CommStat 4™ HVAC Controller
The CommStat 4 is our most comprehensive HVAC controller for air conditioners or heat pumps in a
telecom shelter or enclosure. A single CommStat 4 will control two redundant air conditioners or
heat pumps, but has the capability to be daisy chained with up to two additional CommStat 4 units
for controlling up to six air conditioners or heat pumps in a shelter. The CommStat 4 has seven
outputs for remote alarms or notification. A modem connection allows for remote viewing of the
shelter temperature, mode of operation, remote diagnosis and changing the configuration settings. A
unique Marvair feature, the Comfort button, allows a service tech to easily change the temperature
to provide a comfortable working environment. After 90 minutes, the temperature set points
automatically revert back to the programmed temperature set points. The CommStat 4 also stores the
last 10 ten faults that were registered.
Please see the CommStat 4 Product Data Sheet for a complete description of the operation and
installation of the CommStat 4 controller. To download the Product Data Sheet, scroll down to the
bottom of this page and follow the instructions.
Specifications/Features
Thermostats
- Thermostat Range:
- 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 for bith Stage 1nad Stage 2
- Adjustable changeover differential between heating and cooling.
Control Voltage: 24 VAC
Ease of Installation
- Wiring connection insensitive to phasing of the HVAC units.
- Easy terminal connections for thermostat wire.
- Remote temperature sensors insure accurate temperature readings.
Lead/Lag Operation
User selectable changeover from _ to 7 days in _ increments. 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 techs to easily check the operation of
each unit.
Alarms
Dry contacts can be used for remote alarm or notification. Relays can be wired Normally Open (NO) or Normally Closed (NC).
- High (Line) Voltage
- Low (Control) Voltage
- Lockout
- Low Building Temperature
- First Stage High Building Temperature
- Second Stage High Building Temperature
- Smoke alarm
- Aux 1 & Aux 2
CommStat 4 Inputs
- Input power
- Modem Connection
- Control voltage
- Line Voltage
- Temperature Sensors
- Smoke Detector
- Hydrogen Detector
- Generator Relay
- Economizer Mode Status Monitoring
- Lockout Relay
- Aux 1/ Aux 2
See Product Data Sheet for installation information and detailed operational specifications.
Downloadable literature
Get the latest version of Adobe Acrobat Reader
here.
Instructions for Downloading Marvair Literature
In order to quickly download a pdf, please right-click on the file name
and then save to your hard drive. After saving to your hard drive, then
open the pdf using Adobe Acrobat and either print or view. At times,
attempting to open a file instead of downloading can cause the file to
open very slowly or stall at a certain point. Also, firewalls or
anti-virus programs can cause errors or stalls. If you have problems
downloading any Marvair files, please contact Mary Beth Evans at
mbevans8@comcast.net and she can send the file to you via e-mail.
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