Market Forge ST-10 User Manual
Plus-Ten
™
PRESSURELESS STEAM COOKER
WARNING
Improper Installation, adjustment, alteration,
service, or maintenance can cause property
damage, injury, or death. Read the
installation, operating, and maintenance
instructions thoroughly before installing or
servicing this equipment.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors or liquids in the vicinity of
this or any other appliance.
MODEL
ST -10
COVERING
Installation
•
Operation
•
Service and Parts
•
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
An Employee-Owned Company
35 Garvey Street • Everett, MA 02149-4422 USA
Tel: (617) 387-4100 • Fax: (617) 387-4456
Fax Outside MA: 1-800-227-2659
E-Mail: CUSTSERV@MFII.COM
Form No. S-2486 Rev. D 12/98 Printed in U.S.A.
TABLE OF CONTENTS
PARAGRAPH PAGE PARAGRAPH PAGE
SECTION 1 INTRODUCTION
1.1 Description .......................................... 1-1
1.2 Basic Functioning................................ 1-1
1.3 Service ................................................ 1-1
SECTION 2 INSTALLATION
2.1 Assembly ............................................ 2-1
2.2 Setting in Place ................................... 2-1
2.3 Mechanical Connections ..................... 2-1
2.4 Water Connections ............................. 2-1
2.5 Installation Check-Out......................... 2-1
2.5.1 Initial Control Settings ......................... 2-2
2.5.2 Cooker Check-Out .............................. 2-2
2.5.3 Shut-Down Procedure......................... 2-2
2.6 Reversing the Doors ........................... 2-2
SECTION 3 OPERATION
3.1 Operating Controls and Indicators ...... 3-1
3.2 Operating Procedures ......................... 3-1
3.2.1 Steam Source Operation..................... 3-1
3.2.2 Preheating........................................... 3-1
3.2.3 Cooking............................................... 3-1
3.2.4 Shut-Down Procedure......................... 3-1
3.3 Cleaning.............................................. 3-2
3.4 Drainage ............................................. 3-2
3.4.1 Cooking Compartment Drainage......... 3-2
3.4.2 Drip/Spill Trough Drainage.................. 3-2
3.5 Test Kitchen Bulletin ........................... 3-3
SECTION 4 PRINCIPLES OF OPERATION
4.1 General ............................................... 4-1
4.2 Plumbing Circuits ................................ 4-1
4.2.1 Steam Inlet Line .................................. 4-1
4.2.2 Steam Exhaust and Drain Lines.......... 4-1
4.2.3 Steam Exhaust Condensing System... 4-1
4.3 Electrical Circuits................................. 4-2
4.3.1 Control Circuit Components ................ 4-3
4.3.1.1 60 Minute Timer .................................. 4-3
4.3.1.2 Indicator Lights .................................... 4-3
4.3.1.3 Buzzer ................................................. 4-3
4.3.1.4 Door Interlock Switch .......................... 4-3
4.3.1.5 Thermostatic Switch ............................ 4-3
SECTION 5 TROUBLE-SHOOTING
5.1 General ............................................... 5-1
5.2 Trouble-Shooting Guides .................... 5-1
5.3 Electrical Fault Isolation ...................... 5-1
5.4 Electrical Trouble-Shooting
Procedures ..................................... 5-1
5.4.1 Incoming Power .................................. 5-2
5.4.2 Electrical Inspection ............................ 5-2
5.4.4 60-Minute Timer .................................. 5-3
5.4.4.1 Timer Contacts .................................... 5-3
5.4.4.2 Timer Motor ......................................... 5-3
5.4.5 Door Interlock Switch .......................... 5-5
5.4.6 Steam Solenoid Valves ....................... 5-5
5.4.7 Indicator Lights.................................... 5-5
5.4.8 Cooking Compartment Thermostatic
Switch ............................................. 5-5
5.4.9 Buzzer................................................. 5-5
5.4.10 Cold Water Condenser Circuit ............ 5-6
5.4.11 Wiring.................................................. 5-6
SECTION 6 MAINTENANCE
6.1 General ............................................... 6-1
6.2 Preventive Maintenance ...................... 6-1
6.2.1 Cooking Compartment Cleaning ......... 6-1
6.3 Repair and Replacement .................... 6-1
6.3.1 Door Latch Tension Adjustment.......... 6-1
6.3.2 Door Handle Tension Adjustment ....... 6-2
