I have an APC Smart-UPS 1400XL (SU1400RMXL3U) with three additional battery packs. The unit is working fine in terms of voltage, etc. The problem is that the fan is running 100% of the time and it is quite noisy. The server rack is near my desk and I am trying to find a way to reduce the noise.
There is very little load on the unit (just one of five Load LED lights on the front panel are lit). When I sign into PowerChute BE that measures status every 15 minutes I see that the load over the last 5 days ranges from 17% to 20% and that the internal temperature ranges from 23.5C to 26.5C with very few of the temperature measurements being 26C or higher.
I have looked everywhere but cannot find a service manual on the unit. I do not want to replace it as all the batteries are working fine and to replace the set-up would be thousands of dollars. I am hoping I could replace the fan within the unit with one that delivers the same or more CFM at a much lower noise level.
I have found many posts about how these units are noisy - but no solutions. Any help would be greatly appreciated.