Vulcan Materials VSX24E, VSX36G, VSX36R, VSX24G, VSX42GT User Manual

...

SERVICE MANUAL

VSX BOILER BASE SERIES

CONVECTION STEAMERS

(GAS, ELECTRIC, DIRECT AND REGENERATED)

VSX24G ML-52163 VSX24D ML-52827 VSX36G ML-52360 VSX36D ML-52830 VSX42GT ML-52376 VSX42DT ML-52834 VSX24E ML-52164 VSX36R ML-52831 VSX36E ML-52829 VSX42RT ML-52835 VSX42ET ML-52833

VSX24G SHOWN

This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qu alif ied. If yo u have attend ed a Vulcan Service School for this product, you may be qualified to perform all the procedures described in this man ual.

Thi s manu al i s no t i nten ded to be al l en comp assi ng . I f you have not atte nded a Vulca n Servic e School f or this produc t, you should read, in its entirety, the repair procedure you wish to perform to determine if you have the necessary tools, instruments and skills required to perform the procedure. Procedures for which you do not have th e n ecessary too ls, in strument s and skills should be performed b y a trained Vu lcan Service Technician.

Reproduction or other use of this Manual, without the express written consent of Vulcan, is prohibited.

- NOTICE -

A product of VULCAN-HART LO UISVILLE, KY 40201-0696 Form 24627 ( 12/98)

VSX SERIES STEAMERS

TABLE OF CONTENTS

GENERAL............................................................................. 4

Introduction ........................................................................ 4

Compartment Pan Capacity ........................................................ 4

Model Designations .............................................................. 4

Specifications ...................................................................... 5

Gas Steamers .................................................................. 5

Electric Steamers................................................................ 5

Steam Supply ................................................................... 5

Water Supply ................................................................... 6

Tools ............................................................................. 6

Water Conditi oning .................................................................. 6

STEAMER OPERATION.................................................................. 7

Cabinet Base Boilers ................................................................. 7

Gas Powered Steam Boiler ........................................................ 7

Electrically Powered Steam Boiler ................................................... 8

Direct Steam Powered Cooker ...................................................... 8

Regenerated Steam Powered Boiler .................................................. 8

Boiler Blowdown and Steamer Shut off ................................................... 8

Cooking Compartment Controls......................................................... 9

COMPONENT FUNCTION AND LO CA TION ................................................. 10

Cabinet Base Boiler Controls .......................................................... 10

Cooking Compartment Controls........................................................ 14

SERVICE PRO CE DURE S ................................................................ 15

Cabinet Bases ..................................................................... 15

Boiler ........................................................................ 15

Descaler...................................................................... 16

Water Level Controls

(Low Level Cut-Off and Different ial) ............................................. 16

Water Level Gauge Assembly ..................................................... 17

Pressure Switches (Gas and Electric Models) .......................................... 17

High Limit Thermostat ........................................................... 18

Removing The Boiler Assembly .................................................... 18

Fill and Cold W ater Solenoid Valv es ................................................ 18

Water Not Being Supplied to Boiler ................................................. 19

Blowdown Solenoid Valve Does Not Drain ............................................ 19

Steamer A chieves Pressure Slower Than Normal ...................................... 20

Inlet Water Strainer ............................................................. 21

Gas Models ................................................................... 21

Pilot , Thermoc ouple or Main Burner s ............................................ 21

Automatic Ignition Systems.................................................... 22

Gas Combination Control Valve Replacement ..................................... 23

Manifold Pressure Adjustment ................................................. 23

Electric Models ................................................................. 24

Magnetic Cont actor .......................................................... 24

Heating Element............................................................ 24

Direct Steam Models ............................................................ 26

Regenerated Steam Models (Steam Coil) ............................................. 26

COOKING COMPARTMENT.......................................................... 26

Controls ...................................................................... 26

Steam Supply Solenoid .......................................................... 26

Water Accumulating in Compartment................................................ 27

Cooking Cycl e Cannot Be Activated ................................................. 27

Intake Shut-Off Valve Adjustment (Steam Flow)........................................ 27

Door......................................................................... 27

Page 2 of 80

VSX SERIES STEAMERS

ELECTRICAL OPERATION .............................................................. 30

Water Level Controls................................................................ 30

Solid State -

Low level Cut-Off & Differential Control .......................................... 30

Electro Mechanical - Low level Cut-Off & Differential Contr ol .............................. 32

Sequence of O per ation .............................................................. 34

Gas Models ................................................................... 34

Electric Models ................................................................. 37

Schematics, Gas Steamers, Boiler Controls

VSX24G, 36G and 42GT ......................................................... 41

Manual Igni tion, St andar d Controls .............................................. 41

Electronic Ignition, Standar d Controls ............................................ 42

Manual Igni tion, CSD-1 Code Cont r ols ........................................... 43

Electronic Ignit ion, CSD-1 Code Controls ......................................... 44

Wiring Diagrams, Gas Steamers, Boil er Controls

VSX24G, 36G AND 42GT ........................................................ 46

Manual Igni tion, St andar d Controls .............................................. 46

Electronic Ignition, Standar d Controls ............................................ 48

Manual Igni tion, CSD-1 Code Cont r ols ........................................... 50

Electronic Ignit ion, CSD-1 Code Controls ......................................... 52

Schematics, Electric Steamers, Boiler Controls

VSX24E, 36E AND 42ET ......................................................... 54

Auto Blowdown, Standard Controls .............................................. 54

Auto Blowdown, Cal-Code Controls .............................................. 55

Auto Blowdown, Standard Controls .............................................. 56

Auto Blowdown, Cal-Code Controls .............................................. 57

Wiring Diagrams, Elec tric Steamers, Boiler Controls

VSX24E, 36E AND 42ET ......................................................... 58

Auto Blowdown, Standard Controls .............................................. 58

Auto Blowdown, Cal-Code Controls .............................................. 60

Auto Blowdown, Standard Controls .............................................. 62

Auto Blowdown, Step Down Transformer, S tandard Controls .......................... 64

Auto Blowdown, Step Down Transformer, Cal-Code Controls (2 contactors) ............... 66

Auto Blowdown, Step Down Transformer, Cal-Code Controls (4 contactors) ............... 68

Wiring Diagr ams, Electric Heater Circuits

VSX24E, 36E AND 42ET ......................................................... 70

Schematic, Direct Steamers, Cabinet Base

VSX24D, 36D and 42DT .......................................................... 73

Wiring Diagram, Direct Steamers, Cabinet Base

VSX24D, 36D and 42DT .......................................................... 73

Wiring Diagrams, Regenerated Steamers, Boi ler Controls

VSX36R and 42RT (Older Models) .................................................. 74

Schematic All Models - Compart ment Controls ............................................ 76

Wiring Diagram, All Models - Compartment Controls ........................................ 77

TROUBLESHOOTING .................................................................. 78

Page 3 of 80

VSX SERIES STEAMERS - GENERAL

GENERAL

INTRODUCTION

General

This manual is applic able for all models listed on the cover page. A conv ection steam er on a 42 inch base with a til ting kettle is pictur ed below for reference.

VSX42RT SHOWN

Steam Cooking

Pressure-less steamers offer an ef ficient way to produce many foods in smal l portions or l ar ger batches. Pressure-less, convecti on steam cooking will steam cook fresh foods or will steam defrost and cook froz en foods providing the maxi mum color, flavor and nutr itional value with the least expendit ur e of energy and l abor . The pressure-less steaming compartment allows the operator to open and close the door, anyti me during a cooking cycle. The steam supply will shut off when the door is opened, then re-start when the door is closed.

Compartment P an Capacity

NUMBER OF

PANS PER

COMPARTMENT

24.0

DEPTH

(INCHES)

Boiler Code Descriptio ns

Vulcan-Hart incorporates redundant c ontrols in compliance with California Code (Cal-Code) and CSD-1 as an option on steam equipment when required by stat e and/or local building code requirements. Descriptions of the codes are listed below.

Cal-Code Construct ion electrical safety circuits that, i f tri pped, must manually be reset after the condit ion causing the trip subsides. These controls consist of - (1) dual function water level cycling and low level cut off control and ( 1) si ngle funct ion low water level cut- off control ( A ux - LLCO) and a hi gh pr essure rel ief switch in conj unc tion with a m ec hanical pressure relief valve.

CSD-1 Constructi on electrical safety circuits that, i f tri pped, must manually be reset after the condit ion causing the trip subsides. These controls consist of - (1) dual function water level cycling and low level cut off control and ( 1) si ngle funct ion low water level cut-off control ( LLCO) and a high pressure reli ef switch in conjunction with a mechanical pressure relief valve. Additi onally, both circui ts have individual indicator lights that will illum inate for a visual verification of the shutdown mode.

Cal-Code and CSD-1 constr uc tion both requi r e operator intervention in the event of a shutdown. CSD-1 is mor e informative by using indicator lights to show which safety system was shutdown.

Model Desi gnations

S X XX X X

- Redundant controls in the

T - Tilting kettle (24 qt.) found on 42" wide cabinet base onl y .

Heating System: G - Gas

E - Electric D - Direct R - Regenerated

Cabinet Base Width ( inches) Pressure-less Steamer Vulcan

32.5

61.0

Pan Size 12" x 20"

Page 4 of 80

Gas Steamers

VSX SERIES STEAMERS - GENERAL

SPECIFICATIONS

INPUT

(BTU/HR)

MODEL NAT. PROP. NAT. PROP. RECOMMEND MIN RECOMMEND MIN

VSX24G 200,000 200,000 4.0 10.0 7.0 5.0 11.0 11.0

VSX36G

VSX42GT

200,000 200,000 4.0 10.0 7.0 5.0 11.0 11.0 240,000 240,000 4.0 10.0 7.0 5.0 11.0 11.0 200,000 200,000 4.0 10.0 7.0 5.0 11.0 11.0 240,000 240,000 4.0 10.0 7.0 5.0 11.0 11.0

MANIFOLD

PRESSURE

(INCHES W.C.)

NATURAL PROPANE

LINE PRESSURE

(INCHES W.C.)

Electric Steamers

AMPERAGE

1 PHASE 3 PHASE 3 PHASE - 4 WIRE

MODEL

VSX24E 24* 116 100 67 58 29 34

VSX36E

VSX42ET

*std

TOTAL

208V 240V 208V 240V 480V 220/380V & 240/415V

24* 67 58 29 34 36 100 87 44 50 42 117 48 116 58 67 24* 67 58 29 34 36 100 87 44 50

MAX

14.0

LOAD (WATTS)

360 3.0

AMPS (MAX)

120V 60HZ

Steam Supply

Dry steam must be prov ided to the steam er . If t he steam is heavy with condensate, a Ball Fl oat Trap must be used in the line and plumbed in before the pr essure reducing valve. To ensure rapid heat up of heavy c old loads, the steam supply line must be si z ed to maint ain pressure as outlined bel ow.

DIRECT STEAM

STEAMERS (POTABLE)

Supply Pressure 15 psi (max.) 15 psi (max.)

Flow Rate 100 lb. per hour total

Pre ssure Reducing

Valve Output

*Potable stea m is no t required for regenerated models but could be used.

(min.)

10 psi (furnished) set accordingly for good

REGENERA TED STEAM

STEAMERS

(*NON-POTABLE)

125 lb. per hour total

(min.)

steam gene ration but no higher than 15 psi. (furnished)

Page 5 of 80

VSX SERIES STEAMERS - OPERATION

Water Supply

Supply pressure should be 20-80 psig In line strainer f or suppl y line (Not Supplied) Supply connection cold Total dissolved solids (TDS)* less than 60 ppm Total alkalinity less than 20 ppm Silica less than 13 ppm Chloride less than 30 ppm PH fact or 7 to 8

(*17.1 ppm = 1 grain of har dness)

TOOLS

Standard

Standard set of hand tools.



Volt-Ohm-Meter (VOM) with AC current tester.



(Any quality VOM wit h a sensit ivity of at least

20,000 ohms per volt c an be used)

Gas leak checking equipment.



Gas Pressure Manometer



Special

CLR Treatm ent Kit - Used to remov e



Calcium/Lime/Rust fr om a boiler ( Contact

Vulcan Authorized Service Cent er s ).

Adaptor to test thermocouple closed circuit



voltages (DC) on gas models with manual

ignition (purchase locally).

NOTE:

An exam ple of one adaptor type is pict ur ed

below.

Adaptors v ary between manuf ac turers.

WATER CONDITIONING

Furnishing the boiler wit h soft water to reduce scale formation is important. Scale formation will reduce steam output, cause premature c omponent f ailure, and shorten equipm ent life. Most water supplies contain scal e pr oduc ing miner als such as Calcium and Magnesium. A s steam is generated, the minerals remain and dissolve into the water. As the concentration of these minerals inc r eases past a certain point, they pr ec ipitate from the water and coat the inside of the boiler, heating elements, thermostat bulbs and water level probes. Because of the high temperature of these surfaces, the precipitated minerals bake onto them and become very difficult to remove.

This causes several problems:

1. Reduce the heat transfer efficiency of the heating system .

2. Cause premature failure of E lectric heaters.

3. Water l evel pr obes will give false readings.

4. Thermostat bulbs will sense temperature incorrectly.

These problem s are common to any manufacturer's steamer regardless of design, but t hey c an all be prevented by furnishing the boiler with soft water. Vulcan recommends the water cont ain less than 60ppm of “ total dissolved soli ds” (TDS) and hav e a PH fact or between 7 to 8. These water properties can be achieved by using a properly maintained water softener.

Other chemical pr oper ties in water supplies can also affect good steam generation and vary fr om within each state and locality.

The water level probes in the boiler use ions i n the water to detect the water level. demineralized or de-ionized water since it is "non conductive" and the water level can not be detect ed.

Do not use

fully

NOTE:

remove mi nerals from the water. Vulcan recommends that a local water treatment

specialist be consulted before t he installat ion of any steam generating equipment.

Steamers that operate over a long peri od of time without the benefit of a water softener, which have developed a heavy scale build up, should be cleaned bef or e using a water softener.

Page 6 of 80

The use of strainers, or filters will not

VSX SERIES STEAMERS - OPERATION

STEAMER OPERATION

WARNING:

SERVICING THE STEAMER. THE COOKING COMPARTMENT CONTAINS LIVE STEAM. STAY CLEAR WHEN OPENING EACH DOOR.

Ensure that all utility connections to the steamer have been made and are turned on.

On model s that are Cal-Code/CS D- 1 equipped, amber col ored lights for Hi pressure and low water level will illuminate and stay on until the boiler is full and the manual reset switch pressed.

Gas Powered Steam Boiler

1. Open the cabinet door and turn main power

THE STEAMER AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, CLEANING OR

On Models with Automatic Ignition

CABINET BASE BOILERS

switch ON. The red light will illuminate, water will begin filling the boiler and the blowdown solenoid valve will close. The boiler should fill, in four to eleven minut es. Observe water l evel gauge glass to verify that water is in boi ler and that the l evel in the gauge glass is about hal f full. Both valves on gauge glass assembly m ust be open to fill the gauge. Older models equipped with a manual “ball” type blowdown valve must be closed for the boiler to fill. The cycling pressure switch will maintain the proper steam pressure in the boiler by cyc ling the heating system on and off to generate steam pressure.

On Models with Manual Ignition

knob on the gas combination contr ol valve has three positions (O n- P ilot-O ff) for control of main burners and pilot. Turn knob on gas combination valve to PILOT then depress and light pilot burner with a lit taper. Maintain knob in depressed position for about 30 seconds and release. Observe that pilot burner flame stays on. If the flame should go out, wai t 5 minut es before relighti ng.

- The

The knob on the gas com bination cont r ol valve has two positions (On-Off) for control of main burners and pilot. For the automatic ignition system t o work, the knob must be set i n the ON position or gas for the pilot and main burners will not flow. Also, the ignition c ontrol module ON/OFF/RESET switch must be in the ON position to operate. Thi s switch is located on the upper left side of the electrical control box for the ignition control module. A red light will illuminate when the switch is in the ON posi tion. DO NO T ATTEMPT TO MANUALLY LIGHT THE PILOT IN AN AUTOMATIC TYPE IGNITION SYST EM.

After the main power switch is turned ON and the ignition control modules RESET switch is in the ON position, sparking will begin three seconds lat er to light the standing pilot. If the pilot light s, a si gnal is sent back through the igniti on c able indicat ing the presence of pilot flame and sparking stops. If the water level i n the boiler has reached the minimum level, the burners will ignite and begin to heat t he water in the boi ler. After approximately 15 minut es, st eam should be present f or cooking product. Observe that the boi ler pressure gauge indicates steam pressure of 8-10 psi. If a pilot flame i s not established immedi ately, sparki ng will continue for 90 seconds. After that duration, the ignition control module will lock out and needs to be r eset to start the pilot and burner lighting cycle again.

Turn knob on gas combination cont r ol valv e to ON. If the water level in the boiler has reached the minimum level, burners will ignite and begin to heat the water in the boiler . After approximately 15 minutes, steam should be present for cooking product. Observe that the boiler pressure gauge indicat es steam pressure of 8-10 psi.

Page 7 of 80

VSX SERIES STEAMERS - OPERATION

Electrically Powered Steam Boiler

Open the cabinet door and turn m ain power switch ON. The red light will illuminate, water will begin filling the boiler and the blowdown solenoid val ve will close. The boiler should fill, in 4 to11 minutes. Observe water level gauge glass to v er ify t hat water is in boiler and that the level in the gauge gl ass is about half full. Both valves on gauge glass assembly m ust be open to fill the gauge. Older models equipped wi th a manual “ball” type blowdown valve must be closed for the boiler to fill. If t he water level in the boiler has reached the minimum level, the magnetic cont ac tors will close, the heaters will energize and begin to heat the water in the boiler. After approx imately 15 minutes, steam should be present for c ook ing product. O bserve that the boiler pressure gauge indicates steam pr essure of 11-13 psi.

Direct Steam Powered Cooker

1. Open the cabinet door and turn main power switch ON.

A. The red light on the switch will illuminate. B. If steam pr essure is above the m inimum

setting on the cooking compar tment pressure switch then the switch will close, ready light will come ON and power to the other controls will be supplied.

C. Observe that the steam pressure gauge in

the cabinet base, indicates 10-12 psi.

2. Steamer is ready t o c ook pr oduc t.

Regenerated Steam Powered Boiler

BOILER BLOWDOWN AND

STEAMER SHUT OF F

Turn the steamer off at least once daily and blow down the boiler t o r emov e sedi ments, scalants and lime build-up in the boil er . Always blowdown the boiler when it is under maximum pressure and no steam is bei ng used.

Automatic blowdown.

A. Newer Models

and turn main power switch OFF. The switches’ red light will go out, the blowdown/drain solenoid valve will be deenergized and the boiler will begin to drain. The cold water condenser solenoid will continue to operat e, as needed, to condense steam and to cool the water going into the drain.

B. Older Models

and depress blowdown timer butt on. Blowdown timer will operate for 4 minutes. At the end of blowdown, turn fill switch to ON and allow boi ler to f ill.

Manual blowdown.

A. All Models

blowdown valve loc ated on the bottom front of the cabi net base. After the boiler has completely drained, c lose blowdown valve and t ur n fill switch to ON and allow boiler to fill.

- Open the cabi net door

- Turn power switch OFF

- Turn power switch OFF. Open

1. Open the cabinet door and turn main power switch ON. The pilot light will illuminate, water will begin filling the boiler and the blowdown solenoid valve will close. Models equipped with a manual “ball type” blowdown valve need to be closed for the boiler to f ill. The boiler should fill, in approximately 15 minutes. Observe water level gauge glass to verify that water i s i n boiler and t hat the level i n the gauge glass is about half full.

Both valves on the gauge glass assembly must be open to fill the gauge. When the water reaches the minimum level, the steam solenoid valve will open, allowing steam to enter the steam coil in the heat exchanger tank and begin heating the water. Af ter approxi mately 20 minut es, a sufficient amount of pressuriz ed steam should be present for cooking pr oduc t.

Page 8 of 80

VSX SERIES STEAMERS - OPERATION

COOKING COMPARTMENT

CONTROLS

When the steam pressure in the c ook ing compartment manifold reaches approximately 3 psi , the cooking compartment pressure switch closes, suppling power to the ot her c ontrols. The ready lights will illuminate and after approximately one minute, the steam pressure in the boiler will reach the upper li mit of 10 psi. If the pressure drops below approximately 3 psi , the pressure switch will open, removing power f r om the cooki ng c ompartm ent controls.

NOTE:

the ready light comes on, a loud clanki ng sound wil l be heard (oil c anning) and the ready l ights will flash for several seconds. This condition is caused by the manifold pressure being on t he “fringe” of the pressure switch set point. When a cook t imer i s set, the compartment steam solenoid valve opens causing the manifold steam pressure to drop, slightly below the pressure switch set point. At the same time, steam pressure is still increasing in the boiler. This opposing condit ion causes a pressure “bounce” to occur but after the steam pressure passes approximat ely 4 psi this condition subsides. Under normal steam cycling pressures, this conditi on will not be seen.

If a cook ing timer is set immediat ely aft er

5. When timer knobs reach "0", buz z ers will sound, steam generation will cease, cooking lights will go off and ready lights will come on. To silence buz z er s, turn timer knobs to off position.

6. During a cooking cycle, the heat ing system will cycle on and off as necessary to maintain steam pressure in the boiler.

NOTE:

occur due to the r egulated constant steam supplied from the building. Steam will come on for cooking when a cook tim er is set and go off at the end of that time.

7. Turn power switch off t o r emov e power from

8. Blowdown boiler. See “BOILER BLOWDOWN

On direct st eam units, no steam cycling will

the steamer and the red light will go out.

AND STEAMER SHUT-OFF” under “STEAMER OPERATION”.

1. With both tim er knobs at the off position, open the compartment doors and observe that no steam has entered the c ook ing compart ments, then close the doors.

2. Set both tim er knobs at 2 minut es. The ready lights will go off, the cooking lights will come on, and steam will begin to enter the compartments.

3. After one minute, open each door and observe that steam has ceased to enter each compartment, cook ing light s go back to ready, and one minut e is remaining on each cook timer.

4. Close doors and steam generation and cook timing will resume. Observe the floor drain to ensure that live steam from compart ments is being cooled by cold water fr om the cold water condenser solenoid valve.

Page 9 of 80

VSX SERIES ST E A M E RS - COMPONENT FUNCTION AND LOCATION

COMPONENT FUNCTION AND LOCATION

CABINET BASE BOILER

CONTROLS

WARNING

HOT. USE CARE WHEN OPERATING, CLEANING OR SERVICING THE STEAMER. THE COOKING COMPARTMENTS CONTAIN LIVE STEAM. STAY CLEAR WHEN OPENING EACH DOOR.

Water Level Gauge Assembly

confi r mation that water level is bei ng maintained in the boiler during operati on. The correct water level is a point one-half of the height of the glass. The manual valves at the top and bottom of this assembly m ust be full y open and only closed if the glass tube is damaged.

Observe that the water is clean and clear in the glass tube. The appearance of ext r eme murkiness in the water i ndicates inadequate water quality and will cause failure of controls and the steamer. War ranty does not cover mal functi on due to poor water conditions. Blowdown and/or clean out t he boiler as outlined in “BOILER BLOWDOWN AND STEAMER SHUT-OFF” under “STEAMER OPERATION” and “BOILER” under “SERVICE PROCEDURES”.

Water Level Control and Level Sensing Probes

these controls al low water to enter the boiler to f ill and maint ain the proper water l evel. They will also shut off the heat source to the boiler i f the water level drops too low.

The water level cont r ol works by using three different probe lengths to monitor the water level. The probes consist of a high level (HL), low level (LL) and low water cut-off (LLCO). The level sensing probes may easil y be r emov ed to inspect f or lime build up. A s a rule, the condi tion of these devic es will indicate the overall water condition of t he boiler. Clean the probes if needed.

NOTE:

clogging will occur if a daily blowdown procedure is not followed.

Boiler Fill Solenoid Valve

boiler when dem anded by the water level control to maintain the correct water level in the boiler.

Cold Water Condenser Solenoid Valve

cold water flow into the boiler blowdown drain box to condense steam and cool the hot water before its discharge int o the drain.

: THE STEAMER AND ITS PARTS ARE

- permits visual

Controls m ay not function and serious

- admits water to the

- allows

Cycling P ressure Switch

between prescribed limit s by t ur ning the heat source on and off.

High Limit Pressure Sw itch

design to the cyc ling pressure switch but used as a high li mit. The pressure settings are at hi gher and lower limits than the cycli ng pressure switch in order to turn off the heat sourc e before the boi ler pressure reaches its limit and automati c ally resets af ter the pressure drops below the lower limit set point.

Blowdown/Drain Solenoid Valve

plumbed into the drai n pipe of the boiler. Newer steamer models will automatically blowdown when power is turned off by using a normally open solenoid valve. Older models can have a solenoid valve t hat is activated by depr essing a separate blowdown timer button or have a manual “ball” type valve. Daily boiler blowdown is essential to proper operation and component life by removing sediment and scalants that may be lodged in the chamber of the boiler .

Strainers

to prevent foreign matt er from becoming lodged in the fill or cold water condenser solenoid valves and to keep unwanted parti c les out of the system. A "Y" strainer should be inserted upstream of the fill solenoid valve.

On model s using a direct steam suppl y , a strainer i s used in the pressure regulating valve.

Power Switch

to the controls and the steam generat ing process is started in the boiler. The power switch is located on the front of the boiler contr ol box.

Water Inlet Valve

stop water fl ow to t he steamer when the steamer is being serv iced. Newer models will have a sm all Petcock type val ve whil e older model s will be a “ball” type valve. This valve should remain open during normal operati on.

High Limit Thermostat

shuts off the heat source if the boil er temperature exceeds a specified limit . All standard models are equipped with a surface high limit .

Descaler

boiler and is used to help control boiler surf ac e scaling. Two descalers are used in each boiler.

Handhole Cover Assembly

removed, allows internal ex amination and cleaning of boiler shell and its components if required.

- a strainer is used in the water inlet line

- when turned ON, power is suppli ed

- the water inlet v alve is used to

- hangs submerged in water i nsi de the

- control s boi ler pressure

- a switch of identical

- this valve is

- a protective device that

- when unbolted and

Page 10 of 80

VSX SERIES ST E A M E RS - COMPONENT FUNCTION AND LOCATION

Pressure Gaug e

- indicates boiler steam pressure.

Normal operating pressures are listed below.

STEAMER

TYPE

Gas 8 -10 Electric 11 - 13 Direct 10 - 12 Regenerated 10 - 12

- drains steam c ondensate and water from

Drain

PSI

cooking compartments and boiler.

Check Valve

- On models with the deli me piping assembly option, prevents the ejection of hot water and steam out of the deli me funnel if the manual delime fill valve were to be opened.

Delime Port Assembl y

- On models with the deli me piping assembly option, allows the boiler and other internal components to easily be delimed to remove calcium, lime and rust bui ld up. See ”BOILER” under “SERVICE P ROCEDURES”.

Standing Pilot (Gas Boilers)

- should always remain lit t o light the main burners upon a cal l for heat unless the steamer will not be in use for an extended period. If the pilot flame goes out, wait 5 minut es before relighting.

Main Burn ers ( Gas Boilers)

- heats the water in

the boiler to generate steam.

Combination Control Valve (Gas Boilers)

- a gas solenoid that opens t o allow gas flow when a call for heat is made and also regulates the m anifol d gas pressure.

