Question about Haier CWH18A Commercial Cool 18,000 BTU RAC Electronic Control Window AC Air Conditioner w/ 16,000 BTU Heater - R-104A Refrigerant, 4-way Air Flow, 3 Cool Setting, 3 Fan Setting, 24-Hour on/off Timer, Auto Restart, 208230 Volt. Covers 700 - 1,000 sq ft
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Yes, hose needs to connect to outdoors, since it operates as a heat pump. You'll notice cold air blowing out the exhaust when in heating mode, and hot air blowing out the exhaust in cooling mode - unit exhausts opposite of temperature you want.
I think your unit is working in good condition. If you keep in cool mode the out door fan runs to condensate the heat in condenser by taking fresh air from the ambient. And when you keep heat mode, definitely the ambient temp will be too less.I fit takes from their then compressor will get frozting and it couldn't work properly. Depending on pressure increase, the fan will automatically run and stop. Don't worry. Thanks.
when the coils freeze up , from intake of outside air, when using the heat pump mode, the unit will try to defrost the coils before going back to heat mode. mine did this alot. does it kick back to heat after a few mins? also after 2 years , mine started having issues with the exhaust blower control and would go into warp mode and bang noise.seems like common issues for this unit.whether the amana, or haier version.