NOTE: Be sure valve 2 or 3 on the pump unit control panel is open.
STARTING THE M2 WATER HEATER
After the proper hose and electrical cable connections are made, you are ready to start the M2 water
heater. As noted in Lesson 1, a variety of fuels is suitable for use in the M2 water heater. These fuels
and the proper operating pressures for each are summarized in Figure 34.
Figure 34. M2 water heater fuels and pressures.
Keep clear of the exhaust stack during operation of the M2 water heater.
A chemical-protective mask does not protect against carbon-monoxide
To prevent damage to the M2 water heater, operate the pump unit for two
minutes with the HEATER-ON/PURGE-ON switch in the PURGE-ON
position before igniting the boiler. This ensures that the boiler is filled
with water and that all air is out of the lines.
NOTE: An operator must be in attendance at all times during operation of the M2 water heater.
Note: Insure that the water pressure reading on the M2 water pressure gauge is at 60-155 PSI. You
must meet this water pressure requirement prior to turning the water receptacle switch to the ON
To start the M2 water heater, use the following procedures.
Step 1. Prime the pump. Start the pump unit according to the procedures described in Lesson 2,
Learning Event 1.
Step 2. Ensure the HEATER-ON/PURGE-ON switch is in the PURGE-ON position. Place the
voltage regulator switch in the ON position. With the HEATER-ON/PURGE-ON switch in the
PURGE-ON position, operate in this position for at least two minutes.