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VHX SERIES STEAMERS - COMPONENT FUNCTION
Relay Board . . . . . . . . . . . . . . . . . . . Provides a centralized location for wire harness connections and power transfer through board relays
NOTE: The relay’s below are mounted on the relay board and are not individually replaceable. K1 Relay . . . . . . . . . . . . . . . . . . . . . .
K2 Relay | Energized when high limit pressure switch is closed (high limit pressure | |||
| condition satisfied). When K1 & K2 are energized, the ready light (green) | |||
| will be ON. |
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K3 Relay | When Aux LLCO is satisfied and the manual reset switch is activated, | |||
| K3 is energized. When K3 is energized, turns water error light OFF and | |||
| allows the ignition sequence to begin. K3 must be energized for ignition | |||
| sequence to begin. |
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K4 Relay | Energized when K2 contacts are closed and manual reset switch is | |||
| activated. When K4 is energized, the high pressure light is OFF. When | |||
| K3 and K4 are both energized, power to the ignition system is supplied. | |||
K5 Relay | Energized when operating conditions are met and reset switch is | |||
| activated. Provides power to start combustion blower. | |||
K6 Relay | Energized by time delay circuit for approximately 15 seconds. When K6 | |||
| and K7 are energized, power is supplied to the pilot gas valve. | |||
K7 Relay | Energized when pilot voltage (PV) from the ignition module is present. | |||
| Also used in the time delay circuit. |
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Pilot | Ignites to light the main burner upon a call for heat. | |||
Main Burner | Heats the water in the boiler to generate steam. |
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Water Level |
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Gauge Assembly | Permits a visual confirmation the water level is being maintained in | |||
| boiler during operation. The correct water level is approximately one | |||
| visible inch in the glass. The manual valves at the top and bottom of this | |||
| assembly must be fully open and only closed if the glass tube is | |||
| damaged. |
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Water Inlet Valve (manual) | The water inlet valve is used to stop water flow to the steamer when the | |||
| steamer is being serviced. This valve should remain open during normal | |||
| operation. |
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Inline Water Strainer | A "Y" strainer is installed upstream of the blowdown solenoid valve to | |||
| prevent foreign matter from becoming lodged in the valve. A strainer | |||
| (not supplied) should also be installed in the water supply line to prevent | |||
| foreign matter from becoming lodged in the fill or cold water condenser | |||
| solenoid valves and to keep unwanted particles out of the system. | |||
Pressure Relief Valve | A mechanical device that opens to relieve steam pressure in the boiler if | |||
| the pressure exceeds 13 psi. |
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High Pressure Relief Valve | A | |||
| the boiler if the pressure exceeds 15 psi. |
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Descaler | Hangs below the water level inside the boiler and is used to help control | |||
| boiler surface scaling. Two descalers are used in each boiler. | |||
Boiler Pressure Gauge | Indicates the amount of steam pressure in the boiler. | |||
Steam Header Assembly | Main steam supply line from the boiler to the steam header inlet in the | |||
| cooking control compartment. |
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| Page 11 of 68 |
| F24700 (October 2001) |
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