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Skil-aire Mini-Spot 1-3T Systems Operating And Maintenance Instructions Manual

Cooling operation wall mounted thermostat
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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.

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Summary of Contents for Skil-aire Mini-Spot 1-3T Systems

  • Page 1 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.
  • Page 2 INSTALLATION INSTRUCTIONS TO THE INSTALLER A.) Hanging the unit. 1) Remove ceiling tile where unit is to be located and remove any adjacent tiles that would be helpful in handling the unit while positioning it in the ceiling. 2) Secure suitable type material (such as slotted angle) in place. The material should be capable of supporting the weight of the unit.

  • Page 3: High Speed

    D) Condensate A ¾” mpt fitting is supplied on each side of the unit. Cap the fitting that will not be used. E) Water Regulation valve (Water Cooled units only) Water regulation valves are factory adjusted to maintain an approximate head pressure of 260 lbs psig.

  • Page 4: De-Humidification And Reheat

    DEFROST CONTROL FOR HEATPUMP UNIT The Skil–Aire heat pump utilizes a defrost system controlled by a temperature sensing device. The defrost cycle initiates when the bulb attached to the outdoor coil senses a temperature of 30 F or less. This means that the unit (when in the heating cycle) will go into a defrost cycle only id the outdoor coil is cold enough to accumulate frost.

  • Page 5: Charging Procedure

    Reheat: Reheat units have a tendency to collect minute dust/dirt particles. When energized, these particles will burn off. Energize reheat during normal maintenance procedures. NOTE: disable halon system to prevent possible discharge during reheat test. CHARGING PROCEDURE Before charging make sure that no air was allowed to enter the system. If pre charged tubing was not used evacuate the system completely and check for leaks.
  • Page 6 2) Interconnection pipe charge For split-systems you need to consider the refrigerant charge being held in the interconnection piping (liquid drain line, hot gas line). The amount of charge held in the hot gas line is minimal. Therefore, we will consider only the liquid line for calculation purposes.

  • Page 7: Checking Product Received

    CHECKING PRODUCT RECEIVED Upon receiving unit, inspect if for any shipping damage. Claims for damage, either apparent or concealed, should be filed immediately with the shipping company. Check condensing unit electrical characteristics and accessories to determine if they are correct. Check system components (evaporator coil, condensing unit, evaporator blower, etc.

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