defects discovered during operation of the unit will be
noted, and corrections made as soon as operation has
ceased. Stop the operation immediately if a deficiency
is noted that could damage the equipment. After
operation, the necessary PMCS must be performed.
Report defects or unsatisfactory operating
characteristics beyond your scope to your supervisor.
Be certain the water heater drain cock is closed.
Check to be sure the smoke-pipe elbow, the two
lengths of the smoke-pipe guard assembly, and the
smoke pipe are securely installed.
The PMCS procedures are contained in the
operating manual provided with the field unit.
Preparation for Use
After having performed the recommended PMCS
and the water heater is ready for use, you should
proceed as follows:
Before you start the bath unit, go to the Operators
Preventive Maintenance Checks and Services
(PMCS) and do the Before Operation checks and
then proceed as follows:
Make certain the water heater load limit switch
is turned to OFF.
Turn off the limit switch and connect the power
cable to the power source. Close the fuel valve by
turning it to the right.
Remove the plug and fill the coupling with
Replace the plug.
Make sure the manual fuel valve is closed.
Press the reset button to ensure the flame
safeguard control is not locked out.
Open the fuel valve and turn the load limit
switch and power source ON. The fuel pressure gauge
should indicate 100 psi.
Open the blower shutter approximately halfway.
View the ignition spark through the sight tube
after the power is turned ON.
Open the fuel pump primer plug and fill the fuel
container with the fuel mixture. Replace the plug.
Make sure that one end of the hose is connected to
the supply fitting of the fuel filter and to the fittings on the
vent. Connect the return fuel line to the drum fill adapter.
The operator must periodically monitor the
level of the fuel supply. The fuel container
should be kept as full as possible to reduce wa-
ter condensation. The frequency of refueling
depends on the size of the fuel container. Ex-
cessive water in the fuel supply decreases
heater efficiency and corrodes both chamber
and the burner.
Exposed fuel and fuel vapor can ignite or
explode, resulting in possible serious injury
and even death. Observe proper safety precau-
tions when servicing the fuel system. Ensure
the water heater is cold before servicing the
Check to see that all water lines are connected.
Wait 7 seconds; then view the combustion
through the sight tube.
If combustion does not occur after an additional
12-second wait, the buzzer sounds and the ignition
spark shuts down. Wait 2 minutes after the buzzer
sounds and press the safety reset button. If combustion
still does not occur, troubleshoot the unit according to
After start-up, the exhaust gases from the
exhaust stack should be transparent and smokeless.
When smoke is present, open the air band on the blower
assembly slowly until the exhaust gases are transparent
and smokeless. The water heater is now in automatic
Perform the following shutdown procedures after
normal use or when the equipment will not be used for
an extended period:
Turn off the fuel valve.
Turn off the load limit switch.
Turn off the water pump.
If there is danger of the bath unit freezing, perform
the following procedures: