MARVAIR S/04581 COMMSTAT 3 Lead Lag HVAC CONTROLLER (201134)

Description

Marvair CommStat 3 Lead-Lag HVAC Controller, Part S/04581:
This brand new CommStat 3™ Controller by Marvair® is a solid state control
package
designed to operate a fully or partially redundant air conditioning system for a telecommunication cabinet or shelter. The CommStat 3 Controller is factory programmed with standard industry set points to facilitate installation. If desired, each of the set points can be quickly and easily changed in the field by the installer. It can be used with Marvair’s ComPac® I or ComPac® II unique vertical packaged wall mount air conditioners or Marvair’s environmental control units.
The CommStat 3™ Controller provides environmental control and the security demanded by the communications industry for a back-up unit. The lead/lag controller insures equal wear on both air conditioners while allowing the lag unit to assist upon demand. The lead/lag changeover is factory set at 7 days, but is programmable in half-day increments from 1/2 to 7 Range:
Cooling is 65 - 95°F (18 - 35°C); default, 75°F (24°C).
Heating is 50 - 80°F (10 - 27°C); default, 68°F and display in °F (default) or °C.
Thermostat provides two stages of cooling and two stages of heating.
Changeover differential between cooling and heating is a minimum of 4°F differential of each stage is adjustable from 2 - 5°F (1 - 3°C); default, 3°F (2°C).
Interstage differential (stage 1 cooling to stage 2 cooling) adjustable from 2 - 12°F (1 - 7°C); default, 2°F (1°C).
Ease of Installation
Wiring connections insensitive to phasing of units.
24 VAC with 24 VDC or 48 VDC backup power.
Easy terminal connection for thermostat wire.
No additional power source required for operation.
Temperature sensor built into unit. Optional remote sensors available for measuring temperatures, up to 24 ft. from the CommStat 3™ Controller, in up to 3 locations in the shelter.
Easy attachment to wall.
Ease of Operation
Extremely easy to program or to change factory settings.
Push button on front to swap lead and lag unit.
LEDs indicate:
control power from each air conditioner.
function (heating or cooling) of each unit.
lead unit.
high or low refrigerant pressure lockout.
Digital display shows temperature.
Comfort override push button temporarily overrides set points for 90
minutes
. Select either 72°F (22°C) or 77°F (25°C). Display blinks to indicate Comfort Mode.
If one air conditioner loses power, the other air conditioner automatically advances to lead control.
Indefinite program retention on power loss.
Alarm RelaysDry contacts can be used for remote alarm or notification. Relays can be wired for either Normally Open or Normally Closed.
Power - activated if 24 VAC is not provided to the CommStat 3™ Controller.
Low temperature alarm - activated if temperature in building drops below set point. Default is 41°F (5°C).
High temperature alarm - activated if temperature in building exceeds set point. Default is 95°F (35°C).
Refrigerant pressure lockout - activated if either air conditioner is off due to a high or low refrigerant pressure.
Smoke detector input - when a signal is received from an external smoke detector, both air conditioners are immediately shut down.
Smoke alarm output - activated if a signal is received from the building's smoke detector.
DC Power Back upIn the event of a loss of 24 VAC power, a user provided 24 VDC or a 48 VDC can be used to operate the CommStat 3. When operating on DC power, the display, the user interface and the alarm outputs are 7-1/2” x 6” x 2” (190mm x 150mm x 50mm).
Doubles as junction
box
for control wiring to air conditioner.
Designed for use with conduit.
Corrosion resistant polycarbonate material.