Market Forge STHE-12-TGG Installation Manual
INSTALLATION AND OPERATION
MANUAL AND PARTS LIST
GAS FIRED STEAMER
MODELS: STHE-7-TGG
STHE-12-TGG
STHE-16-TGG
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 vapours and liquids in the
vicinity of this or any other appliance.
PRINTED IN CANADA
PART NUMBER 10225R0 1 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
IMPORTANT NOTES FOR INSTALLATION AND OPERATION
Retain this manual for future reference.
NOTICE
Instructions to be followed in the event that the operator of this appliance
smells gas must be posted in a prominent location. This information shall be
obtained by consulting the local gas supplier.
IMPORTANT
Do not attempt to operate this unit in the event of power failure.
Adequate clearances must be maintained for safe and proper operation.
The appliance area must be kept free and clear of combustibles.
Do not obstruct the flow of combustion and ventilation air.
Contact the factory, the factory representative or a local service company to
perform maintenance and repairs should the appliance malfunction. Refer to
warranty terms.
PART NUMBER 10225R0 2 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
TABLE OF CONTENTS
DESCRIPTION PAGE
1.0 SERVICE CONNECTIONS ................................................4
2.0 INTRODUCTION ........................................................5
3.0 PERFORMANCE CHECK ................................................12
4.0 OPERATION INSTRUCTIONS ............................................13
5.0 PREVENTIVE MAINTENANCE ............................................23
6.0 TROUBLESHOOTING ...................................................25
7.0 MAINTENANCE ........................................................33
8.0 PARTS LIST .........................................................34
PART NUMBER 10225R0 3 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
1.0 SERVICE CONNECTIONS
PART NUMBER 10225R0 4 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
2.0 INTRODUCTION
DESCRIPTION
The STHE series steamers are pressureless steam cookers consisting of two independently
controlled compartments enclosed in a single cabinet. Each compartment is equipped with a
separate heavy duty door with inner gasket plate isolated from the exterior surface. Door
latches operate by action for positive sealing of inner door. Operation 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. Two gas fired, stainless steel generators
operating at “0" psi (0 kPa) and rated at 70,000 BTU (STHE-7-TGG) or 95,000 BTU (STHE-12TGG and STHE-16-TGG) are located in the bottom cabinet and may be operated separately.
BASIC FUNCTIONING
The steamers 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.
When steam flowing inside the compartment has raised the interior temperature to 195 degrees
F, the contacts of a thermostatic switch close, completing the circuit to the timer motor and
starting the coking 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 to the generator drain box that is
automatically actuated by a thermostatic cooling valve to condense the steam to water prior to
discharge into the floor drain.
PART NUMBER 10225R0 5 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
INSTALLATION
SETTING IN PLACE
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. 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.
MECHANICAL CONNECTIONS
Since the Pressureless Cooker is interconnected at the factory to the steam boiler, no field
connections to the cooker are required. All electrical and plumbing connections are located on
the rear middle panel of the cabinet.
PART NUMBER 10225R0 6 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
2.0 GENERAL
Gas installation to conform to local codes, or in absence of local codes, with the National Fuel
Gas Code - ANSI Z223.1/NFPA 54. In Canada installation to be in accordance with the Natural
Gas and Propane Installation Code, CSA B149.1. and or local codes.
1. The appliance and its individual shut off valve must be disconnected from the gas supply
piping system during any pressure testing of that system at pressures in excess of ½ psig
(3.45 kPa).
2. The appliance must be isolated from the gas supply piping system by closing its individual
manual shut off valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than ½ psig (3.45 kPa).
Electrical grounding must be provided in accordance with local codes, or in the absence of local
codes, with the National Electrical Code ANSI/NFPA 70. In Canada, installation must be in
accordance with the Canadian Electrical Code CSA C22.2.
WARNING: Electrical grounding instructions - Units come equipped
with a three-prong (grounding) plug for your protection against
shock hazard and should be plugged directly into a properly
grounded three-prong receptacle. Do not cut or remove the
grounding prong from this plug. (120 VOLT UNITS ONLY)
WIRING DIAGRAM FOR APPLIANCE IS LOCATED ON RIGHT HAND SIDE PANEL OF THE
COOKER CABINET.
2.1 EXHAUST FANS AND CANOPIES:
Canopies are set over ranges, ovens, kettles, etc., for ventilation purposes. It is
recommended that a canopy extend 6" past the appliance and be located 6' 6" from the
floor. Filters should be installed at an angle of 45 degrees or more with the horizontal.
This position prevents dripping of grease and facilitates collecting the run-off grease in a
drip pan, usually installed with the filter. A strong exhaust fan tends to create a vacuum in
the room and may interfere with burner performance or may extinguish pilot flames.
