Alarm messages
Alarm Message | Action Required |
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High head pressure | Ensure condenser exhaust air diverter is not blocked, facing a wall, or |
| pointed at the condenser air inlet. |
| Check the area above the ceiling where the condenser air is circulating |
| for excessive heat buildup. Additional ventilation may be required. |
| Check the condenser inlet filter for cleanliness. |
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Supply temperature | Alarm setpoint may be too low. Alarm should normally be set to 10° (C |
high | or F) above the cool setpoint plus the dead band. |
| Check that the unit is in cool mode and the compressor is running. |
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Supply temperature | Alarm setpoint may be too high. |
low | Front airflow may be obstructed. Check the return air filter for |
| cleanliness. Check the front discharge air grille for free air movement. |
| Cooling setpoint may be too low to allow for at least an 11°C (20°F) |
| temperature differential between return and supply temperatures. |
| Example: A setpoint of 21.1°C (70°F) could have a supply temperature |
| as low as 10°C (50°F). |
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Return temperature | Alarm setpoint may be too low. |
high | Check that the unit is in cool mode and the compressor is running. |
| |
| Equipment capacity may be too small for room load. |
| Ensure that return air (air coming back to the equipment) is not from a |
| direct heat source, equipment discharge fan, or room supply duct. |
| Alarm delay may be too short. Sufficient time must be allowed to let the |
| equipment bring the temperature in the space under control. This is |
| especially true at equipment |
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Return temperature | Alarm setpoint may be too high. |
low | Verify that the return air is not coming from a cold air supply source such |
| |
| as a room discharge duct. |
| There should not be any obstructions near the grill front that could divert |
| supply air back to the return air grill. |
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NetworkAIR ACPA4000 | 31 |