TM 10-5410-228-24
Placing the control switches in the positions corresponding to the above modes opens solenoid valves SV1
and SV5, and closes SV7, SV9, and valve PD1 by applying +24 Vdc to the coils. The same conditions exist in
this configuration as exist in the Mobile Mode, vent mode (figure 1-21) except that solenoid valve SV5 is
energized (open) and solenoid valve SV7 is energized (closed). This blocks flow from returning to the
reservoir and forces the fluid over the heating system relief valve, RD2. The hydraulic fluid pressure at this
point is approximately 2,600 psig. As the fluid passes over the relief valve from the high pressure side to the
low pressure side, heat is generated in the fluid since no effective work is performed. The hot fluid then flows
through the heating coil, HX-1A, where air flowing across the coil picks up heat from the hot hydraulic fluid
to warm the interior of the CBPS. After the fluid passes through the heating coil, it is routed to the oil cooler,
filter, and reservoir which is the same as the vent mode.
Valve
SV1
SV2
SV4
SV5
SV6
SV7
SV8
SV9
Energized State
ON
OFF
OFF
ON
OFF
ON
OFF
ON
Position
Open
Closed
Closed
Open
Closed
Closed
Closed
Closed
Figure 1-24. Mobile Mode, Internal Power, Heat Mode, Full NBC
