Hobart AM14 ML-110976 Instruction Manual
MODEL AM14 & AM14C DISHWASHERS
MODELS
AM14 ML-110976
AM14C ML-110977
701 S. RIDGE AVENUE
TROY, OHIO 45374-0001
937 332-3000
www.hobartcorp.com
FORM 34554 (Dec. 2000)
POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE
EVENT THE SMELL OF GAS IS DETECTED. THIS INFORMATION CAN BE OBTAINED
FROM THE LOCAL GAS SUPPLIER.
IMPORTANT
IN THE EVENT A GAS ODOR IS DETECTED, SHUT
DOWN UNIT(S) AT MAIN SHUTOFF VALVE AND
CONTACT THE LOCAL GAS COMPANY OR GAS
SUPPLIER FOR SERVICE.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER
FLAMMABLE VAPORS OR LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.
© HOBART CORPORATION 1982, 1995
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TABLE OF CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
WATER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PLUMBING CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DRAIN CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
WATER CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Without Electric or Gas Booster Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
With Electric Booster Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
GAS TANK HEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VENTING REQUIREMENTS — WITH GAS TANK HEAT . . . . . . . . . . . . . . . . . . . . . . 8
RATE OF EXHAUST FLOW CALCULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Dishwasher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Check Rotation (Three Phase Machines Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electric Booster Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
OPTIONAL EQUIPMENT CONNECTIONS – Vent Fan & Gas Booster . . . . . . . . . . . . . . 11
Vent Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Hobart Infrared Booster Gas Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DETERGENT, RINSE AID, OR SANITIZER DISPENSERS – Tubing Installation . . . . . . 12
Detergent Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Rinse Aid Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chemical Sanitizer Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPTIONAL EQUIPMENT CONNECTIONS – Detergent, Rinse Aid, Sanitizer Dispenser 13
Detergent Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Rinse Aid and / or Sanitizer Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DISHWASHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DOs AND DON’Ts FOR YOUR NEW HOBART WAREWASHER . . . . . . . . . . . . . . . 17
MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Wash Arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Motor(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Gas Flue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Manual Reset Button on Pump Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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Installation, Operation, and Care of
MODEL AM14 & AM14C DISHWASHERS
SAVE THESE INSTRUCTIONS
GENERAL
The AM14 dishwashers are semi-automatic rack-type machines. On model AM14, the doors open on
opposite sides of the machine allowing the rack to move straight through. Model AM14C can be located
in a corner; adjacent doors open so the rack moves in and out at a 90° angle. The AM14 and AM14C
dishwashers are designed to operate in one of two modes: Hot water sanitizing mode (designated by
the letter "H" at the end of the machine serial number), or a chemical sanitizing mode (designated by
the letter "L" at the end of the machine serial number). The serial number can be found on the machine
data plate.
Model AM14 Model AM14C
with Booster Heater shown
Fig. 1
DO NOT attempt to operate this dishwasher in the chemical sanitizing mode without a properly
installed, NSF-listed, chemical sanitizer feeder (not supplied with machine). Contact an authorized
detergent representative for information about a chemical sanitizer feeder.
The pump motor is rated 1 H.P. and has thermal overload protection.
The fill line incorporates an atmospheric vacuum breaker to prevent any reverse flow of water from the
dishwasher into the potable water supply.
A float, located in the wash tank, will shut off the heat supply if the water level becomes too low. When
the water returns to a proper level, the heating circuit is again operational.
A frame-mounted 13KW electric booster water heater is available as an option on machines equipped
with electric tank heat. The booster water heater is designed to maintain a minimum final rinse
temperature of 180°F provided the incoming water to the booster heater is at least 110°F.
Also available as an optional accessory is the model IB57 Infrared Booster Gas Water Heater.
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INSTALLATION
UNPACKING
Immediately after unpacking the dishwasher, check for possible shipping damage. If this machine is
found to be damaged, save the packaging material and contact the carrier within 15 days of delivery.
Prior to installation, test the electrical service to make sure it agrees with the specifications on the
machine data plate which includes the optional electric booster, if equipped. The dishwasher data
plate is located on the side of the control box.
INSTALLATION CODES
Installation must be in accordance with state and local codes, or in the absence of local codes, with
the National Fuel Gas Code, ANSI Z223.1 (latest edition) if applicable, and the National Electrical Code
ANSI/NFPA 70 (latest edition). In Canada, the installation standards are: CAN/CGA B149.1,
CAN/CGA B149.2, and CSA C22.2 No.1 (latest editions).
LOCATION
Place the dishwasher in its operating location. Before finalizing the location, make sure that
consideration has been given for the electrical conduit, water supply, drain connection, gas supply and
venting (if applicable), tabling (if needed), chemical feeder replenishment (if applicable), and adequate
clearance for opening the doors. Allow adequate clearance for service.
The control box (Fig. 1) is mounted 4
5
/8" below the dish
table when shipped from the factory. It can be changed
1
to 11
/8" or 5/8" below the dish table by removing the
two mounting bolts and reinstalling them in the holes
provided.
The dishwasher must be level before any connections
are made. Turn the threaded feet (Fig. 1) as required
to level the machine and adjust to the desired height.
Dish tables should be turned down and fitted into the
dishwasher (Fig. 2). Use an NSF approved sealer
between table and tank lip to prevent leakage. Fasten
the tables to the tank lip with truss head screws.
High-temperature or gas heat dishwashers will
probably require a hood or vent over the dishwasher
in order to meet local codes. Low-temperature
chemical sanitizing machines or low usage electric
heat dishwashers may not require individual venting
of the machine if the room is amply exhausted. Refer
to pages 8 and 9 for venting and hood requirements.
Fig. 2
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WATER REQUIREMENTS
Proper water quality can improve ware washing performance by reducing spotting, lowering chemical
supply costs, enhancing effectiveness of labor, and extending equipment life. Local water conditions
vary from one location to another. The recommended proper water treatment for effective and efficient
use of this equipment will also vary depending on the local water conditions. Ask your municipal water
supplier for details about local water specifics prior to installation.
Recommended water hardness is 4 – 6 grains of hardness per gallon. Chlorides must not exceed 50
parts per million. Water hardness above 6 grains per gallon should be treated by a water conditioner
(water softener or in-line treatment). Water hardness below 4 grains per gallon also requires a water
treatment to reduce potential corrosion. Water treatment has been shown to reduce costs associated
with machine cleaning, reduce deliming of the dishwasher, reduce detergent usage, and reduce
corrosion of metallic surfaces in the booster water heater and dishwasher.
Sediment, silica, chlorides, or other dissolved solids may lead to a recommendation for particulate
filtration or reverse osmosis treatment.
If an inspection of the dishwasher or booster heater reveals lime build-up after the equipment has been
in service, in-line water treatment should be considered, and, if recommended, should be installed and
used as directed. Contact your Hobart Service office for specific recommendations.
PLUMBING CONNECTIONS
WARNING:
PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY, SAFETY,
AND PLUMBING CODES.
DRAIN CONNECTION
The drain connection is made using 2" pipe.
If a right hand drain is desired on an electric heat machine, it can be changed from the standard lefthand by removing the pipe plug from the drain valve and reinstalling it in the opposite end of the drain
valve. On gas heat machines, the drain must be connected on the right side.
If a grease trap is required by code, it should have a minimum flow capacity of 42 gallons per minute.
WATER CONNECTION
A suitable water hammer arrestor should be installed in the water line just ahead of the dishwasher.
Without Electric or Gas Booster Water Heater
3
The water supply line is connected to the line strainer (Fig. 1) with
/4" pipe. A manual shut off valve
and pipe union are required. The required incoming water supply temperature follows:
Sanitizing Mode
Minimum Temperature Recommended Temperature
Hot Water Sanitizing 180°F
Chemical Sanitizing (Normal Duty) 120°F
Fill and Final Rinse — Water Supply
(82°C)
(49°C)
180°F
140°F
(82°C)
(60°C)
Chemical Sanitizing (Light Duty) 120°F
(49°C)
140°F
(60°C)
Proper dishwasher operation requires a flowing pressure of 20 ± 5 psig at the dishwasher. If the flowing
pressure exceeds 25 psig, a pressure reducing valve (not supplied) must be installed in the water
supply line. CAUTION: The water pressure regulator must have a relief by-pass. Failure to use
the proper type of pressure regulator may result in damage to the unit.
A pressure gauge (Fig. 1) is provided for verification of proper water pressure. The water pressure is
monitored when the solenoid valve is open and water is flowing.
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