Aprilaire 400 Series Setup guide

CONTINUOUSLY POWERED
24 VAC TRANSFORMER
PROVIDED WITH HUMIDIFIER
IMPORTANT
DO NOT WIRE TRANSFORMER
INTO FURNACE BLOWER CIRCUIT.
NORTH, EAST
OR WEST SIDE
OF HOME
ABOVE EXPECTED
SNOW LINE
WATER SUPPLY
SHUT-OFF
(SADDLE VALVE)
CONNECT DRAIN LINE HERE
YELLOW
WIRES
WHITE
WIRES
NOTE
DO NOT USE EXTERNAL
24 VAC OR 120 VAC SOURCE.
DAMAGE TO COMPONENTS
OF HUMIDIFIER CAN OCCUR.
OUTDOOR
TEMPERATURE
SENSOR OR
MANUAL MODE
RESISTOR
R C A B ODT CfW/G H
COMMON
24 VAC FURNACE
ACCESSORY TERMINAL
NOTE: IF 120V, INSTALL 24V TRANSFORMER.
24V ACTIVATED WITH HEAT CALL.
TERMINALS MAY BE LABELED: “HUM”, “ACC” OR “EAC”
CONSULT FURNACE MANUFACTURER FOR VOLTAGE AND
OPERATION PARAMETERS OF ACCESSORY TERMINALS.
NOTE: SEE CONTROL INSTRUCTIONS FOR OTHER WIRING OPTIONS.
READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING
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.
ATTENTION INSTALLER:
AUTOMATIC HUMIDIFIER MODEL 400A
The Model 400A 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 duct connections. The humidifier
dimensions and serviceability must be
considered when selecting the best location
for the humidifier. Here are 2 examples of
many types of installations.
RESEARCH PRODUCTSCORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX [phone]
RETURN
SUPPLY
RETURN
SUPPLY
Horizontal
Upflow
90-1205
90-1079
WARNING
1. ELECTRICAL SHOCK HAZARD.
Disconnect electrical power to the
furnace before starting installation.
Failure to do so could result in
serious injury from electrical shock.
2. SHARP EDGES HAZARD. Sharp
edges may cause serious injury from
cuts. Use care when making plenum
openings and handling ductwork.
3. RISK OF SCALDING. Water
temperature over 125°F can cause
severe burns and scald instantly.
Shut off the hot water supply before
disconnecting or tapping into any
hot water supply line.
SPECIFICATIONS
HUMIDIFIER DIMENSIONS
Width (including solenoid valve): 153⁄8Ó
Height (including drain spud): 153⁄4”
Depth:101⁄4”
BYPASS DUCT OPENING
6”diameter
PLENUMOPENING
10”W x 123⁄4”H
ELECTRICAL DATA
24 VAC-60 Hz, 0.5 AMP
CAUTION
1. Do not install humidifier where freezing temperatures
could occur. The water line could freeze and crack
causing water damage to the home.
2. Do not install humidifier or bypass connection on the
furnace jacket.
3. Do not install humidifier or bypass connection on a
plenum face where the blanked off ends of the cooling
coil will restrict air movement through the humidifier.
4. Do not set humidity level above recommended or to
recommended level if condensation exists on inside
windows of any unheated space, as condensation
damage may result. Excess humidity can cause
moisture accumulation which can allow the possibility
for mold growth in the home.
5. Do not connect Model 400A transformer to
blower motor wiring. Premature component
failure may result.
6. 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 Control.
7. Do not install humidifier where water pressure
exceeds 125 psi, since damage to the
humidifier may result. Follow codes in effect
concerning pressure reduction.
8. Do not install humidifier on systems with
greater than 0.4 in. wg pressure differential
between supply and return plenums.
RISK OF PROPERTY AND EQUIPMENT DAMAGE.
INSTALLATION
OPTIONS
RECOMMENDED WIRING DIAGRAM
(SEE STEP 7 ON BACK AND “HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS” FOR DETAILED WIRING INSTRUCTIONS)
Aprilaire Humidifier Parts Drawing 2007
The current Model 400 is identical to the previous Model 400A.

5
6
4
2
1
9
12
3
7
11
10
13
14
8
READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING
TEMPLATE MUST BE LEVEL
– TOP –
READ REVERSE SIDE FIRST! READ REVERSE SIDE FIRST!
