Vulcan-Hart MHB24E, ML-126857 manual Vhx Series Steamer - Troubleshooting, Symptom, Possible Causes

VHX SERIES STEAMER - TROUBLESHOOTING

SYMPTOM		POSSIBLE CAUSES
Condenser drain box leaking.	1.	Grommets or cover panel gasket not sealing.
	2.	Clog in drain line plumbing.
	3.	Drain restricted due to drain pipe size below 1-1/4" NPT.
	4.	Drain extension plumbing not at the proper slope or plumbing
		too lengthy.
	5.	Steamer drain not plumbed to an open air gap drain.
	6.	Steamer draining while under pressure and relief valve opening
		at the same time (flooding drain box).
	7.	Cold water condenser spray is over spraying.
	8.	Cold water condenser cycling thermostat out of adjustment or
		malfunction.
Excessive steam vapors exiting from	1.	Water supply for cold water condenser line off or inline strainer
drain.		clogged.
	2.	Cold water condenser solenoid not receiving power, clogged or
		malfunction.
	3.	Clogged spray nozzle (condenser drain box).
	4.	Water supply pressure high; or high pressure in line due to
		water hammer, causing improper valve operation.
	5.	Cold water condenser thermostat out of adjustment or
		malfunction.
Heat coming on without water in boiler	1.	Lime scale build-up on water level probes.
(Dry firing).	2.	Retention of water in probe housing (three probe assembly or
		single AUX LLCO probe).
	3.	Air equalization tubes clogged.
	4.	Water level control malfunction.
	5.	Auxiliary water level control malfunction.
	6.	Reset switch malfunction.
	7.	K1, K2, K3, K4 relays malfunction.
	8.	Relay board malfunction.
Excessive time for boiler to reach	1.	Supply voltage incorrect.
operating pressure (over 15 min.).	2.	Heating elements not wired correctly.
	3.	Contactor(s) malfunction.
	4.	Water supply off or low pressure, filtering system clogged,
		boiler fill valve clogged or malfunction.
	5.	Manual blowdown valve on water level probe housing open.
	6.	Boiler blowdown/drain solenoid valve clogged and not fully
		closing.
	7.	Steam trap malfunction (stuck open).
	8.	Pressure relief valve leaking (pressure below 15PSI).
	9.	Cooking compartment steam solenoid valve clogged and not
		fully closing.
	10.	Excessive load on boiler due to other equipment connected to
		steam line (outlet from boiler).
	11.	A heavy build-up of scalants has coated the interior of the
		boiler, creating an insulating effect.

Page 43 of 48 F25154 (February 2004)