Market Forge ST-AG Service Manual

SERVICE &

PARTS MANUAL

STEAM·IT, STYLE F

GAS OPERATED COOKER

MODELST·AG

Form Number S2127 Printed in U.S.A. Copyright 1977

An

Employee Owned Company

35 Garvey Street, Everett, MA 02149-4403

TABLE OF CONTENTS

!'!'.l.;·.1

SECTION 1 INTRODUCTION

1.1 Description .

1.2 Basic Functioning .

1.3 Service.

SECTION 2 INSTALLATION

2.1 Unpacking and Assembly .

2.2 Setting in Place .

2.3 Gas Connection .

2.3.1 Pressure Regulator Setting .

2.3.2 Canadian Gas Connections .

2.4 Electrical Connection .

2.5 Water and Drain Connections .

2.6 Installation Checkout .

2.6.1 Initial Control Setting .

2.6.2 Cooker Checkout .

2.6.3 Shutdown Procedure .

SECTION 3 OPERATION

3.1 Operating Controls and
Indicators .

3.2 Operating Procedures .

3.2.1 Preliminary Procedures .

3.2.2 Preheating .

3.2.3 Cooking Procedures ...

3.2.4 Low Water Cut-Off Operation .

3.2.5 Shut-Down Procedure .

3.3 Cleaning .

3.3.1 Exhaust Silencer .

SECTION 4 PRINCIPLES OF OPERATION

4.1 General .

4.2 Detailed Operation .

4.3 Steam Circuit. . .. . .

4.3.1 Steam Trap .

4.3.2 Pressure Switches .

4.3.3 Steam Pressure Gauge and

Safety Relief Valve .

4.3.4 Steam Exhaust Valve and
Silencer .

4.4 Electrical Circuits .

4.4.1 Control Circuit Components .

1·1
1·1

1.,

2·1
2·1

2·'

2·1
2-1
2·2
2-2
2·2
2-2

2·3

2-3

3-1

3·'

3-1

3·,

3-1
3-3
3-4
3-4
3-4

4-1
4-1

4-1

4·1
4·1

4-1

4-1
4-2
4-2

I .• ".

SECTION 5 TROUBLE-SHOOTING

5.1 General. . . . . . 5·1

5.2 Trouble-Shooting Guides. . . . . .. 5·'

5.3 Electrical Fault Isolation. . . 5·1
54 Electrical Trouble-Shooting

Procedures. . . . . . . . . . . . 5·3

5.4.1 Incoming Power. . . . . . . . . . . . . .. 5·3

5.4.2 Electrical Inspection . . . . . . . 5-5

5.4.3 Direct Spark Ignition Control

System . . . . . . . . . . . . . . 5·5

5.4.4 50-Minute Timer. . . . . . . . . . . . . 5-7

54.5 Solenoid Gas Valve. . . . . . . . . 5-7

5.4.6 Buzzer. . . . . . . . . . . . . . . . . . . . . .. 5-7

5.4.7 Indicator Light.. . ... . .. .... . 5-7

5.4.8 Wiring . . . . . . . . . . 5-8

SECTION 5 MAINTENANCE

6.1 General... . . . . . . . .. 6-1

6.2 Preventive Maintenance. . . . . . .. 6-1

62.1 Door Disassembly and Cleaning. 6-1

6.2.2 Safety Valve Check. . . 6-2

62.3 Door Fulcrum and Drain Cleaning

and Lubrication. . . . . . . . . . . . . .. 6-2

6.2.4 Cooki ng Compartment. . . . . . . .. 6-2

6.2.5 General Inspection . . . . . . . . . . .. 6-2

6.3 Repair and Replacement. . . . . . .. 6-3

6.3.1 Door Assembly. . . . . . . . . . . . . . .. 6-3

6.3.2 Exterior Panel Removal. . . . . . . .. 6-4

6.3.3 Steam Exhaust Valve and Trap

Replacement. . . . . . . . . . . . . . . .. 6-4

6.3.4 Direct Spark Ignition System. . .. 6-4

6.4 Adjustments and Operational

Checks. . . . . . . . . . . . . . . . . . . . .. 6-5

6.4.1 Gas Burners and Pressure

Regulator. . . . . . . . . . . . . . . . . . .. 6-5

6.4.2 Electrode Assembly. . . . . . . . . . .. 6-5

6.4.3 Solenoid Gas Valve. . . . . . . . . . .. 6-5

6.4.4 Timer and Gas Control Switches. 6-5

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

III

S2127

LIST OF ILLUSTRATIONS

Paoe

SECTION 1 INTRODUCTION

1-1 Model ST-AG Steam-It Cooker ... 1-2

SECTION 2 INSTALLATION
2-1 Installation of Gas Shutoff Valve. 2-2

SECTION 3 OPERATION
3-1 Steam-It Controls and Indicators. 3-2

3-2 Drain Plug. . . . . . . . . . . . . . . . . . .. 3-4

3-3 Pan Support Removal. . . . . . . . .. 3-4

SECTION 4 PRINCIPLES OF OPERATION

4-1 Steam and Gas Circuits. . . . . . .. 4-2

4-2 Pictorial Diagram, Electric

Circuits, 120V 4-3

SECTION 5 TROUBLE-SHOOTING
5-1 Wiring Diagram, Steam-It, 120V,

60 Hz 5-4

5-2 Schematic Diagram, Steam-It,

120V 5-5

5-3 Placement of Flame Current

Meter. . . . . . . . . . . . . . . . . . . . . . .. 5-6

SECTION 6 MAINTENANCE

6-1 Door Spring Disengagement. . .. 6-1

6-2 Door Removal. . . . . . . . . . . . . . . .. 6-2

6-3 Gasket Removal. . . . . . . . . . . . . .. 6-2

6-4 Door Seal Tension Adjustment. .. 6-3
6-5 Air Shutter Adjustment _. 6-5

6-6 Gas Regulator Adjustment. . . . .. 6-5

SECTION 7 ILLUSTRATED PARTS LIST
7-1 Cabinet and Frame Assembly ... 7-2
7-2 Steam Exhaust Valve Assembly .. 7-5
7-3 Burner Chassis Subassembly. " 7-6

7-4 Door Assembly. . . . . . . . . . . . . . .. 7-8

7-5 Door Latch Assembly. . . . . . . . .. 7-9

7-6 Fulcrum and Drain Assembly. . .. 7-10

LIST OF TABLES

Table

SECTION 3 OPERATION

3-1 Controls and Indicators. . . . . . .. 3-3

SECTION 5TROUBLE-SHOOTING

S2127

Page

Table

5-1 Operator's Trouble-Shooting

Guide 5-1

5-2 General Trouble-Shooting Guide. 5·2

5-3 Electrical Fault Isolation Guide.. 5·3

iv

Page

SECTION 1 INTRODUCTION

.-~~-- ...-~~.~-.-=-:::-::~=-=-=~-=-=-:~-::::-:::-=-=-=-::-::-:'-~;-::-:-:--;-:---:---;--;-;----;-:------:-7-~--'----'

This service and parts manual contains general information, installation, operation, principles
of operation, trouble-shooting, and maintenance information for the Market Forge Steam-It,
Style F,Gas

IS Identified and shown in an accompanying exploded view.

Operated,

Model ST-AG. Also included is a parts list in which each replaceable part

1.1 DESCRIPTION
The Market Forge Model ST-AG Steam-It

Cooker is a gas fired pilotless, direct spark
ignition system cooker. The unit is designed
to operate from a natural, propane, butane or
manufactured gas supply. It consists of a
cooking compartment fitted with electrically
controlled steam circuits for application of
steam for the duration selected by the
operator. The cooking compartment and all
control components are enclosed within
stainless steel cover panels with operator
controls displayed on a front mounted panel.
(See Figure 1-1)

The major assemblies of the Model ST-AG

steam cooker are, the stainless steel cabinet
enclosure, a cooking compartment with pan
supports for cooking trays, the gas burner
and ignition control assembly for the direct
spark electrode, and a steam exhaust valve
assembly. Located on the lower front panel is
a 50-minute timer with a pilot light (red) "on"
indicator and a reset switch marked RESET.

The RESET switch is used to re-cycle the unit

in the event of shut off during a cooking
period.

The unit is designed to be mounted on a

stand which is offered and highly recom­mended as an optional unit. However, the

Steam-It unit may be mounted on any heat-

resistant table, counter top etc. as long as

certain clearance from combustible

materials are maintained (refer to Section 2
for complete installation instructions) and
the unit is perfectly level.

As the pressure builds up, cold air is
forced out of the cylinder through the ther­mostatic steam trap. The air will continue to
escape as pressure builds up and the steam
trap will close after all the air has been forc-

ed out of the cooking compartment. When
the pressure reaches approximately 9-10
psi,the contact on the pressure switch will
close, thereby closing the circuit to the clock
motor and starting the actual cooking time

period. When the pressure in the cooking
compartment reaches 15 psi, the contacts on
the pressure switch will open. These con­tacts will shut off gas to the main burner
when they are open, causing the pressure to
stop rising. When the cooking compartment
cools and the pressure drops to 13 psi, the
contacts on the pressure switch will close
gas will flow to the main burner and be re- ig:
nited by the electrodes. Any number of such
"OFF" and "ON" cycles might occur during
the selected cooking time.

1.3

SERVICE

Required service, both preventive and cor­rective, is explained in Section 5. 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

1.2 BASIC FUNCTIONING

The Model ST-AG steam cooker becomes
operational when water is loaded into the
cooking compartment and the 60-minute
timer is set to the desired cooking time. With
the time set, the electric ignition comes on,

the exhaust valve closes automatically and
the burner ignitor is energized. The gas is ig-

nited by the electrodes to heat the water in

the cooking cylinder.

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 front top of the cabinet.

1·1

S2127

SECTION 2 INSTALLATION

2.1 UNPACKING AND ASSEMBLY
The Stearn-It cooker is shipped in a carton

with protective padding and mounted on a
wooden pallet. Carefully remove the carton,
padding and the bolts securing the unit to
the wooden pallet. Inspect assemblies as
follows:

1. Inspect unit overall for dents or
deformations in stainless steel
cabinet enclosures.

2. Make sure visible attaching hardware
for all assemblies are not missing or
damaged.

3. Inspect timer, indicator light, RESET
switch and pressure gauge to see they
are not damaged.

4. Remove caplug from door handle and
install handle.

5. Install pan supports so that the
horizontal keyhole is at the rear of the
cooking chamber and so that the
flange and embossments face the
middle of the chamber.

