Waterside Care
3-4
750-368
CBEX Elite 100-1200 HP
Pump Operation
Pumps are normally started and stopped by manual switches. It is also desirable to interlock the pump with the
burner so that the burner cannot operate unless the circulating pump is running.
Pressure
The design of the system and usage requirements often dictate the pressure exerted upon the boiler. Some sys-
tems are pressurized with air, or with an inert gas such as nitrogen. Caution must be exercised to ensure that the
proper relationship of pressure-to-temperature exists within the boiler so that all of the boiler’s internal surfaces
are fully wetted at all times. For this reason, the internal boiler pressure, as indicated on the water pressure
gauge, must be held to the level shown in the Internal Boiler Pressure graph below.
FIGURE 3-3. Internal Boiler Pressure
When initially firing a newly installed boiler, or when cutting an existing boiler into an operating system, the
boiler or boilers to be cut into operation MUST be pressurized equal to the system and/or other boilers prior to
opening the header valves.
It is advisable to have a thermometer installed in the return line to indicate return water temperature. Knowing
the supply water temperature, the boiler system differential can be established. With knowledge of the pumping
rate, the operator can easily detect any excessive load condition and take appropriate corrective action.
Special caution must be taken to guard against any condition, or combination of conditions, that might lead to
the transfer of cold water to a hot boiler or hot water to a cold boiler. It cannot be over-emphasized that rapid
changes in temperature within the boiler can, and sometimes do, cause damage.
3.2.2 — Steam Boilers
Feed Pump Operation
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