Makeup air openings approximately equal to the fan area will relieve such vacuum. In
case of unsatisfactory performance on any appliance, check with the exhaust fan in the
“OFF” position.
2.2 WALL EXHAUST FAN:
The exhaust fan should be installed at least two feet above the vent opening at the top of
the unit.
PART NUMBER 10225R0 7 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
INSTALLATION (Continued)
2.3 CLEARANCES:
Adequate clearance must be provided in aisle and at the side and back. Adequate
clearances for air openings into the combustion chamber must be provided, as well as for
serviceability for use on noncombustible floors. Minimum clearance from combustible and
noncombustible construction, 0" on left side, 0" on right side and 6" from back.
WARNING: These procedures must be followed by qualified
personnel or warranty will be voided. An open gap floor drain is
required immediately below the appliance drain.
To Install:
1. Uncrate carefully. Report any freight damage to the freight company immediately.
2. Set the unit in place. Be certain to maintain the minimum clearances from combustibles
and non-combustibles.
3. For an appliance supplied with legs, level the appliance using a spirit level. Should
flanged adjustable feet be provided, anchor to floor using proper anchoring devices.
4. Seal bolts and flanged feet with Silastic or other equivalent compound.
5. Be certain to leave adequate clearances for cleaning, maintenance and service.
PART NUMBER 10225R0 8 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
INSTALLATION (Continued)
GAS CONNECTION:
1. The Serial and Rating Plate on the unit indicates the type of gas your unit is equipped to
burn. DO NOT connect to any other gas type.
2. A ¾” NPT line is provided at rear for the connection. Each compartment is equipped with
an internal pressure regulator which is set at 3.5" W.C. manifold pressure for natural gas
and 10" W.C. for propane gas. Use c” pipe tap on the burner manifold for checking
pressure.
An adequate gas supply is imperative. Undersized or low pressure lines will restrict the volume
of gas required for satisfactory performance. A steady supply pressure, between 6" W.C. and
14" W.C. for natural gas and 11" W.C. and 14" W.C. for propane gas is recommended. With all
units operating simultaneously, the manifold pressure on all units should not show any
appreciable drop. Fluctuations of more that 25% on natural gas and 10% on propane gas will
create problems, affecting burner operation. Contact your gas company for correct supply line
sizes.
Purge the supply line to clean out any dust, dirt or other foreign matter before connecting the
line to the unit. Use pipe joint compound which is suitable for use with Liquid Propane on all
threaded connections.
Test pipe connections thoroughly for gas leaks.
Use soapy water only for testing on all gases.
Never use an open flame to check for gas leaks.
All the connections must be checked for leaks
after the unit has been put in operation.
ELECTRICAL CONNECTION:
120 VAC-60 Hz - Single Phase
Units with this electrical rating are factory supplied with a three-wire cord and three-prong plug
which fits any standard 120V, three-prong grounded receptacle. A separate 15 amp supply is
needed for each unit.
PART NUMBER 10225R0 9 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
INSTALLATION (Continued)
PLUMBING CONNECTIONS:
WARNING: Plumbing connections must comply with applicable
Sanitary, Safety and Plumbing Codes.
Two water lines are provided. Connect water supply lines to the 3/8" copper tubes at the rear of
the steamer.
One line is for supply of water to the generator and one for cold condensate water to condense
live steam entering the drain line.
DRAIN CONNECTIONS:
Appliance drain is 2 inch pipe size. Provide open air gap type drain.
WARNING: An open gap floor drain is required immediately below
the appliance drain.
CAUTION: PVC OR CPVC are not acceptable materials for drains.
PART NUMBER 10225R0 10 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
INSTALLATION (Continued)
COLD WATER CONDENSER:
The steamer is equipped with a cold water condenser, in the rear of the cooking chamber,
which helps to condense the steam prior to discharge into the drain. The steamer freely vents
itself by the negative pressure created by the condensate water drainage. This negative
pressure prevents steam leakage around the door gasket and helps draw the steam through
the cooking compartment. Steam leakage at the door may indicate a plugged or improperly
installed drain.
Temperature of condensate water flowing through the drain is controlled by the thermostatic
cooling valve (TCV) located inside the controls compartment on the right side of the unit. The
valve has been factory set to keep condensate water flowing into the drain at or below 140°F.
Depending on local plumbing code requirements, this setting may be changed to obtain a
different maximum drainage temperature. Refer to next section Performance Check for
instructions to set the (TCV).
WATER CONDITIONING:
It is important that the water supplied to the generator be softened to no more than 2.0 grains of
hardness and have a pH of 7.0 to 8.5. This degree of hardness can be easily obtained with the
use of a properly maintained water softener. The use of a water meter will determine the water
consumption and when the water softener needs regeneration or recharging. Failure to comply
with these water condition standards may void the warranty.
