READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING INSTALLATION
ATTENTION INSTALLER:
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.
Proper humidification and humidity control also requires that the home be constructed in accordance with local codes and good building practices.
MODEL 500 SERIES HUMIDIFIER
WARNING
CAUTION
SPECIFICATIONS
HUMIDIFIER DIMENSIONS
RISK OF PROPERTY AND EQUIPMENT DAMAGE.
1. ELECTRICAL SHOCK HAZARD.
Disconnect electrical power to the
furnace before starting installation.
Failure to do so could result in
Width (including solenoid valve): 155⁄8”
Height (including drain spud): 13”
Depth: 101⁄4”
1. Do not install humidifier where freezing temperatures
could occur. The water line could freeze and crack
causing water damage to the home.
5. Do not connect Model 500 or 500M transformer
to blower motor wiring. Premature component
failure may result.
serious injury from electrical shock.
2. Do not install humidifier or bypass connection on the
furnace jacket.
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 Humidifier Control.
BYPASS DUCT OPENING
6” diameter
2. SHARP EDGES HAZARD. Sharp
edges may cause serious injury from
cuts. Use care when making plenum
openings and handling ductwork.
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.
PLENUM OPENING
91⁄2”W x 91⁄2”H
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.
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.
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.
WATER FEED RATE
3 gph
8. Do not install humidifier on systems with
greater than 0.4 in. wg pressure differential
between supply and return plenums.
ELECTRICAL DATA
24 VAC-60 Hz, 0.5 AMP
RECOMMENDED WIRING DIAGRAMS
INSTALLATION OPTIONS
(SEE STEP 7 ON BACK AND “HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS” FOR DETAILED WIRING INSTRUCTIONS)
The Model 500 and 500M 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.
Model 500
Model 500M
DIGITAL HUMIDIFIER
CONTROL
MANUAL CONTROL
IMPORTANT
USE 120 VAC POWER SOURCE OTHER THAN FURNACE MOTOR
CIRCUIT. HOWEVER, THE TRANSFORMER CAN BE POWERED
OFF THE HOT 120 VAC LINE BEFORE IT ENTERS THE FURNACE.
• DO NOT WIRE TRANSFORMER INTO FURNACE BLOWER CIRCUIT.
R
C
A
B
ODT W/G Cf
H
24 VAC FURNACE
ACCESSORY TERMINALS
OR TRANSFORMER
(10VA MINIMUM)
Upflow
SHUT-OFF
(SADDLE VALVE)
SUPPLY
SHUT-OFF
(SADDLE VALVE)
CONTINUOUSLY POWERED
24 VAC TRANSFORMER
PROVIDED WITH HUMIDIFIER
WATER SUPPLY
WATER SUPPLY
RETURN
IMPORTANT
DO NOT WIRE TRANSFORMER
COMMON
INTO FURNACE BLOWER CIRCUIT.
YELLOW
24V SOLENOID
VALVE WIRES
YELLOW
24V SOLENOID
VALVE WIRES
HI
LO
NORTH, EAST
OR WEST SIDE
OF HOME
Horizontal
FURNACE
BLOWER MOTOR
RETURN
OUTDOOR
TEMPERATURE
SENSOR OR
MANUAL MODE
RESISTOR
MODEL 50
CURRENT
SENSING RELAY
(IF REQUIRED)
SUPPLY
CONNECT DRAIN LINE HERE
CONNECT DRAIN LINE HERE
90-1079
IMPORTANT
CONSULT FURNACE MANUFACTURER FOR VOLTAGE AND
OPERATION PARAMETERS OF ACCESSORY TERMINALS.
WHEN MODEL 50 CURRENT SENSING RELAY IS USED:
24 VAC FURNACE
ACCESSORY TERMINAL
NOTE
ABOVE EXPECTED
SNOW LINE
• WIRE MODEL 50 CURRENT SENSING RELAY INTO
24 VAC HUMIDIFIER CONTROL CIRCUIT ONLY!
DO NOT INSTALL IN TRANSFORMER PRIMARY CIRCUIT.
TERMINALS MAY BE LABELED: “HUM”, “ACC” OR “EAC”
When installing Aprilaire humidifier
on a heat pump system, use hot
water. The heated water supplements
the reduced supply air temperature
as added heat for evaporation.
NOTE: IF 120V, INSTALL 24V TRANSFORMER.
COMMON
NOTE: SEE CONTROL INSTRUCTIONS FOR OTHER
90-1204
90-1207
WIRING OPTIONS.
RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX 608/257-4357
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