H808C
Convertible Dehumidifier Controller
4. Remove the humidity controller assembly by prying
Application
with a screwdriver in the notch on the bottom of the case
(Fig. 1).
The H808C Dehumidifier Controller provides automatic
5. Position the case horizontally over the wires with the
low voltage control of dehumidifiers in central heating
arrows on the tabs pointing up and secure the case to the
systems. The humidity controller has an spst, snap-acting,
wall using the two screws provided.
dust-proof switch and is designed for wall or surface duct
6. Connect the wires to the humidity controller assem-
mounting.
bly using leadwires and wire nuts provided (see Wiring
section and Fig. 2).
7. Tuck the wires into the bottom of the case.
8. Snap the cover assembly into the case (Fig. 2).
MODELS:
I H808C1029: Premier White™.
I H808C1037: Beige.
ELECTRICAL RATING: 50 VA at 24 Vac.
Fig. 1—Removing humidity controller assembly
from case.
MAXIMUM AMBIENT TEMPERATURE: 125° F [52° C].
SWITCH DIFFERENTIAL: 5 percent RH, nonadjustable.
SET POINT ADJUSTMENT RANGE: 20 to 80 percent
RH; positive ON and OFF positions.
Installation
CAUTION
1. Installer must be a trained, experienced service
technician.
2. Disconnect power supply before beginning
M9262
installation.
3. Conduct a thorough checkout before leaving
installation.
Fig. 2—Wiring connections on humidity
controller.
WALL MOUNTING
1. Locate the humidity controller about 5 ft [1.5m]
above the floor on an inside wall.
QUICK-CONNECT
WIRE LEAD
NOTES:
a. Be sure the humidity controller is subject to average
room temperature and average relative humidity.
The maximum temperature at the location selected
must not exceed 125° F [52° C].
b. The humidity controller can be mounted directly on
COVER
WIRE
NUT
the wall.
HUMIDIFIER
LEADWIRE
CASE
2. Drill a small hole in the wall.
UP
UP
3. Run low voltage wiring to the location and pull about
UP
6 in. [152 mm] of wire through the hole.
MOUNTING
HOLE (2)
NOTE: Plug the opening to prevent drafts from affecting
M9263
humidity controller operation.
J.F. • 3-94 • ©Honeywell Inc. 1994 • Form Number 69-0821
Fig. 5—Typical parallel wiring diagram of H808C with T87F/Q539A combination for dehumidification
and mildew control.
H808C
T87F/Q539A INTERNALSCHEMATIC
T87F
FIXED
R1
COOL
ANTICIPATOR
FILTER
LIGHT
TEMPERATURE
FALL
ADJUSTABLE
HEAT
ANTICIPATOR
W1
Y1
HEAT OFF COOL
AUTO FAN ON
HEAT
OFF
COOL
3
2
R
H
X
B
O
W
Y
G
R
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN RELAY
COIL
1
PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS
AS REQUIRED.
HEATING DAMPER MOTOR, IF USED.
2
3
CLOGGED FILTER SWITCH OR COOLING PANEL CONNECTION.
1
M18627
Fig. 6—Typical series wiring diagram of H808C with T87F/Q539A combination for dehumidification and
mildew control.
H808C
T87F/Q539A INTERNALSCHEMATIC
T87F
FIXED
R1
COOL
ANTICIPATOR
FILTER
LIGHT
TEMPERATURE
FALL
ADJUSTABLE
HEAT
ANTICIPATOR
W1
Y1
HEAT OFF COOL
AUTO FAN ON
HEAT
OFF
COOL
3
2
R
H
X
B
O
W
Y
G
R
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN RELAY
COIL
1
PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS
AS REQUIRED.
HEATING DAMPER MOTOR, IF USED.
2
3
CLOGGED FILTER SWITCH OR COOLING PANEL CONNECTION.
1
M18626
3
69-0821
DUCT MOUNT HUMIDITY CONTROLLER
If the temperature at the humidity controller location
on the return air duct is less than 80° F [27° C] ,use the
procedure for wall mounted humidity controllers.
If the air surrounding the humidity controller is greater
than 80° F [27° C], reset the recommended settings to
compensate for the higher ambient temperature. High ambi-
ent temperatures will cause the humidity controller to control
at an increased setting. To determine the compensated set
point for surface mounted humidity controllers with high
ambient temperatures, use the following procedure:
1. With a bulb type thermometer, accurately determine
the surrounding duct temperature at the humidity controller
location.
Fig. 7—Typical wiring diagram for H46C,E.
HUMIDITY
1
RISE
DEHUMIDIFIER
L1
EXHAUST FAN
(HOT)
OR AIR
CONDITIONER
H46C, E CONTROLLER
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M9297
WIRING
All wiring must comply with local codes and ordi-
nances. Make wiring connections according to to dehu-
midifier instructions if available; otherwise, see typical
wiring diagrams in Figs. 5 and 6.
2. Decrease the recommended setting about five percent
for each 5° F [3° C] above 80° F [27° C] at the humidity
controller.
For example, if the humidity controller is set at 25 per-
cent and the temperature at the humidity controller is 90° F
[32° C], the compensated set point should be 15 percent.
(This is the 25 percent setting less 10 percent for the 10° F
[6° C] above ambient temperature.)
Settings
HUMIDITY CONTROLLER ADJUSTMENT
The humidity comfort range of a living space is gener-
ally between 25 and 50 percent RH. However, as the
outdoor temperature changes, the humidity level on the
humidity controller may need to be reset to assure maxi-
mum comfort.
To reduce the relative humidity, reduce the set point ap-
proximately three percent RH every 24 hours. To increase
the relative humidity, increase the set point approximately
three percent RH every 24 hours.
Checkout
Place the system in operation and observe through at
least one complete cycle to make certain that all compo-
nents are functioning properly.
WALL MOUNT HUMIDITY CONTROLLER
Set the humidity set point according to the prevailing
outdoor temperature to provide optimum relative humidity
control for most installations. Adjust the humidity level to
a particular structure using the procedure above.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9
Helping You Control Your World
QUALITY IS KEY
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