Hobart AM15T-2 Service Manual
AM15 DISHWASHE R
TECHNICAL MANUAL
208-240V/60/3
SPECIFICATION SHEET
INSTALLATION INSTRUCTIONS
OPERATION INSTRUCTIONS
CLEANING INSTRUCTIONS
MAINTENANCE INSTRUCTIONS
TROUBLE SHOOTING INSTRUCTIONS
WIRING DIAGRAMS
CATALOG OF REPLACEMENT PARTS
SMARTPARTS™ USER GUIDE
RECOMMENDED SPARE PARTS LIST
AM15 Dishwasher Technical Manual Page 2 of 83
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C.S.I. Section 11400
AM SELECT
701 S Ridge Avenue, Troy, OH 45374
STANDARD FEATURES
■ .74 gallons per rack nal rinse water
■ 58 racks per hour – hot water sanitizing
■ 65 racks per hour – chemical sanitizing
■ NSF pot and pan listed for 2-, 4- & 6- minute
cycles
■ Timed wash cycles for 1, 2, 4 or 6 minutes
■ Solid state, integrated controls with digital status
indicators
■ Self-draining, high efciency stainless steel pump
and stainless steel impeller
■ Stainless steel drawn tank, tank shelf, chamber,
trim panels, frame and feet
■ Spring counterbalanced chamber with
polyethylene guides
■ Revolving, interchangeable upper and lower anticlogging wash arms
■ Revolving, interchangeable upper and lower rinse
arms
■ Slanted, self-locating, one-piece scrap screen
and basket system
■ Automatic ll
■ Door actuated start
■ Automatic drain closure
■ Vent fan control
■ External booster activation
■ Delime cycle
■ Service diagnostics
■ NAFEM Data Protocol capable
■ Straight-through or corner installation
■ Hot water or chemical sanitation
DISHWASHER
MODEL
❑ AM15
OPTIONS AT EXTRA COST
❑ Gas heat
❑ Sense-A-Temp™ 70°F rise electric booster heater
❑ Single point electrical connection for booster
equipped machines (3 phase only)
ACCESSORIES
❑ 3⁄4" pressure regulator valve
❑ Peg rack
❑ Combination rack
❑ Splash shield for corner installations
❑ Flanged and seismic feet
❑ End of cycle audible alarm (eld activated)
❑ Delime notication (eld activated)
❑ Drain water tempering kit
Specications, Details and Dimensions on Inside and Back.
AM SELECT DISHWASHER
VOLTAGE
❑ 208-240/60/1
❑ 208-240/60/3
❑ 480/60/3
❑ 200-240/50/3*
❑ 380-415/50/3*
*Not submitted for UL/CUL Listing
F-40078 – AM Select Dishwasher Page 1 of 8
AM SELECT
AM15 Dishwasher Technical Manual Page 4 of 83
DISHWASHER – ELECTRIC
701 S Ridge Avenue, Troy, OH 45374
Page 2 of 8 F-40078 – AM Select Dishwasher
AM SELECT
AM15 Dishwasher Technical Manual Page 5 of 83
701 S Ridge Avenue, Troy, OH 45374
DISHWASHER – ELECTRIC
F-40078 – AM Select Dishwasher Page 3 of 8
AM SELECT
AM15 Dishwasher Technical Manual Page 6 of 83
DISHWASHER – GAS
701 S Ridge Avenue, Troy, OH 45374
Page 4 of 8 F-40078 – AM Select Dishwasher
AM SELECT
AM15 Dishwasher Technical Manual Page 7 of 83
701 S Ridge Avenue, Troy, OH 45374
DISHWASHER – GAS
F-40078 – AM Select Dishwasher Page 5 of 8
AM SELECT
AM15 Dishwasher Technical Manual Page 8 of 83
DISHWASHER
ELECTRIC TANK HEAT
701 S Ridge Avenue, Troy, OH 45374
GAS TANK HEAT
Racks per Hour (Max.)
Dishes per Hour (Average 25 per rack) 1,450 1,625
Glasses per Hour (Average 45 per rack) 2,610 2,925
Inside Tank at Table Connection (Inches) 25
(H x W x D) (Inches) 66.5" x 27" x 28.5"
2 2
Gallons 14 14
Gallons per Minute - Weir Test 160 160
(For keeping power wash water hot)
Gas Burner (Regulated) Natural/LP Gas BTU/Hr.
