If the pump unit assembly and the M2 water heater are operated in an
enclosed area, the exhausts must be vented or placed outside the enclosed
area to prevent carbon-monoxide poisoning. Keep clear of the exhaust
stack during operation of the M2 water heater. A chemical-protective
mask does not protect against carbon-monoxide fuses.
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. Circulate only clean water
through the M2 water heater. Do NOT circulate slurry or any other
mixtures through the M2 water heater.
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 us at 60-155 PSI. You
must meet this water pressure requirement prior to turning the water receptacle switch to the ON
Start the M2 Water Heater
Start the M2 water heater by performing the following steps.
Step 1. Ensure the HEATER-ON/PURGE-ON switch is in the PURGE-ON position.
Step 2. Turn the voltage regulator switch to the ON position. Allow the pump unit and M2 water heater
to operate in this mode for two minutes.
Step 3. Place the HEATER-ON/PURGE-ON switch in the HEATER-ON position. Adjust the
temperature selector control to product an indication on the fuel pressure gage for the type of fuel being
If the M2 water heater does NOT ignite in 10 seconds, set the HEATER-
ON/PURGE-ON switch to PURGE-ON. Do NOT try to restart the M2
water heater. Place the voltage regulator switch to OFF. Disconnect the
main electrical power cable.
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