Crown SCX-16 User manual

MANUAL 10061R1
INSTALLATION & OPERATION
MANUAL
Steam Coil Cabinet Base Convection Steamer
SCX-16
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.
IMPORTANT FOR FUTURE REFERENCE
Please complete this information and retain this
manual for the life of the equipment:
Model #: ___________________________
Serial #: ___________________________
Date Purchased: ____________________
CROWN FOOD SERVICE EQUIPMENT
A Middleby Company
70 Oakdale Road, Downsview (Toronto) Ontario, Canada, M3N 1V9
Telephone: [phone] www.crownsteamgroup.com
Printed in Canada

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 22006-07-14
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.
CAUTION: Operating, testing, and servicing should only be
performed by qualified personnel.
NOTICE: Contact the factory, the factory representative or local
service to perform maintenance and repairs.
Do not attempt to operate this unit in the event of power failure.
Intended for commercial use only. Not for household use.
This manual should be retained for future reference.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 32006-07-14
TABLE OF CONTENTS
DESCRIPTION PAGE
Important Notes ...........................................................2
Service Connections ........................................................4
Introduction ...............................................................5
1.0 Installation Instructions ...................................................6
2.0 Information to Steam Fitter ................................................8
3.0 Operating Instructions ..................................................11
4.0 Periodic Maintenance ...................................................13
5.0 Cleaning Instructions ...................................................16
6.0 Troubleshooting .......................................................17

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 42006-07-14
SERVICE CONNECTIONS

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 52006-07-14
INTRODUCTION
DESCRIPTION
Model SCX-16, convection steamer mounted on cabinet base and a steam coil boiler, designed
to ASME Code and approved as a steam boiler restricted to operation at pressure not to
exceed 15 psi. The steamer has two compartments, each with a pan capacity of 16 (1") pans,
8 (2½”) pans and 4 (4") pans.
BASIC FUNCTION:
The sequence of operation is as follows:
1. Turn on the main power switch. A green pilot light will indicate main power is on and steam
generating will begin. In approximately 20 minutes, sufficient amount of pressurized steam
will have been generated in the heat exchanger and the READY pilot light will come on.
OFF shuts off the steam supply to the boiler and opens the automatic blowdown valve, if so
equipped, emptying the boiler and releasing water and steam to the drain. The manual
blowdown valve will have to be opened to drain if not equipped with automatic blowdown
valve.
2. Boiler pressure gauge should read 9 - 11 psi during operation, 0 psi during shutdown.
3. The compartment cooker is ready for use when the READY light is on. Place pans of food
to be cooked into compartment(s) and close door(s).
4. Set timer(s) to cook time desired. Compartment will pre-heat to 185°F before the timer will
start. The pre-heat thermostat allows for varying product and size of portions to be cooked.
Cooking will commence and cooking time may be interrupted at any time by opening door(s)
and resumed again by closing door(s).
5. The buzzer will sound indicating the end of the cooking cycle and that steam has stopped
entering the compartment(s). The COOKING pilot will go off and the READY light will come
on. Turn the timer(s) to the OFF position to stop the buzzer.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 62006-07-14
1.0 INSTALLATION INSTRUCTIONS
GENERAL
The steam boiler is designed to ASME Code and approved as a steam heating boiler restricted
to operation at pressure not to exceed 15 psi.
INSTALLATION
UNPACKING
Immediately after unpacking, check for possible shipping damage. If the appliance is found to
be damaged, save the packaging material and contact the carrier within 15 days of delivery.
Before installing, verify the electrical rating agrees with the specification on the rating plate.
LOCATION
Position the appliance in its installation location. Check that there are sufficient clearances to
service the controls, door swing, etc. Also adequate clearance must be left for making the
required supply and drain connections.
Allow enough space between any other piece of equipment or wall for service access. Service
to the controls may be required on the left and/or right side panels of the cabinet.
INSTALLATION CODES AND STANDARDS
The appliance must be installed in accordance with:
In Canada:
Provincial and local codes, or in the absence of local codes, with the Canadian Electric Code,
CSA C22.1 (latest edition). Copies may be obtained from the Canadian Standard Association,
178 Rexdale Blvd., Etobicoke, Ontario, Canada, M9W 1R3.
In the U.S.A.:
State and local codes, or in the absence of local codes, with the National Electrical Code,
ANSI/NFPA-70 (latest edition). Copies may be obtained from The National Fire Protection
Association, Batterymarch Park, Quincy, MA, 02269.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 72006-07-14
1.0 INSTALLATION INSTRUCTIONS (Continued)
Ideally an exhaust system should be located directly above the appliance to exhaust steam and
heat generated by the appliance.
