Coolerado Installation
Page 20 of 63
The system consists of a small pump, a surfactant (soap)
reservoir, and a manual override switch located on the water
control board. Units are shipped from the factory with an
empty reservoir but separately a full bottle of surfactant
solution. This is to prevent soap being spilled into the unit
during transportation. To start up the system the pump and
tubing will need to be primed with wetting solution at
installation; prime switch on water control board.
The pump is controlled by the water control board, and is
engaged any time the unit is powered up after an extended
powered off time and there is a cool call. The pump and
surfactant lines must be primed full of surfactant before the
system is started for wetting heat and mass exchangers. The
pump will operate as long as the override primer switch on
the water control board called “PRIME” is held down.
To assist in manual, startup of unit there is also a “WETOUT”
button on the water control board that when pushed will
start a wet out cycle.
To allow the unit to be operated over the winter months
without water the “WINTER” switch can be activated. The
winter mode can also be activated through control wiring and
it will take precedence.
When filters are changed, top off the reservoir with Dawn™
or Palmolive™ liquid dishwashing detergent.
NOTE: At installation or 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.
A capacitor has been included on the water control board to
keep an internal clock going with a power failure. The unit is
then able to know how long a power failure has been and can
start up without a rewetting of the HMX’s if the time has
been less than one hour if dipswitch 1 is OFF or 4 hours if ON.
When the unit power is turned on after an extended off time,
(greater than one hour if dipswitch 1 is OFF or four hours if
ON), 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 for 2 additional cycles
with soap. This 30 second on and 2 minute off will then be
repeated and additional 5 times without soap.
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.
Check outlet temperature after 2 hours of system operation.
If the conditioned air temperature (dry bulb) is within 3
o
F, (-
16
o
C), of the inlet wet bulb temperature, no other action is
needed.
NOTE: If there is excessive soap in the unit at start up, it may
take a day to dispense all bubbles and the temperature to
come down to normal operation.
If the conditioned air temperature (dry bulb) is more than
3
o
F, (-16
o
C), above the inlet wet bulb, manually turn the
water off and switch to winter mode and let unit run for 20 to
45 minutes depending on the outside temperature, (hotter
shorter time), to let the HMX’s dry out. Switch back to
summer mode 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.
During normal operation, when the thermostat gives a
cooling call it will activate the water control board. The fan
and the water cycle will start immediately. The water will go
off for 2 minutes after initial wetting that is dependent on the
temperature and humidity then cycle as needed 2 minutes off
and on as needed.
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.
Step 15 – Operational Startup
1.) For C60 turn the fan switch on the top front of the
unit off. The M50A fan will shut down when the
filter cover is removed.
2.) Remove all electrical and soap pump cover plates
3.) Turn off the cool call or disconnect the cool call by:
a. C60 disconnecting the wire at the RC terminal
on the terminal strip to the left of the water
control board as seen standing in front of the
unit, (not the transformer connections R and C
terminals).
b. M50 disconnecting the wire at the RC terminal
in the low voltage junction box at the bottom of
the unit.
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