SN-5G, SC-7G and SC-10G
GAS FIRED CONVECTION STEAMER
INSTALLATION – OPERATION – MAINTENANCE
BLODGETT OVEN COMPANY
44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone (800) 331-5842, (802) 860-3700 Fax: (802) 864-0183
S00041 Rev A (9/04)
TABLE OF CONTENTS
DESCRIPTION
PAGE
1.0 Service Connections ...............................................................................................4
2.0 Installation ...............................................................................................................6
3.0 Performance Check ..............................................................................................11
4.0 Operation Instructions ............................................................................................12
5.0 Periodic Maintenance ...........................................................................................15
6.0 Deliming Procedure ...............................................................................................18
7.0 Troubleshooting ......................................................................................................19
3
1.0 SERVICE CONNECTIONS – SN-5G
Unless otherwise specified, Field Wire Electrical Connection to be 120 Volts, 60 Hertz single phase with grounding wire. Furnished with 6 foot cord
with 3 prong plug. Maximum amps 2.0.
DRAIN: 1"IPS piped to open floor drain. No Solid Connection. 24" length before open air gap opening. (No bends or elbows)
GAS CONNECTION: 3/4"IPS supply line required.
D
GENERATOR WATER: 3/8" O.D. tubing at 25-50 PSI(170-345 kPa)
G
C
CONDENSING WATER: 3/8" O.D. tubing at 25-50 PSI(170-345 kPa)
WATER QUALITY STATEMENT
Water quality is the major factor affecting the performance of your appliance. If you are unsure of water quality, consult a
local water treatment specialist and have the water analyzed. Your water supply must be within these general guidelines:
Total dissolved solids
Total alkalinity
Silica
Chlorine
pH Factor
Less than 60 PPM
Less than 20 PPM
Less than 13 PPM
Less than 1.5 PPM
7.0-8.5
Water which fails to meet these standards should be treated by installation of water conditioner.
FAILURE OR MALFUNCTION OF THIS APPLIANCE DUE TO POOR WATER QUALITY IS NOT COVERED UNDER WARRANTY.
MODEL
GAS SUPPLY
SUPPLY PIPE PRESSURE (W.C.)
BTU/HR.
45,000
kW/HR.
13.2
SN-5G
Natural
6.0-13.8"(150-350mm)
Propane
11.0-13.8"(280-350mm)
24 [610]
1.75 [44]
C
3 [76]
G
3.50 [89]
DIMENSIONS ARE IN INCHES [MM].
5.25 [133]
D
9 [229]
SAFETY RELIEF
VALVE
SAFETY RELIEF
VALVE
G
C
D
4 [102]
MIN.
16 [406]
4
SERVICE CONNECTIONS – SC-7G and SC-10G
Unless otherwise specified, Field Wire Electrical Connection to be 120 Volts, 60 Hertz single phase withgrounding wire. Furnished with 6 foot cord
with 3 prong plug. Maximum amps 4.0.
DRAIN: 1"IPS piped to open floor drain. No Solid Connection. 24" length before open air gap opening. (No bends or elbows)
GAS CONNECTION: 3/4"IPS supply line required.
GENERATOR WATER: 3/8" O.D. tubing at 25-50 PSI(170-345 kPa)
CONDENSING WATER: 3/8" O.D. tubing at 25-50 PSI(170-345 kPa)
WATER QUALITY STATEMENT
Water quality is the major factor affecting the performance of your appliance. If you are unsure of water quality, consult a
local water treatment specialist and have the water analyzed. Your water supply must be within these general guidelines:
Total dissolved solids
Total alkalinity
Silica
Chlorine
pH Factor
Less than 60 PPM
Less than 20 PPM
Less than 13 PPM
Less than 1.5 PPM
7.0-8.5
Water which fails to meet these standards should be treated by installation of water conditioner.
FAILURE OR MALFUNCTION OF THIS APPLIANCE DUE TO POOR WATER QUALITY IS NOT COVERED UNDER WARRANTY.
