PDX Series
PDX SERVICE PROCEDURE IV
Blower Testing and Replacement
Blower Testing |
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| 115 volt potential exposure. Use caution when | |||
Step 1. | Position gas control power switch | making voltage checks to avoid personal injury. | ||||
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| to “ON” position and adjust control to call for heat. |
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Step 2. | Remove the three screws (Phillips Screw driver) | 8 |
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| from control access cover on blower assembly and |
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| remove cover (see photo 8). |
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| Connect | Disconnect vent |
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| Disconnect | system from top of |
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| manometer to |
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Does blower energize Within 2 Y | pressure switch | blower and remove |
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pressure tap of |
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| minutes? | tubing from blower. | exhaust vent |
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| blower. |
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| (see photo 13) | adapter. |
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| (see photo 11) |
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| N |
| (see photo 15) |
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| 10 | Remove exhaust |
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| Pressure tap | adapter |
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| 9 |
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| With blower running, and exhaust | Y |
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| adapter removed from top of blower, | Blower OK | |
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| is there a negative pressure of |
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| to |
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Pressure switch
tubing
N
Does blower energize after 2 |
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| Y |
| See pressure switch |
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minutes, run for 30 seconds |
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| testing |
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and shut down? |
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| N |
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Disconnect cord set |
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shown in photo 9. Is |
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| Is there 115VAC across | |||||
there 115VAC across |
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| terminals shown in | Y | |||||
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terminals shown in photo |
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| photo 13 ? |
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12 |
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| N |
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| N |
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| Incorrect supply |
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| voltage polarity |
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| Determine | Replace | ||
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Is there 115 VAC at |
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| power source | ||||||
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| cord set | |||||||
wall outlet? |
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| problem and | ||||
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| correct. |
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Check power cord | Y |
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| Repair or replace |
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for damage. |
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| power cord |
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Replace blower
Determine voltage | N | Is there 115vac across blue | Y |
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and green wires | Replace blower | ||||
problem and correct. |
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| (see photo 14) |
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12 |
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Reconnect cord set shown |
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| in photo 8, is there | Y | |||
115VAC between blue wire |
| Replace blower | |||
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and green ground wire |
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| (see photo 14) |
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| Green ground | |
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| Does cord set |
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N | 14 | ||||
have electrical | |||||
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| continuity? |
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| Blue wire | |
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| Replace gas |
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| control |
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| Shown with pressure | |
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| switch removed. | |
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