NOTE

The cooker is carefully inspected and

packaged before leaving the factory. If
there are missing components or unit
is damaged, notify the carrier or dealer
immediately.

2.2 SETTING IN PLACE
If possible, a location should be selected

under an exhaust hood which will remove
small amounts of water vapor emitted when
the cooker door is opened. Level the unit in
final location, using the cabinet top as a

reference to obtain level adjustment left-to­right and tront-to-back.

NOTE

If the Steam-It cooker is installed
without the optional stand, it may be
set on a heat-resistive table, counter
or back bar. The minimum clearance
from combustible construction must
be 2 inches from left side, 12 inches
from right side and 2 inches from
back.

2.3 GAS CONNECTION
The gas connection is made by removing

the lower front panel to gain access to the
gas supply line elbow (Figure 7-3, Index 37).

WARNING

Gas lines should be thoroughly blown
out and cleaned before connection to
the Steam-It is made. This will prevent
dirt, dust or pipe compound from
reaching the sensitive gas solenoid
valve.

Installation must conform with the

National Fuel Gas Code, ANSI Z223.1-1974.
The gas line should not be smaller than 3/8­inch pipe. A gas shutoff valve is supplied
with the unit and must be installed as close
as possible to the gas connection of the
Steam-It, adjacent to the outside of the unit.
(Refer to Figure 2-1.)

2.3.1

Pressure Regulator Setting

The pressure regulator must be set to the

proper flow, depending upon the type of gas
used. Setting is as follows:

1. Remove pressure regulator access
cover (Figure 7-1, Index 29) and remove
cap from pressure regulator (Figure
7-3 Index 39).

2. For natural or manufactured gas
supply, set regulator at 4.0·inch W.C.
(See Subsection 6.4.1.)

3. For propane or butane gas supply set
regulator at 10.0-inch W.C. (See
Subsection 6.4.1.)

4. Reinstall protective cap.

5. Check to see that proper burner
orifices are installed. Use a #47 OMS
(yellow) for natural gas; a #55 OMS
(purple) for propane or butane gases; a
#31 OMS (brown) for manufactured
gas. Refer to Figure 7-3, Index 43,44
and 45 for proper part numbers.

2.3.2 Canadian Gas Connections
Special instructions are required for in-

stalling the Steam-It cooker in Canada. In­structions are as follows:

2·'

SZ127

2·2

SHORT NIPPLE

UNION (BY OTHERS)

----- GAS VALVE 3/8" NPT

SIDE CONNECTION

ST·AG STEAM·IT COOKER

UNION (BY
OTHERS)

Figure 2·1

tnstetteuon

1. Installations in Canada are to be
conducted in accordance with C.S.A.
Standard B149 (Gas Installation
Code), C.S.A. Standard C22.1 (Elec­trical Installation Code) and/or Local
Codes.

2. The minimum size supply pipe when
used with Natural Gas is 1/2-inch
N.P.T.

2.4 ELECTRICAL CONNECTION

Connect 120 volt aCt single phase (2 amp)
60 Hz power supply to the terminal box as
follows:

1. Remove terminal box cover (Figure
7-1, Index 13).

2. Disconnect power from main power
source and connect input power wires
to terminals L1 and L2. Neutral wire
connects to terminal L2 and hot wire
to L1 (refer to wiring diagram, Figure
5-1.)

WARNING

Be sure to ground unit chassis from
ground terminal box to an outside
ground.

BOTTOM CONNECTION

of Gas Shutoff Valve

2.5 WATER AND DRAIN CONNECTIONS

The Stearn-lt cooker design incorporates
provisions for manually adding and draining
water, therefore no external connections for
water and drain are required.

2.6 INSTALLATION CHECKOUT

After the Steam-It cooker is completely
assembled and properly located with elec­trical and gas supply connected, the cooker
must be given a thorough checkout before
being put into cooking operation.

Before making this checkout 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 identifica-

tion of controls required in the following pro­cedures. If the unit fails to perform as
described below, consult Tables 5-1 and 5-2
of the troubleshooting guides for corrective
action.

2.6.1

Initial Control Settings

Before beginning cooker checkout pro­cedures, perform the following steps:

S2127

INTRODUCTION

1.

Check to see that

120

volt ac. single
phase 60 Hz power is available from
power source and properly connected
to unit terminal box.

2. Check to see that the gas supply line
shutoff valve is closed.

3. Check to see that the timer is off

4 Visually check interior of cooking

compartment and remove any
materials, papers, etc. Check to see
that pan supports are properly install-

2.1

ed (refer to par aqraph

step 5) and

secured.

5 Check pressure gauge to see that it

registers zero pounds.

2.6.2

Cooker Checkout

The cooker checkout procedures are as
follows:

1. Secure drain plug (Figure 7-6, Index

18), then pour 6 quarts of water into

Steam-It cooking compartment
through the door opening.

2. Close the door and lock in position by
placing the tongue of the door lock
under the roller on the drain casting
and pressing downward until door
lock comes to a firm stop. This lock
makes the initial seal. (When steam
pressure builds up in the compart­ment it will force the door to a tighter
closed position.)

3. Open gas shut-off valve.

4. Turn the Steam-It on by setting the
timer to the desired cooking time.
Observe pressure increase indicated
by pressure gauge.

5. At the close of the preset cooking
period, the timer pointer will stop at
the "0" position on the dial. This will
shut down the Steam-It and
automatically open the exhaust valve.

The Buzzer will continue to sound un-

til the dial pointer is manually turned

to the "OFF" position.

6. Observe that the indicator light

(Figure 3·1, Item 2) goes out when
timer is at the "O·minute" position.

7. Check the pressure gauge to see that

the pressure reads zero.

8. The door will not open while there is

steam pressure working against it
from within the cooking compartment.
The door must be kept locked until the
cooking cycle has completely finish­ed, then the door opened to allow
vapor to clear.

9. Shut off gas supply by closing the gas
shutoff valve.

2.6.3

Shutdown Procedure

No special shutdown procedures are

required with the exception that the door is

left open, timer must be in the OFF position

and the gas supply valve closed, (consult

local codes for daily shut-off requirement.)

NOTE

Before using the Steam-It for cooking,
it is recommended that checkout
operations be performed 2 or 3 times
in order to determine that it is working
properly and to insure cleanliness of
the cooking compartment.

23

S2127

SECTION 3 OPERATION

3.1

OPERATING CONTROLS AND
INDICATORS

The controls required to operate the
Steam-It cooker are listed in Table 3-1,
together with a functional description of
each. Figure 3-1 shows the physical location
of each control and indicator.

3.2

OPERATING PROCEDURES

The following paragraphs outline the
sequence of daily operation for the Steam-It
Model ST-AG cooker. The checkout pro­cedures outlined in Section 2 should be per­formed prior to daily use for cooking. If any
malfunction develops during the normal use
of the cooker, refer to the troubleshooting
tables in Section 5.

3.2.1

Preliminary Procedures

Perform the following steps prior to

preheating and cooking:

1. Be sure that gas supply is connected
to unit, shut off valve is closed and 120
volt ac (to operate controls) is con­nected.

2. Place the drain plug (Figure 7-6 Index

18) located at front center of cooking
compartment securely in place.

3. Check that pan supports are hung on
pan support studs on cylinder side

walls. The horizontal keyhole on the
support should be at rear of compart-

ment and the vertical keyhole near the

front.

4. Insert drain plug, located inside

compartment into drain opening and

pour approximately six quarts of water

directly into Steam-It compartment.

5. In geographical locations where a
high amount of lime and alkaline (salt

like substances) deposits are present
in the water supply, add two table-

spoons of vinegar directly into six
quarts of water in the Steam-It com-

partment prior to starting the cooking

cycle. If more water is added to main-

tain the required level, an occasional

tablespoon of vinegar may be added
as well, in order to compensate for

new mineral deposits of the fresh

water.

CAUTION
A high degree of mineral salts in the
water can cause pitting of the cooking
compartment unless the above direc­tions are followed, the cooking com­partment thoroughly cleaned and
drained each night, and the door left
open. Do not use distilled water in the
cooking compartment.

3.2.2

Preheating (Figure

Before each initial operation of the
cooker and at any time when the cooking
compartment is cold, a 5- to 8-minute
preheating period is required. To preheat the
cooking compartment, proceed as follows:

1. Insert drain plug (7) into drain opening
and add 6 quarts of water into cooking
compartment.

2. Close cooking compartment door and
lock securely in place by pressing

down on latch handle (5).

3. Place gas supply shutoff valve in the

open position. (Normally left in open
position.)

4. Set 60-minute timer (1) to I minute.

Indicator light (2) will come on.

5. When preheating is ended (5 to 8

minutes) and the buzzer (6) sounds,
turn timer (1) to OFF and allow
pressure to return to zero psi on
pressure gauge (4).

6. Open compartment door slightly by

pulling up on latch handle (5) to allow
remaining vapor to escape before rais­ing door to full open position.

3-1)

3.2.3 Cooking Procedures (Figure 3-1)

After the preheating cycle, the compart­ment may be loaded for cooking. Cooking
procedures are as follows:

1. Carefully slide cooking pans onto pan
supports.

2. Close door and lock in position.

3, Set timer (1) to desired cooking time

(see Test Kitchen Bulletin #21), turning
timer past desired settin-g and then
back. This will insure accuracy of

3-1

setting.

S2127

OPERATION

TABLE 3-1

CONTROLS AND INDICATORS

(See Figure 3-1)

Figure 3-1

1

2'

3

4

5

6

7

Ref.

60-Minute Timer

indicator Light (Red) When lit, it indicates that cooking cycle is

RESET Switch Used to reset electrical circuits during a

Pressure Gauge

Latch Handle Secures cooker door in closed position. Lift

Buzzer
Drain Plug

Description

NOTE

The timer will not start until cooking
compartment is at a minimum of 9 psi

pressure (as observed on pressure

gauge).

4. At end of cooking cycle, steam will
automatically exhaust. When pressure
reaches zero on pressure gauge (4)
door can be released by pulling up on
door latch handle (5). Allow a few
seconds for remaining vapor to leave
cylinder before completely opening
the door. To stop buzzer, turn timer to
"OFF" position.

NOTE

If it is noticed that steam is escaping
around door while pressure is building
up, door seal adjustment must be

made. Refer to subsection 6.3.1 for in-

structions.

5. Remove pans and transfer to serving
area. Perforated pans, if they are to be
transferred to the serving area, should
be underlined with solid pans.

