Table 8. Sensor Temperature / Resistance Range
| Temperature | Resistance values | Pins/Wire |
Sensor | Range °F (°C) | range (ohms) | Color |
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Outdoor | −40ºF to 140ºF | 280,000 to 3750 | 3 and 4 |
(Ambient) | (−40ºC to 60ºC) |
| (Black) |
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Discharge | −35ºF to 310ºF | 41,000 to 103 | 1 and 2 |
| (−37ºC to 154ºC) |
| (Yellow) |
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Note: Sensor resistance decreases as sensed temperature increases (see Figures 6 and 7).
Main Control LED Alert Codes
Main Control LED alert codes (simply referred to as LED alert codes) are located on the Main Control and marked with the following identification.
DS11 AND DS14 LED SYSTEM AND ALERT CODES DS11 (Green) and DS14 (Red) LEDs indicate diagnostics conditions that are listed in Table 9.
These LEDs display fault conditions in system cooling capacity, dehumidification mode, anti−short cycle lockout, high and low pressures, discharge line temperature, outdoor temperature, and discharge sensor failures.
DS15 AND DS13 LED COMPRESSOR ALERT CODES DS15 (Yellow) and DS13 (Red) LEDs indicate diagnostics conditions that are listed in Table 9.
These LEDs display the most common fault conditions in the system. When an abnormal condition is detected, this function communicates the specific condition through LEDs. The diagnostic function is capable of detecting both mechanical and electrical system abnormal conditions.
RESETTING LED ALERT CODES
LED alert codes can be reset either manually or automatically:
1.Manual Reset
Manual reset can be achieve by one of the following methods:
S Disconnect R wire from the Main Control’s R terminal.
S Turning main power OFF and then ON at the unit’s disconnect switch.
After power up, existing code will display for 60 seconds and then clear.
2.Automatic Reset
After an alert is detected, the Main Control continues to monitor the unit’s system and compressor operations. When/if conditions return to normal, the alert code is turned off automatically.
IMPORTANT
LED alert codes do not provide safety protection. The is a monitoring function only and cannot control or shut down other devices.
Table 9. System LED Alert Codes
Outdoor Main Control |
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| LEDs |
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| Condition | Possible Cause(s) | Solution |
DS11 |
| DS14 Red | |||
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Green |
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| SYSTEM STATUS | |
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OFF |
| OFF | Power problem | No power (24V) to control | 1 Check control transformer power (24V). |
| terminals R and C or | 2 If power is available to control and LED(s) do not light, replace control. | |||
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| control failure. | |
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Simultaneous SLOW | Normal operation | Unit operating normally or | Indicates that control has internal component failure. Cycle 24 volt pow- | ||
| Flash | in standby mode. | er to control. If code does not clear, replace control. | ||
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Alternating SLOW
Flash
5−minute anti−short cycle delay
Initial power up, safety trip, end of room thermostat demand.
None required (Jumper FIELD TEST pins to override)
Simultaneous FAST | Ambient Sensor | Sensor being detected open or shorted or out of temperature range. control will revert to time/temper- | |||
| Flash | Problem | ature defrost operation. (System will still heat or cool). | ||
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| Coil Sensor | This model does not utilize a coil sensor, however this alert indicates either an open or shorted circuit. | |
Alternating FAST Flash | See if 10K resistor is not damage or missing. Resistor is located in the sensor harness assembly, | ||||
Problem | |||||
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| brown lead. | ||
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ON |
| ON | Main Control | Indicates that control has internal component failure. Cycle 24 volt power to control. If code does not | |
| Board Failure | clear, replace control. | |||
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Page 35
XC17 SERIES