Electric Heating Unit (Regulated) 5 kw 5 kw
Minutes operated during hour of capacity operation 9.66 10.83
Seconds of rinse per rack 10 10
Gallons per Minute - at 20 lbs. Flow Pressure 4.4 4.4
Gallons per Hour - at 20 lbs. Flow Pressure 42.9 48.1
Gallons per Rack - at 20 PSI Flow .74 - 180°F Min. .74 - 140°F Min.
if used based on 20 PSI steam - 20 PSI water owing
130°F entering water raised to 180°F min. (50°F rise) - Lbs. per Hour
Gallons per Minute (Initial rate with full tank) 38 38
450 450
Approx. lbs. - Unit only, with booster
58 65
1
⁄4" 251⁄4"
25,000 25,000
40 40
354 w/o Booster
384 w/Booster
354
Page 6 of 8 F-40078 – AM Select Dishwasher
AM SELECT
AM15 Dishwasher Technical Manual Page 9 of 83
701 S Ridge Avenue, Troy, OH 45374
DISHWASHER
F-40078 – AM Select Dishwasher Page 7 of 8
AM SELECT
AM15 Dishwasher Technical Manual Page 10 of 83
DISHWASHER
The microcomputer-based control system is built into the
AM Select dishwasher. It is available in standard electrical
specications of 208-240/60/1, 208-240/60/3, 480/60/3,
200-240/50/3, 380-415/50/3 and is equipped with a reduced
voltage pilot circuit transformer.
*CAUTION: CERTAIN MATERIALS, INCLUDING SILVER,
ALUMINUM AND PEWTER ARE ATTACKED BY SODIUM
HARDNESS MUST BE CONTROLLED TO 4-6 GRAINS FOR
CONSTRUCTION: Drawn tank, tank shelf and feet constructed
of 16 gauge stainless steel. Wash chamber and front trim panel
above motor compartment are polished, satin nish. Frame is
12 gauge stainless steel, chamber is 18 gauge, and removable
trim panels are 20 gauge.
CHAMBER LIFT: Chamber coupled by stainless steel handle,
spring counterbalanced. Chamber guided for ease of operation
and long life.
PUMP: With stainless steel pump and impeller, integral with
motor assures alignment and quiet operation. Pump shaft seal
with stainless steel parts and a carbon ceramic sealing interface.
Easily removable impeller housing permits ease of inspection.
Capacity 160 GPM. Pump is completely self-draining.
MOTOR: Built for Hobart, 2 H.P., with inherent thermal
protection, grease-packed ball bearings, splash-proof design,
ventilated. Single-phase is capacitor-start, induction-run type.
Three-phase is squirrel-cage, induction type.
MICROCOMPUTER CONTROL SYSTEM: Hobart
microcomputer controls, assembled within water-resistant
enclosure, provide built-in performance and reliability.
The microcomputer control, relays and contactors are housed
behind a stainless steel enclosure, hinged to provide easy
access for servicing. The line voltage electrical components are
completely wired with 105°C, 600V thermoplastic insulated wire
with stranded conductors and routed through listed electrical
conduit. Electrical components are wired with type ST cord.
Line disconnect switch NOT furnished.
CYCLE OPERATION: The microcomputer-timing program is
started by closing the doors, which actuates the door cycle
switch. The microcomputer energizes the wash pump motor
contactor during the wash portion of the program. After the
wash, a dwell permits the upper wash manifold to drain. At the
end of the dwell, the nal rinse solenoid valve is energized. After
the nal rinse valve closes, Sani-Dwell (Hot Water Mode only)
permits sanitization to continue. The Rinse display remains on
during this period, completing the program. If the microcomputer is interrupted during a cycle by the door-cycle switch,
the microcomputer is reset to the beginning of the program.
38
Second Wash, 2 Second Dwell, 10 Second Rinse, 7 Second
Sani-Dwell.
38 Second Wash, 2 Second Dwell, 10 Second Rinse.
Other programs can be pre-selected by your Hobart service
technician.
Manual wash cycle selector also provides selection of 2-, 4- or
6-minute wash cycles for heavier washing applications.
As continued product improvement is a policy of Hobart, specications are subject to change without notice.
701 S Ridge Avenue, Troy, OH 45374
WASH: Hobart revolving stainless steel wash arms with unrestricted openings above and below provide thorough distribution of water jets to all dishware surfaces. Arms are easily
removable for cleaning and are interchangeable. Stainless steel
tubing manifold connects upper and lower spray system.
RINSE: Rotating rinse arms, both upper and lower, feature 14
rinse nozzles. The stainless steel upper and lower rinse arms
are easily removable without tools for inspection and are
interchangeable. Diaphragm-type rinse control solenoid valve
mounted outside machine. Machine is equipped with special hot
water vacuum breaker on downstream side of rinse valve –
mounted 6" above uppermost rinse opening. Easy open brass
line strainer furnished.
FILL: Microcomputer controlled ll valve installed on upstream
side of rinse vacuum breaker. Ratio ll method is used giving
the correct ll at any owing water pressure. (20 PSIG minimum
necessary for proper rinsing.)
DRAIN AND OVERFLOW: Large bell type automatic overow
and drain valve controlled from inside of machine. Drain
automatically closed by lowering chamber. Drain seal is large
diameter, high temperature “O” ring. Cover for overow is
integral part of the standpipe.
