Chapter 2 Profire V Burner
2-32 750-177
MOTORS
Supply voltage to the motor must not vary more than 10%
from data plate ratings. At initial startup and regularly
thereafter, check the motor current with an ammeter while the
burner is in high-fire position. If the reading exceeds the data
plate rating plus service factor, determine the cause and
correct it. In dusty locations, clean the motor regularly to
assure adequate cooling. Lubricate in accordance with the
manufacturer’s instructions.
GAS SYSTEM
Check the gas train for leaks. Check the gas valves and verify
the ow and high gas pressure settings.
SOLENOID VALVES
A faint hum from the solenoid is normal when the coil is
energized. Should the valve fail to operate, check that there is
voltage at the valve coil. If there is no voltage at the coil,
check for loose wiring connections. If there is proper voltage
at the valve coil and the valve still fails to open, replace the
coil. Refer to manufacturer’s bulletin for correct procedure in
coil replacement.
Should it become necessary to replace the complete valve, be
sure that the flow is in the direction of the arrow on the valve
body.
Test for gas leaks and check valve action several times to
ensure proper operation before attempting to relight burner.
MOTORIZED MAIN GAS VALVES
Should the valve fail to operate, check for voltage at the
valve. Make certain that the main shutoff cock is closed prior
to testing. The actuator is not field repairable nor should it be
disassembled. Replace the actuator if valve fails to operate.
After replacement, cycle the valve with the fuel shut off to
determine that it opens and closes. If the valve has a visual
indicator, observe its position for correct operation.
OIL SYSTEM
Little maintenance is required on the oil systems other than
cleaning the oil filter. This procedure should be done at
regular intervals. Increased inlet vacuum reading may
indicate a clogged filter. Follow the strainer manufacturer’s
maintenance schedule.
ALL POWER MUST BE DISCONNECTED
BEFORE SERVICING VALVES.
!
DANGER
CAUTION
Maintenance checks on the flexible coupling between the fuel
unit and motor for alignment, tightness and wear and oil
piping connection tightness should also be made at regular
intervals. Access the coupling by removing the airbox cover
and loosening the two setscrews on the flex coupling.
The oil nozzle should be checked. Inside the nozzle lies a
small screen that keeps out any particle not caught by the
strainer. These particles will interfere with the normal oil
flow pattern exiting the nozzle. A distorted flame can indicate
a clogged nozzle. Inspect and clean the nozzle and screen. to
clean the scree, swirler, and tip, unscrew the tip from the
nozzle body. Clean nozzle parts in solvent. Never use wire or
sharp metal tools to clean the nozzle orifice. A metal tool will
distort the orifice and ruin the nozzle. Reassemble the nozzle.
The tailpiece must be screwed in with the swirler seating tight
against the tip to ensure proper atomization. Reassemble the
nozzle into the nozzle body. If a nozzle is replaced, it must be
an identical nozzle (make, size, and spray angle).
DRAWER ASSEMBLY
The drawer assembly may be removed for inspection and
service.
1. Shut off burner, place switch in “Off” position.
2. Shut off all electric power to the burner.
3. Disconnect the fuel lines from the drawer assembly
access cover.
4. After making note of where the bolts are located in rela-
tionship to the access cover slots, remove the drawer
assembly access cover bolts. Pull the drawer partially
out of the housing. Reach inside to disconnect the igni-
tion cables from the electrodes for direct spark applica-
tions. Pull the drawer assembly completely out of the
housing.
5. To reinstall the drawer assembly, insert it part way into
the housing, connect the ignition cables, if applicable,
and seat the assembly fully. Install the access cover bolts
loosely. Slide the cover to the original location, and
tighten the bolts. Reconnect the fuel lines.
IGNITION ELECTRODE, CABLE AND
PILOT
Failure to keep electrodes clean and set in the proper position
accounts for much faulty burner operation. Not only must the
gap be correct, but the electrode points must be carefully
located with respect to the nozzle. Sometimes difficulty in
securing the electrodes in their clamps can be corrected by
using light metal shims around the porcelain. Defective or
cracked porcelains require replacement to prevent short
circuiting of the spark. A gradual wearing away of the
electrode tips may require re-spacing of the points or
replacement of the electrode.
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