Aprilaire 850 Installation & Maintenance Instructions Manual page 5

InSTallaTIon InSTRUCTIonS
loCaTIon
(ConTInUeD)
The following guidelines are for a 120V installation in which the unit
discharges into a space with 70°F air temperature and 40% RH .
• Allow 4 feet of unobstructed space directly in front of the grille.
• Allow 2 feet on either side of the grille.
• Allow 1-1/2 feet above the grille.
See Figure 4 .
If the Model 800 Humidifier operates on 240V, allow an additional foot
of space between the grille and any obstruction or surface .
If the room temperature is less that 70°F, allow an additional 6" to
each distance for every two degree drop in temperature .
If the RH set point is higher than 45%, allow an additional foot of
space between the grille and any obstruction or surface .
Warmer room air temperature and RH below 35% will reduce the
amount of unobstructed space required to absorb discharged steam,
but the distances provided are recommended minimums .
noTe: If operating on 240V, condensation running through the steam
hose back into the canister may cause a gurgling noise . Install Tee &
Trap #4028 as shown in Figure 5 to divert condensation to drain to
eliminate gurgling noise .
(ConTInUeD)
FIGURe 4 – Minimum Clearances
FIGURe 5
Steam Hose
1" I.D.
(Downward
Slope from Tee
to Humidifier)
1-1/2 feet
minimum
to ceiling
2 feet
minimum to
side wall
4 feet
minimum to
objects in
front of grille
Maximize
Hose Clamp
Hose Clamp
Tee
Assembly
Steam
Humidifier
Hose
Clamp
Flared
End
Trap
Note: Prime with water
before using humidifier
Hose Clamp
Drain Hose
7/8" I.D.
90-1552
To Steam
Dispersion Tube
or Model 850
Fan Pack
Steam Hose, 1" I.D.
(Downward Slope to Tee)
#4028 KIT
CONTENTS:
Hose Clamps (5)
Steam
Trap (1)
Hose
Tee Assembly (1)
1" I.D.
Refer to Model
800 Installation
Manual for
additional
application
information.
5