Manufacturing / Industrial • Maintenance

Cleaver Brooks Electric Boiler - CR 750-137 Quarterly Maintenance

MaintainX

04/26/2021

Cleaver Brooks Electric Boiler - CR 750-137 Quarterly Maintenance

Warning: Lockout and disconnect the main power before tightening the main supply lugs in order to avoid the hazard of electrical shock, which could result in serious personal injury or death.

Tighten the main supply lugs every 24 hours during the first week of operation.

While the boiler is operating, lower the pressure setting drastically on the control pressure and listen for the magnetic contactors to open. Then return the setting to normal and again listen for the magnetic contactors to close.

Turn off the control pilot switch and the main power supply switch. This is a safety measure to prevent accidental turn-on of power

Tighten all the electrical connections that could have loosened due to heat expansion and contraction. Pay particular attention to the main lugs that receive the power circuit.

Examine all the relays and the magnetic contactors for pitting, corrosion, burned or welded contacts, or inoperative 120-volt coils.

INspect for blown fuses or discoloration of fuse clips, which would indicate a loose fit. Correct malfunctions as required.

If the boiler was supplied with a probe-type auxiliary low water cutoff, remove the low water cutoff probe from the vessel, clean the probe, and reinstall it.

Caution: When checking the element terminal connections, use a wrench on both nuts to avoid twisting the terminal stud and damaging the equipment.

If all elements have been operating normally and each element bank draws its rated current or amperage, where no further element tests are necessary.

However, if there is a low or unbalanced amp reading, further tests with an ohmmeter may be necessary to detect the open or shorted elements in the group.

To test individual elements for continuity with an ohmmeter, the jumpers between elements must first be removed.

Source: Cleaver Brooks