COMMSTAT 3™ LEAD/LAG CONTROLLER

A solid state control package designed to operate a fully or partially redundant air conditioning system.

The Marvair CommStat 3™ is factory programmed with industry standard set points to facilitate installation. If desired, each of the set points can be quickly and easily changed in the field by the installer. The lead/lag controller insures equal run time on each air conditioner and allows the lag unit to assist upon demand.

The CommStat 3™ controller can be used with Marvair's ComPac® I and ComPac® II air conditioners or environmental control units. The CommStat 3™ is housed in an aqua blue, corrosion resistant, polycarbonate enclosure.

ALARM RELAYS


Dry contacts can be used for remote alarm. Relays can be wired either for Normally Open or Normally Closed

  • Power

  • Low building temperature

  • High building temperature

  • Refrigerant pressure lockout

  • Smoke detector input

  • Smoke detector output

FEATURES

  • THERMOSTAT RANGE

    Programmable in °F or °C

    Cooling: 65° - 95°F (18° - 35°C) in 1° increments.

    Heating: 50° - 80°F (10° - 27°C) in 1° increments.

  • DIFFERENTIAL

    Adjustable on-off differential of each stage

    Adjustable interstage differential

  • MAXIMUM VOLTAGE

    24 VAC

  • EASE OF OPERATION

    Easy to change set points

    Push button to change lead and lag unit

    LED's indicate

    Control power

    Function (heating or cooling)

    Lead unit

    High or low refrigerant pressure lockout

    Digital display of temperature

    Comfort button temporarily overrides set points for 90 minutes

    If one A/C loses power, the other A/C automatically advances to the lead position

    Indefinite program retention if power is lost

  • EASE OF INSTALLATION

    Insensitive to phasing of units

    24 VAC

    No additional power source required

    Built-in temperature sensor with up to three optional remote sensors