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Honeywell H8908ASPST
Honeywell Manual Humidistat Color White
Price:$39.00
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Manual |
Automatic |
Automatic |
The H8908A Humidistat provides manual low voltage (24 vac) control of humidifiers, in central heating and air conditioning systems. The H8908A has a SPST, snap-acting, dust-proof switch and designed for wall or surface duct mounting.
Color: Empire White
Features
√ SPST, snap-acting, dust-proof switch
√ Positive ON and OFF settings
√ Twelve-inch ribbon of thin nylon ribbon
√ Mounts in duct or on wall surface
Product Specifications |
| Description |
Humidistat |
| Application |
Humidification |
| Type |
Humidity Control |
| Voltage |
24 Vac |
| Electrical Rating |
50 VA at 24 Vac |
| Color |
Empire White |
| Mounting |
Duct mount or wall mount |
| Differential |
10% RH |
| Temperature Range |
-20° F to +120° F
-30° C to +49° C |
| Operating Range |
10 to 60% RH |
| Dimensions (in.) |
4-7/8 in. high x 3¼ in. wide x 2 in. deep |
| Dimensions (mm) |
124 mm x 82.6 mm x 50.8 mm deep |
Manual Versus Automatic Humidistat
The indoor humidity level needs to be set based on the outside temperature. This is to prevent water from running down the windows. The cool air near the windows can not hold the humidity and water will condense on the glass. To prevent this condensation, the indoor humidity level is sacrificed by lowering the humidistat.
An automatic humidistat (Aprilaire 60) adjusts the humidity by using an outside temperature sensor.
The Aprilaire manual humidistat as used in earlier Aprilaire humidifiers (Model 4655) requires adjusting the relative humidity based on the outside temperature. A manual humidistat needs to be set back as the season gets colder. The chart below shows the humidity setting for a range of outside temperatures.
When The Outdoor
Temperature is |
This Relative Humidity
Should Be Maintained |
+40°F |
45% |
+30° |
40% |
+20° |
35% |
+10° |
30% |
0° |
25% |
-10° |
20% |
-20° |
15% |
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