6.3.3 Door Gasket Replacement.................. 6-2
6.3.4 Exterior Panel Removal ...................... 6-2
6.3.5 Steam and Water Solenoid Valve
Replacement................................... 6-2
SECTION 7 ILLUSTRATED PARTS LIST
7.1 General ............................................... 7-1
7.2 Ordering Information ........................... 7-1
7.3 Index of Illustrated Parts List............... 7-1
7.4 Illustrated Parts List.................7-2 thru7-6
iii
LIST OF ILLUSTRATIONS
FIGURE PAGE FIGURE PAGE
SECTION 2 INSTALLATION
2-1 Typical door layout.............................. 2-3
SECTION 3 OPERATION
3-1 Controls and Indicators ....................... 3-2
SECTION 4 PRINCIPLES OF OPERATION
4-1 Pictorial Diagram—
Steam and Water Circuits ............... 4-2
SECTION 5 TROUBLE-SHOOTING
5-1 Wiring Diagram, Model ST-10 ............. 5-4
5-2 Schematic Diagram, Model ST-10 ...... 5-7
SECTION 7 ILLUSTRATED PARTS LIST
7-1 Cabinet Assembly ............................... 7-3
7-2 Door Assembly .................................... 7-4
7-3 Control Panel Assembly...................... 7-5
7-4 Condenser Assembly.......................... 7-6
LIST OF TABLES
TABLE PAGE TABLE PAGE
SECTION 3 OPERATION
3-1 Controls and Indicators ....................... 3-3
SECTION 5 TROUBLE-SHOOTING
5-1 General Trouble-Shooting Guide ........ 5-1
5-2 Electrical Fault Isolation Guide............ 5-3
iv
1. INTRODUCTION
This service and parts manual contains general information, installation operation, principles of
operation, trouble-shooting, and maintenance information for the Market Forge ST-10 Pressureless
Steam Cookers. Also included is a parts list in which each replaceable part is identified and shown
in an accompanying exploded view.
1.1 DESCRIPTION
The ST-10 is a pressureless steam cooker consisting
of two independently controlled compartments enclosed
in a single cabinet. Each compartment is equipped with
a separate three-piece door with inner gasket plate isolated from the exterior surface. Door latches operate by
action for positive sealing of inner door. Steam and
steam-condensing circuits are electrically controlled. Operating controls are displayed on a single front-mounted
panel and include separate timers with indicator lights
for selection of constant steam or 60-minute-long duration cooking.
A separate steam source required for operation of the
Pressureless Cooker is normally purchased with it,
please refer to the respective manual for guidance.
1.2 BASIC FUNCTIONING
The Model ST-10 may be operated with only one compartment in use; or both may be used simultaneously.
Each compartment is equipped with identical controls,
allowing selection of constant steam or 60-minute timer
operation. The cooker becomes operational when it is
set to constant steam, or the timer is set at the desired
cooking time and the compartment door is closed. The
indicator light comes on and the steam solenoid valve
opens, allowing steam to flow into the compartment.
When steam flowing inside the compartment has
raised the interior temperature to 195°F, the contacts of
a thermostatic switch automatically close, completing the
circuit to the timer motor and starting the cooking time
period. At the end of the set interval, timer contacts
switch to shut off the cooking operation and sound a
signal buzzer. The buzzer is silenced by returning the
timer dial to the OFF position. In the constant steam
mode, operation will be continuous.
Steam emitted from the compartment along with liquid cooking drainage is directed through a drain screen
inside the compartment into the cooker drain line. A cold
water solenoid valve connected into the cooker drain
line is automatically actuated by a thermostatic switch
in the boiler drain to condense the steam to water prior
to discharge into the boiler drain.
1.3 SERVICE
Required service, both preventive and corrective, is
explained in Section 6. Should repairs be required, a
network of authorized agencies is available to assist
with prompt service. A current Directory of Authorized
Service Agencies may be obtained by contacting:
Product Service Department
Market Forge
35 Garvey Street
Everett, Massachusetts 02149
Telephone (617) 387-4100
The model and serial numbers must be referenced
when corresponding with Market Forge. The data plate
containing the serial number pertaining to the equipment is located on the lower front trim of the cabinet.