Pressure Regul ating Valve (Direct & Regenerated Steam)

- regulates the manifold

steam pressure between 10-12 psi.

Magnetic Contactor (E lectric Boil ers)

- when coil is energized, suppl ies power to the electric heating elements.

Heating Elements (Electric Boilers)

- heats the

water in the boi ler to generate steam.

Page 11 of 80

VSX SERIES ST E A M E RS - COMPONENT FUNCTION AND LOCATION

Page 12 of 80

VSX SERIES ST E A M E RS - COMPONENT FUNCTION AND LOCATION

Page 13 of 80

VSX SERIES ST E A M E RS - COMPONENT FUNCTION AND LOCATION

COOKING COMPARTMENT

CONTROLS

WARNING:

HOT. USE CARE WHEN OPERATING, CLEANING OR SERVICING THE STEAMER. THE COOKING COMPARTMENT CONTAINS LIVE STEAM. STAY CLEAR WHEN OPENING EACH DOOR.

The upper section of the steam er c onsi sts of two separate cooking compartm ents. Each compartment functions independently with its own set of contr ols. Power is supplied to t he c ontrols only after the steam pressure rises above 3 psi to close the compartment pressure switch. The switc h remains closed as long as steam pressure stays above 3 psi but will open i f the pressure drops below that setting.

Ready Light (Green)

is ready to cook.

Cooking Light (Red)

is in a cooking cycle.

Cooking Timer

tim e between 0-60 minutes. When a timer i s set, the steam supply solenoid valve is energized to al low steam int o the cooking compartment but only after the boiler has reac hed its operating pressure. Also, energizes the buzzer when time expires.

THE STEAMER AND ITS PARTS ARE

- when lit, indicates steam er

- use to set desired cooking cycle

Steam Solenoid Valve

allow steam into the cooking compartment (normally closed v alve).

Compartment P r essure Switch

the control s only after the steam pressure rises above 2. 3 psi to close the compartment pr essure switch. The switch remains closed as long as steam pressure stays above 2.3 psi but will open if the pressure drops below that setting.

Manifold Pressure Gauge

of steam pressure in manifold. T he intake shut-off valve should be adjusted so manifold pressure remains at 9 psi with both compartments on.

Steam Supply Manifold

from the boiler for each cook ing compart ment. Supplies steam up to the steam sol enoid valve.

Intake Shut-Off Valve

from the boiler to the steam suppl y manifold. This valve should NOT be left fully OPEN to boiler steam supply. See “INTAKE SHUT-OFF VALVE ADJUSTMENT (STEAM FLOW) under “SERVICE PROCEDURES”.

- when energized, opens to

- supplies power to

- indicates the amount

- main st eam supply line

- main st eam supply shut-off

Buzzer

turned off manually.

Door Switch

timer.

- signals end of a cook cycl e, must be

- removes electr ical power to the

Page 14 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

SERVICE PROCEDURES

WARNING:

MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POI NT S ARE NOT EASI LY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST .

BOILER

Inspection

It is recommended that the boiler be thoroughly inspected f or excessive scale and li me build up on a quarterly basi s. In hard water areas or for units heavily used, a more frequent interval should be used. This inspection consists of an i nternal examination and cleaning of the boiler shel l, an examination and possibl e r eplacement of the descaler, a check of li me build up on the water level sensing probes, and a check of all boiler controls, including the pressure switches.

Periodic servi c e must be perfor med as outlined in these procedures. See “WATER CONDITIONING” under “GENERAL”.

WARNING

INSTRUCTI ONS ON THE CLR BO TTLE. USE PLASTIC OR RUBBER GLOVES TO AVOID SKIN CONTACT. IF CLR LIQUID COMES IN CONTA CT WIT H THE SKI N, RINSE WITH CLEAN W AT ER.

Clean-Out (All Boiler Models)

1. Turn steamer OFF and drain boiler.

2. Remove hand hol e plate and gasket (top front)

3. Remove ol d descaler retaining springs if

CERTAIN PROCEDURES IN THIS SECTION REQUIRES ELECTRICAL TEST OR

CABINET BASES

: READ AND FOLLOW THE

from the boiler by removing the nut and clamp, then tapping t he c over lightly to free i t while holding the c over stud. This prev ents the cover from dropping into boiler.

present.

NOTE:

to nine gallons for both gas and el ec tric m odels depending on the boiler size and BTU/KW rating.

NOTE:

contact wit h steamer components, lightly rinse of f with clean water.

Boiler water c apac ities vary between seven

If deliming solution acc idently comes in

A. Models with Blowdown Timer

deliming solution into boiler shell. Mix the solution in accordance with the instructions on its container. Proceed to step 9.

B. Models without Blowdown Timer

the incoming water supply. Turn the unit ON to close t he dr ain valve. Pour deliming solution into boiler shell. Mix the solution in accordance with the instruct ions on its container. Proceed to step 9.

C. Models with Del iming P ort Assembly

Before mixing and pouring del iming solution into boiler , clean the seati ng surfaces for the hand hole gasket and then install a new gasket. Position t he hand hole plate and tighten down. Turn off the incoming water supply. Tur n the unit ON to close the drain valve. Open the deliming assembly valve and pour the deliming solution into the port. Mix the solution in accordance with the instructions on its contai ner. Close the deliming assembly valve and proceed to step 10.

- Pour

- Turn off

4. With a wire brush, or equivalent, dislodge and

remove all loose scale from boiler shel l. The loose mater ial must be either scooped fr om the boiler or flushed through t he dr ain.

5. Check probe canister and f loat valve assembly

(regenerated models) for a scale build up and clean as necessary.

6. Check drain hole f or obstructions.

7. Install two new descalers.

8. Mix the deliming solution according to the

instructions for the chemical in use then add solution to boiler.

Page 15 of 80

9. Clean the seating surfac es for the hand hole gasket and then Instal l a new gasket. Position and tighten t he hand hole plate.

VSX SERIES ST E AMER - SERVICE PROCEDURES

10. Cooking c ompartm ent timers are to be in the OFF position. Turn the boiler switch ON and open water valve if necessary.

11. Boiler is to operate under pressure for 90 minut es or per the instructions for the chemical in use.

12. Drain boiler by normal methods. Refill boiler and allow heat until f ully pressurized.

13. Repeat step 12 thr ee times.

14. The steamer is now ready for nor mal operation.

Deliming Only (Models with Deli ming Port Assembly)

Boiler delim ing should be perfor med on a weekly, bi-weekly or monthly basi s, depending on the quali ty of the local water supply.

On steamers using a water purifi c ation system, follow the instructions for that system to deli me the boiler. Only use the type of chemical recommended or described in the instructions for deliming wit h this type of system.

1. Turn steamer OFF and drain boiler.

2. Mix the deliming solution according to the instructions for the chemical in use then add solution to boiler.

NOTE:

Boiler water c apac ities vary between seven to nine gallons for both gas and el ec tric m odels depending on the boiler size and BTU/KW rating.

NOTE:

If deliming solution acc idently comes in contact wit h steamer components, lightly rinse of f with clean water.

Models with Blowdown Timer

- Open the deliming assembl y valve and pour the deliming solution into the port. Mix the solution in accordance with the instructions on its contai ner. Close the deliming assembly valve and proceed to step 3.

Models without Blowdown Timer

- Turn off the incoming water supply. Turn the unit ON t o close the drain valve. Open the deliming assembly valve and pour the deliming solution into the port. Mix the solution in accordance with the instructions on its contai ner. Close the deliming assembly valve and proceed to step 3.

3. Top compartments are to be in the OFF position. Turn the boiler switch ON and open water valve if necessary.

4. Boiler is to operate under pressure for 90 minut es or per the instructions for the chemical in use.

5. Drain boiler by nor mal m ethods. Refill boiler and allow to heat up and build steam pr essure.

6. Repeat step 5 three times.

7. Unit is now ready for normal operation.

Descaler

The descaler i s accessible through the hand hole opening. It is a coiled wire wound around a solid cylindrical cor e, and hangs by an open loop from the shell's horiz ontal stay rod, about 4 inches from the front of the shell . If t he wi r e is eaten through, or if the core of the descaler is eaten away to half its original size, a new descaler should be i nstalled.

To install a new descaler, stretch its wire coil so that the descaler hangs with i ts core completely below the mi nimum water level in the boiler, but hanging free. The descaler must not contact the bottom of the boiler shell, elec tric heating element s or t he regenerating steam coil s on uni ts so equipped.

Water Level Cont rols (Low L evel Cut-Off and Different ial)

Solid State

1. Ensure that water is filling the boiler.

2. Check for correct voltage being applied to the board.

3. Verify the water level control boar d oper ation as outlined in “WATER LEVEL CONTROLS” under “ELECTRICAL OPERATION”.

A. Does the HL LED light up and the HL r elay

energize to change the contact stat e at power on?

B. As the boiler fills, does the LLCO LED light

up and the LLCO relay energize to change the contact state after the water level reaches the LLCO probe?

Page 16 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

C. Does the HL LED go out and the HL relay

de-energize, allowing the cont ac t state to switch back to i ts starting condition after the water level reaches the HL pr obe?

4. If water is in t he boiler but is not being detected by the water level probes, the probes may need cleaned and/or boiler delimed. See “BOILER”.

5. After checking the abov e items, if the water level control board does not appear to be functioning as outlined, then repl ac e the board.

6. Check unit for proper operation.

Electro Mech anical WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

Loose electri c al connections may prev ent the heat from coming on or may cause the boiler to overfill. Accumulation of boiler scale on or near the sensing probes may cause them to retain water on the insulator surface. This may prevent the boiler from filling or cause dry firing. Dry firing will result in damage to heating elements or to the boiler. Verify the water level cont r ols operation as outlined in “WATER LEVEL CONTROLS” under “ELECTRICAL OPERATION”.

With the individual probe l ead wir e r emov ed, check the probes and contactor s as outl ined below:

1. With an ohmmeter , check the probe bet ween

the wire connection and shell. An open c ircuit should be present when the boiler is empty. If resistance is present, r emov e and c lean the probes. Also check for a cracked insulator, then reinstall probes and check. When the boiler is full of water, a resistance reading should be measurable bet ween the probes and shell only.

NOTE:

Actual resistance reading will depend on

water qualit y and pr obe c ondition.

2. Check low level and dif ferenti al water level

controls. Wi th the power switch ON, use a voltmeter to check the i nput voltage across terminals 1 & 2. Meter shoul d r ead 115V . With the boiler empty, ac r oss terminals 9 & 10, y ou should read 300 to 350V. If you do not r ead this voltage, then coil is bad and contac tor should be replaced.

3. Remove sensing probe. First rem ove the

bolted cover over the sensor cluster. Then remove the wire from the pr obe and unscrew the probe with a wrench. Be c ar eful to note the locati on of each probe and the number of the wire connected to it. Incor r ec tly connected wires will cause the controls to malfunction.

4. Clean probe thoroughly, r emov ing ALL deposits from the insulat or . Do not use an abrasiv e on the insulator; use a soft cl oth.

5. Inspect through the probe socket for the presence of water. Water must drain from the probe housing. If in doubt, pour water into the housing and observe that it drains quickly. If the housing fails to drai n, remove the housing or housing cover and clean the interior mechanically.

Water Level Gauge Assembly

Close the valve at the top and at the bottom of the gauge assembly. Unscrew the packing nuts at the top and bottom of the glass tube. Slide the glass tube upwards, until the bottom of the tube is clear of the fitting and lift it out.

When r einstalling the tube, use new sealing washers. Do not over t ighten the packing nuts; it could break the gauge glass. Check that both top and bottom valves are f ully open.

Pressure Swit ches (Gas and E lectric Models) WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

Remove the boil er control box cov er to access the two controls. T he pr essure switch on the left is the cycling or prim ar y c ontrol; the one on the right i s the high li mit c ontrol. They ar e identical switches, differing only in their settings.

Turn the power ON and l et the boiler c ome up to pressure. Aft er the ready light comes ON, t ur n one of the cook ing compartment timers on to exhaust steam f rom the boi ler. Observe boiler pr essure gauge readings for sev eral cycles and compare them with the pressure settings in the chart. If the readings differ, adjust the pressure settings as described below.

Two slotted and square headed adjustment screws extend thr ough the top of t he swit c h c ase with dials and pointers to indicate the appr oxim ate setting. The adjustment screw directl y above the dial changes both the cut-out (off) and the cut-in (on) points. Set it first to give the proper off setting. Turning the scr ew cl oc k wise i ncreases the pressure. Then set the second adjustment screw to give the proper on setting. The pressure settings for eac h switch are li sted below.

PRESSURE SETTINGS (PSI)

CYCLING HIGH LI MIT

UNIT ON OFF ON OFF

Gas 8 10 6 15

Electric 11 13 6 15

Page 17 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

High Limit Thermostat WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

Remove thermostat (bi-metallic disk type) and inspect f lat surfac e of thermostat for c or r osi on or rust. Replace if rusted.

Clean thermostat mount ing and thermostat surfaces before remounting or r eplacing. A good metal -to-met al contact is essential for pr oper functioning of the thermostat. This service m ust be performed at least once a y ear .

On gas boilers, the high li mit t her mostat is loc ated on the face of the boiler close to t he si ght glass on the right side. For access, remove t he small metal cover placed ov er the therm ostat.

On electr ic boil er s, the high li mit t her mostat is located behi nd the contactor box cover. On elec tric boilers with two heating elem ents, the therm ostat is connected to one of the heating element lugs. On electric boiler s with four heati ng elements, t he thermostat is located bet ween the center pair of element s at the top of t he elements.

Removing The Boi ler Assembly WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

WARNING:

SHUT OFF THE GAS BEFORE SERVICING THE UNIT.

