Vulcan-Hart VHX24E5, ML-126857, ML-126853, MHB24E manual Heating Element Test, Cooking Compartment

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

HEATING ELEMENT TEST

VOLTAGE	KW PER	AMPS PER	OHMS PER
	ELEMENT	ELEMENT	ELEMENT
208	9.0	14.4	14.4
240	9.0	12.5	19.2
480	9.0	6.3	76.8
208	10.5	16.9	12.4
208	12.0	19.3	10.8
240	12.0	16.7	14.4
480	12.0	8.3	57.6
NOTES:	1. Values in the table are nominal.
	Tolerance is +5/-10%.

2.Voltage values are @ 60HZ.

3.Resistance values (ohms) are @ room temperature. If heating elements are

above room temperature, the measured resistance will be greater.

4.Each heating element has 3 separate internal elements.

1.Access the heating elements as outlined in

REMOVAL AND REPLACEMENT OF PARTS.

2.Measure voltage at heating element terminals and verify it against data plate voltage.

A.If voltage is incorrect, see

TROUBLESHOOTING.

B.If voltage is correct, continue with procedure.

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

NOTE: Checking current draw is the preferred method over a resistance check when a clamp on type amp meter is available.

A.If current draw is correct then heating element is functioning properly. See table for proper values.

B.If current draw is not correct, turn power switch off and disconnect the electrical supply.

1)Install a replacement heating element.

C.If unable to check current draw, a resistance check may indicate a malfunctioning element.

1)Turn power switch off and disconnect power to machine.

2)Remove lead wires from heating element and check resistance (ohms). See table for proper values.

4.Check for proper operation.

COOKING COMPARTMENT

NOTE: Before proceeding with intake shut-off valve adjustment, monitor boiler pressure gauge and verify boiler is operating between 10-12 PSI. If boiler pressure adjustment is necessary, refer to CYCLING PRESSURE SWITCH ADJUSTMENT.

Intake Shut-Off Valve Adjustment (Steam Flow)

1.Remove right side compartment panel.

2.Allow boiler to fully pressurize (heat turns off).

NOTE: The intake shut-off valve adjustment should be made while boiler pressure is at the upper cycling limit.

3.Turn both cooking compartment timers on.

4.Open the intake shut-off valve completely.

5.Slowly begin to close the intake shut-off valve and monitor manifold pressure gauge. Adjust the valve until manifold pressure gauge reading is between 8-10 PSI.

6.Monitor manifold pressure gauge reading for two complete boiler cycles.

A.If the manifold pressure gauge reading stays within tolerance while the boiler is cycling, the intake shut-off valve is set correctly.

B.If the manifold pressure gauge reading is outside of the tolerance repeat the adjustment.

7.Once the steam supply manifold pressure is set correctly, turn both cooking timers off and install right side compartment panel.

F25154 (February 2004) Page 22 of 48