Fulton Hopkins (HPN) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 39)

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SECTION 3
HPN-IOM-2014-0416
OPERATION
3-7
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
4
CAUTION
Do not use this equipment if any part
has been under water (or subjected to
heavy rains/water if the equipment
does not have NEMA 4 wiring, controls
and instrumentation). Immediately
call a qualifi ed service technician to
inspect the equipment and to replace
any part of the control system and/or
gas control(s) which have been under
water.
A temperature exceeding 120°F** in
the boiler room may cause premature
failure of electrical components.
Provisions should be made to maintain
an ambient temperature of 120°F**
or less (the panel box interior should
not exceed 125°F**). **Pumps, PLC or
ModSync panels may require lower
ambient temperatures or additional
cooling.
5. Check pump rotation. Operating the pump in reverse rotation may cause
extensive damage.
6. Turn the three position switch located on the front of the panel box door
to “Pump”.
7. Jog the green pump motor starting button and observe the direction of
rotation. Rotation should be in the direction of the arrow shown on pump
casing. If the rotation direction is incorrect, turn the three position switch
back to “Off ” immediately. Change the wiring connections and recheck.
8. Check for proper alignment. Realign, at temperature.
9. With the control switch set to “Pump” push and hold the pump start
button, check all manual resets on pressuretrols. The circulating pump will
run, but the burner will not fi re.
10. If the pump stops when the button is released, check for proper fl ow in the
system, and review settings of high and low fl uid pressure switches and
diff erential pressure switch. Check liquid level switch.
11. Check that all pressure gauge readings remain stable. Refer to Figure
16. Pressure exceeding 100 PSIG or identical readings at inlet and outlet
gauges indicate a closed valve.
12. If an extremely high vacuum (i.e.15” Hg or more) is indicated on the
compound gauge, the valve between the circulating pump and the
combination tank may have been left closed. In this case, little or no
pressure will be indicated by other gauges.
13. Check all piping, connections and users for leaks. Repair any leaks
immediately.
Filtering the System
1. Initially, readings on the gauge will indicate zero or slightly positive
pressure. During the fi rst few moments of fl ow, this reading will go towards
vacuum, indicating that the strainer is becoming plugged.
2. Typically, a reading of 3” Hg or greater vacuum on the pump suction gauge
indicates that the strainer must be cleaned. The strainer screen should be
back fl ushed or pulled, cleaned and replaced.
3. In some cases, a positive pressure can be measured at the pump suction
gauge (due to the use of a nitrogen blanket or large positive head). This
should be noted and if the reading decreases by several inches or pressure,
check the strainer to ensure it clean.
4. Strainers should be cleaned by means of compressed air. A rag will merely
force the smaller particles into the mesh of the strainer. It is recommended
to place a lint free rag in the center of the strainer and blow air from the
outside, trapping the debris in the rag.
5. Allow the pump to run again for several minutes and repeat the fi ltering
process until pump suction pressure remains steady after cleaning. The