Crown GCX-16 User manual

MANUAL 10064R2
INSTALLATION & OPERATION
MANUAL
Gas Cabinet Base Convection Steamer
GCX- GCX-24
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,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
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.
This manual should be retained for future reference.
FOR YOUR SAFETY: Do not store or use gasoline or other
flammable vapors or liquids in the vicinity of this or any other
appliance.
Intended for commercial use only. Not for household use.
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.
Keep the appliance area free and clear from combustibles.
Do not obstruct the flow of combustion and ventilation air.
Adequate clearances must be maintained for servicing and proper operation.
Do not attempt to operate this unit in the event of a power failure.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
TABLE OF CONTENTS
DESCRIPTION PAGE
Important Notes for Installation and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.0 ServiceConnections .....................................................4
2.0 Introduction............................................................4
3.0 InstallationInstructions ...................................................7
4.0 OperationInstructions . .................................................12
5.0 Operation Instructions for Boilers with CSD-1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.0 Operation Instructions, Cooker Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.0 PeriodicMaintenance ...................................................20
8.0 CleaningInstructions ...................................................23
9.0 Adjustments ..........................................................24
10.0 Troubleshooting .......................................................26
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
1.0 SERVICE CONNECTIONS
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
1.0 SERVICE CONNECTIONS
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
2.0 INTRODUCTION
DESCRIPTION
Models GCX-16 and GCX-24, convection steamers mounted on a 36" cabinet base and a gas
fired boiler rated at 300,000 BTU. GCX-16 steamer has a pan capacity of 16 (2½”) pans.
GCX-24 steamer has a pan capacity of 24 (2½") pans.
BASIC FUNCTION:
Gas Fired Steamers
The sequence of operation is as follows:
1. Turn on main power switch. Pilot light will indicate main power is on and fill solenoid will
open and water will begin to fill boiler. Allow 20 minutes to fill boiler. OFF shuts off the
boiler controls and opens the automatic blowdown valve, if so equipped, emptying the boiler
and releasing water and steam to the drain. Manual valve will have to be opened to drain
boiler if not equipped with automatic blowdown valve.
2. Boiler pressure gauge should read 9 - 11 psi during operation, 0 psi during shutdown.
3. Burners will cycle on and off as required to maintain pressure.
4. Compartment cooker is ready for use when READY light is on. Place pans of food to be
cooked into compartments and close doors(s).
5. Set timer to cooking time desired. Cooking will commence and cooking time may be
interrupted at any time by opening door and resumed again by closing door.
6. Buzzer will sound indicating the end of the cooking cycle and that steam has stopped
entering the compartment. The COOKING pilot will go off and the READY light will come
on. Buzzer must be shut off by turning the timer to its off position.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
3.0 INSTALLATION INSTRUCTIONS
GENERAL
The gas boiler is designed to ASME Code and approved as a steam heating boiler restricted to
operation at pressure not to exceed 15 psi. The gas boiler installed in a 36" cabinet base rated
at 300,000 BTU, operational on Natural or Propane gas. Boilers may have optional electronic
ignition and CSD-1 controls.
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 that the gas (natural or propane), the elevation from sea level and the
electrical supply agree with the specification on the data plate. NOTE: If this appliance is being
installed above 2000 feet altitude, contact your authorized service office to assure that the
proper orifice size for your elevation has been installed.
LOCATION
The installation location must be kept free and clear of combustibles. Do not obstruct the flow
of combustion and ventilation air. Clearance from combustible construction must be a minimum
of 3 inches from the sides and 6 inches from the back. The appliance should be installed on a
noncombustible floor. Provide adequate clearances for cleaning, maintenance, service and
proper operation.
Sufficient air should be allowed to enter the room to compensate for the amount of air removed
by any ventilating system and for combustion for the gas burners. Do not obstruct the air flow
into and around the appliance. Do not obstruct the flow of flue gases from the flue duct located
at the rear and above the cabinet. Position the appliance in its final location. Check that there
are sufficient clearances to service the controls, for door swings, etc., so there will be no
problem in making the required supply and drain connections.
Allow enough space between any other piece of equipment or a wall for service access.
Service on the cabinet base may require access to the left and/or right side panels.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
3.0 INSTALLATION INSTRUCTIONS (Continued)
INSTALLATION CODES AND STANDARDS
The appliance must be installed in accordance with:
Gas installation to 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, including:
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
(3.5 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 psig (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. In Canada, installation must be in
accordance with the Canadian Electrical Code CSA C22.2.