1. Set the unit in place and level using a spirit level.
2. Ascertain that a floor drain (open gap) is convenient to the appliance drain.
3. Mark hole locations on floor through anchoring holes provided in flanged adjustable feet.
4. Remove appliance and drill holes in locations marked on floor and insert proper anchoring
devices.
5. Set unit back in position and re-level left to right and front to back.
6. Bolt and anchor appliance securely to the floor.
7. Seal bolts and flanged feet with Silastic or equivalent compound.
8. Make service connections as indicated.
WARNING: Electrical and grounding connections must comply with
applicable portions of the National Electrical Code and/or other local
electrical codes.
WARNING: Disconnect electrical power supply and place a tag on
the disconnect switch to indicate that you are working on the circuit.
Use copper wire suitable for at least 200 degrees Fahrenheit (90 degrees Celsius). The
steamer must be grounded. The wiring diagram is located on the inside right hand panel as
you face the steamer.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 82006-07-14
2.0 INFORMATION TO STEAM FITTER
1. Assuming availability of 30 psi supply steam pressure immediately to the appliance, then
pipe sizes of ½" or 3/4" or 1" will deliver respectively 90, 165 or 385 lbs. of steam per
hour to the appliance Heat Exchanger. From the foregoing to use ½" pipe line would
most likely prove inadequate.
An extremely important consideration is the pressure drop that will occur through the steam
supply line from its point of origin to the appliance. The greater the length of piping and
number of valves and elbows, the greater will be the pressure losses.
Consider a pressure drop of 1 (one) psi for each straight length of pipe equivalent to 120
diameters of that pipe. Thus, a 1" pipe having a straight length of 120" (10 feet) is
equivalent to 120 diameters of that pipe and will have a pressure loss of 1 psi through that
pipe.
Example:

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 92006-07-14
2.0 INFORMATION TO STEAM FITTER (Continued)
1. Note, in 3/4" pipe size, that a Standard 90º Elbow and Angle Valve and a Globe Valve are
equivalent to 1.8 feet, 10 feet and 18 feet respectively of straight pipe.
Similarly, in a 1" pipe size, a standard 90º Elbow and Angle Valve and a Globe Valve are
equivalent to 2.2 feet, 12 feet and 23 feet respectively of straight pipe.
Example:
Total of above = 20 + 2.2 + 3 + 2.2 + 17 + 23 + 10 + 2.2 = 79.6 feet. Since each 10 feet is
equivalent to 1 psi pressure loss, 79.6 feet is equivalent to approximately 32 psi from an
original Boiler supply of 40 psi.
It is suggested that, wherever possible, the steam supply line to the appliance is a separate
line from the steam source. If the appliance must be supplied from a line supplying other
appliances, the pipe sizes and pressure will have to be verified. Further, during idle periods,
when the steam in the supply line is not in use, water will form from condensed steam in the
supply line. It is advisable to prevent water pockets from forming in the steam line and
impeding the steam flow when it is required. Therefore, the steam supply line should be
installed level or run slightly downwards towards the appliance. Install a Ball Float Trap
near the appliance to drain out water (condensed steam) from the line to assure clean dry
steam to the appliance.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 10 2006-07-14
2.0 INFORMATION TO STEAM FITTER (Continued)
PLUMBING CONNECTIONS
Water Supply Connection
The incoming cold water supply connection, at the rear of the boiler cabinet, requires 3/8"
tubing and water pressure of 25 - 50 psig. A manual shut-off valve must be provided
convenient to the boiler; this valve should be open when the boiler is in operation.
Drain Connection
The boiler drain (2" IPS) should be piped to a floor drain near the boiler. There should be no
solid drain connection; an “open gap” between the boiler and the floor drain is required.
WARNING: Plumbing connections must comply with applicable sanitary,
safety, and plumbing codes.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 11 2006-07-14
3.0 OPERATING INSTRUCTIONS
START UP INSTRUCTIONS
Turn on water and steam supply to appliance. Open cabinet door and turn on Power Switch.
Pilot light will come ON and steam generating will begin. In approximately 20 minutes,
sufficient amount of pressurized steam will have been generated in the heat exchanger. The
appliance is now ready for steam generation.
SHUT DOWN
Turn off power switch, open manual drain valve. If unit is equipped with automatic blowdown
valve, it will open and drain exchanger. Steam valve will close cutting off supply to exchanger.
COOKER SECTION
CAUTION: Live steam and accumulated hot water in the
compartment may be released when the door is opened.
Start-up procedures for your steamer must be completed once daily prior to operation (see
instruction plate or above for boiler start up procedures).
With ready pilot light on, preheat steamer compartment for one minute when the steamer is to
be first used for the day or whenever the compartment is cold.
1. Close compartment doors and set timer to “1 minute”.
2. When buzzer sounds, set timer to the “OFF” position.
3. Steamer is now ready for cooking.
4. With cooking compartment preheated and ready pilot light on, place pans of food to be
cooked into compartment and shut door.
5. Set timer to cooking time desired. Cooking cycle may be interrupted at any time by opening
door and resumed again by closing door.
6. When buzzer sounds, it indicates the end of the cooking cycle and that no more steam is
entering the compartment. Cooking pilot light will go off and ready pilot light will come on.
Buzzer must be shut off by turning the timer to its off position.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 12 2006-07-14
3.0 OPERATING INSTRUCTIONS (Continued)
CAUTION: An obstructed drain can cause personal injury or
property damage.
Frequently check that the compartment drain and plumbing is free of all obstructions. Never
place food containers, food or food portion bags in the cooking compartment in such a way that
the compartment drain becomes obstructed.
SHUT DOWN
1. To shut down cooking compartment, set timers to their OFF position and leave doors
slightly open.
2. At the end of the day, the steam supply must be shut off. Open the door of cabinet base
and turn off power switch. Open manual drain valve. If unit is equipped with automatic
blowdown valve, it will open and drain the boiler.
CAUTION: If steam supply does not shut off during blowdown,
immediately discontinue use of appliance and call for service.
Each compartment is equipped with a removable drain screen. Frequently
check the drain screen for accumulation of food particles. Should food
particles accumulate against, or clog the drain screen, remove it, clean it
thoroughly and then replace it in its original position.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 13 2006-07-14
4.0 PERIODIC MAINTENANCE
CAUTION: Protect yourself. When flushing control, hot water and
steam will flow out of the drain.
Be sure to flush your boiler water level control daily. Failure to follow this procedure can cause
the control to malfunction resulting in serious boiler damage.
The Boiler Water Level Control installed on your boiler requires periodic maintenance. As boiler
water circulates into the float chamber, sand, scale and other sediment may be deposited in the
float chamber. While the chamber has been designed with a large accumulation bowl, it is
necessary to flush the sediment from the chamber by blowing down the control so that the
accumulation of sediment does not interfere with the movement of the float in the control.
Control must be flushed at least once a day.
When flushing control, note water level in gauge glass, allow the boiler to fill if necessary, and
also to come up to temperature.
Before flushing control, note that water level in gauge glass is within operating range and the
boiler pressure is at least 6 psi. While the boiler is being operated, open blowdown valve at
bottom of control by rotating the handle counterclockwise about 1/4 turn to fully open the valve.
Opening the blowdown valve also checks the cut-off operation. Float should drop shutting
steam off, hot water and steam will flow out the drain flushing away sediment.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 14 2006-07-14
4.0 PERIODIC MAINTENANCE (Continued)
CAUTION: If steam supply does not shut off during blowdown,
immediately discontinue use of appliance and call for service.
Continue draining water for about fifteen (15) seconds, from control until water is clean.
Manually close valve. Recheck gauge glass. If water level has dropped significantly, wait for
the boiler to restore water level and pressure and repeat if necessary.
PERIODIC MAINTENANCE
1. Water level control should be opened daily to blowdown sediment and scalant.
2. Observe that the water in gauge glass is clean and clear. Extreme murkiness in water
indicates inadequate water quality.
3. Safety valve should be tripped during operation once a week to assure that it functions
properly.
4. De-scaling is based on water quality and usage.
CAUTION: Take extra caution when blowing down water level
control or tripping safety valve as extreme hot water and live steam
are present.
CAUTION: Disconnect the power supply during cleaning or
servicing.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 15 2006-07-14
DESCALING BOILER
CAUTION: Improper use of this procedure may damage your
appliance!