STRAINER SYSTEM: Equipped with large, exclusive self-ushing, easily removable perforated stainless steel, one-piece
strainer and large capacity scrap basket. Submerged scrap
basket minimizes frequent removal and cleaning.
Standard tank heat is 5KW electric
_immersion heating element. Regulated power infrared gas
immersion tube system is optional at extra cost. A solid-state
igniter board controls the gas valve and provides ame ignition.
A transformer steps the control circuit voltage down to 24 volts
to power the igniter board and gas valves.
Gas Heated Dishwasher: For natural gas, gas pressure
(customer connection) not to exceed 7" W.C. For liqueed
petroleum, gas pressure to burner (customer connection) not to
exceed 11" W.C. If gas pressure is higher than 7" W.C. natural
or 11" W.C. LP, a pressure regulating valve must be supplied
(by others) in the gas line to the dishwasher. Water temperature
regulation is controlled by thermistor sensor in combination with
microcomputer controls. The tank heat and positive low water
protection microcomputer circuits are automatically activated
when the main power switch is turned “on”. If tank is accidentally drained, low water protection device automatically turns heat
off. Gas immersion tube is additionally protected by a high limit
device mounted on the surface of the tube. These features are
standard with the Hobart Microcomputer Control System.
BOOSTER HEATER: Electric booster with Sense-A-TempTM
technology adequately sized to raise 110°F inlet water to 180°F
(not available on gas heat machines).
3
ACCESSORIES: 19
Splash shield for corner installations. End of cycle audible alarm
(eld activated). Delime notication (eld activated). Desirable
functional accessories can be furnished at added cost. See
listed options and accessories on this specication sheet. Write
to the factory for special requirements not listed above.
⁄4" x 193⁄4" peg and combination dish racks.
Page 8 of 8 F-40078 – AM Select Dishwasher
F-40078 (REV. 07/09) LITHO IN U.S.A. (H-01)
AM SELECT DISHWASHERS
AM15 Dishwasher Technical Manual Page 11 of 83
MODELS
AM15 ML-130038
AM15F ML-130045
AM15T ML-130039
701 S. RIDGE AVENUE
TROY, OHIO 45374-0001
937 332-3000
www.hobartcorp.com
FORM 35320 Rev. C (Oct. 2009)
POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE
AM15 Dishwasher Technical Manual Page 12 of 83
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 VA PORS OR LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.
Model AM15 Model AM15F Model AM15T
PRESSURE
GAUGE
© HOBART CORPORATION, 2009
Fig. 1
– 2 –
TABLE OF CONTENTS
AM15 Dishwasher Technical Manual Page 13 of 83
GENERAL ..................................................................4
INSTALLATION ..............................................................5
UNPACKING ..............................................................5
INSTALLATION CODES .....................................................5
LOCATION ...............................................................5
CORNER INSTALLATION ................................................6
WATER REQUIREMENTS ....................................................7
PLUMBING CONNECTIONS .................................................8
DRAIN CONNECTION ................................................... 8
WATER CONNECTION ..................................................8
Without Electric Booster Water Heater ...................................8
With Electric Booster Water Heater ......................................8
GAS TANK HEAT (When Specied) ............................................9
VENTING REQUIREMENTS — WITH GAS TANK HEAT ........................ 10
Rate of Exhaust Flow Calculations ..................................... 11
ELECTRICAL CONNECTIONS ...............................................12
Dishwasher Without Electric Booster ................................... 12
Check Rotation (Three Phase Machines Only) ............................12
Dishwasher With Electric Booster (Separately Connected) ................... 13
Dishwasher With Electric Booster (Single Point Electrical Connection) ..........13
EQUIPMENT CONNECTIONS ............................................... 13
Vent Fan Control ................................................... 13
Remote Booster Control ............................................. 13
DETERGENT, RINSE AID, SANITIZER DISPENSERS – TUBING INSTALLATION ......... 14
Detergent Dispenser ................................................ 14
Rinse Aid Dispenser .................................................14
Chemical Sanitizer Dispenser ......................................... 14
EQUIPMENT CONNECTIONS – Detergent, Rinse Aid, Sanitizer Dispensers ............ 15
Detergent Dispenser ................................................ 15
Rinse Aid / Sanitizer Dispenser(s) ......................................15
SETUP (All Models) ........................................................ 16
Sanitizing Mode ....................................................16
End of Cycle Buzzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
OPERATION ............................................................... 17
PREPARATION ....................................................... 17
DISHWASHING .......................................................18
CLEANING ........................................................... 19
DELIME INSTRUCTIONS ................................................20
DOs AND DON’Ts FOR YOUR NEW HOBART WAREWASHER .................. 20
MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Wash Arms ........................................................21
Motor(s) ..........................................................21
Flue (Machines Equipped With Gas Tank Heat Only) ........................21
TROUBLESHOOTING ........................................................22
Manual Reset Button on Pump Motor ...................................22
SERVICE .................................................................. 24
– 3 –
Installation, Operation, and Care of
AM15 Dishwasher Technical Manual Page 14 of 83
AM SELECT DISHWASHERS
SAVE THESE INSTRUCTIONS
GENERAL
Models AM15 and AM15T dishwashers can be congured for straight through or corner operation.
