Generalaire 1099 Humidifier with Carrier Greenspeed Heat Pump and fan coil not providing enough humidity
Generalaire 1099 Humidifier recently installed with 4 ton Carrier greenspeed heat pump with corresponding fan coil. Humidifier is rated for 3000 sq ft house with up to 19.2 us gallons output. House size is just under 2800 sq feet. Humidifier working correctly, water supply is on, but unit isn't able to keep humidity above 31%.Humidifier seems to be working properly, water supply is turned on, humidifier is turned on and a continuous fan on the fan coil is set to work whenever the system determines there is a need. Required humidity level set to 40% but system only giving 27 to 31% humidity. Carrier thermostat is controlling humidity levels and sensors.
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If your humidifier is working properly, then the problem lies outside of the humidifier. For example how long does your furnance run when the thermostat calls for heat? If your furnace is oversized for your home, it will heat your home relatively quickly, and turn off, while your humidifier does not have a chance to work long enough for it to increase the humidity. If this is the case, you could try to set the thermostat to run the fan in manual mode instead of automatic. This will give the humidifier a chance to increase the humidity.
Really not efficent to run a heat pump at those temperatures. Below freezing is not good for the compressor in the outside unit. The humidity in the house with the low temp. is causing the condensation on the windows to freeze. Kinda like an air conditoner does in the summer without the freezing humid air from the house goes over the cold a/c coil and the moisture condensates on the coil running down to drain pan. raising the temp. in the house and lowering the humidity should help. I would also recommend running the electric heat in low outside teperatures.
Hello. I am here to help. Let me begin by saying that a dehumidifier only needs to be operated if the humidity in your home is too high. If the humidity is low, the humidifier will have to work really hard to try and remove water from it.
Here is an overview of how the dehumidifier is supposed to work:
When the unit runs, the circulating fan and compressor also run. The fan continually draws room air over the evaporator coils, which are cold, and then over the condenser coils, which are warm. Because the evaporator coils are cold, the moisture in the room collects on them--just as the outside of a glass of icy liquid "sweats" on a warm, humid day. When the moisture on the coils increases, it drips off of the coils into the collection container.
The air then flows over the warm condenser coils and out into the room. This process removes water from the air and, because of the heat from the fan motor and compressor motor, the exiting air is somewhat warmer, as well as dryer.
Depends on how this humidifier operates. Most now using water in from a valve let the excess water on through the pad and down the drain and have no sump or pump because of bacteria build up (Legion Aries Disease).
Also as outdoor temp drops you need and air is only able to "soak up" just so much humidity. The air will hold more moisture at 45'f than at 25'F. And you need less humidity at these levels do do some of the same job like static electricity, and keeping wood from drying out...
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The max the aprilaire can put out is 45% Rh. Your humidifier may wired up to run only when the heat is on. In some cases this is not enough time to maintain your humidity level your seeking. To correct this, the hum. has to hooked up the hot side of the water supply. And the humidifier has to be hooked up when the fan runs and leave the fan run constantly
When your unit is on normal the outside unit works and the inside only the fan runs. your heat pump does not remove any humidity when it operates so the installation cotractor did not wire it to operate then. you can change the wiring on the humidifier to operate all the time by wiring it to the fan (g) terminal then it should work just turn it all the way to the lowest humidity when you are in cooling mode.
It sounds like the humidifier may be improperly wired.
It's hard to solve without checking the wiring, but it seems like the humidistat is wired so that as the dial is advanced, it incorrectly turns on the fan, or furnace, or both. The contacts of the humidistat should be wired so that they turn on the solenoid only. Also, the power to the humidistat, to turn on the solenoid, should come on only when the fan is on.
Hope this helps!
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