CIRCUIT. HOWEVER, THE TRANSFORMER CAN BE POWERED
OFF THE HOT 120 VAC LINE BEFORE IT ENTERS THE FURNACE.
PRIMARY CIRCUIT.
INTO FURNACE BLOWER CIRCUIT.
24V ACTIVATED WITH HEAT CALL.
OPERATION PARAMETERS OF ACCESSORY TERMINALS.
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:
LARGE BYPASS HUMIDIFIER MODEL 600M AND 600A
The Model 600M and 600A 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 PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX 608/257-4357
Horizontal
Upflow
90-1204
90-1207
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): 15
3
⁄8Ó
Height
(including drain spud): 15
3
⁄4”
Depth
: 10
1
⁄4”
BYPASS DUCT OPENING
6” diameter
PLENUM OPENING
10”W x 12
3
⁄4”H
WATER FEED RATE
3 gph
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 600M or 600A
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 DIAGRAMS
(SEE STEP 7 ON BACK AND “HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS” FOR DETAILED WIRING INSTRUCTIONS)
Model 600M
MANUAL CONTROL
Model 600A
AUTOMATIC DIGITAL HUMIDIFIER CONTROL
NOTE
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.
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