TM 10-5410-228-24
Placing the control switches in the positions corresponding to the above modes opens solenoid valves SV2,
SV5, and SV6 and closes SV7, SV9, and valve PD1 by applying +24 Vdc to the coils. Operation of the
hydraulic circuit is the same as the heat 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
PF2 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
OFF
ON
ON
ON
OFF
ON
Position
Closed
Open
Closed
Open
Open
Closed
Closed
Closed
Figure 1-18. Static Mode, Internal Power, Heat Mode, NBC Off