GAS SUPPLY
MODEL
BTU/HR.
90,000
kW/HR.
26.4
SUPPLY PIPE PRESSURE (W.C.)
Propane - min. 11"(279mm)
Propane - min. 11"(279mm)
SC-7G
Natural - min. 6"(152mm)
Natural - min. 6"(152mm)
SC-10G
90,000
26.4
DIMENSIONS ARE IN INCHES [MM]
24 [610]
2.75 [70] SC-7G
1.75 [44] SC-10G
12 [305]
4 [102] SC-7G
3 [76] SC-10G
3.50 [89]
9 [229]
6.25 [159] SC-7G
5.25 [133] SC-10G
SAFETY RELIEF
VALVE
1.75 [44]
REAR FLANGED FOOT DETAIL
2 EQUALLY SPACED
Ø7/16" [11mm] HOLES
ON 2.5 [63] B.C.
5
2.0 INSTALLATION
GENERAL
NOTICE: If this equipment is being installed at over 2,000 feet altitude and was not so
specified on order, contact service department. Failure to install with proper orifice sizing
may void the warranty.
Installation must conform with local codes, or in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane
Installation Code, CSA B149.1, as applicable.
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 psi
(3.5 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 psi (3.5 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, or the Canadian
Electrical Code, CSA C22.2, as applicable.
Ventilation must be provided in accordance with local codes, or in the absence of local
codes, with ANSI/NFPA 96 Standard for Ventilation and Fire Protection of Commercial
Cooking Operations.
WARNING: Electrical grounding instructions - units 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 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.
6
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.
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, 3 inches on left side, 8 inches on right
side and 6 inches 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.
2.
3.
Uncrate carefully. Report any hidden freight damage to the freight company
immediately.
Set the unit in place. Be certain to maintain the minimum clearances from
combustibles and non-combustibles.
Level appliance using spirit level. Should flanged adjustable feet be provided,
anchor to floor using proper anchoring devices.
4.
5.
Seal bolts and flanged feet with Silastic or other equivalent compound.
Be certain to leave adequate clearances for cleaning, maintenance and service.
7
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 between 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 Propane on
all threaded connections. A manual gas shut off valve for each compartment is supplied
with the unit.
Test pipe connections thoroughly for gas leaks.
All the connections must be checked for leaks, after the unit has been put in operation.
Use soapy water only for testing on all gases. Never use an open flame to check
for gas leaks.
NOTE: If applicable, the vent from the gas appliance pressure regulator shall be installed
to the outdoors in accordance with local codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1 or the Natural Gas Installation Code CAN/CGA-
B149.1 or the propane installation code, CAN/CGA-B149.2, as applicable.
8
ELECTRICAL CONNECTION
WARNING: Do not connect the appliance to the electrical supply until after the gas
connection has been made.
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.
PLUMBING CONNECTIONS
WARNING: Plumbing connections must comply with applicable sanitary, safety and
plumbing codes.
Two water lines are provided, one for each compartment. Connect water supply line to
the 3/8" copper tube in at the rear of the steamer. The 3/8" copper tube supplies water
to both the generator tank and to condense live steam entering the drain line.
DRAIN CONNECTIONS (FIGURE 2)
The drain connection must be 1" IPS
vertically down, preferably with one elbow
only, and maximum length of 6 feet, piped
to an open air gap type drain.
CAUTION: In order to
avoid any back pressure
in the steamer, do not
connect solidly to any
drain connection.
9
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 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.
WATER CONDITIONING
It is important that the water supply connected to this steamer be softened to no more
than 2.0 grains of hardness and have a pH of 6 to 7.5. 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 boiler. Due to the temperatures in the boiler, 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 will bridge across the
probe insulator from the metal extension which senses the water level in the boiler shell.
Once this scale becomes wet, the water level control is unable to maintain the proper
water level in the boiler.
STRAINERS and FILTERS will NOT remove minerals from the water.
