TROUBLESHOOTING GUIDE
Series 44 Room Temperature Control continued |
| Reproduced with permission from Maxitrol® Company | ||||
Symptom |
| Possible Cause |
| Field Test |
| Remedy |
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E. continued | 3. | Incorrect space | 3. | Follow procedures outlined | 3. | If proper action is obtained, |
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| temperature calibration. |
| in “Preliminary Circuit |
| first check item E2. |
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| Analysis” in Section IX. |
| Recalibrate if necessary. |
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F. Incorrect | 1. | Improper TS144 | 1. | Compare sensed | 1. | Move TS144 to location |
Maximum or |
| location. |
| temperature reading at |
| where average temperature |
Minimum |
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| TS144 with average |
| can be sensed. |
Discharge Air |
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| discharge air temperature. |
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Temperature. | 2. | Incorrect discharge | 2. | Follow procedures outlined | 2. | If proper temperatures are |
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| air temperature |
| in “Preliminary Circuit |
| not observed, refer to |
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| calibrations. |
| Analysis” in Section IX. |
| Discharge Air Temperature |
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| calibration procedures. |
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G. Continuous High | 1. | Foreign material | 1. | Remove bottom plate and | 1. | Clean, replace valve and/or |
Fire (Electronics |
| holding valve open. |
| inspect valve and seat. |
| seat if necessary. |
OK). | 2. | Plunger jammed. | 2. | Inspect. Plunger should | 2. | Clean, or if necessary, |
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| be smooth and clean and |
| replace plunger |
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| operate freely in solenoid |
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| sleeve. |
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H. Continuous High | 1. | Open circuit in TS144. | 1. | Measure resistance per | 1. If readings are incorrect, | |
Fire (Electronics |
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| item C3. |
| replace the TS144 or repair |
Problem). |
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| wiring. |
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I. Incorrect High Fire | 1. | Inlet pressure too low. | 1. | Read inlet pressure at valve | 1. | Increase inlet pressure if |
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| using manometer with |
| possible or change to larger |
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| heater operating at full fire. |
| valve. Consult factory |
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| Pressure should be at least |
| about possibility of using |
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| equal to the sum of: outlet |
| special spring to reduce |
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| pressure setting and |
| pressure drop on selected |
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| pressure drop of the valve |
| installations. |
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| plus 1.0” W.C. |
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| 2. | Incorrect outlet | 2. | Read outlet pressure using | 2. | See Valve Adjustments in |
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| pressure adjustment. |
| manometer and compare |
| Section IX. |
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| with the pressure stated |
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| on the specification plate. |
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J. Continuous | 1. | Faulty amplifier. | 1. | Follow procedures outlined | 1. | If amplifier is proven at |
Maximum Discharge |
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| in “Preliminary Circuit |
| fault, install replacement |
Air Temperature. |
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| Analysis” in Section IX. |
| amplifier. |
| 2. | Open circuit in T244 | 2. | Measure resistance per | 2. | If reading is incorrect, |
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| or TS244/TD244. |
| item E2. |
| replace T244, |
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| TS244/TD244 or repair |
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| wiring. |
| 3. | Incorrect space | 3. | Follow procedures outlined | 3. | If proper action is obtained, |
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| temperature calibration. |
| in “Preliminary Circuit |
| first check item J2. |
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| Analysis” in Section IX. |
| Recalibrate if necessary. |
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K. Burned out | 1. | Short in modulator coil | 1. | Measure resistance per | 1. | If proper resistances are |
Transformer. No |
| circuit. |
| item B1. |
| not observed, replace |
Voltage to Amplifier. |
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| modulator head or repair |
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| wiring. |
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Control circuits external to Series 44 can cause burner malfunction. Always check manual valve to be certain gas is on, and check limit controls for normal operation.
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