TM 10-5410-228-24
1.16 HYDRAULIC SYSTEM Continued.
Placing the control switches in position corresponding to the above modes opens solenoid valves SV2, SV4,
and SV6 and closes solenoid valve SV9 and valve PD1 by applying +24 Vdc to the coils. Operation of the
hydraulic circuit is the same as the cool mode except that solenoid valve SV6 is energized (open). This allows
some portion of the total hydraulic fluid flow to bypass the NBC fan motor, M3. Flow control valve FP2 is
used to regulate the flow and hence the speed of the NBC fan motor whenever the control switches are in the
non-NBC mode. All other functions are as previously described.
Valve
SV1
SV2
SV4
SV5
SV6
SV7
SV8
SV9
Energized State
OFF
ON
ON
OFF
ON
OFF
OFF
ON
Position
Closed
Open
Open
Closed
Open
Open
Closed
Closed
Figure 1-29. Static Mode, External Power, Cool Mode, NBC Off