WARNING:

ALL GAS JOINTS DISTURBED DURING SERVI CING MUST BE CHECK E D FOR LEAKS. CHECK WITH A SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME.

A. CHECK ALL JOINTS PRIOR TO THE

GAS VALVE (SOLENOID) BEFORE LIGHTING UNIT.

B. CHECK ALL JOINTS BEYOND GAS

VALVE (SOLENOID) AFTER UNIT IS LIT.

Blow down the boiler and

Newer Steamer Mod els

allow to cool, if necessary. Ensure that all utilities to the steamer are off. Drain any ex cess water from the boiler . Disconnect the steam supply line, power leads and drain l ines from the cooking compartment top to the boi ler base. Remove the cooking compartment top by unscrewing the bolts holdi ng the cooking compartment top to the boiler base. The bolts are loc ated behind the small louvered access panels on the left and right side of the steamer. Lift the top of f the boiler base and place to t he si de.

Remove the remaining plumbing and elec trical connections from the boiler to t he c ontrols. Remove the bolts securi ng the boiler t o the frame and lift it out. Reverse procedure to i nstall a new boiler.

Older Steamer M odels

- Blow down the boiler and allow to cool, if necessary. Turn off all utilities to the steamer and di sconnect supply lines. Dr ain any excess water from the boiler. Remove the screws holding any control box that would obstruct removal of the boiler through the front of the base.

Disconnect the 1/4 inch diameter water inlet tubing. Disconnect the wir e and c onduit fr om the low water cut-of f probes, high limit thermostat, and the automatic blowdown valve (if so equipped). Uncouple the uni on on the steam outlet and blow down the lines.

Remove all t he scr ews holdi ng the flue and flue collector to the base. Remove t he anc hor screws holding the boiler to the frame. Sli de the boiler forward. T he bur ner box, anchored onl y by the boiler, must be prevented fr om slidi ng forward with the boiler .

Fill and Cold Water Solenoid Valves WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

Removal

1. Turn off the water supply to the steamer.

2. Open the base doors and remov e the two

screws from the top of the boiler control box.

3. Pull the quick connect power leads off the

solenoid valve being serviced.

4. Disconnect the water li nes for the valve being

servi ced and remove the valve from the unit.

5. Reverse procedure to install.

Disassembly NOTE:

It is recommended that the v alve be removed from the unit for cl eaning to prevent damage to the lines and fittings when the stem is removed from the body.

1. Remove the c oil assembly from the valve stem

by lifting up on t he retaining c ap at the top of the solenoid valve and sliding the met al cov er plate off.

2. Clamp the body of the v alve in a vise.

3. Mark a scribe line on the stem nut to the valve

body for proper retightening.

Page 18 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

4. Remove the stem locking nut to remove t he stem f rom the valve body.

5. All parts are now accessible for inspecti on and cleaning.

NOTE:

If internal solenoid parts appear to be damaged or worn, then r eplace the solenoid valve. Do not reuse damaged or worn parts. No internal solenoid parts are available as a service replacement. Pay careful attention to proper orientation and placement of parts during reassembly.

A. Check rubber seal on bottom of plunger . B. Check plunger spring. C. Check O-ring in valve body. D. Check ports in valve body.

6. Reverse procedure to install.

Water Not Being Supplied to Boiler

Turn the steamer on. Check that water suppl y is available to the steamer. A fter approximately 10 minut es, if no water is observed in t he water level gauge sight glass, then chec k for a problem with the water solenoid valve or water level cont r ol probe.

WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

Scalants may be cov er ing the water level cont r ol probe giving a f alse indicat ion of a suf ficient water level in the boiler. Detach, remove and thoroughly clean the water level probe and canister assembl y to remove scalant s and l ime build up. This condition indicat es extremely poor water quali ty being supplied to the boiler and/or boiler cl ean out/and deliming has not been performed. T he water conditi on must be cleared up imm ediately wit h a proper water condit ioner to avoid f ur ther problem s with the steam er . Replace the water l evel pr obes and canister assembl y . Perform a boiler c lean-out and deliming procedure. S ee “BOILER”.

Water may be draining through an open boiler blowdown solenoid v alve as qui c k ly as it’s fed to the boiler. Loose wiring, a burned out coil or particles of scale trapped i n the valve seat may prevent the valve from closing.

Newer steamer models use a plunger type rod that raises and lowers to permit steam/water flow out of boiler. If debris has accumulated around the water orif ice, the plunger may not seat pr oper ly to close off the opening. I f this symptom i s suspect, remov e the solenoid as outlined in “FILL AND COLD WATER SOLENOID VALVES”. Remove any debris found on seali ng surfaces, reassemble and install. If the solenoid valve still does not function properl y , replace it with a new valve and chec k for proper operation.

Older steamer model s have a movable blade and when closed, the blade reac ts as a guillotine that should be free t o move fully down into the valve pocket (projection at bottom of valve) so that the pierced hole in the blade aligns perfectly with the body opening. If debris has accumulated in the bottom of the valve pocket, then the blade will not move into the pocket completely. If this symptom is suspect, remove the solenoid as outlined i n “FILL AND COLD WATER SOLENOID VALVES”.

NOTE:

On this valve body, remove t he two assembly bolts holding the brass body together and remove the loose i nternal parts. Remove any debr is found on seali ng surfaces, reassemble and install. If the solenoid valve still does not func tion properly , replace it with a new valve and chec k for proper operation.

Blowdown Solenoid Valve Does Not Drain

If your steamer has an automatic blowdown drain valve.

Older Models

- when the blowdown timer button is pressed, the boiler blowdown valve opens. If y our steamer has a manual blowdown drain v alve, close the v alve.

Newer Models

- are equipped with nor mally open solenoid valves that close when energized by the main power switch. When the main power switch is turned off, the solenoid valve is de-energized and the boiler blowdown valve re-opens.

The water contai ned in the boil er , being under pressure, should be blown through this valve and be noticeabl y visible exhausting out the steam er dr ain.

If t he blowdown operation appears to func tion sluggishly or not at all, considerable scalants may be lodged in the dr ain pipe and/or the valve. Disconnect the valve f rom the drain line and i nspect both the valve and the drain pipe fixed to the boi ler. If consi derable scalants or l ime build up is apparent, then not only the valve, but also the boiler and water level control must be thoroughly cleaned. S ee “FILL AND COLD WATER SOLENOID VALVES” for a cleaning procedure of a solenoid valve and "BOILER” for a cleaning proc edur e of the boiler.

Page 19 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Steamer Achieves Pressure Sl ower Th an Normal

If t he boiler requires more than 15 minutes (20 minut es for regenerated models) to achi eve normal operating pressure as li sted in below, then check the following conditions.

NORMAL OPERATING

STEAM PRESSURES

UNIT RANGE (PSI)

Gas 8 - 10

Electric 11 - 13

Direct 10 - 12

Regenerated 10 - 12

All Models (With Boiler)

A. A heavy bui ld-up of scal ants has possibly

coated the interior of the boil er . The insulating eff ect of the scalants hampers heat transfer. Unbolt and remov e the hand hole cover plate and gasket assembly. Exam ine interior of boiler and if scalants and/or li me buil d up is apparent, perform a boiler clean-out and deliming pr oc edur e. See “BOILER”. If consi der able scalants are evident, then bot h the boiler blowdown solenoid valve and the water level control must also be examined.

Gas Model s

A. Low incoming gas pressure causes

reduced BTU output . Check incoming line and manifold gas pressures as outlined i n “MANIFOLD PRESSURE ADJUSTMENT.”

B. Gas combination control valve

malfunction. Check incoming and manifol d gas pressures as outlined in “MANIFOLD PRESSURE ADJUSTMENT.” If pressure adjustment s are made and mani fold pressure remains low, replace the combination valve and test unit for proper operation.

C. Gas burner ports clogged or obstruction

around air shutter . After a per iod of time, gas burners can accumul ate carbon in their ports or become clogged by food and grease debris from kitc hen c leaning, restrict ing performance. To clean burners, remove them from burner box and boil in water for 10 -15 minutes to dislodge clog. Clean-out any remaining debris from the gas ports using a wire brush, scribe or pic type met al instrument. Remove any other forei gn objects that appear to be obstructing the gas ports or air shutters.

D. Gas orifice clogged or obstructed around

air shutter. It is possible for debris to become lodged in the smal l gas orifice opening over time. Clean-out the gas orif ice using a round m etal instrument of the same hole diameter or sl ightly sm aller. Clean as needed. If clogging r eappear s, the orifice should be remov ed, cleaned and reinstalled. Remove any other foreign objects that appear to be obstructi ng the gas orifice or air shutt er s.

Electric Mo dels

A. Heavy scale build up on heating element

causes reduced heating.

B. One or more elec tric heating element s

malfunctioning.

C. One or m or e magnetic c ontactors not

pulli ng in, to power heati ng elements.

D. If unit operates under three phase power,

then one of t he phases m ight be lost.

Direct Steam Models

A. Building steam supply pressure low. B. Cooking compart ment steam sol enoid

valve malf unc tion.

C. Steam pr essure regulator adjusted too

low.

D. Clogging in the steam line reduces steam

supply.

Regenerated (S t eam Coil) Steamers

A. Heavy scale build up inside copper steam

coil. B. Building steam supply pressure low C. Cooking compartment steam solenoid

valve malf unc tion.

Page 20 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Inlet Water Strainer

The in-line Y strainer shoul d be located upstream of the fill valve solenoid. Unscrew the cap f r om the body on the leg of the Y that shoul d be pointing downwards toward the floor. Remove the screen and any foreign particles trapped in the opening. Rinse the screen thoroughly to remove accumulated debris and replace the screen in the valve body. If screen can not be thoroughly cleaned, replace it with a new one. Reinstall the cap and ensure that the Y strainer is positioned with t he c ap pointing downward to catch debris.

The pressure regulating valve strainer will become clogged if dirty steam lines are connected to dir ec t steam models. Remove the hex nut on the bottom of the pressure regulating valve to clean the strainer and valve seat.

GAS MODELS

Pilot, Thermocouple or Main Burners WARNING:

POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

DISCONNECT THE ELECTRICAL

NOTE:

settings are m ade, always replace the adj ustment cover scr ew to assure proper gas control operation.

If adjustments in gas or pilot pressure

WARNING:

SERVICING THE UNIT. The pilot thermoc ouple supplies a millivolt signal

(DC) to an int ernal solenoid valve on the gas combination control valve when heated. This solenoid valve is designed to shut off the gas flow to the pilot and main bur ner s i n c ase of a malfuncti on in the system . When ener gized by the thermocouple voltage, the valve is held in the open positi on to permit gas flow. The pilot burner flame is controlled by an adjustable needle valve located under a small cap screw on the combi nation control valve.

When experiencing nuisance pil ot outages, v isually check pilot flame for the proper contact on thermocouple and the flame color. Also, chec k to see that unusually str ong floor drafts are not interfering with pr oper heating of the thermocouple by the pil ot flame.

The pilot flame should be a steady blue flame that envelopes the thermoc ouple tip. The flame should be about one inch l ong wi th half its length extending beyond the outer edges of the pilot shield. If the pilot flame does not appear to be this length and color , then an adjustment is necessary. See the diagram below for an example of un satisf ac tory pilot flames. Turn cloc k wise to dec r ease pi lot flame and counterclockwise to increase.

SHUT OFF THE GAS BEFORE

If adjustment does not resul t in a pil ot flame of proper size, t hen gas might not be flowing properly to the pilot. Check for a plugged pi lot orifice, a kinked or plugged pilot gas supply tube and for l ow gas supply pressure. The pil ot operates unregulated at gas supply pressures while the pressure regulat or in the combination control valve regulat es pressure to the main burners only. V isually check the thermocouple tip (hot end) and tube lead for kinks or pinches that might be causing a short between the tube and the wire i nsi de. Also, check t he threaded connector tip for cor r osi on, tarnish or dir t which can cause a poor connection. If t he thermocoupl e shows either of these signs, it shoul d be r eplaced with a new one.

NOTE:

thermocouple tip t o the control valve is an elec trical connection and must be clean. Do not use any sealing compound on the threads or over tight en the threaded connection. Finger tighten the nut plus 1/4 turn with a wrench. O ver tightening the nut could crush the insulat or , shorting the ther mocouple.

If t he pilot flame is correct and ther e ar e no dr afts, then the problem is in t he thermocoupl e output voltage or the gas solenoid valve in the combination control.

The connecti on of the tubing from the

Page 21 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Check the thermocouple output voltage (DC millivolts) with a VOM. If a meter is not available, replace the t hermocouple with a new one and recheck operation. Fir st, take a closed ci r c uit reading (adaptor r equired) with the pilot on. Next, take an open circuit readi ng by disconnecting the thermocouple tube from the valve and connecting meter leads to the tube and threaded end. Manually press and hold down OFF/PI LOT/ON knob and light the pilot. All ow the pilot to heat the therm oc ouple for one to two minutes and compare the readings with the chart bel ow.

THERMOCOUPLE

READINGS

CLOSED CIRCUIT

Typical 15

Range 10 - 20 20 - 35

OPEN

CIRCUIT

If either of the readings is less than the minimum or thermocouple is not operating as described, replac e the therm ocouple. To replace, rem ove the pilot assembly by di sconnecting thermocouple and pilot gas supply tubing from the c ombination control valve and remov e the two screws holding the pil ot to its brack et. Replace the thermocoupl e or pilot assembly and check for proper operat ion. If after replacing thermocouple, the pilot or main burners are still not functioning properly, then a problem in the gas combination control valve exists as well. Replace the combination control valve as outlined in “GAS COMBINATION CONTROL VALVE REPLACEMENT” then check for pr oper oper ation.

NOTE:

Gas combination control valves are not servi ceable and should not be di sassembl ed. Once you have isolated the problem to t his control, replace it. Do not attempt to repair the assembly.