Model AM15F is congured for front loading. AM15 and AM15T dishwashers are shipped from the
factory in straight-through conguration. Straight-through machines can easily be converted to corner
operation. Model AM15F includes a front-loader shelf and left- and right-side shields as standard
equipment. The front-loader shelf on AM15F can be positioned up (inside the machine during
operation) or down (outside the machine during operation).
AM15, AM15F and AM15T dishwashers are designed to operate in one of two modes: Hot water
sanitizing mode (designated by the letters “AH” or “AP” on the display when the machine is turned on),
or a chemical sanitizing mode (designated by the letters “AC” on the display when the machine is turned
on).
The serial number can be found on the machine data plate located on the bottom of the front panel.
DO NOT attempt to operate this dishwasher in the chemical sanitizing mode without a properly
installed, NSF-certied, chemical sanitizer feeder (not supplied with machine). Contact an authorized
detergent representative for information about a chemical sanitizer feeder.
The pump motor is rated 2 H.P. and has thermal overload protection.
The ll line incorporates an atmospheric vacuum breaker to prevent any reverse ow of water from the
dishwasher into the potable water supply.
The unit, once turned on, will ll the wash tank to the appropriate level and automatically stop lling
once the level is reached.
A oat, 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 8.5 KW 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 nal rinse
temperature of 180°F provided the incoming water to the booster heater is at least 110°F.
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 10 and 11 for venting and hood requirements. Verify with local codes for nal authority.
– 4 –
INSTALLATION
AM15 Dishwasher Technical Manual Page 15 of 83
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 specications on the
machine data plate; this includes the optional electric booster, if equipped. The dishwasher data plate
is located at the bottom of the front panel.
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).
LO CATION
Before nalizing 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 door.
The dishwasher must be level before any connections are made. Turn the threaded feet (Fig. 2) as
required to level the machine and adjust to the desired height.
The edge of dish table that overhangs the AM15 wash tank should be turned down and tted over the
top of the dishwasher tank (Fig. 3). Apply an NSF approved sealant between the overhang of the dish
table and the inner wall of the wash tank to prevent leakage (Fig. 3). Fasten the dish tables to the inner
wall of the wash tank with non-rusting truss head screws or rivets (Fig. 3).
For straight-through installations, clearance at the front and 15 inches out from the dishwasher at the
right side by 27 inches above the nished oor must be provided for servicing.
WASH TANK
DISH TABLE
Fig. 3
DISH TABLE
MACHINE SC REW
OR RIVE T
SEALANT
INNER WA LL OF
WASH TANK
NUT
DISH TABLE
STRAIGHT-THROUGH OPERATION SHOWN
Fig. 2
– 5 –
CORNER INSTALLATION
AM15 Dishwasher Technical Manual Page 16 of 83
Before placing the dishwasher in its operating location, check machine conguration. If the machine
is being installed in a corner (Figs. 4, 5), clearances of 20 inches out from the dishwasher under the
left-hand tabling by 27 inches above the nished oor and 15 inches out from the dishwasher at the
right side by 27 inches above the nished oor must be provided for servicing. For proper installation
of a corner machine, the control and display should be positioned at the front corner for operator access
(Fig. 5).
For corner installation, rotate the rack track so the guide rail is positioned on the left side (Fig. 6). For
corner machines, remove the front door deector (unscrew three bolts / nuts, Fig. 7).
WASH TANK
CORNER OPERATION SHOWN
DISH TABLE
DISH TABLE
MACHINE SC REW
OR RIVE T
SEALANT
INNER WA LL OF
WASH TANK
NUT
CONTROLS MUST BE ACCESSIBLE AT
FRONT CORNER.
DISH TABLE
Fig. 4 Fig. 5
Fig. 6 Fig. 7
– 6 –
A splash shield is available (at extra cost) for corner installations to cover the left side opening to the
AM15 Dishwasher Technical Manual Page 17 of 83
1
wall. Install the splash shield on the left side using the two
lockwasher and nut for each (Fig. 8) and using the two
⁄4-20 studs on the left rear corner with a
1
⁄4-20 bolts, lockwashers and nuts on the left
front corner (fasteners are provided in the kit).
For corner installations, tabling with backsplashes over 6" high require that a notch be provided to
prevent interference with the door mechanism (Fig. 9).
