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HUMIDIFIER
Do not mount humidifier in a location where ambient temperature
exceeds 120ºF or where freezing temperatures may occur.
Mount humidifier in a location that allows access for servicing, and
clearance to remove front panel for replacing the canister and side
panel for access to the electrical components during installation.
See Figure 6 for minimum clearances around humidifier.
The humidifier should be mounted as close to the dispersion
tube as possible. Table 3 shows how capacity is reduced as the
distance between the humidifier and dispersion tube increases. If
the humidifier is mounted on the duct directly below the dispersion
tube, allow space for a bend in the steam hose.
The humidifier can be mounted to a wood surface, or to sheet metal
ductwork if it is structurally stable. Do not mount humidifier to fiber
duct board.
The humidifier must be mounted to a vertical surface and must be
mounted level in the upright position.
Do not mount humidifier near sources of electromagnetic emissions
such as power distribution transformers.
ADHC (AUTOMATIC DIGITAL HUMIDIFIER CONTROL) MODEL 62
The ADHC must be mounted in the return air duct at least 6” upstream of any fresh air intake ducts or sources of moisture (steam dispersion
tube if it is in the return.) Follow instructions provided with the control.
If the application requires a wall-mounted control in the conditioned space, use Aprilaire Part #4993, which includes a wall-mountable manual
humidistat, a relay to activate the HVAC blower, and wiring instructions.
16" for
Steam
Hose
30" for
Service
Access
16" for
Electrical
Access
4"
16"
for Drain
FRONT VIEW
SIDE VIEW
FIGURE 6 – Clearances
90-1519
INSTALLATION INSTRUCTIONS (CONTINUED)
FIGURE 5
90-1527
Steam Hose
Dispersion Tube
Steam Hose
1-1/2" Hose Clamp
1-1/2" Hose Clamp
1" Copper Pipe
3/4" x 1" Reducing Coupling
Humidifier
7