10
3.0 PERFORMANCE CHECK
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. After approximately 19 minutes, the “READY” light
should come on, indicating that the water temperature is 205º Fahrenheit (97º
Celsius).
3. Check that “Ignition” light comes on and cycles “ON” and “OFF”.
4. When the “READY” light comes on, 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 be illuminated and steam
should be heard entering the compartment after about 45 seconds.
1. Ensure that water from cold water condenser is flowing through the drain line.
2. Open compartment door and observe that steam supply to chamber is cut off.
“READY” light should again come on as “COOKING” light goes “OFF”.
Close compartment door and let cooking cycle finish. When the timer returns to “0"
position, a buzzer will sound signaling the end of the cooking cycle. Buzzer must be
manually turned off by setting the timer to its “OFF” position.
11
4.0
OPERATION INSTRUCTIONS
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
when opening door.
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.
CONTROLS
Ready Pilot Light
When lit, indicates steam chamber has reached 205º Fahrenheit (97º Celsius) and is
ready for the cooking cycle.
Cooking Pilot Light
When lit, indicates that a cooking cycle is in progress.
Timer
Set the cooking time (0 to 60 minutes) - steam cooking will begin when the door is
closed. The cooking cycle will be interrupted if the door is open during the cooking
cycle; resume cooking by closing the door.
Main Power Switch
ON - The boiler will automatically fill and begin heating to the pre-set temperature.
OFF - The boiler will drain.
DELIME - Closes the drain valve while CLR liquid is being poured into the generator
during the Delime procedure.
Ignition Light
When lit, indicates burners have been ignited and are heating the generator tank.
WARNING: In the event of main burner ignition failure, a 5 minute purge
period must be observed prior to re-establishing ignition source. If so
equipped, some units will automatically re-attempt ignition.
12
WARNING: In the event a gas odour is detected, shut down equipment at
the main shut off valve and contact the local gas company or gas supplier
for service.
LIGHTING
1. Ensure power, gas and water supply is on.
2. Turn power switch “ON”.
3. Generator tank will begin filling with water.
4. Once water level has been reached, the ignition light should come on and remain on
until ready light comes on.
5. Steamer is now ready for use.
SHUTDOWN
STAND BY
1. Set timer to “OFF” position and leave door slightly open.
COMPLETE SHUTDOWN
1. Set timer to “OFF” and turn power switch “OFF”. Generator will drain automatically.
2. Turn water supply “OFF”.
3. Turn gas supply “OFF”.
4. Disconnect power supply.
13
STEAM COOKING
Your steamer efficiently cooks vegetables or other foods for immediate serving. Steam
cooking should be carefully time controlled. Keep hot food holding time to a minimum to
produce the most appetizing results. Prepare small batches, cook only enough to start
serving, then cook additional amounts to meet demand. Separate frozen foods into
smaller pieces to allow more efficient cooking.
Use a pan cover for pre-cooked frozen dishes that cannot be cooked in the covered
containers in which they are packed if they require more than 15 minutes of cooking
time. When cover is used, approximately one-third additional cooking time is necessary.
Cooking time for frozen foods depends on amount of defrosting required. If time
permits, allow frozen foods to partially thaw overnight in a refrigerator. This will reduce
their cooking time.
PREPARATION
Prepare vegetables, fruits, meats, seafood and poultry normally by cleaning, separating,
cutting, removing stems, etc. Cook root vegetables in a perforated pan unless juices are
being saved. Liquids can be collected in a solid 12" x 20" pan placed under a perforated
pan. Perforated pans are used for frankfurters, wieners and similar items when juices do
not need to be preserved. Solid pans are good for cooking puddings, rice and hot
breakfast cereals. Vegetables and fruits are cooked in solid pans in their own juices.
Meats and poultry are cooked in solid pans to preserve their own juices or to retain
broth. Canned foods can be heated in their opened cans (cans placed in 12" x 20" solid
pans) or the contents may be poured into solid pans.
