750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
3-5
3.3 — Water Requirements: Steam Boiler
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.
3.3 — Water Requirements: Steam Boiler
3.3.1 — Feed Pump Operation
BEFORE turning on the pump motor be certain that all valves in the water feed line are open to prevent possible
damage to the feed pump mechanism. After opening the valves, momentarily energize the feed pump motor to
establish correct pump rotation. With the correct rotation established, close the boiler feed pump entrance switch.
The pump should shut down when the water level reaches the proper level (see Figure 3-3).
FIGURE 3-3. Low Water Cutoff Sight Gauge
Feedwater pumps must have adequate capacity to maintain required water level under all operating conditions.
Check the feedwater pumps periodically and maintain as necessary to prevent unexpected breakdowns.
NOTE: Prior to operating the pump, carefully check the alignment of the flexible coupling, if one is used. A properly
aligned coupling will last a long time and provide trouble-free mechanical operation.
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