MODEL 76 – EXTERNAL CONTROL OR CRAWL SPACE/SEALED ATTIC CONTROL AND WIRING
NOTE: Use
EXTERNAL CONTROL
Used as an external control, the Model 76 is mounted in the space that is to be dehumidified.. When the dehumidifier is powered, the display on the dehumidifier control will show “EXTERNAL” to indicate that an external control is being used.. External controls are recommended when the dehumidifier is installed in an attic and is ducted to the HVAC system..
The Model 76 uses a normally open (NO), dry contact (i..e.. not a triac or other semiconductor) relay to complete the circuit between the DH terminals of the dehumidifier control.. If using other controls such as a thermostat with dehumidification outputs, ensure the output is a dry contact type and set the NO/NC switch on the dehumidifier control (see Figure 20) to correspond with the control being used.. The Aprilaire Model 8620 Thermostat or Model 8910 Home Comfort Control are recommended alternate controls and both use normally open contacts..
If an external control is used in a zoned application, it must be located in the Primary Zone (refer to TWO ZONE – PRIMARY AND SECONDARY ZONED INSTALLATION on page 18 for details)..
CRAWL SPACE/SEALED ATTIC CONTROL
Used as crawl space or sealed attic control (or remote control), the Model 76 is mounted in the living space while the dehumidifier is located in the area to be dehumidified.. When the dehumidifier is powered, the display on the dehumidifier control will show “REMOTE” to indicate that a remote control is being used.. The RH shown on the Model 76 is the RH measured at the dehumidifier..
Remote control is typically used for crawl space or sealed attic applications, but is also recommended when the dehumidifier and the space being dehumidified are inconvenient or difficult for the homeowner to access.. Examples of this type of application include basements that may be inconvenient to access or storage areas..
FIGURE 20 – Model 76 External Control Wiring | ||||
NO/NC SWITCH |
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+ | - A B | ODT | VENT | DEH |
| Remote | Sensor | Dampers | |
NC NO |
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| Gh |
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| Rf Cf Gs W Y HVAC EQUIP. | |
FLOAT DHDH Switch |
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| MODEL 76 CONTROL |
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| A |
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| B |
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| C/- |
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| R/+ |
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| DH |
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| DH |
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FIGURE 21 – Model 76 Crawl Space/Sealed Attic (Remote) Wiring | ||||
+ | - A | B | ODT | Gh |
| Remote |
| Sensor | |
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| Rf Cf HVAC | ||
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| Gs W EQUIP. |
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| Y |
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| MODEL 76 CONTROL |
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| A |
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| B |
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| C/- |
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| R/+ |
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| DH |
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| DH |
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| 13 |