COPYRIGHT
DRI-EAZ PRODUCTS, INC. 1996
5
drainage tray and is removed through the gravity drain
hose or the automatic pump-out system.
The air then passes over the condenser coil where it is
heated to a temperature slightly above that of the room.
This heat is derived from the electrical components, the
work done by the compressor and from the latent heat
released from the condensed water. This warm dry air
is then discharged from the front outlet grill and circu-
lates around the room absorbing more water vapor be-
fore re-entering the DrizAir 120.
In order to condense water vapor into liquid, energy
must be removed. About 970 BTU's of energy must be
released by the vapor to condense one pint of water
(8000 BTU's to condense 1 gallon). This energy is re-
tained within the water vapor and is referred to as la-
tent heat.
Using the DrizAir 120, the water vapor that is con-
densed releases energy back into the atmosphere and
raises the air temperature in the room. Be aware that
operating the unit in very small, enclosed rooms may
dramatically increase the room temperature. Do not
operate the unit when the ambient air temperature ex-
ceeds 100° F (38° C).
Caution
Do not position multiple units in such a way that one
unit blows directly at another.
Drying Operation
Wet outside air is constantly passing through a
building at a rate depending on a number of factors,
including the wind pressure on the building and the
amount of air gap around doors and windows. As an
example, a typical home on average will change its air
every two to three hours. In order to dry the structure
of the building in a reasonable time, the relative hu-
midity of the air should be about 40% Rh at 70° F (21°
C). In most cases the air has to be dried artificially to
reduce it to 40% Rh. It is important that when the hu-
midity is greater than 40% outside, all doors and win-
dows are kept closed.
Defrosting
When the DrizAir 120 is operating at a room tem-
perature of 68° F (20° C) or higher, water will normal-
ly emerge from the unit. When operating at lower tem-
peratures, frost may appear on the evaporator coil in-
stead of water. An automatic control built into the Dri-
zAir 120 allows ice to build up until it starts to create
an adverse effect on air flow through the unit. During
the frost build up, no water will drain from the unit. At
low temperatures this normal ice buildup may last from
45 minutes to several hours, depending on conditions.
After a given buildup of ice has occurred, the ther-
mostat senses the associated ice temperature and in-
itiates the defrost cycle. During defrost, the fan switch-
es off and considerable quantities of water will drain
from the unit. As soon as the ice has melted, the nor-
mal fan operation will resume. The defrosting period
will last up to 10 minutes, depending upon conditions.
Periods between the defrost cycle will vary according
to operating conditions.
EXTRACTION RATES
In all dehumidification systems the extraction rates
vary with humidity and temperature. An electronic
thermo-hygrometer from Dri-Eaz Products will help in
checking for proper operation. The chart provides
some examples of extraction rates at various condi-
tions.
Water Removal Chart
Temp F / Rh
Temp C / Rh
Extraction
50° F / 60%
10° C / 60%
20 Pints
60° F / 60%
16° C / 60%
40 Pints
70° F / 70%
21° C / 70%
59 Pints
80° F / 60%
27° C / 60%
64 Pints
90° F / 80%
32° C / 80%
104 Pints
100° F / 90%
38° C / 90%
120 Pints
