Fulton Alliance (FT-HC) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 73)

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SECTION 4
FTHC-IOM-2012-1001
MAINTENANCE
4-9
 Power Flame #2 Oil Burners
On units equipped with power fl ame #2 oil burners, the
following is required for the igniter and the nozzle:
1. The igniter should be removed and cleaned regularly.
2. Porcelain insulators should be kept clean and replaced
if cracked.
3. The electrode spark gap should be set at 1/8 in. to 3/16
in. tip point type or 1/16 in. Jacob’s ladder type.
4. Tension wires and clips between transformer and
electrodes should be checked for deterioration.
5. When removing or replacing oil nozzle and electrode
assembly, take care to prevent damage.
6. Remove nozzle with properly-sized wrench; do not
force.
7. Clean with a non-fl ammable solvent liquid and a brush.
8. Set nozzle fi rmly when replaced to prevent leaks.
Replace damaged nozzle immediately. Never
interchange nozzle parts; replace entire nozzle.
Troubleshooting
 Flow Circuit/ Circulating Pump(s)
The fl ow circuit is the electrical circuit that enables the
circulating pump(s). Your thermal fl uid pump(s) will remain on
until the fl ow circuit opens to disable the pump starter or the
Off / Pump / Heat switch is turned to the “Off ” position. Items
in the fl ow circuit may include paddle type fl ow switches, a
high inlet pressure switch, a low inlet pressure switch, a high
outlet pressure switch and a diff erential pressure switch.
 LOW INLET PRESSURE SWITCH
This is a normally open switch that closes with proper
heater inlet pressure. This switch is generally a mercury bulb
type switch. Mercury will rest towards the green cap of the
mercury bulb in a “made” condition.
The purpose of the Low Inlet Pressure Switch is primarily to
protect the heater from a low fl ow condition. The Low Inlet
Pressure Switch should be set at 5 psi below normal heater
inlet pressure as read at operating temperature assuming that
none of the conditions indicated in Table 10-A are true. Refer
to Table 10-A for a tripped Low Inlet Pressure Switch.
 HIGH OUTLET PRESSURE SWITCH
This is a normally closed switch that opens with excessive
heater outlet pressure. This switch is generally a mercury
bulb type switch. Mercury will rest towards the green cap in a
“made” condition.
The purpose of the High Outlet Pressure Switch is primarily to
protect the heater from building too much pressure. Typical
coil model heaters have a maximum working pressure of 150
psi with 100 psi safety valve(s) on the heater outlet manifold.
The High Outlet Pressure Switch should be set at 5 psi over
the heater outlet pressure as read at ambient temperature
assuming that none of the conditions mentioned in Table
10-B are true.
Refer to Table 10-B for a tripped High Outlet Pressure Switch,
which will require the manual reset button on the switch to
be pushed.
 HIGH INLET PRESSURE SWITCH
This is a normally closed switch that opens with improper
heater inlet pressure. This switch is generally a mercury bulb
type switch. Mercury will rest towards the green cap in a
“made” condition. The purpose of the High Inlet Pressure
Switch is to protect the heater from building too high of a
pressure.
Typical coil model heaters have a maximum working
pressure of 150 psi with 100 psi safety valve(s) on the heater
outlet manifold. The High Outlet Pressure Switch should
be set at 5 psi over the heater outlet pressure as read at
ambient temperature assuming that none of the conditions
mentioned in Table 10-D are true.
 DIFFERENTIAL PRESSURE SWITCH
This is a normally open diaphragm switch that closes with a
proper heater diff erential pressure between the heater inlet
and outlet.
The purpose of the Diff erential Pressure Switch is to protect
the heater coil from too high of a temperature and to
protect the thermal fl uid from exceeding its maximum fi lm
temperature. Each heater model number has a specifi c
minimum diff erential pressure.
This pressure is the diff erence in pressure between the heater
inlet pressure gauge and the heater outlet pressure gauge.
See Table 10-E for troubleshooting.