Whirlpool® Undercounter Dishwasher

PRODUCT MODEL NUMBERS: WDT550SAPW, WDT550SAPZ, WDT550SAPB

DRAIN REQUIREMENTS

  • A new drain hose is supplied with the dishwasher. If the drain hose is not long enough, use a drain hose extension with a maximum length of 12 ft (3.7 m).
  • Ensure the drain hose is connected to a waste tee or disposer inlet above the drain trap in house plumbing and at least 20" (508 mm) above the floor. It is recommended that the drain hose either be looped up and securely fastened to the underside of the counter or be connected to an air gap.

IMPORTANT: This product is not equipped with a high loop on the side of the dishwasher. The installer is responsible for adding a high loop in the adjacent cabinet. A high loop is required if the dishwasher will drain into a floor drain. This prevents water draw-off from the dishwasher during operation. When the drain is connected to a sink drain, counter-top air-gap, or disposer, the high loop is generally not required. An internal check valve in the drain prevents back-flow into the dishwasher.

  • Ensure an air gap is used if the drain hose is connected to house plumbing lower than 20" (508 mm) above the subfloor or floor.

Use of air gap

Diagram illustrating a typical plumbing setup for a dishwasher drain with an air gap. The air gap device is mounted on the countertop, with the dishwasher drain hose connecting to its inlet, and an outlet hose connecting from the air gap to the waste tee or disposer inlet, ensuring a break in the plumbing line to prevent backflow.

  • If required, the air gap should be installed in accordance with its installation instructions. When connecting the air gap, a rubber hose (not provided) will be needed to connect to the waste tee or disposer inlet.
  • Use 1/2" (13 mm) minimum I.D. drain line fittings.

WATER SUPPLY REQUIREMENTS

  • This dishwasher may be fitted with a smart inlet hose with a water cut-off valve. Do not cut the water inlet hose for any reason during installation, adaptation, or shortening.
  • This dishwasher has a water heating feature and requires a connection to a hot water supply line.
  • A hot water line with 20 psi to 120 psi (138 kPa to 862 kPa) water pressure can be verified by a licensed plumber.
  • 120°F (49°C) water at the dishwasher inlet.
  • 3/8" (9.5 mm) O.D. copper tubing with compression fitting or flexible braided water supply line.
  • Included water inlet hose with Leak Detection System for some models.
  • Included 3/8" (9.5 mm) Compression x 3/4" (19 mm) Water inlet adapter (only for models with Leak Detection System).
  • If installed in new construction, ensure house water supply lines have been flushed prior to connecting the dishwasher to remove any debris.

ELECTRICAL REQUIREMENTS

Ensure that the electrical connection and wire size are adequate and in conformance with the National Electrical Code, ANSI/NFPA 70 - latest edition, and all local codes and ordinances.

For a fee, a copy of the above code standards can be obtained from:

National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02169-7471

You Must Have:

  • 120 V, 60 Hz, AC only, 15 A or 20 A, fused electrical supply.
  • Copper wire only.
  • A maximum of 2 field wiring supply conductors (12 AWG largest size) plus 1 grounding conductor are permitted in the terminal box.

We Recommend:

  • Install the dishwasher on a circuit with appropriate interruption per your local code. The dishwasher is compatible with time delay fuses, standard circuit breakers, and GFCI and AFCI circuit breakers.

Circuit Requirement:

  • The dishwasher may be installed on the same circuit as a garbage disposal provided that the branch circuit cannot exceed rated circuit load and must comply with all governing codes and regulations such as, but not limited to, National Electrical Code, ANSI/NFPA 70 - latest edition.
  • No electrical connections other than the dishwasher power and ground connections can be made inside of the dishwasher junction box.

If Connecting Dishwasher with a Power Cord:

  • Use a UL Listed power cord kit marked for use with a dishwasher. Refer to the "Tools and Parts" section at the front of the Owner's manual for part details and orders.
  • Plug into a grounded 3-prong outlet. The outlet must meet all local codes and ordinances.

Illustration of a standard 3-prong electrical outlet, indicating the need for a grounded connection.

If Connecting Dishwasher with Direct Wiring:

  • Use flexible, armored, or nonmetallic sheathed copper wire with a grounding wire that meets the wiring requirements for your home and local codes and ordinances.

Illustration showing a flexible electrical conduit with internal wires, representing direct wiring connections.

  • Use only the supplied plastic cable fittings for flexible and non-metallic sheathed wiring (Romex, etc.). Do not use metallic strain reliefs for these wire constructions.
  • Use a UL-listed/CSA-approved metallic strain relief for armored cable installations (21 mm diameter), following the strain relief's manufacturer installation instructions.

PRODUCT DIMENSIONS

This section provides detailed dimensions for the Whirlpool Undercounter Dishwasher, including both standard and panel-ready models, and cabinet opening requirements.

Standard Models

Front view of the dishwasher showing width C. Side view showing height A, depth D, and internal dimensions E and F.

  • C: 23⁹/₁₆" (599 mm)
  • A: 32¼"-35⁷/₁₆" (820-900 mm)
  • B: 22⅝" (574 mm)
  • D: 28⅜" (721 mm)
  • E: 14¹/₁₆" (358 mm)
  • F: 18¾" (477 mm)

Panel Ready Models

Front view of the panel-ready dishwasher showing width C. Side view showing height A, depth D, and internal dimensions E, F, and G*.

  • C: 23⁹/₁₆" (599 mm)
  • A: 32¼"-35⁷/₁₆" (820-900 mm)
  • B: 21⅞" (555 mm)
  • D: 18¾" (477 mm)
  • E: E = A - G
  • F: 11/16"-1¾" (18-45 mm)
  • G: 28⅜"-29¹⁵/₁₆" (720-760 mm)

NOTE: If a custom toe kick is desired to be installed, adjust the thickness of the custom panel to make it flush with the cabinet toe kick. The product's original metal toe kick must remain even if a custom toe kick is installed.

CABINET OPENING DIMENSIONS

Diagram illustrating the required cabinet opening dimensions for dishwasher installation. Shows height A, width B, and depth C.

  • A: 32¼"-35⁷/₁₆" (820-900 mm) measured from the lowest point on the underside of the countertop.
  • B: 24" (609.6 mm) Minimum
  • C: 23⅝"-24¼" (600-616 mm) Minimum, measured from the narrowest point of the opening.
Models: WDT550SAPW 24 Inch with 3rd Rack Dishwasher, WDT550SAPW, 24 Inch with 3rd Rack Dishwasher, 3rd Rack Dishwasher, Rack Dishwasher, Dishwasher

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