Honeywell H8908C, H8908B User Manual

APPLICATION

Humidity Control

Régulateur d'humidité

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M13371

CASE REMOVAL
SLOT

HOLE FOR WIRING
THE DUCT MOUNTING
INSTALLATIONS

The H8908B Humidistat and H8908C Deh um idi stat
(humidity controllers) provide automatic low voltage
control of humidifiers and dehumidifiers or venti lator s,
respectively, in central heating and air conditioning sys­tems. They have a spst, snap-acting, dust-proof switch
and are designed for wall or surface duct mounting.

INSTALLATION

When Installing this Product...

Read these instructions carefully. Failure to follow

1.

them could damage the product or cause a haz­ardous condition.
Check the ratings given in the instructions and on

2.

the product to make sure the product is suitable
for your application.
Installer must be a trained, experienced service

3.

technician.
After installation is complete, check out product

4.

operation as provided in these instructions.

CAUTION

Personal Injury Hazard.
Power supply can cause electrical shock.

Disconnect power supply before beginning
installation.

Location and Mounting

The styling of the H8908 is designed to blend with the
latest T8600 family of Honeywell Chronother m ® IV
Deluxe Programmabl e Thermostat s . A mounting tem­plate is included for mounting the H8908 next to the
T8600. The H8908 can also be mounted at any other
convenient location in the living area or equipment
room. See Fig 1.

NOTE: The H8908 electrical connections are not

shared with the thermostat.

H8908B Humidistat

H8908C Dehumidistat

INSTALLATION INSTRUCTIONS

Fig. 1. H8908B Humidistat.

Wall Mounting

IMPORTANT

Mount the control in an area with average
room temperature and average relative
humidity.

The following mounting instructions are for mounting
the H8908 on the wall next to the T8600. When install­ing the H8908 at another location, modify the procedure
to fit the installation.

Hold the mounting template (included) next to the

1.

T8600. Select the mounting side for the H8908.
The template is rever sib le f o r moun ting on either
the left or right side of the T8600. See Fig. 2.
Mark the holes for the two mounting screws

2.

(included). Then mark the hole for the low voltage
wiring on the template that corresponds with the
side sel ected in st ep 1.
Remove the te mplate and dr ill the holes.

3.

Run low voltage wiring to the location and pull

4.

about 6 in. (152 mm) of wire through the hole.
Plug the hole with nonflammable insulation to

5.

prevent drafts from affecting the control opera­tion.

® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. • •All Rights Reserved

69-1341

H8908B HUMIDISTAT H8 908C DEHUMIDISTAT

Remove the H8908 case from the base. See

6.

Fig. 1.
Position the base on the wall with the arrow up.

7.

Use the two 1 in. (25 mm) mounting screws to

8.

secure the base to the wall.

THERMOSTAT
WALLPLATE

MOUNTING
TEMPLATE

RETURN
AIR

6 in. (152 mm)
MINIMUM

BEST
LOCATION

ALTERNATE LOCATION

15 in. (381 mm)
MINIMUM

RETURN
AIR

MOUNTING

WIRING HOLES FOR MOUNTING ON RIGHT.
USE LEFT HOLES FOR MOUNTING ON LEFT.

HOLES (2)

Fig. 2. Positioning mounting template.

IMPORTANT

Use 18- to 22-gauge wire for proper wiring.

Connect the low voltage wires to the leads on the

9.

H8908.
Replace the H8908 case.

10.

Duct Mounting

IMPORTANT

When mounting near an elbow area, locate the
control 6 in. (152 mm) upstream from the
elbow so the element is exposed to the normal
airflow (Fig. 3).

4X DRILL 7/64 IN. DIAMETER
PERCER 4 X 7/64 PO.

CAUTION

Equipment Damage Hazard.
Be careful when selecting control
location and cutting hole in ductwork.
Do not cut or drill into air conditioning
or electrical accessories.
Do not install control on supply (hot air) ductwork.
To use template:

1. Remove backing and apply template to duct.

2. Cut along template dotted line and drill the

MISE EN GARDE

Risque d'endommager le matériel.
Faire attention au moment de choisir
l'emplacement du régulateur et de percer les
trous dans la gaine.
Ne pas couper ou percer les accessoires
électriques ou de climatisation.
Ne pas installer le régulateur sur la gaine
d'alimentation (air chaud).
Utilisation du gabarit:

1. Retirer l'endos du gabarit et placer le gabarit

2. Couper le long de la ligne pointillée du gabarit

M13370

1.

2.

3.

4.

5.

6.

7.

8.

9.

IMPORTANT

DUCT TEMPLATE

GABARIT DE GAINE

mounting holes.

sur la gaine.
et percer les trous de fixation.

RETURN AIR DUCT

M13369

Fig. 3. Selecting duct location for control.

Locate the control at least 8 in. (203 mm)
upstream from the humidifier (or dehumidi fier /
ventilator supply) in the return air duct. See Fig. 3.
Apply the duct template to the duct location.
Use the duct template, Fig. 4, to make the open­ing and mounting holes for the H8908.
Remove the H8908 case from the base. See
Fig. 1.
Position the foam gasket on the H8908 base.
Position the base on the duct with the arrow up.
Use the four 1 in. (25 mm) mounting screws to
secure the base to the duct.
Connect the low voltage wires to the leads on the
H8908.
Replace the H8908 case.

Use 18- to 22-gauge wire for proper wiring.

Fig. 4. Positioning return air duct template.

69-1341 2

M13373