1-1
2. INSTALLATION
2.1 ASSEMBLY
The Pressureless Cooker is factory-mounted on a
cabinet base containing either a steam boiler or direct
steam connection controls for the cooker. The assembled
unit is shipped bolted to a skid, with cabinet feet in a
separate container. Steps required for assembly are as
follows:
1. Remove the four bolts that fasten the equipment
frame to the skid.
2. Install feet in threaded mounting locations of the
cabinet frame.
3. Mount the two baffles on studs located on the rightinside of the cooking compartments.
4. Mount the four pan support racks in brackets inside control compartments.
5. Attach panels to lower cabinet. Detailed instructions
are enclosed with the panels.
6. Attach the drip trough on studs located on the face
of the unit.
2.2 SETTING IN PLACE
trical and plumbing connections are routed to the steam
boiler cabinet through the 6-inch-high space between the
floor and the bottom edge of the cabinet frame. Connection locations for the cooker mounted on steam boilers of
electric, gas, and steam coil utility and direct-connected
steam are shown in separate installation instructions for
each.
2.4 WATER CONNECTIONS
Before connecting water to this unit, have water sup-
ply analyzed to make sure that hardness is no grater than
2.0 grains per gallon and pH level is within the range of
7.0–8.5. Water that fails to meet these standards should
be treated by the installation of a water conditioner.
EQUIPMENT FAILURE CAUSED BY
INADEQUATE WATER QUALITY IS NOT
COVERED UNDER WARRANTY.
CAUTION
PVC or CPVC are not acceptable materials for
drains.
The location of installation must be under an exhaust
hood, which will remove small amounts of water vapor
emitted when the cooker doors are opened, and exhaust
fumes from the air. Level the unit in final location by turning the adjustable feet. Using the cabinet top as a reference, obtain level adjustment left-to-right and
front-to-back.
2.3 MECHANICAL CONNECTIONS
Since the Pressureless Cooker is interconnected at
the factory to the steam boiler or direct steam plumbing,
no field connections to the cooker are required. All elec-
2.5 INSTALLATION CHECK-OUT
Check-out procedures for the cooker mounted on
steam boilers of electric, gas, and steam coil utility or direct-connected steam are given in separate installation
instructions for each. Procedures for the cooker only are
included in Subsection 2.4.2. If the cooker fails to perform as described, consult Table 5-1 of the TroubleShooting Guide for corrective action. If difficulty arises with
the boiler, reference the separate service and parts
manual for that equipment.
Before making this check-out, the operator must be
thoroughly familiar with the operating procedures in Section 3 and with the function of each control described in
Table 3-1. Reference Figure 3-1 for identification of controls required in the following procedures.
2-1
2. INSTALLATION (CONT.)
2.5.1 Initial Control Settings
Before beginning the start-up procedures for the
cooker, the instruction plate and service manual for the
steam boiler must be consulted and all start-up procedures completed to supply 15 PSI steam to the steam
inlet line for the cooker.
1. All steam boiler controls are in the operating mode
and 15 PSI steam is applied to the cooker inlet
plumbing.
2. Cooker timers for both compartments (Figure 3-1)
are in the OFF position.
3. Cooker compartments are empty of all information
materials, pan supports are mounted in place, and
doors are open.
2.5.2 Cooker Check-Out
The cooker check-out procedures are as follows:
1. With the doors open set timers to about the
“4-minute” position. Observe that indicator lights are
off and steam does not enter compartments.
2. Close cooker compartment doors. Observe that indicator lights turn on, and steam can be heard rushing into the compartment simultaneously with the
door closing.
3. Observe the boiler drain line for passage of steam
into the open floor drain. Correct steam condenser
operation is evidenced by presence of water flowing from the drain line.
4. Observe cooker operation for several minutes. Operation is correct if timer dials begin to rotate after a
short delay period required for preheating. After the
delay period plus the “4-minute” initial setting, the
timer dials will return to the “0-Minute” position, at
which a buzzer sounds. The buzzer is silenced by
turning the dial to the OFF position.
2.5.3 Shut-Down Procedure
No shut-down procedure is required for the Pressureless Cooker except to check that all timer dials (2) are in
the OFF position and the compartment doors are open.
Consult the steam boiler instruction plate and complete
the shut-down procedures for the boiler.
