TROUBLESHOOTING GUIDE
Series 14 Discharge Temperature Control continued | Reproduced with permission from Maxitrol® Company | |||
Symptom | Possible Cause |
| Field Test | Remedy |
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E. Continuous High | 1. Short circuit in TD114 |
| 1. Inspect for shorts at or | 1. Correct wiring if shorts exist. |
Fire (Electronics | Remote Temperature |
| between Amplifier terminals |
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Problem). | Selector circuit or wiring. |
| 1 & 2 or TD114 terminals |
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| 1 & 3. |
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| 2. Open circuit in |
| 2. Check TS114/TS1007 for | 2. If modulating voltages are |
| TS114/TS1007 |
| open internal circuit. | obtained, check TS114/ |
| Discharge or Inlet Air |
| Connect test resistor as | TS1007 for open circuits. |
| Sensor circuit or wiring. |
| described in Preliminary | Replace TS114/TS1007. |
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| Circuit Analysis. Follow |
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| procedure outlined. |
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| 3. Jumper not connected |
| 3. Inspect. | 3. Correct the wiring. |
| across amplifier |
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| terminals 2 & 3. |
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F. Continuous High | 1. Foreign object holding |
| 1. Remove bottom plate and | 1. Clean seat. Clean valve |
Fire (Electronics | valve open. |
| inspect valve and seat. | or replace if necessary. |
OK). | 2. Plunger jammed. |
| 2. Inspect. Plunger should be | 2. Clean or, if necessary, |
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| smooth and clean and | replace plunger |
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| operate freely in solenoid |
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| sleeve. |
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G. Incorrect | 1. Inlet pressure too low. |
| 1. Read pressure at inlet to | 1. Increase inlet pressure if |
Maximum Fire. |
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| modulating valve using a | possible. |
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| manometer with unit |
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| operating at full fire. |
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| Pressure should be equal |
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| to the sum of outlet pres- |
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| sure setting plus pressure |
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| drop of the valve. |
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| 2. Incorrect outlet pressure |
| 2. Read manifold pressure | 2. See valve adjustments in |
| adjustment of Pressure |
| using manometer and | Section IX. |
| Regulator. |
| compare with the pressure |
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| stated on the specification |
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| plate. |
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H. Erratic or Pulsating | 1. Hunting |
| 1. Adjust sensitivity control | 1. If flame stabilizes, adjust |
Flame |
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| sensitivity control to | |
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| maintain an even flame. |
| 2. Erratic air patterns or |
| 2. Connect test resistor | 2. If the flame is steady |
| improper TS114 location. |
| as described in Preliminary | throughout the entire |
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| Circuit Analysis.Turn | modulating range, the |
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| TD114 selector dial so | TS114 must be moved. |
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| heater goes through its |
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| entire modulating range. |
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| 3. Wiring is run next to |
| 3. Temporarily wire each | 3. If smooth operation |
| high voltage switching |
| TD114,TS114 and MR212 | results, isolate affected |
| circuits causing induced |
| externally and observe | wiring from source of |
| voltages. |
| heater/equipment | induced voltage. |
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| operation. |
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