The mai n burners are lanced port steel burners (5 or 7 burners, depending on the unit) and have adjustable air shutters. Fi xed orifice type hoods are used to establish the gas flow to each burner. Set each burner air shutter opening just large enough to eliminate any yellow tip i n the burner flame.

To remove main burners, lift burner and sl ide it to the rear just enough to clear the gas ori fice hood. Lower the front end of burner and bri ng it for ward under the manifold pipe. When reinstal ling burners, ensure that locating pin i s i n the hole for pr oper positioning and to prevent burner f r om roll ing over .

Automatic Ignitio n Systems

When the main power switch is turned ON and the ignition control modules reset switch is i n the ON position, the ignit ion control module is energized with 24 v olts between terminals five and six.

High voltage is sent from t er minal nine to the spark electrode and an out put of 24 volts i s sent from terminals two and three to the pilot coil in the combination valve, allowi ng gas to flow to the pilot. The sparking will continue for 90 seconds or until the flame sensor has confi r med that an adequate pilot flame is present.

Once the pilot flame is confirmed, a 24 volt output from terminal one will be sent, allowing the cycling coil of the com bination valve to operat e at the request of the cycl ing pressure switch.

Terminals:

1. Main Voltage

- 24V AC will be present on terminal #1 with the pilot sensing elec trode sensing an adequate pilot fam e. This output will remain present as long as the pilot flame remains adequat e.

2. Common (MV/P V ).

3. Pilot Voltage

- 24V AC will be present on terminal #3 at the instant an input voltage is supplied to the module. This voltage will remain present on terminal #3 providing an adequate pilot flame is established within 90 seconds. In the event that an adequate pilot flame is not establ ished within 90 seconds this output voltage will drop out.

4. Ground (burner).

5. Ground (24VAC Neutral) .

6. 24V AC Input.

7. High Voltage to spark el ectrode (The pi lot flame current is sensed by the Ignitor Module via the spark elect r ode high voltage wire and terminal #9).

Page 22 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Spark Ignition Control Test

1. If the ignition contr ol modul e does not appear to be sparking to ignite gas, perform t he following checks.

A. Check to ensure that all electrical terminal

connections on the igniti on c ontrol module and the ignitor are clean and t ight.

B. Verify that the ignition contr ol module and

the ignitor have good ground wire connections. The ignitor mounting brac k et should have good metal t o metal c ontact to its m ounting surfac e.

C. Turn the main power switch ON. Turn the

ignition control modules re-set switch OFF then ON.

D. Check f or 24V A C output on the ignition

control module transformer.

1) If 24VAC is present then replace ignition control module and re-t est.

2) If 24VAC is not present t hen ensure that transformer is receiving 120VAC input. I f igni tion control module transformer is recei ving pr oper voltage, then replace ignition control module t ransformer and r e- test.

2. If the ignition contr ol modul e and transform er are funct ioning properly, then check the following ignitor conditions.

A. The gap between the spark probe and the

ground clip should be approximately 1/8 inch. If the gap appears to be excessive or poor sparking is occur r ing, remove the electronic ignition pil ot and adjust gap.

C. Check the i gnition cable for tightness or

damaged insulation.

3. Check unit for proper operation.

Gas Combination Co ntrol Valve Replacement WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

WARNING:

SHUT OFF THE GAS SUPPLY BEFORE SERVICING THE UNIT.

WARNING:

ALL GAS JOINTS DISTURBED DURING SERVI CING MUST BE CHECK E D FOR LEAKS. CHECK WITH A SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME.

A. CHECK ALL JOINTS PRIOR TO THE

GAS VALVE (SOLENOID) BEFORE LIGHTING UNIT.

B. CHECK ALL JOINTS BEYOND GAS

VALVE (SOLENOID) AFTER UNIT IS LIT.

NOTE:

Gas combination control valves are not servi ceable and should not be di sassembl ed. Once the problem has been isolated to t his control, replace it. Do not attempt to repair the assembly.

Remove the two screws on the control box cov er . Disconnect electrical supply wires and conduit running to the c ombination control valve. Disconnect the thermocoupl e lead and pilot gas supply tube f rom control and pipe connections on each side of t he control. Reverse procedure t o install and check unit for proper operat ion.

Manifold Pressure Adju st ment

B. Inspect the ceramic flame rod insul ator for

cracks or evidence of exposure to ex treme heat, which can permit leakage to ground. If either of these conditions exist, then replace the pilot i gnitor assembly.

Page 23 of 80

WARNING:

DISCONNECT THE ELECTRICAL POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

WARNING:

SHUT OFF THE GAS SUPPLY BEFORE SERVICING THE UNIT.

1. Open the front cabinet doors and turn the Gas

Combinat ion Control Valve OFF.

2. To measure the manifold pr essure, remov e the

1/8 inch NPT plug (pressure tap) on the outlet side of the valve and attach a manometer .

3. Turn the gas combinat ion control valve and the

main power switch to ON.

4. Observe the m anometer pressure reading and

compare to the pressure chart near the end of this procedure.

VSX SERIES ST E AMER - SERVICE PROCEDURES

A. If other appliances are connected t o the

same gas line, turn them all ON and check manometer pressure reading again. If a pressure drop of ½ inch water column or more is observed, then t he gas supply needs to be checked by the gas line installer or the local gas company for adequate sizing.

B. If no other gas appliances are connected

to the gas line and the manifold pressure still requires adjustment, proceed to step

5. Remove the adjustment screw cap to ac c ess the pressure adjustment screw.

A. To increase pressure, turn the screw

clockwise

B. To decrease pressure, turn the screw

counterclockwise

7. Once the correct pressure has been set, turn the power switch OFF, replace the adjustment screw cap and 1/8 inch NPT plug (pressure tap) on the outlet side of the valve.

8. Check unit for proper operation.

ELECTRIC MODELS

Magnetic Contactor WARNING:

POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

The contactor can be serviced by removing t he cover of the contac tor box.

A noisy contactor (hum or chatter) is general ly due to enough dust or dirt on the armat ur e pole faces or around the armature core that the magnet coil cannot pull the armatur e into a completely sealed position. This can usually be c or r ec ted by blowing or wiping the pol e faces clean. To inspect electrical contacts, remov e c over at top of contac tor by removing two screws which hold it in place. Replace contactor if the electric al contacts appear to be pitted or burned.

DISCONNECT THE ELECTRICAL

NOTE:

Accurate gas pressure adjustments can only

be made with the gas O N and the burner lit.

6. After the burner lights, set t he pr essure as outlined below:

PRESSURE READINGS

(INCHES W.C.)

GAS TYPE MANIFOLD

Natural 4.0 7.0 5.0

Propane 10.0 11.0 11.0

RECOMMENDED MIN MAX

* If t he incomi ng line pressure is

LINE

less than

the minimum st ated, then the manifold pressure can not be set correctly.

Heating Element WARNING:

THE FOLLOWI NG ST EPS REQUIRE POW E R TO BE APPLIED TO THE UNI T DURING THE TEST. USE EXTREME CAUTION AT ALL TIMES.

1. Measure the voltage at the heating element

terminals and v er ify it against the dat a plate voltage.

A. If voltage i s corr ec t then proceed to step 2. B. If voltage i s not c or r ec t, check the

following:

1) Voltage supply to the uni t. a. Fuses or breaker blown. b. Power to contactor coils. c. Contactors not pulling in.

(Mechanical)

2. Check current draw (amps) through the heating element lead wires.

See table below for

proper values.

A. If current dr aw is corr ect then heati ng

element is ok.

B. If current dr aw is not c or rect then proceed

to step 3.

Page 24 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

3. Remove the lead wires from the heating element and chec k the element r esi stance using a VOM. A. If resistance readings are not correct, replace heating element.

1) To replace an element, drain water from boi ler shell.

2) Remove cover of c ontactor box, remove electr ic wires to that element's ter minals, r emov e bolts through flange of el ement and pull element forward.

NOTE:

When r eplacing an el ement, al ways use a new gasket and ensure that the flange and tube surfaces which contact the gasket are clean. I f removed element shows a pronounced scale build-up on its heating t ubes, the other elements should be removed and mec hanically c leaned to remove the scal e. This will prolong their life. DO NOT immerse elements in a chemical solution to descale.

4. After new element is installed, check uni t for proper oper ation.

VOLTAGE

208 18 2 9 87 50 14.42 240 18 2 9 75 44 19.20 480 18 2 9 22 76.80

*220/380

240/415

208 24 4 6 116 68 21.63 240 24 4 6 100 58 28.80 480 24 4 6 29 115.20

*220/380

240/415

208 24 2 12 116 68 10.82 240 24 2 12 100 58 14.40 480 24 2 12 29 57.60

*220/380

240/415

208 36 4 9 100 14.42 240 36 4 9 87 19.20 480 36 4 9 44 76.80

*220/380

240/415

208 42 4 10.5 117 12.36 240 48 4 12 116 14.40 480 48 4 12 58 57.60

*220/380

240/415

TOTAL

NUMBER

ELEMENTS

18 2 9 25 19.20

24 2 12 34 14.40

36 4 9 50 19.20

48 4 12 67 14.40

4 6 57.8 28.80

PER

ELEMENT

AMPERAGE

PER LINE

1 PH 3 PH

RESISTANCE

PER

ELEMENT

(OHMS)

NOTES:

1. Values in the table ar e nominal. Tolerance is +/-10 %.

2. Asterisk (*) indic ates 3 phase/4wire.

3. Each heater has three internal elements.

4. 6.0 KW heater s used on older models and included for reference.

Page 25 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

DIRECT S TEAM MODELS

These models consist of a pressure regulator and gauge that run off a buildings potable steam supply. The maximum input pressure to t he r egulator should be 15 psi. Incoming power (120VAC) for the compartment contr ols is supplied f r om a junction box in t he base. See “COOKING COMPARTMENT CONTROLS” under “COMPONENT F UNCTION AND LOCATION” and “COOKING COMPARTMENT” under “SERVICE PROCEDURES”.

REGENERATED S TEAM MODELS ( S TEAM COIL)

The steam coils are intended for use at a steam supply pressure of 15 psi maximum. A pr essure regulati ng valve is available as optional equipment for steamers where the steam supply pressure exceeds 15 psi. T he r egulator used will be of the adjustable type and should be set for a discharge pressure of 15 psi. T his pressure can be monitored by the supplied pr essure gauge. T he r egulator should be set ONLY when steam i s flowing (steam solenoid valve is open). If steam is heavy with condensate, install a ball float trap in the steam line before the pr essure regulating valve.

To remove a steam coil, disconnect union i n steam supply li ne to the coil s and i n the condensate discharge line from the coil s. Remov e header that supplies steam t o c oils by disconnecting union at each coil. In same way, remove coil condensate collection header. Remove four bolt s clamping each coil flange in place and pull c oil f or ward. Use a new flange gasket when replacing coil. The faces that mate with gasket must be clean.

Turn steamer power switch O N, allowing steam generation and, c onsequent ly, pressure to rise to normal operating level and then turn power switch OFF for a final purging of boil er and steam supply lines. Steamer is now ready for use.

COOKING COMPARTMENT

WARNING:

SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, AT T ACH TEST EQ UIPMENT AND REAPPLY POWER TO TEST.

Controls

CERTAIN PRO CE DURE S IN THIS

1. Ensure that vol tage is reaching control cir c uit through compartment pr essure switch, when the mai n power switch is turned ON.

2. On electric heat models with a transform er , check step down transformer for pr oper operation.

3. Check door switch for proper oper ation.

4. Check cooking timer func tion and contact position. See “SCHEMATIC ALL M ODELS COMPARTME NT CONTROLS” under “ELECTRICAL OPERATION”.

5. Check that timer motor oper ates when connected to power. I f a problem is found in tim er, replace it, do not tak e timer apar t.

6. Check wiring for damaged insulation. (no short circuit)

7. Check that all connections and terminals are securely fastened. (no open circ uits)

8. Check that all connections are made ac c or ding to compartment control wiring diagram.

Steam Supply Solenoid

compartment is supplied steam by its own individual steam supply solenoid. These solenoid valves are a standard type and can be di sassembl ed for cleaning.

Newer Steamer Mod els

a solenoid valve is removed from the valve by removing the snap cat c h at the top. Uni ons or compression fittings are provided to all ow easy removal of the v alve bodies. The solenoid valves m ust be removed for disassembly as outlined under “FILL AND COLD WATER SOLENOID VALVES”.

Older Steamer M odels

screws and remove the inlet par t of the body, the compression spring on the back of it and the plastic part now exposed. Unscrew and remove the plunger tube. Remove the plunger (the valve blade is pinned to the lower end of the plunger). The plastic seat at the exhaust side of the valve blade may now be removed from the body. This is a direct acting valve.

The blade m ust be c lean and the blade mating surfaces of the plastic seat members m ust be flat and undamaged. The plunger and plunger tube must be clean and the plunger must slide freel y in the tube. The compression spring which fits in the hole in the top of the plunger must be clean and move freel y .

- Each cooking

- The magnet ic coil of

- Remove the two

For access to compartment controls, remove the right side c ompartm ent panel.

Check for fail ur e of the contr ol circuit in the following order:

Page 26 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Water Accumulating in Compart ment

accumul ation on the bottom of the cooking compartment(s) is primarily condensed steam. Failure to drain out quickly and completely, may be due to clogged debris in the com par tment drain screen. Pull screen straight out and thoroughly clean, then r eplace. Failure to drain completely may also be due to improper leveli ng of the steam er .

Cooking Cycle Cannot Be Activated

wire term inations to ensure they ar e posi tive and secure before assuming any other problem. When the power switch on boiler c ontrol box is ON, set the tim er knob to 2 minutes. Both READY lights should go off, COOKI NG lights should c ome on and steam should be entering both compartments.