A NOTCH MUST BE ADDED TO BACKSPLASHES
OVER 6" HIGH ON CORNER MACHINES TO
PREVENT INTERFERENCE WITH DOOR
MECHANISM. NOTCH MUST EXTEND 5" FROM
FACE OF THE MACHINE.
Fig. 8 Fig. 9
WATER REQUIREMENTS
Proper water quality can improve warewashing performance by reducing spotting, lowering chemical
supply costs, improving productivity and extending equipment life. Local water conditions vary from
one location to another. The recommended proper water treatment for effective and efcient use of
this equipment will also vary depending on the local water conditions. Ask your municipal water
supplier for details about local water specics prior to installation.
Recommended water hardness is 3 grains of hardness per gallon or less. Chlorides must not exceed
50 parts per million. Water hardness above 3 grains per gallon should be treated by a water conditioner
(water softener or in-line treatment). Water treatment has been shown to reduce costs associated with
machine cleaning, reduce the need for deliming the dishwasher and reduce detergent usage.
Sediment, silica, chlorides or other dissolved solids may lead to a recommendation for particulate
ltration 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 ofce for specic recommendations.
– 7 –
PLUMBING CONNECTIONS
AM15 Dishwasher Technical Manual Page 18 of 83
WARNING:
PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY, SAFETY AND
PLUMBING CODES.
DRAIN CONNECTION
The drain connection is a 1
1
⁄2 " externally threaded pipe connected
straight down from the bottom of the wash tank (Fig. 10). The
connection can be made in any direction by using the proper tting
(not supplied) and routing to the appropriate drain line.
If a grease trap is required by code, it should have a minimum ow
capacity of 38 gallons per minute.
Fig. 10
WATER CONNECTION
A suitable water hammer arrestor should be installed in the water line just ahead of the dishwasher.
Without Electric Booster Water Heater
3
The water supply line is connected to the line strainer (top rear, Fig. 1) with
⁄4" pipe. A manual shutoff
valve and pipe union are required (not supplied).
REQUIRED INCOMING WATER TEMPERATURE
Model Sanitizing Mode
Without Built-in Booster Hot Water Sanitizing 180°F
Without Built-in Booster Chemical Sanitizing 120°F (49°C) 140°F (60°C)
With Built-in Booster Hot Water Sanitizing 110°F (43°C) 140°F (60°C)
Minimum Temperature Recommended Temperature
(82°C) 180°F (82°C)
Water Supply
Proper dishwasher operation requires a owing pressure of 20 ± 5 psig at the dishwasher. If the owing
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 (not installed) for verication of proper water pressure. The water
pressure is monitored when the solenoid valve is open and water is owing.
With Electric Booster Water Heater
The water supply line is connected below the booster with the line strainer (supplied) and
3
⁄4" pipe. A
manual shut off valve and pipe union are required (not supplied).
The water supply should have a minimum temperature of 110°F, and a owing pressure of 20 ± 5 psig
at the pressure gauge on top of the machine. If the owing 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.
Incoming water temperature below 110°F may require longer wash cycle time than the 57 second cycle;
refer to OPERATION, pages 17 – 18.
When the ll / nal rinse valve is on, water from the booster tank enters the dishwasher through the nal
rinse arms. During the rinse cycle, this water is 180°F. A small amount of water will likely dribble out
of the lower rinse arm into the tank between cycles due to the natural expansion of water as it is being
heated.
– 8 –
GAS TANK HEAT (When Specified)
AM15 Dishwasher Technical Manual Page 19 of 83
Check the gas data plate attached to the dishwasher or the tag attached to the incoming gas piping
for the type of gas to be used.
GAS PRESSURE SPECIFICATION
The burner is not adjustable. The maximum
owing inlet gas pressure must not exceed
the Maximum value in the table. If line
pressure exceeds the Maximum value in
the table, an additional pressure regulator
(not supplied) must be installed in the
[FLOWING GAS PRESSURE — NOT STATIC]
Type
of
Gas
Natural 25,000 3.5 7. 0 3.2
Propane 25,000 9.0 11.0 8.2
BTU/HR
Inches W.C. (Water Column) FLOWING
Incoming Line Pressure
Minimum Maximum
Manifold
Pressure
supply line.
Static inlet line pressure should not exceed 14" W.C. The minimum value is for input adjustment.
The gas valve is provided with a pressure tap to measure the gas
pressure downstream, which is also the manifold pressure. Gas
supply piping must have a sediment trap (supplied by others)
installed ahead of the dishwasher’s gas control. Connect the gas
1
supply to the
⁄2" NPT gas inlet underneath the machine (Fig. 11).
NOTE: DO NOT use Teon tape on gas line pipe threads. For
gas line pipe connections, use L
o c t i t e 565, Hobart part 546292,
or a exible sealant suitable for use with Natural and Propane
Gases.
Fig. 11
The appliance and its gas connections must be leak tested before placing the appliance in operation.
