Aprilaire 700 Installation Manual

Return

Supply

Return

Hot Water

Drain Line

Floor Drain
or Condensate
Pump

Supply

Drain Line

Floor Drain or
Condensate
Pump

Return

Supply

Hot Water

Drain Line

Floor Drain
or Condensate
Pump

Supply

Model 700 Series Humidifier Template

ATTENTION INSTALLER

Read this installation template before installing humidifier.
Warranty is void unless humidifier is installed by qualified
heating and air conditioning contractor due to possible
misapplication of product. This product must be installed in
compliance with all local, state, and federal codes. Proper
humidification and humidity control require that the home
be constructed with local codes and good building practices.

WARNING

ELECTRICAL SHOCK HAZARD. Disconnect power to the

furnace before installing humidifier.

CAUTION

SHARP EDGES. Use care when cutting and handling

ductwork.

HOT WATER CAN SCALD. Shut o hot water supply
before tapping into hot water supply.

NOTICE

FREEZING TEMPERATURES CAN BURST WATER PIPES.

Do not install humidifier where freezing may occur.

CONDENSATION DAMAGE OR MOLD CAN OCCUR.

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: 3 gph
Electrical Data: 24 VAC, 60 Hz, 0.8 Amp
Water Panel®: Model 35

FURNISHED ITEMS

• 24 VAC transformer

• Automatic Digital Humidifier Control and
Outdoor Temperature Sensor (Model 700 only)

• Manual Humidifier Control (Model 700M only)

• Humidifier Control Installation Instructions

• Saddle valve

• Humidifier Installation Template

ITEMS NOT FURNISHED

• Mounting screws (sheet metal screws)

• Water supply line (1/4" O.D. copper)

• Drain line (1/2" I.D. hose)

• Low voltage wire

• Model 50 current sensing relay (if required)

INSTALLATION OPTIONS

Aprilaire® Model 700 and 700M can be installed on either the supply plenum or cold air return of a forced air handling system. The humidifier dimensions and serviceability must be considered when
selecting the best location for the humidifier.

Hot water is recommended (140°F max) to provide maximum evaporative capacity. It is also recommended when the Blower Activation Feature is used with an Automatic Digital Humidifier Control, or
on a heat pump system. The humidifier functions with cold, hot, softened, or unsoftened water.

RECOMMENDED RECOMMENDED ALTERNATE

Return

Supply

Install humidifier
as shown in relation
to cooling coils

Drain Line

Floor Drain or
Condensate
Pump

Return

Supply

Drain Line

Floor Drain or
Condensate
Pump

Hot Water

Drain Line

Floor Drain
or Condensate
Pump

Return

90-2232

Locate return duct mounted humidifier control at least
6" upstream of humidifier, or fresh air intake for accurate
humidity sensing.

Locate wall mount humidifier control in areas
unaected by drafts or heat sources for accurate
humidity sensing.

Reduce the setting on the humidifier control if
condensation forms on windows or in unheated spaces.

EQUIPMENT DAMAGE MAY OCCUR.

Do not install humidifier on the furnace jacket.

Do not connect the power cord to multi-speed furnace
blower motors or blower motors other than 120 VAC.
Use Aprilaire Model 50 Current Sensing Relay. Do not
alter 120 VAC plug or hardwire the unit.

Do not install the humidifier on a plenum face at the
blanked end of the cooling coil.

If water pressure exceeds 125 psi, reduce water pressure
with devices allowed by local codes.

Do not use water with temperature greater than 140°F.

Do not install humidifier on systems with dierential
pressure greater than 0.4 w.g. between the supply and
return plenums.

When installing the humidifier control on the return duct
of a downflow furnace, ensure the blower continues to
run after a heat call is satisfied.

PARTS LIST

1. Front Cover

2. Base

3. Orifice Plate

4. Motor Mount Bridge

5. Scale Control Insert

6. Water Panel®

7. Water Distribution Tray

8. Fan Blade

9. Motor

10. Motor Mount Gasket

11. Relay

12. Power Cord

13. Strain Relief Bushing

14. Solenoid Valve

15. Connector Plug

16. Feed Tube

17. Nozzle

18. Relay Connector

19. Transformer

20. Strainer

21. Orifice

2

20

14

15

5

21

19

7

17

16

6

3

8

4

1

18

10

9

13

12

11

TEMPLATE MUST BE LEVEL

90-1436

Automatic Mode

Transformer Provided with Humidifier

Brown Wires

of cooling

INSTALLATION INSTRUCTIONS

7a7b7c861432

5

Level

Remove the
Water Panel®
evaporative assembly.

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

90-2296
90-923

OR

Cut opening using this template.

Template

Do not
position
opening
in front

coils.

90-2248

90-924

Position base in duct opening top-first

so hooks engage sheet metal at top.

Insert bottom of base and slide down

to engage hooks at bottom.

90-925

Rotate swing locks to

secure base to duct.

Secure base with screws.

90-926

Tighten water line by double wrenching.

MODEL 700 DIGITAL HUMIDIFIER CONTROL WIRING MODEL 700M MANUAL CONTROL WIRING

North, East

or West Side

of Home

Outdoor

Temperature

Sensor for

Above Expected

Snow Line

Location of manual humidifier control in living space.

NOTE: Control will display software revision level

i.e. r1, when the one minute test cycle has completed.
Refer to the control installation manual for system
checkout instructions.

R

C

G

Y

W

Thermostat or

Zone Panel

Equipment Terminals

R

C

G

Y

W

Furnace

90-1666

Locate manual or digital humidifier control on

the return at least 6" above the humidifier.

ADHC Terminal Strip

CR H HODT Gf

OUTPUTSINPUTSPOWER

GW

Continuously Powered 24 VAC

6"

120 VAC Outlet

Connect Drain Line Here

Connect to Hot Water Supply

120 VAC

90-2248 90-2248 90-2248

Locate manual or digital humidifier control

Completed installation.

on the return.

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

Brown Wires

90-1514

Terminals Or Transformer

(10VA Minimum)

Water 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

Shut-o

(Saddle Valve)

Drain Spud

Hose Clamp

Drain Line

Floor Drain or
Condensate
Pump

INSTALLATION
CHECKLIST

90-1208

Drain Line:

• Ensure
downward
slope and
no kinks.

• Do not over­tighten hose
clamp onto
drain spud.

• Do not use
solvent
adhesive on
drain spud.

  Saddle valve is

fully open.

  All plumbing

connections are
watertight.

  Unit is plugged

into 120 VAC
outlet.

  Humidifier

functions
properly.

  Owner’s manual

has been given
to homeowner.

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10008976 B2205118G 5.20

P.O. Box 1467
Madison, WI 53701-1467

800.334.6011 F: 608.257.4357

TEMPLATE MUST BE LEVEL