Intake Shut-Off Valve Adjustment (S t eam Flow)

1. Remove right side control panel.

2. Open the intake shut-off valve completely.

3. If the steamer ready light is on, then proceed to step 5.

4. If the boiler is off, then tur n main power switch ON and allow boi ler to heat up until steamer ready light comes on. Tur n both cooking timers on and allow boiler to cycle 2 to 3 times, then proceed to step 6.

- Water

- Inspect all

8. Monitor gauge reading 1 to 2 cycles to ensure pressu re is set co rrectly.

9. Once the valve is set, turn both cooking timers off and reinstall right side c ontrol panel.

DOOR

Removal

1. Remove top c over.

2. Open the door.

3. Pull hinge rod up.

4. Reverse the procedure t o install, making sure the door bushings are in place.

Gasket

1. Open the door.

2. Remove screws from the gasket plate.

3. Pull the gasket plate out fr om the door housing and remove the gasket.

4. Position the new gasket on the gasket pl ate and rever se t he pr oc edur e to install . Adjust the door as outlined in “SEALING ADJUSTMENT under "DOOR".

NOTE:

this will com press the gasket excessively and interfere with proper door seal ing.

Do not ov er tighten gasket plate screws as

5. Turn both cooking timers on.

6. Monitor the boiler until heat source turns off.

NOTE:

as nicks or cuts, will cause steam leakage.

Damage to the gasket sealing surface, such

7. At that time, adjust the intake shut-off valve until the manifold psi. The valve setting shoul d be made while the boiler pressure is at the upper cycling lim it.

pressure gauge reads 9 ±1

Page 27 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Sealing Adjustment

1. Check the door gasket quality. If damaged or worn, replace as outl ined in “REMOVAL” under “DOOR”.

2. Loosen screws until the screw heads no longer touch the gasket plate.

3. Tighten screws until screw head touches gasket plate and at t hat point begin counting turns.

4. Tighten all scr ews approximately two turns.

5. Close the door and check unit for proper operation.

6. If necessary, ti ghten all screws an additi onal ½ turn and repeat step 5.

7. Repeat step 6 until the door closes properly and no steam leaks are seen around t he gasket seal.

Handle

1. Open the door.

2. Remove screws from the top and bottom of the door.

3. Pull the inner door panel out from the door housing with the gasket plate and gasket stil l attached.

NOTE:

diamet er fits into the slot in the door and the l atch lever must rest on t op of the handle latch screw.

5. Reverse procedure to install.

Latch Assembly

1. Open the door.

2. Remove screws from the top and bottom of the

When installing the spacers, the smaller

door.

4. Remove the nuts and spacers from t he handle screws and remove the handle fr om the door.

3. Pull the inner door panel out from the door housing with the gasket plate and gasket stil l attached.

4. Remove the screws f r om the side edge of the door that secure the latch mec hanism and remove the lat ch from the door.

NOTE:

top of t he handle latch screw.

5. Reverse procedure to install.

When installing, the latch lever must rest on

Page 28 of 80

VSX SERIES ST E AMER - SERVICE PROCEDURES

Latch Adjustment

Should the cooker door jam and c an not be opened, DO NOT FORCE OR PRY occur.

First, try lifting up on the bottom of the door at the handle end to disengage the latch. I f that does not work, remove the right side panel.

The striker that catches on the door latch is located behind the front fac e of the cooking cavity. Remove the nut f r om the stri k er and this will release it from the panel.

Once the nut and washer have been removed, door will open freely.

Remove any burrs on the stri k er that may cause the latch to stick. Rei nstall the striker and adjust, so door will not jam.

the door as damage wil l

3. Open the door and check the strikers’ slot for horizontal alignment. The slot on the striker must be kept hor izontal in order for the door latch to c atch it proper ly and latch.

4. Once the proper slot al ignment has been set, hold the striker close to i ts base using a rag and vise grips, then tighten the strik er nut. Be careful not to damage the striker slot when tightening or door may not latch properly.

NOTE:

to turn and change al ignment.

Do not over tighten as the striker will begin

To ad just

1. Reinstall the striker with the slot pointing

2. Close the door to center the str iker in the oval

upwards and hand tighten nut onl y .

mounti ng hole.

Page 29 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

ELECTRICAL OPERATION

WATER LEVEL CONTROLS

Solid State Low level Cut-Off & Differential Control

The steamer is equipped with three water level sensing probes (high, low and low level c ut-off) and a single water level c ontrol board. T he water level control boar d per forms two functions: 1) Pr ovide low level cut-off protection to shut off the heat source in case the water level drops below the l ow level c utoff (LLCO) probe. 2) Perform as a differential level control t o maintain the water level between the low and high water level probes.

The water level cont r ol (WLC) has input voltage (120VAC) across terminals 11 and 12 which powers the primary side of the transformer. On one side of the transformer secondary, power i s provided t o the control by a series path through chassis ground (terminal 10). The other side of the transformer secondary (12VAC) i s attached to the probe that directs power to the other side of t he internal relays (LLCO, HL and ILR). As water enters the boil er , it becomes part of the water level control’s circu it. When the water level in t he boiler reaches a probe, that cir cuit is completed.

When the water level drops below the low level ( LL) probe, power is removed from the inverse l atching relay, t he HL relay energiz es thr ough ILR-2 and HL contacts change state. The fill solenoid is energized through HL-3 to refill the boiler and the HL LED i s l it. The HL relay and LED will toggle O N and OFF during a cooking cycl e as needed.

The inverse latching relay of the board is deenergized, leaving the ILR-1 (N.O.) and ILR- 2 ( N.C.) contacts in their shelf state.

When the main power switch is turned ON, power is supplied to the WLC board whic h ener gizes the high level (HL) relay and illuminates the HL relay LED. With the HL-3 cont acts closed, the boi ler fill solenoid is energized and water begins filling the boiler.

When the water level reaches the l ow level c ut-off (LLCO) probe, t he LLCO relay i s energized and illuminates the LLCO LED. With the LLCO-2 contacts cl osed the heat source is then energized. The LLCO relay will rem ain energized and its LED will stay lit until the water level in the boiler drops below the LLCO probe.

When the water level reaches the l ow level ( LL) probe, power to terminal 2 on t he WLC board is present but no switching oc c ur s.

After the water level reaches the hi gh level (HL) probe, the inverse latching relay of the board i s energized and locked through the l ow level pr obe (LL) and ILR-1 contacts. With ILR-2 c ontacts open, this de-energi z es the HL r elay and the HL LED goes out. With t he HL- 3 contacts open, the boiler f ill solenoid is de-energized, stopping t he flow of water into the boiler.

Page 30 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Solid State - Auxiliary Low Level Cut-Off

This control serves as a safety bac k up to the mai n water level control (WLC) board to meet Cal-Code and CSD-1 code requir ements. The operat ion of the auxiliary control is identical to t he low level cut-off (LLCO) f unc tion of the main WLC board but performs a single function: 1) Provide auxiliary low level cut-off protection to shut off the heat source in case the water level drops below the l ow level c utoff (LLCO) probe. A single LLCO probe, identical to the LLCO probe on the main WLC board, is connected to the auxiliary control.

The auxiliary water level control (WLC) has input voltage (120VAC) acr oss terminals 11 and 12 which powers the primary si de of the transformer. On one side of the transformer secondary, power is provided to the control by a series path thr ough chassis ground (terminal 10). T he other side of t he transformer secondary (12VAC) is attached to the control t hat directs power to the other side of t he internal relay (LLCO). As water enters the boiler , it becomes part of the auxiliary water level control’s circuit. When the water level in the boiler r eac hes the LLCO probe, t he c ircuit is complet ed.

When the main power switch is turned ON, power is supplied to the auxiliary WLC board but no switching occurs. On CSD-1 model s, the low water level indi cator li ght (amber) on t he boiler contr ol box comes on.

When the water level reaches the l ow level c ut-off (LLCO) probe, t he LLCO relay i s energized (LLCO-2 close) and the LLCO LED lights up. T he LLCO relay will rem ain energized and its LED will stay lit until the water level i n the boiler drops bel ow the LLCO probe.

When the boiler stops filling, press the manual reset button on the boi ler control box. On CSD-1 models, this energiz es the low water relay, turns off the low water light and ener gizes the heat source auxiliary control. On Cal-Code models, this cl oses and lock s the manual reset switch contacts to energize the heat source auxiliary control.

Page 31 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Electro Mech anical - Lo w level Cut- Off & Different ial Contro l

The steamer is equipped with three water level sensing probes (high, low and low level c ut-off), a differential level control (1G1GO) and a low level cut-off control (1D1DO). The low-level cut-off is an additional control t hat is identical to the differential level control but serves as the saf ety backup to shut off the heat source in case the water level drops below the low level c ut-off (LLCO) probe. The differenti al level contr ol maintains the water level between the low and high water level pr obes.

Each control is powered by input voltage (120V A C) on terminals 1 and 2 which also connect to the primar y si de of the internal transformer . The transfor mer secondary (300VAC) will provide power to the internal contactor coil through a series path goi ng from one si de of the secondary windi ng, through the cont ac tor coil, through the water level control probe, through t he water in the boil er and to the boiler for ground. T he other side of the transformer secondary is attached to the probe that directs power to the other side of the internal contac tor coil.

When the main power switch is turned ON, both water level controls are energized. The boi ler fill solenoid is then energized thr ough the normally closed contacts (termi nals 3 & 4) on the differential l evel c ontrol and water begins filling the boiler.

When the water level reaches the l ow level c ut-off (LLCO) probe, the internal c ontactor coi l on the low water level control is energized. Wi th the contacts on ter minals 7 & 8 now cl osed, the heat source is then energi z ed. The internal contactor coil will remain energized until the water level in the boiler drops below the LLCO probe.

When the water level reaches the l ow level ( LL) pr obe, power to terminal 7 on the di ffer ential l evel c ontrol will be present but no switching oc c ur s.

After the water level reaches the hi gh level (HL) probe, the differential control contactor coi l is energized and t he normally closed contac ts on terminals 3 & 4 open, which de-energi z es the boiler fill solenoid and stops the f low of water into the boiler. The internal contactor coil will have a locking path through cont ac ts 7 & 8 to the low level probe to keep the coil energiz ed after the water level drops below the high level pr obe.

When the water level drops below the low level ( LL) pr obe, the internal contactor c oil is de-energized, returning contacts 3 & 4 back to their normally c losed state and energizi ng the boiler fill solenoid to refill the boiler. The water level must then fill to the high level probe again, to energize the internal c ontactor coil. The differ ential control will toggle ON and OFF during a cooking cycle as needed.

Page 32 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Electro Mechanical - Auxiliary Low Level Cu t - Off

This control serves as a safety bac k up to the mai n low level cut-off (LLCO) c ontrol to meet Cal-Code requirements. The operation of the auxiliary control is identical to the main low level cut-off control but performs a single function: 1) Provide auxiliary low level cut-off protection to shut off the heat source in case the water level drops below the low level c ut-off (LLCO) probe. A si ngle LLCO probe identical t o the LLCO probe on the main low level cut-off contr ol is connected to the auxiliary control.

The auxiliary control is powered by input voltage (120VAC) on t er minals 1 and 2 which also connect to the primary side of t he internal t r ansformer. The transformer secondary winding (300 V A C) will provide power to the internal contactor coil through a series path going from one side of t he secondar y winding, through the c ontactor coil, through the water level control probe, t hr ough the water in the boiler and to the boiler f or gr ound. The other side of the transformer secondary is attached to the LLCO probe which di rects power to the other side of the internal contactor coil.

When the main power switch is turned ON, the auxiliary low level control is energized but no swit c hing occurs. When the water level reaches the l ow level c ut-off (LLCO) probe, the internal c ontactor coi l on the low level

control is energized, closing the contact s on ter minals 7 & 8. The internal contactor coil will remain energized until the water level in t he boiler drops below the LLCO pr obe.

When the boiler stops filling, press the manual reset button on the boiler control box. T his closes and locks the manual reset switc h c ontacts to energize the heat source auxiliary control.

Page 33 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

SEQUENCE OF OPERATION

GAS MODELS

This sequence of oper ation is writt en for steamer s with automatic ignition, sol id state water level controls and the CSD-1 (code) option. Refer to schematic diagram number 3707.

INITIAL FILL AND PREHEAT

1. Conditions. A. Power switch OFF. B. Ignition module reset switch ON C. Doors shut (closes the N.O. door switch

contacts). D. Cooking timers OFF. E. Unit connected to c or r ec t voltage

(120VAC).

1) L1 to one side of the cooki ng compartment pressure switch (N.O.), then to the other c ompartment controls; to one side of the c old water condenser thermostat; to one side of the power ON/OF F switch.

2) NEUTRAL to one side of the cooking compartment contr ols; to one side of the cold water condenser (CWC) solenoid valve; to one side of the power ON/OFF switc h.

F. Unit pr oper ly grounded. (Boiler and water

level control share a comm on gr ound) G. Water supply valve on. H. Gas supply valve on. I. Gas combination control valve on. J. Control ( cycling) pr essure switch closed. K. High limit pressure switch closed. L. Cold water condenser (CWC) thermostat

open. M. Blowdown solenoid valve (drain) open and

boiler empty.

2. Power switch turned O N. (located on boiler control box)

A. Power switch indicator light (red) c omes

on.

B. Hi pressure indicator light (amber) comes

on.

C. Low water lev el indicator light (amber)

comes on.

NOTE:

on and the safety c ircuit de- ener gized until boiler steam pressure is withi n oper ational l imi ts (high limit pressure switch closed) and the m anual reset button is pressed. The low water indicator light will remain on and the safety c ircuit de- ener gized until the water level in the boiler reaches the low level cut-off probes (minimum level) for the water level control, the auxiliary low level cut-off control and the manual reset switch is pressed. The gas burners will not light until these conditions are satisfied.

