Hobart AM14 Installation Manual

4.3 (3)
MODEL AM14 & AM14C DISHWASHERS
MODELS
AM14 ML-32614 AM14C ML-32615
701 S. RIDGE AVENUE
TROY, OHIO 45374-0001
937 332-3000
www.hobartcorp.com
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
STEAM HEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DISHWASHER CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Check Rotation (Three Phase Machines Only) . . . . . . . . . . . . . . . . . . . . . . . . 10
ELECTRIC BOOSTER WATER HEATER CONNECTION . . . . . . . . . . . . . . . . . . 11
OPTIONAL EQUIPMENT CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . . . . 11
Detergent Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Rinse Aid Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Vent Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Hobart Infrared Booster Gas Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DISHWASHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DOs AND DON’Ts FOR YOUR NEW HOBART WAREWASHER . . . . . . . . . . . . . . . 16
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
WASH ARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MOTOR(S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
GAS FLUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MANUAL RESET BUTTON ON PUMP MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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
Pressure Gauge
Line Strainer ­Make Fill Connection Here
Control Box
Turn Feet to Level Machine
PL-40827-1
NEW CONTROL BOX
PL-41176-1
Model AM14C
Model AM14
with Booster Heater
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.
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Available as an optional accessory is a frame-mounted 10KW electric booster to maintain a minimum final rinse temperature of 180°F.
Also available as an optional accessory is the model IB57 Infrared Booster Gas Water Heater.
Also available are circuit breaker(s) and/or single point electrical connection options.

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 (and booster data plate if applicable). The dishwasher data plate is located either on the front of the upper wash tank, viewable after the front panel is removed, or on the side of the control box. A separate data plate for the electric booster is located on the back side of the booster (when equipped).
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, steam or 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.
5
The control box (Fig. 1) is mounted 4
/8" below the dish
table when shipped from the factory. It can be changed
5
/8" or 31/8" below the dish table by removing the
to 12 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
Fig. 2
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 or steam 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.
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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:
AND PLUMBING CODES.
PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY, SAFETY,
DRAIN CONNECTION
The drain connection is made using 2" pipe. If a right hand drain is desired, it can be changed from the standard left-hand by removing the pipe plug
from the drain valve and reinstalling it in the opposite end of the drain valve. 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
The water supply line is connected to the line strainer (Fig. 1) with
3
/4" pipe.
Minimum water temperatures are listed below:
Sanitizing Mode Wash Rinse
Hot Water 150°F (66°C) 180°F (82°C) Chemical (Normal Duty) 120°F (49°C)* 120°F (49°C)* Chemical (Light Duty) 130°F (54°C)* 120° F (49°C)*
* Temperatures shown are minimum; recommended temperature is 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. Present models monitor the water pressure when the solenoid valve is open and water is flowing. On earlier models where the pressure gauge was connected into a petcock, the petcock MUST always remain closed except when making an instantaneous check of flowing pressure.
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