WIRING DIAGRAM FOR APPLIANCE IS LOCATED INSIDE CABINET DOOR.
LEVELLING AND ANCHORING THE APPLIANCE
1. Place appliance in the installation position.
2. Place a carpenter’s level on top of the appliance and turn the adjustable feet to level side-
to-side and front-to-back.
3. Mark hole locations on the floor through the anchoring holes provided in the rear flanged
adjustable feet.
4. Remove appliance from installation position and drill holes in locations marked on the floor.
Insert proper anchoring devices (not supplied).
5. Place appliance back in the installation position.
6. Place carpenter’s level on top of appliance and re-level side-to-side and front-to-back.
7. Bolt and anchor appliance securely to the floor.
8. Seal bolts and flanged feet with Silastic or equivalent compound.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
3.0 INSTALLATION INSTRUCTIONS (Continued)
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 feet 6 inches 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.
PLUMBING CONNECTIONS
WARNING: Plumbing connections must comply with applicable
sanitary, safety, and plumbing codes.
WATER SUPPLY CONNECTION
The incoming cold water supply connection, at the rear of the steamer cabinet, requires 3/8"
tubing and water pressure of 25 - 50 psi. A manual shut-off valve must be provided convenient
to the appliance; this valve should be open when the boiler is in operation.
IMPORTANT: If your equipment was supplied with split water lines and a water
treatment system, connect the system to the connection marked “FILTERED
WATER IN” only (use cold water). Make a second connection to the
“CONDENSER WATER IN” from a cold and unfiltered water supply.
FAILURE OR MALFUNCTION OF THIS APPLIANCE DUE TO POOR WATER QUALITY IS
NOT COVERED UNDER WARRANTY. SEE WATER QUALITY STATEMENT (PAGE 4).
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
3.0 INSTALLATION INSTRUCTIONS (Continued)
DRAIN CONNECTION
The steamer drain (2" IPS) should be piped to a floor drain near the steamer (NOT directly
under the steamer). There should be no solid drain connection; an “open gap” between the
steamer and the floor drain is required.
GAS CONNECTION
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.
1. The data plate on the cabinet door of the boiler indicates the type of gas your unit is
equipped to burn. DO NOT connect to any other gas type.
Keep the appliance area free and clear from combustible substances. Do not obstruct
the flow of combustion and ventilation air.
2. A 3/4" NPT line is provided at the rear for the connection. Each boiler is equipped with
an internal pressure regulator which is set at 3.5" W.C. manifold pressure for natural
gas or 10.5" W.C. for LP gas. Use the 1/8" pipe tap on the burner manifold for
checking pressure.
An adequate gas supply is necessary. Undersized or low pressure lines will restrict the volume
of gas required for satisfactory performance. A steady supply pressure, between 7" 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 than 25% on natural gas, and 10% on propane gas, will
create pilot problems and affect burner operating characteristics. Contact your gas company
for correct supply line sizes.
Purge the supply line to clean out any dust, dirt, or foreign matter before connecting the line to
the unit.
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.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
3.0 INSTALLATION INSTRUCTIONS (Continued)
Codes require that a gas shut-off valve be installed in the gas line prior to the steamer. Make
sure the pipes are clean and free of obstructions, dirt, and piping compound.
WARNING: Prior to start-up, check all joints in the gas supply line
for leaks. Use soap and water solution. Do not use an open flame.
ELECTRICAL CONNECTIONS
WARNING: Electrical and grounding connections must comply with
the applicable portions of the National Electrical Code and/or other
local codes.
120 VAC-60 Hz - Single Phase
Make electrical connection to terminal block in rear of unit. A separate 15 amp supply is
needed for each unit.
Refer to the electrical diagram located inside cabinet on door.
NOTICE: If applicable, the vent line 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/NFPA
54, or the Natural Gas and Propane Installation Code CSA B149.1, as
applicable.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
4.0 OPERATION INSTRUCTIONS
WARNING: Do not force the gas control knob. Use only your hand
to turn the gas control knob. Never use any tool. If the gas control
knob will not operate by hand the gas control should be replaced by
a qualified service technician.
WARNING: Do not disassemble the gas control; it contains no
replaceable components. Attempted disassembly or repair may
damage the gas control.
WARNING: In the event of main burner ignition failure, a 5 minute
purge period must be observed prior to re-establishing ignition
source.
For CSD-1 equipped boilers, see section 4.0 for Operation Instructions for CSD-1 Equipped Boiler.
