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
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 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 satisfiedto 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.
Width (including solenoid valve): 15 5⁄8”
Height (including drain spud): 13”
Depth: 101 ⁄4”
BYPASS DUCT OPENING
6” diameter
PLENUM OPENING
9 1 ⁄2”W x 9 1 ⁄2”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 500 | Model 500M |
DIGITALHUMIDIFIER |
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| MANUAL CONTROL |
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CONTROL |
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| IMPORTANT |
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| USE 120 VAC POWER SOURCE OTHER THAN FURNACE MOTOR |
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| ADHC TERMINAL STRIP |
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| CIRCUIT. HOWEVER, THE TRANSFORMER CAN BE POWERED |
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| OFF THE HOT 120 VAC LINE BEFORE IT ENTERS THE FURNACE. |
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| POWER |
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| OUTPUTS |
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| • DO NOT WIRE TRANSFORMER INTO FURNACE BLOWER CIRCUIT. |
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| R | C | A | B | ODT | W | G | H | H | Gf |
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NORTH, EAST |
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| 24 VAC FURNACE |
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OR WEST SIDE |
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| ACCESSORY TERMINALS |
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OF HOME |
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| OR TRANSFORMER |
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| (10VA MINIMUM) |
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| (SADDLE VALVE) |
OUTDOOR |
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| WATER SUPPLY |
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TEMPERATURE |
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SENSOR FOR |
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AUTOMATIC |
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MODE |
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| COMMON | YELLOW |
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| HI | 24V SOLENOID |
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| VALVE WIRES |
ABOVE EXPECTED |
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| LO |
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SNOW LINE |
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| YELLOW |
| FURNACE |
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| WIRES |
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| BLOWER MOTOR |
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| CONNECT DRAIN |
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| CONNECT TO |
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| LINE HERE |
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| HOT WATER SUPPLY |
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R | R |
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| MODEL 50 |
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| CURRENT |
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| CONNECT DRAIN LINE HERE | ||
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| SENSING RELAY | |
C |
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| 110 VAC |
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| (IF REQUIRED) |
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G | G |
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| IMPORTANT |
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| WHEN MODEL 50 CURRENT SENSING RELAY IS USED: |
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| Y |
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Y |
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| CONTINUOUSLY POWERED |
| • WIRE MODEL 50 CURRENT SENSING RELAY INTO |
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W | W |
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| 24 VAC TRANSFORMER |
| 24 VAC HUMIDIFIER CONTROL CIRCUIT ONLY! |
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| PROVIDED WITH HUMIDIFIER |
| DO NOT INSTALL IN TRANSFORMER PRIMARY CIRCUIT. |
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THERMOSTAT | FURNACE |
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RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI
INSTALLATION OPTIONS
The Model 500 and 500M Aprilaire can be
installedon 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 serviceabilitymust 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
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.
