READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING

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.

LARGE FAN POWERED HUMIDIFIER MODEL 700M AND 700A

WARNING

1.

ELECTRICAL SHOCK HAZARD.

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.

Sharp edges may cause serious injury from cuts.

Use care when making plenum openings and handling ductwork.

3.

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.

CAUTION

RISK OF PROPERTY AND EQUIPMENT DAMAGE.

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

5. Do not connect the Model 700M or 700A power cord to multispeed furnace blower motors or blower motors other than 120

VAC. Premature component failure may result. Use Research

Products Corporation Model 50 Current Sensing Relay.

2. Do not install humidifier on the furnace jacket.

3. Do not install humidifier 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.

6. When installing Aprilaire Humidifier Control on a downflow furnace, ensure blower continues to run after a heat call is satisfied to eliminate high temperatures from damaging the

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 the supply plenum where static pressure exceeds 0.4 in. wg.

RECOMMENDED WIRING DIAGRAMS

(SEE STEP 6 ON BACK AND “HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS” FOR DETAILED WIRING INSTRUCTIONS)

Model 700M

MANUAL CONTROL

IMPORTANT

USE 120 VAC POWER SOURCE OTHER THAN FURNACE MOTOR

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.

24 VAC FURNACE ACCESSORY

TERMINALS OR TRANSFORMER

(10VA MINIMUM)

WATER SUPPLY

SHUT-OFF

(SADDLE VALVE)

INSTALLATION OPTIONS

Typical Installation

RETURN

SUPPLY

SPECIFICATIONS

HUMIDIFIER DIMENSIONS

Width 15 29 ⁄

32

”

Height (including solenoid valve and drain spud) 18”

Depth 10 11 ⁄

32

”

PLENUM OPENING

14 3 ⁄

4

”W x 14 5 ⁄

16

”H

WATER FEED RATE

6 gph

ELECTRICAL DATA

120 VAC-60 Hz, 0.8 AMP

Alternate Installation

HOT WATER

RETURN

SUPPLY

COMMON

HI

LO

FURNACE

BLOWER MOTOR

MODEL 50

CURRENT SENSING RELAY

(IF REQUIRED)

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.

120 VAC

OUTLET

CONNECT DRAIN LINE HERE BROWN WIRES

90-1208

Model 700A

AUTOMATIC DIGITAL

HUMIDIFIER CONTROL

R C A B ODT W/G Cf H

Orientation of Aprilaire Model 700M and 700A to Cooling Coils

BLANKED OFF

END OF COIL

NORTH, EAST

OR WEST SIDE

OF HOME

OUTDOOR TEMPERATURE

SENSOR OR MANUAL

MODE RESISTOR

ABOVE EXPECTED

SNOW LINE

CONTINUOUSLY POWERED

24 VAC TRANSFORMER

PROVIDED WITH HUMIDIFIER

IMPORTANT

DO NOT WIRE TRANSFORMER

INTO FURNACE BLOWER CIRCUIT.

WATER SUPPLY

SHUT-OFF

(SADDLE VALVE)

24 VAC FURNACE ACCESSORY TERMINAL

COMMON

CONSULT FURNACE MANUFACTURER FOR VOLTAGE AND

OPERATION PARAMETERS OF ACCESSORY TERMINALS.

TERMINALS MAY BE LABELED: “HUM”, “ACC” OR “EAC”

NOTE: IF 120V, INSTALL 24V TRANSFORMER.

24V ACTIVATED WITH HEAT CALL.

NOTE: SEE CONTROL INSTRUCTIONS FOR OTHER WIRING OPTIONS.

120 VAC OUTLET 90-1206

Aprilaire to be installed as shown in relation to cooling coils.

CONNECT DRAIN LINE HERE BROWN WIRES

RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX 608/257-4357

COOLING COILS IN

WARM AIR PLENUM

90-922

NOTES

1. Models 700M and 700A are not suitable for installation on ducts with horizontal airflow.

Performance will be reduced.

2. When installing Aprilaire humidifier on a heat pump system, use hot water. The heated water supplements the reduced supply air temperature as added heat for evaporation.

90-921

READ REVERSE SIDE FIRST!

– TOP – READ REVERSE SIDE FIRST!

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING

FURNISHED ITEMS

24 VAC Transformer

Manual Humidifier Control

(Model 700M only)

Automatic Digital Humidifier Control

(Model 700A 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

Model 50 Current Sensing Relay

(if required)

Figure 1

90-923

Figure 2

90-924

Figure 3

90-925

Figure 4

90-926

1.

Detach the cover assembly by lifting the latch at the bottom.

Remove the Water Panel ® evaporator assembly by grasping at top and tipping out. See Figure 1.

2.

Position template on supply plenum. Make sure template is level. Allow clearance for drain line and for servicing. See “Installation

Options” on opposite side for position relative to cooling coil.

2

15

Trace template outline. Cut 14-3/4” wide x 14-5/16” high opening. Avoid injury from sharp edges.

3.

Position base (2) in duct opening top-first so hooks engage sheet metal at top. See Figure 2. Insert bottom of base and slide down to engage hooks at bottom.

4.

Rotate swing locks to secure base to duct. See Figure 3. Fasten base to duct using 4 sheet metal screws in holes provided.

PARTS LIST

7

17

6

16

3

5.

Insert Water Panel Evaporator assembly into base. Make sure bottom of scale control insert (5) is over drain opening. Snap top of evaporator assembly into base.

6.

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.

1. Front Cover

2. Base

3. Orifice Plate

4. Motor Mount Bridge

5. Scale Control Insert

6. Water Panel Evaporator

7. Water Distribution Tray

8. Fan Blade

9. Motor

10. Motor Mount Gasket

11. Control Relay

12. Power Cord

13. Strain Relief Bushing

14. Solenoid Valve

15. Connector Plug

16. Feed Tube

17. Nozzle

18. Relay Connector Plug

14

5

12

13

8

4

11

18

10

9

MANUAL HUMIDIFIER CONTROL,

MODEL 700M:

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 in convenient location on duct.

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 over wire access opening using screws & anchors provided.

AUTOMATIC DIGITAL HUMIDIFIER

CONTROL, MODEL 700A:

• Select location for control on return duct. Position template on duct and mark location of RH sensor opening.

Drill 3/4” hole for sensor. Knob and cover must be 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 humidistat to duct using 2 screws in openings provided.

• Control must be powered by a continuous 24 V source. See wiring diagrams on template and control instructions for 24 V control connections.

7.

Humidifier will function with cold, hot, softened or unsoftened water. Hot water (140°F max) will 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.

8.

Run 1/4” copper tubing from saddle valve to solenoid valve. DOUBLE-

WRENCH TO PREVENT LEAKING.

See Figure 4.

9.

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.

10.

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.

IMPORTANT!

Be sure owner’s manual containing instructions for operation and warranty information is given to owner in order to avoid unnecessary calls.

Warranty is void unless humidifier is installed by qualified heating and air conditioning contractor due to possible misapplication of product.

TEMPLATE MUST BE LEVEL

90-1244

1

10007232 B2204272B 09.07