Chapter 5 — Starting and Operating Instructions
Part No. 750-184 5-3
for the CB-LE, when viewed from the front of the boiler (see Figure
5-1). The air pump rotation is clockwise when viewed from its
drive end. When operating a standard 60” boiler the fan motor and
air pump should rotate clockwise when viewed from the front of
the boiler (see Figure 5-3).
Before operating the boiler feed pump or oil supply pump, be sure
all valves in the line are open or properly positioned.
For safety reasons, perform a final pre-startup inspection, especially
checking for any loose or incomplete piping or wiring or any other
situations that might present a hazard.
Note: The pressure vessel support legs are welded to mounting skids in
front and secured by bolts at the rear of the pressure vessel. The
bolts are tightened for shipment. When the boiler is installed, and
prior to initial firing, the bolts securing the rear legs to the skid must
be loosened to allow for expansion and contraction caused by
differences in temperature between pressure vessel and skids and
to avoid damage to the equipment.
B. CONTROL SETTINGS - STEAM AND HOT WATER
See Chapter 6 for adjustment instructions for the following controls.
Inspect the Operating Limit Control for proper setting.
1. The operating limit pressure control of a steam boiler should be
set slightly above the highest desired steam pressure, but at
least 10% lower than the setting of the safety valve.
2. The operating limit temperature control on a hot water boiler
should be set slightly above the highest desired water tempera-
ture and within the limits of the pressure vessel.
Inspect the High Limit Control for proper setting.
1. On a high pressure steam boiler, the high limit pressure control
should be set approximately 10 psig above the operating limit
pressure control setting, if feasible, or midway between the oper-
ating limit pressure and the safety valve setting. The setting on a
low pressure steam boiler may be 2 or 3 psig above the operat-
ing limit setting, but must not exceed the safety valve setting.
2. On a hot water boiler, the high limit temperature control should
be 5-10°F above the operating limit temperature control setting
but within the limits of the design pressure of the pressure ves-
sel.
Inspect the Modulating Control for proper setting. The control must
be set and adjusted so that the modulating motor returns to low fire
position before the operating limit control opens. It is further
desirable to have its low point setting somewhat below the cut-in
setting of the limit control so that the burner operates in low fire
position for a brief period on each start rather than immediately
driving to a high fire position.
Figure 5-1 Fan Motor CB-LE
FAN MOTOR ROTATION COUNTERCLOCKWISE
Figure 5-2 Air Compressor CB-LE
(CB Option)
AIR COMPRESSOR ROTATION
CLOCKWISE FROM DRIVE END
Figure 5-3 Fan Motor and Air
Pump, Model CB (clockwise
rotation)
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