2.6 REVERSING THE DOORS
The Pressureless Steam Cooker has a reversible
cooking compartment door. This section contains instructions for reversing this door.
1.Turn off power to the unit.
2.Open the cooking compartment door
3.Remove the two screws that attach the top hinge to
the front of the unit.
4.Slide the door upwards, off the bottom hinge.
5.Remove the two screws that attach the bottom hinge
to the front of the units.
6. Remove the right and left side panels by unscrewing
the 1 screw on each panel and sliding the panel
down.
7. Remove the door interlock assembly by unscrewing
the two nuts that hold it in place (assembly is attached to the screws in the top right hinge mounting holes, see fig. 2-1).
8. Remove the four screws in the right side hinge mount-
ing holes and install them in the left side hinge
mounting holes (where the hinges were originally
mounted).
9. Using the nuts removed in step #6, reinstall the door
interlock assembly onto the 2 screws in the lower
left hinge mounting holes (see fig. 2-1) with by
moving the assembly over the cooking cavity to
the other side of the unit. Rotate the door inter-
lock assembly 180° for installation, so that the
switch is now facing up.
10. Reinstall the top hinge and screws into the right
lower hinge mounting holes. Rotate the hinge
180° for installation, so that the pin which the
door rides on is now facing up. The hinge must be
rotated because it will now function as the bottom
hinge. DO NOT COMPLETELY TIGHTEN THE
HINGE MOUNTING SCREWS YET. These will
be used later for adjusting the door.
11.Remove the door latch assembly from the face of
the unit. The 2 nuts mounting the door latch are
located behind the face of the unit and must be
accessed where the right side panel was removed.
12.Remove the two white hole plugs from the left door
latch mounting holes, and insert them into the right
door latch mounting holes (where the door latch
assembly was originally mounted).
2-2
2. INSTALLATION (CONT.)
13.Rotate the door latch assembly 180°, and install
into the left door latch mounting holes.
NOTE: Each stud on the latch assembly should
have a plastic washer, a spring, a plastic
washer and a Nyloc type nut,
14. To adjust the tension of the door latch, tighten both
nuts down until the springs are fully compressed,
then back each nut off 1 1/2 turn.
15. Rotate the door 180° for mounting.
16. Slide the remaining hinge into the top door bearing.
17. Slide the door and hinge assembly down onto the
hinge which you have already mounted to the front
of the unit. Use the two screws to mount the top
hinge into the right upper hinge mounting holes.
DO NOT COMPLETELY TIGHTEN THE HINGE
MOUNTING SCREWS YET.
18. Slowly push the cooking compartment door closed
until it is latched.
19. The cooking compartment door can now be raised,
lowered, and/or rotated into position by bumping
it with the palm of your hand or by using a small
rubber mallet.
20. First, check the alignment at the front of the door by
making sure that the striker in the door is centered with the latch mechanism on the front of the
unit.
21. Square the door to the unit by raising or lowering
the hinge side of the door, keeping the latch centered with the striker.
22. Visually inspect the door. Be sure that the door is
square to the unit, the striker is centered with the
latch, and the gasket is in contact with the entire
lip of the cooking compartment.
23. Gently open the cooking compartment door, taking
care not to move it out of position.
24. Tighten all 4 door hinge bracket mounting screws.
25. Close and visually inspect the door again, as described in step 22.
26. Reinstall the left and right side panels, using the
screws for each panel.
TOP LEFT HINGE
MOUNTING HOLES
LEFT DOOR LATCH
MOUNTING HOLES
INTERLOCK ASSEMBLY
POSITION WHEN DOOR IS
REVERSED
LOWER LEFT HINGE
MOUNTING HOLES
TOP RIGHT HINGE
MOUNTING HOLES
INTERLOCK ASSEMBLY
ORIGINAL POSITION
DOOR LATCH ASSEMBLY
ORIGINAL POSITION
LOWER RIGHT HINGE
MOUNTING HOLES
Figure 2-1. TYPICAL DOOR LAYOUT
2-3
3. OPERATION
3.1 OPERATING CONTROLS AND
INDICATORS
The controls and indicators required to operate the
Pressureless Steam Cooker are listed in Table 3-1,
together with a short functional description of each.
Figure 3-1 shows the physical location of each control
and indicator.
