Check List
n | Checkpoint | What to Check | Action |
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| Thermostat and | Wiring | Confirm Sensor connected to SignatureStatt using twisted pair |
| Sensor |
| wire (see wiring diagram figure 13) |
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| Thermostat | Humiditrol® Installer Settings | Confirm HUMIDITROL is enabled (see figure 8) |
| Thermostat | Humiditrol® User Settings | Confirm HUMIDITROL − Dehumidify − ON is selected (see figure 8) |
| Thermostat | Humiditrol® User Settings | Confirm Relative Humidity setting (see figure 8) |
| Indoor Unit | Confirm Settings for age cool | |
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| (see indoor unit installation instructions and table 1, below) |
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| Insulation | Charge Compensator |
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| Confirm insulation is properly installed (see charge compensator kit |
| Insulation | Liquid Line | |
| instructions; also, see figure 5) | ||
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| Insulation | Vent Line to Suction Line |
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| Charge Compen- | 1/4"Line | Confirm 1/4" port oriented downward (see charge compensator |
| sator |
| details, figure 5) |
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| Check/Flow Re- | 3/8" Line | Confirm restrictor installed/oriented properly (see check/flow restric- |
| strictor |
| tor details figure 5) |
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| System Charge | Refrigerant | With unit running in cooling mode, check and confirm system is |
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| properly charged (see outdoor unit installation instructions). |
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| Outdoor Unit | Fan Relay | Confirm (if unit has variable speed outdoor fan) relay is installed |
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| properly (see wiring diagram figures 12 and 13) |
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| Outdoor Unit | EDA Label | Confirm label is installed in prominent location and will be easily |
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| visible during servicing. |
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| NOTE − System will NOT operate in dehumidification mode with outdoor temperature at or above 95ºF. | ||
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| Operational Status | Dehumidification Mode | Record supply air temperature and confirm temperature that it is |
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| higher than in cooling mode. |
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| Operational Status | Dehumidification Mode | On units with variable speed outdoor fan, check that fan operates |
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| at approximately 250 rpm (lowest speed). |
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Table 1
Demand Signals − Humiditrol® EDA Enabled
Operating Sequence |
| System Demand |
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| System Response |
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| Thermostat Demand | Relative Humidity |
| Blower |
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| Com- | CFM |
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| Y1 | Y2 | O |
| G | Status | D |
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System Type | Step |
| pressor | (Cool) % | Comments | ||||||
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Cooling Operation − No call for dehumidification |
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1 | ON | (na) | ON |
| ON | Acceptable | 24 VAC | High | 100 | Compressor and indoor | |
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| blower follow thermostat |
1 | ON | − | ON |
| ON | Acceptable | 24 VAC | Low | 70 | ||
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2 | ON | ON | ON |
| ON | Acceptable | 24 VAC | High | 100 | ||
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Demand for Dehumidification and Cooling |
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1 | ON | (na) | ON |
| ON | Demand | 24 VAC | High | 100 | Cooling operation has | |
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| priority |
1 | ON | − | ON |
| ON | Demand | 24 VAC | Low | 70 | ||
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2 | ON | ON | ON |
| ON | Demand | 24 VAC | High | 100 |
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Dehumidification Mode Only − No Cooling Demand |
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1 | ON | (na) | ON |
| ON | Demand | 0 VAC | High | 50 − 70* | A Humiditrol® EDA− | |
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| equipped system is allowed |
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| to operate and cool room |
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| temperature below set point |
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| (but only by 2ºF) when try- |
2 | ON | ON | ON |
| ON | Demand | 0 VAC | High | 50 − 70* | ing to satisfy a persisting | |
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| humidity set point; it is not |
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| allowed to operate at all |
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| when outdoor temperature |
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| is >95ºF. |
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* NOTE − Blower CFM speed (percentage) will vary depending on selected indoor equipment (furnace, coil blower, etc.). |
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Page 12
EDA 01/06