AprilAire 600 Series Large Bypass Evaporative Humidifier Installation Guide

: June 14, 2024
: Aprilaire

Table of Contents

AprilAire 600 Series Large Bypass Evaporative Humidifier
SPECIFICATIONS
PARTS LIST
INSTALLATION INSTRUCTIONS
MODEL 600 DIGITAL HUMIDIFIER CONTROL WIRING
CONTACT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

AprilAire 600 Series Large Bypass Evaporative Humidifier

AprilAire-600-Series-Large-Bypass-Evaporative-Humidifier-
PRODUCT

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 temperatures 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 least 6” 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 there is 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 the blower continues to run after a heat call is satisfied to eliminate high temperatures from damaging the humidifier control.
Periodically check the drain line to make sure water flows freely to the drain.

SPECIFICATIONS

Humidifier Dimensions

Width (including solenoid valve): 15-3/8”
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
Water Panel®: Model 35

FURNISHED ITEMS

Humidifier with a built-in bypass damper
24 VAC transformer
Automatic Digital Humidifier Control and Outdoor Temperature Sensor (Model 600 only)
Manual Humidifier Control (Model 600M 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 600 and 600M can be installed on either the supply plenum or cold air return of a forced air handling system 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.
Hot water is recommended (140°F max) for maximum evaporative capacity. It is also required when the Blower Activation Feature is 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.

AprilAire-600-Series-Large-Bypass-Evaporative-Humidifier-
FIG-1

PARTS LIST

Front Cover
Base
Feed Tube
Water Distribution Tray
Water Panel
Scale Control Insert
Bypass Damper
Damper Handle
Drain Spud
Hole Plug
Nameplate
Solenoid Valve

AprilAire-600-Series-Large-Bypass-Evaporative-Humidifier-
FIG-2

TEMPLATE MUST BE LEVEL

INSTALLATION INSTRUCTIONS

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

DRAIN LINE

Ensure a downward slope and no kinks.
Do not over-tighten the hose clamp onto the drain spud.
Do not use solvent adhesive on the drain spud.

MODEL 600 DIGITAL HUMIDIFIER CONTROL WIRING

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

AprilAire-600-Series-Large-Bypass-Evaporative-Humidifier-
FIG-13

MODEL 600M MANUAL CONTROL WIRING90

IMPORTANT: Use a 120 VAC power source other than the furnace blower circuit. However, the transformer can be powered off the hot 120 VAC line before it enters the furnace. Do not wire the transformer into the furnace blower circuit.

AprilAire-600-Series-Large-Bypass-Evaporative-Humidifier-
FIG-14

IMPORTANT: When Model 50 current sensing relay is used, wire Model 50 current sensing relay into 24 VAC humidifier control circuits only! Do not install it in the transformer’s primary circuit.

INSTALLATION CHECKLIST