Daikin Enfinity Installation And Maintenance Manual

Daikin Enfinity Installation And Maintenance Manual Manual pdf 43 page image

troubleshootingMicroTech III unit controller LED faults and remedyTable 16: I/O expansion communication failDescription Type Yellow Green RedI/O Expansion Communication Fail Fault ON Flash Flash• Verify connection of 12 wire cable between H5 on the main board and H1 on the I/O expansion board is fully engaged in the connector.• Verify run program jumper on the I/O expansion board is installed in the run position.• Replace the run jumper with a spare jumper.• Replace I/O expansion board.Table 17: Invalid configurationDescription Type Yellow Green RedInvalid Configuration Fault Flash Flash OFF• Verify jumper selection on both the main board and I/O expansion board. Jumper selections must be verified using the jumper configuration set-ting outline in this manual.Table 18: Low voltage brownout / emergency shutdownDescription* Type Yellow Green RedLow Voltage Brownout Fault OFF Flash OFFEmergency Shutdown Mode OFF Flash OFF* Same LED display for both conditions• Verify the E terminal is not connected to common. Remove wire, if connected, and LED should change to solid green only.• Confirm the low voltage supply is between 19-32VAC at the H1 terminal of the main board. If the low voltage supply is out of range, verify the unitsupply voltage matches the nameplate voltage and the correct transformer primary wire has been selected.Table 19: Compressor high pressureDescription Type Yellow Green RedCompressor High Pressure Fault OFF OFF Flash• Verify high pressure switch is connected to terminal H3 on the main board.• Check for continuity of the high pressure switch.If the high pressure fault resets when power is recycled:• Check water flow (cooling operation)• Check airflow (heating operation)• Entering water and air temperatures should be within the operating limits.Table 20: Compressor low pressureDescription Type Yellow Green RedCompressor Low Pressure Fault OFF OFF ON• Loose wire connection on low pressure circuit• Failed low pressure switch• Unit is low on chargeTable 21: Compressor suction temp sensor fail, room temp sensor fail, leaving water temp sensor failDescription Type Yellow Green RedCompressor Suction Temp SensorFail Fault Flash Flash ONRoom Temp Sensor Fail (Room Sen-sor Control Only) Fault Flash Flash ONLeaving Water Temp Sensor Fail Fault Flash Flash ON• Check connection of low suction temperature sensor on terminal H6 pins 2 and 3.• Check resistance of low suction temperature sensor, leaving water temperature sensor, and room sensor or return air sensor. All sensors are10kohm thermistor @77°F.• Return air sensor and room sensor shall not be connected simultaneously.www.DaikinApplied.com 43 LARGE VERTICAL WSHP IM 1059-12