PAN
The steamer compartment is designed to accept combinations of the pan of 12" x 20"
(either solid or perforated) as shown on the following Table 1.
TABLE 1
NUMBER OF PANS
SN-5G
SC-7G
SC-10G
DEPTH
Top
Bottom
Top
Bottom
OF PAN
Compartment Compartment Compartment Compartment
1"
2 ½"
4"
10
5
3
6
3
2
1
8
4
2
2
10
5
3
10
5
3
6"
2
2
2
14
5.0 PERIODIC MAINTENANCE
NOTICE: As a safety precaution, disconnect the power supply during cleaning
or servicing.
CLEANING
At the end of each day, or between cooking cycles if necessary:
1. Turn main power switch OFF.
2. Remove pans and racks from compartment and wash in sink.
3. Wash compartment interior with clean water.
4. Use warm soapy water with a cloth or sponge to clean exposed bead of door gasket,
rinse with warm clear water and wipe with a dry cloth.
Wipe surfaces which touch door gasket with a cloth or sponge and warm soapy
water, rinse with warm clear water and wipe with a dry cloth. Do not apply food
oils or petroleum solvents or lubricants directly to door gasket or surfaces
which touch door gasket.
5. Remove drain screens from inside compartment drains. Using a plastic bottle brush
and mild detergent, clean inside the drain opening ensuring there is no food residue
or blockage. Clean the drain screen and replace in its original position.
6. Leave door slightly open when steamer is not in use.
CAUTION: Do not use cleaning agents that are corrosive.
NOTICE: Contact the factory, the factory representative or a local service company to
perform maintenance and repairs should the appliance malfunction. Refer to warranty
terms.
15
CLEANING
Weekly, or more often if necessary:
1. Clean exterior with a damp cloth and polish with a soft dry cloth.
2. Use a non-abrasive cleaner to remove discolorations.
3. Clean around burner air mixer and orifice if lint has accumulated. Side cover must
be removed to clean this area.
Monthly:
1. Clean around burner air mixers, louvered panels if grease or lint has accumulated.
Following daily and period maintenance procedures will enhance long-life for your
equipment. Climatic conditions - salt air - may require more thorough and frequent
cleaning otherwise the life of the equipment could be adversely affected.
It is NOT RECOMMENDED to use cleaning agents that are corrosive.
Use of cleaning agents that contain chloride, acids or salts which are corrosive may
cause pitting and corrosion when used over a period of time; this will reduce the life of
the appliance.
Should pitting or corrosion occur, this is not covered by warranty.
Follow the recommended cleaning instructions. Use a mild detergent, warm water and
rinse thoroughly.
NEVER SPRAY WATER INTO ELECTRIC CONTROLS.
16
MAINTENANCE
STAINLESS STEEL
To remove normal dirt, grease or product residue from stainless steel, use ordinary soap
and water (with or without detergent) applied with a sponge or cloth. Dry thoroughly with
a clean cloth. Never use vinegar or any corrosive cleaner.
To remove grease and food splatters or condensed vapours that have baked on the
equipment, apply cleanser to a damp cloth or sponge and rub cleanser on the metal in
the direction of the polishing lines on the metal. Rubbing cleanser as gently as possible
in the direction of the polished lines will not mar the finish of the stainless steel. NEVER
RUB WITH A CIRCULAR MOTION.
Soil and burnt deposits which do not respond to the above procedure can usually be
removed by rubbing the surface with SCOTCH-BRITE scouring pads or STAINLESS
scouring pads. DO NOT USE ORDINARY STEEL WOOL as any particles left on the
surface will rust and further spoil the appearance of the finish. NEVER USE A WIRE
BRUSH, STEEL SCOURING PADS (EXCEPT STAINLESS), SCRAPPER, FILE OR
OTHER STEEL TOOLS. Surfaces which are marred collect dirt more rapidly and
become more difficult to clean. Marring also increases the possibility of corrosive attack.
Refinishing may then be required.
