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In situations where the ambient relative humidity is very low, the desired enclosure relative humidity may not be achieved
without adding moisture. To add moisture to the enclosure only use slow, natural evaporation from a small porous water
container. Do not use a humidifier.
Improper placement or installation may cause the unit's performance to be degraded. The warm air exhaust side
(Condenser Side) of the unit must have a constant supply of fresh air, less than 85°F. If the unit is exhausted into a
confined area with poor ventilation or duct work, it will not be able to reject the heat and moisture it is removing from the
enclosure and a malfunctioning unit will be suspected. If an obstruction to the flow of fresh air into or from the cooling unit
(see Fig. 3) is stopped or restricted for any reason the unit could heat rather than cool the enclosure.
NOTE: Should this condition develop when using the Sentry III, the unit will turn off when the enclosure temperature rises
to approximately 75°F, the unit will not restart until the enclosure temperature is lowered to approximately 65°F or the unit
is disconnected and then re-connected to the power supply. This feature is disabled for approximately 45 minutes after the
unit is connected or re-connected to a power supply to allow initial cooling of enclosure.
Proper sealing of the enclosure through the use of a vapor barrier and weather stripping cannot be over emphasized. The
unit will not be able to maintain the proper conditions if fresh; moisture-laden air is constantly being introduced into an
improperly sealed enclosure. Symptoms of this condition are; unit runs all the time with only a slight reduction in enclosure
temperature and/or water overflows from the unit. One way of discovering gross air leaks is to stand inside the enclosure
with the lights off, allow your eyes to adapt to the dark and look for light showing through cracks in the walls or around the
door. Also close the door on a piece of paper, if you can pull the paper through the door seal, it means air and moisture are
also entering into your enclosure. Because of the temperature difference between the inside and outside, very small cracks
can allow large amounts of outside air into the enclosure. Please be aware that moisture will pass through solid concrete,
brick, paint, paper and wood. A newly constructed room may contain fresh wood, paint, concrete and other building
materials containing large amounts of moisture. This condition can cause symptoms similar to a poorly sealed enclosure,
but will gradually go away.
EXTENDED DRAIN TUBE
VIEW
GREY OR RED
FITTING
CLEAR TUBING
RED PLUG
NON EXTENDED DRAIN
Figure 4
(TUBE LOCATION)
EXCESS CONDENSATE DRAIN TUBE: Your unit is equipped with a Pull-down Drain tube to prevent condensate
overflow. To temporarily drain excess amounts of condensate engage the drain tube and provide a receptacle or drain to
receive the excess condensate.
EXTENDING THE DRAIN TUBE: To extend and open the drain, use a pair of small pliers to grab the red plastic plug
and vinyl tubing. Pull the plug and tubing down approximately 6 inches until it snaps into the locked position and the "Grey
Fitting" is visible through the drain hole (see Fig. 4). Remove the bottom red plug. Now the cooling unit will drain any
condensate that is standing above 1/4 inch deep in the base pan.
CLOSING THE DRAIN TUBE: To close the drain tube, simply replace the "Red stopper" and push the vinyl tubing back
up into the bottom of the cooling unit. This action extends the top of the tube above the water line preventing it from
draining. CAUTION: Do not push the entire length of tubing back up into the drain hole.
INSTALLING A DRAIN LINE: To extend the drain tube into a basement drain or container, acquire a length of vinyl
tubing with an inside diameter of 1/2 inch from a local hardware store. Slip this larger piece of tubing over the Pull-down
drain tube. CAUTION: Always have the extended drain line running "down hill". This is a gravity flow system. If a
horizontal run is encountered, an air vent or condensate pump may be required to maintain drainage.
Do not drill or tap the drain hole. Doing so will result in rusting of the metal base and void the unit's warranty.
WK(L)06/02 PG 5
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