Owner’s Manual
Page - 12 - of 22
Figure 3: Surfactant Reservoir.
NOTE: It is recommended to check surfactant levels during filter inspections. If needed add Dawn or Palmolive liquid dishwashing
detergent.
NOTE: At any time that the unit has been dried out, such as after winterization or vacation shut-off, it is imperative to add a
surfactant to the water supply to allow the air conditioner heat exchangers to fully wet out.
After the heat exchangers have been wet out, water will distribute itself evenly until the heat exchangers are dried due to the water
being turned off, or power being turned off for an extended period of time.
When the unit is powered up and a cooling call is made from the thermostat, the water control board has been programmed to
engage the fan, solenoid valve, and the surfactant pump. After 2.5 minutes the water and surfactant will be turned off for 10
minutes. The water control board will then cycle the water on for 30 seconds and off for 2 minutes repeating this over a 42-minute
period. The fan will run at half speed during this time.
The water control will then be regulated according to outside temperature, humidity, dynamic water pressure at the unit (water
flow), as well as the fan speed and control settings.
NOTE: If there is excessive soap in the unit at start up it may take a day to get all the bubbles out and the temperature to come
down to normal operation.
If the conditioned air temperature (dry bulb) is more than 4
o
F (3
o
C) above the inlet wet bulb after 24 hours of running, manually
turn the water off and let unit run for 20 to 45 minutes depending on the outside temperature, (hotter shorter time). Turn off the
power to the unit for 15 seconds, turn water back on, and repower to allow the wetting process to start over. Because of the
partially wet HMX’s and recent wetting out there may be a lot of bubbles that come out of the unit.
During normal operation, the thermostats cooling call will activate the water control board. The fan and the water cycle will start
initially for 2 minutes, then off for 2 minutes. This process is necessary to maintain the unit’s evaporation rate and mineral flush
requirements.
Without a cooling call for a period of 1 hour, the water control board will douse the heat exchanger with fresh water to ensure the
heat exchanger remains saturated. The water will cycle on for 2 minutes, then off for an hour starting a new cycle.
If the thermostat cycles or user turns off the air conditioner and then cycles back on in less than 2 minutes, the fan and water will
not come on for 2 minutes from the time the unit is turned off to prevent short cycling.
Note: Do not dry heat exchangers at night by turning off the water, bypassing the low water pressure switch and running the
blower using only cool night air. Doing so on a daily basis will allow mineral deposits to build-up, and the wetting procedure
outlined in the installation manual will need to be repeated. This will void the warranty.
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