6. Check that water leveL is at six-quart
capacity before starting another cook­ing cycle. If strong flavored foods,
such as onions or seafood have been

Function

Controls cooking duration. Time is manually
set from 0-60 minutes.

in operation.

power loss or shutdown. This switch also
serves as a protective device in the event of
an electrical overload.

Indicates steam pressure (psi&Kg/cm

2

)

inside cooking compartment during cooking
operations.

to open door.
Signals end of cooking cycle (not shown)
Lift to empty water (Inside compartment -

not shown)

cooked, compartment should be drain-

ed, cleaned and flushed and a fresh

supply of water added for the next

cooking operation.

7. Clean unit thoroughly at the end of
each cooking day (Refer to Section

6.2), making sure water is emptied and
compartment is left dry and the door
open.

3.2.4 Low Water Cut-Off Operation
If the Steam-It is operated with no water

or the water has evaporated away, the
temperature of the cooking compartment will
rise and by heat induction effect the Low
Water Cut-Off. Electric current flow will be
broken at the Low Water Cut-Off and the unit
will shut down. With the replacement of
water in the cooking compartment, the unit
will againbe operative.

NOTE

Should a cooking cycle be interrupted
due to safety action of the Low Water
Cut-Off, the food loaded will be under­cooked. Compensation must be made
for the cooking performed and, with

proper amount of water in the cooking
compartment, a new cycle determined
and set to complete the process.

S2127

3·4

3.2.5 shut- Down Procedure
No shut-down procedure is required for

the Stearn-It cooker except that the timer is
in the OFF position, the compartment door is
open, the compartment drained of water, and
the gas supply shutoff valve is closed (only if
required by local code).

3.3 CLEANING

After each period of daily operation (more
frequently as required to maintain
cleanliness), the Steam-It cooker should be
thoroughly cleaned by completing the follow­ing steps:

1. Drain water from compartment by
opening drain plug (Figure 3-2) into
suitable container (to hold at least 6
quarts).

ST·AG STEAM·IT COOKER

Figure 3-3. Pan Support Removal

3. Wash cooking compartment interior
using mild non-abraslve solution.
Rinse and dry thoroughly.

Figure

3-2.

Drain Plug

2.. Remove left and right side pan sup­ports (Figure 3·3) by lifting front
up and forward to disengage from
mounting studs. Wash with detergent,
rinse, and set aside for reassembly.

52127

CAUTION

Failure to wash compartment may
result in pitting of the aluminum
surfaces. Use only mild detergent
suitable for use with aluminum.

4. Replace pan supports in compartment •
and leave door open.

3.3.1 Exhaust Silencer

The exhaust silencer (Figure 7-1, Index 51)
should be removed and cleaned periodically.
As the cooking compartment is exhausted of
steam through the silencer, impurities can
build up from food particles. Cleanings
should be frequent enough to prevent clogg­ing. For this reason, the exhaust silencer is
made easily accessible and simple to
remove. To Clean silencer proceed as
follows:

1. Remove the one-piece exhaust
silencer from the unit by unscrewing it
in a counter-clockwise direction from
exhaust valve elbow.

2. Clean the silencer by sloshing it in hot
soapy water and rinse it in clear water.

If

dirt has clogged the silencer,
presoak it in an alkaline cleaning solu­tion.

3. After cleaning, stand the silencer on
edge to allow it to drain.

4. Screw it back into the elbow of the
exhaust valve (clockwise).

SECTION 4 PRINCIPLES OF OPERATION

4.1 GENERAL
The Stearn-ltcooker consists of a cooking

compartment into which pans of food are
loaded through an inward opening door. The
compartment is filled with water (for steam
generation) which is heated by gas burners
located under the cooking compartment. The

gas burners are ignited by a pilotless, direct
spark (electrode) ignition system which is
electrically controlled by the ignition control

board. Internal compartment pressure is
regulated by the exhaust system which is
mounted at the top rear of the cabinet. The
pressure may be monitored (by the operator)
by viewi ng the pressure gauge which is con­nected in the steam pressure line. Cooking
cycles are controlled by a 60-minute electric
timer which is mounted on the lower front
panel.

4.2 DETAILED OPERATION

With electrical power applied, gas supply

valve open and the timer set to the desired

cooking time, the electrical control circuits
are activated. The exhaust valve closes
automatically and the burner electrodes are

energized. Gas passes through the gas

regulator and valve body to the burners

where the gas is ignited by the direct spark
ignition electrodes. The gas flame on the
main burner heats the water in the cooking
compartment and within a few minutes,
steam pressure begins to build up.

4.3 STEAM CIRCUIT (Figure 4·1)
The steam circuit consists of the steam

pressure gauge, steam trap assembly,
pressure switch, steam exhaust valve
assembly (including an exhaust valve
silencer), a 15 psi pressure relief valve and
associated steam circuit fittings. These are
shown in Figure 4·1.

4.3.1 Steam Trap
As the pressure builds up in the cooking

compartment, cold air is forced out of the
compartment through the thermostatic
steam trap located in the collar at the top
rear of the Steam·lt. The air will continue to
escape as pressure builds up and the steam

trap will close after all the air has been forc­ed out of the cooking compartment

4.3.2 Pressure Switch
When the pressure reaches 9 to 10 psi

(the Steam-It is set to operate at 15 psi) of
pressure the contact on low pressure switch
(Close on Rise) will close, thereby closing the
circuit to the clock motor and starting the ac­tual cooking time period. When the pressure
in the cooking compartment reaches 15 psi,
the contacts on high pressure switch will
open These contacts being wired in series
with the cycling coil of the gas valve (through
the ignition control board), will shut off gas
to the main burner when they are open, caus­ing the pressure to stop rising.

When the cooking compartment cools
and the pressure drops to 13 psi, the con­tacts on the high pressure switch (Open on
Rise) will close, gas will flow to the main
burner and be reignited by the electrodes.
Any number of such "OFF" and "ON" cycles
might occur during the selected cooking
time.

4.3.3 Steam Pressure Gauge and Safety
Relief Valve

Located at the top rear of the Steam-It
and mounted into the forward face of the flue
for visibility, the Steam Gauge registers the
pressu re within the Steam-It cooking

compartment.

The Safety Valve is set to automatically
relieve the cooking compartment of ex·
cessive pressure buildups by opening at a
point between 151/2 psi and 16 psi.

4.3.4 Steam Exhaust Valve and Silencer

The steam exhaust valve is located in the
collar at the top rear of the Steam-lt and it
lets the pressure escape from the cornpart­ment when the timer is shut off. When the
timer is turned on this valve is closed permit­ting the pressure to build up.

To overcome objectionable noises, the
exhaust valve is equipped with an exhaust
silencer which will permit the exhaust valve _
to release steam at the end of the cooking

cv-

cle without any objectionable noises.

4·1

S2127

PRINCIPLES OF OPERATION

4-3

120V.60Hl

INPUT

LOW WATER
CUTOFF SWITCH
NC

TIMER

INDICATOR
LIGHT

EXHAUST
VALVE
NO

r-----,

I I
I

I

I

COIL

L

-----

J

I

IGNITION
ELECTRODE

I

I

I

I

I

I

I

L _

LOW PRESSURE

SWITCH NO

r-------,

I
I
I

I

I I

L

r------------,

I
I
I

I

J

MOTOR

____ ...J

4

I

I

I

I

I
I

I
I

HIGH PRESSURE
SWITCH NC

r------l

I I

I I
I I

I I
I

I I

L_ J

BUZZER

I

~ ~ I

,-----,

I

I

I ~~--~--.

I

COIL I SPARK IGNITION CONTROL

L .J

GAS SOLENOID VALVE NC

NOTE: ALL CONTROLS SHOWN IN THE OPERATING POSITION_

Figure

4-2.

:

I:

I
I L ~

Pictoral Diagram, Electric Circuits,

~~

~I--_

RESETNe

I _

I

120V

52127

44

pressure will continue to rise until the con-

tacts of the high pressure switch (N.C.) are
forced open (at approx 13 psi) by pressure
working on the bellows. When contacts are
opened the gas solenoid valve is closed by
the ignition control board. As the cornpart­ment cools the pressure drops until the con-

tacts return to the closed position, activating
the spark ignition control board in the firing
sequence.

4.4.1.3 60·Minute Timer. The timer contains
a 120 volt ac synchronous motor which drives
a timing dial through a gear reduction and
clutch mechanism. The timer dial is manually
set for any interval of operation from O· to
minutes as read on the calibrated dial face.
The manual rotation of the dial moves the
common element (1) of the timer switch from
the neutral position to contact (3) which con­nects with pressure controls and gas firing
system. The Steam-It is put into an automatic
cycle of cooking with the setting of the Timer

to any of its calibrated periods of cooking. Its
timing cycle, however, is automatically
delayed by the Low Pressure Switch until
free-ventinp has occurred and a cornpart­ment pressure buildup to 10 psi has been
reached. When the timer motor has operated
for the preset duration, the common element
is transferred to contact (4), ending gas firing
cycle, returning exhaust valve to open posi­tion and energizing the buzzer. Contact to the
buzzer circuit remains closed until the dial is
manually turned to the OFF position, return­ing the common element (1) of the timer
switch to the neutral position.

4.4.1.4
which operates by oscillation of a striker
against the core of an electromagnet. When

the timer dial reaches "O-minutes" the buzzer
coil is energized to sound the buzzer. Move-

ment of the timer dial to the OFF position

opens the contact to the buzzer coil to shut it
off.

Buzzer. The buzzer is an alarm device

60·

ST·AG STEAM·IT COOKER

4.4.1.5 Indicator light. The Indicator Light is
located at the lower right front of the front
panel adjacent to the timer knob. It is
to operate only when the timer is set to
cooking cycle. The circuit will be broken
when the timer returns to the "ZERO" post­tion. Thus, when lit, it signifies that the
Steam-It is in the process of cooking.

4.4.1.6 RESET Switch. The RESET switch is
located on the left side of the lower front
panel. The switch is used to reset the
trical circuits of the ignition control board in
the event of an ignition failure

4.4.1.7 Direct Spark Ignition System. The
direct spark ignition system consists of the
electrodes, ignition control board and
associated wiring. On a call for heat, input
power is applied to the control board,
sparking is then initiated and the gas valve
is energized. Sparking continues with the
gas valve powered for a "trial for ignition"
period of 3.3 seconds. If flame has not been
established by the end of the trial
the system will lock out, the gas valve will
close, and the reset function will then trip
out. Reset action is manually accomplish.
by pressing RESET switch. In normal oper ,
tion, as soon as flame is established and
proven by the flame sensing circuitry,
sparking will cease immediately and the
system will remain "on", monitoring the
flame until the end of the duty cycle.
Should flame-out occur during the duty
cle, the system will reactivate the spark to
provide for reignition.

