Aprilaire 4655 Setup guide

English 1

Humidier

SAFETY AND INSTALLATION INSTRUCTIONS

Model 4655

Manual Humidier Control

THESE INSTALLATION INSTRUCTIONS

ARE FOR THE APRILAIRE® MANUAL

HUMIDIFIER CONTROL ONLY.

For AprilAire® Humidier installation, follow

AprilAire Humidier Installation Instructions.

B2204275B • 10007235 • 6.22

Product Info &

Digital Manual

2English

WARNING

ATTENTION INSTALLER: This product must be

installed by a qualied heating and air conditioning

contractor. Failure to do so could result in serious

injury from electrical shock.

1. 120 volts may cause serious injury from electrical

shock. Disconnect electrical power to the furnace

before starting installation.

2. Sharp edges may cause serious injury from cuts.

Use care when cutting plenum openings and

handling ductwork.

CAUTION

1. Do not set humidity higher than recommended.

Condensation damage may result.

2. Do not set humidity up to recommended levels

if there is condensation on the inside of windows

of any unheated living space. Condensation

damage may result.

3. Do not mount the Manual Humidier Control

on the supply plenum or duct. The unit cannot

withstand supply temperatures and will

malfunction.

4. Do not mount the Manual Humidier Control

downstream of the bypass outlet. False humidity

conditions will cause the humidier to operate

incorrectly.

English 3

TABLE OF CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

GENERAL INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

INSTALLING AND WIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

INSTALLATION TEMPLATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

INTRODUCTION

The Manual Humidier Control (Part 4655) is designed

for low voltage service to control humidication

equipment. An increase in relative humidity (RH)

expands the nylon ribbon which opens the control

switch to stop operation of the humidier. A decrease in

RH reverses the process and closes the control switch.

SPECIFICATIONS

RANGE 15% to 50%

OPERATIONAL DIFFERENTIAL 8% RH NOMINAL

DIMENSIONS (inches)

Length: 5-1/8”

Height: 3-3/8”

Depth: 1-15/16”

ELECTRICAL DATA

• SPST Switch

• 2 wires

• 24 volts A.C.

• Maximum load

(contacts) 5.2 amps

4English

LOCATION

The Control can be mounted on wall in living space or on

return duct.

WALL MOUNT

• Locate on an inside wall of living area approximately

5 feet above the oor.

• Do not locate control in the direct path of drafts from

open doors and windows.

• Do not install where operation might be affected

by lamps, sunlight, replace, registers, radiators,

concealed air ducts and pipes, or room occupants.

• The basic rules for location of thermostats also apply to

humidier controls.

DUCT MOUNT

Locate on the furnace return air plenum or duct, at least

6” upstream of the humidier, humidier bypass ductwork

(if applicable) or fresh air intake ductwork (if applicable).

GENERAL INSTRUCTIONS

• Do not mount the Humidier Control on counter ow

furnace. Furnace malfunction will result in improper

humidier operation.

• Be sure the Humidier Control is installed on a 24 VAC

circuit only.

• Make sure no bare wires are exposed or insulation

damaged.

• Make sure all splices are mechanically and electrically

secure.

• To remove dirt or other foreign matter from the nylon

ribbon and control interior, dust lightly with a ne soft brush.

English 5

INSTALLING AND WIRING

WALL INSTALLATION

1. Select location for the Humidier Control on an inside

wall. Mount the Humidier Control in a location where

low voltage wires from the furnace area are already

in place, or can be easily run.

2. Drill a 1/2” hole into the wall at the selected Humidier

Control location.

3. Pull low voltage wires from the furnace area and

through the hole in the wall. Before mounting the

Humidier Control, the hole in wall should be plugged

to prevent drafts affecting the Humidier Control

reading. All wiring should conform to the National

Electrical Code and local regulations.

4. (See FIGURE 1) Gently pull knob A from Humidier

Control cover B. Cover is held in place by snap clips.

Remove cover by pulling carefully. Do not touch the

sensing element.

5. Pull low voltage leads through opening in base

plate D.

6. Attach wires to terminal screws on Humidier Control.

(NOTE: If wires are “bunched” between Humidier

Control and wall, base plate may become warped or

cracked and calibration may be affected.)

7. Remove the gasket (not required for wall mount).

Attach base plate with humidistat switch to the

wall using two screws E and two wall anchors F, if

necessary.

8. Reassemble Humidier Control cover by snapping

back in place. Press on knob.

6English

ANCHOR F(x2)

SCREW E(x2)

BASE PLATE D

HUMIDISTAT SWITCH C

COVER B

KNOB A

BASE PLATE D

FIGURE 1 – WALL MOUNT

90-1228

English 7

DUCT (SHEET METAL) INSTALLATION

1. Select Humidier Control location on furnace return

air duct.

2. Use the attached template to mark the duct

opening.

3. Carefully cut the opening in the duct.

4. (See FIGURE 2) Gently pull knob A from Humidier

Control cover B. Cover is held in place by snap clips.

Remove cover by pulling carefully. Do not touch the

sensing element.

5. Run low voltage leads to control location. All wiring

should conform to the National Electrical Code and

local regulations.

6. Attach low voltage wires.

7. Make sure that the gasket G is in place. Use four

sheet metal screws H (not provided) to mount the

Humidier Control in the duct opening.

8. Reassemble Humidier Control cover, guiding the

low voltage wires through the cover side opening.

Press on knob.

8English

SCREW H

(x4)

INSIDE OF

RETURN

DUCT

GASKET G

BASE PLATE D

HUMIDISTAT SWITCH

COVER B

KNOB

RETURN DUCT

FIGURE 2 – SHEET METAL DUCT MOUNT

90-1229

English 9

DUCT (FIBER BOARD) INSTALLATION

1. Select Humidier Control location on furnace return

air duct.

2. Cut a rectangular hole in the duct board, no smaller

than 5-3/4 inches long by 3-3/4 inches wide.

3. Cut a rectangular piece of sheet metal to t behind

the hole in duct board for mounting the Humidier

Control.

4. Use the attached template to mark the sheet metal

opening for the Humidier Control.

5. Carefully cut the opening in the sheet metal.

6. (See FIGURE 3) Gently pull knob A from Humidier

Control cover B. Cover is held in place by snap clips.

Remove cover by pulling carefully. Do not touch the

sensing element.

7. Run low voltage leads to control location. All wiring

should conform to the National Electrical Code and

local regulations.

8. Attach low voltage wires.

9. Make sure that the gasket G is in place. Use four

sheet metal screws H (not provided) to mount the

Humidier Control in the sheet metal opening.

10. Reassemble Humidier Control cover, guiding the

low voltage wires through the cover side opening.

Press on knob.

11. Secure the sheet metal plate inside the duct.

10 English

KNOB A

SHEET METAL

PLATE

CUT OPENING IN

RETURN DUCT

RETURN

DUCT SHEET METAL

PLATE

RETURN DUCT

BASE PLATE D

COVER B

HUMIDISTAT SWITCH C

GASKET G

SCREW H

(x4)

INSIDE OF

RETURN

DUCT

FIGURE 3 – FIBER BOARD DUCT MOUNT

90-1230

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