Use soapy water for leak test. DO N OT use open ame. The installation must conform with local codes,
or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (latest edition). Copies
may be obtained from American Gas Association, Inc., 1515 Wilson Boulevard, Arlington, VA 22209.
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system
1
during any pressure testing of that system at test pressures in excess of
⁄2 psig (3.45kPa).
The appliance must be isolated from the gas supply piping system by closing its individual manual
shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or
1
less than
⁄2 psig (3.45kPa).
Dissipate test pressure from the gas supply line before re-connecting the appliance and its manual
shutoff valve to the gas supply line. Caution: Failure to follow this procedure may damage the gas
valve.
The dishwasher must be installed so that the ow of combustion and ventilation air will not be
obstructed. Do not store material underneath the machine; air openings into the combustion chamber
must not be blocked. Make sure there is an adequate supply of make-up air in the room to allow for
combustion of the gas at the burner.
Keep the appliance area free and clear from all combustible substances. Do not obstruct the ow of
combustion and ventilation air. The dishwasher must have a minimum clearance from combustible
construction of 1 inch from the ue at the rear. Clearances of 20 inches out from the dishwasher at
the front (or left side in a corner installation) by 27 inches above the nished oor and 15 inches out
from the dishwasher at the right side by 27 inches above the nished oor must be provided for
servicing.
The burner is ignited automatically by solid state electronic circuitry; there is no pilot light. Gas ow
is regulated by the temperature control circuit.
– 9 –
VENTING REQUIREMENTS — WITH GAS TANK HEAT
AM15 Dishwasher Technical Manual Page 20 of 83
Hobart model AM15, AM15F or AM15T dishwashers equipped for gas tank heat are not provided with
a ue collar and are not intended to have the ue directly connected to a ventilation system. However,
the products of combustion must be vented to the outside air. The most common method of venting
is a vent hood over the entire dishwasher (Fig. 12). Refer to Rate of Exhaust Flow Calculations on the
next page for calculations of the proper vent rate for your hood. Another method is a small vent hood
(Fig. 13) positioned about ve inches above the ue exit at the rear of the dishwasher and connected
to existing ductwork. In either case, an electrical interlock must be installed to allow the ow of gas
to the dishwasher burner ONLY when the exhaust system is energized. For additional information,
refer to the National Fuel Gas Code, ANSI Z223.1, NFPA 54.
•IMPORTANT: Make sure the installation meets the local code for your area.
3" x 3" DUCT INTO
➤
CURRENT SYSTEM
➤
1' TO 4'
CLEARANCE
➤
➤
6"
MINIMUM
OVERHANG
ON ALL SIDES
➤
➤
➤
MINI VENT HOOD
18" OVERHANG
RECOMMENDED
OVER LOADING OR
UNLOADING DOORS
31⁄2"
➤
➤
➤
➤
6"
➤
MINIMUM
➤
4"
➤
➤
5" GAP
DISHWASHER FLUE EXIT
Fig. 12 Fig. 13
➤
➤
– 10 –
NOTE: Any listed and labeled factory-built
AM15 Dishwasher Technical Manual Page 21 of 83
commercial exhaust hood tested in accordance
with UL Standard 710 by a nationally recognized
testing laboratory, should be installed according
to the terms of its listing and the manufacturer’s
installation instructions.
RATE OF EXHAUST FLOW CALCULATIONS
Based on the 1996 International Mechanical Code.
The Rate of air ow required for a vent hood is
calculated using the following denitions (Fig. 14):
Q = Rate of Air Flow in Cubic Feet Per Minute
or [ CFM ] Required for the Hood.
2
A = Area of Hood Opening in Feet
= (L x W)
D = Clearance Height = Distance in Feet from
lower lip of hood to top of dishwasher
chamber.
P = Perimeter of Hood that is Open. This
depends on the hood design, as follows:
➤
CLEARANCE
HEIGHT
➤
➤
WIDTH
➤
➤
LENGTH
Fig. 14
➤
Perimeter Calculation Formula
Hood Design
Number of Open Sides
P =
Dimensions
Corner Wall Island
2 Sides Open 3 Sides Open 4 Sides Open
L + W L + W + W L + L + W + W
Feet Feet Feet
If there are four open sides (Island Design), the calculation of the Rate is as follows:
Q = 75 x A
If there are three or fewer open sides, the calculation of the Rate is as follows:
Q = 50 x A
As an alternate method, the Rate can be calculated as follows:
Q = 50 x P x D
Example:
L = 3 W = 3 D = 2
Rate Calculations
Hood Design
Number of Open Sides
Q = 75 x A
Q = 50 x A
Q = 50 x P x D
Corner Wall Island
2 Sides Open 3 Sides Open 4 Sides Open
675 CFM
450 CFM 450 CFM
600 CFM 900 CFM 1200 CFM
– 11 –
ELECTRICAL CONNECTIONS
AM15 Dishwasher Technical Manual Page 22 of 83
WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE APPLICABLE
PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL ELECTRICAL CODES.
