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Model 400K*/400MK**
Bypass Unit –
Uses 100% of
MODEL
water and
evaporative
technology that
eliminates the
need for a drain.
CAPACITY
gpd = gallons per day
* = Automatic Digital Control (shown)
** = Manual Control For those rare occurrences where an automatic control is not practical, Aprilaire digital control can be installed in manual mode while still delivering the
accuracy and information you need for optimum performance.
Warranty – All Aprilaire models are warranted for five (5) years from date of installation for parts.
Heat Pumps – Plumbing the humidifier to hot water is recommended on all heat pump installations or if it is installed to operate independently of a call for heat.
(See ^NOTE for Model 400)
Structure Tightness
1000 ft
Tight
Average
Loose
*** = AHRI Air Conditioning, Heating, and Refrigeration Institute GPD = Gallons Per Day Guideline F
• A family of 4 will add 2 gallons of humidity per day through everyday activities like breathing, cooking, bathing and washing.
• Evaporative capacities assume blower is active 100% of the time, plenum temperature is at 120˚F and water is cold.
Easiest to Install
• Fully assembled
• Installation kit included with bypass units
• Installs in six easy steps
• Simple, annual maintenance
Aprilaire Selection Guide Specifications
Model 500K*/500MK**
Bypass Unit –
Designed for
smaller homes.
17 gpd
12 gpd
Humidifier Sizing Chart (8' Ceilings)
1500 ft
2
2
4.3
6.4
8.6
12.8
12.7
19.1
Model 600K*/600MK**
Bypass Unit –
Uses the furnace
blower to move
air through a
Water Panel
®
.
17 gpd
Bypass humidifiers can be installed on the supply or return plenum. Complete with install kit.
• Water feed rate for the Model 700, 350 and 360 is 6 gph; the Models 500 and 600 is 3 gph; Model 400 is .7 gph: Model 800 is .6 gph when connected to 120V, 1.1 gph when
connected to 208V and 1.18 gph when connected to 240V. (gph = gallons per hour)
2000 ft
2500 ft
2
2
Humidity needed (GPD per AHRI)*** Guideline F
8.5
10.6
17
21.3
25.5
31.8
Installation kit
included with
bypass units
Model 700*/700M**
Steam Humidifier –
For applications when
Powered Unit –
evaporative units
Built-in fan that
are less practical
pulls heated air
(attics, crawl spaces,
directly from
closets, milder winter
the furnace.
climates, non-forced
air heating source).
11.5 gpd
18 gpd
120 volts
3000 ft
4000 ft
2
2
12.7
17
25.4
34
38.1
51
www.AprilairePartners.com
Model 800
20.5 gpd
23.3 gpd
210 volts
240 volts
5000 ft
2
21.2
42.6
63.6
Form No. 261
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