3.2 OPERATING PROCEDURES
The ST-10 Pressureless Steam Cooker defrosts frozen foods and cooks fresh and defrosted foods. Each
cooking compartment permits selection of continuous
(constant steam) cooking or timed (0–60 minutes) cooking. Instructions for operation are included in this section. Consult Test Kitchen Bulletin for detailed cooking
information.
3.2.1 Steam Source Operation
The Pressureless Cooker is supplied mounted on a
cabinet containing either a steam boiler or controls for
direct-connected steam. Manual controls are accessed
by opening the cabinet door. The start-up procedure
for the steam source is completed once before each
daily operating period of the cooker. (For steam boilers, see instruction plate.)
3.2.2 Preheating
Before each initial operation of the cooker, and at
any other time when the cooking compartment is cold,
a 1-minute preheating period is required. To preheat
the cooker, put steam source into operation and proceed as follows:
1. Close cooking compartment door.
2. Set 60-Minute Timer Dial (1) to “1-minute” setting.
3. Turn off buzzer, which sounds to indicate cooking
is complete, by setting the Timer Dial (1) to OFF
position.
3.2.3 Cooking
Before loading the cooker, be sure compartment is
hot. See Subsection 3.2.2 for preheating instructions.
1. Slide pans of food into cooking compartment pan
supports.
2. Close cooking compartment door.
3. Set timer cooking time:
a. CONSTANT STEAM—for continuous cooking
b. 60-MINUTE TIMER—for timed cooking.
4. Set appropriate timer to the required cooking time
(see Test Kitchen Bulletin #59).
5. Turn off buzzer, which sounds to indicate cooking
is complete, by setting timer dial (1) to the OFF
position.
6. Open door sightly at first letting most of the steam
out of the compartment and then fully open the
door.
7. Unload by sliding pans of food from pan supports,
taking care to avoid hitting compartment opening.
3.2.4 Shut-Down Procedure
No shut-down procedure is required for the cooker
except to check that both timer dials (1) are in the OFF
position and that both compartment doors are open.
When all cooking has been completed for the day, the
steam source must be shut off. (For steam boilers, see
instruction plate.)
CAUTION
When the unit is not in use, leave the cooking
compartment door slightly ajar to prolong the
life of the door gasket.
NOTE
Total elapsed preheating time equals the
timer setting plus a short delay period
needed to active a thermostatic switch included in the controls.
3-1
3. OPERATION (CONT.)
3.3 Cleaning
After each period of daily operation (more frequently
as required to maintain cleanliness), the cooker should
PILOT
LIGHT
be thoroughly cleaned by completing the following
steps:
C
O
N
S
F
T
F
O
A
N
S
T
T
E
A
M
0
60
5
2
55
10
50
15
45
20
40
25
35
30
1
1. Remove left- and right-side pan supports, baffles,
and drain screens by lifting up and off mounting
studs. Wash with a mild detergent. Rinse and set
aside for reassembly.
2. Wash cooking compartment interior using a mild
detergent and water. Rinse and dry thoroughly.
3. Replace pan supports, baffles, and drain screens
in compartment and leave door open.
PLUS-TEN
PILOT
LIGHT
3.4 DRAINAGE
3.4.1 Cooking Compartment Drainage
The bottom of the cooking compartment is angled
C
O
N
S
F
T
F
O
A
N
S
T
T
E
A
M
0
60
5
2
55
10
50
15
45
20
40
25
35
30
slightly toward the rear of the unit. This assures that
any condensate build-up or spills will be directed toward the drain hole, which is located at the rear bottom
center of the cooking compartment. Any liquid exiting
1
the cooking compartment runs down the cooking compartment drain tube and into the drain line.
CONVECTION
STEAM
COOKER
3.4.2 Drip/Spill Trough Drainage
The ST-10 Pressureless Steam Cooker has a drip/
spill trough below the cooking compartment door. It will
catch any condensate gathering on the front of the unit
Figure 3-1. Controls and Indicators
when the door is opened.
TABLE 3-1
CONTROLS AND INDICATORS
(See Figure 3-1)
FIG. 3-1 REF. DESCRIPTION FUNCTION
1 Timer/Constant Steam Controls cooking up to 60 minutes or uses constant operation.
2 Indicator Light (red) Indicates when lit that cooker is in operation.
3 Buzzer Signals end of cooking period (not shown).
3-2
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