Vulcan-Hart ML-126857 Water Conditioning, Specifications, Boiler Code Descriptions, Water Supply

VHX SERIES STEAMERS - GENERAL

Boiler Code Descriptions

Vulcan-Hart incorporates redundant controls in compliance with the CSD-1 controls and safety devices for boiler construction on the high efficiency steamer models. A description of the code is listed below.

CSD-1 Construction - Redundant controls in the electrical safety circuits that, if tripped, must manually be reset after the condition causing the trip subsides. The controls provide low water level cut-off protection (LLCO), auxiliary low water level cut-off protection (Aux LLCO), and high pressure protection for the boiler. Additionally, the low water and high pressure safety circuits have individual indicator lights that will illuminate for a visual verification of the shutdown mode.

CSD-1 construction requires operator intervention in the event of a shutdown. The indicator lights show the operator which safety system was shutdown.

The desired water properties can best be achieved by using a properly maintained water treatment system.

The water level probes in the boiler use ions in the water to detect the water level. Do not use fully demineralized or de-ionized water since it is non conductive and the water level can not be detected.

The use of strainers will not remove minerals from the water.

Water supplies vary from state to state and from locations within a state. Therefore, a water treatment specialist should be consulted before the installation of any steam generating equipment.

Steamers that operate over a long period of time without the benefit of a water treatment system, which have developed a heavy scale build-up, should be cleaned before using the system.

WATER CONDITIONING

Furnishing the boiler with treated water to reduce scale formation is advised. Scale formation will reduce steam output, cause premature component failure, and shorten equipment life. Most water supplies contain scale producing minerals such as calcium and magnesium. As steam is generated, the minerals remain and dissolve into the water. As the concentration of these minerals increases past a certain point, they precipitate from the water and coat the inside of the boiler, heating elements, and water level sensors. Because of the high temperature of these surfaces, the precipitated minerals bake onto them and become very difficult to remove.

This may cause several problems:

1.Reduced heat transfer efficiency.

2.Premature heating element failures.

3.False readings from water level sensors.

These problems are common to any steam equipment manufacturer, regardless of design, but can be minimized by furnishing the boiler with treated water.

Other factors affecting steam generation are iron content, amount of chlorination and dissolved gases.

SPECIFICATIONS

Boiler Pressure

Operating - 10 to 12 psi

Maximum - 15 psi

Water Supply

The fact that a water supply is potable is no guarantee that it is suitable for steam generation. The supply connection to the steam generator should be treated water and must be within the guidelines listed below. For drain water cooling only, an untreated water supply connection should be used.

Supply connection	cold water
Supply pressure should be	20-60 psig
Hardness*	less than 60 ppm
Silica	less than 13 ppm
Total Chloride	less than 4 ppm
PH Range	7 to 8
Un-dissolved Solids	less than 5
	microns
*17.1 ppm = 1 grain of hardness

Page 5 of 48 F25154 (February 2004)