Mini-Spot 1-3T Systems
Operating and Maintenance Instructions
Cooling Operation
Wall Mounted Thermostat
A wall-mounted thermostat controls the cooling set point. Upon a call for cooling, compressor
contact and evaporator fan relay contacts close. This will energize compressor and
evaporator fan and condenser fan when applicable. As temperature falls below the room set
point, the compressor contacts and evaporator fan contacts will open de-energizing the
system.
Unit Mounted Thermostat
A unit-mounted thermostat controls the set point. Upon a call cooling, compressor contact
relay closes. This will energize compressor and condenser fan when applicable. As the
temperature falls below the room set point the compressor contacts will open.
Fan Operation
Wall Mounted Thermostat
The evaporator fan will operate in either auto or continuous mode, which is controlled by the
thermostat sub-base. In the auto on position, the evaporator fan will run continuously.
Unit Mounted Thermostat
On units with unit mounted thermostats, the evaporator fan relay is kept energized by factory
installed jumper between terminals R & G.
Humidification
When the humidity drops below the set point on the wall mounted humidistat; the auxiliary fan
relay is on if it was off. At the same time, the water solenoid is energized, supplying water to
the evaporator pad When the humidity set point is reached the auxiliary relay and solenoid
valve are de-energized.
