
InSTallaTIon InSTRUCTIonS
(ConTInUeD)
GRIlle InSTallaTIon
Use the two 5/8” screws to attach the Model 850 grille to the fan housing and drywall. See
Figure 6
. If painting the grille is desired, see a
painting professional for acceptable paint products for high temperature (212°F), high humidity environments .
eleCTRICal WIRInG
Mount the Manual Humidistat in the area to be humidified
according to installation instructions included with control . Install the
humidistat in the same room or area as the Model 850 discharge, but at least ten feet away . Wire the Manual Humidistat to the Model 800
using standard 24 volt thermostat wire . See
Figure 8
.
Disconnect all power to Model 800 before wiring the Model 850 terminals to the FAN PACK terminals on the Model 800. Use standard 24 volt
thermostat wire . See
Figure 8
.
FIGURe 8 – Wiring Diagram for Manual Humidistat and Model 850
90-1816
FAN P
ACK
HUMIDIST
AT
TRANSFORMER
24V
COM
Model 65 Digital Control
4851 Bower Activation Relay
Tap Connectors
Circuit Board
Transformer
Model 850 Steam Humidifier Fan Pack
Aprilaire Model 800 Steam Humidifier
Continuous Powered
Transformer (24V)
H
H
R
C
24VAC
120VAC
24VAC
White/Yellow
White/Blue
Blue (NC)
Yellow (C)
Orange (NO
)
Cap
Not Used
7