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13
LTD HEATER INSTALLATION
AIRSTREAM SURFACE MOUNT HUMIDISTAT (EDS SYSTEMS ONLY)
1. The humidistat can be used to
directly control the operation of
a heater for drying, or with addi-
tional equipment, the operation
of a fan for aeration.
2. The humidistat closes on a
humidity rise. If the humidistat
is set at 50% relative humidity
and the humidity of the air sur-
rounding the sensing unit on the
humidistat is greater than 50%
relative humidity, the micro-
switch remains closed. When
the humidity drops below 50%
relative humidity the micro-
switch opens. Power then
ceases to travel through the hu-
midistat, simultaneously shut-
ting off the heater. If the humi-
distat is used as an aeration
control or fan control for natural
air drying, additional equipment
is required to control the fan
power supply, so it runs when
the humidistat is open.
5. The humidistat is used in con-
junction with a temperature
sensing control device (thermo-
stat), which senses the drying
air temperature. If the plenum air
temperature exceeds the setting
of the thermostat, the thermostat
opens and the heater shuts off.
When the plenum temperature
drops below the setting of the
thermostat, the thermostat
closes and the heater turns on
again. The thermostat is a safety
device keeping the grain tem-
perature equal to the thermostat
setting. Some grains are more
sensitive to temperature. Qual-
ity, germination and value are
lost due to high temperatures.
Grains used for seed, rice and
popcorn are adversely effected
by high temperatures.
3. The housing of the humidistat
has a perforated bottom allow-
ing air to surround the sens-
ing element. The perforated
bottom insures accurate sens-
ing of the (outside) humidity.
The housing also incorporates
a vent hole at the top of one
side. This guards against heat
build up in the box, changing
the relative humidity and de-
stroying the heat sensing abil-
ity of the unit. Also, air is drawn
through the perforated bottom
and across the sensing ele-
ment of the humidistat. These
design features insure accurate
sensing of relative humidity.
4. The humidistat should be
mounted with the back plate,
corner holes on a corrugation
hill. It should be positioned ap-
proximately three feet from the
ground or grade line as shown
in the illustration.