6 Product description
The following section contains the product description of the 2250 control unit and a list of compatible devices.
6.1 MX addressable devices
The 2250 is compatible with the following different types of addressable devices:
1. Photoelectronic smoke sensor
2. Heat detector
3. Combination of photo and heat sensor
4. Triple (Combination of photo, heat and CO)
5. Isolator module
Refer to 579-1462 MX compatibility chart document for more details.
6.1.1 MX loop specifications
• The 2050 control unit can support up to 50 devices and addressable points for each loop and the 2250 control unit can support up to
250 devices and addressable points for each loop.
• You can wire the loop using Class A or Class B wiring.
• MX circuit load: 945 mA maximum.
• All wiring must be 18 AWG min. to 12 AWG max.
• Maximum loop length: 2 km (6561 ft.), with 18 AWG wire.
• Conductors must test free of all grounds and stray voltages before connection to appliances and control unit.
• All wiring is supervised and power-limited.
• Maximum supported channel capacitance: The sum of line-to-line capacitance, plus the capacitance of either line-to-shield (if shield is
present) = 0.6 μF.
• Resistance to compatible devices. (Include the 2081-9044 Overvoltage Protector resistance when applicable) = 50 ohms maximum.
• Earth detection threshold: 10 K ohms from either positive or negative terminals.
Note:
1. Installer must not use a double loop or redundant conductors or circuits to avoid electrical supervision does not meet the intent
of these requirements.
page 17 579-1404 Rev A
2050 and 2250 Foundation Series Fire Alarm Control Units Installation Guide
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