Instruction d'utilisation Chromalox PQ402-6

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SERVICE MANUAL 4 CES
(Supersedes PQ402-5) PQ402-6
161-049460-001
FEBRUARY, 1999
Chromalox Electric
Steam Boilers
The troubleshooting of Chromalox electric boilers can best be of the Installation and Operating Instructions for
placed into five major areas. These areas are: (1) fusing (2) con- your specific Chromalox Electric Steam Boiler.
tacts, elements and voltages (3) pressure control (4) low water cut-
For convenience, we have outlined a brief description of typical
off (5) water feed mechani

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5. Water softener is being used without an aeration device. Boiler syphons water: Motor runs too frequently and/or the boiler does not maintain pressure: 1. Follow blowdown instructions. 1. Test check valve. Boiler with condensate system floods overnight: Motor runs continuously, but does not pump (CMB-10L 1. Vacuum breaker is not operating. to CES-30): Elements fail: 1. Test flexible coupling on motor and pump. 2. Check water supply. 1. Low Water Cut-Off system has failed. 3. Blowdown valve par

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CONTACTOR FAILS TO ENERGIZE If the contactor fails to energize, check for blown fuses in the control circuit. If the fuses are not blown, check the contac- tor holding coil. The holding coil can be checked by jumpering Terminal L1 of the line and Terminal No. 4 (coil lead) on the contactor. See Figure 1. A. If the contactor fails to energize, then the coil is defective. B. If the contactor energizes, it is an indication of failure in either the Pressure Control or in the McDonnell-Miller three w

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LOW WATER CUT-OFF — Like the pressure control, difficul- assure that it is properly seated. If the valve seat is scarred or ties can be broken down into the mechanical and electrical defective, the entire valve seat must be replaced. Also, if the float groups. valve is in the down or “off” position, it may be punctured or encrusted with dirt and the unit must be disassembled. The mechanical difficulties can be corrected on the high pres- sure 100 psig motor and pump units in the following manner