The flame will either be reestablished or
the system will lock out in the normal man­ner. Should lock out occur, the system is
reactivated with the RESET switch for
recycling. Control for operation of the
solenoid gas valve, gas pressure switch and
RESET switch is provided from the circuits
contained on the ignition control board.

wirr

etec-

period,

cv-

S2127

SECTION 5 TROUBLE-SHOOTING

5.1

GENERAL

The information cin this section is in-

tended to assist both the operator and ser­vice personnel in locating the general source
of problems which
Steam-It cooker. Before following any of the
procedures given in this section, the operator
should be thoroughly familiar with the
operating instructions and the function of all
controls which are described in Section 3. If
the problem cannot be readily corrected, the
operator should contact the nearest authoriz­ed Market Forge service agency for
assistance.

may

occur with the

TABLE 5-1

OPERATOR'S TROUBLE-SHOOTING GUIDE

5.2

TROUBLE-SHOOTING GUIDES

An operator's trouble-shooting guide for

use by the Steam-It operator is given in Table
5-1. Table 5-2 gives additional, more exten­sive information for use by service personnel.

5.3

ELECTRICAL FAULT ISOLATION

Correction of an electrical failure first
requires isolation of the fault to a single cir­cuit or component. In most cases the
nature of the failure and its effect upon the
operation of the Steam-It will be sufficient
to isolate it to one or more circuit elements.

Table 5-3 is provided as a guide for

isolating electrical faults.

PROBLEM

Probable

INDICATOR LIGHT FAILS TO LIGHT.

1.

Cause

a. Power to Steam-It off.

b.60-Minute timer not set.
c. RESET switch not pressed.

GAS BURNERS FAIL TO IGNITE

2.

a. External gas supply shutott

-

closed.

STEAM FAILS TO BUILD UP IN COMPARTMENT

3.
a. Compartment does not latch

securely.

b. Low water in compartment.

Remedy

Locate external circuit breaker for
incoming power and place in ON
position.

Set 60-Minute timer.
Due to power interruption. The RESET

switch must be pressed to reset control
functions of control board.

Open gas supply shutoff valve.

Close door and engage handle in latch.
Add water, as required, to bring up to 6

quarts.

5-1

52127

5-2

ST-AG STEAM-IT COOKER

TABLE 5-2

GENERAL TROUBLESHOOTING GUIDE

CONDITION

1) INDICATOR LIGHT FAILS TO LIGHT WITH TIMER SET

a) Power to STAG off

b) Indicator light burned out
c) Faulty wiring

d) Timer contacts faulty Replace Timer
e) Unit will not stay on Reverse Polarity (reverse black

2) GAS BURNERS FAIL TO IGNITE
a) Extemal gas supply

b) Gas solenoid valve fails in closed position Clean or replace valve
c) Faulty ignition control board
d) Electrode unit malfunctioning Clean carbon off electrode or replace
e) Damaged or loose wiring

f) Gas pressure not per specification

(Water Column 3

3) STEAM FAILS TO BUILD UP IN COMPARTMENT
a) Compartment door not latched securely Close door and engage handle in latch. If steam

1/2"

Nat, 10" L.P.)

I

Make sure external circuit breaker for incoming
power is in ON position
Replace light
Inspect condition of wiring and tightness of all
connections

Open gas supply shut-off valve

Replace ignition control board

Trace all wiring from control board to controls.
Check to see that all wiring is secure, and that
high and low voltage leads to electrode are
properly connected

Adjust or replace pressure regulator

fails to build up after door is secured, the problem

may be that the door seal requires adjustment or
replacement

IIUN

&

white wire)

PIN

N/A

10-6683

N/A

10-6291

N/A

N/A

10-7694
10-7696
10-7697

N/A

09-7018 NAT.

09-7019 L.P.

10-2666

b) Steam trap not sealing properly Clean steam trap wI hot soapy water or replace
c) Gas burners not igniting Refer to Problem
d) Safety valve fails to close
e) Safety valve opens intermittently

4) EXCESSIVE STEAM PRESSURE IN COMPARTMENT (ABOVE 15 LBS.)
a) Safety valve fails in closed position

b) Pressure switch setting too high

5) BUZZER FAILS TO SOUND AT END OF COOKING CYCLE
a) Faulty wiring

b) Faulty buzzer Replace buzzer
c) Faulty timer Replace timer

52127

Replace safety valve
Open and close valve to clear blockage

Replace safety valve

Adjust or replace pressure switch

Check wiring from buzzer to terminal block and
timer

#

2 N/A

10-6156

10-7955

10-7955

95-3720

10-6682

10-6291

-

N/A

N/A

TROUBLESHOOTING

-·-----·

Failure

1. Wili not operate when GO-Minute

,

f

urner'Sset

I

i

~

...

2. Intermittent operation

3. Exhaust valve fails to close

.

.

,

--

-

TABLE 5-3

ELECTRICAL FAULT ISOLATION GUIDE

Fault Location

--------_._--

a lncorninq power

Faulty timer

D.
c Wiring

(J.

Ignition system control board

e.

Low

water cutot

3.

Damaged
to paragraph 5.43

-

Exhaust solenoid valve coil

d.

Wiring

b
c. Faulty timer

control

t

system

-··-1

-l

Refer

4. Indicator light off (system operating)

5. Buzzer fails to sound at end of cycle

6. Will not stop operating

7. System fails to operate upon

pressing RESET switch.

5.4 ELECTRICAL TROUBLE-SHOOTING
PROCEDURES

Before performing the trouble-shooting

procedures in this section the serviceman
must be familiar with the function of all
controls as described in Section 3 and with
the Principles of Operation described in
Section 4.

Electrical trouble-shooting procedures

which follow require access to components
and terminals of the operating controls and
ignition control board. Electrical controls
are reached by removing the lower front
panel as described in paragraph 6.3.2. Wir­ing and terminal locations are shown in
Figure 5-1. Figure 5-2 shows the circuit
schematically.

a. Indicator light

Wiring

b.

a. GO-Minute timer contacts
b. Buzzer
c. Wiring

a. 60-Minute timer motor

a. RESET switch

Wiring

b.
c. Ignition control board

5.4_1

Incoming Power

Before trouble-shooting any of the elec­trical parts or assemblies, verify that power
is being supplied to the Steam-It input
power terminals. Incoming power is con­nected at the terminal block (Figure 7-1,
items 15, 16). With power connected to the

Steam-It, an ac volt-meter is used to

measure 120 volts across terminals to lines
coded L1 (hot lead to wire number 5) and L2
(neutral lead to wire number 4). If power is
not present, the connection to the Steam-It
is faulty. If 120 volts is present, and the
cooker will not operate, the fault lies within
the electrical circuits of the Steam-It.

S2127

5·4

HOT LEG IL 1) OF
LINE SIDE MUST BE
CONNECTED TO LE
NO 5

AD

IMPORTANT
CHASSIS MUST
BE GROUNDED

TERM

BOX

GRD

L2

r--

'--

1

,II

LlIHOT)
LINE

~

~

~

'--

'--- GAS VALVE

4
5

SPARK IGNITION
CONTROL BOARD

12

6

7

10-

SOLENOID

NC

1

B El

A
V2

•

L2

'--

RESET
SWITCH

ST-AG STEAM-IT COOKER

HV

r-

(

LV!

ELECTRODE

•......

",C

1-1

I--

t--

t>--

t--

22

2d

x

20
191

}SEE NOTE 2

I EXHAUST

VALVE NO

ILOWWATER

CUT·OF F

E2

(,:f[yj

PRESSURE
SWITCHES

c!:!J

BUZZER

NOTES:

1. ALL WIRING NO. 16 AWG. 26 STRAND GE CLR 125X·
LINK. 600V (WHITE) EXCEPT AS NOTED. UL AND

CSA APPROVED

2. SRG·5600 NO. 167/0.0192. 600V·200 C IRED)
(CONTINENTAL). UL AND CSA APPROVED

FigureS-1. Wiring Diagram, Steam-It, 120V,60Hz

r--:

'"

-~

N
N

'"

0

N

;:;,

INDICATOR
LIGHT

~

)24

TERM
BLOCK

5

16
2

11
4

1"

17

16

1

14 •••

~4 3.

11

c::

TIMER

~ 13

3

-

M

~

S2127

TROUBLE-SHOOTING

5-5

Ll

TIMER
SWI TCH

...--

"'-4~-..J"'-""''''-- I (OFF) POSITION ON DIAL

LOW WATER I 31TIMER SET

CUTOFF

r-

o

I

RESET
(CIRCUIT ~

BREAKER) ~

L__J

r-------------..a

-,

4 : (0) POSITION ON DIAL

PRESSURE
SWITCH NC

SPARK IGNITION

PR ESSU RECONTROL BOAR D

SWITCH NC ,-- ---,

4~ ...•

~_~1

.A

I:

I -

INDICATOR
LIGHT

EXHAUST

VALVE

III

L- ~~

TIMER
MOTOR

L2.~I~--------~

B•••

I

T

-----.

L2

--.J

<t:

a:

r-

z

r---L V__ ~ J-Efl _ V2

ELECTRODE : HV _

'-------- L

Figure 5-2 SchemaUc Diagram Steamtt. 120V

5.4.2 Electrical Inspection
The first step in any electrical trouble-

shooting procedure is a thorough physical
inspection of all wiring connections. To ac­cess electrical components remove the
lower front panel (Figure 7-1, 11), -and the
chassis assembly (Figure 7-3) as explained
in paragraph 6.3.4.

WARNING

Before removing panels or checking
connections and wiring be sure that
the main circuit breaker for incoming
power to the
power is supplied all exposed ter­minals of the control panel
volts.

Stearn-lt

is OFF. When

carrv

tzn

..J

SOLENOID

GAS VALVE

Check all wiring connections by hand to

assure that both ends of all connection

points are tightly secured. Use a screwdriver
to tighten connection points if necessary.
Visually inspect all quick-disconnect ter-

minals for evidence of corrosion. Terminals

in this condition should be separated, clean­ed with sandpaper until shiny and tightly

reconnected. If excessive corrosion is
ed, the terminals must be replaced. Check all
wiring for signs of cracked insulation.

Replace any damaged wiring.