BOILER CONTROLS (Inside Cabinet)
Main Power Switch - ON fills the boiler tank and turns the boiler controls on. You should
allow 20 minutes to fill the tank and generate steam.
- OFF shuts off the boiler controls and opens the automatic
blowdown valve, emptying the boiler tank and releasing water and
steam to the drain. This should be done at least once daily to
remove sediment, lime, or scale.
Pilot Light - Indicates main power is ON.
Boiler Pressure Gauge - Should read 9 -11 psi during operation; 0 psi during shutdown.
Water Level Sight Glass - Observe level of water in the boiler and water quality. Murkiness in
the water indicates inadequate water quality; the owner must supply
proper water to the boiler (See page 4, Water Quality Statement).
Water Level Control - While ON, briefly open the water level control daily to remove any
sediment that might accumulate.
Safety Valve - This valve will release (pop off) if the boiler has too much pressure.
Once a week, this valve should be tripped during operation to make
sure it functions properly.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
BOILER CONTROLS (Inside Cabinet) (Continued)
CAUTION: If you smell gas during the lighting procedure,
immediately shut off the gas supply until the leak has been
corrected.
1. START-UP - BOILER OPERATION WITH STANDING PILOT IGNITION
Open manual gas shut off supply valve and if the appliance has a manual blowdown valve,
close it. Open cabinet door and turn ON power switch located on left side. Green pilot light will
come on, water will begin to enter boiler and required water level will be reached in about three
minutes. Observe water gauge glass to verify.
The dial on the combination gas control valve has three positions (ON-PILOT-OFF) for manual
gas control of main burners and pilot. Turn DIAL to PILOT. Depress dial and light burner
located on centre main burner of boiler. Maintain dial in depressed position for about 30
seconds and release. Observe that the pilot burner flame stays on. If at any time the flame
should become extinguished, a 5 minute period of complete shut off of gas supply is required
before relighting.
Turn dial to ON and burners should ignite. Steam generation will now commence and be
completed in approximately 15 minutes. Steam generation should reach approximately 11 psi
as indicated on the pressure gauge on the boiler.
2. START UP - BOILER OPERATION WITH ELECTRONIC IGNITION
Open manual gas supply valve.
Open cabinet door and turn main power switch ON. Green pilot light will come on, water will
begin to enter boiler and required water level will be reached in about three minutes. Observe
water gauge sight glass to verify.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
5.0 OPERATION INSTRUCTIONS FOR BOILERS WITH CSD-1 CONTROLS
WARNING: In the event of main burner ignition failure, a 5 minute
purge period must be observed prior to re-establishing ignition
source.
INITIAL START-UP PROCEDURE
1. Open the manual gas shut-off supply valve.
2. Close the manual blowdown valve, if so equipped.
3. Light the pilot burner.
The dial on the gas combination valve has three positions (ON - OFF - PILOT) for manual
gas control of main burners and pilot burner. Turn the dial on the gas combination valve to
“PILOT”, depress the dial and light the pilot burner on the centre burner. Maintain the dial in
depressed position for about 30 seconds and release. Observe the pilot flame stays ON.
Turn dial to “ON”.
If at any time the flame should become extinguished, a five (5) minute purging is
required before relighting is attempted.
4. Open cabinet door and turn “ON” the power switch.
The green pilot light will come “ON”. Water should begin to enter the boiler. When enough
water has entered the boiler the (amber) “STANDBY” pilot light will come on.
5. Press the “RESET” switch to begin boiler operation.
The “STANDBY” pilot light will go off and the boiler will begin operation.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
5.0 OPERATION INSTRUCTION FOR BOILERS WITH CSD-1 CONTROLS (Continued)
Daily Startup Procedure
1. Close the manual blowdown valve, if so equipped.
2. Examine that the pilot burner flame is burning. If the pilot burner is out, a five (5) minute
period of complete gas supply shut off is required before relighting.
3. Open cabinet door and turn “ON” the power switch.
The green pilot light will come “ON”. Water will begin to enter the boiler. When enough
water has entered the boiler the (amber) “STANDBY” pilot light will come on.
4. Press the “RESET” switch to begin the boiler operation. The “STANDBY” pilot light will go
off and the boiler will begin operation.
Daily Shutdown Procedure
1. Turn “OFF” the power switch. Observe that the burners go off.
2. Open the manual blowdown valve, if so equipped. If the appliance is equipped with an
automatic blowdown solenoid valve, the boiler’s contents, water and steam will be blown out
and exhausted through the appliance drain. The cold water solenoid valve will be activated.
