

Pump and motor: covered for 5 years from the date of manufacture in potable water applications, and 3 years from the date of manufacture in other applications, under A.Y. McDonald’s published terms for Baker submersible motors and assembled submersible pumps. The AutoDRIVE and pressure control fall under A.Y. McDonald’s standard limited warranty: 2 years from the date of manufacture or 1 year from installation, whichever comes first.

Room to Grow

One pump and one drive per well. Need more head later? Step up in horsepower within the P - 20 GPM class; the drive model changes with the motor (see the Models table). Need more flow? Move to a higher flow class of the AutoPAC 23000 Series; every class uses the same 1 1/4 in NPT discharge.

Models & Ratings (60 Hz)
Model Part No. HP Motor Control AutoDRIVE Head at 20 GPM Shut-off Head Weight
23050P2-APS 6630-587 1/2 230V 1Ph 2-Wire Pressure Switch SD1-2HP2PS 93 ft 146 ft 41 lb
23050P2-APT 6630-581 1/2 230V 1Ph 2-Wire Transducer SD1-2HP2 93 ft 146 ft 41 lb
23050P3-APS 6630-635 1/2 230V 1Ph 3-Wire Pressure Switch SD1-2HP2PS 93 ft 146 ft 39 lb
23050P3-APT 6630-629 1/2 230V 1Ph 3-Wire Transducer SD1-2HP2 93 ft 146 ft 39 lb
23075P2-APS 6630-599 3/4 230V 1Ph 2-Wire Pressure Switch SD1-2HP2PS 136 ft 203 ft 44 lb
23075P2-APT 6630-593 3/4 230V 1Ph 2-Wire Transducer SD1-2HP2 136 ft 203 ft 44 lb
23075P3-APS 6630-647 3/4 230V 1Ph 3-Wire Pressure Switch SD1-2HP2PS 136 ft 203 ft 41 lb
23075P3-APT 6630-641 3/4 230V 1Ph 3-Wire Transducer SD1-2HP2 136 ft 203 ft 41 lb
23100P2-APS 6630-611 1 230V 1Ph 2-Wire Pressure Switch SD1-2HP2PS 166 ft 261 ft 50 lb
23100P2-APT 6630-605 1 230V 1Ph 2-Wire Transducer SD1-2HP2 166 ft 261 ft 50 lb
23100P3-APS 6630-659 1 230V 1Ph 3-Wire Pressure Switch SD1-2HP2PS 166 ft 261 ft 49 lb
23100P3-APT 6630-653 1 230V 1Ph 3-Wire Transducer SD1-2HP2 166 ft 261 ft 49 lb
23100P3Z-APT 6630-886 1 230V 3Ph Transducer SD3-2HP2 166 ft 261 ft 50 lb
23150P2-APS 6630-623 1 1/2 230V 1Ph 2-Wire Pressure Switch SD1-2HP2PS 235 ft 358 ft 56 lb
23150P2-APT 6630-617 1 1/2 230V 1Ph 2-Wire Transducer SD1-2HP2 235 ft 358 ft 56 lb
23150P3-APS 6630-671 1 1/2 230V 1Ph 3-Wire Pressure Switch SD1-2HP2PS 235 ft 358 ft 55 lb
23150P3-APT 6630-665 1 1/2 230V 1Ph 3-Wire Transducer SD1-2HP2 235 ft 358 ft 55 lb
23150P3Z-APT 6630-853 1 1/2 230V 3Ph Transducer SD3-2HP2 235 ft 358 ft 48 lb
23200P3-APS 6630-681 2 230V 1Ph 3-Wire Pressure Switch SD1-2HP2PS 302 ft 462 ft 56 lb
23200P3-APT 6630-676 2 230V 1Ph 3-Wire Transducer SD1-2HP2 302 ft 462 ft 56 lb
23200P3Z-APT 6630-686 2 230V 3Ph Transducer SD3-2HP2 302 ft 462 ft 54 lb
23300P3Z-APT 6630-690 3 230V 3Ph Transducer SD3-3HP2 394 ft 602 ft 68 lb
23500P3Z-APT 6630-694 5 230V 3Ph Transducer SD3-5HP2 644 ft 958 ft 84 lb

Head at 20 GPM is read from the published AutoPAC curve (Pumps by Baker catalog (Sept 2025, rev 3/26), p. 153), digitized and rounded down. Shut-off head as printed. Drive per the compatibility table on p. 141 (1 1/2 HP three-phase builds use the SD3-2HP2). Sources: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 141-143 and 153; Baker Pumps and Accessories price list, effective 7/1/2026.

