Aprilaire 400 Safety And Installation Instructions

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.
WARNING
ELECTRICAL SHOCK HAZARD.
1.
Disconnect electrical power to the
furnace before starting installation.
Failure to do so could result in
serious injury from electrical shock.
SHARP EDGES HAZARD.
2. Sharp
edges may cause serious injury from
cuts. Use care when making plenum
openings and handling ductwork.
RISK OF SCALDING.
3. 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.
RECOMMENDED WIRING DIAGRAM
(SEE STEP 7 ON BACK AND "HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS" FOR DETAILED WIRING INSTRUCTIONS)
R C A
CONTINUOUSLY POWERED
24 VAC TRANSFORMER
PROVIDED WITH HUMIDIFIER
IMPORTANT
DO NOT WIRE TRANSFORMER
INTO FURNACE BLOWER CIRCUIT.
NORTH, EAST
OR WEST SIDE
OF HOME
OUTDOOR
TEMPERATURE
SENSOR OR
MANUAL MODE
RESISTOR
24 VAC FURNACE
ACCESSORY TERMINAL
ABOVE EXPECTED
SNOW LINE
RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX 608/257-4357
The current Model 400 is identical to the previous Model 400A.
ATTENTION INSTALLER:
This product must be installed in compliance with all local, state and federal codes.
AUTOMATIC HUMIDIFIER MODEL 400A
RISK OF PROPERTY AND EQUIPMENT DAMAGE.
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.
B ODT W/G Cf H
WATER SUPPLY
CONSULT FURNACE MANUFACTURER FOR VOLTAGE AND
OPERATION PARAMETERS OF ACCESSORY TERMINALS.
TERMINALS MAY BE LABELED: "HUM", "ACC" OR "EAC"
COMMON
NOTE: IF 120V, INSTALL 24V TRANSFORMER.
24V ACTIVATED WITH HEAT CALL.
NOTE: SEE CONTROL INSTRUCTIONS FOR OTHER WIRING OPTIONS.
Aprilaire Humidifier Parts Drawing 2007
CAUTION
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.
SHUT-OFF
(SADDLE VALVE)
YELLOW
WIRES
WHITE
WIRES
NOTE
DO NOT USE EXTERNAL
24 VAC OR 120 VAC SOURCE.
DAMAGE TO COMPONENTS
OF HUMIDIFIER CAN OCCUR.
CONNECT DRAIN LINE HERE
90-1205

SPECIFICATIONS

HUMIDIFIER DIMENSIONS
Width 15
(including solenoid valve):
Height 15
(including drain spud):
Depth 10 1 ⁄ "
:
4
BYPASS DUCT OPENING
6" diameter
PLENUM OPENING
10"W x 12 3 ⁄ "H
4
ELECTRICAL DATA
24 VAC-60 Hz, 0.5 AMP
INSTALLATION
OPTIONS
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.
Upflow
SUPPLY
RETURN
Horizontal
RETURN
SUPPLY
3 ⁄ Ó
8
3 ⁄ "
4
90-1079