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 600 SERIES HUMIDIFIER
WARNING
CAUTION
SPECIFICATIONS
HUMIDIFIER DIMENSIONS
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. Sharpedges may cause serious injury from cuts. Use care when making plenum openings and handling ductwork.
3.RISK OF SCALDING. Watertemperature 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.
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 600 or 600M 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.
Width (including solenoid valve): 15 3⁄8” Height (including drain spud): 15 3⁄4” Depth: 101 ⁄4”
BYPASS DUCT OPENING
6” diameter
PLENUM OPENING
10”W x 12 3⁄4”H
WATER FEED RATE
3 gph
ELECTRICAL DATA
24
RECOMMENDED WIRING DIAGRAMS
(SEE STEP 7 ON BACK AND “HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS” FOR DETAILED WIRING INSTRUCTIONS)
Model 600
DIGITAL HUMIDIFIER CONTROL
INSTALLATION
OPTIONS
The Model600 and 600M Aprilairecan be installed on eitherthe supplyor returnplenumof a forced air handlingsystemand is easilyreversiblefor installationwith righthand or left hand bypassduct
NORTH, EAST |
OR WEST SIDE |
OF HOME |
OUTDOOR TEMPERATURE |
SENSOR FOR |
AUTOMATIC MODE |
ADHC TERMINAL STRIP
| POWER |
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| OUTPUTS |
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| ODT W G |
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connections.The humidifierdimensionsand serviceabilitymust be consideredwhen selecting the best locationfor the humidifier.Here are
2 examplesof many typesof installations.
Upflow
SUPPLY
ABOVE EXPECTED |
SNOW LINE |
R
C
G
Y
W
THERMOSTAT
R
C
G
Y
W
FURNACE
YELLOW WIRES 
110 VAC |
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| CONNECT DRAIN | |
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| CONNECT TO | |||
| LINE HERE | |||
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| HOT WATER SUPPLY |
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CONTINUOUSLY POWERED
24 VAC TRANSFORMER
PROVIDED WITH HUMIDIFIER
RETURN 
Model 600M
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 |
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TERMINALS OR TRANSFORMER |
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| (10VA MINIMUM) | ||
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| (SADDLE VALVE) | |
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| WATER SUPPLY | |
COMMON |
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HI | MODEL 50 |
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CURRENT SENSING RELAY | YELLOW 24V | ||
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| (IF REQUIRED) | ||
LO | SOLENOID | ||
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| IMPORTANT | VALVE WIRES | |
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WHEN MODEL 50 CURRENT
FURNACESENSING RELAY IS USED:
BLOWER MOTOR
• WIRE MODEL 50 CURRENT |
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SENSING RELAY INTO 24 VAC |
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HUMIDIFIER CONTROL |
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CIRCUIT ONLY! DO NOT | |
INSTALL IN TRANSFORMER |
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PRIMARY CIRCUIT. |
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CONNECT DRAIN LINE HERE
Horizontal
RETURN
SUPPLY
NOTE
When installingthe Aprilairehumidifierwith the AprilaireDigital HumidifierControl or on a heat pump system, use hot water.The heated water supplementsthe reduced supply air temperatureas added heat for evaporation.
RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI
