Step 4. Run the M2 water heater for about five minutes. Then readjust the temperature selector control
slowly to set the desired water temperature. Do NOT allow the temperature of water in the boiler to
exceed 200 degrees Fahrenheit (plus or minus 12 degrees). If it does, the heater will shut itself off.
Step 5. Water may be discharged through the gun assemblies or through the shower by opening either
valve 2 or 3 while water is being heated. Also when the heater is in operation, fresh water may be
continuously added to the tank from a hydrant or hose. Valve no. 1 can control the temperature of water
by metering the water flow through the heater. Do not allow the pump pressure to fall below 60 psi.
Stop the M2 Water Heater
When the operation is finished, stop the apparatus using the following steps.
Step 1. Set the HEATER-ON/PURGE-ON switch to PURGE-ON. After combustion stops, run for two
minutes on PURGE-ON.
Step 2. Set the voltage regulator switch to the off position.
Step 3. Continue to cycle water through the boiler for at least three minutes, or until the water
temperature is approximately 100 degrees Fahrenheit, as shown on the water temperature gage.
Ensure that the water heater is cool before storing the main electrical
power cable and fuel hoses in the storage compartment.
Step 4. Place the heater receptacle and switch in the off position. Disconnect the main electrical power
cable. Install the cap over the socket receptacle. Stow the main electrical power cable in the storage
compartment of the M2 water heater.
Step 5. Disconnect the fuel supply and the fuel return lines of the fuel hose from the M2 water heater.
Put on the caps. Disconnect the fuel hose from the gasoline can. Drain the fuel hose and stow it in the
storage compartment. Put the cap on the gasoline can.
Step 6. Stop the pump unit assembly by slowing the engine speed to idle, closing the fuel shut-off valve,
and turning the start-magneto switch to OFF.