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TROUBLESHOOTING AND REPAIR |
MAIN TRANSFORMER AND CHOKE
REMOVAL AND REPLACEMENT (continued)
FIGURE F.19 – TRANSFORMER REMOVAL
CONTROL |
| NEGATIVE |
| OUTPUT | AUXILIARY | INPUT |
| OUTPUT LEAD | A | ACCESS | |||
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| CHOKE | LEADS | |||
PANEL |
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| COVER | ||
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A |
| SECONDARY | A |
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| A |
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| LEAD (6 PLACES) | A |
| A |
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| A |
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FIRING BOARD |
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CONNECTORS |
| A |
| A |
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| A |
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| A | |
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| A |
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215 |
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210 |
| A |
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A |
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OUTPUT |
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| A |
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SHUNT |
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CONNECTION |
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STRAP |
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| A |
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SECONDARY | 30 Ω |
| MOUNTING |
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BAFFLES | HARDWARE |
| PRIMARY |
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THERMOSTAT | RESISTOR |
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| (4 PLACES) |
| LEADS |
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REMOVAL PROCEDURE
1.Disconnect all input power and remove the case top, sides, terminal strip cover and the input access cover and drop the Control Panel.
2.Remove the fiber baffles that are around the Choke and Transformer and save for installation when the new transformer is installed.
3.Disconnect the Transformer Primary leads from the reconnect panel.
NOTE: Pay close attention to the positioning of the brass and steel hex nuts for reassembly.
4.Pull the leads out of the Input Box. This will require removing some of the RTV sealant from the inside of the box.
NOTE: Tag any leads where the Lincoln lead num- bers are not evident to facilitate reassembly.
5.Cut off the crimp connectors from the fan leads (#31 A) and lead #41 and #42A. Tag any leads where the Lincoln lead number is not evident.
NOTE: Cut ties and remove sleeving as necessary to perform the following steps. Note the positioning for reassembly.
6.Disconnect leads #271 and #272 from th e Contactor coil and pull them through the back of the Input Box.
7.Disconnect the leads from the Secondary Thermostat and separate the X2 lead from te #256 lead.
8.Pull the three leads from Step 4 and the #271 lead- towards the Control Box.
9.Disconnect the #41, #2, and #4 leads from the Terminal Strip and separate the
10.Separate the three
11.Unplug J5 and J4 from the Firing Board and work them through the bottom of the Control Box. It will be necessary to remove the grommet with the J4 connector. (A new grommet is provided with the replacement transformer).