NOTE:

position, no sparking will occur or if it’s turned off while in ready or c ook mode then pilot and burners will go out and not re-ignite upon call for heat by t he cycling pressure switch.

3. Water l evel r eac hes LLCO (low water level cut-

The high pressure indicator light will remain

D. Water level cont r ol (WLC) is powered.

1) High level (HL) relay is energized, HL-3 (N.O.) contacts close and HL LED light s up.

2) The i nverse lat c hing relay of the board remains de-energized, l eaving the ILR-1 (N.O.) and ILR-2 (N.C.) contacts in their shelf state.

E. Auxiliary low water level cut-off control is

powered, LLCO-2 (N.O.) contacts remain open.

F. With t he HL- 3 and ILR-2 contacts cl osed,

the fill solenoid is energized and water boiler begins filling.

G. Blowdown solenoid valve is energi z ed and

closes.

H. Ignit ion module begins sparking to light

pilot after a 3 second del ay .

1) If pilot igniti on is established (pilot lit) then a mi c ro amp f lame sense current i s sent back to the ignition control module through the ignition cable. Sparking stops, pil ot remains lit and is ready to ignite burners.

2) If pilot igniti on is not established after 90 seconds, sparking stops and the ignition control module loc k s out power to the combination gas valve (pilot valve and m ain valve remain closed). The module remains locked out until the reset switch on the ignition control module box is switched to of f then on to re- star t the ignition trial cycl e.

If t he modules re-set switch is in the off

off) probe for the water level control and to the auxiliary LLCO probe for t he auxiliary low level cut-of f control.

Page 34 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

A. Power to terminal 9 on the water level

control.

1) LLCO relay energizes, LLCO- 2 ( N .O.) contacts close and LED lights.

B. Power to terminal LLCO on the auxiliary

low water level cut-off control.

1) LLCO relay energizes, LLCO- 2 ( N.O.) contacts close and LED lights.

NOTE:

LLCO relays will remain energized and LLCO LED’S will rem ain lit until the water level drops below the LLCO probes or the power switch is turned off.

4. Water reaches LL (low level) probe.

A. Power to terminal 2 on the water level

control is present but no switching occur s.

5. Water reaches HL (high level) probe.

A. Power to terminal 6 on water level control.

1) The i nverse lat c hing relay of the board is energized, changing the state of ILR-1 (N.O.) and ILR-2 (N.C.) contacts. The inverse latching relay will rem ain energized t hr ough the alternate latching pat h of ILR-1 contacts until the water level r ec edes below the low level probe.

2) With I LR- 2 c ontacts open, HL relay is de-energized, HL- 3 ( N.O.) contacts open and HL LED goes out.

C. Auxiliary gas solenoid valve is energiz ed

and opens to allow gas flow.

D. As long as the ignition contr ol modul e is

sensing a pilot flame, the int er nal main valv e (MV) contacts close (N.O.) on the ignition control module. T he main gas valve is energized and gas begins flowing.

E. Burners light and boi ler begins to heat up.

7. Cooking compartment pressure switch closes as boiler steam pressure reaches 3 PSI. (Approximately 14 min.)

A. Cooking compart ment ready l ight (green)

comes on.

NOTE:

If a cook ing timer is set immediat ely aft er the ready light comes on, a loud clanki ng sound wil l be heard (oil c aning) and the ready l ights will flash for several seconds. This condition is caused by the manifold pressure being on t he fringe of the pressure switch set point. When a cook t imer i s set, the compartment steam solenoid valve opens causing the manifold steam pressure to drop, slightly below the pressure switch set point. At the same time, steam pressure is still increasing in the boiler. This opposing condit ion causes a pressure bounce to occur but after t he steam pressure passes approximately 4 psi this condition subsides. Under normal st eam cycling pressures, this condition will not be seen.

8. Boiler steam pr essure reaches upper l imit set

point of 10 PSI. (Appr oximately 15 min.)

3) Water fill solenoid is de-energized. (boiler fill time 4-11 min.)

6. Manual re-set switch is pressed, energizing the coils on the high limit and l ow water rel ay s.

A. Contacts 1 & 9 on the high pressure relay

change state and lock from N.C. to N.O. and turn off the high pr essure i ndicator light. Concurrently, Contacts 1 & 9 on the low water relay change stat e and lock fr om N.C. to N.O. and turn off the low water indicat or light.

B. Contacts 5 & 9 on the high pressure relay

change state and lock from N.O. to N.C., supplying power (NEUTRA L) to one side of the auxiliary gas solenoid valve. Concurrently, Contacts 5 & 9 on the low water relay change stat e and lock fr om N.O. to N.C., supplying power (L1) to the other side of the auxiliary gas solenoid valve.

NOTE:

For both relays to energize, the high pressure switch must be closed and the water level in the boiler must be above the l ow level c ut-off probes in order for LLCO-2 (N.O.) contacts to close.

A. Cycling pressure switch opens, m ain gas

solenoid valve de-energizes, gas flow shuts off and bur ners go out.

B. As boiler heats up and buil ds pressure,

some by-pass water/steam is produced which runs into the steam drain box. This causes the cold water condenser (CWC) solenoid to cycle, cooling the drain water. This solenoid is powered by the CWC thermostat.

NOTE:

Steam should not be seen entering either compartment until a cook time is set. T his energizes the steam solenoid valve of the cooking compartment to allow steam f low.

9. Boiler steam pr essure drops below lower l imit

set point of 8 PSI and the cycling pressure switch closes.

Page 35 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

A. Boiler steam pr essure is maintai ned by the

cycling of the pressure switch between the upper and lower set point limits. The cycling pressure switch continues to energize and de-energize the main gas solenoid valve starting and stopping the flow of gas, which in turn, cycles the burners on and off. This sequence continues until one of the following occurs:

1) Boiler pressurizes to 15 PSI, causing the high limit pressure switch to open. At that time, the aux iliary gas valve de-energizes, shutt ing off the gas flow to t he burners and the high limit failure light will come on. This light will stay lit until the pressure drops below the lower limit set point of 6 PSI and the manual re-set switch is pressed.

2) Boiler water level drops below the LLCO probes for the water level and the auxiliary low level cut-off controls which then de-energi z es the LLCO relays, changing the contact state of LLCO-2 (N.O.) back to open. This deenergizes the main and auxiliary gas solenoid valves. The gas solenoid valves will remain off and the low water level light will come on and stay lit until the water level rises above the LLCO probes and the manual re-set switch is pressed.

COOK CYCLE

1. A Cook cycle should not be started, until the initial fill and preheat is complet ed, in order for the boiler st eam pressure to be within operational lim its.

A. Ready light (green) is lit. B. Product is inserted into steamer. C. Door is closed. D. Timer is dial ed on timer .

2. Contacts 1/3 of cook t imer close. A. Ready light (green) goes out. B. Cooking light ( r ed) c omes on. C. Timer motor is energized. D. Compart ment steam sol enoid valve

energized and steam begins to enter the compartment.

NOTE:

Burners will re-light after the boiler pressure drops below the low pressure set point limit (8 psi) and will stay on until the high pressure set point (10 psi) is reached. A s l ong as steam pressure is within limits, even while cooking, burners can go of f. The boiler is able to re-pressurize to the upper set point limit even with both compartm ents in cook mode.

NOTE:

The cold water condenser t her mostat remains closed and cold water condenser solenoid stays energized while c ook ing. If main water is shut off after boiler fill, then no cold water i s present t o condense steam/hot water and steam v apor s exit the floor drain.

3. Time expires on timer.

A. Timer contacts 1/3 open. B. Steam solenoid valve de-energized,

stopping the flow steam into compartment. C. Cooking l ight goes out. D. Timer contacts 4/1 c lose and energize

buzzer until manual ly turned off. E. Ready light (green) c omes on. F. Ti mer mot or de- ener gized.

4. Timer manually t ur ned off. A. Contacts 1/4 open B. Alarm Buzz er de- ener gized and stops

buzzing.

5. Steamer reverts to preheat cycle until t ime is dialed i nto timer and the door is shut, water level drops below low level cut - off pr obe or the power switch is turned of f.

WATER REFILL (AFTER INITIAL FILL)

1. Water l evel dr ops below low level probe (LL). A. Power is remov ed from terminal 2 on the

water level control .

1) The i nverse lat c hing relay i s deenergized, returning ILR-1 ( N.O.) and ILR-2 (N.C.) contacts back to their original state.

B. HL relay is energized.

1) Contact s HL-3 close.

2) HL LED comes on.

3) Fill solenoid is energized and water flows int o tank.

2. Water reaches LL (low level) probe.

3. Water reaches high level probe.

Page 36 of 80

A. Power to terminal 2 on the water level

control is present but no switching occur s.

VSX SERIES STEAMER - ELECTRICAL OPERATION

A. The inv er se l atching relay of the water

level control is energized, c hanging the state of ILR-1 (N.O.) and ILR-2 (N.C.) contacts.

B. HL relay is de-energiz ed.

1) HL-3 opens.

2) Fill solenoid de-energized and water stops flowing into tank.

3) HL LED goes out.

4. The water refill cycle will occur whenever the water level is below the low level probe and will not affect the operation of either the preheat or cook cycle.

BOILER BLOWDOWN/DRAIN

1. Main power switch turned OFF. A. Boiler blowdown sequence starts. B. The blowdown solenoid valve (N.O.) is de-

energized and valve opens to drain t he boiler.

C. Power is removed f r om all c omponents

except cold water condenser (CWC) thermostat and solenoid valv e. The CWC thermostat cycles as necessary to lower the discharge temperature of the water and condense steam going into the drain.

ELECTRIC MODEL S

2) L2 (NEUTRA L) to in-line fuse (10 amp.); to the other side of the primary on the step down transformer (H2); from the other side of the secondary winding (X1) to the other side of t he cooking compartment controls; t o the other side of the cold water condenser (CWC) solenoid valve; to the other side of the power ON/OFF switch.

E. Unit properly gr ounded. (Boiler and water

level control share a comm on gr ound) F. Water supply valve on. G. Control (cycl ing) pressure switch closed. H. High limit pressure switch closed. I. Col d water c ondenser (CWC) t her mostat

open. J. Blowdown solenoid valve (drain) open and

boiler empty.

2. Power switch turned O N. (located on boiler control box)

A. Power switch indicator light (red) c omes

on.

B. Water level control ( WLC) is powered.

1) High Level (HL) r elay is energized, HL-3 (N.O.) contacts close and HL LED light s up.

This sequence of oper ation is writt en for steamer s with solid stat e water level controls and the CalCode option. Refer to schem atic diagram number

3699.

INITIAL FILL AND PREHEAT

1. Conditions. A. Power switch OFF. B. Doors shut. (closes the N.O. door switch

contacts) C. Cooking timers of f. D. Unit connec ted to correct voltage supply.

1) L1 (HOT ) to in-line fuse (10 amp.); to one side of the pr imary on the step down transform er ( H1) ; from one side of the secondary wi nding (X1) to one side of the c ooking compar tment pressure switch (N.O.), then to the other compartment c ontrols; to one side of the c old water condenser (CWC) thermostat (N.O.); to one side of the power ON/OFF switch.

2) The i nverse lat c hing relay of the remains de-ener gized, leaving t he ILR-1 (N.O.) and ILR-2 (N.C.) contacts in their shelf state.

C. Auxiliary low water level cut-off control is

powered, LLCO-2 (N.O.) contacts remain open.

D. With the HL-3 and ILR-2 contacts cl ose,

the fill solenoid is energized and boiler begins filling.

E. Blowdown solenoid val ve is energized and

closes.

3. Water l evel r eac hes LLCO ( low water level cutoff) probe for the water level control and to the auxiliary LLCO probe for t he auxiliary low level cut-of f control.

A. Power to terminal 9 on the main water

level control.

1) LLCO relay energizes, LLCO- 2 ( N.O.) contacts close and LLCO LE D lights.

B. Power to terminal LLCO on the auxiliary

low level cut-off control.

Page 37 of 80

1) LLCO relay energizes, LLCO- 2 ( N.O.) contacts close and LLCO LE D lights.

VSX SERIES STEAMER - ELECTRICAL OPERATION

NOTE:

LLCO relays will remain energized and LLCO LED’S will rem ain lit until the water level drops below the LLCO probes or the power switch is turned off.

4. Water reaches LL (low level) probe.

A. Power to terminal 2 on the water level

control is present but no switching occur s.

5. Water reaches HL (high level) probe.

A. Power to terminal 6 on the water level

control.

1) The i nverse lat c hing relay of the is energized, changing the state of ILR1 (N.O.) and ILR-2 (N.C.) contacts. The inverse latching relay will rem ain energized thr ough the alternate latchi ng path of ILR-1 c ontacts until the water level recedes bel ow the low level probe.

2) With I LR- 2 c ontacts open, HL relay is de-energized, HL- 3 ( N.O.) contacts open and HL LED goes out.

3) Water fill solenoid is de-energized. (boiler fill time 4-11 min.)

6. Manual re-set switch is pressed.

A. Cycling pressure switch opens, heater

contactors de-energize and power to heating elements is rem oved.

B. As boiler heats up and buil ds steam

pressu re, so me by-pass water/stea m i s produced which runs in to the steam drain box. This causes the cold water condenser (CWC) solenoid to cycle, cool ing the drain water. This solenoid is powered by the CWC thermostat.

NOTE:

Steam should not be seen entering either compartment until a cook time is set. T his energizes the steam solenoid valve of the cooking compartment to allow steam f low.

9. Boiler steam pr essure drops below lower l imit

set point of 11 PSI and the cycling pressure switch closes.

A. Boiler steam pr essure is maintai ned by the

cycling of the pressure switch between the upper and lower set point limits. The cycling pressure switch continues to energize and de-energize the heati ng element contactor(s), which in turn, cycles the heating elements on and of f. This sequence continues unti l one of the following occurs:

A. Manual reset switch contact s (N.O.) close

and lock.

