Product Literature

Marvair CommStat Touch Manual-PDS (Rev.4) (pdf - 4737 KB)

CommStat Touch HVAC Controller Marvair CommStat Touch Telecom HVAC Control

The CommStat Touch telecom controller with a touch screen interface is designed to allow remote control and monitoring of Marvair air conditioners and heat pumps with single or 2-stage compressors in a shelter or enclosure and is certified by ETL for HVAC UL60950-1 and FCC47CFR compliance.

In addition to the control of HVAC equipment, CommStat Touch provides status information, alarm notifications, set point adjustment, and remote HVAC configuration.

CommStat Touch is factory programmed with standard industry set points, but can be configured on site or remotely and includes the Marvair RemoteLink IPv4/IPv6 communication module and the latest generation CommStat 4 PLC-based telecom controller. A standard Category 5 ethernet cable connects CommStat Touch to the shelter local network

Features and Benefits:

Programmable Logic Board

  • Balanced Use of Conditioning Equipment
  • Sequence the Operation of Two ComPac Units
  • Ensures Maximum Efficiency
  • Independent Economizer Control

Remote Access & Control with Touch Screen for Any Marvair CommStat HVAC Controller

  • Connect to Any Network Using the IPv4 or IPv6 Networking Protocol
  • Complete System or Upgrade Existing CommStat 4
  • Easy-to-Use Touch Screen Graphical Interface
  • Remote Monitoring & Configuration

Remote Status and Control

  • Shelter Temperature
  • Alarms/Lockouts
  • Utility Power/Generator Status
  • Lead/Lag Status
  • Economizer/DX Cooling/Heat Status
  • Set Points
  • Change Set Points
  • Reset Alarms
  • Swap Lead
  • Change Stage Differentials

Specifications and Additional Features

Remote Status, Monitoring, and Configuration
The CommStat Touch connects to a Network Operation Center (NOC) to provide two-way communication and control functions. Shelter conditions and HVAC status can be monitored and settings changed without the need to physically visit the site. Alarms are displayed and can be reset remotely or by using the touch screen.

Control Up To Four Air Conditioners Or Heat Pumps In a Shelter
The CommStat Touch has the capability to be daisy chained with a second CommStat Touch controller for controlling up to four air conditioners or heat pumps in a shelter. When a CommStat Touch controller is daisy chained with a CommStat 4 in a Master/Slave configuration, 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 touch screen LCD display shows the status of the system and provides a convenient user interface. Status indicators for Heat, Cool, Power, Alarms and the Lead Unit are always displayed. When a fault is detected, an alarm symbol flashes and the LCD screen displays the fault. If multiple faults are detected, they will be displayed on the touchscreen and the remote interface.
The CommStat Touch is easily configured using the built-in graphical display. 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 technicians to quickly check the operation of each unit.
For security, the keypad can be locked out to prevent unwanted changes to the set points. °F or °C units are selectable.

RoHS Compliant
The CommStat Touch controller contains no hazardous materials and is RoHS compliant.


  • Cooling Set Point: 65°F through 95°F
    (18°C through 35°C) in 1° increments.
  • Heating Set Point: 50°F through 80°F
    (10°C through 27°C) in 1° increments.


  • All stages ON differential: 1°F through 5°F
    (1° through 3°C) in 1° increments.
  • All stages OFF differential: 1°F through 5°F
    (1° through 3°C) in 1° increments. The 2nd stage differential is referenced to the 1st stage differential and the outputs will stage off as each stage’s differential is satisfied.
  • Changeover Differential between cooling and heating: Minimum of 3°F (2°C).
  • 3rd stage cooling Differential: 0°F through 7°F
    (0°C through 4°C) in 1° increments

Control Voltage

  • The CommStat Touch is powered by 24 VDC or 48 VDC power supply. Should AC power be lost, the display, user interface and the alarm outputs remain functional. System outputs (Y, G, W, O and the Mixed Air Relay) will not be functional when 24 VAC is not present. If the control voltage is not present, the Low Voltage Loss alarm relay is energized and displayed on the screen.

Operating Range:

  • -40°F through 150°F (-40°C through 66°C)

Minimum/Maximum AC Voltage:

  • 18/30 VAC

Minimum/Maximum DC Voltage:

  • 20/60 VDC

Ease of Installation

  • Wiring connection insensitive to phasing of the units.
  • Easy terminal connections for thermostat wire.
  • Remote temperature sensors insure accurate temperature readings in the shelter.
  • Easy attachment to the wall.

Lead/Lag Operation

  • User selectable changeover from ½ to 7 days in ½ day increments or automatic changeover on each call for cooling or heating. If the lead unit loses power, the lag unit automatically becomes the lead unit with all the set points of the lead unit. A lead swap button alternates the lead and lag unit, allowing service technicians to easily check the operation of each unit.

Dry contacts can be used for remote alarm or notification. Relays can be wired Normally Open (NO) or Normally Closed (NC). Alarms can be reset by pressing the "Reset Alarms" button on the status screen. All alarms remain functional when 24 VAC is not present.

  • Low (Control) Voltage – activated if 24 VAC control voltage is not present.
  • Lockout – activated if any air conditioner or heat pump is off due to either high or low refrigerant pressure lockout. If all the air conditioners or heat pumps are locked out, the Mixed Air Relay (MAR) will be activated on each of the air conditioners or heat pumps. This air conditioner or heat pump will go into the Ventilation mode, provided there is a call for cooling. (Note: The Mixed Air Relay is only on units with an economizer) If desired, the lockout alarm can be disabled by the user in the Configuration Set-up.
  • Low Building Temperature Alarm – Activated if the temperature in the building drops to the selected temperature. If the low building temperature alarm is activated, the LCD displays, “Low Building Temperature”.
  • First Stage High Building Temperature Warning – If the set point temperature is reached, the display will show, “First Stage High Building Temperature” on the LCD display.
  • Second Stage High Building Temperature Alarm - Activated if the set point temperature is reached, the display will show, “Second Stage High Building Temperature” on the LCD display.
  • Smoke Alarm – the contacts will be energized when the smoke detector inputs receive a signal from an external detector. All air conditioners or heat pumps are immediately shut down. A physical reset is required to clear the alarm in the manual mode. If auto reset has been selected, the alarm will reset after the user specified time (3-10 minutes). Smoke Alarm will be displayed on the screen.
  • AUX1 and AUX2 – Two auxiliary dry contact outputs that can be energized based upon AUX1 and AUX2 inputs. See AUX1-IN/AUX2 INPUT on page 4 for complete description.

For detailed specifications, performance, and efficiency information, download the Product Data Sheet from the document list on this page.