Carlin 102CRD-99FRD-100CRD - Manual (Page 12)

Model 99FRD, 100CRD & 102CRD oil burners — Instruction manual
Carlin part number MN99102 Rev. 10/21/10
– 12 –
3. Prepare burner
(continued)
• The nozzle line heater needs power when the burner is in standby (no
call for heat from the appliance). Make sure the nozzle line heater is
powered directly from the 120 VAC HOT line, not through the appliance
operating control circuit. The nozzle line heater wiring should be shown
on the wiring diagram supplied with the appliance/burner unit.
• The nozzle line heater is supplied with an electrical disconnect harness,
allowing removal of the combustion head assembly without discon-
necting wires. Position the heater harness disconnect in the rear of
the blower housing, above the blower access cover. The wire leads to
the disconnect route through the side of the housing into the junction
box.
When fi rst starting the burner, or after the service switch has
been off for some time, the heater requires about 15 minutes
to bring the oil to operating temperature.
Figure 14 One-line fuel system
One-line fuel system requirements
See Figure 14. The standard burner fuel unit is a single-stage, 3450-RPM
oil pump. Apply this fuel unit only on one-line systems where the fuel sup-
ply is on the same level with, or higher than, the burner. This ensures oil
fl ow by gravity. Also make sure the total lift does not exceed 8 feet (height
difference from bottom of oil tank to fuel unit). For other conditions, you
must provide a two-line fuel system. You may also have to change the fuel
unit to a two-stage type.
Inspect/install fuel supply
Inspect the oil supply system. Ensure that the fuel lines are
correctly sized and installed and that the fuel fl ow is unob-
structed, the oil tank is clean and only # 1 or # 2 heating oil
are supplied. Failure to supply a reliable oil fl ow could result
in loss of heat and potential severe equipment damage.
Nozzle line heater
• Oil burners often operate in spaces where temperatures tend to be
cool, typically 60°F or lower. Cool oil has higher viscosity, which can
affect atomization, ignition, combustion and fuel consumption. The
nozzle line heater avoids this problem by heating the nozzle line oil to
between 120°F and 130°F, resulting in smoother ignition and improved
combustion.
General guidelines:
• When installing oil lines, use continuous runs of heavy-wall copper
tubing if possible.
• Check fuel unit (oil pump) data sheet for recommended line sizing, lift
limitations and maximum length.
• Check all connections and joints to ensure they are air-tight.
• Use fl are fi ttings. Do NOT use compression fi ttings.
• Never use pipe sealing tape. Fragments can break off and plug fuel line
components.
• Install a shut-off valve at the tank and one near the burner. (Use fusible
handle design valves when possible or when required by codes.)
• Install a large capacity fuel fi lter (rated for 50 microns or less) near the
burner.
Fuel unit bypass plug
The fuel unit is shipped with its bypass plug not installed,
intended for a one-line oil system. Install the bypass plug only
if connecting to a two-line oil system. Operating with the plug
in place on a one-line system will damage the fuel unit and
could lead to oil leakage and fi re hazard.
If the fuel line or fuel supply is above burner, never exceed 3
PSIG pressure at the fuel unit inlet. Install a suitable OSV to
reduce the pressure. Operating the fuel unit with higher inlet
pressure could result in fuel unit seal damage, oil leakage
and potential fi re hazard.