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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 mate-
rial, 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.
FUSING — The power fuses should be the first component of
equipment checked in any power failure. The fuses will be locat-
ed 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 continue
to trip off, then the internal circuits should be investigated for a
short circuit or ground.
CONTACTORS, ELEMENTS AND VOLTAGES
— The power supply voltage must be within ten percent of the
boiler voltage rating. The standard voltages are 120, 208, 240
and 480 volts; optional voltages are 190, 275, 380, 415 and 550
volts. All boilers rated at 275 volts and higher are supplied with a
separate control circuit of either 120, 208 or 240 volts.
To insure good current flow, it is important that all contacts
are mating properly. Contacts that appear burnt or charred must
be replaced.
DETAILED ANALYSIS