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It sounds like your PTAC (packaged terminal air conditioner) unit is malfunctioning. When the thermostat is set to heating mode, the PTAC should be blowing warm air, not cold air. There are a few possible causes for this issue:
The PTAC may be low on refrigerant. If the unit is low on refrigerant, it may not be able to properly heat the air.
The PTAC's reversing valve may be stuck in the cooling position. The reversing valve is responsible for switching the flow of refrigerant between heating and cooling mode. If it is stuck in the cooling position, the PTAC will blow cold air even when the thermostat is set to heating mode.
The PTAC's heating element may be malfunctioning. If the heating element is not functioning properly, the PTAC will not be able to heat the air.
I recommend contacting a trained HVAC technician to diagnose and fix the issue with your PTAC. They will be able to determine the cause of the problem and repair it properly.
If the unit is frozen you should be able to see ice at the indoor coil. If you pull the air filters and peer inside to the indoor coil there may be ice. Either way it needs service. If no ice and blowing cool not cold it could be the condenser coil is dirty. On the outside you can see the air leaving side of the condenser coil. The air entering side is the side that gets dirty and can only be seen by pulling the unit out of the wall. Its best to leave it in the wall and call a tech that has experience with ptacs.
If you are saying this happens on a really cold night, the assumption is that on milder nights, it seems to work adequately.....If that's the case, there is a possibility that it is marginally sized in capacity to heat the space in which it is installed. If it has a "fresh air" damper setting, make sure that is closed completely, because that is air directly from outside the structure that is being brought in through the blower and adds more load to the space and makes the discharge air feel colder.
switch off the unit, manually open the vents and check how dirty the fan blades are. Clean if required. if clean check gas level ,the fan speed is deturminded by the gas
The 265/277v units will not work in a 208/230v hotel without a transformer. Basically you do not want to get involved with that. When replacing your PTACs stick with the proper voltage. As far as a conversion kit, if one exists, the cost will put you right back at the cost of a new unit. If your hotel is wired for 208/230v it won't give the unit the power it needs to function properly. When looking for replacement units here's what you need to match (besides getting the proper BTUs): Voltage Unit size (make sure they fit in your existing sleeves) Power cord configuration (the 265/277v will have a different power plug) Good Luck!
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