CommStat 3™ Lead/Lag Controller
The CommStat 3™ controller is a solid state control package designed
to operate a fully or partially redundant air conditioning system. It 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 our environmental
control units. The CommStat 3™ is housed in an aqua blue, corrosion
resistant, polycarbonate enclosure.
Specifications/Features
Thermostats
- Thermostat Range:
- Cooling: 72° - 95°F (22° - 35°C)
- Heating: 50° - 80°F (10° - 27°C)
- Programmable in °F or °C
- Two stages of heating and two stages of cooling
Differential
- Adjustable on-off differential of each stage
- Adjustable interstage differential
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
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
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
See Product Data Sheet for installation information and detailed operational specifications.
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