Fulton Hopkins (HPN) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 53)

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SECTION 3
HPN-IOM-2014-0416
OPERATION
3-21
!
WARNING
Do not operate, or allow others
to operate, service or repair this
equipment unless you (they) fully
understand all applicable sections
of this manual and are qualifi ed to
operate/maintain the equipment.
Non-Fulton product information is for
reference purposes only. No Fulton
document may substitute for full
review of documentation available
from the component manufacturer.
3. Repeat for each switch; replace covers. Note, if the burner was on, it would
also stop.
4. To set the low fl uid pressure cutout switch, raise the setpoint with the fl uid at
operating temperature and pump running, until the pump shuts down. Note
the setpoint and lower by 10 PSI, then re-start pump. The setpoint at cutout
should correspond to the reading on the output pressure gauge.
5. With the unit cold and pump running, lower the high fl uid pressure cutout
switch until the pump shuts down. Note the setpoint and raise by 10 PSI, then
re-start pump. The setpoint at cutout should correspond to the inlet gauge
reading.
 Gas Pressure Switch
NOTE:

Gas Fired Units Only
The high and low gas pressure switches are located on the gas train. See Figure
14. The switches are used to ensure that the incoming gas pressure and gas
pressure to the burner are within the appropriate range.
1. While fi ring, shut the main gas ball valve.
2. Unit will lock out on high gas pressure.
3. Attempt restart by resetting fl ame programmer.
4. Unit will start purge and lock out.
5. Open the gas valve closest to the burner and reset fl ame programmer.
6. Reset high side of switch, unit will start purge and fi re.
7. To test the low gas pressure switch, close the incoming manual valve.
8. Allow the control to sequence.
9. When the gas valves energize, the heater should lock out.
FIGURE 13 - PRESSURE SWITCHES