5.4.3 Direct Spark Ignition Control System
The ignition control board and associated

components are the main electrical control
for operation of the Steam-It cooker. If it is
determined that the electrical controls

torrn-

52127

5-6

(solenoid valve, RESET switch, electrode,
etc.) are not damaged and the interconnec­ting wiring is complete and not damaged, the
trouble is due to a malfunction of the corn­ponents on the ignition control board. Corn­ponents on the control board are not
replaceable and a damaged control board

must be replaced with a functional unit. The
following paragraphs outline possible pro­blems and symptoms that may be en­countered during the normal use of the
Stearn-lt.

CAUTION

If a control board is replaced, be sure

that the high voltage lead of the

etec­trode is connected to terminal E1 and
the low voltage lead is connected to
terminal E2 of the control board.

5.4.3.1

Improper Polarity. If a spark is present
and the gas valve opens, but the system
shuts down after the trial period, check the
120 volt ac input voltage at terminals A (L1),
and L2 of the control board, for proper polari­ty. Terminal A should be the hot side of the
line and L2 neutral.

5.4.3.2

Damaged Grounding. If a spark is pre­sent and gas valve opens, but the system
shuts down after the trial period, check to
make sure the system is properly grounded
to the burner and that the burner is properly

grounded. Proper grounding is essential for
the proof of flame safety device. If the
system is not grounded to the burner, it can·
not determine the presence of flame and will
lock out. A restart will initiate the trial for ig·
nition period, but the system will continue to

go into "lock out" if it is not properly ground·
ed, and the thermal reset timer will trip. Wait
one minute before pushing the RESET button
in. Check all power and ground terminals to
make sure good contact is made. Clean any
corrosion that might interfere with good elec·
trical contact.

5.4.3.3

Malfunction Due to High Voltage.

During the trial for ignition, if the spark is in­termittent and the valve may (or may not)
open, check the spark gap on the electrodes
and system wiring as follows:

1. Remove the electrode from burner and
check to see that the gap is 1/8 inch

±

1/32 inch. If it is not, replace elec·

trode.

2. Visually check the ceramic housing
and lead wires for cracks or breaks.

52127

ST·AG STEAM·IT COOKER

3. Check terminals E1 and E2 for
inadvertent grounding. They should be
no closer than

1/2

inch from metal ob­jects, which can cause arcing to
ground.

If

the electrode or electrode

lead wires are faulty, replace with new

electrode and wiring.

5.4.3.4

Malfunction of Gas Valve. If the board

is receiving proper power and there is a spark
during the trial for ignition period, but the
valve will not open, check the valve for an
open coil or other malfunction. Be sure
voltage rating of the valve is 120 volts ac. Use
a voltage tester or volt-meter at terminals B
and V2 of the ignition control board. The
voltage shou Id be the same as the valve.

5.4.3.5

Erratic Operation. If the system
operates properly for a while but randomly
shuts down during the duty cycle, or won't

operate during "cold" starts, check the flame
proving circuit with a dc microamp meter.
Refer to Figure 5-3 and proceed as follows:

1. Locate ignition control board, Figure
7·3, Item 5.

2. Remove low voltage wire from
terminal E2 and connect one lead of
microamp meter to push-on connector
attached to lead wire.

3. Connect second lead of meter to
terminal E2 on ignition control board.

4. Energize control board and read

current on microamp meter. Typical
flame current is 2 to 20 microamperes.

=

o

TO

SO

MICROAMP

METER'

51

ELECT RODE

Figure

5-3.

Placement of Flame Current Meter

TROUBLE·SHOOTING

If you have low or marginal flame current,
it is tripping the thermal reset switch. If this
is the case, you should relocate the elec­trodes or flame sensor into the flame to in­crease the flame current. If the ignitor is swit­ched off and on several times in succession,
the thermal reset switch will trip, and it will
have to be reset. If ignition is not achieved
after the first two or three attempts, check to
insure that the other components in the

system are functioning correctly.

5.4.4 GO·Minute Timer

5.4.4.1 Timer Contacts. Defective timer con­tacts will result in failure of the Steam-It to
operate properly. If the cooker fails to
operate when timer is set to desired time the
fau It is with the 60·m inu te ti mer contacts or
its wiring. When this occurs, remove the con­trol panel (paragraph 6.3.2), and proceed as
follows:

1. Turn off power to the Stearn-lt at
external (main) circuit breaker.

2. Disconnect all wires (13,14 and 16)
from timer terminals. (See Figure 5·1.)

3. Connect an ohmmeter between
terminal 1 and terminal 3 of timer.

4. Rotate timer dial beyond the
O·MINUTE point (any setting) to obtain
a reading of zero ohms on the ohm­meter. If zero reading cannot be ob­tained, timer contacts are defective
and the timer must be replaced.

5. Move ohmmeter leads to terminals 1
and 4.

6. Rotate timer dial to a-MINUTE
position. (An audible click indicates
correct position.) If zero ohm reading
cannot be obtained, the timer is defec­tive and must be replaced.

7. Remove ohmmeter and replace all
leads on timer terminals as shown in

Figure 5-1.

5.4.4.2 Timer Motor. A defective timer motor
will cause continuous operation with the
timer dial failing to return to the a-MINUTE

position. If the timer motor fails to turn pro-

ceed as follows:

1. Turn off power and carefully check
motor wire leads and tighten connec­tions if found loose.

5·7

WARNING

Use care while working with control
wiring. Terminals carry 120 volts.

2. Turn on power to the Steam-It.

3. Set 60-minute timer dial (any setting
beyond "a-minute"). If operation is
correct the motor will turn the dial dart
through an arc toward "a-minute". If
the motor fails to operate, it is defec­tive and the entire timer must be
replaced.

4. Shut off power to the Steam-It.

5.4.5 Solenoid Gas Valve
When the solenoid gas valve fails to

operate, the fault may be a defective valve or
control board. An ac volt-meter is used to
check the voltage at the coil wire terminals
with the Steam-It operating. If voltage of 120
volts IS present the valve is defective and

must be replaced as a unit. If 120 volts is not

pres~nt ~nd all wiring connections are tight,
the Ignition control board is defective and
must be replaced.

5.4.6 Buzzer

If the buzzer does not sound at the ter-

mination of cooking time (timer dial returned
to "a-minute" position), the fault may be a
defective buzzer. Buzzer operation is verified

using an ac volt-meter at buzzer coil connec-

tions (permanently SOldered), with input

power on, and the 60-minute timer dial at the

"O-minute" position. If voltage is 120 volts,

the fault is in the buzzer which must be

replaced. If 120 volts is not present, the fault

is in the wiring.

5.4.7 Indicator Light
If the Steam-It functions correctly with

the single exception that the indicator light
falls to light during operation, the fault is a
defective indicator light or wiring. A "burned-

out" or defective light is verified by using an

ac volt-meter at the leads on terminal block
with input power on, and the 60·minute timer
dial set (any setting beyond "a-minute"). If

120 volts is present the fault is in the in-

dicator light and requires replacement. If 120

volts is not present the fault is in the wiring.

52127

5-8

5.4.8

Wiring

All of the electrical components of the
Steam-It (60-minute timer, pressure switches,
gas solenoid valve, RESET switch, exhaust
valve, low water cutoff switch and ignition
control board, buzzer and indicator light) are
connected to each other by wiring shown in
Figure 5-1. If all of the electrical components

are operating correctly (and the incoming
power has been checked), but the cooker
fails to operate the fault lies in the wiring.

Figure 5-1 is a wiring diagram which
shows all terminals and interconnections
within the electrical circuits. All numbered
terminals are identified and all leads number

TROUBLE-SHOOTING

coded as shown. Connections can be easily
removed. Figure 5-2 shows the same informa­tion schematically and is an aid in isolating

circuits for testing.

Using an ohmmeter, wiring continuity
between the connections shown on the wir­ing diagram (Figure 5-1) are readily verified.

This is best done in stages, removing only
those wires required for each continuity
check. As each lead is replaced it should be
checked for evidence of corrosion and clean­ed if necessary. All leads must be tightly at­tached so as to provide a good electrical con­nection.

52127

SECTION 6 MAINTENANCE

6.1

GENERAL

This section contains both preventive and
corrective maintenance information. Preven­tive maintenance may be performed by
maintenance personnel at the establishment
in which the cooker is installed. It is recom­mended that user personnel never attempt to
make repairs or replacements to the equip­ment without the assistance of authorized
service. Assistance in service methods or a
current Director of Authorized Service Agen·
cies may be obtained from Market Forge.
(See paragraph

6.2

PREVENTIVE MAINTENANCE

A good preventive maintenance program

begins with the daily cleaning procedure

described in paragraph 3.3 in Section 3. Addi­tional preventive maintenance operations are

presented in this section. In establishments

which employ full-time maintenance person-

nel, the tasks described can be assigned to

them. For other installations, tasks requiring

mechanical or electrical experience should
be performed by an authorized service

agency.

The following paragraphs set forth

minimum preventive maintenance pro-

cedures which must be completed

periodically to assure continued trouble-tree

operation of the Steam-It cooker.

1.3

in Section 1).

1. With cooking compartment door open,
lift pan supports up and forward to

disengage from mounting studs.
Remove from compartment as shown
in Figure 3-3.

2. Disengage left and right ends of door
seal spring by counter-acting the force
of the door lift spring with one hand
while disengaging studs with the
other hand (Figure 6·1).

DOOR SEAL
SPRING

PAN SUPPORT

CAUTION

Under no circumstances shall hard­ware (or parts) be replaced with a dif­ferent length, size or type other than
specified in the parts list. The hard­ware used in THE STEAM-IT COOKER
has been selected or designed
specifically for their applications and
the use of hardware other than those
specified may damage the equipment
and will void any warranty.

6.2.1 Disassembly and Cleaning

The door assembly must be removed from

the cooker compartment for weekly cleaning.

Though no tools are needed, care in follow-

ing procedure is necessary to insure that the
door will pass through the compartment
opening.

Figure 6-1 Door Spring Disengagement

3. Push door lift springs to the rear and
off studs.

4. Rotate the door assembly out through
the door opening, door handle first, as
shown in Figure 6-2.

5. Inspect door gasket for cleanliness

and wear. If food soil has become

lodged behind the gasket or the

gasket is torn, push it off perimeter of
door and clean with mild detergent­water solution, or replace as needed
(Figure 6-3). A gasket which is stuck to
the door is easily removed by first

soaking the entire door in hot soapy

water.

6·1

52127

6·2

ST-AG STEAM-IT COOKER

Figure 6-2. Door Removal

NOTE

To assure a pressure seal, the gasket

must be cleaned of soil and scale, and
be free of breaks.

6. Replace gasket on door and

reassemble door assembly in com­partment. Open and close door
several times to check for correct
operation and tight seal of door in
closed position. See paragraph 6.3.1.2
to adjust door seal tension.

6.2.2 Safety Valve Check
The safety valve is a protective device

which automatically relieves excessive

pressure between
unlikely event of equipment malfunction. If
the safety valve should leak continually with
a pressure build-up, or should it cause an in­terruption of the cooking cycle prematurely
(less than

15-1/2

must be assumed that the safety valve is
defective and be replaced. However, the
steam gauge should first be checked for ac­curacy before making this determination.
The steam gauge should register zero with no

pressure in the cooking compartment. If the

normal zero setting has advanced somewhat
through usage (a characteristic of steam

gauges), the steam gauge should be replac-

ed.

6.2.3 Door Fulcrum and Drain Cleaning and

Lubrication

The door fulcrum and drain assemblies,
located under the door opening, include the
door latch anchor, drain components and the

15-1/2

and 16 psi, in the

psi on the steam gauge), it

Figure

6-3.

Gasket Removal

fulcrum adjustment screw. These parts are
shown in Figure 7-6.

Periodic unscheduled cleaning of the
drain and plug assembly with detergent­water solution will ensure trouble-free opera-

tion. The drain plug handle and drain hole
must be free of food particles, with motion

easy and unrestricted.

The anchor is equipped with a bronze
roller bearing (11) which engages the hooked
door latch. The entire roller assembly is
shown as item (13) in Figure 7-6. The roller

must be cleaned periodically to insure free-

moving operation. Should accumulated dirt
or food interrupt normal rolling, detergent­water solution should be used to free it.
Cleaning should be followed by lubrication

using graphite or other dry lubricant.

6.2.4 Cooking Compartment

A

daily cleaning of the cooking compart­ment is required. Remove pan supports and
thoroughly wash and rinse cooker compart­ment interior with mild soap or aluminum
cleaner. Leave door open when cooker is not
in use. See paragraph 3.3 in Section 3.

CAUTION

Do not use strong detergent or
abrasive cleaners. Pitting of aluminum

interior will result.

6_2.5 General Inspection

Prior to daily use the operator should
visually inspect the unit to see that there is
no missing or detective hardware, cracked
glass on pressure gauge, cracked timer knob,
and that pan supports are properly installed.

52127

MAINTENANCE

During operation the operator should
observe that the timer is indicating proper
cooking time, pressure gauge is reading cor­rectly and steam trap and exhaust valve are
operating properly The first indication of
defective steam trap operation will usually be

evidenced by uneven cooking. If working pro-

perly, the steam temperature will be even and

cooking will be uniform through the cooking
compartment. Trouble may occur either
through premature closing of the steam trap
before all the cold air has been exhausted or
by its failure to close sufficiently to enable a
proper steam pressure build-up. Either case
warrar.ts the replacement of the steam trap.

6.3 REPAIR AND REPLACEMENT

NOTE

The critical function of the door seal
makes it imperative that the gasket be
in good condition. For this reason it is
recommended that at least one spare
gasket be kept at all times.

6.3.1.2 Door Seal Tension Adju~tment. An
adjustment screw is built into the door an­chor and fulcrum assembly to allow compen­sation for normal variation in gasket
thickness caused by wear. The adjustment

screw is shown in Figure

6-4.

If steam
escapes from around the door, sealing ten­sion against the door opening can be in­creased by loosening the

1/4-20

jam nut and

6·3

WARNING

Be sure to disconnect

120

volt input
power and shut off gas supply before
disassembling components and mak­ing repairs and replacements.

Section 7 of this manual contains a listing

of all replaceable parts and associated ex-

ploded views of the Steam-It. In most cases
disassembly procedures will be obvious from
the exploded views. Illustrated disassembly
and assembly instructions follow for pro­cedures which are not readily apparent.

NOTE

Complete disassembly of cabinet and

panels are not required. Remove only

the panels or components required to

make repairs and replacements.

6.3.1 Door Assembly

The door assembly consists of the door

latch and the latch fulcrum assembly. All
parts are replaceable as shown in Figure 7-4,
Door Assembly; Figure 7-5, Door Latch; and

Figure 7-6, Door Fulcrum and Drain.

6.3.1.1 Gasket Replacement. The door
gasket (Figure 7-4 index 6) is readily replaced
by first removing the door assembly from the
cooking compartment as explained in

paragraph

6.2.1.

The worn gasket is removed
in the same manner as described for clean­ing and a replacement substituted. A new

gasket which is difficult to stretch onto the
door can be made pliable by first soaking it in

hot soapy water. Remounting the door in the

compartment completes the replacement.

Adjustment

Jam

Nil!

" /screw

! ) .'

~~:I- . ....

.)'

~

,

_"" ;.1 /

~

To Trqhten
Door Se~J

To Loosen /

Door S"al

Figure

6-4.

Door Seal Tension Admustment

turning the socket head adjustment screw
counterclockwise with an allen wrench. In­stallation of a replacement door gasket may
result in excessive door latching tension and
require clockwise adjustment of the screw.

Trial and error will achieve the screw adjust-

ment which both seals the door against the

compartment opening yet allows door lat-

ching with only moderate force applied to the
handle. The final position is set by holding

the cap screw with an allen wrench while

tightening the

1/4-20

6.3.1.3 Door Lift Spring Replacement.
Should either spring become damaged, it is

necessary to replace both left and right
springs as a set (Figure 7-4). The door
assembly is removed from the cooking com-

.

/

jam nut.

/

./

/

52127

6·4

partment as explained in paragraph 6.2.1.
Springs are installed by removing spring
bearings (2), screws (1), and worn springs (3
and 4) and mounting replacements. Springs
are marked with tabs indicating the left and
right side replacement springs for installa­tion on the appropriate side as viewed from

the front of the compartment.

6.3.2

Exterior Panel Removal

Access to all internal pJumbing
assemblies is from the top and front of the
Steam-It cabinet. Whenevec internal repairs
or replacements are required, the applicable
panels must first be removed. These parts
are shown in Figure 7-1. The following pro­cedure is required for removal of exterior
panels.

1. Raise the cooking compartment door.

2. Remove screws (7) in lower front panel
(11) and timer knob (Figure 7-3,23).

3. Slide lower front panel (11) down from
cylinder and lift off.

4. To gain access to terminal block (for
primary power), remove screws (1)
securing terminal box cover (13) to
side panel.

5.

To gain access to the gas pressure
regulator, remove screws (28) securing
access cover (29) to side panel.

6.3.3

Steam Exhaust Valve and Trap Replace·

ment

The components of the steam exhaust
valve assembly, trap, safety valve, silencer,
pressure guage and associated plumbing
and hardware are replaced by first removing
flue assembly (Figure 7-1, index 32) and
pressure gauge (33). To remove flue
assembly proceed as follows:

1. Unscrew and remove exhaust silencer
(Figure 7-1 index 51).

2. Detach the

3/16"

copper tube

connector from the pressure gauge at
the ferrule nearest the pressure
gauge. Then, remove the copper tube
entirely by freeing it at the other fer­rule.

3. Apply inward pressure at either side of
the flue with a screwdriver. This will

collapse the side walls slightly to

allow the small fluted sections of
sheet metal to clear the edges of the

ST-AG STEAM·IT COOKER

flue opening provided in the outer
shell of the Steam-It. With the restric­tions of the flutes removed, the flue

may then be lifted up over the com­ponents.

4. Replacement of safety valve, trap
plumbing and exhaust valve assembly
(as required) may now be made. The

. components of the steam exhaust

valve assembly are shown in Figure
7-2.

6.3.4

Direct Spark Ignition System

The ignition system components may be
replaced by removing the burner chassis
assembly (Figure 7-3). To remove complete
burner chassis assembly proceed as follows:

WARNING

Be sure that electrical power and gas

supply are shut off before removing

burner chassis.

1. Complete exterior panel removal. (See
paragraph 6.3.2)

2. Disconnect the lead wires NO.4 and 5
in the terminal box on left side of the

Steam-It. (See Figure 5-1) These wires
must follow the chassis as it is pulled
forward.

3. Disconnect the gas connection at the

right side (or bottom). The piping must
be unscrewed from the gas elbow in­side.

4. Disconnect the steam pressure line
from pressure switch assembly
(Figure 7-3, index 17).

5. Disconnect red low-water cut-off wires

19 and 20 and exhaust valve wires 21

and 22 from the terminal block.

6. Remove centering screw, nut and

washer from front center bottom of
chassis. The chassis assembly may

now be pulled forward and completely
removed from the Steam-It.

6.3.4.1

Gas Burners. The gas burners may be
removed by first disconnecting wires to elec­trode (Figure 7-3, index 30). Remove stud,
receiver (55) and carefully lift the back end of
burners (32) until clear of holding pins in bracket
then pull backwards. To replace burners, slide
the front end over orifice holder then drop the
back end into position and replace receiver (55).
Reconnect wires to the electrode (See Fig.5-1 ).

S2127

MAINTENANCE

6.3.4.2 Ignition Control Board. (See Figure
7·3.) To remove ignition control board (5),
first disconnect wires at electrode (30), reset
switch (20), gas valve (42), pressure switch
assembly (17)and terminal strip (27). Remove
screws (1) nuts (2) lockwashers (3) and
spacers

(4)

and remove control board

(5).

NOTE

Ignition control board components are
not replaceable. A damaged board
must be replaced with a new
assembly.

In addition, regulator (39) must be set to pro­per setting of4,0" W.C. for natural and
manufactured gas and 10"

w.e.

for propane
and butane gases. (Regulator is set at 4"
W.C. pressure at the factory and must be
changed to 10" W.C. pressure as required.)
Regulator is adjusted by removing slotted
cap and positioning marked spring guide as
shown in Figure

~.-.S(Alll\f>

6-6.

0---

lOP

v"w--@

6-5

6.4 ADJUSTMENTS AND OPERATIONAL
CHECKS

During normal use or when parts are

replaced certain adjustments must be made.
Components requiring adjustments or opera­tional checks are outlined in the following
paragraphs.

6.4.1 Gas Burners and Pressure Regulator

The burners and fixed orifices are sized
at the factory for natural gas operation. The
burner air shutters should be adjusted at the
proper opening to produce a blue flame
without yellow tipping. To adjust air shutters
see Figure 6-5. Special size orifices are re­quired for the gas burners. Refer to Figure 7-3
indexes 43, 44 and 45 for correct orifices to
be used with certain gases.

~---GAS BURNERS

~SHUTTERS

BURNER
CHASSI~

TYPE OF GAS DIM A

NATURAL&MANF'D. 5.132"

PROPANE & BUTANE

Figure

6-5.