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE (BOTH DISHWASHER AND
BOOSTER IF APPLICABLE) AND FOLLOW LOCKOUT / TAGOUT PROCEDURES.
Refer to the wiring diagram attached inside the front trim panel and to the machine data plate for service
size requirements when connecting the dishwasher. Also, refer to Electrical Data, page 12.
To access the controls area, remove the right side panel, remove the front panel and open the control
3
panel door. The dishwasher electrical service connection can be made through the 1
3
⁄4 inch trade size conduit located on the right side at the rear of the machine. By removing a
for
knockout, this hole can be enlarged to 1
3
⁄8" diameter for 1 inch trade size conduit, if required.
⁄32" diameter hole
ELECTRICAL DATA
Minimum Circuit Ampacity
Maximum Protective Device
AMPS
Models Volts / Hz / Ph Tank Heat
Dishwasher
ONLY
208 - 240 / 60 / 1
AM15
AM15F
AM15T
Compiled in accordance with the national electrical code, NFPA 70 (latest edition).
208 - 240 / 60 / 3
480 / 60 / 3
200 - 240 / 50 / 3 Electric 30 30 60
380 - 415 / 50 / 3 Electric 15 15 30
Electric 50 50
Gas 20
Electric 30 30 60
Gas 15
Electric 15 15 30
Gas 15
Optional 8.5 KW Electric Booster
8.5 KW
Booster
ONLY
Optional Single Point
Electrical Connection
3 Phase Only
Dishwasher and Booster
A fused disconnect switch or circuit breaker (not supplied) must be installed in the electrical service
line(s) supplying this dishwasher and should meet the requirements of your local electrical code.
Dishwasher Without Electric Booster
For single-phase machines, power supply connections are made to terminal blocks. For three-phase
machines connections are made to contactor lugs. The machine must be grounded according to
electrical code(s); a grounding lug is provided in the controls area. Electrical connections for machines
with gas tank heat are made to contactor 1CON in the controls area.
Check Rotation (Three-Phase Machines Only)
Three-phase motors must rotate in the direction of the arrow on
the pump housing. In order to check rotation, remove the bearing
cap to observe the motor shaft (Fig. 15). Close the machine doors
and press the power switch to ON. When the machine is completely
lled, open and close machine doors to verify that the motor shaft
rotates in the clockwise direction.
If the rotation is incorrect, DISCONNECT ELECTRICAL POWER
SUPPLY and interchange any two of the incoming power supply
leads. Reconnect the power supply and verify correct rotation.
Replace the motor bearing cap.
– 12 –
Fig. 15
Dishwasher With Electric Booster (Separately Connected)
AM15 Dishwasher Technical Manual Page 23 of 83
Single phase machines with an electric booster require two separate connections, one for the booster
and the other for the dishwasher (including motor, controls and tank heat). For single-phase machines,
all power supply connections are made to terminal blocks (Fig. 16). The single phase dishwasher is
connected to terminal block 1TB in the controls area. The single phase booster is connected to
terminal block 2TB in the controls area.
If the machine is three phase, the electrical connection for the dishwasher is made to the contactor
2CON in the controls area. The electrical connection for the three phase booster is made to the
contactor 3CON in the controls area (Fig. 17).
Dishwasher With Electric Booster (Single Point Electrical Connection)
Three phase machines congured with the optional single point electrical connection are connected
to terminal block 1TB in the controls area (Fig. 18). The machine must be grounded according to
electrical code(s); a grounding lug is provided.
Fig. 16 Fig. 17 Fig. 18
EQUIPMENT CONNECTIONS
WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE APPLICABLE
PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL ELECTRICAL CODES.
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE (BOTH DISHWASHER AND
BOOSTER IF APPLICABLE) AND FOLLOW LOCKOUT / TAGOUT PROCEDURES.
Vent Fan Control
The vent fan control feature is standard on all machines. The vent fan control relay provides switch
contacts only and does not provide power to the vent fan motor. The rating for a vent fan control relay
connected to terminals VFC1 and VFC2 is 1.5 Amps at 240 Volts maximum. When the dishwasher is
connected to the vent fan, the vent fan is switched on when the dishwasher is on, and off when the
dishwasher is off.
Remote Booster Control
The booster control feature is standard on all machines. The load rating for remote booster control
connections to BSTR1 and BSTR2 is 0.1 Amp. at 120 Volts maximum. The booster control provides
a control signal only and does not provide power to the remote booster. When a remote booster
is connected to the dishwasher, the booster is on when the dishwasher is on and off when the
dishwasher is off.
– 13 –
DETERGENT, RINSE AID, SANITIZER DISPENSERS — TUBING INSTALLATION
DETERGENT SENSOR PORT
PIPE PLUGS
AM15 Dishwasher Technical Manual Page 24 of 83
Detergent, rinse aid and / or sanitizer dispensers (not provided by Hobart) must have all connections
sealed against leakage.
