Aprilaire 700, 700m User 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

G

Y

W

C

R

THERMOSTAT

R

C

W

Y

G

FURNACE

120 VAC OUTLET

BROWN WIRES

CONNECT DRAIN LINE HERE

110 VAC

CONNECT TO HOT WATER SUPPLY

OUTDOOR

TEMPERATURE

SENSOR FOR

AUTOMATIC MODE

NORTH, EAST

OR WEST SIDE

OF HOME

ABOVE EXPECTED

SNOW LINE

CONTINUOUSLY POWERED 24 VAC

TRANSFORMER PROVIDED WITH HUMIDIFIER

OUTPUTSINPUTSPOWER

GW

CRHHODT GfA

A

DHC TERMINAL STRIP

B

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEM PLATE BEFORE STARTING INSTALLATION

ATTENTION INSTALLER:

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.

T

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.

MODEL 700 SERIES HUMIDIFIER

WARNING

1. ELECTRICAL SHOCK HAZARD.

Disconnect electrical power to the
furnace before starting installation.

ailure to do so could result in serious

F
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.

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.

. Do not install humidifier on the furnace jacket.

2

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.

CAUTION

5. Do not connect the Model 700 or 700M power cord to multi­speed furnace blower motors or blower motors other than 120
VAC. Premature component failure may result. Use Research

roducts Corporation Model 50 Current Sensing Relay.

P

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.

RECOMMENDED WIRING DIAGRAMS

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

Model 700

DIGITAL HUMIDIFIER
CONTROL

SPECIFICATIONS

HUMIDIFIER DIMENSIONS

W

⁄32”

29

idth 15

Height (including solenoid valve

and drain spud)

Depth 10

18”

11

⁄32”

PLENUM OPENING

3

14

⁄4”W x 145⁄16”H

WATER FEED RATE

6 gph

ELECTRICAL DATA

120 VAC-60 Hz, 0.8 AMP

INSTALLATION OPTIONS

Typical Installation Alternate Installation

RETURN

SUPPLY

HOT WATER

RETURN

SUPPLY

Model 700M

MANUAL CONTROL

90-1514

Orientation of Aprilaire Model 700

and 700M to Cooling Coils

90-1208

RESEARCH PRODUCTS CORPORATION • P.O. BOX 1467 • MADISON, WI 53701-1467 • CALL 800/334-6011 • FAX [phone]

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

COOLING COILS IN

WARM AIR PLENUM

BLANKED OFF

END OF COIL

90-921

NOTES

1. Models 700 and 700M
are not suitable for
installation on ducts
with horizontal airflow.
Performance will be
reduced.

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

90-922

READ REVERSE SIDE FIRST! READ REVERSE SIDE FIRST!

6

7

12

5

2

3

1

16

4

18

9

14

11

10

8

13

15

17

– TOP –

READ COMPLETE SAF ETY INSTR UCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING INSTALLATION

URNISHED ITEMS

F

24 VAC Transformer

Digital Humidifier Control

(Model 700 only)

Manual Humidifier Control

(Model 700M only)

Humidifier Control

Installation Instructions

Saddle Valve

Humidifier Installation Template

Figure 1

Figure 2 Figure 3 Figure 4

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

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.

(if required)

90-923 90-924 90-925 90-926

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.

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.

PARTS LIST

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

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.

DIGITAL HUMIDIFIER CONTROL,
MODEL 700:

• Select location for control on return
duct. 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 control to duct
using 2 screws in openings provided.

• 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) is strongly
recommended 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.

8. Run 1/4” copper tubing from saddle

valve to solenoid valve. DOUBLE-WRENCH
TO PREVENT LEAKING. See Figure 4.

9. 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 over­tighten 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.

TEMPLATE MUST BE LEVEL

90-1244

and warranty information is given to owner in order to avoid unnecessary calls.
Warrantyis void unless humidifier is installed by qualified heating and air conditioning
contractor due to possible misapplication of product.

10008976 B2205118A 4.10

IMPORTANT! Be sure owner’s manual containing instructions for operation