Air Shutter Adjustment

7/32"

=tl=~

NAIUqAl GAS,

POSITION

Figure

6-6.

Gas Regulator Adjustment

6.4.2 Electrode Assembly
Electrode assemblies (Figure 7-3 index

30) are preset to a gap spacing of 0,125 inch

±

0.032 inch and should be checked
periodically. If spacing is not correct adjust­ment is not to be made, The complete
assembly must be replaced with a new unit.
Electrodes are not field adjustable.

6.4.3 Solenoid Gas Valve

The solenoid gas valve (Figure 7-3 index

42) is used to control the flow of gas to the
main burner which is under control of the
pressure switch. To check valve operation
proceed as follows:

1. Make certain the power disconnect for
the unit is on,

2. Turn on gas supply and turn timer
knob to 15 minutes. Electrodes will be
energized.

3. Turn timer to zero. Listen carefully for
the slight sound indicating the valve

has closed.

4. If burner flame has not gone out, cycle
the valve several times. The cycling
should jar loose any dirt or impurities
that may settle on the valve seat.

5. After check ..is made return timer to
OFF and shut off gas supply.

6.4.4 Timer and Gas Control Switches
The timer control switch automatically

delays the timer count-down at the beginning
of the cooking cycle until the
fully vented out all cold air from inside the
cooking compartment and pressure has

ll' GAS POSITrON

Steam-It

has

52127

6-6

reached 10 psi. The gas control switch
governs the flow of heat to the cooking com­partment to maintain compartment pressure
at a near constant 14 psi. To adjust each

ST-AG STEAM-IT COOKER

switch for proper activation, turn adjustment
nut (as applicable) clockwise to raise and

cou nterclockwise to lower actuation

pressure point.

52127

SECTION 7 ILLUSTRATED PARTS LIST

7.1 GENERAL

This section contains a complete listing
of all replaceable parts of the Model ST-AG,
Steam-It Style F, Gas Operated cooker. For
the purpose of parts identification, the unit is
broken down into functional assemblies, and
each assembly is shown in an exploded view

which is keyed to the accompanying parts
list. Each parts list contains the figure index
number, the Market Forge part number and
an abbreviated description.

7.2 ORDERING INFORMATION

Orders for repair parts should be directed

to the nearest authorized parts distributor.

For a current Market Forge Authorized Parts
Distributor List contact:

Product Service Department

Market Forge
35 Garvey Street
Everett, Massachusetts 02149

Telephone: [phone]

Product Service Department
Market Forge Canada, Ltd.
1375Aimco Blvd., Unit 5
Mississauga, Ontario, Canada

Telephone: [phone]

All orders should contain the Market Forge
part number(s), the part description(s), and
the model and serial numbers of the cooker
for which the part(s) is ordered.

7.3INDEX OF ILLUSTRATED PARTS LIST
Figure Page

7-1 Cabinet&Frame Assembly 7-2
7-2 Steam Exhaust Valve Assembly 7-5
7-3 Burner Chassis Subassembly 7-6
7-4 Door Assembly 7-8
7-5 Door Latch Assembly 7-9
7-6 Fulcrum and Drain Assembly 7-10

L4W 185

7·1

52127

ST -AG STEAM-IT

coo

KER

S2127

ILLUSTRATED PARTS LIST

FIG. 7·1

INDEX NO.

PART NUMBER

DESCRIPTION

1

2
3
4
5

6

7
8
9

10
11

12 10-6847
13 95-0689
14 10-1717*
15 10-5069
16
17 95-3528
18 10-5243

19 10-1759"
20
21 10-2340"

22
23
24 95-3190
25 95-0115
26
27 95-0918
28
29
30
31
32
33

34
35
36 10-2105
37
38
39
40

41 10-0226
42
43
44
45
46
47
48

10-1956'
95·3131
95-3757 Outer Case, left side
95-3768

,

95-3126 Outer Case, back
95-3754 Inner Case Subassembly

10-1776"

10-2636'

10-7568 Plate, reset button

10-7569 Panel, nameplate
95-3756 Panel, lower front

10-5070

10-2505 "

10-6969
10-3360

10-1945"

10·1863 •
95-3766
10-4667
10-6924
95-3135
10-0883

95-3133
95-0714

10-2405
10-2511
10-2307
10-177 4

-

-

10-1937
95-0096
95-0097

10-1842

10-6976

-

Screw, phil. tr. hd., type A, stl, nickel pI. #8 x
Outer Case, top and front

Outer Case, right side

Screw, mach., binding hd., st. stl., ##10-32x
Rivet, tubular,

Tape, insulator 3/4" wide x 6" Ig. (Use with panel index 11)

Cover, terminal box

Screw, mach., rnd. hd., stl., cadmium pl., 8-32 x 3/8"
Terminal Strip, contact section
Terminal Strip, end section

Insulator, terminal strip
Conduit Nipple and locknut, malleable iron, cadmium pl.,

1/2

oval hd., alum., 0.059 dia. x

3/8"

1/2"

1/8"

1/2"

Screw, mach., rnd. hd.,

Lockwasher, stl., cadmium pl., #10
Nut, hex, stl. cadmium pI. #10-32
Lug, ground
Elbow, 90°, brass, 1/81PS x 3/160.0.
Body Assy
Fulcrum and Drain Assembly (see Figure 7-6)
Screw, mach., rnd. hd., stl., cadmium pI.
Inner Case Adapter, left side
Screw, mach., phil. tr. hd., st. stl.,
Access Cover, pressure regulator

Button, plug, 1 1/4" dia.

Plate, serial
Flue Assy
Gauge, pressure, 0 to 30 lbs,
and bracket supplied with gauge)
Inner Case Adapter, right side
Inner Collar Assy
Bolt, square hd.,

Wa~her, plain, stl., cadmium pl.,

Lockwasher, stl., cadmium pl.,
Nut, hex., stl., cadmium pl., 5/16·18
Screw, binding hd., type Z, st. stl., #8-32 x 3/8"
Bumper, handle
Door Assy. (See Figure 7-4)
Door Latch Assy. (See Figure 7-5)
Stud, support, pan and door pivot
Pan Rack Assy., right
Pan Rack Assy., left
Screw, mach, rnd. hd., stl., cadmium pl., #8-32 x
Low Water Cut-Off

"NOTE: Available at local hardware store.

stt.,

stt.,

cadmium

1/8"

cadmium pI. 5/16-18 x 1.00"

pt.,

##10-32x

1/4-20x5/8"

#6-32-1/4"

IPS (mounting hardware

5/16"

5/16"

3/8"

3/8"

7...•

ST -AG STEAIIUT COOKER

FIG. 7-1

INDEX NO.

PART NUMBER

49
50
51
52
53
54 95-3834
55
56
57

58
59
60
61
62
63
64
64A
65
66

67

DESCRIPTION

10-1939 Stud, Support, Door Spring

95-3792

10-4963
10-3851
10-3852

Pressure Line, Steam
Silencer, Exhaust
Elbow, 90 , Brass,
Nipple, Brass,

3/8

3/8"

IPS x 1

112"

Elbow, Adapter Bushing and Nipple Kit
10-7955' Valve, Safety, 15 PSI
10-6833
10-6158
10-6156

10-2904

10-3361
95-3270
10-3420

10-3432 Tee, Reducing, Brass,
95-0771
09-6544

Plate, Rating
Adapter, Steam Trap
Trap, Steam
Connector, Male, Brass,
Connector, Female, Brass

1/4"

1/8"

IPS x

IPS x

1/4"

3/16

00

00

Tubing, Pressure Gauge
Nipple, Chrome Plated brass,

IPS x 1

112

1/4

1/4"x1/8" x1/4"

Exhaust Valve Sub-Assy. 120V 60Hz (see Figure 7-2)
Exhaust Valve, 120V, 60 Hz, New Style ( see pg. 7-11)

10-1956 Screw, phil. tr. hd., type A, steel, nickel pI. #8 x
95-3189 Deflector Plate, Exhaust Valve
95-6017

Kit, Corrosion Rod (Not Shown)

3/8"

FIG. 7-2

INDEX NO.

1
2
3
4
5
6
7
8

9

10
11
12
13
14
15
16

* NOTE: Available at local hardware stores

PART NUMBER DESCRIPTION

10-1663*

10-2425*

10-4675

Pin, Cotter,

1/16 x1/2",

Washer, # 10 Flat,
Spring, Compression

st. stl.

3/16"10x

1/2"

00

95-2077 Body Assy., Diaphragm
95-0372

95-0756
10-1678*
10-1759*
10-2505*

95-0755
10-1701*
10-2500*

95-0760

10-6292

95-0431

10-6658

Ball and Pin Assy.

Tee Assy.

1/8"

Pin, Roll,
Screw, rd. hd. #10-38 x

x 1-118",cad. pI.

3/8",

cad pI.

Lockwasher,#10, cad. pI.

Channel

Screw, rd.hd.,
Lockwasher,

1/4-20x3/8",

1/4,

cad. pI.

cad. pI.

Pin, Solenoid
Solenoid, 120V, 60 Hz, complete
Bracket Assy., Solenoid
Coil, 120V, 60 Hz

x .086 thick cad. pI.

-

82127

* NOTE: Available at local hardware stores

ILLUSTRATE _

o PARTS LIST

2

7,5

16

o

0----

-

---- h

Figure 7-2.

Steam

Ex

ust

Va v

a ,

IeAssembly

52127

7-6

ST·AGSTEA M-ITCOOKER

S2127

ILLUSTRATED PARTS UST

7·7

IFIG. 7-3 INDEX
. NO.

