TM 10-5410-228-24
1.16 HYDRAULIC SYSTEM Continued.
Operation of the hydraulic circuit is the same as the NBC "ON" heat mode except that solenoid valves SV6
and SV9 are energized, SV6 open and SV9 closed. 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. Energizing SV9 closes the
bypass to recirculation fan motor M2.
Valve
SV1
SV2
SV4
SV5
SV6
SV7
SV8
SV9
Energized State
OFF
ON
OFF
ON
ON
ON
OFF
ON
Position
Closed
Open
Closed
Open
Open
Closed
Closed
Closed
Figure 1-33. Static Mode, External Power, Heat Mode, NBC Off
