Hey everyone! I've been managing a server room for over 15 years at one of our branches, and we recently replaced an old mini-split cooling unit that finally bit the dust. An HVAC company analyzed the situation and estimated that our setup, which contains about three-quarters of a rack's worth of equipment, generates around 10-15k BTUs at peak times. To be safe, they installed a new mini-split unit that has a cooling capacity of 20-24k BTUs, with the thermostat set to maintain a comfortable 75°F.
Here's where my concern lies: the new unit works great when the outside temperature is below 60°F, but as soon as it rises above that, especially when the sun is hitting that side of the building, the room temperature jumps up by 2-4°F. For instance, if it starts at 75°F, it can go up to around 79°F and stay there for hours until the sun sets, at which point it cools back down to 75°F. This trend is pretty consistent on our temperature gauge alerts.
I'm wondering if this is normal behavior for a unit of this size and setup, especially since we normally don't have a lot of equipment in there. Also, with warmer months approaching, should I be worried that this temperature spike will worsen, potentially hitting 80°F or higher? I don't remember having this problem with the old unit, which managed to cool the room even with more equipment in it. Any insights would be appreciated!
4 Answers
I'm curious about where the external unit is placed. Is it in a shaded area or receiving direct sunlight? If it’s in the sun, that could definitely impact its efficiency. And by the way, a peak of 79°F isn't alarming in most scenarios; some argue higher setpoints can reduce cooling demands overall. Just keep tracking how things escalate with the seasons.
You mentioned it's a mini-split system. The way it cools can be affected by whether it's an inverter model and how well insulated the room is. If the unit isn't matching your actual heat output due to these factors, you may want to look at accounting for more heat load. Also, check if your unit is properly sealed; any leaks could impact efficiency.
Good point! They claimed to have checked the refrigerant levels carefully, so maybe it’s time to investigate insulation and sealing. Thanks!
Honestly, 80°F isn’t generally considered unsafe for most server gear. A little temperature spike during the day might just be normal operations. You could also think about setting your unit to a cooler baseline temperature to counteract those midday spikes. Just keep an eye on things as it gets hotter outside.
Yeah, I might be overthinking this! I didn’t want to risk too high temps, but I guess 80°F isn’t a disaster.
It sounds like your cooling needs might have been underestimated. Since they’ve rated your new unit for 20-24k BTUs, it should technically handle your setup, but if you’re seeing those temperature spikes, it’s a sign something’s off. I'd suggest calculating your actual power consumption and comparing it to the BTU output. This might help you prove to the HVAC company that you need a bigger unit.
Yeah, that makes sense. The cooling calculations can be a bit tricky if they didn’t consider how much power you’re actually using.
The unit is a Daikin ATMOSPHERA, and the outside part does get hit by sun; that’s a good point. I’ll keep tracking it as summer approaches!