Aprilaire 500 SERIES Safety Instructions And Installation Template

RE D COMPLETE S FETY INSTRUCTIONS
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.
Proper humidification and humidity control also requires that the home be constructed in accordance with local codes and good building practices.

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.
(SEE STEP 7 ON BACK AND "HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS" FOR DETAILED WIRING INSTRUCTIONS)
Model 500
DIGITAL HUMIDIFIER
CONTROL
ADHC TERMINAL STRIP
POWER INPUTS
R C A B ODT
NORTH, EAST
OR WEST SIDE
OF HOME
OUTDOOR
TEMPERATURE
SENSOR FOR
AUTOMATIC
MODE
ABOVE EXPECTED
SNOW LINE
R
R
C
C
G
G
Y
Y
W
W
THERMOSTAT FURNACE
RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX 608/257-4357
ATTENTION INSTALLER:
This product must be installed in compliance with all local, state and federal codes.
MODEL 500 SERIES HUMIDIFIER
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.

RECOMMENDED WIRING DIAGRAMS

OUTPUTS
W G H H Gf
YELLOW
WIRES
CONNECT DRAIN
CONNECT TO LINE HERE
HOT WATER SUPPLY
110 VAC
CONTINUOUSLY POWERED
24 VAC TRANSFORMER
PROVIDED WITH HUMIDIFIER
ND INST LL TION TEMPL TE BEFORE ST RTING INST LL TION

CAUTION

5. Do not connect Model 500 or 500M 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 Humidifier 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.
Model 500M
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.
24 VAC FURNACE
ACCESSORY TERMINALS
OR TRANSFORMER
(10VA MINIMUM)
COMMON
HI
LO
FURNACE
BLOWER MOTOR
MODEL 50
CURRENT
SENSING RELAY
(IF REQUIRED)
IMPORTANT
WHEN MODEL 50 CURRENT SENSING RELAY IS USED:
• WIRE MODEL 50 CURRENT SENSING RELAY INTO
24 VAC HUMIDIFIER CONTROL CIRCUIT ONLY!
DO NOT INSTALL IN TRANSFORMER PRIMARY CIRCUIT.
90-1510
SHUT-OFF
(SADDLE VALVE)
WATER SUPPLY
YELLOW
24V SOLENOID
VALVE WIRES
CONNECT DRAIN LINE HERE
90-1207

SPECIFICATIONS

HUMIDIFIER DIMENSIONS
Width 15 ⁄ "
5
(including solenoid valve):
8
Height 13"
(including drain spud):
Depth 10 1 ⁄ "
:
4
BYPASS DUCT OPENING
6" diameter
PLENUM OPENING
9 1 ⁄ "W x 9 1 ⁄ "H
2 2
WATER FEED RATE
3 gph
ELECTRICAL DATA
24 VAC-60 Hz, 0.5 AMP

INSTALLATION OPTIONS

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
S
humidifier. Here are 2 examples of many
types of installations.
Upflow
SUPPLY
S
RETURN
Horizontal
R
RETURN
SUPPLY
90-1079
NOTE
When installing the Aprilaire humidifier
with the Aprilaire Digital Humidifier
Control or on a heat pump system, use
hot water. The heated water supplements
the reduced supply air temperature as
added heat for evaporation.