1. With Generator tank empty, close manual blowdown valve.
If appliance is equipped with Automatic Blowdown, turn water supply OFF to appliance.
Turn power switch ON, this will energize and close blowdown valve.
2. Remove 3/4" pipe cap from fitting located at top front of generator tank.
3. Insert appropriate hose or tube through opening in generator tank and pour in (½) half U.S.
gallon of CLR Descaling Solution.
4. Replace 3/4" pipe cap OR union fitting.
5. Open water supply to appliance allowing water to fill Generator tank to required level. On
appliances with Manual Blowdown, turn ON power switch, Boiler will fill to the required level.
6. Let appliance cycle, allow two hours for descaling and cleaning. DO NOT TURN STEAM
ON.
7. Open both the blowdown and water level control valves for complete drainage and then
close both valves.
On appliances equipped with Automatic Blowdown, turn OFF power switch and open water
level control valve, this will allow complete drainage. Once drained, close water level control
valve.
8. Turn appliance switch ON. When generator tank is completely filled, turn power switch
OFF, this will rinse and drain Generator Tank. Appliances with Manual Blowdown Valve
must be opened to drain.
9. Complete Step 8 twice to assure boiler is completely rinsed.
10. Appliance is now ready for use.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 16 2006-07-14
5.0 CLEANING INSTRUCTIONS
Never spray water into electric controls.
CAUTION: Do not use cleaning agents that are corrosive.
CAUTION: Live steam and accumulated hot water in the
compartment may be released when the door is opened.
1. Keep exposed cleanable areas of unit clean at all times.
2. Thoroughly wash oven cavities, door liners, and pan racks at the end of each day or as
required with a mild detergent and water to prevent bacterial growth and odours.
3. 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.
4. Wash gasket sealing surface with mild detergent to remove harmful food acids and rinse.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 17 2006-07-14
6.0 TROUBLESHOOTING
DOOR LEAKS
1. Check for damage to door gasket.
WATER ACCUMULATES IN THE COMPARTMENT
1. Compartment drain screen clogged. Remove and clean thoroughly and then replace.
WATER NOT BEING SUPPLIED TO HEAT EXCHANGER
1. Water supply is “OFF”.
2. Defective water fill solenoid.
3. Water level control clogged or defective, unable to operate fill valve.
4. Check drain valve is closed. Also check that water level control valve is closed.
5. Supply water pressure too low.
AUTOMATIC BLOWDOWN VALVE DOES NOT DRAIN
1. Defective Blowdown valve.
2. Heat exchanger build up of scalant clogging drain lines and valve.
HEAT EXCHANGER ACHIEVES PRESSURE SLOWER THAN NORMAL
1. Heavy build up of lime on heat exchanger tubes.
2. Steam supply pressure too low.
NOTICE: Contact the factory, the factory representative or local service
company to perform maintenance and repairs. Refer to warranty terms.

INSTALLATION AND OPERATION MANUAL, STEAM COIL CABINET BASE CONVECTION
STEAMER, MODEL SCX-16
PART NUMBER 10061R1 18 2006-07-14
6.0 TROUBLESHOOTING (Continued)
SAFETY VALVE BLOWS
1. Defective safety valve.
2. Pressure too high. Pressure switch requires adjustment (lower) or may be defective.
TO CALIBRATE PRESSURE SWITCHES
Pressure switch range is from 1 to 15 psi.
Adjust all settings to maximum on high signal adjustment screw on pressure switches.
Adjust in the following sequence:
- High limit pressure switch.
- Operating pressure switch.
- Turning screw clockwise to increase, counterclockwise to decrease pressure.
- Use relief valve to release pressure from boiler for setting adjustments.
1. HIGH LIMIT PRESSURE SWITCHES
Allow pressure to build until unit shuts off. This should occur at 15 psi. Set the high signal
to switch at 14.5 psi on the gauge and the low signal to 13.0 psi.
2. OPERATING PRESSURE SWITCHES
Set the high signal to switch at 11 psi on the gauge and the low signal to 9 psi.
3. Release pressure in boiler to below 9 psi. Steam solenoid will open. Once pressure has
reached 11 psi, the steam solenoid will close. Repeat this process several times to make
sure the solenoid opens at 9 psi and closes at 11 psi.
Once completed, pressure switches have been calibrated.
NOTE: Pressure switches are factory set. Calibration is only required if
pressure switches are replaced or if adjustment is required.