- #Emc motors wiring diagram hvac how to
- #Emc motors wiring diagram hvac manuals
Once the problem is corrected, confirm that the low voltage communication is applied to a programmed tap. Always check low voltage between terminals 1-5 and (C) at the motor, never ground. If no low voltage communication (typically 24vac) is measured at the motor on taps 1-5, check the HVAC system wiring, controls and demand call.
The sequence of operation of the manufacturer’s controls or circuit board (where the low voltage communication is sent from the unit control to the motor from each thermostat demand and if there are any delays). Where on the manufacturer’s controls or circuit board does the low voltage communication come from by demand or mode?. Use the manufacturer’s wiring diagram or sequence of operation to see what taps are used and programmed. Keep in mind, even though the motor has 5 possible inputs, with some applications, all of the taps may not be programmed. In other word, which is High, med high, med low, low-speed in relation to the positions on the motor. Which tap(s) have been programmed and what are their purposes (heating airflow, cooling airflow, continuous fan airflow). The following information must be known before troubleshooting the low voltage communication to this motor. You cannot use the “wild or stinger” leg on a 3 phase system. Proper grounding should always be checked and repaired if needed.Īlso, if you read my post on X-13 motors in 3-phase systems, both power legs to the X-13 motor must be the same. If the voltage is above or below the ± 10% of these ratings, fix the voltage problem first, and try to run the motor. If the voltage is within ± 10% of these ratings then move on to the next step. If this voltage is missing, fix the problem in the system and try to run the motor. On 115vac systems, make sure the polarity or the power connected to the motor is correct. Applying incorrect high voltage to the X13 motor may cause the motor to not operate, or even damage the motor. There should be 115vac or 230vac, depending on the model, between these two terminals whenever there is power to the system, regardless of a demand call. – Checking the High voltage input : First check the high voltage to terminals (L) and (N). There are two inputs needed to operate this motor, (1) a high voltage constant power source, and (2) the communication that selects the torque value (cfm) in each tap per demand. Always disconnect the power to the HVAC system before disconnecting or reconnecting any connectors to these motors. If the motor is not running, the following checks will diagnose whether it is a good or bad motor. Check the system static pressure and make repair(s) if it is above the manufacturer’s recommended maximum level. Check the air distribution system components for dirty components and closed dampers, registers and grilles. Check the tap selections using the manufacturer’s guide for cfm vs. The problem is most likely external to the motor. 
If the motor is runningbut the system is noisy, shutting down on its limits or safeties or the evaporator coil is freezing, there is a good chance the motor is good.
( When all else fails, read the instructions).
#Emc motors wiring diagram hvac manuals
The unit’s manuals will typically be required for these settings and can also provide valuable sequence of operation and troubleshooting help. On X13 motor systems (as with any blower) it’s also a good practice to check the tap (speed) selections and delay (both on delay, if available, and off delay) settings on the control board.
#Emc motors wiring diagram hvac how to
Now that you understand what it is, now we can discuss how to properly troubleshoot the X-13 motor.īefore troubleshooting any HVAC system, it’s a good practice to become familiar with the components and wiring diagram, check for and follow any on board diagnostics (fault codes in the manufacturer’s control board). In a previous post, I explained what an X-13 (constant torque) motor is and how they operate.
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