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Profire EV/LNEV Burner
rear legs is all that is needed to obtain lateral adjustment. Rear
legs may require shimming for vertical correction.
Tighten the hold-down bolts after adjustments are made and
recheck the alignment.
Calipers can also be used to check angular alignment.
Measure the overall distance of the outer ends of the coupling
halves at 90º intervals. Shift the pump or motor, as required,
so that the ends of the coupling are the same distance apart at
all points. The coupling will then have proper angular
alignment.
Remember that alignment in one direction may alter
alignment in another. Re-check both angular and parallel
alignment procedures after making any alteration.
A properly aligned coupling will last longer and will provide
trouble-free mechanical operation.
Air Compressor Replacement
Use the following procedures when replacing the pump. Be
sure to tag the motor leads if disconnected to simplify re-
connection.
Dismantling:
1.
Lift out the two front cylinder pins that hold the screen, and
remove the screen.
2.
Disconnect the flared nut on tubing "A" (behind screen) and
lift tubing "A" high enough to prevent drainage of lubricating
oil from the tank.
3.
Disconnect the flared nut at the orifice fitting.
4.
Remove the two sheet metal screws that hold the cylinder in
place. One screw is located at the top rear of the cylinder, the
other is at the bottom front.
5.
Remove the entire heat exchange assembly, consisting of the
cylinder, the finned tubing, and the oil line "B".
6.
Remove the fan from the air pump.
7.
disconnect the flexible air line from the lube tank.
8.
Remove the coupling guard by pushing in on both sides until it
clears the clamp.
9.
Loosen the clamp at the rear of the tank and remove the tank
with copper tubing "B" attached.
10. Leave the rear pump bracket (coupling end) in place to aid in
realignment of the replacement pump. Do this by removing the
two capscrews that extend through the bracket into the pump
housing. Temporarily leave the front bracket attached to the
pump.
11. Remove screws holding the front bracket to the base and lift
off the pump with its attachments. Note the location of the
pipe fittings and brackets prior to removing for installation on
the replacement pump. If piping is dismantled, be sure that the
check valve is re-installed so that the gate swings toward the
pump.
Reassembly:
Reassemble in reverse order. With the rear pump bracket left
in place, realignment and spacing between the pump shaft
and the motor shaft is greatly simplified.
750-364
There should be approximately 7/8" space between the two
shafts. Place the coupling insert between the coupling halves
prior to reassembly. Check that both shafts rotate freely.
Refer to the previous section on coupling alignment
instructions.
If shims were used originally under either pump brackets or
motor feet, be sure that they are correctly re-installed.
When re-installing the fan, slide the hub on the pump shaft so
that it is bottomed. Tighten the setscrew and capscrews. If the
fan blades were removed from the hub, be sure that the side
of the blade marked "Blower" faces the hub when
reassembling. When tightening the coupling halves or the fan
hub, tighten the setscrews against the key first, then tighten
the setscrew against the shaft. Clean or remove any dust or
grime from the blades prior to re-installing.
When replacing the retainer screen, a slight force may be
required to push the cooling coil into the air cylinder so that
the pins may be fitted into place.
Be sure that all piping connections are tight.
If the mot or was replaced or if m otor leads were
disconnected, be sure that pump rotation is proper before
starting operation. The air pump should rotate in a clockwise
direction, as viewed from the drive shaft end.
Keep the motor and other components free from dust and dirt
to prevent overheating and damage. Motor lubrication should
follow manufacturer's recommendations.
GAS SYSTEM
Caution
!
All power must be disconnected before servicing
the valves.
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 the valve fails to
operate. After replacement, cycle the valve with the fuel
shutoff to determine that it opens and closes. If the valve has
a visual indicator, observe its position for correct operation.
Solenoid Valves
A slight 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 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.
Chapter 2
2-11
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