Untreated water contains scale producing minerals which can precipitate onto the surfaces in
the steam generator. Due to the temperatures in the steam generator, the minerals can bake
onto the surfaces and components. This can result in early component failure and reduced
product life. Water level probes become coated with scale. Scale may bridge across the probe
insulator from the metal extension which senses the water level in the steam generator shell.
Once this scale becomes wet, the water level control is unable to maintain the proper water
level in the steam generator.
STRAINERS and FILTERS will NOT remove minerals from the water.
PART NUMBER 10225R0 11 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
3.0 PERFORMANCE CHECK
WARNING: The steamer and its parts are hot. Use care when
operating, cleaning or servicing the steamer. The cooking
compartment contains live steam. Stay clear while opening door.
Once the steamer is installed and all mechanical connections have been made, thoroughly test
the steamer before operation.
1. Check that proper water, drain and electrical and gas connections have been made.
2. Turn main power switch ON.
3. Check that “Ignition” light comes on and that burners ignite.
4. After approximately 15 minutes, the “READY” light should come on, indicating that the water
temperature has reached 205º Fahrenheit (97º Celsius). At this time, set timer to the “5
minute” position. With door open, observe that no steam is entering the compartment and
that the “COOKING” light is OFF.
5. Close compartment door. The COOKING light should now illuminate and steam should be
heard entering the compartment shortly after.
6. After five minutes of operation check that water from the cold water condenser is flowing
through the drain line.
7. Open compartment door and observe that steam supply to compartment is cut off.
“READY” light should again come on as “COOKING” light turns “OFF”.
8. Close compartment door and 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 “5-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.
9. With all compartments of the steamer operating in the cooking cycle, check the temperature
of the condensate coming out the drain. If the drain temperature exceeds local plumbing
code requirements, adjust the Thermostatic Cooling Valve (TCV) out for a lower drain
temperature and in for a higher drain temperature. A TCV setting of approximately 2.75
yields a drain temperature of 140°F. A setting of approximately 2.5 or 3 yields temperatures
of 125°F and 155°F, respectively.
PART NUMBER 10225R0 12 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
4.0 OPERATION INSTRUCTIONS
LIGHTING
1. Ensure power, gas and water supply is on.
2. Turn power switch “ON”.
3. Steam generator tanks will begin filling with water.
4. Once proper water level has been reached, the ignition light will come on and should remain
on until the ready light comes on.
5. Cooker is now ready for use.
Your steamer has been factory set, when “ON” to maintain water temperature during the
READY phase at approximately 205º Fahrenheit (97º Celsius) just below water boiling point.
WARNING: In the event of main burner ignition failure, a 5 minute
purge period must be observed prior to re-establishing ignition
source.
WARNING: In the event a gas odor is detected, shut down
equipment at the main shut off valve and contact the local gas
company or gas supplier for service.
PART NUMBER 10225R0 13 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
4.0 OPERATION INSTRUCTIONS (Continued)
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.
NOTE: Total elapsed preheating time equals the timer setting plus a short delay period
needed to activate a thermostatic switch included in the controls.
3. Turn off buzzer, which sounds to indicate cooking is complete, by setting the
Timer Dial (1) to OFF position.
COOKING
Before loading the cooker, be sure compartment is hot. See 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 Cooking Guidelines).
5. Turn off buzzer, which sounds to indicate cooking is complete, by setting timer dial (1) to
the OFF position.
6. Open door slightly 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.
PART NUMBER 10225R0 14 2010-09-07
INSTALLATION AND OPERATION MANUAL AND PARTS LIST,
MODELS: STHE-7-TGG, STHE-12-TGG, STHE-16-TGG
4.0 OPERATION INSTRUCTIONS (Continued)
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.
COMPLETE SHUTDOWN
a. Set timer to “OFF” and turn power switch “OFF”. Steam generator will drain automatically.
b. Turn water supply “OFF”.
c. Close manual gas shutoff valve.
d. Disconnect power supply.
CAUTION: When the unit is not in use, leave the cooking
compartment door slightly ajar to prolong the life of the door gasket.
CLEANING
After each period of daily operation (more frequently as required to maintain cleanliness), the
cooker should be thoroughly cleaned by completing the following steps:
1. Remove left and right side pan supports and drain screens by lifting up and off mounting
studs. Remove drain screen by pulling straight out. 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 and drain screens in compartment and leave door open.
DRAINAGE
Cooking Compartment Drainage
The bottom of the cooking compartment is angled slightly toward the rear of the unit. This
assures that any condensate build-up or spills will be directed toward the drain, which is located
at the rear bottom center of the cooking compartment. Any liquid exiting the cooking
compartment runs down the cooking compartment drain tube and into the drain line.
PART NUMBER 10225R0 15 2010-09-07
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