Cleaver Brooks Model CBT 750-382 Maintenance

GENERAL

It is recommended that a boiler room log or record be maintained. Recording of daily, weekly, monthly, and yearly maintenance activities will help to obtain economical and lengthy service from the equipment.

Only trained and authorized personnel should be permitted to operate, adjust, or repair the boiler and related equipment.

The boiler room should be kept free of all material and equipment not necessary to the operation of the boiler or heating system.

Be alert to unusual noises, improper gauge readings, leaks, etc. Any leaks - fuel, water, steam, exhaust gas - should be repaired promptly and with attention to safety.

Preventive measures, such as regularly checking the tightness of connections, should be included in regular maintenance activities.

Insurance regulations and local laws normally require periodic inspection of the pressure vessel by an authorized inspector.

Inspections are usually, though not necessarily, scheduled for periods of normal boiler downtime, such as an off season. This period can be used to accomplish maintenance, replacement, or repairs that cannot easily be done at other times.

NOTE: To insure proper operation, use only Cleaver-Brooks parts for replacement.

While the inspection pertains primarily to the waterside and fireside surfaces of the pressure vessel, the inspection period provides operators with an opportunity for a detailed check of all boiler components including piping, valves, gaskets, refractory

Comprehensive cleaning, spot painting, and replacement of expendable items should be planned for and taken care of during this time.

Cleaver-Brooks recommends common replacement parts be on hand during inspection and maintenance. Please refer to the Recommended Spare Parts List In the Parts section of this manual.

BLOWDOWN

Figure 5-1 Bottom blowdown piping

Manual Blowdown Procedure

Blowdown is most effective when the boiler is under a light load, and when the water level is at the normal operating water level. Be sure the blow down piping is in proper operating condition. Waste should be piped to a point of safe discharge.

The duration of each blowdown should be determined by water analysis. A reduction of water level in the gauge glass by about 1/2” can often serve as a rough guide, but should not replace water analysis procedures.

Low Pressure Steam:

! Caution: During blowdown, do not pump the lever action valve open and closed. Equipment damage may result. Under no circumstances should a blowdown valve be left open. Never leave the boiler unattended during blowdown.

WATER COLUMN BLOWDOWN

Figure 5-2 Water column and gauge glass blowdown

FIRESIDE CLEANING PROCEDURE/DISASSEMBLY

NOTE: Do not discard the air filter. It may be cleaned and re-used. Contact Cleaver-Brooks for cleaning kits.

With the burner head assembly swung open, the burner parts and combustion chamber can be inspected.

Figure 5-3 Burner assembly open

If any adverse conditions are observed during operation or inspection, contact your authorized Cleaver-Brooks service representative.

When inspection and servicing are completed, reassemble the burner in reverse order. When re-fastening burner door:

Figure 5-4 Burner door gasket

Figure 5-5 Fastening burner door

IGNITION ELECTRODES

The ignition electrodes should be checked on an annual basis or as needed if ignition problems are encountered. Replacement should be accomplished as shown in Figure 5-6 with the electrode turned toward the burner mantle/canister after it is inserted into

Figure 5-6 Electrode setup

! Caution: The dimensions on the ignition electrodes are not easily adjustable. Bending the rods can cause damage to the insulating material. In addition, a bent electrode will have a tendency to return to its original shape when heated. If the electrodes

Figure 5-7 Electrode spacing

UV SCANNER (70-80HP)

Figure 5-8 shows the UV scanner wiring connections to the CFH control panel.

Figure 5-8 Scanner wiring

ADJUSTABLE FLAME ROD (10-60HP)

Figure 5-10 Flame rod height

Figure 5-9 Flame rod adjustment

To avoid proximity of the flame rod to the ignition electrodes, any rotational adjustments should be made on the side opposite the ignitor (exception - on larger CFH sizes this distance is not critical).

Figure 5-11 Flame Rod, distance to burner can

WATERSIDE INSPECTION/CLEANING

Waterside inspection frequency may depend upon the local jurisdiction and inspector but it is recommended that after the first year of operation, a waterside inspection take place.

Important: Clean probes are essential to proper boiler operation. Always ensure that probes remain free of debris and buildup.

Figure 5-12 Handholes

SAFETY VALVE

Figure 5-13 Safety valve