SK-3

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RESIDENTIAL AUTO CHANGEOVER PROGRAMMABLE HEATING AND COOLING CONTROLLER
- 1 HEAT/ 1 COOL

GENERAL DESCRIPTION

The SK3 programmable controller is designed for new or replacement single stage residential applications. The SK3 represents the latest in solid-state surface mount electronics and manufacturing techniques incorporated into an extremely low profile, ultra-slim white ABS plastic case. The SK3 contains a "user friendly" program along with an easy-to-read vertical LCD that displays all current information and operation modes. A direct wire, easy-to-install subbase mounts on a standard vertical outlet box or any dry wall surface using anchors and hardware provided.

STANDARD FEATURES
  • Selectable Celsius or Fahrenheit temperature display.
  • Fan selector for continuous fan operation.
  • Built-in short cycle protection.
  • Electronic circuitry replaces conventional mechanical anticipator.
  • Internal switch to lock-out the keypad to prevent unauthorised tampering.
  • 45 second fan purge after heating and cooling call.
  • 12 hour or 24 hour clock.
  • Daylight Savings Time button to adjust the clock ±1 hour.
  • Override feature.
  • Does not require a battery (always maintains the last setpoint and mode of operation following power outages of any duration.)
  • Solid state electronic output.
  • 5-2 day programming with 4 events per day.
  • Lockable access cover.
  • Plenum fan switch.
  • Temperature override (3 hours).
  • Continuous override (Hold).
  • Outdoor temperature Sensor (optional).
  • Indoor Remote Temperature Sensor (optional).
  • 1 C Heat/Cool separation.
  • Built-in anticipation & droop.
  • Minimum on/off times (2 or 4 minute selectable).
  • High temperature thermal cut-off switch.


    • SPECIFICATIONS
    Rated Voltage 20-30 Vac, DC 24 Nominal
    Rated A.C Current: 0.080 Amps to 1.5 Amps continuous per output with surges to 4 Amps Max.
    Control Range Cooling: 16 to 40 C in 1 C Steps
    Heating: 6 to 30 C in 1 C Steps
    Controller measurement range 0 to 48 C
    O.D.T. Measurement Range - 48 C to 48 C
    Control Accuracy ± 0.5 C At 20 C
    Minimum Deadband: (between heating and cooling) 1 °C
    Dimensions: 114mm x 102mm x 22mm
    Terminations: RH, W, RC, Y, G,
    Minimum wires required 4 (Single Transformer)

    OUTPUT TERMINAL FUNCTIONS

    RH 24 Vac supply from heating equipment transformer
    W Energises the heating equipment with a call for heating
    RC 24 Vac from the cooling equipment transformer
    Y Energises the cooling equipment with a call for cooling
    G Energises the fan when the fan is selected or with a call for heating or cooling
    RS2 & RS1 & RS+V Use to connect Outdoor Temperature Sensor option. Refer to the instructions included with the sensors.
    -Equipment load resistors (provided) may be required on the W¹ switching circuits if the equipment loads do not draw a minimum of 0.080 amps.
    - Connect load resistors at the equipment.

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