1
2
3
4
5

6 95-3734

7

8

9

10
11
12
13
14

,

15
16
17
18

19
20
21
22
23
24
25 95-3393
26 10-1747

27

28
29

30 10-7697

30A
30B 10-7698
30C 10-7699

31 95-3791

32 10-8341

33 10-1804

34

35 10-2500

36

37 10-3395

38

39

40 10-3362

41 10-3389

42

,

43

44 10-2921

PART NUMBER

10-1842
10-2332
10-2421 Lockwasher, Stl. Nickle PI.#8

95-3750

10-7696

10-1717

95-3733

10-2425

95-3144
95-3729
95-3732
10-0265

10-1720

10-2428
10-2515 Lockwasher, Stl., Cadmium PI.,
95-3720

10-2331

95-3719
09-8015
10~683
95-3705 Bracket, Pilot Light
10~307 Knob, Timer
95-0462

10~166 Terminal Strip
10~682 Buzzer, 120V
10-1722

95-3769

10-2400

10-2308

95-3744

10-7695 Pressure Regulator, 3/8"

10-7694 Gas Valve, 120V, 60 Hz, 1/2"

10-0957 Burner Orifice,

-

Screw, Mach, Rnd Hd. Cadmium PI.#8 - 32 x 7/8
Nut, Stl, Cadmium PI. ,#8 - 32

Spacer, Control Board Shield
Ignition Control Board

Shield, Ignition Control Board
Screw, Mach., Rnd. Hd., St. StI.,
Deflector, Right Side
Washer, Plain, Stl., Cadmium PI.
Spacer, Deflector
Shield, Left Side
Deflector, Left Side
Bushing, 9/16" ID
Screw, Mach., Rnd Hd., St Stl.,

Washer, Plain, Stl., Cadmium PI.,

Pressure Switch Assy
Nut, Hex, Stl., Cadmium PI.
Bracket, Reset Switch
Reset Switch
Pilot Light, Red, 120V

Bracket, Timer
Timer, 60 Minute, 120V, Special
Screw, Mach., Rnd. Hd., St Stl.,

Screw, Mach., Rnd. Hd., St Stl.,

Electrode

Insulator, Electrode ( Not Shown)

Lead Wire, High Voltage ( Not Shown)

Lead Wire, Low Voltage ( Not Shown)
Gas Burner ( includes electrode bracket)

Gas Burner, Plain

Screw, Mach., Rnd. Hd., Stl., Cadmium PI. 1/4 - 20 x 5/8

- Washer, Plain, Stl., Cadmium PI., 1/4"
Lockwasher, Stl., Cadmium PI. 1/4"
Nut, Hex, Stl., Cadmium PI., 1/4 - 20
Elbow, Side Outlet, Malleable Iron, 3/8"
Nipple and Bracket Sub - Assy

Close Nipple, Black Iron, 3/8"

Reducing Bushing, Hex, Malleable Iron, 1/2 - 3/8"

#

47 OMS, Yellow, Nat Gas

#

Burner Orifice,

55 OMS, Purple, Lp Gas

DESCRIPTION

#

8 - 32 x 3/8

#

8

#

6 - 32 x 1/2

#

6

#

6

#

6 - 32

#

8 - 32 x 5/8

#

6 -32 x 3/8

52127

7-8

FIG. 7·3

INDEX NO.

PART NUMBER

ST-AG STEAM.fT COOKER

DESCRIPTION

45

95-3504

Burner Orifice, #31 OMS, brown (for use with manufactured

gas supply)
46
47
48
49 10-3355

50

10-1190 Plug, countersunk, malleable iron, 3/8"
10-8925

Manifold

10-3755 * Pipe Plug, steel, 1/8" IPS

Nipple, short

10-8364 Valve, gas, 3/8" NPT .
51 95-3829 . Gas Shutoff Valve Installation Kit (not shown)
52

53

10-1759

10-2505

Screw, rnd. hd., #10-32 x 3/8" stl

Lockwasher #10
54 10-2340 Nut, #10-32
55

10-2347 Stud Receiver

*NOTE: Available at local hardware store.

FIG. 7·4

INDEX NO.

S2127

PART NUMBER DESCRIPTION

1

10-1776
2 10-6765
3

4
5

10-7980

10·7981

95-3204

6 10-2666

Figure

7-4.

Door Assembly

Screw, #10-32 x 1/2" long, st. stl.
Bearing, spring pivot
Spring, door lift, left hand

Spring, door lift, right hand

Door and Spring Assy.
Gasket, door

-

1

ILLUSTRATED PARTS LIST

7-g

Figure

FIG. 7·5

INDEX NO.

1
2

3

PART NUMBER

10-2318 •

Nut, acorn, st. stl.,

10-2514" Lockwasher, internal tooth, st. stl.

95-0571 Screw, fillister hd., st. stl.,
4 95-0120 Spacer, bearing
5
6
7

8

9

10
11 10-1731 "
12
13
14 95-0134

95-0198 Bearing

10-0050

Knob, door latch

10-2517 " Lockwasher, internal tooth, st. stl., 3/8"

95-0136 Door Lock Casting AS5y.

10-2359 " Nut, acorn, alum., 1/4-20

95-0658

Stud, handle bearing
Screw, mach., rd. hd., st. stl., 1/4-20 x 5/8"

10-2513'

95-0659

Lockwasher, internal tooth, st. stl., 1/4
Handle Bearing Bracket A55Y.

Handle, door

'NOTE: Available at local hardware store.

7-5.

Door Latch Assembly

DESCRIPTION

1t10-32

H10-32

H10

x 1 3/8 (special)

.

-

S2127

7-10

OLD

STYLE

FULCRUM & DRAIN

Used from 4I7S-1018S

ST-AG STEAM-IT COOKER

ASSEMBLY

Hem

No.

Dftcriptioo

1 Fulcrum and Drain Casting .

2 '1.-20

3

4

5 10-32 Acorn Nut

6 #lO-Shakeproof Lockwasher .

7 Bronze Bearing
8 Bearing Spacer

9 10-32 MaChine Screw.
10 Roller Assembly (Items ~9) .
11

12 '1.--20

13

14 '1.-20 x

15 Drain Plug Handle
16 Drain Plug
17 '/.-20 Acorn Nul
18 Drain&Plug Handle Assy. (Complete)

'Obtain at local hardware store

NEW

FULCRUM&DRAIN

BuUt after

x

'*'

'I.'

'1.-20

'1.--20

'1.-20

Complete Fulcrum Assy. (Items 1'14) ..

Hehcoil.

Shakeproof Washer ....

Cap Screw. ',," long

1'Ii'

Machine Screw.

Allen Set Screw.. . .

Jam Nut. . .

'I>

Helicoil

:Y."

long.

STYLE

10/85

ASSEMBLY

long .....

Part No.

95-0116

10-3111

10-2513

10-1790"

10-2318

10-2514
95-0198
95-0120

10-1999
95-0149

10-1763"

10-2087

10-2358

10-3116
95-0115
95-0658

10-2227

10-2359
95-2604

I "'" • , '" I

L

@)

J

Item No. DescriptIon

1

'1.-20

x

'I>

2 10-32 Machine Screw.

3 '/.-20 Fulcrum Nul.

4 '/.-20 Allen Set Screw.
5 '/.-20 )(

6

'I,"

7 '1.-20

8

Bearing Spacer.

9 Bronze Bearing.
10 '/.-20
11

'I,"

12 '1.-20

13 #10 Shakeproof lockwasher ..
14 10-32 Acorn Nut.
15 Fulcrum and Drain Casting
16 Ball Valve

Fulcrum and Dram Assembly (Items 1-15)

Helicoll.

'\\0

~elicoil

Shakeproof Washer

Machine Screw

x

'*'

Helicoil.

Shake proof Washer................ . .

Cap Screw.

'I,'

,%"

'I,"

long

long ...

long.

Part No.

10-3116
10-1999
10-2358
10-2087
10-3111
10-2513
10-1763
95-0120

95-0198

10-3111
10-2513
10-1790
10-2514
10-2318
95-3850
10-1041
95-3992

y.

l}-B

O--®

~

FULCRUM & DRAIN ASSEMBLY

The Fulcrum and Drain Assembly is located at the lower front
of the cooking cylinder and furnishes a sturdy anchorage for
the door locking system of the door handle. Also provided in

(

this assembly is a means of adjustment for the door seal. The
drain port and drain plug provide8means of discharging
accumulations of water from the cooking cylinder.

ROlLER ASSEMBLY
Built Prior to 10/85 (Items 5. 6. 7. 8
Built after 10/85 (Items

2. 8. 9. 13&14)

&

g)

The Roller AssemlJly must be kept free-rolling at all times

Should this assembly be allowed to become frozen due to
lack of lubrication. undue strain will be put on the door
handle and the fulcrum casting while the door is being
locked. Use only a dry lubricant such as graphite. as oil or
grease wilt tend to attract dirt to this area.

S2127

7-11

NEW STYLE ExHAUST VALVE-BUILT AFTER JULY 1983

2 (See Note #2)

-1

f;

f

4

~~~h-I'

: I

I I

ST-AG STEAM-IT COOKER

~

-

--~\-----'--

,_ ~. C~

i

I

- - - _-.J

.--'

,--

------

----,

~"",

r----'.L------ ~~
I

~ - -J----~<"-/-

Item No. Description Part No.

I Assy piping exhaust, 120V 60Hz C95-3995
2 Heat Deflector Plate C95-3990
3 Tubing, Pressure Gauge A95-3270
4 Pem. Conn. Brass, !l8 I.P.S. x 3/160.0... 10-3361
5

90' Comp.
6 Tee reducing - brass (existing) 10-3432
7 Nipple, brass chr, pl. (existing) 10-3420
8 Marr Connector 10-5143
9 Plug, Countersunk. 114I.P.S. br. chr. pl. PQ9-4838

10 Packing, corrugated carton (8 x 8 x 6) 10-1643
II Silencer, exh., Steam-It 10-4963
12 Exhaust Valve only 120V 60Hz 09-6544

118

I.P.S. male

3116

0.0.

10-3360

~~CJNl1.~-::; :~

~=:2:-..:,\

/1. . '" \

k .

\,-,-'

~--~

\\J..----==~

Qty.

I

I

I
I
I

Ref
Ref

2

I

I

I
I

r

I

ST-E Application Only (Ref)

_L~_

<,

--'>"-- ...•

Replacement Instructions

A. Disconnect fitting pressure gauge
B. Remove flue enclosure.
C. Remove old exhaust valve by unscrewing 114I.P.S. nipple from cylinder.
O. Remove safety reliefvalve assy. from II2I.P.S. nipple.
E. Remove all fittings from the reducing tee and remove tee and nipple by

unscrewing nipple from cylinder, remount nipple and tee in the front

1/4 I.P.S. tap hole.(Note that the use of the rear 1/4 I.P.S. tap hole is

eliminated, install plug as shown).

F. Mount new exhaust valve assy. on to 112I.P.S. nipple previously used to

mount safety relief valve. (Before mounting exhaust valve assy. install

heat deflector plate on valve as shown)
G. Reconnect
H. Remount flue enclosure.
I. Install all new fittings, tubing, and wire joints as shown.

0\'--------''--

1140.0.

tubing (Steam pressure line) as shown.

S2127

NOTES:

I. All parts shown potted are existing, to be reused with new assy.

2. Do not remove knockout from item # 2 for ST-AG units.

3. All items (except ref. items) and one print of this drawing to be

included with this kit (item # 10 used for shipping).