Environment Controller 2450

Sierra Monitor’s Facility Environment Controller 2450 is an electronic, microprocessor-based system designed to manage the heating, ventilating and air conditioning (HVAC) controls, environmental alarms, and manage rigorous personnel safety requirements of controlled environment vaults (CEVs) and walk-in cabinets. Recognized as the standard of the industry, the Model 2450 has been installed in over 90% of all new CEVs deployed since its introduction.

The Model 2450 employs lead/lag and demand logic to control two air conditioners. Application specific software is used to collect data from various sensor inputs to make continuous, real-time control logic and alarm decisions. The results of the logic are used to operate control outputs, send alarms to telephone company systems, and display status and alarm conditions on the front panel of the controller.

The Model 2450 also monitors CEVs for the presence of combustible and toxic gases and automatically initiates ventilation when an alarm threshold is exceeded. Alarm thresholds are automatically reduced from unoccupied levels to OSHA defined, occupied levels to further ensure personnel safety.

Environment Controller 2450

  • Application Specific Software – Execute full HVAC control of structures for a precisely controlled and safe environment for telecom equipment and personnel
  • Environmental Control with integral Gas Detection – Monitor hazardous gas and environments and control HVAC units with lead/lag and demand logic
  • Operator Friendly Control Panel – Easily operate controls through a fluorescent front panel keypad and display
  • Convenient Computer Interface – Integral data port and modem allow bi-directional communication to hand held devices or remote computers for diagnostics, set point management and reporting.

Specifications for Environment Controller 2450

System

  • Power
    • 120 VAC, 50/60/Hz
    • -48 VDC (20-66 VDC)
    • 5 Watts nominal
  • Microprocessor
    • Motorola 68HC11 with watchdog timer
    • Clock Speed 8 MHz
    • 2.5 Kbytes EEPROM
    • 64K bytes EPROM
    • Real Time Clock w/ 30 day backup by a super capacitor
  • Modem
    • Hayes Compatible 2400 Baud
  • Software
    • Supports any terminal communication program via modem or direct serial connection. Over 70 programmable set points and two level access code

Environmental

  • Temperature
    • Operating Range: 4o to 122oF (-20o to 50oC)
    • Storage Range: -40o to 122oF (-40o to 50oC)
  • Humidity
    • 0-95% RH

Front Panel

  • Display: Vacuum fluorescent alphanumeric (2 rows x 20 characters)
  • Indicators
    • 4 LED’s for run modes
    • 10 LED’s for alarm status
    • 14 LED’s for control status
  • Keypad: 6 keys for run modes (4) and reset (2)

Malfunction Protection

  • Automatically turns on blower, air damper, red indicator and malfunction alarm if system malfunctions

Interface

  • Serial: Serial port for direct connection to portable PC or hand held terminal for viewing data or changing set points
  • Front Panel: Keypad selection of operating modes: Run, View, Test, Calibrate, Sensor Mapping

Sensor Range

  • Temperature: 0 o to 221oF (-15o to 105oC)
  • Humidity: 0-100% Relative Humidity
  • Combustible Gas: 5,000 ppm (10% LEL)
  • Carbon Monoxide: 100 ppm
  • Oxygen: 25% by volume
  • Hydrogen Sulfide: 100 ppm

Mechanical

  • Enclosure: NEMA 1 with hinged sensor cover panel
  • Mounting: Mounts on door of control panel
  • Dimensions: 8.75 x 11.25 x 2 in. (22.2 x 28.6 x 5.1 cm)
  • Weight: 3.2 lb. (1.9 Kg)

Inputs (Total Digital Inputs:17, Total Analog Inputs: 6)

  • Integral
    • Temperature
    • Humidity
    • Gas Sensors (4)
  • External (Terminals on 2490, controls in 2450)
    • Digital
      • Intrusion
      • Door Open
      • AC Failure
      • Smoke Alarm
      • Duct Sail Switch
      • High Water Alarm
      • Pump On Level Switch
      • Pump Off Level Switch
      • Spares (Qty. 9)
      • Analog (Optional sensors available)
      • External Temperature
      • Internal Temperature #1
      • Internal Temperature #2
      • External Relative Humidity
      • 0-10 VDC Spare
      • 4-20 mA DC Spare

Outputs (Total Control Relays: 14, Total Alarm Relays: 17)

  • Controls (Terminals on 2490, controls and relays in 2450)
    • SPST (Form A), 0.5 Amp, 60 VDC or 30 VRMS (AC), Normally open contacts
    • Air Conditioner #1
    • Air Conditioner #2
    • Air Damper
    • Blower #1
    • Blower #2
    • Condenser #1
    • Condenser #2
    • Dehumidifier
    • Heater
    • Sump Pump
    • Emergency Lights
    • Green Indicator
    • Red Indicator
  • Alarms (Relays on 2490 or in separate 2495 Alarm Connection Module, controls in 2450)
    • SPST (Form A), 0.5 Amp, 60 VDC, 30 VRMS (AC)
    • Pump Run
    • High Water
    • High Humidity
    • High Temperature
    • Vent Sail
    • Smoke
    • Combustible Gas
    • Carbon Monoxide
    • Oxygen
    • Hydrogen Sulfide
    • AC Power Fail
    • Intrusion
    • Malfunction
    • Gas Detection Trouble
    • Common Motor
    • Current Alarm Spare (2)

How to Purchase the Facility Environment Controller

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