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3.4.22 Check all burner and heat exchanger controls and operating devices.
3.4.23 Check Blower Combustion Air Flow Switch:
1)
Shut burner power off.
2)
Disconnect both wires at the air flow switch and temporarily clip them together. Make sure that
they cannot ground against anything, since they will be powered with 110 volts during the test.
3)
Put a continuity meter across the common and normally open terminals on the air switch.
4)
Close the gas train checking cock.
5)
Start the blower motor. The meter should read electrical continuity as soon as the blower starts.
6)
Disconnect the wire which energizes the coil of the motor relay (starter), or open the main power
disconnect switch to the burner. Within 3 to 4 seconds after the blower motor is de-energized,
the meter should indicate an open air flow switch circuit (no continuity).
7)
If the switch does not open in 3 to 4 seconds, readjust accordingly. Turn the air flow switch
adjustment screw clockwise to shorten cut-off response time and counter-clock-wise to lengthen
cut-off response time.
8)
Turn the burner power off. Remove the shorting clip from the two disconnected wires and cap
them with a wire nut, let them hang loose (they will be powered with 110 volts, so don’t let them
ground out).
9)
Open the gas train checking cock. Turn the burner on. With the wires disconnected, the burner
should go into a purge cycle, although neither the ignition nor the main fuel valve circuits will be
energized. If they do energize, there is a wiring problem. Correct as required.
10)
Turn power off. Reconnect the air flow switch wires to the air flow switch terminals. Place burner
back into normal operation.
3.4.24 The Owner’s Operating Instructions, at the end of this manual, should be posted in a clearly visible
location close to the burner.
3.4.25 If the burner operation is abnormal, refer to Section 5, Troubleshooting, as well as troubleshooting
information included in the flame safeguard manufacturer’s bulletin shipped with the burner. It is also
strongly suggested that all test procedures outlined in the flame safeguard control manufacturer’s bulletin
be conducted.
3.4.26 Complete the Burner Start-up Information and Test Data sheets on pages 32, 33 and 34.
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3.5.1 Power Flame Model UCM oil burners are of the air atomizing forced draft type.
3.5.2 Check oil and gas piping (if applicable) for leaks and check all controls for compliance with codes and
insurance requirements.
3.5.3 Install oil pressure and vacuum gauges. See Figure 4 for mechanical operation and oil and air pressure
gauge location for the system. Check suction line to be sure manual valve is open and that any check
valves are opening in the proper direction of oil flow. Check oil filter for tightness. There should be no
manual valve in the return line from pump to tank. Refer to Figure 6 for the approximate nozzle oil
pressures for a specific firing rate. The corresponding atomizing air pressures will typically be 5 to 10 PSI
lower than the oil pressure at high fire.
NOTE
: During pre-purge make an initial atomizing air adjustment
of approximately 20 to 30 PSI by setting the bleed valve on the compressor. At low fire the atomizing air
pressure will typically be 5 to 10 PSI higher than the oil pressure. The atomizing air line from the
compressor to the burner shall be a minimum of ¾” NPT for the UCM-200 through the UCM-600, for a
maximum equivalent length of 300 ft. Larger UCM models shall have a minimum of 1” NPT for the
atomizing air line.
3.5.4 Gas Pilot Oil Ignition. Install a manometer or 0-10” W.C. gas pressure gauge in the pilot gas pressure
test port. See pages 15 for details on gas pilot adjustments. Disconnect the pilot gas line at the inlet to
the pilot gas pressure regulator and bleed air out of the pilot line. Make certain that the gas pressure to
Summary of Contents for UCM-1000
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