B. Heater contactors are energized, suppling

power to the heating elements.

C. Water in boi ler heats up.

7. Cooking compartment pressure switch closes as boiler steam pressure reaches 3 PSI. (Approximately 14 min.)

A. Cooking compart ment ready l ight (green)

comes on.

NOTE:

8. Boiler steam pr essure reaches upper l imit set

point pressure of 13 P S I. (Approx imately 15 min.)

1) Boiler pressurizes to 15 PSI, causing the High Limit pressure switch t o open. At that time, the auxiliary heating element contactors are deenergized, shutting off power to the heating elements. The pressure switch will remain open until the pressure drops below the lower limit set point of 6 PSI and the manual reset switch is pressed.

2) Boiler water level drops below the LLCO probes for the water level and the auxiliary low level cut-off controls which de-energizes the LLCO relays and changes the contact state of LLCO-2 (N.O.) back to open. This deenergizes the main and auxiliary heating element contactors, shutting off power to the heating elements. The heating elements will remain off until the water level rises above the LLCO probes and the manual re-set switch is pressed.

COOK CYCLE

1. A Cook cycle should not be started, until the initial fill and preheat is complet ed, in order for the boiler st eam pressure to be within operational lim its.

Page 38 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

A. Ready light (green) is lit. B. Product is inserted into steamer. C. Door is closed. D. Timer is dial ed on timer .

2. Contacts 1/3 of cook t imer close. A. Ready light (green) goes out. B. Cooking light ( r ed) c omes on. C. Timer motor is energized. D. Compart ment steam sol enoid valve

energized and steam begins to enter the compartment.

NOTE:

Heating elements will come on after the boiler pr essure drops below the l ow pressure set point (11 PSI) and will stay on until the high pressure set point (13 PSI ) is reached. As long as steam pressure is withi n these limits, even while cooking, heat ing elem ents can go off . The boiler is able to re-pr essuriz e to the upper set point, even with both compartment s i n c ook mode.

NOTE:

3. Time expires on timer.

A. Timer contacts 1/3 open.

1) The i nverse lat c hing relay i s deenergized, returning ILR-1 ( N.O.) and ILR-2 (N.C.) contacts back to their original state.

B. HL relay is energized.

1) Contact s HL-3 close.

2) HL LED comes on.

3) Fill solenoid is energized and water flows int o tank.

2. Water reaches LL (low Level) pr obe. A. Power to terminal 2 on the water level

control is present but no switching occur s.

3. Water reaches high level probe. A. The inv er se l atching relay of the is

energized, changing the state of ILR-1 (N.O.) and ILR-2 (N.C.) cont ac ts.

B. HL relay is de-energiz ed.

1) HL-3 opens.

2) Fill solenoid de-energized and water stops flowing into tank.

3) HL LED goes out.

4. The water refill cycle will occur whenever the water level is below the low level probe and will not affect the operation of either the preheat or cook cycle.

BOILER BLOWDOWN/DRAIN

B. Steam solenoid valve de-energized,

stopping the flow steam into compartment. C. Cooking l ight goes out. D. Timer contacts 4/1 c lose and energize

buzzer until manual ly turned off. E. Ready light (green) c omes on. F. Ti mer mot or de- ener gized.

4. Timer manually t ur ned off. A. Contacts 1/4 open B. Alarm Buzz er de- ener gized and stops

buzzing.

5. Steamer reverts to preheat cycle until t ime is dialed i nto timer and the door is shut, water level drops below low level cut - off pr obe or the power switch is turned OFF.

WATER REFILL (AFTER INITIAL FILL)

1. Water l evel dr ops below low level probe (LL). A. Power is remov ed from terminal 2 on the

water level control.

1. Main power switch turned OFF. A. Boiler blowdown sequence starts. B. The blowdown solenoid valve (N.O.) is de-

energized and valve opens to drain t he boiler.

C. Power is removed f r om all c omponents

except cold water condenser (CWC) thermostat and solenoid valv e. The CWC thermostat cycles as necessary to lower the discharge temperature of the water and condense steam going into the drain.

Page 39 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

PAGE PURPOSELY LEFT BLANK

Page 40 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

SCHEMATICS, GAS STEAMERS, BOILER CONTROLS

Manual Ignition, Standard Controls

VSX24G, 36G AND 42GT

Page 41 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Electronic Ignition, Standard Controls

Page 42 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Manual Ignition, CSD-1 Code Controls

Page 43 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Electronic Ignition, CSD-1 Code Controls

Page 44 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 45 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

WIRING DIAGRAMS, GAS STEAMERS, BOILER CONTROLS

VSX24G, 36G AND 42GT

Manual Ignition, Standard Controls

Page 46 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 47 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Electronic Ignition, Standard Controls

Page 48 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 49 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Manual Ignition, CSD-1 Code Controls

Page 50 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 51 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Electronic Ignition, CSD-1 Code Controls

Page 52 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 53 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

SCHEMATICS, ELECTRIC ST EAMERS, BOILER CONTROLS

Auto Blowdown, Standard Controls

VSX24E, 36E AND 42ET

Page 54 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Cal-Code Controls

Page 55 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Standard Controls

Page 56 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Cal-Code Controls

Page 57 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

WIRING DIAGRAMS, ELECTRIC STEAMERS, BOILER CONTROLS

VSX24E, 36E AND 42ET

Auto Blowdown, Standard Controls

Page 58 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 59 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Cal-Code Controls

Page 60 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 61 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Standard Controls

Page 62 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 63 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Step Down Transformer, Standard Controls

Page 64 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 65 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Step Down Transformer, Cal-Code Controls (2 contactors)

Page 66 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 67 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Auto Blowdown, Step Down Transformer, Cal-Code Controls (4 contactors)

Page 68 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 69 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

WIRING DIAGRAMS, ELECTRIC HEATER CIRCUITS

VSX24E, 36E AND 42ET

Standard and Cal-Code/CSD-1 Controls (Newer Models)

Page 70 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

Standard and Cal-Code Controls (Older Models)

Page 71 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

3 Phase, 4 Wire (O lder Models)

Page 72 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

SCHEMATIC, DIRECT STEAMERS, CABINET BASE

VSX24D, 36D AND 42DT

See “SCHEMAT IC ALL MODELS - CO M P A RTMENT CONTROLS”

WIRING DIAGRAM, DIRECT ST EAMERS, CABINET BASE

VSX24D, 36D AND 42DT

See “WIRING DI A GRAM ALL MODELS - COMPARTMENT CONTROLS”

Page 73 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

WIRING DIAGRAMS, REGENERATED STEAMERS, BOILER CONTROLS

VSX36R AND 42RT (OLDER MODELS)

Manual Blowdown

Page 74 of 80

Auto Blowdown

VSX SERIES STEAMER - ELECTRICAL OPERATION

Page 75 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

SCHEMATIC ALL MODELS - COMPARTMENT CONTROLS

Page 76 of 80

VSX SERIES STEAMER - ELECTRICAL OPERATION

WIRING DIAGRAM, ALL MODELS - COMPARTMENT CONTROLS

Page 77 of 80

VSX SERIES STEAMER - TROUBLESHOOTING

TROUBLESHOOTING

ALL MODELS

WARNING:

Compartment leaks water around door. 1. Steamer not level.

Cold water condenser not operat ing properly.

Steam leaks around door. 1. Worn gasket - See “DOOR” in “SERVICE PROCEDURES ”.

Steam generated inside compartment when timer is off .

CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TESTS OR

SYMPTOM POSSIBLE CAUSES

2. Drain line obstructed or not to an open gap drai n.

1. Cold water condenser solenoid inoperat ive or plugged.

2. Lack of water supply.

3. Cold water condenser thermostat malfunction or needs adjustment.

4. No power to cold water condenser solenoid.

5. Plugged spray nozzle.

2. Damaged gasket.

3. Drain line obstructed or not to an open drai n.

1. Steam supply solenoi d not fully closing (c logged or dirty ). See “FILL AND COLD WATER SOLENOID VALVES” in “SERVICE PRO CE DURE S ”.

2. Timer contacts 1 & 3 closed.

Heat coming on without water in boiler (Dry firing).

Pressure relief v alve opening or leaki ng. 1. Cycling pressure switch set to hi gh. See “PRESSURE

Base unit will not heat or build pressure. 1. Check inc oming voltage.

1. Dirty water level probes (shorted t o gr ound) .

2. Retention of water in probe canister assembly.

3. Water l evel c ontrol m alfunct ion.

SWIT CHES (GAS AND ELECTRIC MODELS)” in “SERVICE PROCEDURES”.

2. Pressure relief valve malfunct ion.

2. Boiler not filled - check fill solenoid for power, c logging or malfunction.

3. Water Level Contr ol mal functi on.

4. Water too “pure” for probes to proper ly conduct el ec tricity.

5. Contactor malfuncti on (electric only).

6. Heating element inoperative (el ec tric only ) .

7. Cycling pressure switch open or set too high. Unit is cycling on high li mit.

8. High limit thermostat open.

9. Problem with aut o blowdown timer (ol der models).

10. Power switch m alfunct ion.

11. Pressure reduci ng valve m alfunct ion or needs cleaned (direct or r egener ated units only).

12. Low or no steam supply to unit (di r ec t or regenerated units only).

Page 78 of 80

VSX SERIES STEAMER - TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSES

Steam out put low or slow cooking. 1. Blocked steam injector por ts. (Open door, press door switch

Unit leak s water. 1. Loose water, steam or dr ain line connec tions (top or base).

Boiler water level too high. 1. Fill solenoid does not shut off.

Boiler does not fill. 1. W ater supply not on.

button and verify good steam flow into compartment)

2. Steam solenoid valve not fully opening or blocked.

3. Steam intake shut-off valve cl osed or out of adjustment. See “INTAKE SHUT-OFF VALVE ADJUSTMENT (STEAM FLOW)” in “SERVICE PRO CE DURE S ”.

4. Cycling pressure switch malfunction or needs adjustment .

5. Steam header li ne (supply) blockage.

6. Heavy amount of condensate in t he pressure controls steam supply li ne.

7. Pressure relief valve leaking.

8. Steam supply lines leaking badl y .

2. Boiler hand hole gasket not sealing.

3. Leak at gauge glass.

2. High level probe dirty (open circui t).

3. Water l evel c ontrol m alfunct ion.

2. Fill solenoid not opening or plugged.

3. Water l evel c ontrol m alfunct ion.

Tim er motor does not run. 1. Door open or door switch inoperati ve.

2. Timer not get ting power.

3. Timer motor inoperat ive.

Door not closi ng pr oper ly. 1. Door latc h assembly mal functi on or out of adjustment. See

Door won’t open. 1. Latch won’t release see “DOOR” in “SERVICE

Buzzer not operating. 1. Timer malfunction.

“DOOR” in “SERVICE PROCEDURES”

2. Striker adjustment. See “DOOR” in “SERVICE PROCEDURES”

PROCEDURES”.

2. Buzzer malfunction.

Page 79 of 80

VSX SERIES STEAMER - TROUBLESHOOTING

GAS MODELS ONLY

SYMPTOM POSSIBLE CAUSES

Burner won’t light. 1. Gas not on.

2. Ignit i on control modul e reset switch in the OFF posi t ion or malfunctioning.

3. Ignit i on module not receiving power. Check ignition m odule transformer for 24VAC output to m odule on automatic i gnition systems.

4. Unit not pr operly gr ounded and/or polarity of i ncoming power is incorrect on autom at i c i gnition systems.

5. Low incom i ng gas pr essure. See “MANIFOLD PRESSURE ADJUSTMENT” in “SERVICE PROCEDURES”.

6. Ignit ion module mal function.

7. Gas com bination control valve malfuncti on.

8. Boiler not filling. Check fill solenoid for power, clogging or malfunction.

9. Water level control malfunction.

10. Water too ”pure” for probes to properly conduct electricity.

11. High li mit thermostat open (if equipped).

12. High li mit pressure switch open.

13. Cycling pr essure switch open or set too high. Unit is cycling on high limit. See “PRESSURE SWITCHES (GAS AND ELECTRI C MODELS) in SERVI CE PROCEDURES”.

Burner won’t stay l i t . 1. Gas pressure low. See “MANIFOLD PRESSURE ADJUSTMENT”

Pilot not l i t or goes out. 1. Gas not on.

Spark Ignitor not spar ki ng. 1. Incorrect spark gap setti ng. See “AUTOMATIC IGNITION

in “SERVICE PROCEDURES”.

2. Ignit ion module mal function.

3. Check gas orifice for obstr uct i on.

2. Low incom i ng gas pr essure.

3. Check thermopile millivolts.

4. Pilot going out due to drafts, excess steam from dr ain or unit not level. Improper venting can dir ect the pilot flame away from thermopile or flame sensor.

5. Pilot not adjusted correctly. See “PILOT, THERMOCOUPLE OR MAIN BURNERS” in “SERVICE PROCEDURES”.

6. Burners ignite too viol ently. Check gas pressure to the unit. See “MANIFOLD PRESSURE ADJUSTMENT” in “SERVICE PROCEDURES”.

7. If aut o i gnition and no sparking - ignition module malfunct i on.

8. Wrong pilot assembly used.

SYSTEMS” in “SERVICE PROCEDURES”.

2. Poor ground between pilot bracket and burner.

3. Loose, broken or damaged lead wires (includi ng gr ound) f r om ignition module to ignit or .

4. Ignit or boot on ignition cable loose, dam aged or missing causing excessive ignition vol t age leakage.

5. Ceramic f l ame rod insulator on i gnitor cracked or damaged from extr eme heat.

6. Ignit i on module not receiving power.

7. Ignit ion module mal function.

Form 24627 (D ec ember 98) Printed in U.S.A.

Vulcan Materials VSX24E, VSX36G, VSX36R, VSX24G, VSX42GT User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual