American Dish Service ET-AF-3

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Summary

Plumbing Section

Hot Water Connection

Connect plumbing to the dishmachine, ensuring proper water temperature and flow for operation.

Drain Size

The gravity drain model requires a 1.5” female pipe for the sump exit.

Chemical Feeders Section

Chemical Feeder Pumps

Details the three peristaltic pumps for dispensing liquid chemicals and their color coding.

Cam Timer Adjustment Section

Cam Timer Adjustment Tool

Tool for adjusting cam notches to control cycle timing and function duration.

Cam Timer Operation

Explains how cams control machine functions and timing cycles.

Tuning a Dump & Fill Machine Section

Cam Functions

Details the specific function of each numbered cam in the timer assembly.

Tuning Procedure

Guide to adjusting fill cam for optimal cleaning by managing water fill and drain sequences.

This document provides installation instructions for the American Dish Service Model ET-AF-M/ET-AF-3 (Gravity-Drain) dishmachine. This is an undercounter, single-rack, chemical sanitizer, dump and fill dishmachine available in 90, 120, and 150-second time cycles. It is listed by UL #E65894, NSF/ANSI 3, ASSE 1004 #933, LA Test Labs File M-840044, and Mass. License P3-0111-306.

Function Description

The ET-AF-M/ET-AF-3 is designed for commercial ware-washing, utilizing chemical sanitization. It operates on a dump and fill principle, meaning it drains soiled wash water completely before refilling for the rinse cycle. The machine uses peristaltic pumps to dispense three liquid chemicals: detergent (red line), sanitizer (green line), and rinse-aid (blue line). Sanitizer (chlorine) concentrations should be set at 50 parts per million. The machine's operation is controlled by a mechanical cam timer, which manages various functions like wash, drain, fill, and chemical dispensing.

Important Technical Specifications

Electrical: The machine requires a 120-volt, 20-amp electrical supply. It should be connected using two #10-12-gauge wires and one suitable green ground wire. A 20-amp breaker or fuse on a dedicated "clean circuit" is recommended. GFCI outlets are not recommended for commercial dishmachines; a hard-wired connection directly from the circuit breaker is preferred. If a plug and socket are used, the GFCI must be rated for the circuit's draw. The wash motor is 1.5 HP.
Water Heater: Water heaters or boilers must provide a minimum temperature of 120°F, with 130-140°F recommended for optimal performance. The machine demands a minimum of 60 gallons per hour (GPH) for ET-AF-M or ET-AF-3 models. Temperatures above 150°F exceed operational design limits. This model cannot be converted to high-temp sanitizing by adding a booster heater.
Water Pressure: A minimum flow pressure of 15 psi is needed during the fill cycle. If the machine takes more than 20 seconds to fill to the water level decal, building pressure is insufficient.
Water Quantity: The dishmachine requires 1.7 gallons of water supplied within 7 seconds for a full cycle. Tankless water heaters can be problematic if they cannot meet this demand.
Drain: The gravity drain model uses a 1.5” female pipe to exit the sump. Drain lines should be run as straight as possible, downhill, and without tight radius elbows or 180° bends. The pipe diameter should not be reduced.
Chemicals: Use only commercial-grade low-energy, non-foaming detergents and buffered sanitizers. Chlorine-based sanitizers should not exceed 50 parts-per-million (PPM) to prevent damage to metals and welds.
Space Requirements: The machine must be installed with space around the outside for motor servicing and a 4-inch space behind it from the wall. It should not be built into wooden cabinets.
Cycle Times: Available in 90, 120, and 150-second cycles. The 90-second cycle is the shortest and NSF compliant. Changing to a longer cycle requires changing the entire cam timer assembly.

Usage Features

Initial Flush: Before installing the spray arm, the machine must be flushed. Fill the machine by holding the "FILL" button until the water level decal is reached, then press "START" for one cycle. Dump the flush water using the "DRAIN" button to remove installation debris and prevent damage to the spray arm bearing.
Chemical Priming: Chemical prime switches are located on the control box door. Use these momentary switches to prime chemicals, ensuring all three pumps rotate. If a squeeze tube has taken a set, manually free the pump by pulling on the discharge side while pushing the prime switch.
Water Level Decal: An external decal indicates the approximate water level for initial fill.
Safety: Do not open doors while the machine is in cycle to avoid serious bodily injury from spraying hot water and chemicals.

Maintenance Features

Electrical Connections: Before connecting power, check all electrical terminals in the control box for looseness, as screws can loosen in transit. Loose connections can cause wire burning and component damage.
Chemical Lines: Inspect transfer tubing for cuts or holes and keep them protected and secured. Squeeze tubes for chemical pumps should be replaced at least every six months.
Chemical Alarm (Optional): An optional audible chemical alarm (P/N 031-0326) uses a pressure switch connected to the chemical line. Sensitivity can be adjusted with an Allen wrench (5/64” or 2mm) by turning a screw in the center of the barb. Chemical buckets must be placed on the floor for the pressure switch to work.
Cam Timer Adjustment: The cam timer controls chemical dispensing and water fill time. The timer adjustment tool (provided and taped to the control box shelf) is used to widen or close the notch on the left-side cam wheel, which controls the "ON" time for each function. Factory settings are initial and require adjustment based on chemical concentration and water conditions.
Spray Arm Pressure Tester: A spray arm pressure tester (Kit #088-1048) can be used to verify full spray arm pressure by attaching it to the lower wash arm.
Pump Filter: The pump filter in the sump area should be inspected and emptied only after the machine is completely drained.
Personal Protective Equipment: Wear approved safety eye-wear when connecting chemicals and performing installations.
MSDS Sheets: Refer to chemical manufacturer's safe practices and MSDS sheets for handling and installing chemicals.

American Dish Service ET-AF-3 Specifications

General

Model	ET-AF-3
Width	24 Inches
Type	Commercial Dishwasher
Water Consumption	1.5 gallons per rack
Water Usage	1.5 gallons per rack
Voltage	208-240V
Dimensions	24" W x 25 1/4" D x 33 1/2" H