Good evening all! Last week I came home from work to a happy wife all too happy to let me know the AC was broken upstairs. I went up and started checking things out and found the evaporator coil completely frozen up. I turned the unit off and let it thaw overnight and went back to troubleshooting the next day after I cleaned the coils (a little mold/dust) and cleaned the electrostatic filter. The coil froze up again within 5-10 minutes so I turned it off and let it thaw again. I opened the entire side of the AHU and noticed the blower motor wasn't turning on.
It had been a while since testing many AC circuits (I used to be an electronics technician on aircraft) but I found I was getting 240VAC between the COM and Power wires and the ground was good. I did a little research and found a video on troubleshooting X13s and then checked for the 24V line to the speed terminal. This is where my question comes in. The video says it should be 24V, the wiring diagram does not indicate voltage, and I am reading 120VAC with the system off and 94VAC with it selected on. I am confused with the fact that I have voltage with it selected off but the voltage drop after selecting on is very close to 24V. My inclination is to say it is a failed blower but before I drop $-$ buck-a-roos I want to be positive.
The unit is a Carrier Model No. FC4DNF036 (very little found online about these)
The blower is an X13 FM07 1/2HP 230V motor
I would love it if someone could sanity check me and thank you all so much for the help in advance.
It had been a while since testing many AC circuits (I used to be an electronics technician on aircraft) but I found I was getting 240VAC between the COM and Power wires and the ground was good. I did a little research and found a video on troubleshooting X13s and then checked for the 24V line to the speed terminal. This is where my question comes in. The video says it should be 24V, the wiring diagram does not indicate voltage, and I am reading 120VAC with the system off and 94VAC with it selected on. I am confused with the fact that I have voltage with it selected off but the voltage drop after selecting on is very close to 24V. My inclination is to say it is a failed blower but before I drop $-$ buck-a-roos I want to be positive.
The unit is a Carrier Model No. FC4DNF036 (very little found online about these)
The blower is an X13 FM07 1/2HP 230V motor
I would love it if someone could sanity check me and thank you all so much for the help in advance.