Complete Shutdown Procedure
If the appliance is not intended to be operational for a lengthy period, then shut it down
completely.
1. Open the manual blowdown valve, if so equipped.
2. Shut off all supplies of power, gas and water to the appliance.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
5.0 OPERATION INSTRUCTION FOR BOILERS WITH CSD-1 CONTROLS (Continued)
Normal Boiler Operating Cycle
Water Fill Cycle
On the initial filling of the boiler, the reset switch must be activated to initialize the safety lockout
circuit. Once the water in the boiler has reached the proper level, the level control will open the
circuit to the fill solenoid valve, stopping the flow of water to the boiler. As the water is
consumed in the production of steam, the level control will close the circuit to the fill solenoid
and water will be supplied to the boiler.
Firing Cycle
The gas valve is operated by pressure sensing devices. On the initial operation of the boiler,
steam generation should reach 11 psi in approximately 15 minutes. At this point the “Operating
Pressure” switch will open, closing the gas valve. When pressure drops to 9 psi, the pressure
switch closes, the gas valve will open and ignition should occur.
Should the pressure rise more than 14.5 psi the “Override Pressure Switch” will close the circuit
to the override solenoid valve, releasing excess steam.
Condensing Drain
A thermostat is located in the drain assembly and is activated by the temperature of steam.
The thermostat opens the cooling solenoid valve, in turn supplying water to the drain to
condense steam.
Automatic Blowdown Valve
If the unit has an automatic blowdown valve, it is activated by the main power switch. The
boiler will be drained should the main power switch be turned “OFF”.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
5.0 OPERATION INSTRUCTION FOR BOILERS WITH CSD-1 CONTROLS (Continued)
SAFETY LOCKOUT CONDITIONS
High Temperature Condition
A high temperature safety device is installed on the boiler. Should the temperature exceed the
limit of this device, the boiler will be shut down and put in a state of lockout. The “Temperature”
pilot light (red), and the “Standby” pilot (amber), will come on.
High Pressure Condition
A high pressure safety switch is installed on the boiler. Should the pressure exceed the limit of
this device, the boiler will be shut down and put into a state of lockout. The “Pressure” pilot light
(red), and the standby pilot light (amber), will come on. Should this device fail to operate, the
safety relief valve will open.
Low Water Condition
A second low water safety cut off is supplied with the boiler. Should the water level fall below
normal operating levels, this device will shut down and put the boiler in a state of lockout. The
“Low Water” pilot light (red), and the “Standby” pilot light (amber) will come on.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
6.0 OPERATION INSTRUCTIONS - 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 cooker must be completed once daily prior to operation. (See
instruction plate or previous section in this manual for boiler start up procedures).
If appliance is equipped with optional - “Load Compensating Timer” a pre-heat thermostat is
installed in each compartment. This allows the compartment to pre-heat to 185EF before the
cooking time starts. Set timer for one minute. Ready light will go out and cook light will come
on; steam will enter compartment. Once compartment has reached the pre-heat temperature
(185EF) the timer will start. After the time selected has elapsed, buzzer will sound indicating the
end of the cooking cycle. Steam generation will cease, Cook light will go out and Ready light
will come on. To silence buzzer turn timer to its off position.
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.
Close compartment doors and set timer to “1 minute”.
1. When buzzer sounds, set timer to the “OFF” position.
2. Steamer is now ready for cooking.
3. With cooking compartment preheated and ready pilot light on, place pans of food to be
cooked into compartment and shut door.
4. Set timer to cooking time desired. Cooking cycle may be interrupted at any time by opening
door and resumed again by closing door.
5. 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.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
6.0 OPERATION INSTRUCTIONS - COOKER SECTION (Continued)
CAUTION: An obstructed drain can cause personal injury or
property damage.
Frequently check that the compartment drain and plumbing are 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.
IMPORTANT: 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.
SHUTDOWN
a) To shut down cooking compartment, set timers to their OFF position and leave doors
slightly open.
b) At the end of the day, the steam supply must be shut off. Details are on boiler instruction
plate or previous section of this manual.
WARNING: Never spray water into electric controls.
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.
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INSTALLATION AND OPERATION MANUAL,
GAS CABINET BASE CONVECTION STEAMER, GCX-16, GCX-24
7.0 PERIODIC MAINTENANCE
WARNING: Disconnect the unit from the power supply before
cleaning or servicing appliance.
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.
CAUTION: Protect yourself. When flushing control, hot water and
steam will flow out of the drain.
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.
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