Évaluations - 4, GPA: 4.5
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Facilité d'utilisation
WARNING: Hazard of Electric Shock and Thermal Burns. These troubleshooting checks should only be performed by qualified personnel after review of the Installation and Operating Instructions for your specific Chromalox Electric Steam Boiler. For convenience, we have outlined a brief description of typical malfunctions and the area that should be explored in order to make the proper correction. This is followed by a detailed analysis of the five areas listed above. TYPICAL MALFUNCTIONS & PROPER CORRECTION Boiler does not heat: 1. Check power fusing. 2. Examine control circuit fuse. 3. Reset button on the Low Water Control must be depressed (for states requiring a reset button). 4. Float valve in the Low Water Control is not functioning properly. 5. Elements and/or contactors faulty. 6. Mercury tube in Low Water Control has cracked and mercury has escaped. Boiler takes too long to reach operating pressure or does not maintain desired pressure: 1. Check amperage on each supply leg of power harness. Reading should correspond to a rating of not less than 10% of rated boiler amperage. If considerable difference exists: A. Available voltage is insufficient for boiler needs. B. Heating element failure has occurred. C. Fibre carrier in contactor requires replacement. On multi contactor units, check contactors and coils to determine if one is defective. 2. Check to determine whether boiler selected is underrated for the application. 3. Additional Equipment added after initial installation, thus undersizing boiler. 4. Steam piping not insulated. Boiler continuously blows power fuses: 1. External fusing is not sized properly. Correct sizing is next size larger than boiler rating. 2. Check lines between element and contactors with an ammeter for uniform readings. 3. Check for evidence of charring which indicates loose connections. 4. A short circuit exists in the boiler. Boiler does not fill with water automatically or does not maintain constant pressure: 1. Check water supply line for closed valves. 2. Check power fusing. 3. For boiler without motor and pump assembly: check pressure of water supply to insure that it is consistently a minimum of 10 psi greater than the desired boiler operating pressure. 4. Check water inlet check valve. 5. For boiler with motor and pump assembly: check mercury tubes in the Low Water Control. 6. A. Check motor and pump for binding and over heating. If caught in time, this can be observed by a humming sound. Replace if defective. B. Check for defective solenoid valve. C. Make sure pump is running with correct rotation. D. Check impeller adjustment on turbine type pumps. Boiler appears to be leaking from beneath the jacket: 1. Check boiler fittings for looseness; tighten as required. 2. Check boiler fittings for cracks; replace as necessary. 3. Examine heating elements around boiler flange. IMPORTANT: Leaking is a hazard, correct to prevent further damage to other components. Boiler overflows: 1. Float valve on the Low Water Control is stuck in the down position. 2. Solenoid valve is not operating. 3. Check for defective mercury tube on the Low Water Control if boiler has a motor and pump assembly. Pressure increases beyond the preset limits causing safety valve to blow: 1. Check bellows in the pressure control. 2. Check for clogged syphon tube. 3. Contactor points have fused. 4. Check pressure control setting against safety valve rating. Manual reset button needs constant resetting (for states requiring reset buttons only): 1. Boiler is not level; relocate if necessary. © 2010 Chromalox, Inc. Boiler syphons water: 1. Follow blowdown instructions. Boiler with condensate system floods overnight: 1. Vacuum breaker is not operating. Elements fail: 1. Low Water Cut-Off system has failed. 2. Lower equalizer tube on Low Water Cut-Off is clogged due to lack of blowdown. 3. Contactor points have fused. 4. Lack of blowdown has allowed accumulation of foreign material, which has smothered the heating elements. 5. Water softener is being used without an aeration device. Motor runs too frequently and/or the boiler does not maintain pressure: 1. Test check valve. Motor runs continuously, but does not pump (CMB-10L to CES-30): 1. Test flexible coupling on motor and pump. 2. Check water supply. 3. Blowdown valve partially open. DETAILED ANALYSIS FUSING — The power fuses should be the first component of equipment checked in any power failure. The fuses will be located in a panel near the boiler (or within the boiler on 72kW and larger models). Test each fuse with a test light or an ohmmeter. If the test light glows or the ohmmeter reads infinite resistance, then the fuse is defective and must be replaced. Fuses can be intermittent. If all other boiler components appear to be in proper order, replace all fuses with known good ones. If a circuit breaker is used instead of fuses, check to see if all breakers are in the “on” position. Reset if necessary. If the fuses continue to blow or the circuit breakers co...