Vulcan-Hart C24GA6 ML-136021, C24GA10 ML-136022 service manual Troubleshooting, General

C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING

TROUBLESHOOTING

General

The following paragraphs provide descriptive information of the most common troubles that can occur in the steamer. The Troubleshooting Chart provides a list of other typical fault conditions. The left-hand column of the table lists typical symptoms and the right-hand column lists probable causes and the suggested remedies.

Water Not Being Supplied to Generator

Turn the steamer on. Check that water supply is available to the steamer. After approximately 10 minutes, if no water is present, then check for a problem with the water solenoid valve or water level control probe.

Scalants may be covering the water level control probe giving a false indication of a sufficient water level in the generator. Detach, remove and thoroughly clean the water level probe assembly to remove scalants and lime build-up. This condition indicates extremely poor water quality being supplied to the generator and/or generator clean out and deliming has not been performed. The water condition must be cleared up immediately with a proper water conditioner to avoid further problems with the steamer. Replace the water level probes and canister assembly. Water may be draining through an open generator solenoid valve as quickly as it’s fed to the generator. Particles of scale trapped in the genera- tor solenoid valve seat may prevent the valve from closing.

Pilot Or Main Burner Will Not Light

Check blower air pressure, air pressure switch adjust- ment, pilot burner adjustment, gas inlet and manifold pressures. The pilot burner orifice should be a 1/8" hole.

Drain Solenoid Valve Does Not Drain

The drain solenoid valve is normally closed when the main power switch is in the on position. When the main power switch is set to off, the solenoid valve is ener- gized and the generator drain valve opens for 1000 seconds.

Water contained in the generator, being under pressure, should be draining through this valve and be noticeable exhausting out the steamer drain.

If the drain operation appears to function sluggishly or not at all, scalants may be lodged in the drain pipe and/ or the valve. Disconnect the drain solenoid valve from the drain line and inspect both the valve and the drain pipe fixed to the generator. If considerable scalants or lime build-up is apparent, then not only the drain solenoid valve, but also the generator and water level control must be thoroughly cleaned.

Water Accumulating in Compartment

Water accumulation on the bottom of the cooking compartment(s) is primarily condensed steam. Failure to drain out quickly and completely may be due to debris in the compartment drain screen. Pull screen straight out and thoroughly clean, then replace. Failure to drain completely may also be due to improper leveling of the steamer.

Cooking Cycle Cannot Be Activated

Inspect all wire terminals to ensure they are positive and secure before assuming any other problem. When the power switch on generator control box is in the on position, set the timer knob to 2 minutes. Both Ready lights should go off, Cooking lights should come on and steam should be entering both compartments.

Steamer Achieves Pressure Slower Than Normal

If the generator requires more than 18 minutes to achieve normal operating pressure of 3 – 4 psi, then check the following conditions.

A.A heavy build-up of scalants has possibly coated the interior of the generator. The insulating effect of the scalants hampers heat transfer. Unscrew and remove the clean-out port plug on the bottom of the generator. Using a small mirror examine interior of generator and if scalants and/or lime build-up is apparent, perform a generator clean-out and deliming procedure (see DELIMING THE GENERATOR). If considerable scalants are evident, both the generator drain solenoid valve and the water level control must also be examined.

B.Low incoming gas pressure. Check the incoming line and manifold gas pressures as outlined in MANIFOLD PRESSUREADJUSTMENTunder

SERVICE PROCEDURESANDADJUSTMENTS.

C.Gas combination control valve malfunction. Check the incoming and manifold gas pressures as outlined in MANIFOLD PRESSURE ADJUSTMENT under SERVICE PROCEDURES ANDADJUSTMENTS.

If pressure adjustments are made and manifold pres- sure remains low, replace the gas combination control valve and test the steamer for proper operation.

D.Gas orifice clogged or obstructed around air shutter. It is possible for debris to become lodged in the small gas orifice opening over time. Clean out the gas orifice using a round metal instrument of the same hole diameter or slightly smaller. Clean as needed. If clogging reappears, the orifice should be removed, cleaned, and reinstalled. Remove any other foreign objects that appear to be obstructing the gas orifice or air shutter.

Page 33 of 40 F35425 (February 2006)