Shared Specifications
Included Pump end, Baker 4 in motor, AutoDRIVE drive, and pressure switch or transducer
Discharge 1 1/4 in NPT (female)
Check valve Built in
Supply 230V single-phase, 60 Hz
Motor Baker 4 in submersible motor, matched to the pump end horsepower
Pump diameter 3 3/4 in with cable guard
Drive enclosure NEMA Type 3R steel, 12.25 x 9.25 x 4.68 in, 13 lb
Drive operating temperature -4 to 122°F; SD3-5HP2 rated to 104°F
Drive efficiency 95%
App connection None; set up on the drive display

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 131-133 and 141-143.

Performance — Will It Do What You Need?

Total head is everything the pump lifts against: the vertical lift from the pumping water level to the discharge, the pressure you set on the drive (2.31 ft for every PSI), and friction in the drop pipe. The drive slows the pump when demand falls, so the curve below is the most the pump delivers at full speed.

Total head in feet, by flow in GPM, at full speed

HP (stages) 0 5 10 15 20 25 30 35
1/2 HP (5) 152 141 128 112 93 72 43 —
3/4 HP (7) 210 196 179 161 136 103 62 —
1 HP (9) 259 248 230 205 166 122 73 —
1 1/2 HP (12) 359 346 324 286 235 173 100 —
2 HP (14) 459 437 406 360 302 237 144 41
3 HP (20) 600 573 527 465 394 299 180 —
5 HP (32) 959 903 841 765 644 477 281 41

Digitized from the published AutoPAC curve in the Pumps by Baker catalog (Sept 2025, rev 3/26), p. 153, and rounded down. Rated flow (20 GPM) in bold. Zero flow is the shut-off point, a ceiling rather than a working point; — marks flows past the end of that curve.

Best operating range: the published curve shades the most efficient operating range; the catalog prints no figures for it. The curve is in the image gallery.

Before You Buy — The Limits That Decide the Fit
Supply 230V single-phase for every build, from a circuit breaker sized per the table below
Pressure transducer Must be installed upright and vertical (manufacturer note)
Drive location NEMA 3R enclosure, outdoors or indoors; rated to 122°F (104°F for SD3-5HP2); derate above 5500 ft
Motor cooling 1.0 ft/sec of water flow past the motor at 95°F; motor rated to 95°F water
Well size 4 in casing and larger
Pairing One pump and one drive per well

Breaker sizing by motor HP (manufacturer recommendation)

Supply Motor HP Input Current Fuse / Breaker
230V 1/2 6 A 10 A
230V 3/4 9 A 15 A
230V 1 14 A 20 A
230V 1 1/2 18 A 25 A
230V 2 28 A 35 A
230V 2 20 A 25 A
230V 3 30 A 40 A
230V 5 42 A 55 A

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), p. 131.

Materials of Construction (Pump)
Discharge 300 series stainless steel, easy-wrench design with built-in safety eye; threads into the shell
Check valve Baker Diamond Design, easy-out for service
Discharge bearing Rubber around the stainless steel shaft; self-lubricating
Diffusers Polycarbonate, corrosion and abrasion resistant, built for sand handling
Impellers Glass bead acetal
Shaft 7/16 in 300 series stainless steel, hex drive, each one measured for straightness
Shell Heavy stainless steel, threaded at both ends for field service
Cable guard Stainless steel; angled top keeps the leads in place
Motor bracket Stainless steel

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 51-52.

Service Parts
Part Part No.
AutoDRIVE pressure transducer with 10 ft wire 6619-028
AutoDRIVE pressure switch with wire 6619-029
AutoDRIVE keypad 6619-030

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 142-143.

For engineering-led sizing and selection support or a factory submittal, email sales@watermainsupply.com or call 1-888.510.4036.
© Watermain Supply — A division of E4 Industrial LLC
Data Sheet
Pumps by Baker AutoPac Guide
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