Coolerado C60A, Installation Manual

Page: 20 / 53

Coolerado Installation
Page
20
of 53
A standard thermostat can be used however most
thermostats do not have 0 to 10 VDC capabilities to drive the
Coolerado fully auto variable fan. For this reason Coolerado
sells a variable speed thermostat. This is a cooling only
thermostat, (heating is possible but requires a change over
sensor and relay that Coolerado does not provide nor
supports in any way).
See Appendix 6, Thermostat Operation (TEC2145-4) . For
additional information on the thermostat see Appendix 2,
Wiring and Control Diagram and Appendix 4, Multiple Unit
Control Diagram for wiring configurations.
Step 14 – HMX Wet Out Logic
Note: Do not start unit till Step 15.
The unit is equipped with an automatic wetting system that
provides a significant boost to the heat and mass exchangers
wetting operations when the unit is powered up at initial
installation, for seasonal restart, or any other time that the
heat exchangers have dried out after the power has been
shut off.
Surfactant Reservoir, Figure 32
Surfactant Pump and Manual Primer Switch, Figure 33
The system consists of a small pump, a surfactant (soap)
reservoir, and a manual override switch. Units are shipped
from the factory with a full reservoir of surfactant solution.
To start up the system the pump and tubing will need to be
primed with wetting solution at installation.
The pump is controlled by the circuit board, and is engaged
any time the unit is powered up 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 is held down.
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.
The automatic wetting system is engaged anytime the unit is
powered up. Be sure to check the surfactant reservoir and
verify that it is full with wetting solution. Dawn or Palmolive
liquid dishwashing detergent can be used to top off the
reservoir prior to power up.
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