Lesson 2/Learning Event 3
LEARNING EVENT 3:
DESCRIBE OPERATOR CHECKS AND
SERVICES REQUIRED FOR THE M2 WATER HEATER
In this learning event we will discuss the procedures
necessary to perform before-, during-, and after-operation services to the
The M12A1 PDDA unit must be in operation.
Use the following steps to perform before-operation services on the M2 Water
Step 1. Remove the side quick-release panels. Inspect for loose or missing
hardware. Where necessary, tighten hardware or connections. See that the
wiring or other objects do not obstruct any moving parts. Check for obvious
damage to the boiler.
Do NOT replace the side panels until after establishing water
circulation through the boiler and operating the heater control
switch in the PURGE-ON mode in order to check for water and fuel
leaks with the system pressurized.
Step 2. Check that the controls and instruments are in good condition. Set
the heater control switch to PURGE-ON.
See that the gages work and are
At START UP only, 60 - 75 psi, depending on
During operation, it may be lower or higher.
Water Heater uses multifuel.
The fuel pressure for the different
fuels are gasoline - 75 psi, JP-4 fuel - 75 psi, kerosene - 70 psi,
and diesel fuel- 60 psi.