AprilAire 700 SERIES - Manual

FURNACE

BLOWER MOTOR

24 VAC FURNACE ACCESSORY

TERMINALS OR TRANSFORMER

(10VA MINIMUM)

MODEL 50

CURRENT SENSING RELAY

(IF REQUIRED)

SHUT-OFF

(SADDLE VALVE)

WATER SUPPLY

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.

IMPORTANT

WHEN MODEL 50 CURRENT SENSING RELAY IS USED:

BROWN WIRES

120 VAC

OUTLET

• DO NOT WIRE TRANSFORMER INTO FURNACE BLOWER CIRCUIT.

• WIRE MODEL 50 CURRENT SENSING RELAY

INTO 24 VAC HUMIDIFIER CONTROL CIRCUIT
ONLY!

DO NOT INSTALL IN TRANSFORMER

PRIMARY CIRCUIT.

COMMON

HI

LO

CONNECT DRAIN LINE HERE

BROWN WIRES

120 VAC OUTLET

SHUT-OFF

(SADDLE VALVE)

WATER SUPPLY

CONNECT DRAIN LINE HERE

COMMON

24 VAC FURNACE ACCESSORY TERMINAL

OUTDOOR TEMPERATURE

SENSOR OR MANUAL

MODE RESISTOR

CONTINUOUSLY POWERED

24 VAC TRANSFORMER

PROVIDED WITH HUMIDIFIER

IMPORTANT

DO NOT WIRE TRANSFORMER
INTO FURNACE BLOWER CIRCUIT.

NORTH, EAST

OR WEST SIDE

OF HOME

ABOVE EXPECTED

SNOW LINE

R

C

A

B

ODT

Cf

W/G

H

NOTE:

IF 120V, INSTALL 24V TRANSFORMER.

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

CONSULT FURNACE MANUFACTURER FOR VOLTAGE AND
OPERATION PARAMETERS OF ACCESSORY TERMINALS.

NOTE:

SEE CONTROL INSTRUCTIONS FOR OTHER WIRING OPTIONS.

90-1206

90-1208

Model 700M

MANUAL CONTROL

Model 700

DIGITAL HUMIDIFIER CONTROL

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.

Proper humidification and humidity control also requires that the home be constructed in accordance with local codes and good building practices.

ATTENTION INSTALLER:

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING INSTALLATION

MODEL 700 SERIES HUMIDIFIER

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

INSTALLATION OPTIONS

Typical Installation

Alternate Installation

COOLING COILS IN

WARM AIR PLENUM

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

RECOMMENDED WIRING DIAGRAMS

(SEE STEP 6 ON BACK AND

“HUMIDIFIER CONTROL SAFETY AND INSTALLATION INSTRUCTIONS”

FOR DETAILED WIRING INSTRUCTIONS)

90-922

90-921

RETURN

RETURN

HOT WATER

SUPPLY

SUPPLY

Orientation of Aprilaire Model 700

and 700M to Cooling Coils

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.

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

CAUTION

1. Do not install humidifier where freezing temperatures

could occur. The water line could freeze and crack
causing water damage to the home.

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.

5. Do not connect the Model 700 or 700M power cord to multi-

speed furnace blower motors or blower motors other than 120
VAC. Premature component failure may result. Use Research
Products Corporation Model 50 Current Sensing Relay.

6. When installing 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.

RISK OF PROPERTY AND EQUIPMENT DAMAGE.

BLANKED OFF

END OF COIL

NOTES

1. Models 700 and 700M

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.