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READ REVERSE SIDE FIRST!
READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING
Unpack the contents of the Model 400 box. Look at the drawing and parts list and make sure all the parts are present.
1.
Remove front cover by pressing
center tabs on top and bottom of the
cover (1) and base (2). Pull feed tube
(3) out of water distribution tray
(4). Lift the Water Panel Evaporator
assembly out of the base. (See
Figure 1)
2.
The unit comes assembled for
left side discharge. If converting to
right side discharge, the base can
be rotated so round collar is facing
to the right. Remove hole plug (10)
10
12
3
2
7
8
9
6
1. Front Cover
2. Base
3. Feed Tube
4. Water Distribution Tray
5. Water Panel
6. Scale Control Insert/Float Chamber
7. Integral Damper
8. Damper Handle
9. Water Level Sensor Assembly
TEMPLATE MUST BE LEVEL
AUTOMATIC HUMIDIFIER MODEL 400
Figure 1
by twisting and pushing out.
Remove two screws holding water
level sensor assembly (9) and lift.
On back of sensor assembly (9),
move wires from right side retaining
clip to left side retaining clip.
Reinstall sensor assembly and hole
plug on opposite sides of base (2).
Press wires back into slot inside
base (2).
3.
Using a level, position this tem-
plate at least 3" above the furnace
4
5
14
13
10. Hole Plug
11. Nameplate
12. Solenoid Valve
13. Float
14. Float Cover
TEMPLATE MUST BE LEVEL
– TOP –
housing or cooling coil, if applica-
ble, for clearance of the safety
overflow line. Trace around template
edges. Remove it and cut the
plenum opening.
Place the unit into the plenum
3
opening, install six #8 x
/
" Plated
4
Hex Head SMS screws (not
furnished) at the top and sides of
the unit interior.
4.
Install a 6" collar in a convenient
location on the opposite plenum.
11
1
READ REVERSE SIDE FIRST!
Figure 2
Attach a 90° elbow and measure
the length of 6" round duct
required to make the connection.
Attach duct with sheet metal
screws. Support bypass duct in
excess of 4' to prevent sagging.
5.
Re-install the Water Panel
Evaporator assembly back into the
base, making sure the bottom of
the water panel assembly is prop-
erly seated on the sensor assembly.
Make sure both float stems extend
through openings in float cover and
that floats move freely up and
down. Push the feed tube back into
the water distribution tray. (See
Figure 2) If the nameplate in the
cover (11) is upside down, remove it
by gently squeezing the tabs of the
nameplate from inside the cover
and pushing out. Rotate the name-
plate so it is right side up, and snap
back into place. Put the front cover
back on. Turn damper handle (8), to
the open position "winter" for the
heating season or closed position
"summer" for the cooling season.
6.
Install the Aprilaire Humidifier
Control in the return air duct using
the installation instructions
enclosed. See reverse side for
wiring diagram. For detailed
installation and wiring instructions
see form #DP 10005402, included
with humidifier.
Wire 24 VAC transformer to
power source other than furnace
fan motor circuit. Transformer can
be powered off the 120 VAC line
at the junction box before it enters
IMPORTANT!
Be sure warranty card and owner's manual
containing instructions explaining operation of unit are given to
owner in order to save unnecessary calls. Warranty card should
be filled out and sent to factory immediately following installation.
Warranty is void unless unit is installed by qualified heating and air
conditioning contractor due to possible misapplication of product.
Figure 3
furnace or from 120 VAC furnace
accessory terminals. See furnace
manufacturer's recommendations
for wiring.
7.
Tap into a water supply line with
the saddle valve furnished. The
humidifier will function with cold,
hot, softened, or unsoftened water.
NOTE: The saddle valve is designed
to be fully opened or closed. Do not
use it to regulate water flow.
8.
Connect tubing from the saddle
valve to the inlet side of the solenoid
1
valve using
/
" O.D. copper tubing
4
(not furnished). DOUBLE WRENCH
TO PREVENT LEAKING! (See Figure 3)
9.
1
Connect
/
" I.D. plastic hose
2
(not furnished) to safety overflow
line connection at base of unit
and direct to floor drain. Be sure
hose has continuous slope.
NOTE: Do not sweat or directly
attach metal line to fitting. Do not
use solvent type adhesive when
connecting plastic hose, since
damage to fitting could result.
10.
Open saddle valve completely
and turn on furnace. Check to see
if unit is water tight and all electri-
cal components function properly
by utilizing humidification system
check out section of Aprilaire
Humidifier Control Installation
Instructions, form #DP 10005402.
NOTE: Both floats must be at bottom
of float chamber for humidifier to
operate, even in test mode.
DP NO. 10005802
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