(page 3 - 931)
TM 5-3895-374-24-2
FILLING HEATER WITH HEAT TRANSFER FLUID
The piping to all the system to be heated should be completed
using a good oil sealing pipe thread compound. Avoid using
pipe thread dope that has an oil base which will "wash out".
CEI recommends Escoweld 7500 Epoxy by Exxon Chemical Co.
After checking to be sure that there are no unplugged openings
left in the piping, the heater and the system may be filled with
heat transfer oil which meets the recommendations of our heat
transfer oil specifications in Section 2.
The burner should not be operated until the circulating oil
system has been filled and the air worked out of the entire system.
This can be determined by the fact that the circulating oil pump
pressure is steady at 15 p.s.i. or higher (that is, the pressure
does not drop to nearly zero and stay there for several seconds).
The heater is protected by a pump pressure switch which will shut
the burner off when pump pressure drops below 10 p.s.i.
Filling the heater can be done by putting the oil into the
expansion tank. The oil will enter the heater and system through
the small trap between heater and expansion tank.
When the oil is cold, it will flow rather slowly from the
expansion tank into the heater.
The circulating pump (but not the burner) may be turned on during
the time that oil is being put into heater. At first, as system
is filling, circulating pump pressure may be zero or very erratic,
becoming steady at 15 p.s.i. or higher after system is filled with
oil and all air is worked out.
Do not be alarmed if it takes a little while to fill the system to
the point where the pump pressure is steady.
In order to prevent overheating of the heater, it is important
that the burner not be operated during the filling process.
Use caution to assure that no water is introduced to the heating
oil system! Any moisture in the system will convert to steam when
the temperature of the system begins to rise and can cause severe
damage to equipment and injury to personnel.
