Step 5. Disconnect the fuel supply and the fuel return lines of the fuel hose from the M2 water heater.
Install the caps. Disconnect the fuel hose from the gasoline can. Drain the fuel hose and stow it in the
storage compartment of the M2 water heater. Install a cap on the gasoline can.
Let the water heater cool before disconnecting fuel lines. If it is necessary
to disconnect the hoses with the water temperature above 100 degrees
Fahrenheit, exercise extreme care to prevent scalding.
Step 6. Stop the pump unit assembly by reducing the engine speed to idle closing the fuel shut-of valve,
and turning the start-magneto switch to the OFF position. Close all opened valves for operation.
Step 7. Disconnect the blender hose from the heater base and make the appropriate connection for the
next operation. Allow the water heater to drain. It will drain completely through the water inlet.
Step 8. Install the protective cap on the heater inlet.
Step 9. Coil the hose neatly in the storage compartment.
Step 10. Close and latch the storage compartment door.
Learning Event 2
HEAT WATER FROM A NATURAL WATER SOURCE
For some uses of the M12A1 PDDA, heating water from a natural water source with the M2 water
heater and then dispersing the heated water for the required application is the more feasible option. This
is often the case in providing showers for personnel. When heated water is provided in this manner, the
water delivered should be at a temperature of 100 degrees Fahrenheit (38 degrees Centigrade).
MAKE CONNECTIONS FOR PUMPING WATER FROM A NATURAL WATER SOURCE
If the tank cannot be filled prior to heating water, it can be heated by pumping it directly through the
heater. To pump the water for this purpose, perform the following steps.
Step 1. Position the PDDA so that the vertical distance from the water source to the pump is 15 feet or
Step 2. Connect the suction hose to the foot valve assembly. Connect the free end of the suction hose to
the suction connection on the pump.