Parts List

READ REVERSE SIDE FIRST!

– TOP –

READ REVERSE SIDE FIRST!

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING INSTALLATION

FURNISHED ITEMS

Built-in bypass damper

24 VAC Transformer

Digital Humidifier Control

(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” copper)

Drain line (1⁄2” I.D. hose)

Low voltage wire

Bypass ductwork

Model 50 Current Sensing Relay (if required)

Figure 1

90-1067

Figure 2

90-1068

Figure 3

90-1069

1.Press top & bottom tabs to remove cover (1).

Pull feed tube (3) out of distribution tray (4). Remove Water Panel® Evaporator assembly. See Figure 1.

2.Humidifier is supplied with bypass duct connection on left. For right side bypass, swap location of drain spud (9) and cap (10). Twist to remove spud and cap.

3.Position template on supply or return plenum. Make sure template is level. Allow clearance for drain line and for servicing. Trace template outline. Cut 10” wide x 12-3/4” high opening.

Avoid injury from sharp edges.

4.Place humidifier base (2) in opening and secure with 6 screws in openings provided.

5.Select location for 6” collar

on opposite plenum to minimize length and number of elbows in bypass duct. Install 6” bypass duct components. Attach duct to humidifier collar using 2 screws in openings provided.

6.Insert Water Panel Evaporator assembly into base. Make sure bottom of scale control insert (6) is in drain spud. Snap top of evaporator assembly into base. Insert feed tube into distribution tray. See Figure 2. Rotate nameplate (11) if necessary, so it is right side up. Place point bypass damper handle (8) to “WINTER” (open) for heating season and “SUMMER” for cooling season.

7.Control installation and wiring. Disconnect electrical power to furnace before wiring control.

In order for humidifier to operate, furnace must be on and RH must be below set-point of control.

Wiring diagrams illustrate recommended method of detecting furnace operation.

MANUAL HUMIDIFIER CONTROL, MODEL 600M:

Manual Control can be mounted in return duct or on wall in living space. Knob and cover must be removed to mount control. See wiring diagram for 24V control connections.

•For return duct mounting, position template at least 6” upstream of bypass duct connection or humidifier.

Avoid injury from sharp edges when cutting opening. Make sure foam gasket is in place and secure control to duct using 2 screws in holes provided.

•For wall-mount, select location that will not be affected by drafts or heat sources. Remove and discard foam gasket and secure control to wall over wire access opening using screws & anchors provided.

DIGITAL HUMIDIFIER CONTROL, MODEL 600:

• Select location for control

on return duct at least 6”

upstream of bypass duct

connection or humidifier.

Drill 3/4” hole for sensor.

Knob and cover must be

8. Humidifier will function with

cold, hot, softened or unsoftened

water. Hot water (140°F max) is

stronglyrecommended to provide

maximum evaporative capacity.

Saddle valve provided may be

used to tap into water supply.

See installation instructions on

saddle valve package. Saddle

valve is designed to be fully

opened or closed. Do not use

to regulate flow.

9. Run 1/4” copper tubing from

saddle valve to solenoid valve.

DOUBLE-WRENCHTO PREVENT

LEAKING. See Figure 3.

10. INSTALL DRAIN IN

ACCORDANCE WITH LOCAL

CODES. Run 1/2” I.D. hose

from drain spud to floor drain.

Make sure drain has constant

downward slope and is not

kinked. Do not over-tighten

hose clamp onto drain spud.

Do not use solvent adhesive

on drain spud.

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

removed to mount control.

Place control on duct with

RH sensor extending into

duct opening. Make sure

gasket is in place around

sensor cage. Secure control

to duct using 2 screws in

openings provided.

• See wiring diagrams on

template and control

instructions for 24 V control

connections.

11. Check humidifier

operation. Open saddle valve

and turn control to highest

setting. Turn on furnace. Allow

humidifier to run until water

flows from drain. Make sure

all electrical connections are

secure and all plumbing

connections are water-tight.

Set control to proper setting.

NOTE: BEFORE LEAVING THE JOB SITE, MAKE SURE:

1.Saddle valve is fully open.

2.All plumbing connections are watertight.

3.Humidifier functions properly.

4.Bypass damper is in proper position.

90-1250	8	9

6
TEMPLATE MUST BE LEVEL	11
TEMPLATE MUST BE LEVEL

IMPORTANT! Be sure owner’s manual containing instructions for operation and warranty information is given to owner in orderto avoidunnecessary calls. Warranty is void unless humidifier is installed by qualified heating and air conditioning contractor due to possible misapplication of product.

10008975 B2205117A 4.10

600M specifications

Aprilaire is a leading brand in the field of indoor air quality, and its series of humidifiers like the 600A, 700M, 400A, 500A, and 600M have been designed for optimal performance and user convenience. These humidifiers are engineered to maintain ideal moisture levels in your home, which is especially important during dry winter months.

The Aprilaire 600A is an advanced model equipped with automatic humidity control. This feature enables the humidifier to adjust moisture levels based on the outdoor temperature, ensuring a comfortable indoor environment throughout the changing seasons. The 600A is also easy to install and integrates seamlessly with your home’s HVAC system, supplying humidity throughout the entire house.

In contrast, the 700M is a manual humidifier option that offers flexibility in controlling humidity levels. This model is particularly suitable for homeowners who prefer a hands-on approach. The 700M can deliver up to 0.75 gallons of moisture per hour, making it effective for larger homes or spaces where humidity needs to be closely monitored.

The Aprilaire 400A and 500A models are geared towards versatility and space efficiency. The 400A, designed for homes with lower humidity requirements, operates quietly and offers a less invasive installation. It is suitable for areas up to 4,000 square feet, making it ideal for many average-sized homes. The 500A, on the other hand, is particularly designed for homes with a higher demand for moisture, providing consistent humidity control for larger spaces.

The Aprilaire 600M is another manual option that combines a straightforward user interface with robust performance. Similar to the 700M, it allows users to manually adjust humidity levels but features a slightly superior output rate.

One of the standout characteristics shared among these models is their ability to minimize the effects of dry air. By maintaining the right humidity levels, these humidifiers help reduce the likelihood of respiratory issues, dry skin, and static electricity, along with protecting wooden furniture and flooring from damage.

Overall, the selection of Aprilaire humidifiers offers something for every homeowner, from automated models that take the guesswork out of humidity control to manual options that provide a personal touch. Each model boasts its unique features while ensuring a healthier and more comfortable living environment year-round.