AprilAire 500 Series Small Bypass Evaporative Humidifier Installation Guide

: June 14, 2024
: Aprilaire

Table of Contents

500 Series Small Bypass Evaporative Humidifier
SPECIFICATIONS
FURNISHED ITEMS
ITEMS NOT FURNISHED
INSTALLATION OPTIONS (LEFT HAND DISCHARGE SHOWN)
PARTS LIST
INSTALLATION INSTRUCTIONS
MODEL 500 DIGITAL HUMIDIFIER CONTROL WIRING
MODEL 500M MANUAL CONTROL WIRING
Documents / Resources

INSTALLATION TEMPLATE
SUPPLY
500 Series
Small Bypass
**Evaporative Humidifier

**

500 Series Small Bypass Evaporative Humidifier

WARNING

ATTENTION INSTALLER: Read this manual before installing.
Improper installation or maintenance may cause property damage or injury. It is recommended that installation, service, and maintenance be performed by a trained service technician. This product must be installed in compliance with all local, state, and federal codes.
ELECTRIC SHOCK HAZARD: 120 volts may cause serious injury from electric shock. Disconnect electrical power to the HVAC system and humidifier before starting installation or servicing. Leave power disconnected until installation/ service is completed.
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.
Avoid obstructions such as plumbing or electrical wires when cutting into walls.

CAUTION

SHARP EDGES MAY CAUSE INJURY FROM CUTS. Use care when cutting plenum openings and handling ductwork. Always wear glasses/goggles and gloves when installing the unit.
Dropping may cause personal injury or equipment damage.Handle with care and follow installation instructions.

NOTICE

FREEZING TEMPERATURES CAN BURST WATER PIPES.

Do not install the humidifier where freezing may occur. The water line could freeze and crack causing water damage to the home.

CONDENSATION DAMAGE OR MOLD CAN OCCUR.

Position the return duct mounted humidifier control at least6” upstream of the humidifier, bypass duct connection, or fresh air intake for accurate humidity sensing.
Position the wall-mounted humidifier control in areas unaffected by drafts or heat sources for accurate humidity sensing.
Lower the humidity setting on the humidifier control if thereis excess condensation on the inside of any windows in unheated living spaces.

EQUIPMENT DAMAGE MAY OCCUR IF INSTALLATION INSTRUCTIONS ARE NOT FOLLOWED.

Do not install the humidifier or bypass connection on the furnace jacket.
Do not connect the transformer to the blower motor wiring.
Do not install the humidifier or bypass connection on a plenum face at the blanked end of the cooling coil.
If water pressure exceeds 125 psi, reduce water pressure with devices allowed by local codes.
Use hot water with a temperature no greater than 140°F (60°C).
Do not install the humidifier on systems with differential pressure greater than 0.4” w.c. between the supply and return plenums.
When installing the humidifier control on the return duct of a downflow furnace, ensure blower continues to run after a heat call is satisfied to eliminate high temperatures from damaging the humidifier control.
Periodically check drain line to make sure water flows freely to drain.

SPECIFICATIONS

Humidifier Dimensions:
Width (including solenoid valve): 15-5/8”
Height (including drain spud): 13”
Depth: 10-1/4”
Bypass Duct Opening: 6” diameter
Plenum Opening: 9-1/2”W x 9-1/2”H
Water Feed Rate: 3 gph
Electrical Data: 24 VAC, 60 Hz, 0.5 Amp
Water Panel®: Model 10

FURNISHED ITEMS

Humidifier with built-in bypass damper
24 VAC transformer
Automatic Digital Humidifier Control and Outdoor Temperature Sensor (Model 500 only)
Manual Humidifier Control (Model 500M only)
Humidifier Control Installation Instructions
Saddle valve
Humidifier Installation Template

ITEMS NOT FURNISHED

Mounting screws (sheet metal screws)
Water supply line (1/4” O.D. copper
Drain line (1/2” I.D. hose)
Low voltage wire (18-22 gauge)
Bypass ductwork
Model 50 current sensing relay (if required)

INSTALLATION OPTIONS (LEFT HAND DISCHARGE SHOWN)

AprilAire Model 500 and 500M can be installed on either the supply plenum or coldair return of a forced air handling system with right hand or left hand bypass duct connections. The humidifier dimensions andserviceability must be considered when selecting the best location for the humidifier Hot water is recommended (140°F max) for maximum evaporative capacity. It is also required when the Blower Activation Featureis used with an Automatic Digital Humidifier Control or when mounted on a heat pump system. The humidifier functions with cold, hot, softened, or unsoftened water.

PARTS LIST

1. Front Cover	7. Bypass Damper
2. Base	8. Damper Handle
3. Feed Tube	9. Drain Spud
4. Water Distribution Tray	10. Hole Plug
5. Water Panel	11. Nameplate
6. Scale Control Insert	12. Solenoid Valve

INSTALLATION INSTRUCTIONS

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Press tabs to remove cover.| Pull feed tube out of distribution tray, and remove Water Panel evaporative assembly.
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Cut opening using this template.| Secure base with screws.
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Insert feed tube into distribution tray.| Turn damper handle to WINTER when in use.
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Tighten water line by double wrenching.| Location of manual humidifier control in living space.
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Locate manual or digital humidifier control on the return 6” above the humidifier or bypass duct.| Completed installation.

MODEL 500 DIGITAL HUMIDIFIER CONTROL WIRING

NOTE : Control will display software revision level, e.g., r3, when the one minute test cycle has completed. Refer to the control installation manual for system checkout instructions.

MODEL 500M MANUAL CONTROL WIRING

IMPORTANT : Use 120 VAC power source other than furnace blower 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.

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.

INSTALLATION CHECKLIST

Saddle valve is fully open.
All plumbing connections are watertight.
Humidifier functions properly.
Bypass damper is in proper position.
Owner’s manual has been given to homeowner.

TEMPLATE MUST BE LEVEL
B2205116F • 10008974 • 08.23
© 2023 AprilAire |aprilairepartners.com | 800.334.6011
AprilAire reserves the right to change specifications without notice.

Documents / Resources

| AprilAire 500 Series Small Bypass Evaporative Humidifier [pdf] Installation Guide
500 Series Small Bypass Evaporative Humidifier, 500 Series, Small Bypass Evaporative Humidifier, Bypass Evaporative Humidifier, Evaporative Humidifier, Humidifier
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