Blodgett SC-GH Series Owner's manual

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SC-GH SERIES
HIGH EFFICIENCY GAS FIRED CONVECTION STEAMER
INSTALLATION – OPERATION –MAINTENANCE
BLODGETT OVEN COMPANY
www.blodgett.com
44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone: [phone] Fax: [phone]
S00061 Rev D (3/13)

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IMPORTANT NOTES FOR INSTALLATION AND OPERATION
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
WARNING: Improper installation, operation, adjustment, alteration, service
or maintenance can cause property damage, injury or death. Read the
installation, operating and maintenance instructions thoroughly before
installing, operating or servicing this equipment.
FOR YOUR SAFETY: Do not store or use gasoline or other flammable
vapors or liquids in the vicinity of this or any other appliance.
PURCHASER: 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.
Intended for commercial use only. Not for household use.
This manual should be retained for future reference.
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.

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TABLE OF CONTENTS
DESCRIPTION PAGE
1.0 Service Connections ............................................................................................... 4
2.0 Installation............................................................................................................... 5
3.0 Performance Check............................................................................................... 11
4.0 Operation Instructions ........................................................................................... 12
5.0 Maintenance.......................................................................................................... 14
6.0 Deliming Procedure............................................................................................... 19
7.0 Troubleshooting..................................................................................................... 20

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1.0 SERVICE CONNECTIONS
* SC-10GH ONLY

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2.0 INSTALLATION
WARNING: Do not connect the appliance to the electrical supply until
after the gas connection has been made.
Installation must conform to local codes, or in 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
This appliance is 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. (120V units only).
WIRING DIAGRAM FOR APPLIANCE IS LOCATED ON RIGHT HAND SIDE PANEL OF
THE COOKER CABINET.

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2.0 INSTALLATION (Continued)
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.
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.

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2.0 INSTALLATION (Continued)
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.
WARNING: For an appliance equipped with casters, the installation
shall be made with a connector that complies with the standard for
connectors for moveable gas appliances, ANSI Z21.69-CSA 6.16 and a
quick-disconnect device that complies with the standard for quick-
disconnect devices for use with gas fuel, ANSI Z21.41-CSA 6.9;
adequate means must be provided to limit the movement of the
appliance without depending on the connector and the quick-
disconnect device or its associated piping to limit the appliance
movement; the location where the restraining means may be attached
to the appliance is on bottom of unit directly below relief valve.
If the unit is also equipped with an optional water fill valve it too must
be installed with a flexible water supply tube, a quick disconnect and
strain relief.
GAS CONNECTION:
CAUTION: The pipe thread compound used when installing pipes must
be a type that is resistant to the action of liquified petroleum or
propane gases.
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.

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2.0 INSTALLATION (Continued)
1.0 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.
2.0 A ¾” NPT line is provided at rear for the connection. Each compartment is equipped
with an internal pressure regulator 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 12" 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 than 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 suitable for use with Liquid Propane on all threaded
connections.
Test pipe connections thoroughly for gas leaks.
WARNING: Never use an open flame to check for gas leaks. Check
all connections for leaks using soapy water before use.
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.

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2.0 INSTALLATION (Continued)
PLUMBING CONNECTIONS:
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.
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).
NOTICE: Plumbing connections must comply with applicable sanitary, safety and
plumbing codes.

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INSTALLATION (Continued)
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 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 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.