The dishwasher uses 0.74 gallons of rinse water per rack at a
ow rate of 4.4 gallons per minute at 20 psig owing pressure
(equivalent to a maximum head pressure of 46 feet of water).
This information is used when setting the detergent, rinse aid
or sanitizer pumps.
Detergent Dispenser
7
The dishwasher has two
⁄8" diameter plugged holes, one on
the rear of the chamber and one on the lower part of the tank
near the pump (Fig. 19). With the tank empty, remove both
plugs to install the detergent dispenser.
• Thechamberholeisforinstallationofthedetergentfeeder
tube.
• Thelowertankholeisusedforinstallationofthedetergent
Fig. 19
sensor.
Rinse Aid Dispenser
The rinse line ange connector on top of the dishwasher has two
1
⁄8" NPT pipe plugs (Fig. 20).
• Remove the plug(s) (Fig. 20) for installation of the rinse aid
dispenser tube and / or chemical sanitizer tube, as needed.
Chemical Sanitizer Dispenser
When the dishwasher is to be operated in the chemical sanitizing
mode, the machine must be converted to low-temperature
sanitization (refer to Setup, page 16). A chemical sanitizer
dispenser that has been tested and certied by NSF International
must be installed.
• Remove the pipe plug (Fig. 20) for installation
of the chemical sanitizer tube. To assure an
unobstructed flow of sanitizer, locate the
sanitizer tube in the center of water ow by
drilling the sanitizer tube tting so that its inside
diameter is equal to the outside diameter of the
tube. Slide the tube into the ange until it
touches the opposite side and then pull it back
1
⁄4 inch (Fig. 21).
out
Fig. 20
• Rate for 6% Sodium hypochlorite (bleach) —
3 ml. within 10 seconds (maximum).
• Ratefor8.4%Sodiumhypochlorite(bleach)—
2 ml. within 10 seconds (maximum).
Fig. 21
– 14 –
EQUIPMENT CONNECTIONS — Detergent, Rinse Aid, Sanitizer Dispensers
AM15 Dishwasher Technical Manual Page 25 of 83
WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE APPLICABLE
PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL ELECTRICAL CODES.
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE (BOTH DISHWASHER AND
BOOSTER IF APPLICABLE) AND FOLLOW LOCKOUT / TAGOUT PROCEDURES.
This machine must be operated with an automatic detergent feeder and, if applicable, an automatic
chemical sanitizer feeder, including a visual means to verify that detergents and sanitizers are
delivered or a visual or audible alarm to signal if detergents and sanitizers are not available for delivery
to the respective washing and sanitizing systems. Refer to the installation section of this manual and
to the chemical feeder equipment manual(s).
Detergent Dispenser (Fig. 22)
Terminals DPS1 and DPS2 are supplied with controlled machine line voltage. They are ON during the
wash cycle and OFF between cycles or when the machine power supply is OFF. Maximum rating for
detergent dispenser connected to DPS1 and DPS2 is 1.5 Amps at line voltage. Check the machine
supply voltage and use corresponding feeder transformer voltage. Use UL listed 600 volt minimum
insulated wire for the connections. Do not use bell wire, lamp cord or similar type wire. Splice
connections, if required, must be made in the feeder transformer junction box — not in the main
7
controls enclosure. Remove
⁄8" diameter cap plug(s) for 1⁄2" trade size conduit ttings from the rear
of the enclosure. Remove the side panel. Strain relief ttings must be provided for all wiring.
Rinse Aid / Sanitizer Dispenser(s) (Fig. 22)
Terminals RPS1 and RPS2 are supplied with controlled machine line voltage and are ON during the
rinse cycle only. Maximum rating for rinse aid dispenser connected to RPS1 and RPS2 is 1.5 Amps
at line voltage. Check the machine supply voltage and use corresponding feeder transformer voltage.
Use UL listed 600 volt minimum insulated wire for the connections. Do not use bell wire, lamp cord
or similar type wire. Splice connections, if required, must be made in the feeder transformer junction
7
box (supplied by others) — not in the main controls enslosure. Remove
1
⁄2" trade size conduit ttings from the rear of the enclosure. Strain relief ttings must be provided for
⁄8" diameter cap plug(s) for
all wiring.
DETERGENT
DISPENSER
RINSE AGENT
DISPENSER
CHEMICAL
SANITIZER
DISPENSER
— VFC1
— VFC2
— BSTR1
— BSTR2
— DPS1
— DPS2
— RPS1
— RPS2
RIGHT SIDE OF
CONTROL AREA
TRANSFORMER
PRIMARY
TRANSFORMER
PRIMARY
GROUND LUG
SECONDARY
SECONDARY
Fig. 22
– 15 –
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