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RETURN

AIR

SUPPLY

AIR 

COOLING
COIL

HUMIDIFIER

FLUE

HUMIDIFIER

SUPPLY

AIR 

RETURN

AIR

COOLING COIL

SUPPLY AIR

RETURN AIR

OPTIONAL FLUE

NOT ALL MODELS

HUMIDIFIER

COOLING COIL

RETURN

AIR

SUPPLY

AIR 

COOLING
COIL

HUMIDIFIER

FLUE

120 VAC

TRANSFORMER

(FURNISHED)

24

VAC

WATER SUPPLY

CONNECT DRAIN LINE HERE  

SHUT-OFF

(SADDLE VALVE)

YELLOW 24 V

SOLENOID

VALVE WIRES

MANUAL

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.

If the furnace has central cooling, the humidifier bypass damper must be closed during the cooling season.

ATTENTION INSTALLER:

BYPASS HUMIDIFIER MODEL *HUMD200A

The humidifier can be installed on either the supply or return plenum of a forced

air handling system and is easily reversible for installation with right hand or 

left hand bypass duct connections. The humidifier dimensions and serviceability

must be considered when selecting the best location for the humidifier.

Downflow Furnace

Horizontal Furnace

Upflow Furnace

OPTION “A” REAR OF FURNA

C

OR REAR 

M

OUNT

Upflow Furnace

OPTION “B” FRONT OF FURNA

C

OR FRONT 

M

OUNT

IMPORTANT

U

S

E THE 120 VA

C

 POWER

S

OUR

C

E ON THE

INTEGRATED FURNA

C

E

C

ONTROL HU

M

IDIFIER

A

CC

E

SS

ORY TER

M

INAL

S

M

ARKED HU

M

-H, HU

M

-N 

TO POWER THE HU

M

IDIFIER

C

ONTROL TRAN

S

FOR

M

ER.

90-1104

90-1105

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.

S

harp

edges may cause serious injury from
cuts. Use care when making plenum
openings and handling ductwork.
Use personal protective equipment
when installing HVA

C

 equipment.

3. 

RISK OF SCALDING.

Water

temperature over 125°F can cause
severe burns and scald instantly.

S

hut off the hot water supply before

disconnecting or tapping into any
hot water supply line.

SPECIFICATIONS

HU

M

IDIFIER DI

M

EN

S

ION

S

Width 

(including solenoid valve):

15

5

8

Height 

(including drain spud):

13”

Depth

:

10

1

4

BYPA

SS

 DU

C

T OPENING

6” diameter

PLENU

M

 OPENING

9

1

2

”W x 9

1

2

”H

WATER FEED RATE

3 gph

ELE

C

TRI

C

AL DATA

24 VA

C

-60 Hz, 0.5 A

M

P

CAUTION

1. Do not install humidifier in attic or crawl areas.

2. Do not install humidifier where freezing temperatures

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

3. Do not install humidifier or bypass connection on the

furnace cabinet.

4. Do not install humidifier or bypass connection on a

plenum face where the blanked off ends of the cooling
coil will restrict air movement through the humidifier.

5. 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 your home.

6. Do not connect humidifier transformer to

blower motor wiring. Premature component
failure may result.

7. When installing 

M

anual Humidifier 

C

ontrol on

downflow furnace, ensure blower continues to
run after a heat call is satisfied to eliminate
high temperatures from damaging the 

C

ontrol.

8. Do not install humidifier where water pressure

exceeds 125 psi, since damage to the
humidifier may result. Follow codes in effect
concerning pressure reduction.

9. Do not install humidifier on the supply plenum

where static pressure exceeds 0.2" W.

C

.

RISK OF PROPERTY AND EQUIPMENT DAMAGE.

INSTALLATION OPTIONS

WIRING DIAGRAM

*May be “A” or “T”

IMPORTANT

NOTE:

THE INTEGRATED FURNA

C

C

ONTROL HA

S

 OPTIONAL

A

CC

E

SS

ORY 

C

ONNE

C

TION

S

 FOR THE HU

M

IDIFIER. 

S

EE THE

FURNA

C

E IN

S

TALLER’

S

 GUIDE FOR THE 

SC

HE

M

ATI

C

 DIAGRA

M

OF THE FURNA

C

E AND THE FIELD WIRING DIAGRA

M

 FOR THE

OPTIONAL A

CC

E

SS

ORIE

S

.

NOTE:

FOR 

C

O

MM

UNI

C

ATING 

S

Y

S

TE

M

WIRING DIAGRA

MS

S

EE EN

C

LO

S

ED

IN

S

TALLER’

S

 GUIDE, FOR

M

 18-HE87D1-1.

TEMPLATE MUST BE LEVEL

Trane

6200 Troup Highway

Tyler, TX 75711-9010

READ COMPLETE SAFETY INSTRUCTIONS, PRE-INSTALLATION SETUP AND CHECKOUT PROCEDURE

FOR BYPASS HUMIDIFIER AND INSTALLATION / TEMPLATE INSTRUCTIONS BEFORE STARTING

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