Specifications

CommStat 4™
Controller
CommStat 4™ Telecom HVAC Controller
The CommStat 4 is an HVAC controller designed
specifically for controlling two redundant air
conditioners, heat pumps and air conditioners with
two stage compressors in a telecommunications
shelter or enclosure. In addition to the control of
the air conditioners or heat pumps, the CommStat 4
has seven outputs for remote alarms or notification.
The CommStat 4 uses RS-485 communications via a
RJ11 communication jack. It is capable of interfacing
with a secondary control board which can interpret
Marvair's communication protocol and provide Internet
connectivity. Note: the end user must provide the
interface board and the Graphical User Interface
(GUI) software to gain access via the Internet.
The CommStat 4 is factory programmed with standard
industry set points, but can be configured on site.
Settings are retained indefinitely in the event of a power
loss.
CONTROL UP TO FOUR AIR CONDITIONERS OR HEAT PUMPS IN A SHELTER
The CommStat 4 has the capability to be daisy chained with up a second CommStat 4
controller for controlling up to four air conditioners or heat pumps in a shelter. When two
CommStat 4 controllers are daisy chained together, one of the controllers is the Master and
controls the second CommStat 4 controller. Any settings to the Master unit immediately
take effect on the Slave unit. The interface for the daisy chain is an RJ11 connector.
EASE OF CONTROL AND CONFIGURATION
A large, backlit LCD display shows the status of the system and provides a convenient
user interface. Status LEDs indicate Heat, Cool, Power and the Lead Unit. When a fault is
detected, an alarm LED flashes and the LCD screen displays the fault. If multiple faults are
detected, the display will scroll the faults across the screen.
The CommStat 4 is easily configured with four buttons. A Comfort button changes the
temperature in the shelter for 90 minutes. After 90 minutes, the temperature reverts
back to the programmed set points. A lead swap button alternates the lead and lag unit,
allowing service techs to quickly check the operation of each unit.
For security, the keypad can be locked out to prevent unwanted changes to the set
points. English, Spanish or French is selectable as the language shown on the display. °F
or °C is selectable.
RoHS COMPLIANT
The CommStat 4 controller contains no hazardous materials and is RoHS compliant.
CommStat 4 PDS 8.2011 rev 4
P/N 01675
46