EMI WLCA Troubleshooting Section, Unit will not Operate, Possible CAUSES/REMEDIES

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TROUBLESHOOTING SECTION

RED ALARM LED FLASHING AT 1 SECOND INTERVALS (Microprocessor units only)

POSSIBLE CAUSES/REMEDIES

FAULTY FLOAT SWITCH. See section “Condensate High Level.”

FAN TRIP. See section “Fans Will Not Run.”

INDOOR COIL SENSOR FAILURE (CONNECTED TO MI- CRO TERMINAL ‘T3’). After checking the above, use the unit wiring schematic to isolate the indoor coil sensor and measure the resistance. Sensor is 50K@72°F type. Check and replace if necessary.

RED ALARM LED FLASHING AT 5 SECOND INTERVALS (Microprocessor units only)

POSSIBLE CAUSES/REMEDIES

RETURNAIR SENSOR FAILURE (CONNECTED TO MICRO TERMINAL ‘T1’). Use the unit wiring schematic to isolate the return air sensor and measure the resistance. Sensor is 50K@72°F type. Check and replace if necessary.

TRANSMITTER FAILURE (MICRO UNITS ONLY). Try new batteries first, if receiver bleeps on transmitting signal, trans- mitter is OK. If no response press On/Off button on unit fascia. If the unit responds to the On/Off button transmitter is faulty.

MICROPROCESSOR FAILURE (MICRO UNITS ONLY). The microprocessor is the least likely component to be at fault. Investigate all other possibilities in every section of this troubleshooting guide first. Replace the micro only after all other avenues of investigation are exhausted.

WATER LEAKING FROM UNIT

(See “Condensate High Level.”)

POSSIBLE CAUSES/REMEDIES

CONDENSATE PLUG LOOSE OR MISSING. Check that the rubber condensate plug is securely fitted to the under- side of the unit’s polystyrene drip tray. On some models this is located underneath the fascia support rails on the pump side of the unit.

UNIT INSTALLED UNEVENLY. With fascia removed, ensure that the unit chassis is level (at the face) both front to back and left to right, to ensure correct condensate flow.

UNIT WILL NOT OPERATE

POSSIBLE CAUSES/REMEDIES

NO POWER (MAIN POWER). Check power supply to the unit. For micro units, check power to the micro and check the on board micro fuse.

NO 24V CONTROL CIRCUIT POWER. For DX and chilled water systems, first check that the condensing unit is switched on, then check the 24V feed from the control trans- former. If not present, check transformer windings – replace if necessary.

CONTROL CIRCUIT DISABLED BY UNIT PROTECTION DEVICE. In some models, particularly electro-mechanical units, some protection devices (such as freeze-stats, fan trips, etc) are wired in line with the 24V control circuit feed to cause the unit to shut down in an alarm condition. Use the unit’s wiring schematic to identify these devices and investi- gate accordingly.

INFRARED RECEIVER FAILURE (MICRO UNITS ONLY). If audible bleep is heard on signal transmission from transmit- ter and the green LED is lit or flashing, receiver is OK. If there are no LEDs lit and the unit will not respond to the transmitter, press the On/Off button on the fascia display panel. If the unit responds to the On/Off button receiver is OK. Check transmitter.

CONDENSATE DRAIN PIPING INSTALLED INCORRECTLY. Check that the site installed condensate gravity drain slopes ‘downhill’ away from the unit (See installation section of this manual for more information.)

BLOCKED/KINKED CONDENSATE PIPE. Check conden- sate pipework for blocks/kinks and clear as necessary. Check for a water tight connection between the PVC condensate outlet and the site installed condensate gravity drain.

CONDENSATE PUMP BLOCKED OR FAILED. Clear any blockages and ensure that power is being applied to the pump. If the pump still does not run, replace the pump.

FLOAT SWITCH FAILURE. Check that the float switch op- erates correctly and is properly positioned. Float switch is normally closed, opens on rise of water level.

CONDENSATE HIGH LEVEL

(Red alarm LED on Micro Unit

will flash at one second intervals.)

POSSIBLE CAUSES/REMEDIES

MAXIMUM PUMP LIFT EXCEEDED. Check that the con- densate pump head is no greater than 18” (See installation section of this manual for more information).

BLOCKED/KINKED CONDENSATE PIPE. See section “Wa- ter Leaking From Unit.”

ENVIROMASTER INTERNATIONAL LLC

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EMI@ENVIROMASTER.COM

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Contents Controls and Components General StatementProduct Description Site Installation PositioningCabinet Electrical Data Start UP Procedures Refrigeration System DX UnitsEMI Cassette CAH/W, CAF/4 Cabinet Dimensions EMI Cassette Mechanical DataEMI Cassette Dimensions Small CabinetMedium Cabinet Large CabinetMicroprocessor Controller Infrared Receiver & Fascia Display PanelDisplay Indicators Infrared TransmitterSetting UP the BUILT-IN Time Clock HOW to SET the Present TimeUnit Start UP Indoor Unit Control Circuit Checks DX UnitsPossible CAUSES/REMEDIES Troubleshooting SectionUnit will not Operate Water Leaking from UnitNo Heating Heat Pump Coil FreezeNo Cooling Electric Overheat Fans will not RUNPossible CAUSES/REMEDIES FAN Removal MaintenanceFilter Removal and Cleaning Condensate Tray RemovalAppendix a Wiring Charts and Instructions Appendix B Exploded Unit Drawing and Parts List Appendix C Exploded Unit Drawing and Parts List Large Cabinet

WLCA specifications

EMI WLCA, or Electromagnetic Interference Wireless Lightning Control Architecture, represents a groundbreaking evolution in the realm of electromagnetic interference mitigation technologies. Designed to safeguard sensitive electronic systems from the potentially detrimental effects of electromagnetic disturbances, EMI WLCA integrates a host of advanced features and characteristics that empower both industries and consumers.

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