TO REMOVE HEAT TINT
Darkened areas sometimes appear on the stainless steel surface where the area has
been subjected to excessive heat. These darkened areas are caused by thickening of
the protective surface of the stainless steel and are not harmful. Heat tint can normally
be removed by the foregoing, but tint which does not respond to this procedure calls for
a vigorous scouring in the direction of the polish lines using SCOTCH-BRITE scouring
pads or a STAINLESS scouring pad in combination with a powdered cleanser. Heat tint
action may be lessened by not applying or by reducing heat to equipment during slack
periods.
REMOVAL OF SCALE DEPOSITS
It is recommended that your steamer be delimed once a month, or more often if
necessary.
Should your steamer develop a heavy build-up of lime scale deposits, use the CLR
TREATMENT KIT available from your authorized servicer.
Before beginning deliming procedures, ensure that the water is not overflowing into the
cooking compartment.
17
6.0 DELIMING PROCEDURE (For units equipped with this feature)
WARNING: Read and follow instructions on the CLR bottle. Use plastic or
rubber gloves to avoid skin contact. If CLR comes in contact with skin,
rinse with clean water.
1. Drain steam generator by setting power switch to “OFF”, set cooking timer to 0.
2. Turn power switch to DELIME.
3. Unscrew brass deliming cap on right side of steamer. Insert hose in hole of port.
Pour 20 ounces of solution into generator slowly to avoid spillage. Remove hose.
Screw deliming cap on so it seals tightly. Turn power switch to on
4. Allow steamer to remain in ready cycle for ½ hour, then turn power switch “OFF” and
allow generator to drain.
5. Flush cycle. Turn power switch to “ON”. When ready light comes on, switch to
“OFF” to flush generator. Repeat this step three times to completely flush generator.
6. Clean exterior and interior. Use a mild solution of soap and water. Rinse with clean
water. Dry with a soft cloth. LEAVE COMPARTMENT DOOR OPEN WHEN NOT
IN USE.
7. The steamer is now ready for use. Turn off for overnight shutdown.
18
7.0 TROUBLESHOOTING
ADJUSTMENTS
WARNING: At least twice a year, have an authorized service person clean and adjust the
unit for maximum performance.
WARNING: Adjustments and service work may be performed only by a qualified
technician who is experienced in, and knowledgeable with, the operation of commercial
gas cooking equipment. However, to assure your confidence, contact your authorized
service agency for reliable service, dependable advice or other assistance, and for
genuine factory parts.
All units are adjusted at the factory. In case of operation problems at initial installation,
check type of gas and manifold pressure and compare it with information on rating plate.
TROUBLESHOOTING
Burner does not come on:
1. Gas supply to unit is “OFF”.
2. Manual shut off valve is “OFF”.
3. Power switch is not turned “ON”.
4. Probe not sensing the water level, will not call for ignition.
5. Ignitor or ignition module not functioning.
Burner produces carbon deposits:
1. Wrong orifice size.
2. Wrong gas supply.
3. Incorrect pressure at supply.
4. Dirty primary air openings.
5. Note enough primary air.
19
Water flows into cooking compartment:
1. Shortage of circuit at operating probe and body.
2. Scale build-up on operating probe inside generator.
3. Water fill solenoid valve is open, plugged or defective.
These problems are an indication of severe harmful water conditions which should be
corrected immediately to avoid damage to the components and performance of the
steamer.
Door leaks:
1. Check for damage to door gasket.
2. Clogged compartment drain or plumbing.
Water accumulates in the compartment:
1. Compartment drain clogged.
Water flows into drain during shut down:
1. Condensate solenoid valve is not closed, check for scale or foreign particles lodged
in diaphragm or core tube of valve.
Water not being supplied to generator:
1. Water supply is “OFF”.
2. Supply water pressure too low.
3. Defective water fill solenoid valve.
4. Probes not sensing water, thereby not operating fill solenoid.
5. Check that drain solenoid is closed.
20
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