VL SERIES STEAMER - ELECTRICAL OPERATION
| NOTE: Power the internal contactors on |
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| 1) Boiler pressurizes to 15 PSI, causing | ||
| the low level |
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| the high limit pressure switch to open. | ||
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| At that time, the auxiliary heating | |||
| drops below the LLCO probes or the power |
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| element contactor(s) are de- | ||
| switch is turned OFF. |
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| energized, shutting off power to the | ||
4. | Manual reset switch is pressed (momentary). |
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| heating elements. The pressure | ||
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| switch will remain open until the | ||||
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| A. The auxiliary heater contactor is energized |
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| pressure drops below the lower limit | ||
| supplying power to the heating elements |
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| set point of 6 PSI. Boiler water level | ||
| and the heat light (amber) comes on. |
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| drops below the LLCO (low water | ||
| 1) Water in boiler heats up. |
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| level | ||
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| B. Internal relay on manual reset switch is |
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| off controls, | ||
| energized. |
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| contactor on both controls. This de- | ||
| 1) Normally open contacts close and |
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| energizes the main and auxiliary | ||
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| heater contactors, shutting off power | |||
| lock to provide power to the auxiliary |
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| to the heating elements. The heating | |||
| heater contactor and the heat light |
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| elements will remain off until the | |||
| after the reset switch is released. |
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| water level rises above the LLCO | |||
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5. Water reaches LL (low level) probe. |
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| probes and the manual | |||
| A. Power to terminal 7 on the differential |
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| is pressed. | ||
| COOK CYCLE | |||||
| level control is present but no switching | |||||
| occurs. | 1. A Cook cycle should not be started, until the | ||||
6. Water reaches HL (high level) probe. | ||||||
initial fill and preheat is completed, in order for | ||||||
| A. Power to terminal 10 on the differential | the boiler steam pressure to be within | ||||
| operational limits. | |||||
| level control. | |||||
| A. | Insert product into steamer. | ||||
| 1) The internal contactor coil on the | |||||
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| differential level controls is energized. | B. Compartment door is closed and screw | ||||
| a. The normally closed contacts on |
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| handle tightened down. | ||
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| terminals 3 and 4 open, de- | C. Compartment steam control arm is pulled | ||||
| energizing the boiler fill solenoid |
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| forward and latches, allowing steam to | ||
| and the boiler stops filling. |
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| enter compartment. | ||
| NOTE: The internal contactor coil has a | NOTE: Cool air and condensate exit through | ||||
| locking path through contacts on terminals | the steam exhaust solenoid valve (N.O.) under | ||||
| 7 & 8 to the low level probe to keep the | “Full Free Venting” until the compartment | ||||
| coil energized after the water level drops | temperature reaches 180°F. When the solenoid | ||||
| below the high level probe. | valve energizes and closes, condensate will | ||||
7. | Boiler steam pressure reaches upper limit set | continue to exhaust through a small opening | ||||
the valve under “Limited Free Venting” until the | ||||||
| point of 11 PSI. (Approximately 15 min.) | |||||
| solenoid valve | |||||
| A. Cycling pressure switch opens, heater | |||||
| minute before the end of a cook cycle. | |||||
| contactor(s) | D. | Time is dialed on timer (past 5 minutes). | |||
| heating elements is removed. | |||||
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| 1) Micro switch SW1 contacts change | |||
| NOTE: Steam should not be seen entering a |
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| state from N.C. to N.O. | |||
| compartment until the manual steam control |
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| 2) Micro switch SW2 contacts also | |||
| arm is pulled forward and locked. |
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8. | Boiler steam pressure drops below lower limit |
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| change state from N.C. to N.O. | ||
E. | Compartment power switch is turned ON. | |||||
| set point of 9 PSI and the cycling pressure | |||||
| switch closes. |
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| 1) L1 (HOT) to one side of the thermal | ||
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| A. Boiler steam pressure is maintained by the |
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| switch. | ||
| cycling of the pressure switch between the |
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| NOTE: L2 (NEUTRAL) is connected to the | ||
| upper and lower set point limits. The |
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| other side of the buzzer, steam exhaust | |||
| cycling pressure switch continues to |
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| solenoid valve, trip solenoid, pilot light and | |||
| energize and |
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| timer motor. | |||
| element contactor(s), which in turn, cycles |
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| the heating elements on and off. This |
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| sequence continues until one of the |
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| following occurs: |
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| Page 46 of | 88 |
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