IMPORTANT! Be sure owner’s manual containing
instructions for operation and warranty information is given to
owner in order to avoid unnecessary calls. Warranty is void unless
humidifier is installed by qualified heating and air conditioning
contractor due to possible misapplication of product.
1. Press top & bottom tabs
to remove cover (1).
Pull feed tube (3) out of
distribution tray (4). Remove
Water Panel®Evaporator
assembly. See Figure 1.
2. Humidifier is supplied
with bypass duct
connection on left. For right
side bypass, swap location
of water level sensor
assembly (9) and cap (10).
3. Position template on
supply or return plenum.
Make sure template is
level. Allow clearance for
drain line and for servicing.
Trace template outline.
Cut 10”wide x 12-3/4”
high opening. Avoid injury
from sharp edges.
4. Place humidifier base
(2) in opening and secure
with 6 screws in openings
provided.
5. Select location for 6”
collar on opposite plenum
to minimize length and
number of elbows in
bypass duct. Install 6”
bypass duct components.
Attach duct to humidifier
collar using 2 screws in
openings provided.
6. Insert Water Panel
Evaporator assembly into
base. Make sure bottom of
scale control insert (6) is
seated in water level sensor
assembly (9). Snap top of
evaporator assembly into
base. Insert feed tube into
distribution tray. See Figure 2.
Make sure float cover (14) is
snapped into place and that
floats (13) move freely up and
down. Rotate nameplate (11)
if necessary, so it is right side
up. Place point bypass damper
handle (8) to “WINTER”(open)
for heating season and
“SUMMER”for cooling
season.
NOTE: BEFORE LEAVING
THE JOB SITE, MAKE SURE:
1. Saddle valve is fully open.
2. All plumbing connections
are watertight.
3. Humidifier functions
properly.
4. Bypass damper is in
proper position.
Figure 1 Figure 2 Figure 3
10007290 B2204305B 09.07
90-1165 90-1068 90-1069
90-1263
7. Control installation and
wiring. Disconnect electrical
power to furnace before
wiring control. In order for
humidifier to operate,
furnace must be on and RH
must be below set-point of
control. Wiring diagram
illustrates recommended
method of detecting furnace
operation.
• Select location for control
on return duct at least 6”
upstream of bypass duct
connection or humidifier.
Position template on duct
and mark location of RH
sensor opening. Drill 3/4”
hole for sensor. Knob and
cover must be removed to
mount control. Place
control on duct with RH
sensor extending into duct
opening. Make sure gasket
is in place around sensor
cage. Secure humidistat to
duct using 2 screws in
openings provided.
• Control must be powered
by a continuous 24 V
source. See wiring diagram
on template and control
instructions for 24 V control
connections.
8. Humidifier will function
with cold, softened or
unsoftened water. Saddle
valve provided may be used
to tap into water supply.
See installation instructions
on saddle valve package.
Saddle valve is designed to
be fully opened or closed. Do
not use to regulate flow.
9. Run 1/4”copper tubing
from saddle valve to solenoid
valve. DOUBLE-WRENCH TO
PREVENT LEAKING. See
Figure 3.
10. Run 1/2”I.D. hose from
drain spud to floor drain.
Make sure drain has constant
downward slope and is not
kinked. Do not over-tighten
hose clamp onto drain spud.
Do not use solvent adhesive
on drain spud.
11. Check humidifier
operation. Open saddle valve
and turn control to highest
setting. Turn on furnace.
Make sure all electrical
connections are secure and
all plumbing connections are
water-tight. Set control to
proper setting.
1. Front Cover
2. Base
3. Feed Tube
4. Water Distribution Tray
5. Water Panel Evaporator
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
PARTS LIST
FURNISHED ITEMS
ITEMS NOT FURNISHED
Built-in bypass damper
24 VACTransformer
Automatic Digital Humidifier Control
Automatic Humidifier Control
Installation Sheet
Saddle valve
Humidifier Installation Template
Mounting screws (sheet metal screws)
Water supply line (1⁄4”copper)
Drain line (1⁄2”I.D. hose)
Low voltage wire
Bypass ductwork
Model 50 Current Sensing Relay
(if required)
For Aprilaire Humidifier Parts Drawing 2007, click here.