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Aprilaire RP-400A
ByPass Flow Thru Humidifer
17 Gallons Per Day
Price:
$188.00
Replaced by Model 400
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Please Order the NEW Model 400.
In 2009 Aprilaire replaced the Model 400A and Model 400M with the Model 400.
We have sold out of the 400A and Aprilaire is now shipping us the Model 400.
More Info ...
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Aprilaire 400A drainless flow-thru bypass whole-house humidifier. The Model 400A humidifier utilizes new evaporative technology to minimize water use. Gravity pulls water down, while the wicking action of the water panel draws it back to the top, using 100% of the water delivered to the unit.
The Model 400A is a complete system and includes the humidifier with a built-in bypass damper, two water panels (#45), digital automatic humidistat (Model 58) with outdoor temperature sensor, self-piercing saddle valve, and 24vac transformer (#4010). Our photos (click View More Images above) for a view of all the items included. Items not included is 6" bypass duct, copper tubing, drain tubing, and thermostat wire.
Evaporative Capacity 0.7 gph. Unit Size 15-3/8"W x 15¾"H x 10¼"D Plenum Opening 9-7/8"W x 12-5/8"H Electrical data 24 Vac, 60 Hz, 1/2A. |
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In 2009 Aprilaire consolidated the Models 400M and 400A to the Model 400.
The new Model 400 is identical to the earlier 400A, except the new 400 does not include the DVD Video.
The difference between the 400 (automatic) and 400M (manual) was the 400M included a low cost manual humidistat (#4655) instead of the Automatic Digital humidistat (#58) that was included with the 400A.
The new 400 also includes the humidistat (#58) that can be operated as a Manual or Automatic humidistat.
Previous to the 400A & 400M was the Model 400 Series One. This early Model 400 was Cream in color whereas since the 400A & 400M (2008) the color has been a light Slate. |
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The Aprilaire 400A operates best when the furnace is producing hot air.
The new Aprilaire
58 humidistat connects to the furnace thermostat terminals. This allows the Model 58 to sense when the furnace is providing hot air. Or the humidistat can be wired to sense when the blower is running with or without hot air. See the Model 58 Installation.
The Model 50 current sensing relay is no longer necessary. |
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The term Flow-Thru refers to water trickling through a water panel and out a drain. The Aprilaire 400 series has the water trickle down the water panel an in to a reservoir. The reservoir has a sensor that detects the water level. When more water is needed the solenoid is turned on, and more water trickles down the water panel and refills the reservoir.
The water panel (Stock #45) that is used in the 400 series is different than conventional Flow-Thru models. This water panel is an absorbent paper mesh that can wick up the water from the reservoir. Conventional Flow-Thru models have water panels made of an aluminum mesh with a porous pumice-like coating that absorbs water allowing the water to evaporate but will not wick up water.
Conventional Flow-Thru models flush out minerals when the water trickles down the water panel and out a drain (3 gph). The Aprilaire 400 will have some slime and mineral build-up from standing water. The Aprilaire 400 water panel needs to be replaced more often than conventional water panels (such as Stock #35). Aprilaire recommends replacing the 400 series water panel twice a season.
The model 400 should still have a drain line connected in the event of a malfunction.
The Flow-Thru is an evaporative humidifier and requires hot air. If not using hot air then hot water should be used. We see little humidity gain if our Flow-Thru humidifier is operating with cold air (and cold water). We run our blower on constant to best utilize our electronic air cleaner, but our humidifier is wired to only operate only when there is hot air and works very well. |
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The term By-Pass or Power refers to the driving force behind the air flow. The Power humidifier (aka Fan Power) uses a fan to draw the air thru the humidifier. The ByPass humidifier uses a 6" diameter duct that connects the supply to the return duct.
In the ByPass configuration the air leaving the furnace is routed back to the supply. The warm air leaving the furnace takes this short-cut of least resistance and bypasses the long trip down the duct work, in to the house, and back through the return. The ByPass is the 6" round duct work shown below. During the the hot humid A/C season the ByPass duct should be closed with the butterfly valve since the air flow through the humidifier would not be needed.
The Power humidifier uses a fan to draw air in from the duct and through the humidifier and exhausts back out in to the duct. The air is drawn in through duct at the center of the humidifier and back out in to the duct at the sides. The power humidifier should be mounted in vertical warm air flow.
The Model 400A, 500A, and 600A are ByPass humidifiers. The 700A is fan powered. |
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RP-700A
Aprilaire 700A Humidifer with Digital Humidistat
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RP-600A
Aprilaire 600A Humidifer with Digital Humidistat
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RP-500A
Aprilaire 500A Humidifer with Digital Humidistat
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RP-45
Aprilaire Water Panel for Model 400 Series 2-Pack
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RP-400
Aprilaire 400 Humidifer with Digital Humidistat
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