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8 IAQ Series
check all points for leakage. The operation of the
unit may be checked by starting the air handler.
The humidifier operates only when the air
handler blower motor is energized. The
humidifier is now ready for operation.
6. During the summer, turn off water supply and
electrical power to humidifier. Close air damper.
Table 1
Outside Temperature
-20°F
-29°C
-10°F
-23°C
0°F
-18°C
+10°F
-12°C
+20°F
- 7°C
+30°F
- 1°C
HoW THe HUMIdIfIeR WoRKs
The operating principle of the humidifier is based on
the most efficient and economical means of
evaporating water to the air. The humidifier uses
only 2.5 watts of electrical power during operation,
less than the smallest household light bulb. The heat
necessary for evaporating water is produced by the
air handler.
The water supply to the humidifier is controlled by
the electric solenoid valve. The humidistat
connected in series with the solenoid provides low
voltage control of the humidifier. The humidistat is
designed for wall mounting in the living area or
surface mounting on the return air duct.
ELECTRICAL RATING: 24 VAC / 60 Hz.
Water flows through a strainer, is metered through
an orifice to provide the proper amount of water, and
is supplied to the evaporator pad by the distributor
trough. Approximately 200 CFM of air is by-passed
from the warm air plenum through the humidifier
and returned to the cold air plenum. Moisture is
6 720 220 343
Recommended Setting
15%
20%
25%
Caution
30%
35%
40%
Subject to change without prior notice
How the Humidifier Works
evaporated to the air passing through the evaporator
pad. Minerals are not blown into the air stream as
occurs in atomizing humidifiers; they are left on the
evaporator pad where a high percentage is carried
off with the waste water. When the humidifier is
installed and operating, no adjustments are
necessary other than setting the control knob on the
humidistat to the desired level of humidification.
Leave knob on the humidifier in "WINTER" position.
To turn the humidifier off, close water supply valve,
switch electrical power off and turn humidistat off. If
air handler is used for summer cooling or ventilating
set air damper on "SUMMER".
Do not set relative humidity too high during cold
weather. Excessive humidity may cause
condensation on windows or in walls. Refer to
recommended settings as described in Table 1.
HUMIdIfIeR PaCKaGed CoMPonenT
aCCessoRIes
bosch HUM series Includes:
Humidifier Components:
Vapor Pad
Solenoid Assembly
Integral Bypass Damper Accessories:
Manual Humidstat
Saddle Valve
The humidifier comes with a humidistat controller
setup for the duct mounted option. The wall base
(Bosch part: 7738002911) can be ordered for the
wall mount controller option. Contact your local
Bosch distributor to order this part.
ConTaCT YoUR loCal bosCH dealeR
oR InsTallInG ConTRaCToR foR
PRodUCT sUPPoRT.
field Technical support:
(954) 776-5471
Monday-Friday: 8 am - 5 pm EST
bosch
601 N.W. 65th Ct.
Ft. Lauderdale, FL 33309
www.bosch-climate.us
Revised 07-12
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