The next split-legend indicator (E) labeled
PUMP SUCTION OPEN/PUMP SUCTION
CLOSED is for the pump suction valves (one per
pump). It illuminates to indicate the actual
position of the valve. These valves are electrically
interlocked with the pump start/stop push
buttons to ensure the valves are open before the
pump starts.
Three push buttons and a control mode switch
control the two service pumps. The three push
buttons are labeled LOW SPEED (F), HIGH
SPEED (G), and STOP (H). They will illuminate
to indicate the actual status of the pump. The
pump (1 or 2) CONTROL MODE switch (I) is
used to set the pumps in the MAN (manual) mode
or the AUTO SPEED ADVANCE mode. Each
pump is a two-speed pump. In the manual mode
the operator selects the speed of the pump (low
or high) by depressing the proper push button.
In the automatic mode, a drop in fuel pressure
will shift the pump from low to high. If low speed
is again desired, the operator must shift the speed
back to low. The pump discharge valve indicator
(J) is labeled PUMP DISCH OPEN/PUMP
DISCH CLOSED. The valve is equipped with a
limit switch to send a signal to the PCC which
will illuminate the indicator to show the actual
position of the valve. This valve is operated
manually at the valve.
The HEATER DISCHARGE TEMP HIGH/
LOW alarm (K) is a split-legend indicator alarm
for high or low temperature. If the temperature
of the fuel leaving the heater exceeds 110F, the
high indicator illuminates and an alarm sounds.
Likewise, if the temperature drops below 60F,
the low indicator illuminates and an alarm sounds.
A fuel prefilter is used in the system to remove
large particulate matter. If its Ć P exceeds
10 psid, the PREFILTER STRAINER HIGH Ć P
indicator (L) illuminates and an alarm sounds. A
second filter, called the FILTER/SEPARATOR,
is used to separate smaller particles and water. If
this becomes clogged and the DP is 12 psid or
higher, the FILTER/SEPARATOR HIGH Ć P
Figure 6-8.--Fuel oil service system panel.
indicator (M) illuminates and an alarm sounds.
Gear Lube Oil Panel
shows the actual status of both valves. Both
valves must be in the same position for
The gear LO panel (fig. 6-9) is used to
this indicator to illuminate. These valves
control and monitor the flow of LO to the MRG.
determine the tank that is supplying fuel to
The first indicator (A) is labeled SUPPLY
the fuel pump and where the excess fuel is
HIGH TEMP and illuminates if the MRG LO
returned. The valves are operated by the
temperature exceeds 130F. If the MRG
split-legend, push-button indicator (D) labeled
hydraulically most remote bearing pressure drops
OPEN/CLOSE. It will illuminate to show the
to 9 psig, the indicator (B) labeled REMOTE
operator's command to the valves.
6-16
