Step 3. Place the HEATER-ON/PURGE-ON switch in the HEATER-ON position. Quickly adjust the
temperature selector control to produce an indication on the fuel pressure gage for the type of fuel being
burned, as indicated in Figure 34.
WARNING
If the M2 water heater does not ignite in 10 seconds, place the HEATER-
ON/PURGE-ON switch in the PURGE-ON position. Do NOT attempt to
restart the M2 water heater. Place the voltage regulator switch in the OFF
position and remove the electrical power cable. Notify organizational
maintenance personnel.
Step 4. Operate the M2 water heater for approximately five minutes. Then readjust the temperature
selector control gradually to produce 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 automatically shut off.
STOPPING THE M2 WATER HEATER
When the water in the tank has been heated to the desired temperature, you will need to stop the M2
water heater using the following steps.
Step 1. Place the HEATER-ON/PURGE-ON switch to the PURGE-ON position. After combustion
ceases, operate for two minutes on PURGE-ON.
Step 2. Place voltage regulator switch in 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 indicated on the water temperature gage.
CAUTION
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.
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