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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
C
ONTINUOUSLY POWERED
2
4 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
CAB ODT CfW/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
T
his 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 COMPLE TE SAFETY INSTRUCTIONS AND INSTALL ATION 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.
F
ailure 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
W
idth 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
P
roducts 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.