Aprilaire 400 Series User manual

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING
Attention Installer: WARNING This product must be installed by a qualified heating and air conditioning
contractor. Failure to do so, could result in serious injury from electrical
shock. This product must be installed in compliance with all local, state and federal codes.
AUTOMATIC HUMIDIFIER MODEL 400
The Model 400 Aprilaire can be installed on either the supply or return plenum of a forced air handling system and is easily reversible
for installation with right hand or left hand bypass pipe connections. Read complete instructions before mounting the humidifier.
The unit is 15" x 143/8" x 10". The dimensions and serviceability must be considered when selecting the best location for the unit.
WARNING
1. Disconnect electrical power to the furnace before starting
installation. Failure to do so could result in serious injury from
electrical shock.
2. Sharp edges may cause serious injury from cuts. Use care when
making plenum openings and handling ductwork.
3. Hot water temperatures in excess of 125°F. may cause serious
injury from burns. Make sure water supply is shut off before
connecting the water supply.
CAUTION
1. Do not install unit where freezing temperatures could occur.
2. Do not install unit or bypass connection on the furnace jacket.
3. Do not install unit or bypass connection on a plenum face where
the blanked off ends of the cooling coil restrict air movement
through the humidifier.
4. Do not set humidity higher than recommended. Condensation
damage may result.
5. Do not connect the transformer of the Model 400 to multi-speed
furnace blower motors or blower motors other than 120 VAC.
Premature component failure may result. Use Research Products
Corporation Model 50 Current Sensing Relay.
6. Do not set humidity up to recommended levels if there is
condensation on the inside windows of any unheated living
space. Condensation damage may result.
7. When installing Humidifier Control on downflow furnace, ensure
blower continues to run after a heat call is satisfied to eliminate
high temperatures from damaging the Humidifier Control.
8. Do not install humidifier where water pressure exceeds 125 psi,
since damage to the unit may result. Follow codes in effect
concerning pressure reduction.
NOTE: SIX (6) #8 X 3/4" PLATED HEX HEAD SMS SCREWS (NOT FURNISHED) ARE REQUIRED FOR INSTALLATION.
P.O. BOX 1467 • MADISON, WI 53701-1467 • Call 608/257-8801 • FAX [phone] • Products For Better Indoor Air Quality™
NOTE
SOME FURNACES ARE EQUIPPED WITH
ACCESSORY TERMINALS THAT CAN BE USED
FOR THE HUMIDISTAT. THE RP MODEL 50 CURRENT
SENSING RELAY (NOT FURNISHED) MAY NOT BE
NECESSARY IN THIS CASE. CONSULT THE FURNACE
MANUFACTURER’S RECOMMENDATIONS FOR WIRING.
NOTE
FOR INSTALLATION IN MANUAL
MODE, REPLACE OUTDOOR
TEMPERATURE SENSOR WITH
PLASTIC RESISTOR CASE AND
ATTACH MANUAL FACE PLATE.
SEE FORM #DP10005402 FOR
COMPLETE WIRING INSTRUC-
TIONS, INCLUDED WITH EACH
HUMIDIFIER.
IMPORTANT
WHEN MODEL 50 IS USED:
•DO NOT WIRE TRANSFORMER INTO
FURNACE BLOWER CIRCUIT.
•WIRE MODEL 50 INTO “APRILAIRE
HUMIDIFIER” CIRCUIT ONLY! DO NOT
INSTALL IN TRANSFORMER CIRCUIT.
Horizontal
Downflow
Upflow
COMMUNICATION
TERMINALS
FURANCE ACCESSORY
TERMINALS
(10 VA MINIMUM)
OR
TRANSFORMER
(10 VA MINIMUM)
NORTH, EAST
OR WEST
SIDE OF
HOME
OUTDOOR
TEMPERATURE
SENSOR
ABOVE EXPECTED
SNOW LINE
DO NOT USE
EXTERNAL
24 VAC OR
120 VAC
SOURCE.
DAMAGE TO
COMPONENTS
OF HUMIDIFIER
CAN OCCUR.
FURNACE
BLOWER
24 VAC
HIGH
LOW
MODEL
50 SHUT-OFF
(SADDLE VALVE)
WATER SUPPLY
COMMON
LEADS TO
APRILAIRE
TERMINALS
CONNECT SAFETY
OVERFLOW LINE HERE

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)
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
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
opening, install six #8 x 3/4" Plated
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.
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
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
valve using 1/4" O.D. copper tubing
(not furnished). DOUBLE WRENCH
TO PREVENT LEAKING! (See Figure 3)
9. Connect 1/2" I.D. plastic hose
(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.
Unpack the contents of the Model 400 box. Look at the drawing and parts list and make sure all the parts are present.
AUTOMATIC HUMIDIFIER MODEL 400
– TOP –
READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING
TEMPLATE MUST BE LEVEL
TEMPLATE MUST BE LEVEL DP NO. 10005802
READ REVERSE SIDE FIRST! READ REVERSE SIDE FIRST!
1
2
3
4
5
6
12
79
10
11
14
13
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
10.Hole Plug
11.Nameplate
12.Solenoid Valve
13.Float
14.Float Cover
8
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 3Figure 2
Figure 1